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extern:v1.1.2
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extern:v1.1.0
extern:v1.0.5
extern:v1.0.4
extern:v1.0.3
extern:v1.0.2
extern:v1.0.1
extern:v1.0.0
extern:v0.78.5
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extern:v0.78.3
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extern:v0.77.2
extern:v0.77.1
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extern:sshuttle-0.72
extern:sshuttle-0.71
extern:sshuttle-0.70
extern:sshuttle-0.61-macos-bin
extern:sshuttle-0.61
extern:sshuttle-0.60-macos-bin
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extern:sshuttle-0.54
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extern:sshuttle-0.50a
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extern:sshuttle-0.30
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extern:sshuttle-0.11
extern:sshuttle-0.10
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1
.envrc
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use flake .

13
.github/dependabot.yml vendored
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version: 2
enable-beta-ecosystems: true
updates:
- package-ecosystem: uv
directory: "/"
schedule:
interval: daily
open-pull-requests-limit: 10
- package-ecosystem: github-actions
directory: "/"
schedule:
interval: daily
open-pull-requests-limit: 10

70
.github/workflows/codeql.yml vendored
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@ -1,70 +0,0 @@
# For most projects, this workflow file will not need changing; you simply need
# to commit it to your repository.
#
# You may wish to alter this file to override the set of languages analyzed,
# or to provide custom queries or build logic.
#
# ******** NOTE ********
# We have attempted to detect the languages in your repository. Please check
# the `language` matrix defined below to confirm you have the correct set of
# supported CodeQL languages.
#
name: "CodeQL"
on:
push:
branches: [ master ]
pull_request:
# The branches below must be a subset of the branches above
branches: [ master ]
schedule:
- cron: '31 21 * * 3'
jobs:
analyze:
name: Analyze
runs-on: ubuntu-latest
permissions:
actions: read
contents: read
security-events: write
strategy:
fail-fast: false
matrix:
language: [ 'python' ]
# CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
# Learn more about CodeQL language support at https://git.io/codeql-language-support
steps:
- name: Checkout repository
uses: actions/checkout@v4
# Initializes the CodeQL tools for scanning.
- name: Initialize CodeQL
uses: github/codeql-action/init@v3
with:
languages: ${{ matrix.language }}
# If you wish to specify custom queries, you can do so here or in a config file.
# By default, queries listed here will override any specified in a config file.
# Prefix the list here with "+" to use these queries and those in the config file.
# queries: ./path/to/local/query, your-org/your-repo/queries@main
# Autobuild attempts to build any compiled languages (C/C++, C#, or Java).
# If this step fails, then you should remove it and run the build manually (see below)
- name: Autobuild
uses: github/codeql-action/autobuild@v3
# ℹ️ Command-line programs to run using the OS shell.
# 📚 https://git.io/JvXDl
# ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
# and modify them (or add more) to build your code if your project
# uses a compiled language
#- run: |
# make bootstrap
# make release
- name: Perform CodeQL Analysis
uses: github/codeql-action/analyze@v3

38
.github/workflows/pythonpackage.yml vendored
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@ -1,38 +0,0 @@
# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
name: Python package
on:
push:
branches: [ master ]
pull_request:
branches: [ master ]
workflow_dispatch: {}
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version: ["3.9", "3.10", "3.11", "3.12"]
poetry-version: ["main"]
steps:
- uses: actions/checkout@v4
- name: Set up Python ${{ matrix.python-version }}
uses: actions/setup-python@v5
with:
python-version: ${{ matrix.python-version }}
- name: Install uv
uses: astral-sh/setup-uv@v6
with:
version: "0.4.30"
enable-cache: true
cache-dependency-glob: "uv.lock"
- name: Install the project
run: uv sync --all-extras --dev
- name: Lint with flake8
run: uv run flake8 sshuttle tests --count --show-source --statistics
- name: Run the automated tests
run: uv run pytest -v

66
.github/workflows/release-please.yml vendored
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on:
push:
branches:
- master
name: release-please
jobs:
release-please:
runs-on: ubuntu-latest
permissions:
contents: write
pull-requests: write
outputs:
release_created: ${{ steps.release.outputs.release_created }}
tag_name: ${{ steps.release.outputs.tag_name }}
steps:
- uses: googleapis/release-please-action@v4
id: release
with:
token: ${{ secrets.MY_RELEASE_PLEASE_TOKEN }}
release-type: python
build-pypi:
name: Build for pypi
needs: [release-please]
if: ${{ needs.release-please.outputs.release_created == 'true' }}
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Set up Python 3.12
uses: actions/setup-python@v5
with:
python-version: 3.12
- name: Install uv
uses: astral-sh/setup-uv@v6
with:
version: "0.4.30"
enable-cache: true
cache-dependency-glob: "uv.lock"
- name: Build project
run: uv build
- name: Store the distribution packages
uses: actions/upload-artifact@v4
with:
name: python-package-distributions
path: dist/
upload-pypi:
name: Upload to pypi
needs: [build-pypi]
runs-on: ubuntu-latest
environment:
name: pypi
url: https://pypi.org/p/sshuttle
permissions:
id-token: write
steps:
- name: Download all the dists
uses: actions/download-artifact@v4
with:
name: python-package-distributions
path: dist/
- name: Publish package distributions to PyPI
uses: pypa/gh-action-pypi-publish@release/v1

14
.gitignore vendored
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/tmp/
/.coverage
/.cache/
/.eggs/
/.tox/
/build/
/dist/
/sshuttle.egg-info/
/docs/_build/
*.pyc
*~
*.8
/.do_built
/.do_built.dir
/.redo
/.pytest_cache/
/.python-version
/.direnv/
/result
/.vscode/

24
.prospector.yml
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strictness: medium
pylint:
disable:
- too-many-statements
- too-many-locals
- too-many-function-args
- too-many-arguments
- too-many-branches
- bare-except
- protected-access
- no-else-return
- unused-argument
- method-hidden
- arguments-differ
- wrong-import-position
- raising-bad-type
pep8:
options:
max-line-length: 79
mccabe:
run: false

13
.readthedocs.yaml
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version: 2
build:
os: ubuntu-20.04
tools:
python: "3.10"
jobs:
post_install:
- pip install uv
- UV_PROJECT_ENVIRONMENT=$READTHEDOCS_VIRTUALENV_PATH uv sync --all-extras --group docs --link-mode=copy
sphinx:
configuration: docs/conf.py

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.tool-versions
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python 3.10.6

54
CHANGELOG.md
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# Changelog
## [1.3.1](https://github.com/sshuttle/sshuttle/compare/v1.3.0...v1.3.1) (2025-03-25)
### Bug Fixes
* add pycodestyle config ([5942376](https://github.com/sshuttle/sshuttle/commit/5942376090395d0a8dfe38fe012a519268199341))
* add python lint tools ([ae3c022](https://github.com/sshuttle/sshuttle/commit/ae3c022d1d67de92f1c4712d06eb8ae76c970624))
* correct bad version number at runtime ([7b66253](https://github.com/sshuttle/sshuttle/commit/7b662536ba92d724ed8f86a32a21282fea66047c))
* Restore "nft" method ([375810a](https://github.com/sshuttle/sshuttle/commit/375810a9a8910a51db22c9fe4c0658c39b16c9e7))
## [1.3.0](https://github.com/sshuttle/sshuttle/compare/v1.2.0...v1.3.0) (2025-02-23)
### Features
* switch to a network namespace on Linux ([8a123d9](https://github.com/sshuttle/sshuttle/commit/8a123d9762b84f168a8ca8c75f73e590954e122d))
### Bug Fixes
* prevent UnicodeDecodeError parsing iptables rule with comments ([cbe3d1e](https://github.com/sshuttle/sshuttle/commit/cbe3d1e402cac9d3fbc818fe0cb8a87be2e94348))
* remove temp build hack ([1f5e6ce](https://github.com/sshuttle/sshuttle/commit/1f5e6cea703db33761fb1c3f999b9624cf3bc7ad))
* support ':' sign in password ([7fa927e](https://github.com/sshuttle/sshuttle/commit/7fa927ef8ceea6b1b2848ca433b8b3e3b63f0509))
### Documentation
* replace nix-env with nix-shell ([340ccc7](https://github.com/sshuttle/sshuttle/commit/340ccc705ebd9499f14f799fcef0b5d2a8055fb4))
* update installation instructions ([a2d405a](https://github.com/sshuttle/sshuttle/commit/a2d405a6a7f9d1a301311a109f8411f2fe8deb37))
## [1.2.0](https://github.com/sshuttle/sshuttle/compare/v1.1.2...v1.2.0) (2025-02-07)
### Features
* Add release-please to build workflow ([d910b64](https://github.com/sshuttle/sshuttle/commit/d910b64be77fd7ef2a5f169b780bfda95e67318d))
### Bug Fixes
* Add support for Python 3.11 and Python 3.11 ([a3396a4](https://github.com/sshuttle/sshuttle/commit/a3396a443df14d3bafc3d25909d9221aa182b8fc))
* bad file descriptor error in windows, fix pytest errors ([d4d0fa9](https://github.com/sshuttle/sshuttle/commit/d4d0fa945d50606360aa7c5f026a0f190b026c68))
* drop Python 3.8 support ([1084c0f](https://github.com/sshuttle/sshuttle/commit/1084c0f2458c1595b00963b3bd54bd667e4cfc9f))
* ensure poetry works for Python 3.9 ([693ee40](https://github.com/sshuttle/sshuttle/commit/693ee40c485c70f353326eb0e8f721f984850f5c))
* fix broken workflow_dispatch CI rule ([4b6f7c6](https://github.com/sshuttle/sshuttle/commit/4b6f7c6a656a752552295863092d3b8af0b42b31))
* Remove more references to legacy Python versions ([339b522](https://github.com/sshuttle/sshuttle/commit/339b5221bc33254329f79f2374f6114be6f30aed))
* replace requirements.txt files with poetry ([85dc319](https://github.com/sshuttle/sshuttle/commit/85dc3199a332f9f9f0e4c6037c883a8f88dc09ca))
* replace requirements.txt files with poetry (2) ([d08f78a](https://github.com/sshuttle/sshuttle/commit/d08f78a2d9777951d7e18f6eaebbcdd279d7683a))
* replace requirements.txt files with poetry (3) ([62da705](https://github.com/sshuttle/sshuttle/commit/62da70510e8a1f93e8b38870fdebdbace965cd8e))
* replace requirements.txt files with poetry (4) ([9bcedf1](https://github.com/sshuttle/sshuttle/commit/9bcedf19049e5b3a8ae26818299cc518ec03a926))
* update nix flake to fix problems ([cda60a5](https://github.com/sshuttle/sshuttle/commit/cda60a52331c7102cff892b9b77c8321e276680a))
* use Python >= 3.10 for docs ([bf29464](https://github.com/sshuttle/sshuttle/commit/bf294643e283cef9fb285d44e307e958686caf46))

315
CHANGES.rst
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==========
Change log
==========
Release notes now moved to https://github.com/sshuttle/sshuttle/releases/
These are the old release notes.
1.0.5 - 2020-12-29
------------------
Added
~~~~~
* IPv6 support in nft method.
* Intercept DNS requests sent by systemd-resolved.
* Set default tmark.
* Fix python2 server compatibility.
* Python 3.9 support.
Fixed
~~~~~
* Change license text to LGPL-2.1
* Fix #494 sshuttle caught in infinite select() loop.
* Include sshuttle version in verbose output.
* Add psutil as dependency in setup.py
* When subnets and excludes are specified with hostnames, use all IPs.
* Update/document client's handling of IPv4 and IPv6.
* Update sdnotify.py documentation.
* Allow no remote to work.
* Make prefixes in verbose output more consistent.
* Make nat and nft rules consistent; improve rule ordering.
* Make server and client handle resolv.conf differently.
* Fix handling OSError in FirewallClient#__init__
* Refactor automatic method selection.
Removed
~~~~~~~
* Drop testing of Python 3.5
1.0.4 - 2020-08-24
------------------
Fixed
~~~~~
* Allow Mux() flush/fill to work with python < 3.5
* Fix parse_hostport to always return string for host.
* Require -r/--remote parameter.
* Add missing package in OpenWRT documentation.
* Fix doc about --listen option.
* README: add Ubuntu.
* Increase IP4 ttl to 63 hops instead of 42.
* Fix formatting in installation.rst
1.0.3 - 2020-07-12
------------------
Fixed
~~~~~
* Ask setuptools to require Python 3.5 and above.
* Add missing import.
* Fix formatting typos in usage docs
1.0.2 - 2020-06-18
------------------
Fixed
~~~~~
* Leave use of default port to ssh command.
* Remove unwanted references to Python 2.7 in docs.
* Replace usage of deprecated imp.
* Fix connection with @ sign in username.
1.0.1 - 2020-06-05
------------------
Fixed
~~~~~
* Errors in python long_documentation.
1.0.0 - 2020-06-05
------------------
Added
~~~~~
* Python 3.8 support.
* sshpass support.
* Auto sudoers file (#269).
* option for latency control buffer size.
* Docs: FreeBSD'.
* Docs: Nix'.
* Docs: openwrt'.
* Docs: install instructions for Fedora'.
* Docs: install instructions for Arch Linux'.
* Docs: 'My VPN broke and need a solution fast'.
Removed
~~~~~~~
* Python 2.6 support.
* Python 2.7 support.
Fixed
~~~~~
* Remove debug message for getpeername failure.
* Fix crash triggered by port scans closing socket.
* Added "Running as a service" to docs.
* Systemd integration.
* Trap UnicodeError to handle cases where hostnames returned by DNS are invalid.
* Formatting error in CHANGES.rst
* Various errors in documentation.
* Nftables based method.
* Make hostwatch locale-independent (#379).
* Add tproxy udp port mark filter that was missed in #144, fixes #367.
* Capturing of local DNS servers.
* Crashing on ECONNABORTED.
* Size of pf_rule, which grew in OpenBSD 6.4.
* Use prompt for sudo, not needed for doas.
* Arch linux installation instructions.
* tests for existing PR-312 (#337).
* Hyphen in hostname.
* Assembler import (#319).
0.78.5 - 2019-01-28
-------------------
Added
~~~~~
* doas support as replacement for sudo on OpenBSD.
* Added ChromeOS section to documentation (#262)
* Add --no-sudo-pythonpath option
Fixed
~~~~~
* Fix forwarding to a single port.
* Various updates to documentation.
* Don't crash if we can't look up peername
* Fix missing string formatting argument
* Moved sshuttle/tests into tests.
* Updated bandit config.
* Replace path /dev/null by os.devnull.
* Added coverage report to tests.
* Fixes support for OpenBSD (6.1+) (#282).
* Close stdin, stdout, and stderr when using syslog or forking to daemon (#283).
* Changes pf exclusion rules precedence.
* Fix deadlock with iptables with large ruleset.
* docs: document --ns-hosts --to-ns and update --dns.
* Use subprocess.check_output instead of run.
* Fix potential deadlock condition in nft_get_handle.
* auto-nets: retrieve routes only if using auto-nets.
0.78.4 - 2018-04-02
-------------------
Added
~~~~~
* Add homebrew instructions.
* Route traffic by linux user.
* Add nat-like method using nftables instead of iptables.
Changed
~~~~~~~
* Talk to custom DNS server on pod, instead of the ones in /etc/resolv.conf.
* Add new option for overriding destination DNS server.
* Changed subnet parsing. Previously 10/8 become 10.0.0.0/8. Now it gets
parsed as 0.0.0.10/8.
* Make hostwatch find both fqdn and hostname.
* Use versions of python3 greater than 3.5 when available (e.g. 3.6).
Removed
~~~~~~~
* Remove Python 2.6 from automatic tests.
Fixed
~~~~~
* Fix case where there is no --dns.
* [pf] Avoid port forwarding from loopback address.
* Use getaddrinfo to obtain a correct sockaddr.
* Skip empty lines on incoming routes data.
* Just skip empty lines of routes data instead of stopping processing.
* [pf] Load pf kernel module when enabling pf.
* [pf] Test double restore (ipv4, ipv6) disables only once; test kldload.
* Fixes UDP and DNS proxies binding to the same socket address.
* Mock socket bind to avoid depending on local IPs being available in test box.
* Fix no value passed for argument auto_hosts in hw_main call.
* Fixed incorrect license information in setup.py.
* Preserve peer and port properly.
* Make --to-dns and --ns-host work well together.
* Remove test that fails under OSX.
* Specify pip requirements for tests.
* Use flake8 to find Python syntax errors or undefined names.
* Fix compatibility with the sudoers file.
* Stop using SO_REUSEADDR on sockets.
* Declare 'verbosity' as global variable to placate linters.
* Adds 'cd sshuttle' after 'git' to README and docs.
* Documentation for loading options from configuration file.
* Load options from a file.
* Fix firewall.py.
* Move sdnotify after setting up firewall rules.
* Fix tests on Macos.
0.78.3 - 2017-07-09
-------------------
The "I should have done a git pull" first release.
Fixed
~~~~~
* Order first by port range and only then by swidth
0.78.2 - 2017-07-09
-------------------
Added
~~~~~
* Adds support for tunneling specific port ranges (#144).
* Add support for iproute2.
* Allow remote hosts with colons in the username.
* Re-introduce ipfw support for sshuttle on FreeBSD with support for --DNS option as well.
* Add support for PfSense.
* Tests and documentation for systemd integration.
* Allow subnets to be given only by file (-s).
Fixed
~~~~~
* Work around non tabular headers in BSD netstat.
* Fix UDP and DNS support on Python 2.7 with tproxy method.
* Fixed tests after adding support for iproute2.
* Small refactoring of netstat/iproute parsing.
* Set started_by_sshuttle False after disabling pf.
* Fix punctuation and explain Type=notify.
* Move pytest-runner to tests_require.
* Fix warning: closed channel got=STOP_SENDING.
* Support sdnotify for better systemd integration.
* Fix #117 to allow for no subnets via file (-s).
* Fix argument splitting for multi-word arguments.
* requirements.rst: Fix mistakes.
* Fix typo, space not required here.
* Update installation instructions.
* Support using run from different directory.
* Ensure we update sshuttle/version.py in run.
* Don't print python version in run.
* Add CWD to PYTHONPATH in run.
0.78.1 - 2016-08-06
-------------------
* Fix readthedocs versioning.
* Don't crash on ENETUNREACH.
* Various bug fixes.
* Improvements to BSD and OSX support.
0.78.0 - 2016-04-08
-------------------
* Don't force IPv6 if IPv6 nameservers supplied. Fixes #74.
* Call /bin/sh as users shell may not be POSIX compliant. Fixes #77.
* Use argparse for command line processing. Fixes #75.
* Remove useless --server option.
* Support multiple -s (subnet) options. Fixes #86.
* Make server parts work with old versions of Python. Fixes #81.
0.77.2 - 2016-03-07
-------------------
* Accidentally switched LGPL2 license with GPL2 license in 0.77.1 - now fixed.
0.77.1 - 2016-03-07
-------------------
* Use semantic versioning. http://semver.org/
* Update GPL 2 license text.
* New release to fix PyPI.
0.77 - 2016-03-03
-----------------
* Various bug fixes.
* Fix Documentation.
* Add fix for MacOS X issue.
* Add support for OpenBSD.
0.76 - 2016-01-17
-----------------
* Add option to disable IPv6 support.
* Update documentation.
* Move documentation, including man page, to Sphinx.
* Use setuptools-scm for automatic versioning.
0.75 - 2016-01-12
-----------------
* Revert change that broke sshuttle entry point.
0.74 - 2016-01-10
-----------------
* Add CHANGES.rst file.
* Numerous bug fixes.
* Python 3.5 fixes.
* PF fixes, especially for BSD.

207
LICENSE
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@ -1,125 +1,112 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
GNU LIBRARY GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Copyright (C) 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts
as the successor of the GNU Library Public License, version 2, hence
the version number 2.1.]
[This is the first released version of the library GPL. It is
numbered 2 because it goes with version 2 of the ordinary GPL.]
Preamble
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
Licenses are intended to guarantee your freedom to share and change
free software--to make sure the software is free for all its users.
This license, the Lesser General Public License, applies to some
specially designated software packages--typically libraries--of the
Free Software Foundation and other authors who decide to use it. You
can use it too, but we suggest you first think carefully about whether
this license or the ordinary General Public License is the better
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former contains code derived from the library, while the latter only
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Note that it is possible for a library to be covered by the ordinary
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GNU LESSER GENERAL PUBLIC LICENSE
GNU LIBRARY GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License Agreement applies to any software library or other
program which contains a notice placed by the copyright holder or
other authorized party saying it may be distributed under the terms of
this Lesser General Public License (also called "this License").
Each licensee is addressed as "you".
0. This License Agreement applies to any software library which
contains a notice placed by the copyright holder or other authorized
party saying it may be distributed under the terms of this Library
General Public License (also called "this License"). Each licensee is
addressed as "you".
A "library" means a collection of software functions and/or data
prepared so as to be conveniently linked with application programs
@ -146,7 +133,7 @@ such a program is covered only if its contents constitute a work based
on the Library (independent of the use of the Library in a tool for
writing it). Whether that is true depends on what the Library does
and what the program that uses the Library does.
1. You may copy and distribute verbatim copies of the Library's
complete source code as you receive it, in any medium, provided that
you conspicuously and appropriately publish on each copy an
@ -268,7 +255,7 @@ distribute the object code for the work under the terms of Section 6.
Any executables containing that work also fall under Section 6,
whether or not they are linked directly with the Library itself.
6. As an exception to the Sections above, you may also combine or
6. As an exception to the Sections above, you may also compile or
link a "work that uses the Library" with the Library to produce a
work containing portions of the Library, and distribute that work
under terms of your choice, provided that the terms permit
@ -295,31 +282,23 @@ of these things:
Library will not necessarily be able to recompile the application
to use the modified definitions.)
b) Use a suitable shared library mechanism for linking with the
Library. A suitable mechanism is one that (1) uses at run time a
copy of the library already present on the user's computer system,
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c) Accompany the work with a written offer, valid for at
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the source code distributed need not include anything that is normally
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@ -368,7 +347,7 @@ Library), the recipient automatically receives a license from the
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You are not responsible for enforcing compliance by third parties with
You are not responsible for enforcing compliance by third parties to
this License.
11. If, as a consequence of a court judgment or allegation of patent
@ -411,7 +390,7 @@ excluded. In such case, this License incorporates the limitation as if
written in the body of this License.
13. The Free Software Foundation may publish revised and/or new
versions of the Lesser General Public License from time to time.
versions of the Library General Public License from time to time.
Such new versions will be similar in spirit to the present version,
but may differ in detail to address new problems or concerns.
@ -432,7 +411,7 @@ decision will be guided by the two goals of preserving the free status
of all derivatives of our free software and of promoting the sharing
and reuse of software generally.
NO WARRANTY
NO WARRANTY
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
@ -455,9 +434,9 @@ FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
END OF TERMS AND CONDITIONS
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Libraries
Appendix: How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
@ -474,18 +453,18 @@ convey the exclusion of warranty; and each file should have at least the
Copyright (C) <year> <name of author>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Also add information on how to contact you by electronic and paper mail.

14
MANIFEST.in
View File

@ -1,14 +0,0 @@
include *.txt
include *.rst
include *.py
include MANIFEST.in
include LICENSE
include run
include tox.ini
exclude sshuttle/version.py
recursive-include docs *.bat
recursive-include docs *.py
recursive-include docs *.rst
recursive-include docs Makefile
recursive-include sshuttle *.py
recursive-exclude docs/_build *

221
README.md Normal file
View File

@ -0,0 +1,221 @@
WARNING:
On MacOS 10.6 (at least up to 10.6.6), your network will
stop responding about 10 minutes after the first time you
start sshuttle, because of a MacOS kernel bug relating to
arp and the net.inet.ip.scopedroute sysctl. To fix it,
just switch your wireless off and on. Sshuttle makes the
kernel setting it changes permanent, so this won't happen
again, even after a reboot.
Required Software
=================
- You need PyXAPI, available here:
http://www.pps.univ-paris-diderot.fr/~ylg/PyXAPI/
- Python 2.x, both locally and the remote system
Additional Suggested Software
-----------------------------
- You may want to need autossh, available in various package management
systems
sshuttle: where transparent proxy meets VPN meets ssh
=====================================================
As far as I know, sshuttle is the only program that solves the following
common case:
- Your client machine (or router) is Linux, FreeBSD, or MacOS.
- You have access to a remote network via ssh.
- You don't necessarily have admin access on the remote network.
- The remote network has no VPN, or only stupid/complex VPN
protocols (IPsec, PPTP, etc). Or maybe you <i>are</i> the
admin and you just got frustrated with the awful state of
VPN tools.
- You don't want to create an ssh port forward for every
single host/port on the remote network.
- You hate openssh's port forwarding because it's randomly
slow and/or stupid.
- You can't use openssh's PermitTunnel feature because
it's disabled by default on openssh servers; plus it does
TCP-over-TCP, which has terrible performance (see below).
Prerequisites
-------------
- sudo, su, or logged in as root on your client machine.
(The server doesn't need admin access.)
- If you use Linux on your client machine:
iptables installed on the client, including at
least the iptables DNAT, REDIRECT, and ttl modules.
These are installed by default on most Linux distributions.
(The server doesn't need iptables and doesn't need to be
Linux.)
- If you use MacOS or BSD on your client machine:
Your kernel needs to be compiled with `IPFIREWALL_FORWARD`
(MacOS has this by default) and you need to have ipfw
available. (The server doesn't need to be MacOS or BSD.)
Obtaining sshuttle
------------------
- First, go get PyXAPI from the link above
- Clone: `git clone https://github.com/sshuttle/sshuttle.git`
Usage on (Ubuntu) Linux
-----------------------
- `cd packaging; ./make_deb`
- `sudo dpkg -i ./sshuttle-VERSION.deb`
- Check out the files in `/etc/sshuttle`; configure them so your tunnel works
- `sudo service sshuttle start`
Usage on other Linuxes and OSes
-------------------------------
<tt>src/sshuttle -r username@sshserver 0.0.0.0/0 -vv</tt>
- There is a shortcut for 0.0.0.0/0 for those that value
their wrists
<tt>src/sshuttle -r username@sshserver 0/0 -vv</tt>
- If you would also like your DNS queries to be proxied
through the DNS server of the server you are connect to:
<tt>src/sshuttle --dns -vvr username@sshserver 0/0</tt>
The above is probably what you want to use to prevent
local network attacks such as Firesheep and friends.
(You may be prompted for one or more passwords; first, the
local password to become root using either sudo or su, and
then the remote ssh password. Or you might have sudo and ssh set
up to not require passwords, in which case you won't be
prompted at all.)
Usage Notes
-----------
That's it! Now your local machine can access the remote network as if you
were right there. And if your "client" machine is a router, everyone on
your local network can make connections to your remote network.
You don't need to install sshuttle on the remote server;
the remote server just needs to have python available.
sshuttle will automatically upload and run its source code
to the remote python interpreter.
This creates a transparent proxy server on your local machine for all IP
addresses that match 0.0.0.0/0. (You can use more specific IP addresses if
you want; use any number of IP addresses or subnets to change which
addresses get proxied. Using 0.0.0.0/0 proxies <i>everything</i>, which is
interesting if you don't trust the people on your local network.)
Any TCP session you initiate to one of the proxied IP addresses will be
captured by sshuttle and sent over an ssh session to the remote copy of
sshuttle, which will then regenerate the connection on that end, and funnel
the data back and forth through ssh.
Fun, right? A poor man's instant VPN, and you don't even have to have
admin access on the server.
Theory of Operation
-------------------
sshuttle is not exactly a VPN, and not exactly port forwarding. It's kind
of both, and kind of neither.
It's like a VPN, since it can forward every port on an entire network, not
just ports you specify. Conveniently, it lets you use the "real" IP
addresses of each host rather than faking port numbers on localhost.
On the other hand, the way it *works* is more like ssh port forwarding than
a VPN. Normally, a VPN forwards your data one packet at a time, and
doesn't care about individual connections; ie. it's "stateless" with respect
to the traffic. sshuttle is the opposite of stateless; it tracks every
single connection.
You could compare sshuttle to something like the old <a
href="http://en.wikipedia.org/wiki/Slirp">Slirp</a> program, which was a
userspace TCP/IP implementation that did something similar. But it
operated on a packet-by-packet basis on the client side, reassembling the
packets on the server side. That worked okay back in the "real live serial
port" days, because serial ports had predictable latency and buffering.
But you can't safely just forward TCP packets over a TCP session (like ssh),
because TCP's performance depends fundamentally on packet loss; it
<i>must</i> experience packet loss in order to know when to slow down! At
the same time, the outer TCP session (ssh, in this case) is a reliable
transport, which means that what you forward through the tunnel <i>never</i>
experiences packet loss. The ssh session itself experiences packet loss, of
course, but TCP fixes it up and ssh (and thus you) never know the
difference. But neither does your inner TCP session, and extremely screwy
performance ensues.
sshuttle assembles the TCP stream locally, multiplexes it statefully over
an ssh session, and disassembles it back into packets at the other end. So
it never ends up doing TCP-over-TCP. It's just data-over-TCP, which is
safe.
Useless Trivia
--------------
Back in 1998 (12 years ago! Yikes!), I released the first version of <a
href="http://alumnit.ca/wiki/?TunnelVisionReadMe">Tunnel Vision</a>, a
semi-intelligent VPN client for Linux. Unfortunately, I made two big mistakes:
I implemented the key exchange myself (oops), and I ended up doing
TCP-over-TCP (double oops). The resulting program worked okay - and people
used it for years - but the performance was always a bit funny. And nobody
ever found any security flaws in my key exchange, either, but that doesn't
mean anything. :)
The same year, dcoombs and I also released Fast Forward, a proxy server
supporting transparent proxying. Among other things, we used it for
automatically splitting traffic across more than one Internet connection (a
tool we called "Double Vision").
I was still in university at the time. A couple years after that, one of my
professors was working with some graduate students on the technology that
would eventually become <a href="http://www.slipstream.com/">Slipstream
Internet Acceleration</a>. He asked me to do a contract for him to build an
initial prototype of a transparent proxy server for mobile networks. The
idea was similar to sshuttle: if you reassemble and then disassemble the TCP
packets, you can reduce latency and improve performance vs. just forwarding
the packets over a plain VPN or mobile network. (It's unlikely that any of
my code has persisted in the Slipstream product today, but the concept is
still pretty cool. I'm still horrified that people use plain TCP on
complex mobile networks with crazily variable latency, for which it was
never really intended.)
That project I did for Slipstream was what first gave me the idea to merge
the concepts of Fast Forward, Double Vision, and Tunnel Vision into a single
program that was the best of all worlds. And here we are, at last, 10 years
later. You're welcome.
--
Avery Pennarun <apenwarr@gmail.com>
Mailing list:
Subscribe by sending a message to <sshuttle+subscribe@googlegroups.com>
List archives are at: http://groups.google.com/group/sshuttle

49
README.rst
View File

@ -1,49 +0,0 @@
sshuttle: where transparent proxy meets VPN meets ssh
=====================================================
As far as I know, sshuttle is the only program that solves the following
common case:
- Your client machine (or router) is Linux, FreeBSD, MacOS or Windows.
- You have access to a remote network via ssh.
- You don't necessarily have admin access on the remote network.
- The remote network has no VPN, or only stupid/complex VPN
protocols (IPsec, PPTP, etc). Or maybe you *are* the
admin and you just got frustrated with the awful state of
VPN tools.
- You don't want to create an ssh port forward for every
single host/port on the remote network.
- You hate openssh's port forwarding because it's randomly
slow and/or stupid.
- You can't use openssh's PermitTunnel feature because
it's disabled by default on openssh servers; plus it does
TCP-over-TCP, which has `terrible performance`_.
.. _terrible performance: https://sshuttle.readthedocs.io/en/stable/how-it-works.html
Obtaining sshuttle
------------------
Please see the documentation_.
.. _Documentation: https://sshuttle.readthedocs.io/en/stable/installation.html
Documentation
-------------
The documentation for the stable version is available at:
https://sshuttle.readthedocs.org/
The documentation for the latest development version is available at:
https://sshuttle.readthedocs.org/en/latest/
Running as a service
--------------------
Sshuttle can also be run as a service and configured using a config management system:
https://medium.com/@mike.reider/using-sshuttle-as-a-service-bec2684a65fe

9
bandit.yml
View File

@ -1,9 +0,0 @@
exclude_dirs:
- tests
skips:
- B101
- B104
- B404
- B603
- B606
- B607

177
docs/Makefile
View File

@ -1,177 +0,0 @@
# Makefile for Sphinx documentation
#
# You can set these variables from the command line.
SPHINXOPTS =
SPHINXBUILD = sphinx-build
PAPER =
BUILDDIR = _build
# User-friendly check for sphinx-build
ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
endif
# Internal variables.
PAPEROPT_a4 = -D latex_paper_size=a4
PAPEROPT_letter = -D latex_paper_size=letter
ALLSPHINXOPTS = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
# the i18n builder cannot share the environment and doctrees with the others
I18NSPHINXOPTS = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
help:
@echo "Please use \`make <target>' where <target> is one of"
@echo " html to make standalone HTML files"
@echo " dirhtml to make HTML files named index.html in directories"
@echo " singlehtml to make a single large HTML file"
@echo " pickle to make pickle files"
@echo " json to make JSON files"
@echo " htmlhelp to make HTML files and a HTML help project"
@echo " qthelp to make HTML files and a qthelp project"
@echo " devhelp to make HTML files and a Devhelp project"
@echo " epub to make an epub"
@echo " latex to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
@echo " latexpdf to make LaTeX files and run them through pdflatex"
@echo " latexpdfja to make LaTeX files and run them through platex/dvipdfmx"
@echo " text to make text files"
@echo " man to make manual pages"
@echo " texinfo to make Texinfo files"
@echo " info to make Texinfo files and run them through makeinfo"
@echo " gettext to make PO message catalogs"
@echo " changes to make an overview of all changed/added/deprecated items"
@echo " xml to make Docutils-native XML files"
@echo " pseudoxml to make pseudoxml-XML files for display purposes"
@echo " linkcheck to check all external links for integrity"
@echo " doctest to run all doctests embedded in the documentation (if enabled)"
clean:
rm -rf $(BUILDDIR)/*
html:
$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
@echo
@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
dirhtml:
$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
@echo
@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
singlehtml:
$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
@echo
@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
pickle:
$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
@echo
@echo "Build finished; now you can process the pickle files."
json:
$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
@echo
@echo "Build finished; now you can process the JSON files."
htmlhelp:
$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
@echo
@echo "Build finished; now you can run HTML Help Workshop with the" \
".hhp project file in $(BUILDDIR)/htmlhelp."
qthelp:
$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
@echo
@echo "Build finished; now you can run "qcollectiongenerator" with the" \
".qhcp project file in $(BUILDDIR)/qthelp, like this:"
@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/sshuttle.qhcp"
@echo "To view the help file:"
@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/sshuttle.qhc"
devhelp:
$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
@echo
@echo "Build finished."
@echo "To view the help file:"
@echo "# mkdir -p $$HOME/.local/share/devhelp/sshuttle"
@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/sshuttle"
@echo "# devhelp"
epub:
$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
@echo
@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
latex:
$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
@echo
@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
@echo "Run \`make' in that directory to run these through (pdf)latex" \
"(use \`make latexpdf' here to do that automatically)."
latexpdf:
$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
@echo "Running LaTeX files through pdflatex..."
$(MAKE) -C $(BUILDDIR)/latex all-pdf
@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
latexpdfja:
$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
@echo "Running LaTeX files through platex and dvipdfmx..."
$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
text:
$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
@echo
@echo "Build finished. The text files are in $(BUILDDIR)/text."
man:
$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
@echo
@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
texinfo:
$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
@echo
@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
@echo "Run \`make' in that directory to run these through makeinfo" \
"(use \`make info' here to do that automatically)."
info:
$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
@echo "Running Texinfo files through makeinfo..."
make -C $(BUILDDIR)/texinfo info
@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
gettext:
$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
@echo
@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
changes:
$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
@echo
@echo "The overview file is in $(BUILDDIR)/changes."
linkcheck:
$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
@echo
@echo "Link check complete; look for any errors in the above output " \
"or in $(BUILDDIR)/linkcheck/output.txt."
doctest:
$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
@echo "Testing of doctests in the sources finished, look at the " \
"results in $(BUILDDIR)/doctest/output.txt."
xml:
$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
@echo
@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
pseudoxml:
$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
@echo
@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."

1
docs/changes.rst
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@ -1 +0,0 @@
.. include:: ../CHANGES.rst

11
docs/chromeos.rst
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@ -1,11 +0,0 @@
Google ChromeOS
===============
Currently there is no built in support for running sshuttle directly on
Google ChromeOS/Chromebooks.
What we can really do is to create a Linux VM with Crostini. In the default
stretch/Debian 9 VM, you can then install sshuttle as on any Linux box and
it just works, as do xterms and ssvncviewer etc.
https://www.reddit.com/r/Crostini/wiki/getstarted/crostini-setup-guide

261
docs/conf.py
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@ -1,261 +0,0 @@
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# sshuttle documentation build configuration file, created by
# sphinx-quickstart on Sun Jan 17 12:13:47 2016.
#
# This file is execfile()d with the current directory set to its
# containing dir.
#
# Note that not all possible configuration values are present in this
# autogenerated file.
#
# All configuration values have a default; values that are commented out
# serve to show the default.
import sys
import os
sys.path.insert(0, os.path.abspath('..'))
import sshuttle # NOQA
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
# sys.path.insert(0, os.path.abspath('.'))
# -- General configuration ------------------------------------------------
# If your documentation needs a minimal Sphinx version, state it here.
# needs_sphinx = '1.0'
# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = [
'sphinx.ext.todo',
]
# Add any paths that contain templates here, relative to this directory.
templates_path = ['_templates']
# The suffix of source filenames.
source_suffix = '.rst'
# The encoding of source files.
# source_encoding = 'utf-8-sig'
# The master toctree document.
master_doc = 'index'
# General information about the project.
project = 'sshuttle'
copyright = '2016, Brian May'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The full version, including alpha/beta/rc tags.
release = sshuttle.__version__
# The short X.Y version.
version = '.'.join(release.split('.')[:2])
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
# language = None
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
# today = ''
# Else, today_fmt is used as the format for a strftime call.
# today_fmt = '%B %d, %Y'
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
exclude_patterns = ['_build']
# The reST default role (used for this markup: `text`) to use for all
# documents.
# default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
# add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
# add_module_names = True
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
# show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'sphinx'
# A list of ignored prefixes for module index sorting.
# modindex_common_prefix = []
# If true, keep warnings as "system message" paragraphs in the built documents.
# keep_warnings = False
# -- Options for HTML output ----------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
html_theme = 'furo'
# Theme options are theme-specific and customize the look and feel of a theme
# further. For a list of options available for each theme, see the
# documentation.
# html_theme_options = {}
# Add any paths that contain custom themes here, relative to this directory.
# html_theme_path = []
# The name for this set of Sphinx documents. If None, it defaults to
# "<project> v<release> documentation".
# html_title = None
# A shorter title for the navigation bar. Default is the same as html_title.
# html_short_title = None
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
# html_logo = None
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
# html_favicon = None
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ['_static']
# Add any extra paths that contain custom files (such as robots.txt or
# .htaccess) here, relative to this directory. These files are copied
# directly to the root of the documentation.
# html_extra_path = []
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
# html_last_updated_fmt = '%b %d, %Y'
# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
# html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
# html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
# html_additional_pages = {}
# If false, no module index is generated.
# html_domain_indices = True
# If false, no index is generated.
# html_use_index = True
# If true, the index is split into individual pages for each letter.
# html_split_index = False
# If true, links to the reST sources are added to the pages.
# html_show_sourcelink = True
# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
# html_show_sphinx = True
# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
# html_show_copyright = True
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
# html_use_opensearch = ''
# This is the file name suffix for HTML files (e.g. ".xhtml").
# html_file_suffix = None
# Output file base name for HTML help builder.
htmlhelp_basename = 'sshuttledoc'
# -- Options for LaTeX output ---------------------------------------------
latex_elements = {
# The paper size ('letterpaper' or 'a4paper').
# 'papersize': 'letterpaper',
# The font size ('10pt', '11pt' or '12pt').
# 'pointsize': '10pt',
# Additional stuff for the LaTeX preamble.
# 'preamble': '',
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
# author, documentclass [howto, manual, or own class]).
latex_documents = [
('index', 'sshuttle.tex', 'sshuttle documentation', 'Brian May', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
# latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
# latex_use_parts = False
# If true, show page references after internal links.
# latex_show_pagerefs = False
# If true, show URL addresses after external links.
# latex_show_urls = False
# Documents to append as an appendix to all manuals.
# latex_appendices = []
# If false, no module index is generated.
# latex_domain_indices = True
# -- Options for manual page output ---------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
('manpage', 'sshuttle', 'sshuttle documentation', ['Brian May'], 1)
]
# If true, show URL addresses after external links.
# man_show_urls = False
# -- Options for Texinfo output -------------------------------------------
# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
# dir menu entry, description, category)
texinfo_documents = [
('index', 'sshuttle', 'sshuttle documentation',
'Brian May', 'sshuttle', 'A transparent proxy-based VPN using ssh',
'Miscellaneous'),
]
# Documents to append as an appendix to all manuals.
# texinfo_appendices = []
# If false, no module index is generated.
# texinfo_domain_indices = True
# How to display URL addresses: 'footnote', 'no', or 'inline'.
# texinfo_show_urls = 'footnote'
# If true, do not generate a @detailmenu in the "Top" node's menu.
# texinfo_no_detailmenu = False

36
docs/how-it-works.rst
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@ -1,36 +0,0 @@
How it works
============
sshuttle is not exactly a VPN, and not exactly port forwarding. It's kind
of both, and kind of neither.
It's like a VPN, since it can forward every port on an entire network, not
just ports you specify. Conveniently, it lets you use the "real" IP
addresses of each host rather than faking port numbers on localhost.
On the other hand, the way it *works* is more like ssh port forwarding than
a VPN. Normally, a VPN forwards your data one packet at a time, and
doesn't care about individual connections; ie. it's "stateless" with respect
to the traffic. sshuttle is the opposite of stateless; it tracks every
single connection.
You could compare sshuttle to something like the old `Slirp
<http://en.wikipedia.org/wiki/Slirp>`_ program, which was a userspace TCP/IP
implementation that did something similar. But it operated on a
packet-by-packet basis on the client side, reassembling the packets on the
server side. That worked okay back in the "real live serial port" days,
because serial ports had predictable latency and buffering.
But you can't safely just forward TCP packets over a TCP session (like ssh),
because TCP's performance depends fundamentally on packet loss; it
*must* experience packet loss in order to know when to slow down! At
the same time, the outer TCP session (ssh, in this case) is a reliable
transport, which means that what you forward through the tunnel *never*
experiences packet loss. The ssh session itself experiences packet loss, of
course, but TCP fixes it up and ssh (and thus you) never know the
difference. But neither does your inner TCP session, and extremely screwy
performance ensues.
sshuttle assembles the TCP stream locally, multiplexes it statefully over
an ssh session, and disassembles it back into packets at the other end. So
it never ends up doing TCP-over-TCP. It's just data-over-TCP, which is
safe.

28
docs/index.rst
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@ -1,28 +0,0 @@
sshuttle: where transparent proxy meets VPN meets ssh
=====================================================
:Date: |today|
:Version: |version|
Contents:
.. toctree::
:maxdepth: 2
overview
requirements
installation
usage
platform
Man Page <manpage>
how-it-works
support
trivia
changes
Indices and tables
==================
* :ref:`genindex`
* :ref:`search`

84
docs/installation.rst
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@ -1,84 +0,0 @@
Installation
============
- Ubuntu 16.04 or later::
apt-get install sshuttle
- Debian stretch or later::
apt-get install sshuttle
- Arch Linux::
pacman -S sshuttle
- Fedora::
dnf install sshuttle
- openSUSE::
zypper in sshuttle
- Gentoo::
emerge -av net-proxy/sshuttle
- NixOS::
nix-env -iA nixos.sshuttle
- From PyPI::
sudo pip install sshuttle
- Clone::
git clone https://github.com/sshuttle/sshuttle.git
cd sshuttle
sudo ./setup.py install
- FreeBSD::
# ports
cd /usr/ports/net/py-sshuttle && make install clean
# pkg
pkg install py39-sshuttle
- OpenBSD::
pkg_add sshuttle
- macOS, via MacPorts::
sudo port selfupdate
sudo port install sshuttle
It is also possible to install into a virtualenv as a non-root user.
- From PyPI::
python3 -m venv /tmp/sshuttle
. /tmp/sshuttle/bin/activate
pip install sshuttle
- Clone::
git clone https://github.com/sshuttle/sshuttle.git
cd sshuttle
python3 -m venv /tmp/sshuttle
. /tmp/sshuttle/bin/activate
python -m pip install .
- Homebrew::
brew install sshuttle
- Nix::
nix-shell -p sshuttle
- Windows::
pip install sshuttle

242
docs/make.bat
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@ -1,242 +0,0 @@
@ECHO OFF
REM Command file for Sphinx documentation
if "%SPHINXBUILD%" == "" (
set SPHINXBUILD=sphinx-build
)
set BUILDDIR=_build
set ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% .
set I18NSPHINXOPTS=%SPHINXOPTS% .
if NOT "%PAPER%" == "" (
set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
)
if "%1" == "" goto help
if "%1" == "help" (
:help
echo.Please use `make ^<target^>` where ^<target^> is one of
echo. html to make standalone HTML files
echo. dirhtml to make HTML files named index.html in directories
echo. singlehtml to make a single large HTML file
echo. pickle to make pickle files
echo. json to make JSON files
echo. htmlhelp to make HTML files and a HTML help project
echo. qthelp to make HTML files and a qthelp project
echo. devhelp to make HTML files and a Devhelp project
echo. epub to make an epub
echo. latex to make LaTeX files, you can set PAPER=a4 or PAPER=letter
echo. text to make text files
echo. man to make manual pages
echo. texinfo to make Texinfo files
echo. gettext to make PO message catalogs
echo. changes to make an overview over all changed/added/deprecated items
echo. xml to make Docutils-native XML files
echo. pseudoxml to make pseudoxml-XML files for display purposes
echo. linkcheck to check all external links for integrity
echo. doctest to run all doctests embedded in the documentation if enabled
goto end
)
if "%1" == "clean" (
for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
del /q /s %BUILDDIR%\*
goto end
)
%SPHINXBUILD% 2> nul
if errorlevel 9009 (
echo.
echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
echo.installed, then set the SPHINXBUILD environment variable to point
echo.to the full path of the 'sphinx-build' executable. Alternatively you
echo.may add the Sphinx directory to PATH.
echo.
echo.If you don't have Sphinx installed, grab it from
echo.http://sphinx-doc.org/
exit /b 1
)
if "%1" == "html" (
%SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The HTML pages are in %BUILDDIR%/html.
goto end
)
if "%1" == "dirhtml" (
%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
goto end
)
if "%1" == "singlehtml" (
%SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
goto end
)
if "%1" == "pickle" (
%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
if errorlevel 1 exit /b 1
echo.
echo.Build finished; now you can process the pickle files.
goto end
)
if "%1" == "json" (
%SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
if errorlevel 1 exit /b 1
echo.
echo.Build finished; now you can process the JSON files.
goto end
)
if "%1" == "htmlhelp" (
%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
if errorlevel 1 exit /b 1
echo.
echo.Build finished; now you can run HTML Help Workshop with the ^
.hhp project file in %BUILDDIR%/htmlhelp.
goto end
)
if "%1" == "qthelp" (
%SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
if errorlevel 1 exit /b 1
echo.
echo.Build finished; now you can run "qcollectiongenerator" with the ^
.qhcp project file in %BUILDDIR%/qthelp, like this:
echo.^> qcollectiongenerator %BUILDDIR%\qthelp\sshuttle.qhcp
echo.To view the help file:
echo.^> assistant -collectionFile %BUILDDIR%\qthelp\sshuttle.ghc
goto end
)
if "%1" == "devhelp" (
%SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
if errorlevel 1 exit /b 1
echo.
echo.Build finished.
goto end
)
if "%1" == "epub" (
%SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The epub file is in %BUILDDIR%/epub.
goto end
)
if "%1" == "latex" (
%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
if errorlevel 1 exit /b 1
echo.
echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
goto end
)
if "%1" == "latexpdf" (
%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
cd %BUILDDIR%/latex
make all-pdf
cd %BUILDDIR%/..
echo.
echo.Build finished; the PDF files are in %BUILDDIR%/latex.
goto end
)
if "%1" == "latexpdfja" (
%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
cd %BUILDDIR%/latex
make all-pdf-ja
cd %BUILDDIR%/..
echo.
echo.Build finished; the PDF files are in %BUILDDIR%/latex.
goto end
)
if "%1" == "text" (
%SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The text files are in %BUILDDIR%/text.
goto end
)
if "%1" == "man" (
%SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The manual pages are in %BUILDDIR%/man.
goto end
)
if "%1" == "texinfo" (
%SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
goto end
)
if "%1" == "gettext" (
%SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
goto end
)
if "%1" == "changes" (
%SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
if errorlevel 1 exit /b 1
echo.
echo.The overview file is in %BUILDDIR%/changes.
goto end
)
if "%1" == "linkcheck" (
%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
if errorlevel 1 exit /b 1
echo.
echo.Link check complete; look for any errors in the above output ^
or in %BUILDDIR%/linkcheck/output.txt.
goto end
)
if "%1" == "doctest" (
%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
if errorlevel 1 exit /b 1
echo.
echo.Testing of doctests in the sources finished, look at the ^
results in %BUILDDIR%/doctest/output.txt.
goto end
)
if "%1" == "xml" (
%SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The XML files are in %BUILDDIR%/xml.
goto end
)
if "%1" == "pseudoxml" (
%SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
if errorlevel 1 exit /b 1
echo.
echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
goto end
)
:end

503
docs/manpage.rst
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@ -1,503 +0,0 @@
sshuttle
========
Synopsis
--------
**sshuttle** [*options*] **-r** *[username@]sshserver[:port]* \<*subnets* ...\>
Description
-----------
:program:`sshuttle` allows you to create a VPN connection from your
machine to any remote server that you can connect to via ssh, as long
as that server has a sufficiently new Python installation.
To work, you must have root access on the local machine,
but you can have a normal account on the server.
It's valid to run :program:`sshuttle` more than once simultaneously on
a single client machine, connecting to a different server
every time, so you can be on more than one VPN at once.
If run on a router, :program:`sshuttle` can forward traffic for your
entire subnet to the VPN.
Options
-------
.. program:: sshuttle
.. option:: <subnets>
A list of subnets to route over the VPN, in the form
``a.b.c.d[/width][port[-port]]``. Valid examples are 1.2.3.4 (a
single IP address) and 1.2.3.4/32 (equivalent to 1.2.3.4),
1.2.3.0/24 (a 24-bit subnet, ie. with a 255.255.255.0 netmask).
Specify subnets 0/0 to match all IPv4 addresses and ::/0 to match
all IPv6 addresses. Any of the previous examples are also valid if
you append a port or a port range, so 1.2.3.4:8000 will only
tunnel traffic that has as the destination port 8000 of 1.2.3.4
and 1.2.3.0/24:8000-9000 will tunnel traffic going to any port
between 8000 and 9000 (inclusive) for all IPs in the 1.2.3.0/24
subnet. A hostname can be provided instead of an IP address. If
the hostname resolves to multiple IPs, all of the IPs are
included. If a width is provided with a hostname, the width is
applied to all of the hostnames IPs (if they are all either IPv4
or IPv6). Widths cannot be supplied to hostnames that resolve to
both IPv4 and IPv6. Valid examples are example.com,
example.com:8000, example.com/24, example.com/24:8000 and
example.com:8000-9000.
.. option:: --method <auto|nat|nft|tproxy|pf|ipfw>
Which firewall method should sshuttle use? For auto, sshuttle attempts to
guess the appropriate method depending on what it can find in PATH. The
default value is auto.
.. option:: -l <[ip:]port>, --listen=<[ip:]port>
Use this ip address and port number as the transparent
proxy port. By default :program:`sshuttle` finds an available
port automatically and listens on IP 127.0.0.1
(localhost), so you don't need to override it, and
connections are only proxied from the local machine,
not from outside machines. If you want to accept
connections from other machines on your network (ie. to
run :program:`sshuttle` on a router) try enabling IP Forwarding in
your kernel, then using ``--listen 0.0.0.0:0``.
You can use any name resolving to an IP address of the machine running
:program:`sshuttle`, e.g. ``--listen localhost``.
For the nft, tproxy and pf methods this can be an IPv6 address. Use
this option with comma separated values if required, to provide both
IPv4 and IPv6 addresses, e.g. ``--listen 127.0.0.1:0,[::1]:0``.
.. option:: -H, --auto-hosts
Scan for remote hostnames and update the local /etc/hosts
file with matching entries for as long as the VPN is
open. This is nicer than changing your system's DNS
(/etc/resolv.conf) settings, for several reasons. First,
hostnames are added without domain names attached, so
you can ``ssh thatserver`` without worrying if your local
domain matches the remote one. Second, if you :program:`sshuttle`
into more than one VPN at a time, it's impossible to
use more than one DNS server at once anyway, but
:program:`sshuttle` correctly merges /etc/hosts entries between
all running copies. Third, if you're only routing a
few subnets over the VPN, you probably would prefer to
keep using your local DNS server for everything else.
:program:`sshuttle` tries to store a cache of the hostnames in
~/.sshuttle.hosts on the remote host. Similarly, it tries to read
the file when you later reconnect to the host with --auto-hosts
enabled to quickly populate the host list. When troubleshooting
this feature, try removing this file on the remote host when
sshuttle is not running.
.. option:: -N, --auto-nets
In addition to the subnets provided on the command
line, ask the server which subnets it thinks we should
route, and route those automatically. The suggestions
are taken automatically from the server's routing
table.
This feature does not detect IPv6 routes. Specify IPv6 subnets
manually. For example, specify the ``::/0`` subnet on the command
line to route all IPv6 traffic.
.. option:: --dns
Capture local DNS requests and forward to the remote DNS
server. All queries to any of the local system's DNS
servers (/etc/resolv.conf and, if it exists,
/run/systemd/resolve/resolv.conf) will be intercepted and
resolved on the remote side of the tunnel instead, there
using the DNS specified via the :option:`--to-ns` option,
if specified. Only plain DNS traffic sent to these servers
on port 53 are captured.
.. option:: --ns-hosts=<server1[,server2[,server3[...]]]>
Capture local DNS requests to the specified server(s)
and forward to the remote DNS server. Contrary to the
:option:`--dns` option, this flag allows to specify the
DNS server(s) the queries to which to intercept,
instead of intercepting all DNS traffic on the local
machine. This can be useful when only certain DNS
requests should be resolved on the remote side of the
tunnel, e.g. in combination with dnsmasq.
.. option:: --to-ns=<server>
The DNS to forward requests to when remote DNS
resolution is enabled. If not given, sshuttle will
simply resolve using the system configured resolver on
the remote side (via /etc/resolv.conf on the remote
side).
.. option:: --python
Specify the name/path of the remote python interpreter. The
default is to use ``python3`` (or ``python``, if ``python3``
fails) in the remote system's PATH.
.. option:: -r <[username@]sshserver[:port]>, --remote=<[username@]sshserver[:port]>
The remote hostname and optional username and ssh
port number to use for connecting to the remote server.
For example, example.com, testuser@example.com,
testuser@example.com:2222, or example.com:2244. This
hostname is passed to ssh, so it will recognize any
aliases and settings you may have configured in
~/.ssh/config.
.. option:: -x <subnet>, --exclude=<subnet>
Explicitly exclude this subnet from forwarding. The
format of this option is the same as the ``<subnets>``
option. To exclude more than one subnet, specify the
``-x`` option more than once. You can say something like
``0/0 -x 1.2.3.0/24`` to forward everything except the
local subnet over the VPN, for example.
.. option:: -X <file>, --exclude-from=<file>
Exclude the subnets specified in a file, one subnet per
line. Useful when you have lots of subnets to exclude.
.. option:: -v, --verbose
Print more information about the session. This option
can be used more than once for increased verbosity. By
default, :program:`sshuttle` prints only error messages.
.. option:: -e, --ssh-cmd
The command to use to connect to the remote server. The
default is just ``ssh``. Use this if your ssh client is
in a non-standard location or you want to provide extra
options to the ssh command, for example, ``-e 'ssh -v'``.
.. option:: --remote-shell
For Windows targets, specify configured remote shell program alternative to defacto posix shell.
It would be either ``cmd`` or ``powershell`` unless something like git-bash is in use.
.. option:: --no-cmd-delimiter
Do not add a double dash (--) delimiter before invoking Python on
the remote host. This option is useful when the ssh command used
to connect is a custom command that does not interpret this
delimiter correctly.
.. option:: --seed-hosts
A comma-separated list of hostnames to use to
initialize the :option:`--auto-hosts` scan algorithm.
:option:`--auto-hosts` does things like poll netstat output
for lists of local hostnames, but can speed things up
if you use this option to give it a few names to start
from.
If this option is used *without* :option:`--auto-hosts`,
then the listed hostnames will be scanned and added, but
no further hostnames will be added.
.. option:: --no-latency-control
Sacrifice latency to improve bandwidth benchmarks. ssh
uses really big socket buffers, which can overload the
connection if you start doing large file transfers,
thus making all your other sessions inside the same
tunnel go slowly. Normally, :program:`sshuttle` tries to avoid
this problem using a "fullness check" that allows only
a certain amount of outstanding data to be buffered at
a time. But on high-bandwidth links, this can leave a
lot of your bandwidth underutilized. It also makes
:program:`sshuttle` seem slow in bandwidth benchmarks (benchmarks
rarely test ping latency, which is what :program:`sshuttle` is
trying to control). This option disables the latency
control feature, maximizing bandwidth usage. Use at
your own risk.
.. option:: --latency-buffer-size
Set the size of the buffer used in latency control. The
default is ``32768``. Changing this option allows a compromise
to be made between latency and bandwidth without completely
disabling latency control (with :option:`--no-latency-control`).
.. option:: -D, --daemon
Automatically fork into the background after connecting
to the remote server. Implies :option:`--syslog`.
.. option:: -s <file>, --subnets=<file>
Include the subnets specified in a file instead of on the
command line. One subnet per line.
.. option:: --syslog
after connecting, send all log messages to the
:manpage:`syslog(3)` service instead of stderr. This is
implicit if you use :option:`--daemon`.
.. option:: --pidfile=<pidfilename>
when using :option:`--daemon`, save :program:`sshuttle`'s pid to
*pidfilename*. The default is ``sshuttle.pid`` in the
current directory.
.. option:: --disable-ipv6
Disable IPv6 support for methods that support it (nat, nft,
tproxy, and pf).
.. option:: --firewall
(internal use only) run the firewall manager. This is
the only part of :program:`sshuttle` that must run as root. If
you start :program:`sshuttle` as a non-root user, it will
automatically run ``sudo`` or ``su`` to start the firewall
manager, but the core of :program:`sshuttle` still runs as a
normal user.
.. option:: --hostwatch
(internal use only) run the hostwatch daemon. This
process runs on the server side and collects hostnames for
the :option:`--auto-hosts` option. Using this option by itself
makes it a lot easier to debug and test the :option:`--auto-hosts`
feature.
.. option:: --sudoers-no-modify
sshuttle prints a configuration to stdout which allows a user to
run sshuttle without a password. This option is INSECURE because,
with some cleverness, it also allows the user to run any command
as root without a password. The output also includes a suggested
method for you to install the configuration.
Use --sudoers-user to modify the user that it applies to.
.. option:: --sudoers-user
Set the user name or group with %group_name for passwordless
operation. Default is the current user. Set to ALL for all users
(NOT RECOMMENDED: See note about security in --sudoers-no-modify
documentation above). Only works with the --sudoers-no-modify
option.
.. option:: -t <mark>, --tmark=<mark>
An option used by the tproxy method: Use the specified traffic
mark. The mark must be a hexadecimal value. Defaults to 0x01.
.. option:: --version
Print program version.
Configuration File
------------------
All the options described above can optionally be specified in a configuration
file.
To run :program:`sshuttle` with options defined in, e.g., `/etc/sshuttle.conf`
just pass the path to the file preceded by the `@` character, e.g.
`@/etc/sshuttle.conf`.
When running :program:`sshuttle` with options defined in a configuration file,
options can still be passed via the command line in addition to what is
defined in the file. If a given option is defined both in the file and in
the command line, the value in the command line will take precedence.
Arguments read from a file must be one per line, as shown below::
value
--option1
value1
--option2
value2
The configuration file supports comments for human-readable
annotations. For example::
# company-internal API
8.8.8.8/32
# home IoT
192.168.63.0/24
Environment Variable
--------------------
You can specify command line options with the `SSHUTTLE_ARGS` environment
variable. If a given option is defined in both the environment variable and
command line, the value on the command line will take precedence.
For example::
SSHUTTLE_ARGS="-e 'ssh -v' --dns" sshuttle -r example.com 0/0
Examples
--------
Use the following command to route all IPv4 TCP traffic through remote
(-r) host example.com (and possibly other traffic too, depending on
the selected --method). The 0/0 subnet, short for 0.0.0.0/0, matches
all IPv4 addresses. The ::/0 subnet, matching all IPv6 addresses could
be added to the example. We also exclude (-x) example.com:22 so that
we can establish ssh connections from our local machine to the remote
host without them being routed through sshuttle. Excluding the remote
host may be necessary on some machines for sshuttle to work properly.
Press Ctrl+C to exit. To also route DNS queries through sshuttle, try
adding --dns. Add or remove -v options to see more or less
information::
$ sshuttle -r example.com -x example.com:22 0/0
Starting sshuttle proxy (version ...).
[local sudo] Password:
fw: Starting firewall with Python version 3.9.5
fw: ready method name nat.
c : IPv6 disabled since it isn't supported by method nat.
c : Method: nat
c : IPv4: on
c : IPv6: off (not available with nat method)
c : UDP : off (not available with nat method)
c : DNS : off (available)
c : User: off (available)
c : Subnets to forward through remote host (type, IP, cidr mask width, startPort, endPort):
c : (<AddressFamily.AF_INET: 2>, '0.0.0.0', 0, 0, 0)
c : Subnets to exclude from forwarding:
c : (<AddressFamily.AF_INET: 2>, '...', 32, 22, 22)
c : (<AddressFamily.AF_INET: 2>, '127.0.0.1', 32, 0, 0)
c : TCP redirector listening on ('127.0.0.1', 12299).
c : Starting client with Python version 3.9.5
c : Connecting to server...
user@example.com's password:
s: Starting server with Python version 3.6.8
s: latency control setting = True
s: auto-nets:False
c : Connected to server.
fw: setting up.
fw: iptables -w -t nat -N sshuttle-12299
fw: iptables -w -t nat -F sshuttle-12299
...
Accept: 192.168.42.121:60554 -> 77.141.99.22:22.
^C
c : Keyboard interrupt: exiting.
c : SW'unknown':Mux#1: deleting (1 remain)
c : SW#7:192.168.42.121:60554: deleting (0 remain)
Connect to a remote server, with automatic hostname
and subnet guessing::
$ sshuttle -vNHr example.com -x example.com:22
Starting sshuttle proxy (version ...).
[local sudo] Password:
fw: Starting firewall with Python version 3.9.5
fw: ready method name nat.
c : IPv6 disabled since it isn't supported by method nat.
c : Method: nat
c : IPv4: on
c : IPv6: off (not available with nat method)
c : UDP : off (not available with nat method)
c : DNS : off (available)
c : User: off (available)
c : Subnets to forward through remote host (type, IP, cidr mask width, startPort, endPort):
c : NOTE: Additional subnets to forward may be added below by --auto-nets.
c : Subnets to exclude from forwarding:
c : (<AddressFamily.AF_INET: 2>, '...', 32, 22, 22)
c : (<AddressFamily.AF_INET: 2>, '127.0.0.1', 32, 0, 0)
c : TCP redirector listening on ('127.0.0.1', 12300).
c : Starting client with Python version 3.9.5
c : Connecting to server...
user@example.com's password:
s: Starting server with Python version 3.6.8
s: latency control setting = True
s: auto-nets:True
c : Connected to server.
c : seed_hosts: []
s: available routes:
s: 77.141.99.0/24
fw: setting up.
fw: iptables -w -t nat -N sshuttle-12300
fw: iptables -w -t nat -F sshuttle-12300
...
c : Accept: 192.168.42.121:60554 -> 77.141.99.22:22.
^C
c : Keyboard interrupt: exiting.
c : SW'unknown':Mux#1: deleting (1 remain)
c : SW#7:192.168.42.121:60554: deleting (0 remain)
Run :program:`sshuttle` with a `/etc/sshuttle.conf` configuration file::
$ sshuttle @/etc/sshuttle.conf
Use the options defined in `/etc/sshuttle.conf` but be more verbose::
$ sshuttle @/etc/sshuttle.conf -vvv
Override the remote server defined in `/etc/sshuttle.conf`::
$ sshuttle @/etc/sshuttle.conf -r otheruser@test.example.com
Example configuration file::
192.168.0.0/16
--remote
user@example.com
Discussion
----------
When it starts, :program:`sshuttle` creates an ssh session to the
server specified by the ``-r`` option.
After connecting to the remote server, :program:`sshuttle` uploads its
(python) source code to the remote end and executes it
there. Thus, you don't need to install :program:`sshuttle` on the
remote server, and there are never :program:`sshuttle` version
conflicts between client and server.
Unlike most VPNs, :program:`sshuttle` forwards sessions, not packets.
That is, it uses kernel transparent proxying (`iptables
REDIRECT` rules on Linux) to
capture outgoing TCP sessions, then creates entirely
separate TCP sessions out to the original destination at
the other end of the tunnel.
Packet-level forwarding (eg. using the tun/tap devices on
Linux) seems elegant at first, but it results in
several problems, notably the 'tcp over tcp' problem. The
tcp protocol depends fundamentally on packets being dropped
in order to implement its congestion control algorithm; if
you pass tcp packets through a tcp-based tunnel (such as
ssh), the inner tcp packets will never be dropped, and so
the inner tcp stream's congestion control will be
completely broken, and performance will be terrible. Thus,
packet-based VPNs (such as IPsec and openvpn) cannot use
tcp-based encrypted streams like ssh or ssl, and have to
implement their own encryption from scratch, which is very
complex and error prone.
:program:`sshuttle`'s simplicity comes from the fact that it can
safely use the existing ssh encrypted tunnel without
incurring a performance penalty. It does this by letting
the client-side kernel manage the incoming tcp stream, and
the server-side kernel manage the outgoing tcp stream;
there is no need for congestion control to be shared
between the two separate streams, so a tcp-based tunnel is
fine.
.. seealso::
:manpage:`ssh(1)`, :manpage:`python(1)`

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OpenWRT
========
Run::
opkg install python3 python3-pip iptables-mod-extra iptables-mod-nat-extra iptables-mod-ipopt
python3 /usr/bin/pip3 install sshuttle
sshuttle -l 0.0.0.0 -r <IP> -x 192.168.1.1 0/0

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Overview
========
As far as I know, sshuttle is the only program that solves the following
common case:
- Your client machine (or router) is Linux, MacOS, FreeBSD, OpenBSD or pfSense.
- You have access to a remote network via ssh.
- You don't necessarily have admin access on the remote network.
- The remote network has no VPN, or only stupid/complex VPN
protocols (IPsec, PPTP, etc). Or maybe you *are* the
admin and you just got frustrated with the awful state of
VPN tools.
- You don't want to create an ssh port forward for every
single host/port on the remote network.
- You hate openssh's port forwarding because it's randomly
slow and/or stupid.
- You can't use openssh's PermitTunnel feature because
it's disabled by default on openssh servers; plus it does
TCP-over-TCP, which has terrible performance (see below).

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Platform Specific Notes
=======================
Contents:
.. toctree::
:maxdepth: 2
chromeos
tproxy
windows
openwrt

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Requirements
============
Client side Requirements
------------------------
- sudo, or root access on your client machine.
(The server doesn't need admin access.)
- Python 3.9 or greater.
Linux with NAT method
~~~~~~~~~~~~~~~~~~~~~
Supports:
* IPv4 TCP
* IPv4 DNS
* IPv6 TCP
* IPv6 DNS
Requires:
* iptables DNAT and REDIRECT modules. ip6tables for IPv6.
Linux with nft method
~~~~~~~~~~~~~~~~~~~~~
Supports
* IPv4 TCP
* IPv4 DNS
* IPv6 TCP
* IPv6 DNS
Requires:
* nftables
Linux with TPROXY method
~~~~~~~~~~~~~~~~~~~~~~~~
Supports:
* IPv4 TCP
* IPv4 UDP
* IPv4 DNS
* IPv6 TCP
* IPv6 UDP
* IPv6 DNS
MacOS / FreeBSD / OpenBSD / pfSense
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Method: pf
Supports:
* IPv4 TCP
* IPv4 DNS
* IPv6 TCP
* IPv6 DNS
Requires:
* You need to have the pfctl command.
Windows
~~~~~~~
Experimental built-in support available. See :doc:`windows` for more information.
Server side Requirements
------------------------
- Python 3.9 or greater.
Additional Suggested Software
-----------------------------
- If you are using systemd, sshuttle can notify it when the connection to
the remote end is established and the firewall rules are installed. For
this feature to work you must configure the process start-up type for the
sshuttle service unit to notify, as shown in the example below.
.. code-block:: ini
:emphasize-lines: 6
[Unit]
Description=sshuttle
After=network.target
[Service]
Type=notify
ExecStart=/usr/bin/sshuttle --dns --remote <user>@<server> <subnets...>
[Install]
WantedBy=multi-user.target

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Support
=======
Mailing list:
* Subscribe by sending a message to <sshuttle+subscribe@googlegroups.com>
* List archives are at: http://groups.google.com/group/sshuttle
Issue tracker and pull requests at github:
* https://github.com/sshuttle/sshuttle

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TPROXY
======
TPROXY is the only method that supports UDP.
There are some things you need to consider for TPROXY to work:
- The following commands need to be run first as root. This only needs to be
done once after booting up::
ip route add local default dev lo table 100
ip rule add fwmark {TMARK} lookup 100
ip -6 route add local default dev lo table 100
ip -6 rule add fwmark {TMARK} lookup 100
where {TMARK} is the identifier mark passed with -t or --tmark flag
as a hexadecimal string (default value is '0x01').
- The ``--auto-nets`` feature does not detect IPv6 routes automatically. Add IPv6
routes manually. e.g. by adding ``'::/0'`` to the end of the command line.
- The client needs to be run as root. e.g.::
sudo SSH_AUTH_SOCK="$SSH_AUTH_SOCK" $HOME/tree/sshuttle.tproxy/sshuttle --method=tproxy ...
- You may need to exclude the IP address of the server you are connecting to.
Otherwise sshuttle may attempt to intercept the ssh packets, which will not
work. Use the ``--exclude`` parameter for this.
- You need the ``--method=tproxy`` parameter, as above.
- The routes for the outgoing packets must already exist. For example, if your
connection does not have IPv6 support, no IPv6 routes will exist, IPv6
packets will not be generated and sshuttle cannot intercept them::
telnet -6 www.google.com 80
Trying 2404:6800:4001:805::1010...
telnet: Unable to connect to remote host: Network is unreachable
Add some dummy routes to external interfaces. Make sure they get removed
however after sshuttle exits.

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Useless Trivia
==============
This section written by the original author, Avery Pennarun
<apenwarr@gmail.com>.
Back in 1998, I released the first version of `Tunnel
Vision <http://alumnit.ca/wiki/?TunnelVisionReadMe>`_, a semi-intelligent VPN
client for Linux. Unfortunately, I made two big mistakes: I implemented the
key exchange myself (oops), and I ended up doing TCP-over-TCP (double oops).
The resulting program worked okay - and people used it for years - but the
performance was always a bit funny. And nobody ever found any security flaws
in my key exchange, either, but that doesn't mean anything. :)
The same year, dcoombs and I also released Fast Forward, a proxy server
supporting transparent proxying. Among other things, we used it for
automatically splitting traffic across more than one Internet connection (a
tool we called "Double Vision").
I was still in university at the time. A couple years after that, one of my
professors was working with some graduate students on the technology that would
eventually become `Slipstream Internet Acceleration
<http://www.slipstream.com/>`_. He asked me to do a contract for him to build
an initial prototype of a transparent proxy server for mobile networks. The
idea was similar to sshuttle: if you reassemble and then disassemble the TCP
packets, you can reduce latency and improve performance vs. just forwarding
the packets over a plain VPN or mobile network. (It's unlikely that any of my
code has persisted in the Slipstream product today, but the concept is still
pretty cool. I'm still horrified that people use plain TCP on complex mobile
networks with crazily variable latency, for which it was never really
intended.)
That project I did for Slipstream was what first gave me the idea to merge
the concepts of Fast Forward, Double Vision, and Tunnel Vision into a single
program that was the best of all worlds. And here we are, at last.
You're welcome.

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Usage
=====
.. note::
For information on usage with Windows, see the :doc:`windows` section.
For information on using the TProxy method, see the :doc:`tproxy` section.
Forward all traffic::
sshuttle -r username@sshserver 0.0.0.0/0
- Use the :option:`sshuttle -r` parameter to specify a remote server.
On some systems, you may also need to use the :option:`sshuttle -x`
parameter to exclude sshserver or sshserver:22 so that your local
machine can communicate directly to sshserver without it being
redirected by sshuttle.
- By default sshuttle will automatically choose a method to use. Override with
the :option:`sshuttle --method` parameter.
- There is a shortcut for 0.0.0.0/0 for those that value
their wrists::
sshuttle -r username@sshserver 0/0
- For 'My VPN broke and need a temporary solution FAST to access local IPv4 addresses'::
sshuttle --dns -NHr username@sshserver 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
If you would also like your DNS queries to be proxied
through the DNS server of the server you are connect to::
sshuttle --dns -r username@sshserver 0/0
The above is probably what you want to use to prevent
local network attacks such as Firesheep and friends.
See the documentation for the :option:`sshuttle --dns` parameter.
(You may be prompted for one or more passwords; first, the local password to
become root using sudo, and then the remote ssh password. Or you might have
sudo and ssh set up to not require passwords, in which case you won't be
prompted at all.)
Usage Notes
-----------
That's it! Now your local machine can access the remote network as if you
were right there. And if your "client" machine is a router, everyone on
your local network can make connections to your remote network.
You don't need to install sshuttle on the remote server;
the remote server just needs to have python available.
sshuttle will automatically upload and run its source code
to the remote python interpreter.
This creates a transparent proxy server on your local machine for all IP
addresses that match 0.0.0.0/0. (You can use more specific IP addresses if
you want; use any number of IP addresses or subnets to change which
addresses get proxied. Using 0.0.0.0/0 proxies *everything*, which is
interesting if you don't trust the people on your local network.)
Any TCP session you initiate to one of the proxied IP addresses will be
captured by sshuttle and sent over an ssh session to the remote copy of
sshuttle, which will then regenerate the connection on that end, and funnel
the data back and forth through ssh.
Fun, right? A poor man's instant VPN, and you don't even have to have
admin access on the server.
Sudoers File
------------
sshuttle can generate a sudoers.d file for Linux and MacOS. This
allows one or more users to run sshuttle without entering the
local sudo password. **WARNING:** This option is *insecure*
because, with some cleverness, it also allows these users to run any
command (via the --ssh-cmd option) as root without a password.
To print a sudo configuration file and see a suggested way to install it, run::
sshuttle --sudoers-no-modify
A custom user or group can be set with the
:option:`sshuttle --sudoers-no-modify --sudoers-user {user_descriptor}`
option. Valid values for this vary based on how your system is configured.
Values such as usernames, groups prepended with `%` and sudoers user
aliases will work. See the sudoers manual for more information on valid
user-specified actions. The option must be used with `--sudoers-no-modify`::
sshuttle --sudoers-no-modify --sudoers-user mike
sshuttle --sudoers-no-modify --sudoers-user %sudo

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Microsoft Windows
=================
Experimental native support::
Experimental built-in support for Windows is available through `windivert` method.
You have to install https://pypi.org/project/pydivert package. You need Administrator privileges to use windivert method
Notes
- sshuttle should be executed from admin shell (Automatic firewall process admin elevation is not available)
- TCP/IPv4 supported (IPv6/UDP/DNS are not available)
Use Linux VM on Windows::
What we can really do is to create a Linux VM with Vagrant (or simply
Virtualbox if you like). In the Vagrant settings, remember to turn on bridged
NIC. Then, run sshuttle inside the VM like below::
sshuttle -l 0.0.0.0 -x 10.0.0.0/8 -x 192.168.0.0/16 0/0
10.0.0.0/8 excludes NAT traffic of Vagrant and 192.168.0.0/16 excludes
traffic to local area network (assuming that we're using 192.168.0.0 subnet).
Assuming the VM has the IP 192.168.1.200 obtained on the bridge NIC (we can
configure that in Vagrant), we can then ask Windows to route all its traffic
via the VM by running the following in cmd.exe with admin right::
route add 0.0.0.0 mask 0.0.0.0 192.168.1.200

133
flake.lock generated
View File

@ -1,133 +0,0 @@
{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1731533236,
"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1740743217,
"narHash": "sha256-brsCRzLqimpyhORma84c3W2xPbIidZlIc3JGIuQVSNI=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "b27ba4eb322d9d2bf2dc9ada9fd59442f50c8d7c",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-24.11",
"repo": "nixpkgs",
"type": "github"
}
},
"pyproject-build-systems": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
],
"uv2nix": [
"uv2nix"
]
},
"locked": {
"lastModified": 1740362541,
"narHash": "sha256-S8Mno07MspggOv/xIz5g8hB2b/C5HPiX8E+rXzKY+5U=",
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"rev": "e151741c848ba92331af91f4e47640a1fb82be19",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"type": "github"
}
},
"pyproject-nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1739758351,
"narHash": "sha256-Aoa4dEoC7Hf6+gFVk/SDquZTMFlmlfsgdTWuqQxzePs=",
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"rev": "1329712f7f9af3a8b270764ba338a455b7323811",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs",
"pyproject-build-systems": "pyproject-build-systems",
"pyproject-nix": "pyproject-nix",
"uv2nix": "uv2nix"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
},
"uv2nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
]
},
"locked": {
"lastModified": 1740497536,
"narHash": "sha256-K+8wsVooqhaqyxuvew3+62mgOfRLJ7whv7woqPU3Ypo=",
"owner": "pyproject-nix",
"repo": "uv2nix",
"rev": "d01fd3a141755ad5d5b93dd9fcbd76d6401f5bac",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "uv2nix",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

117
flake.nix
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@ -1,117 +0,0 @@
{
description = "Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin. Works with Linux and MacOS. Supports DNS tunneling.";
inputs = {
flake-utils.url = "github:numtide/flake-utils";
nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
pyproject-nix = {
url = "github:pyproject-nix/pyproject.nix";
inputs.nixpkgs.follows = "nixpkgs";
};
uv2nix = {
url = "github:pyproject-nix/uv2nix";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.nixpkgs.follows = "nixpkgs";
};
pyproject-build-systems = {
url = "github:pyproject-nix/build-system-pkgs";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.uv2nix.follows = "uv2nix";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs =
{
self,
nixpkgs,
flake-utils,
pyproject-nix,
uv2nix,
pyproject-build-systems,
}:
flake-utils.lib.eachDefaultSystem (
system:
let
inherit (nixpkgs) lib;
pkgs = nixpkgs.legacyPackages.${system};
python = pkgs.python312;
workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
# Create package overlay from workspace.
overlay = workspace.mkPyprojectOverlay {
sourcePreference = "sdist";
};
# Extend generated overlay with build fixups
#
# Uv2nix can only work with what it has, and uv.lock is missing essential metadata to perform some builds.
# This is an additional overlay implementing build fixups.
# See:
# - https://pyproject-nix.github.io/uv2nix/FAQ.html
pyprojectOverrides =
final: prev:
# Implement build fixups here.
# Note that uv2nix is _not_ using Nixpkgs buildPythonPackage.
# It's using https://pyproject-nix.github.io/pyproject.nix/build.html
let
inherit (final) resolveBuildSystem;
inherit (builtins) mapAttrs;
# Build system dependencies specified in the shape expected by resolveBuildSystem
# The empty lists below are lists of optional dependencies.
#
# A package `foo` with specification written as:
# `setuptools-scm[toml]` in pyproject.toml would be written as
# `foo.setuptools-scm = [ "toml" ]` in Nix
buildSystemOverrides = {
chardet.setuptools = [ ];
colorlog.setuptools = [ ];
python-debian.setuptools = [ ];
pluggy.setuptools = [ ];
pathspec.flit-core = [ ];
packaging.flit-core = [ ];
};
in
mapAttrs (
name: spec:
prev.${name}.overrideAttrs (old: {
nativeBuildInputs = old.nativeBuildInputs ++ resolveBuildSystem spec;
})
) buildSystemOverrides;
pythonSet =
(pkgs.callPackage pyproject-nix.build.packages {
inherit python;
}).overrideScope
(
lib.composeManyExtensions [
pyproject-build-systems.overlays.default
overlay
pyprojectOverrides
]
);
inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
package = mkApplication {
venv = pythonSet.mkVirtualEnv "sshuttle" workspace.deps.default;
package = pythonSet.sshuttle;
};
in
{
packages = {
sshuttle = package;
default = package;
};
devShells.default = pkgs.mkShell {
packages = [
pkgs.uv
];
};
}
);
}

28
packaging/control Normal file
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@ -0,0 +1,28 @@
Package: sshuttle
Version: 0+git
Architecture: all
Maintainer: Jim Wyllie <jwyllie83@gmail.com>
Depends: iptables, python (>= 2.6)
Suggests: autossh
Section: net
Priority: optional
Homepage: http://github.com/sshuttle/sshuttle
Description: "Full-featured" VPN over an SSH tunnel
It allows full remote access somewhere where all you have is an SSH
connection. It works well if you generally find yourself in the
following situation:
.
- Your client machine (or router) is Linux, FreeBSD, or MacOS.
- You have access to a remote network via ssh.
- You don't necessarily have admin access on the remote network.
- You do not wish to, or can't, use other VPN software
- You don't want to create an ssh port forward for every
single host/port on the remote network.
- You hate openssh's port forwarding because it's randomly
slow and/or stupid.
- You can't use openssh's PermitTunnel feature because
it's disabled by default on openssh servers; plus it does
TCP-over-TCP, which has suboptimal performance
.
It also has hooks for more complicated setups (VPN-in-a-SSH-VPN, etc.) to allow
you to set it up as you like.

46
packaging/make_deb Executable file
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@ -0,0 +1,46 @@
#!/bin/bash
#
# This script puts together a .deb package suitable for installing on an Ubuntu
# system
B="/tmp/sshuttle/build"
if [ ! -x /usr/bin/dpkg ]; then
echo 'Unable to build: dpkg not found on system'
exit 1
fi
# Create the new directory structure
mkdir -p ${B}/etc/sshuttle/pre-start.d
mkdir -p ${B}/etc/sshuttle/post-stop.d
mkdir -p ${B}/usr/share/sshuttle
mkdir -p ${B}/usr/bin
mkdir -p ${B}/etc/init
mkdir -p ${B}/DEBIAN
# Copy over all of the files
cp -r ../src/* ${B}/usr/share/sshuttle
cp ../src/sshuttle ${B}/usr/bin
cp -r sshuttle.conf ${B}/etc/init
cp prefixes.conf ${B}/etc/sshuttle
cp tunnel.conf ${B}/etc/sshuttle
# Remove MacOS X stuff from .deb
rm -r ${B}/usr/share/sshuttle/ui-macos
# Fix path to main.py
sed -e 's:^DIR=.*$:DIR=/usr/share/sshuttle/:' -i ${B}/usr/bin/sshuttle
# Copy the control file over, as well
cp control ${B}/DEBIAN
# Create the md5sum manifest
if [ -x /usr/bin/md5sum ]; then
cd ${B}
find . -type f | egrep -v DEBIAN | sed -re 's/^..//' | xargs md5sum > ${B}/DEBIAN/md5sums
cd ${OLDPWD}
fi
# Build the debian package
VERSION=$(egrep -e '^Version' control | sed -re 's/^[^:]*: //')
dpkg --build ${B} ./sshuttle-${VERSION}.deb
rm -rf ${B}

5
packaging/prefixes.conf Normal file
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@ -0,0 +1,5 @@
# Output prefixes here, one per line. Prefix is in:
# prefix/netmask format
# Like this:
# 192.168.0.0/16
# 192.0.43.10/32

90
packaging/sshuttle.conf Normal file
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@ -0,0 +1,90 @@
description "Create a transparent proxy over SSH"
author "Jim Wyllie <jwyllie83@gmail.com>"
manual
nice -5
# Edit this file with network prefixes that should be loaded through the SSH
# tunnel.
env PREFIX_LOCATION=/etc/sshuttle/prefixes.conf
# Routing table; defaults to 100
env ROUTE_TABLE=100
# fwmark; defaults to 1
env FWMARK=1
# SSH tunnel configuration file
env SSHUTTLE_TUNNEL_FILE=/etc/sshuttle/tunnel.conf
# File containing the tunnel proxy name / host / whatever
env TUNNEL_PROXY="/etc/sshuttle/tunnel.conf"
# Any other commands needed to run before or after loading the SSH tunnel.
# This is where you can put any of your hacks to set up tunnels-in-tunnels,
# etc. Scripts in this directory are executed in order.
env MISC_START_DIR=/etc/sshuttle/pre-start.d
env MISC_STOP_DIR=/etc/sshuttle/post-stop.d
start on (local-filesystems and net-device-up IFACE!=lo)
stop on stopping network-services
#respawn
pre-start script
# Make sure we have created the routes
sudo ip rule add fwmark ${FWMARK} lookup ${ROUTE_TABLE}
logger "Starting sshuttle..."
if [ -f "${PREFIX_LOCATION}" ]; then
cat "${PREFIX_LOCATION}" | while read ROUTE; do
# Skip comments
if [ -n "$(echo ${ROUTE} | egrep "^[ ]*#")" ]; then
continue
fi
# Skip empty lines
if [ -z "${ROUTE}" ]; then
continue
fi
logger "Adding route: ${ROUTE}"
ip route add local ${ROUTE} dev lo table ${ROUTE_TABLE}
done
fi
for RUNFILE in ${MISC_START_DIR}/*; do
logger "Executing ${RUNFILE}"
/bin/sh -c "${RUNFILE}"
done
end script
post-stop script
if [ -f "${PREFIX_LOCATION}" ]; then
cat "${PREFIX_LOCATION}" | while read ROUTE; do
# Skip comments
if [ -n "$(echo ${ROUTE} | egrep "^[ ]*#")" ]; then
continue
fi
# Skip empty lines
if [ -z "${ROUTE}" ]; then
continue
fi
logger "Deleting route: ${ROUTE}"
ip route del local ${ROUTE} dev lo table ${ROUTE_TABLE}
done
fi
ip rule del fwmark ${FWMARK}
for RUNFILE in "${MISC_STOP_DIR}/*"; do
logger "Executing ${RUNFILE}"
/bin/sh -c "${RUNFILE}"
done
end script
exec /usr/bin/sshuttle --dns --method=tproxy --listen 0.0.0.0 --remote sshuttle_tunnel -s /etc/sshuttle/prefixes.conf -e "ssh -F ${TUNNEL_PROXY}"

19
packaging/tunnel.conf Normal file
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@ -0,0 +1,19 @@
# Here is where you can specify any SSH tunnel options See ssh_config(5) for
# details. You need to leave the Host line intact, but everything else can
# specify whatever you want
Host sshuttle_tunnel
# REQUIRED: Set this to be the host to which you would like to connect your
# tunnel
#Hostname localhost
# REQUIRED: Set this to be the target SSH user on the remote system
#User foo
# ---------------------------------------------------------------------------
# The rest are all optional; see ssh_config(5) for the full list of what can
# be specified. Some very commonly needed ones are below.
# ---------------------------------------------------------------------------
# SSH key used for connecting
#IdentityFile /path/to/key

57
pyproject.toml
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@ -1,57 +0,0 @@
[project]
authors = [
{name = "Brian May", email = "brian@linuxpenguins.xyz"},
]
license = {text = "LGPL-2.1"}
requires-python = "<4.0,>=3.9"
dependencies = []
name = "sshuttle"
version = "1.3.1"
description = "Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin. Works with Linux and MacOS. Supports DNS tunneling."
readme = "README.rst"
classifiers = [
"Development Status :: 5 - Production/Stable",
"Intended Audience :: Developers",
"Intended Audience :: End Users/Desktop",
"License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)",
"Operating System :: OS Independent",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Topic :: System :: Networking",
]
[project.scripts]
sshuttle = "sshuttle.cmdline:main"
[dependency-groups]
dev = [
"pytest<9.0.0,>=8.0.1",
"pytest-cov<7.0,>=4.1",
"flake8<8.0.0,>=7.0.0",
"pyflakes<4.0.0,>=3.2.0",
"bump2version<2.0.0,>=1.0.1",
"twine<7,>=5",
"black>=25.1.0",
"jedi-language-server>=0.44.0",
"pylsp-mypy>=0.7.0",
"python-lsp-server>=1.12.2",
"ruff>=0.11.2",
]
docs = [
"sphinx==8.1.3; python_version ~= \"3.10\"",
"furo==2024.8.6",
]
[tool.uv]
default-groups = []
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
[tool.hatch.build.targets.sdist]
exclude = [
"/.jj"
]

15
run
View File

@ -1,15 +0,0 @@
#!/usr/bin/env sh
set -e
export PYTHONPATH="$(dirname "$0"):$PYTHONPATH"
export PATH="$(dirname "$0")/bin:$PATH"
python_best_version() {
if [ -x "$(command -v python3)" ] &&
python3 -c "import sys; sys.exit(not sys.version_info > (3, 5))"; then
exec python3 "$@"
else
exec python "$@"
fi
}
python_best_version -m "sshuttle" "$@"

39
scripts/Containerfile
View File

@ -1,39 +0,0 @@
# https://hub.docker.com/r/linuxserver/openssh-server/
ARG BASE_IMAGE=docker.io/linuxserver/openssh-server:version-9.3_p2-r1
FROM ${BASE_IMAGE} as pyenv
# https://github.com/pyenv/pyenv/wiki#suggested-build-environment
RUN apk add --no-cache build-base git libffi-dev openssl-dev bzip2-dev zlib-dev readline-dev sqlite-dev
ENV PYENV_ROOT=/pyenv
RUN curl https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
RUN /pyenv/bin/pyenv install 3.10
RUN /pyenv/bin/pyenv install 3.11
RUN /pyenv/bin/pyenv install 3.12
RUN bash -xc 'rm -rf /pyenv/{.git,plugins} /pyenv/versions/*/lib/*/{test,config,config-*linux-gnu}' && \
find /pyenv -type d -name __pycache__ -exec rm -rf {} + && \
find /pyenv -type f -name '*.py[co]' -delete
FROM ${BASE_IMAGE}
RUN apk add --no-cache bash nginx iperf3
# pyenv setup
ENV PYENV_ROOT=/pyenv
ENV PATH=/pyenv/shims:/pyenv/bin:$PATH
COPY --from=pyenv /pyenv /pyenv
# OpenSSH Server variables
ENV PUID=1000
ENV PGID=1000
ENV PASSWORD_ACCESS=true
ENV USER_NAME=test
ENV USER_PASSWORD=test
ENV LOG_STDOUT=true
# suppress linuxserver.io logo printing, chnage sshd config
RUN sed -i '1 a exec &>/dev/null' /etc/s6-overlay/s6-rc.d/init-adduser/run
# https://www.linuxserver.io/blog/2019-09-14-customizing-our-containers
# To customize the container and start other components
COPY container.setup.sh /custom-cont-init.d/setup.sh

21
scripts/README.md
View File

@ -1,21 +0,0 @@
# Container based test bed for sshuttle
```bash
test-bed up -d # start containers
exec-sshuttle <node-id> [--copy-id] [--server-py=2.7|3.10] [--client-py=2.7|3.10] [--sshuttle-bin=/path/to/sshuttle] [sshuttle-args...]
# --copy-id -> optionally do ssh-copy-id to make it passwordless for future runs
# --sshuttle-bin -> use another sshuttle binary instead of one from dev setup
# --server-py -> Python version to use in server. (manged by pyenv)
# --client-py -> Python version to use in client (manged by pyenv)
exec-sshuttle node-1 # start sshuttle to connect to node-1
exec-tool curl node-1 # curl to nginx instance running on node1 via IP that is only reachable via sshuttle
exec-tool iperf3 node-1 # measure throughput to node-1
run-benchmark node-1 --client-py=3.10
```
<https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_server_configuration#configuring-the-default-shell-for-openssh-in-windows>

34
scripts/compose.yml
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@ -1,34 +0,0 @@
name: sshuttle-testbed
services:
node-1:
image: ghcr.io/sshuttle/sshuttle-testbed
container_name: sshuttle-testbed-node-1
hostname: node-1
cap_add:
- "NET_ADMIN"
environment:
- ADD_IP_ADDRESSES=10.55.1.77/24
networks:
default:
ipv6_address: 2001:0DB8::551
node-2:
image: ghcr.io/sshuttle/sshuttle-testbed
container_name: sshuttle-testbed-node-2
hostname: node-2
cap_add:
- "NET_ADMIN"
environment:
- ADD_IP_ADDRESSES=10.55.2.77/32
networks:
default:
ipv6_address: 2001:0DB8::552
networks:
default:
driver: bridge
enable_ipv6: true
ipam:
config:
- subnet: 2001:0DB8::/112
# internal: true

65
scripts/container.setup.sh
View File

@ -1,65 +0,0 @@
#!/usr/bin/with-contenv bash
# shellcheck shell=bash
set -e
function with_set_x() {
set -x
"$@"
{
ec=$?
set +x
return $ec
} 2>/dev/null
}
function log() {
echo "$*" >&2
}
log ">>> Setting up $(hostname) | id: $(id)\nIP:\n$(ip a)\nRoutes:\n$(ip r)\npyenv:\n$(pyenv versions)"
echo "
AcceptEnv PYENV_VERSION
" >> /etc/ssh/sshd_config
iface="$(ip route | awk '/default/ { print $5 }')"
default_gw="$(ip route | awk '/default/ { print $3 }')"
for addr in ${ADD_IP_ADDRESSES//,/ }; do
log ">>> Adding $addr to interface $iface"
net_addr=$(ipcalc -n "$addr" | awk -F= '{print $2}')
with_set_x ip addr add "$addr" dev "$iface"
with_set_x ip route add "$net_addr" via "$default_gw" dev "$iface" # so that sshuttle -N can discover routes
done
log ">>> Starting iperf3 server"
iperf3 --server --port 5001 &
mkdir -p /www
echo "<h5>Hello from $(hostname)</h5>
<pre>
<u>ip address</u>
$(ip address)
<u>ip route</u>
$(ip route)
</pre>" >/www/index.html
echo "
daemon off;
worker_processes 1;
error_log /dev/stdout info;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
server {
access_log /dev/stdout;
listen 8080 default_server;
listen [::]:8080 default_server;
root /www;
}
}" >/etc/nginx/nginx.conf
log ">>> Starting nginx"
nginx &

159
scripts/exec-sshuttle
View File

@ -1,159 +0,0 @@
#!/usr/bin/env bash
set -e
export MSYS_NO_PATHCONV=1
function with_set_x() {
set -x
"$@"
{
ec=$?
set +x
return $ec
} 2>/dev/null
}
function log() {
echo "$*" >&2
}
ssh_cmd='ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'
ssh_copy_id=false
args=()
subnet_args=()
while [[ $# -gt 0 ]]; do
arg=$1
shift
case "$arg" in
-v|-vv*)
ssh_cmd+=" -v"
args+=("$arg")
;;
-r)
args+=("-r" "$1")
shift
;;
--copy-id)
ssh_copy_id=true
;;
--server-py=*)
server_pyenv_ver="${arg#*=}"
;;
--client-py=*)
client_pyenv_ver="${arg#*=}"
;;
-6)
ipv6_only=true
;;
--sshuttle-bin=*)
sshuttle_bin="${arg#*=}"
;;
-N|*/*)
subnet_args+=("$arg")
;;
-*)
args+=("$arg")
;;
*)
if [[ -z "$target" ]]; then
target=$arg
else
args+=("$arg")
fi
;;
esac
done
if [[ ${#subnet_args[@]} -eq 0 ]]; then
subnet_args=("-N")
fi
if [[ $target == node-* ]]; then
log "Target is a a test-bed node"
port="2222"
user_part="test:test"
host=$("$(dirname "$0")/test-bed" get-ip "$target")
index=${target#node-}
if [[ $ipv6_only == true ]]; then
args+=("2001:0DB8::/112")
else
args+=("10.55.$index.0/24")
fi
target="$user_part@$host:$port"
if ! command -v sshpass >/dev/null; then
log "sshpass is not found. You might have to manually enter ssh password: 'test'"
fi
if [[ -z $server_pyenv_ver ]]; then
log "server-py argumwnt is not specified. Setting it to 3.8"
server_pyenv_ver="3.8"
fi
fi
if [[ -n $server_pyenv_ver ]]; then
log "Would pass PYENV_VERRSION=$server_pyenv_ver to server. pyenv is required on server to make it work"
pycmd="/pyenv/shims/python"
ssh_cmd+=" -o SetEnv=PYENV_VERSION=${server_pyenv_ver:-'3'}"
args=("--python=$pycmd" "${args[@]}")
fi
if [[ $ssh_copy_id == true ]]; then
log "Trying to make it passwordless"
if [[ $target == *@* ]]; then
user_part="${target%%@*}"
host_part="${target#*@}"
else
user_part="$(whoami)"
host_part="$target"
fi
if [[ $host_part == *:* ]]; then
host="${host_part%:*}"
port="${host_part#*:}"
else
host="$host_part"
port="22"
fi
if [[ $user_part == *:* ]]; then
user="${user_part%:*}"
password="${user_part#*:}"
else
user="$user_part"
password=""
fi
cmd=(ssh-copy-id -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p "$port" "$user@$host")
if [[ -n $password ]] && command -v sshpass >/dev/null; then
cmd=(sshpass -p "$password" "${cmd[@]}")
fi
with_set_x "${cmd[@]}"
fi
if [[ -z $sshuttle_bin || "$sshuttle_bin" == dev ]]; then
cd "$(dirname "$0")/.."
export PYTHONPATH="."
if [[ -n $client_pyenv_ver ]]; then
log "Using pyenv version: $client_pyenv_ver"
command -v pyenv &>/dev/null || log "You have to install pyenv to use --client-py" && exit 1
sshuttle_cmd=(/usr/bin/env PYENV_VERSION="$client_pyenv_ver" pyenv exec python -m sshuttle)
else
log "Using best python version availble"
if [ -x "$(command -v python3)" ] &&
python3 -c "import sys; sys.exit(not sys.version_info > (3, 5))"; then
sshuttle_cmd=(python3 -m sshuttle)
else
sshuttle_cmd=(python -m sshuttle)
fi
fi
else
[[ -n $client_pyenv_ver ]] && log "Can't specify --client-py when --sshuttle-bin is specified" && exit 1
sshuttle_cmd=("$sshuttle_bin")
fi
if [[ " ${args[*]} " != *" --ssh-cmd "* ]]; then
args=("--ssh-cmd" "$ssh_cmd" "${args[@]}")
fi
if [[ " ${args[*]} " != *" -r "* ]]; then
args=("-r" "$target" "${args[@]}")
fi
set -x
"${sshuttle_cmd[@]}" --version
exec "${sshuttle_cmd[@]}" "${args[@]}" "${subnet_args[@]}"

86
scripts/exec-tool
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@ -1,86 +0,0 @@
#!/usr/bin/env bash
set -e
function with_set_x() {
set -x
"$@"
{
ec=$?
set +x
return $ec
} 2>/dev/null
}
function log() {
echo "$*" >&2
}
args=()
while [[ $# -gt 0 ]]; do
arg=$1
shift
case "$arg" in
-6)
ipv6_only=true
continue
;;
-*) ;;
*)
if [[ -z $tool ]]; then
tool=$arg
continue
elif [[ -z $node ]]; then
node=$arg
continue
fi
;;
esac
args+=("$arg")
done
tool=${tool?:"tool argument missing. should be one of iperf3,ping,curl,ab"}
node=${node?:"node argument missing. should be 'node-1' , 'node-2' etc"}
if [[ $node == node-* ]]; then
index=${node#node-}
if [[ $ipv6_only == true ]]; then
host="2001:0DB8::55$index"
else
host="10.55.$index.77"
fi
else
host=$node
fi
connect_timeout_sec=3
case "$tool" in
ping)
with_set_x exec ping -W $connect_timeout_sec "${args[@]}" "$host"
;;
iperf3)
port=5001
with_set_x exec iperf3 --client "$host" --port=$port --connect-timeout=$((connect_timeout_sec * 1000)) "${args[@]}"
;;
curl)
port=8080
if [[ $host = *:* ]]; then
host="[$host]"
args+=(--ipv6)
fi
with_set_x exec curl "http://$host:$port/" -v --connect-timeout $connect_timeout_sec "${args[@]}"
;;
ab)
port=8080
if [[ " ${args[*]}" != *" -n "* && " ${args[*]}" != *" -c "* ]]; then
args+=(-n 500 -c 50 "${args[@]}")
fi
with_set_x exec ab -s $connect_timeout_sec "${args[@]}" "http://$host:$port/"
;;
*)
log "Unknown tool: $tool"
exit 2
;;
esac

40
scripts/run-benchmark
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@ -1,40 +0,0 @@
#!/usr/bin/env bash
set -e
cd "$(dirname "$0")"
function with_set_x() {
set -x
"$@"
{
ec=$?
set +x
return $ec
} 2>/dev/null
}
function log() {
echo "$*" >&2
}
./test-bed up -d
benchmark() {
log -e "\n======== Benchmarking sshuttle | Args: [$*] ========"
local node=$1
shift
with_set_x ./exec-sshuttle "$node" --listen 55771 "$@" &
sshuttle_pid=$!
trap 'kill -0 $sshuttle_pid &>/dev/null && kill -15 $sshuttle_pid' EXIT
while ! nc -z localhost 55771; do sleep 0.1; done
sleep 1
./exec-tool iperf3 "$node" --time=4
with_set_x kill -15 $sshuttle_pid
wait $sshuttle_pid || true
}
if [[ $# -gt 0 ]]; then
benchmark "${@}"
else
benchmark node-1 --sshuttle-bin="${SSHUTTLE_BIN:-sshuttle}"
benchmark node-1 --sshuttle-bin=dev
fi

9
scripts/run-checks
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@ -1,9 +0,0 @@
#!/usr/bin/env bash
set -e
cd "$(dirname "$0")/.."
export PYTHONPATH=.
set -x
python -m flake8 sshuttle tests
python -m pytest .

42
scripts/test-bed
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@ -1,42 +0,0 @@
#!/usr/bin/env bash
set -e
cd "$(dirname "$0")"
if [[ -z $1 || $1 = -* ]]; then
set -- up "$@"
fi
function with_set_x() {
set -x
"$@"
{
ec=$?
set +x
return $ec
} 2>/dev/null
}
function build() {
# podman build -t ghcr.io/sshuttle/sshuttle-testbed .
with_set_x docker build --progress=plain -t ghcr.io/sshuttle/sshuttle-testbed -f Containerfile .
}
function compose() {
# podman-compose "$@"
with_set_x docker compose "$@"
}
function get-ip() {
local container_name=sshuttle-testbed-"$1"
docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$container_name"
}
if [[ $1 == get-ip ]]; then
shift
get-ip "$@"
else
if [[ $* = *--build* ]]; then
build
fi
compose "$@"
fi

30
setup.cfg
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@ -1,30 +0,0 @@
[bumpversion]
current_version = 1.3.1
[bumpversion:file:setup.py]
[bumpversion:file:pyproject.toml]
[bumpversion:file:sshuttle/version.py]
[aliases]
test = pytest
[bdist_wheel]
universal = 1
[upload]
sign = true
identity = 0x1784577F811F6EAC
[flake8]
count = true
show-source = true
statistics = true
max-line-length = 128
[pycodestyle]
max-line-length = 128
[tool:pytest]
addopts = --cov=sshuttle --cov-branch --cov-report=term-missing

10
src/Makefile Normal file
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@ -0,0 +1,10 @@
all:
Makefile:
@
%: FORCE
+./do $@
.PHONY: FORCE

11
src/all.do Normal file
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@ -0,0 +1,11 @@
exec >&2
UI=
[ "$(uname)" = "Darwin" ] && UI=ui-macos/all
redo-ifchange sshuttle.8 $UI
echo
echo "What now?"
[ -z "$UI" ] || echo "- Try the MacOS GUI: open ui-macos/Sshuttle*.app"
echo "- Run sshuttle: ./sshuttle --dns -r HOSTNAME 0/0"
echo "- Read the README: less README.md"
echo "- Read the man page: less sshuttle.md"

27
src/assembler.py Normal file
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@ -0,0 +1,27 @@
import sys
import zlib
z = zlib.decompressobj()
mainmod = sys.modules[__name__]
while 1:
name = sys.stdin.readline().strip()
if name:
nbytes = int(sys.stdin.readline())
if verbosity >= 2:
sys.stderr.write('server: assembling %r (%d bytes)\n'
% (name, nbytes))
content = z.decompress(sys.stdin.read(nbytes))
exec compile(content, name, "exec")
# FIXME: this crushes everything into a single module namespace,
# then makes each of the module names point at this one. Gross.
assert(name.endswith('.py'))
modname = name[:-3]
mainmod.__dict__[modname] = mainmod
else:
break
verbose = verbosity
sys.stderr.flush()
sys.stdout.flush()
main()

2
src/clean.do Normal file
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@ -0,0 +1,2 @@
redo ui-macos/clean
rm -f *~ */*~ .*~ */.*~ *.8 *.tmp */*.tmp *.pyc */*.pyc

776
src/client.py Normal file
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@ -0,0 +1,776 @@
import struct
import errno
import re
import signal
import time
import compat.ssubprocess as ssubprocess
import helpers
import os
import ssnet
import ssh
import ssyslog
import sys
from ssnet import SockWrapper, Handler, Proxy, Mux, MuxWrapper
from helpers import log, debug1, debug2, debug3, Fatal, islocal
recvmsg = None
try:
# try getting recvmsg from python
import socket as pythonsocket
getattr(pythonsocket.socket, "recvmsg")
socket = pythonsocket
recvmsg = "python"
except AttributeError:
# try getting recvmsg from socket_ext library
try:
import socket_ext
getattr(socket_ext.socket, "recvmsg")
socket = socket_ext
recvmsg = "socket_ext"
except ImportError:
import socket
_extra_fd = os.open('/dev/null', os.O_RDONLY)
def got_signal(signum, frame):
log('exiting on signal %d\n' % signum)
sys.exit(1)
_pidname = None
IP_TRANSPARENT = 19
IP_ORIGDSTADDR = 20
IP_RECVORIGDSTADDR = IP_ORIGDSTADDR
SOL_IPV6 = 41
IPV6_ORIGDSTADDR = 74
IPV6_RECVORIGDSTADDR = IPV6_ORIGDSTADDR
if recvmsg == "python":
def recv_udp(listener, bufsize):
debug3('Accept UDP python using recvmsg.\n')
data, ancdata, msg_flags, srcip = listener.recvmsg(
4096, socket.CMSG_SPACE(24))
dstip = None
family = None
for cmsg_level, cmsg_type, cmsg_data in ancdata:
if cmsg_level == socket.SOL_IP and cmsg_type == IP_ORIGDSTADDR:
family, port = struct.unpack('=HH', cmsg_data[0:4])
port = socket.htons(port)
if family == socket.AF_INET:
start = 4
length = 4
else:
raise Fatal("Unsupported socket type '%s'" % family)
ip = socket.inet_ntop(family, cmsg_data[start:start + length])
dstip = (ip, port)
break
elif cmsg_level == SOL_IPV6 and cmsg_type == IPV6_ORIGDSTADDR:
family, port = struct.unpack('=HH', cmsg_data[0:4])
port = socket.htons(port)
if family == socket.AF_INET6:
start = 8
length = 16
else:
raise Fatal("Unsupported socket type '%s'" % family)
ip = socket.inet_ntop(family, cmsg_data[start:start + length])
dstip = (ip, port)
break
return (srcip, dstip, data)
elif recvmsg == "socket_ext":
def recv_udp(listener, bufsize):
debug3('Accept UDP using socket_ext recvmsg.\n')
srcip, data, adata, flags = listener.recvmsg(
(bufsize,), socket.CMSG_SPACE(24))
dstip = None
family = None
for a in adata:
if a.cmsg_level == socket.SOL_IP and a.cmsg_type == IP_ORIGDSTADDR:
family, port = struct.unpack('=HH', a.cmsg_data[0:4])
port = socket.htons(port)
if family == socket.AF_INET:
start = 4
length = 4
else:
raise Fatal("Unsupported socket type '%s'" % family)
ip = socket.inet_ntop(
family, a.cmsg_data[start:start + length])
dstip = (ip, port)
break
elif a.cmsg_level == SOL_IPV6 and a.cmsg_type == IPV6_ORIGDSTADDR:
family, port = struct.unpack('=HH', a.cmsg_data[0:4])
port = socket.htons(port)
if family == socket.AF_INET6:
start = 8
length = 16
else:
raise Fatal("Unsupported socket type '%s'" % family)
ip = socket.inet_ntop(
family, a.cmsg_data[start:start + length])
dstip = (ip, port)
break
return (srcip, dstip, data[0])
else:
def recv_udp(listener, bufsize):
debug3('Accept UDP using recvfrom.\n')
data, srcip = listener.recvfrom(bufsize)
return (srcip, None, data)
def check_daemon(pidfile):
global _pidname
_pidname = os.path.abspath(pidfile)
try:
oldpid = open(_pidname).read(1024)
except IOError, e:
if e.errno == errno.ENOENT:
return # no pidfile, ok
else:
raise Fatal("can't read %s: %s" % (_pidname, e))
if not oldpid:
os.unlink(_pidname)
return # invalid pidfile, ok
oldpid = int(oldpid.strip() or 0)
if oldpid <= 0:
os.unlink(_pidname)
return # invalid pidfile, ok
try:
os.kill(oldpid, 0)
except OSError, e:
if e.errno == errno.ESRCH:
os.unlink(_pidname)
return # outdated pidfile, ok
elif e.errno == errno.EPERM:
pass
else:
raise
raise Fatal("%s: sshuttle is already running (pid=%d)"
% (_pidname, oldpid))
def daemonize():
if os.fork():
os._exit(0)
os.setsid()
if os.fork():
os._exit(0)
outfd = os.open(_pidname, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0666)
try:
os.write(outfd, '%d\n' % os.getpid())
finally:
os.close(outfd)
os.chdir("/")
# Normal exit when killed, or try/finally won't work and the pidfile won't
# be deleted.
signal.signal(signal.SIGTERM, got_signal)
si = open('/dev/null', 'r+')
os.dup2(si.fileno(), 0)
os.dup2(si.fileno(), 1)
si.close()
ssyslog.stderr_to_syslog()
def daemon_cleanup():
try:
os.unlink(_pidname)
except OSError, e:
if e.errno == errno.ENOENT:
pass
else:
raise
pf_command_file = None
def pf_dst(sock):
peer = sock.getpeername()
proxy = sock.getsockname()
argv = (sock.family, socket.IPPROTO_TCP, peer[0], peer[1], proxy[0], proxy[1])
pf_command_file.write("QUERY_PF_NAT %r,%r,%s,%r,%s,%r\n" % argv)
pf_command_file.flush()
line = pf_command_file.readline()
debug2("QUERY_PF_NAT %r,%r,%s,%r,%s,%r" % argv + ' > ' + line)
if line.startswith('QUERY_PF_NAT_SUCCESS '):
(ip, port) = line[21:].split(',')
return (ip, int(port))
return sock.getsockname()
def original_dst(sock):
try:
SO_ORIGINAL_DST = 80
SOCKADDR_MIN = 16
sockaddr_in = sock.getsockopt(socket.SOL_IP,
SO_ORIGINAL_DST, SOCKADDR_MIN)
(proto, port, a, b, c, d) = struct.unpack('!HHBBBB', sockaddr_in[:8])
assert(socket.htons(proto) == socket.AF_INET)
ip = '%d.%d.%d.%d' % (a, b, c, d)
return (ip, port)
except socket.error, e:
if e.args[0] == errno.ENOPROTOOPT:
return sock.getsockname()
raise
class MultiListener:
def __init__(self, type=socket.SOCK_STREAM, proto=0):
self.v6 = socket.socket(socket.AF_INET6, type, proto)
self.v4 = socket.socket(socket.AF_INET, type, proto)
def setsockopt(self, level, optname, value):
if self.v6:
self.v6.setsockopt(level, optname, value)
if self.v4:
self.v4.setsockopt(level, optname, value)
def add_handler(self, handlers, callback, method, mux):
if self.v6:
handlers.append(
Handler(
[self.v6],
lambda: callback(self.v6, method, mux, handlers)))
if self.v4:
handlers.append(
Handler(
[self.v4],
lambda: callback(self.v4, method, mux, handlers)))
def listen(self, backlog):
if self.v6:
self.v6.listen(backlog)
if self.v4:
try:
self.v4.listen(backlog)
except socket.error, e:
# on some systems v4 bind will fail if the v6 suceeded,
# in this case the v6 socket will receive v4 too.
if e.errno == errno.EADDRINUSE and self.v6:
self.v4 = None
else:
raise e
def bind(self, address_v6, address_v4):
if address_v6 and self.v6:
self.v6.bind(address_v6)
else:
self.v6 = None
if address_v4 and self.v4:
self.v4.bind(address_v4)
else:
self.v4 = None
def print_listening(self, what):
if self.v6:
listenip = self.v6.getsockname()
debug1('%s listening on %r.\n' % (what, listenip))
if self.v4:
listenip = self.v4.getsockname()
debug1('%s listening on %r.\n' % (what, listenip))
class FirewallClient:
def __init__(self, port_v6, port_v4, subnets_include, subnets_exclude,
dnsport_v6, dnsport_v4, method, udp):
self.auto_nets = []
self.subnets_include = subnets_include
self.subnets_exclude = subnets_exclude
argvbase = ([sys.argv[1], sys.argv[0], sys.argv[1]] +
['-v'] * (helpers.verbose or 0) +
['--firewall', str(port_v6), str(port_v4),
str(dnsport_v6), str(dnsport_v4),
method, str(int(udp))])
if ssyslog._p:
argvbase += ['--syslog']
argv_tries = [
['sudo', '-p', '[local sudo] Password: '] + argvbase,
['su', '-c', ' '.join(argvbase)],
argvbase
]
# we can't use stdin/stdout=subprocess.PIPE here, as we normally would,
# because stupid Linux 'su' requires that stdin be attached to a tty.
# Instead, attach a *bidirectional* socket to its stdout, and use
# that for talking in both directions.
(s1, s2) = socket.socketpair()
def setup():
# run in the child process
s2.close()
e = None
if os.getuid() == 0:
argv_tries = argv_tries[-1:] # last entry only
for argv in argv_tries:
try:
if argv[0] == 'su':
sys.stderr.write('[local su] ')
self.p = ssubprocess.Popen(argv, stdout=s1, preexec_fn=setup)
e = None
break
except OSError, e:
pass
self.argv = argv
s1.close()
self.pfile = s2.makefile('wb+')
if e:
log('Spawning firewall manager: %r\n' % self.argv)
raise Fatal(e)
line = self.pfile.readline()
self.check()
if line[0:5] != 'READY':
raise Fatal('%r expected READY, got %r' % (self.argv, line))
self.method = line[6:-1]
def check(self):
rv = self.p.poll()
if rv:
raise Fatal('%r returned %d' % (self.argv, rv))
def start(self):
self.pfile.write('ROUTES\n')
for (family, ip, width) in self.subnets_include + self.auto_nets:
self.pfile.write('%d,%d,0,%s\n' % (family, width, ip))
for (family, ip, width) in self.subnets_exclude:
self.pfile.write('%d,%d,1,%s\n' % (family, width, ip))
self.pfile.write('GO\n')
self.pfile.flush()
line = self.pfile.readline()
self.check()
if line != 'STARTED\n':
raise Fatal('%r expected STARTED, got %r' % (self.argv, line))
def sethostip(self, hostname, ip):
assert(not re.search(r'[^-\w]', hostname))
assert(not re.search(r'[^0-9.]', ip))
self.pfile.write('HOST %s,%s\n' % (hostname, ip))
self.pfile.flush()
def done(self):
self.pfile.close()
rv = self.p.wait()
if rv:
raise Fatal('cleanup: %r returned %d' % (self.argv, rv))
dnsreqs = {}
udp_by_src = {}
def expire_connections(now, mux):
for chan, timeout in dnsreqs.items():
if timeout < now:
debug3('expiring dnsreqs channel=%d\n' % chan)
del mux.channels[chan]
del dnsreqs[chan]
debug3('Remaining DNS requests: %d\n' % len(dnsreqs))
for peer, (chan, timeout) in udp_by_src.items():
if timeout < now:
debug3('expiring UDP channel channel=%d peer=%r\n' % (chan, peer))
mux.send(chan, ssnet.CMD_UDP_CLOSE, '')
del mux.channels[chan]
del udp_by_src[peer]
debug3('Remaining UDP channels: %d\n' % len(udp_by_src))
def onaccept_tcp(listener, method, mux, handlers):
global _extra_fd
try:
sock, srcip = listener.accept()
except socket.error, e:
if e.args[0] in [errno.EMFILE, errno.ENFILE]:
debug1('Rejected incoming connection: too many open files!\n')
# free up an fd so we can eat the connection
os.close(_extra_fd)
try:
sock, srcip = listener.accept()
sock.close()
finally:
_extra_fd = os.open('/dev/null', os.O_RDONLY)
return
else:
raise
if method == "tproxy":
dstip = sock.getsockname()
elif method == "pf":
dstip = pf_dst(sock)
else:
dstip = original_dst(sock)
debug1('Accept TCP: %s:%r -> %s:%r.\n' % (srcip[0], srcip[1],
dstip[0], dstip[1]))
if dstip[1] == sock.getsockname()[1] and islocal(dstip[0], sock.family):
debug1("-- ignored: that's my address!\n")
sock.close()
return
chan = mux.next_channel()
if not chan:
log('warning: too many open channels. Discarded connection.\n')
sock.close()
return
mux.send(chan, ssnet.CMD_TCP_CONNECT, '%d,%s,%s' %
(sock.family, dstip[0], dstip[1]))
outwrap = MuxWrapper(mux, chan)
handlers.append(Proxy(SockWrapper(sock, sock), outwrap))
expire_connections(time.time(), mux)
def udp_done(chan, data, method, family, dstip):
(src, srcport, data) = data.split(",", 2)
srcip = (src, int(srcport))
debug3('doing send from %r to %r\n' % (srcip, dstip,))
try:
sender = socket.socket(family, socket.SOCK_DGRAM)
sender.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sender.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
sender.bind(srcip)
sender.sendto(data, dstip)
sender.close()
except socket.error, e:
debug1('-- ignored socket error sending UDP data: %r\n' % e)
def onaccept_udp(listener, method, mux, handlers):
now = time.time()
srcip, dstip, data = recv_udp(listener, 4096)
if not dstip:
debug1(
"-- ignored UDP from %r: "
"couldn't determine destination IP address\n" % (srcip,))
return
debug1('Accept UDP: %r -> %r.\n' % (srcip, dstip,))
if srcip in udp_by_src:
chan, timeout = udp_by_src[srcip]
else:
chan = mux.next_channel()
mux.channels[chan] = lambda cmd, data: udp_done(
chan, data, method, listener.family, dstip=srcip)
mux.send(chan, ssnet.CMD_UDP_OPEN, listener.family)
udp_by_src[srcip] = chan, now + 30
hdr = "%s,%r," % (dstip[0], dstip[1])
mux.send(chan, ssnet.CMD_UDP_DATA, hdr + data)
expire_connections(now, mux)
def dns_done(chan, data, method, sock, srcip, dstip, mux):
debug3('dns_done: channel=%d src=%r dst=%r\n' % (chan, srcip, dstip))
del mux.channels[chan]
del dnsreqs[chan]
if method == "tproxy":
debug3('doing send from %r to %r\n' % (srcip, dstip,))
sender = socket.socket(sock.family, socket.SOCK_DGRAM)
sender.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sender.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
sender.bind(srcip)
sender.sendto(data, dstip)
sender.close()
else:
debug3('doing sendto %r\n' % (dstip,))
sock.sendto(data, dstip)
def ondns(listener, method, mux, handlers):
now = time.time()
srcip, dstip, data = recv_udp(listener, 4096)
if method == "tproxy" and not dstip:
debug1(
"-- ignored UDP from %r: "
"couldn't determine destination IP address\n" % (srcip,))
return
debug1('DNS request from %r to %r: %d bytes\n' % (srcip, dstip, len(data)))
chan = mux.next_channel()
dnsreqs[chan] = now + 30
mux.send(chan, ssnet.CMD_DNS_REQ, data)
mux.channels[chan] = lambda cmd, data: dns_done(
chan, data, method, listener, srcip=dstip, dstip=srcip, mux=mux)
expire_connections(now, mux)
def _main(tcp_listener, udp_listener, fw, ssh_cmd, remotename,
python, latency_control,
dns_listener, method, seed_hosts, auto_nets,
syslog, daemon):
handlers = []
if helpers.verbose >= 1:
helpers.logprefix = 'c : '
else:
helpers.logprefix = 'client: '
debug1('connecting to server...\n')
try:
(serverproc, serversock) = ssh.connect(
ssh_cmd, remotename, python,
stderr=ssyslog._p and ssyslog._p.stdin,
options=dict(latency_control=latency_control, method=method))
except socket.error, e:
if e.args[0] == errno.EPIPE:
raise Fatal("failed to establish ssh session (1)")
else:
raise
mux = Mux(serversock, serversock)
handlers.append(mux)
expected = 'SSHUTTLE0001'
try:
v = 'x'
while v and v != '\0':
v = serversock.recv(1)
v = 'x'
while v and v != '\0':
v = serversock.recv(1)
initstring = serversock.recv(len(expected))
except socket.error, e:
if e.args[0] == errno.ECONNRESET:
raise Fatal("failed to establish ssh session (2)")
else:
raise
rv = serverproc.poll()
if rv:
raise Fatal('server died with error code %d' % rv)
if initstring != expected:
raise Fatal('expected server init string %r; got %r'
% (expected, initstring))
debug1('connected.\n')
print 'Connected.'
sys.stdout.flush()
if daemon:
daemonize()
log('daemonizing (%s).\n' % _pidname)
elif syslog:
debug1('switching to syslog.\n')
ssyslog.stderr_to_syslog()
def onroutes(routestr):
if auto_nets:
for line in routestr.strip().split('\n'):
(family, ip, width) = line.split(',', 2)
fw.auto_nets.append((int(family), ip, int(width)))
# we definitely want to do this *after* starting ssh, or we might end
# up intercepting the ssh connection!
#
# Moreover, now that we have the --auto-nets option, we have to wait
# for the server to send us that message anyway. Even if we haven't
# set --auto-nets, we might as well wait for the message first, then
# ignore its contents.
mux.got_routes = None
fw.start()
mux.got_routes = onroutes
def onhostlist(hostlist):
debug2('got host list: %r\n' % hostlist)
for line in hostlist.strip().split():
if line:
name, ip = line.split(',', 1)
fw.sethostip(name, ip)
mux.got_host_list = onhostlist
tcp_listener.add_handler(handlers, onaccept_tcp, method, mux)
if udp_listener:
udp_listener.add_handler(handlers, onaccept_udp, method, mux)
if dns_listener:
dns_listener.add_handler(handlers, ondns, method, mux)
if seed_hosts is not None:
debug1('seed_hosts: %r\n' % seed_hosts)
mux.send(0, ssnet.CMD_HOST_REQ, '\n'.join(seed_hosts))
while 1:
rv = serverproc.poll()
if rv:
raise Fatal('server died with error code %d' % rv)
ssnet.runonce(handlers, mux)
if latency_control:
mux.check_fullness()
mux.callback()
def main(listenip_v6, listenip_v4,
ssh_cmd, remotename, python, latency_control, dns,
method, seed_hosts, auto_nets,
subnets_include, subnets_exclude, syslog, daemon, pidfile):
if syslog:
ssyslog.start_syslog()
if daemon:
try:
check_daemon(pidfile)
except Fatal, e:
log("%s\n" % e)
return 5
debug1('Starting sshuttle proxy.\n')
if recvmsg is not None:
debug1("recvmsg %s support enabled.\n" % recvmsg)
if method == "tproxy":
if recvmsg is not None:
debug1("tproxy UDP support enabled.\n")
udp = True
else:
debug1("tproxy UDP support requires recvmsg function.\n")
udp = False
if dns and recvmsg is None:
debug1("tproxy DNS support requires recvmsg function.\n")
dns = False
else:
debug1("UDP support requires tproxy; disabling UDP.\n")
udp = False
if listenip_v6 and listenip_v6[1] and listenip_v4 and listenip_v4[1]:
# if both ports given, no need to search for a spare port
ports = [0, ]
else:
# if at least one port missing, we have to search
ports = xrange(12300, 9000, -1)
# search for free ports and try to bind
last_e = None
redirectport_v6 = 0
redirectport_v4 = 0
bound = False
debug2('Binding redirector:')
for port in ports:
debug2(' %d' % port)
tcp_listener = MultiListener()
tcp_listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if udp:
udp_listener = MultiListener(socket.SOCK_DGRAM)
udp_listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
else:
udp_listener = None
if listenip_v6 and listenip_v6[1]:
lv6 = listenip_v6
redirectport_v6 = lv6[1]
elif listenip_v6:
lv6 = (listenip_v6[0], port)
redirectport_v6 = port
else:
lv6 = None
redirectport_v6 = 0
if listenip_v4 and listenip_v4[1]:
lv4 = listenip_v4
redirectport_v4 = lv4[1]
elif listenip_v4:
lv4 = (listenip_v4[0], port)
redirectport_v4 = port
else:
lv4 = None
redirectport_v4 = 0
try:
tcp_listener.bind(lv6, lv4)
if udp_listener:
udp_listener.bind(lv6, lv4)
bound = True
break
except socket.error, e:
if e.errno == errno.EADDRINUSE:
last_e = e
else:
raise e
debug2('\n')
if not bound:
assert(last_e)
raise last_e
tcp_listener.listen(10)
tcp_listener.print_listening("TCP redirector")
if udp_listener:
udp_listener.print_listening("UDP redirector")
bound = False
if dns:
# search for spare port for DNS
debug2('Binding DNS:')
ports = xrange(12300, 9000, -1)
for port in ports:
debug2(' %d' % port)
dns_listener = MultiListener(socket.SOCK_DGRAM)
if listenip_v6:
lv6 = (listenip_v6[0], port)
dnsport_v6 = port
else:
lv6 = None
dnsport_v6 = 0
if listenip_v4:
lv4 = (listenip_v4[0], port)
dnsport_v4 = port
else:
lv4 = None
dnsport_v4 = 0
try:
dns_listener.bind(lv6, lv4)
bound = True
break
except socket.error, e:
if e.errno == errno.EADDRINUSE:
last_e = e
else:
raise e
debug2('\n')
dns_listener.print_listening("DNS")
if not bound:
assert(last_e)
raise last_e
else:
dnsport_v6 = 0
dnsport_v4 = 0
dns_listener = None
fw = FirewallClient(redirectport_v6, redirectport_v4, subnets_include,
subnets_exclude, dnsport_v6, dnsport_v4, method, udp)
if fw.method == "tproxy":
tcp_listener.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
if udp_listener:
udp_listener.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
if udp_listener.v4 is not None:
udp_listener.v4.setsockopt(
socket.SOL_IP, IP_RECVORIGDSTADDR, 1)
if udp_listener.v6 is not None:
udp_listener.v6.setsockopt(SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
if dns_listener:
dns_listener.setsockopt(socket.SOL_IP, IP_TRANSPARENT, 1)
if dns_listener.v4 is not None:
dns_listener.v4.setsockopt(
socket.SOL_IP, IP_RECVORIGDSTADDR, 1)
if dns_listener.v6 is not None:
dns_listener.v6.setsockopt(SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
if fw.method == "pf":
global pf_command_file
pf_command_file = fw.pfile
try:
return _main(tcp_listener, udp_listener, fw, ssh_cmd, remotename,
python, latency_control, dns_listener,
fw.method, seed_hosts, auto_nets, syslog,
daemon)
finally:
try:
if daemon:
# it's not our child anymore; can't waitpid
fw.p.returncode = 0
fw.done()
finally:
if daemon:
daemon_cleanup()

0
src/compat/__init__.py Normal file
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src/compat/ssubprocess.py Normal file
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7
src/default.8.do Normal file
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exec >&2
if pandoc </dev/null 2>/dev/null; then
pandoc -s -r markdown -w man -o $3 $2.md
else
echo "Warning: pandoc not installed; can't generate manpages."
redo-always
fi

175
src/do Executable file
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#!/bin/sh
#
# A minimal alternative to djb redo that doesn't support incremental builds.
# For the full version, visit http://github.com/apenwarr/redo
#
# The author disclaims copyright to this source file and hereby places it in
# the public domain. (2010 12 14)
#
# By default, no output coloring.
green=""
bold=""
plain=""
if [ -n "$TERM" -a "$TERM" != "dumb" ] && tty <&2 >/dev/null 2>&1; then
green="$(printf '\033[32m')"
bold="$(printf '\033[1m')"
plain="$(printf '\033[m')"
fi
_dirsplit()
{
base=${1##*/}
dir=${1%$base}
}
dirname()
(
_dirsplit "$1"
dir=${dir%/}
echo "${dir:-.}"
)
_dirsplit "$0"
export REDO=$(cd "${dir:-.}" && echo "$PWD/$base")
DO_TOP=
if [ -z "$DO_BUILT" ]; then
DO_TOP=1
[ -n "$*" ] || set all # only toplevel redo has a default target
export DO_BUILT=$PWD/.do_built
: >>"$DO_BUILT"
echo "Removing previously built files..." >&2
sort -u "$DO_BUILT" | tee "$DO_BUILT.new" |
while read f; do printf "%s\0%s.did\0" "$f" "$f"; done |
xargs -0 rm -f 2>/dev/null
mv "$DO_BUILT.new" "$DO_BUILT"
DO_PATH=$DO_BUILT.dir
export PATH=$DO_PATH:$PATH
rm -rf "$DO_PATH"
mkdir "$DO_PATH"
for d in redo redo-ifchange; do
ln -s "$REDO" "$DO_PATH/$d";
done
[ -e /bin/true ] && TRUE=/bin/true || TRUE=/usr/bin/true
for d in redo-ifcreate redo-stamp redo-always; do
ln -s $TRUE "$DO_PATH/$d";
done
fi
_find_dofile_pwd()
{
dofile=default.$1.do
while :; do
dofile=default.${dofile#default.*.}
[ -e "$dofile" -o "$dofile" = default.do ] && break
done
ext=${dofile#default}
ext=${ext%.do}
base=${1%$ext}
}
_find_dofile()
{
local prefix=
while :; do
_find_dofile_pwd "$1"
[ -e "$dofile" ] && break
[ "$PWD" = "/" ] && break
target=${PWD##*/}/$target
tmp=${PWD##*/}/$tmp
prefix=${PWD##*/}/$prefix
cd ..
done
base=$prefix$base
}
_run_dofile()
{
export DO_DEPTH="$DO_DEPTH "
export REDO_TARGET=$PWD/$target
local line1
set -e
read line1 <"$PWD/$dofile"
cmd=${line1#"#!/"}
if [ "$cmd" != "$line1" ]; then
/$cmd "$PWD/$dofile" "$@" >"$tmp.tmp2"
else
:; . "$PWD/$dofile" >"$tmp.tmp2"
fi
}
_do()
{
local dir=$1 target=$2 tmp=$3
if [ ! -e "$target" ] || [ -d "$target" -a ! -e "$target.did" ]; then
printf '%sdo %s%s%s%s\n' \
"$green" "$DO_DEPTH" "$bold" "$dir$target" "$plain" >&2
echo "$PWD/$target" >>"$DO_BUILT"
dofile=$target.do
base=$target
ext=
[ -e "$target.do" ] || _find_dofile "$target"
if [ ! -e "$dofile" ]; then
echo "do: $target: no .do file" >&2
return 1
fi
[ ! -e "$DO_BUILT" ] || [ ! -d "$(dirname "$target")" ] ||
: >>"$target.did"
( _run_dofile "$target" "$base" "$tmp.tmp" )
rv=$?
if [ $rv != 0 ]; then
printf "do: %s%s\n" "$DO_DEPTH" \
"$dir$target: got exit code $rv" >&2
rm -f "$tmp.tmp" "$tmp.tmp2"
return $rv
fi
mv "$tmp.tmp" "$target" 2>/dev/null ||
! test -s "$tmp.tmp2" ||
mv "$tmp.tmp2" "$target" 2>/dev/null
rm -f "$tmp.tmp2"
else
echo "do $DO_DEPTH$target exists." >&2
fi
}
# Make corrections for directories that don't actually exist yet.
_dir_shovel()
{
local dir base
xdir=$1 xbase=$2 xbasetmp=$2
while [ ! -d "$xdir" -a -n "$xdir" ]; do
_dirsplit "${xdir%/}"
xbasetmp=${base}__$xbase
xdir=$dir xbase=$base/$xbase
echo "xbasetmp='$xbasetmp'" >&2
done
}
redo()
{
for i in "$@"; do
_dirsplit "$i"
_dir_shovel "$dir" "$base"
dir=$xdir base=$xbase basetmp=$xbasetmp
( cd "$dir" && _do "$dir" "$base" "$basetmp" ) || return 1
done
}
set -e
redo "$@"
if [ -n "$DO_TOP" ]; then
echo "Removing stamp files..." >&2
[ ! -e "$DO_BUILT" ] ||
while read f; do printf "%s.did\0" "$f"; done <"$DO_BUILT" |
xargs -0 rm -f 2>/dev/null
fi

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src/firewall.py Normal file
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import errno
import socket
import select
import signal
import struct
import compat.ssubprocess as ssubprocess
import ssyslog
import sys
import os
import re
from helpers import log, debug1, debug3, islocal, Fatal, family_to_string, \
resolvconf_nameservers
from fcntl import ioctl
from ctypes import c_char, c_uint8, c_uint16, c_uint32, Union, Structure, \
sizeof, addressof, memmove
# python doesn't have a definition for this
IPPROTO_DIVERT = 254
def nonfatal(func, *args):
try:
func(*args)
except Fatal, e:
log('error: %s\n' % e)
def ipt_chain_exists(family, table, name):
if family == socket.AF_INET6:
cmd = 'ip6tables'
elif family == socket.AF_INET:
cmd = 'iptables'
else:
raise Exception('Unsupported family "%s"' % family_to_string(family))
argv = [cmd, '-t', table, '-nL']
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
for line in p.stdout:
if line.startswith('Chain %s ' % name):
return True
rv = p.wait()
if rv:
raise Fatal('%r returned %d' % (argv, rv))
def _ipt(family, table, *args):
if family == socket.AF_INET6:
argv = ['ip6tables', '-t', table] + list(args)
elif family == socket.AF_INET:
argv = ['iptables', '-t', table] + list(args)
else:
raise Exception('Unsupported family "%s"' % family_to_string(family))
debug1('>> %s\n' % ' '.join(argv))
rv = ssubprocess.call(argv)
if rv:
raise Fatal('%r returned %d' % (argv, rv))
_no_ttl_module = False
def _ipt_ttl(family, *args):
global _no_ttl_module
if not _no_ttl_module:
# we avoid infinite loops by generating server-side connections
# with ttl 42. This makes the client side not recapture those
# connections, in case client == server.
try:
argsplus = list(args) + ['-m', 'ttl', '!', '--ttl', '42']
_ipt(family, *argsplus)
except Fatal:
_ipt(family, *args)
# we only get here if the non-ttl attempt succeeds
log('sshuttle: warning: your iptables is missing '
'the ttl module.\n')
_no_ttl_module = True
else:
_ipt(family, *args)
# We name the chain based on the transproxy port number so that it's possible
# to run multiple copies of sshuttle at the same time. Of course, the
# multiple copies shouldn't have overlapping subnets, or only the most-
# recently-started one will win (because we use "-I OUTPUT 1" instead of
# "-A OUTPUT").
def do_iptables_nat(port, dnsport, family, subnets, udp):
# only ipv4 supported with NAT
if family != socket.AF_INET:
raise Exception(
'Address family "%s" unsupported by nat method'
% family_to_string(family))
if udp:
raise Exception("UDP not supported by nat method")
table = "nat"
def ipt(*args):
return _ipt(family, table, *args)
def ipt_ttl(*args):
return _ipt_ttl(family, table, *args)
chain = 'sshuttle-%s' % port
# basic cleanup/setup of chains
if ipt_chain_exists(family, table, chain):
nonfatal(ipt, '-D', 'OUTPUT', '-j', chain)
nonfatal(ipt, '-D', 'PREROUTING', '-j', chain)
nonfatal(ipt, '-F', chain)
ipt('-X', chain)
if subnets or dnsport:
ipt('-N', chain)
ipt('-F', chain)
ipt('-I', 'OUTPUT', '1', '-j', chain)
ipt('-I', 'PREROUTING', '1', '-j', chain)
if subnets:
# create new subnet entries. Note that we're sorting in a very
# particular order: we need to go from most-specific (largest swidth)
# to least-specific, and at any given level of specificity, we want
# excludes to come first. That's why the columns are in such a non-
# intuitive order.
for f, swidth, sexclude, snet \
in sorted(subnets, key=lambda s: s[1], reverse=True):
if sexclude:
ipt('-A', chain, '-j', 'RETURN',
'--dest', '%s/%s' % (snet, swidth),
'-p', 'tcp')
else:
ipt_ttl('-A', chain, '-j', 'REDIRECT',
'--dest', '%s/%s' % (snet, swidth),
'-p', 'tcp',
'--to-ports', str(port))
if dnsport:
nslist = resolvconf_nameservers()
for f, ip in filter(lambda i: i[0] == family, nslist):
ipt_ttl('-A', chain, '-j', 'REDIRECT',
'--dest', '%s/32' % ip,
'-p', 'udp',
'--dport', '53',
'--to-ports', str(dnsport))
def do_iptables_tproxy(port, dnsport, family, subnets, udp):
if family not in [socket.AF_INET, socket.AF_INET6]:
raise Exception(
'Address family "%s" unsupported by tproxy method'
% family_to_string(family))
table = "mangle"
def ipt(*args):
return _ipt(family, table, *args)
def ipt_ttl(*args):
return _ipt_ttl(family, table, *args)
mark_chain = 'sshuttle-m-%s' % port
tproxy_chain = 'sshuttle-t-%s' % port
divert_chain = 'sshuttle-d-%s' % port
# basic cleanup/setup of chains
if ipt_chain_exists(family, table, mark_chain):
ipt('-D', 'OUTPUT', '-j', mark_chain)
ipt('-F', mark_chain)
ipt('-X', mark_chain)
if ipt_chain_exists(family, table, tproxy_chain):
ipt('-D', 'PREROUTING', '-j', tproxy_chain)
ipt('-F', tproxy_chain)
ipt('-X', tproxy_chain)
if ipt_chain_exists(family, table, divert_chain):
ipt('-F', divert_chain)
ipt('-X', divert_chain)
if subnets or dnsport:
ipt('-N', mark_chain)
ipt('-F', mark_chain)
ipt('-N', divert_chain)
ipt('-F', divert_chain)
ipt('-N', tproxy_chain)
ipt('-F', tproxy_chain)
ipt('-I', 'OUTPUT', '1', '-j', mark_chain)
ipt('-I', 'PREROUTING', '1', '-j', tproxy_chain)
ipt('-A', divert_chain, '-j', 'MARK', '--set-mark', '1')
ipt('-A', divert_chain, '-j', 'ACCEPT')
ipt('-A', tproxy_chain, '-m', 'socket', '-j', divert_chain,
'-m', 'tcp', '-p', 'tcp')
if subnets and udp:
ipt('-A', tproxy_chain, '-m', 'socket', '-j', divert_chain,
'-m', 'udp', '-p', 'udp')
if dnsport:
nslist = resolvconf_nameservers()
for f, ip in filter(lambda i: i[0] == family, nslist):
ipt('-A', mark_chain, '-j', 'MARK', '--set-mark', '1',
'--dest', '%s/32' % ip,
'-m', 'udp', '-p', 'udp', '--dport', '53')
ipt('-A', tproxy_chain, '-j', 'TPROXY', '--tproxy-mark', '0x1/0x1',
'--dest', '%s/32' % ip,
'-m', 'udp', '-p', 'udp', '--dport', '53',
'--on-port', str(dnsport))
if subnets:
for f, swidth, sexclude, snet \
in sorted(subnets, key=lambda s: s[1], reverse=True):
if sexclude:
ipt('-A', mark_chain, '-j', 'RETURN',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'tcp', '-p', 'tcp')
ipt('-A', tproxy_chain, '-j', 'RETURN',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'tcp', '-p', 'tcp')
else:
ipt('-A', mark_chain, '-j', 'MARK',
'--set-mark', '1',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'tcp', '-p', 'tcp')
ipt('-A', tproxy_chain, '-j', 'TPROXY',
'--tproxy-mark', '0x1/0x1',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'tcp', '-p', 'tcp',
'--on-port', str(port))
if sexclude and udp:
ipt('-A', mark_chain, '-j', 'RETURN',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'udp', '-p', 'udp')
ipt('-A', tproxy_chain, '-j', 'RETURN',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'udp', '-p', 'udp')
elif udp:
ipt('-A', mark_chain, '-j', 'MARK',
'--set-mark', '1',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'udp', '-p', 'udp')
ipt('-A', tproxy_chain, '-j', 'TPROXY',
'--tproxy-mark', '0x1/0x1',
'--dest', '%s/%s' % (snet, swidth),
'-m', 'udp', '-p', 'udp',
'--on-port', str(port))
def ipfw_rule_exists(n):
argv = ['ipfw', 'list']
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
found = False
for line in p.stdout:
if line.startswith('%05d ' % n):
if not ('ipttl 42' in line
or ('skipto %d' % (n + 1)) in line
or 'check-state' in line):
log('non-sshuttle ipfw rule: %r\n' % line.strip())
raise Fatal('non-sshuttle ipfw rule #%d already exists!' % n)
found = True
rv = p.wait()
if rv:
raise Fatal('%r returned %d' % (argv, rv))
return found
_oldctls = {}
def _fill_oldctls(prefix):
argv = ['sysctl', prefix]
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
for line in p.stdout:
assert(line[-1] == '\n')
(k, v) = line[:-1].split(': ', 1)
_oldctls[k] = v
rv = p.wait()
if rv:
raise Fatal('%r returned %d' % (argv, rv))
if not line:
raise Fatal('%r returned no data' % (argv,))
def _sysctl_set(name, val):
argv = ['sysctl', '-w', '%s=%s' % (name, val)]
debug1('>> %s\n' % ' '.join(argv))
return ssubprocess.call(argv, stdout=open('/dev/null', 'w'))
_changedctls = []
def sysctl_set(name, val, permanent=False):
PREFIX = 'net.inet.ip'
assert(name.startswith(PREFIX + '.'))
val = str(val)
if not _oldctls:
_fill_oldctls(PREFIX)
if not (name in _oldctls):
debug1('>> No such sysctl: %r\n' % name)
return False
oldval = _oldctls[name]
if val != oldval:
rv = _sysctl_set(name, val)
if rv == 0 and permanent:
debug1('>> ...saving permanently in /etc/sysctl.conf\n')
f = open('/etc/sysctl.conf', 'a')
f.write('\n'
'# Added by sshuttle\n'
'%s=%s\n' % (name, val))
f.close()
else:
_changedctls.append(name)
return True
def _udp_unpack(p):
src = (socket.inet_ntoa(p[12:16]), struct.unpack('!H', p[20:22])[0])
dst = (socket.inet_ntoa(p[16:20]), struct.unpack('!H', p[22:24])[0])
return src, dst
def _udp_repack(p, src, dst):
addrs = socket.inet_aton(src[0]) + socket.inet_aton(dst[0])
ports = struct.pack('!HH', src[1], dst[1])
return p[:12] + addrs + ports + p[24:]
_real_dns_server = [None]
def _handle_diversion(divertsock, dnsport):
p, tag = divertsock.recvfrom(4096)
src, dst = _udp_unpack(p)
debug3('got diverted packet from %r to %r\n' % (src, dst))
if dst[1] == 53:
# outgoing DNS
debug3('...packet is a DNS request.\n')
_real_dns_server[0] = dst
dst = ('127.0.0.1', dnsport)
elif src[1] == dnsport:
if islocal(src[0], divertsock.family):
debug3('...packet is a DNS response.\n')
src = _real_dns_server[0]
else:
log('weird?! unexpected divert from %r to %r\n' % (src, dst))
assert(0)
newp = _udp_repack(p, src, dst)
divertsock.sendto(newp, tag)
def ipfw(*args):
argv = ['ipfw', '-q'] + list(args)
debug1('>> %s\n' % ' '.join(argv))
rv = ssubprocess.call(argv)
if rv:
raise Fatal('%r returned %d' % (argv, rv))
def do_ipfw(port, dnsport, family, subnets, udp):
# IPv6 not supported
if family not in [socket.AF_INET, ]:
raise Exception(
'Address family "%s" unsupported by ipfw method'
% family_to_string(family))
if udp:
raise Exception("UDP not supported by ipfw method")
sport = str(port)
xsport = str(port + 1)
# cleanup any existing rules
if ipfw_rule_exists(port):
ipfw('delete', sport)
while _changedctls:
name = _changedctls.pop()
oldval = _oldctls[name]
_sysctl_set(name, oldval)
if subnets or dnsport:
sysctl_set('net.inet.ip.fw.enable', 1)
changed = sysctl_set('net.inet.ip.scopedroute', 0, permanent=True)
if changed:
log("\n"
" WARNING: ONE-TIME NETWORK DISRUPTION:\n"
" =====================================\n"
"sshuttle has changed a MacOS kernel setting to work around\n"
"a bug in MacOS 10.6. This will cause your network to drop\n"
"within 5-10 minutes unless you restart your network\n"
"interface (change wireless networks or unplug/plug the\n"
"ethernet port) NOW, then restart sshuttle. The fix is\n"
"permanent; you only have to do this once.\n\n")
sys.exit(1)
ipfw('add', sport, 'check-state', 'ip',
'from', 'any', 'to', 'any')
if subnets:
# create new subnet entries
for f, swidth, sexclude, snet \
in sorted(subnets, key=lambda s: s[1], reverse=True):
if sexclude:
ipfw('add', sport, 'skipto', xsport,
'tcp',
'from', 'any', 'to', '%s/%s' % (snet, swidth))
else:
ipfw('add', sport, 'fwd', '127.0.0.1,%d' % port,
'tcp',
'from', 'any', 'to', '%s/%s' % (snet, swidth),
'not', 'ipttl', '42', 'keep-state', 'setup')
# This part is much crazier than it is on Linux, because MacOS (at least
# 10.6, and probably other versions, and maybe FreeBSD too) doesn't
# correctly fixup the dstip/dstport for UDP packets when it puts them
# through a 'fwd' rule. It also doesn't fixup the srcip/srcport in the
# response packet. In Linux iptables, all that happens magically for us,
# so we just redirect the packets and relax.
#
# On MacOS, we have to fix the ports ourselves. For that, we use a
# 'divert' socket, which receives raw packets and lets us mangle them.
#
# Here's how it works. Let's say the local DNS server is 1.1.1.1:53,
# and the remote DNS server is 2.2.2.2:53, and the local transproxy port
# is 10.0.0.1:12300, and a client machine is making a request from
# 10.0.0.5:9999. We see a packet like this:
# 10.0.0.5:9999 -> 1.1.1.1:53
# Since the destip:port matches one of our local nameservers, it will
# match a 'fwd' rule, thus grabbing it on the local machine. However,
# the local kernel will then see a packet addressed to *:53 and
# not know what to do with it; there's nobody listening on port 53. Thus,
# we divert it, rewriting it into this:
# 10.0.0.5:9999 -> 10.0.0.1:12300
# This gets proxied out to the server, which sends it to 2.2.2.2:53,
# and the answer comes back, and the proxy sends it back out like this:
# 10.0.0.1:12300 -> 10.0.0.5:9999
# But that's wrong! The original machine expected an answer from
# 1.1.1.1:53, so we have to divert the *answer* and rewrite it:
# 1.1.1.1:53 -> 10.0.0.5:9999
#
# See? Easy stuff.
if dnsport:
divertsock = socket.socket(socket.AF_INET, socket.SOCK_RAW,
IPPROTO_DIVERT)
divertsock.bind(('0.0.0.0', port)) # IP field is ignored
nslist = resolvconf_nameservers()
for f, ip in filter(lambda i: i[0] == family, nslist):
# relabel and then catch outgoing DNS requests
ipfw('add', sport, 'divert', sport,
'udp',
'from', 'any', 'to', '%s/32' % ip, '53',
'not', 'ipttl', '42')
# relabel DNS responses
ipfw('add', sport, 'divert', sport,
'udp',
'from', 'any', str(dnsport), 'to', 'any',
'not', 'ipttl', '42')
def do_wait():
while 1:
r, w, x = select.select([sys.stdin, divertsock], [], [])
if divertsock in r:
_handle_diversion(divertsock, dnsport)
if sys.stdin in r:
return
else:
do_wait = None
return do_wait
def pfctl(args, stdin = None):
argv = ['pfctl'] + list(args.split(" "))
debug1('>> %s\n' % ' '.join(argv))
p = ssubprocess.Popen(argv, stdin = ssubprocess.PIPE,
stdout = ssubprocess.PIPE,
stderr = ssubprocess.PIPE)
o = p.communicate(stdin)
if p.returncode:
raise Fatal('%r returned %d' % (argv, p.returncode))
return o
_pf_context = {'started_by_sshuttle': False, 'Xtoken':''}
def do_pf(port, dnsport, family, subnets, udp):
global _pf_started_by_sshuttle
tables = []
translating_rules = []
filtering_rules = []
if subnets:
includes=[]
# If a given subnet is both included and excluded, list the exclusion
# first; the table will ignore the second, opposite definition
for f, swidth, sexclude, snet \
in sorted(subnets, key=lambda s: (s[1], s[2]), reverse=True):
includes.append("%s%s/%s" % ("!" if sexclude else "", snet, swidth))
tables.append('table <forward_subnets> {%s}' % ','.join(includes))
translating_rules.append('rdr pass on lo0 proto tcp to <forward_subnets> -> 127.0.0.1 port %r' % port)
filtering_rules.append('pass out route-to lo0 inet proto tcp to <forward_subnets> keep state')
if dnsport:
nslist = resolvconf_nameservers()
tables.append('table <dns_servers> {%s}' % ','.join([ns[1] for ns in nslist]))
translating_rules.append('rdr pass on lo0 proto udp to <dns_servers> port 53 -> 127.0.0.1 port %r' % dnsport)
filtering_rules.append('pass out route-to lo0 inet proto udp to <dns_servers> port 53 keep state')
rules = '\n'.join(tables + translating_rules + filtering_rules) + '\n'
pf_status = pfctl('-s all')[0]
if not '\nrdr-anchor "sshuttle" all\n' in pf_status:
pf_add_anchor_rule(PF_RDR, "sshuttle")
if not '\nanchor "sshuttle" all\n' in pf_status:
pf_add_anchor_rule(PF_PASS, "sshuttle")
pfctl('-a sshuttle -f /dev/stdin', rules)
if sys.platform == "darwin":
o = pfctl('-E')
_pf_context['Xtoken'] = re.search(r'Token : (.+)', o[1]).group(1)
elif 'INFO:\nStatus: Disabled' in pf_status:
pfctl('-e')
_pf_context['started_by_sshuttle'] = True
else:
pfctl('-a sshuttle -F all')
if sys.platform == "darwin":
pfctl('-X %s' % _pf_context['Xtoken'])
elif _pf_context['started_by_sshuttle']:
pfctl('-d')
def program_exists(name):
paths = (os.getenv('PATH') or os.defpath).split(os.pathsep)
for p in paths:
fn = '%s/%s' % (p, name)
if os.path.exists(fn):
return not os.path.isdir(fn) and os.access(fn, os.X_OK)
hostmap = {}
def rewrite_etc_hosts(port):
HOSTSFILE = '/etc/hosts'
BAKFILE = '%s.sbak' % HOSTSFILE
APPEND = '# sshuttle-firewall-%d AUTOCREATED' % port
old_content = ''
st = None
try:
old_content = open(HOSTSFILE).read()
st = os.stat(HOSTSFILE)
except IOError, e:
if e.errno == errno.ENOENT:
pass
else:
raise
if old_content.strip() and not os.path.exists(BAKFILE):
os.link(HOSTSFILE, BAKFILE)
tmpname = "%s.%d.tmp" % (HOSTSFILE, port)
f = open(tmpname, 'w')
for line in old_content.rstrip().split('\n'):
if line.find(APPEND) >= 0:
continue
f.write('%s\n' % line)
for (name, ip) in sorted(hostmap.items()):
f.write('%-30s %s\n' % ('%s %s' % (ip, name), APPEND))
f.close()
if st:
os.chown(tmpname, st.st_uid, st.st_gid)
os.chmod(tmpname, st.st_mode)
else:
os.chown(tmpname, 0, 0)
os.chmod(tmpname, 0644)
os.rename(tmpname, HOSTSFILE)
def restore_etc_hosts(port):
global hostmap
hostmap = {}
rewrite_etc_hosts(port)
# This are some classes and functions used to support pf in yosemite.
class pf_state_xport(Union):
_fields_ = [("port", c_uint16),
("call_id", c_uint16),
("spi", c_uint32)]
class pf_addr(Structure):
class _pfa(Union):
_fields_ = [("v4", c_uint32), # struct in_addr
("v6", c_uint32 * 4), # struct in6_addr
("addr8", c_uint8 * 16),
("addr16", c_uint16 * 8),
("addr32", c_uint32 * 4)]
_fields_ = [("pfa", _pfa)]
_anonymous_ = ("pfa",)
class pfioc_natlook(Structure):
_fields_ = [("saddr", pf_addr),
("daddr", pf_addr),
("rsaddr", pf_addr),
("rdaddr", pf_addr),
("sxport", pf_state_xport),
("dxport", pf_state_xport),
("rsxport", pf_state_xport),
("rdxport", pf_state_xport),
("af", c_uint8), # sa_family_t
("proto", c_uint8),
("proto_variant", c_uint8),
("direction", c_uint8)]
pfioc_rule = c_char * 3104 # sizeof(struct pfioc_rule)
pfioc_pooladdr = c_char * 1136 # sizeof(struct pfioc_pooladdr)
MAXPATHLEN = 1024
DIOCNATLOOK = ((0x40000000L | 0x80000000L) | ((sizeof(pfioc_natlook) & 0x1fff) << 16) | ((ord('D')) << 8) | (23))
DIOCCHANGERULE = ((0x40000000L | 0x80000000L) | ((sizeof(pfioc_rule) & 0x1fff) << 16) | ((ord('D')) << 8) | (26))
DIOCBEGINADDRS = ((0x40000000L | 0x80000000L) | ((sizeof(pfioc_pooladdr) & 0x1fff) << 16) | ((ord('D')) << 8) | (51))
PF_CHANGE_ADD_TAIL = 2
PF_CHANGE_GET_TICKET = 6
PF_PASS = 0
PF_RDR = 8
PF_OUT = 2
_pf_fd = None
def pf_get_dev():
global _pf_fd
if _pf_fd == None:
_pf_fd = os.open('/dev/pf', os.O_RDWR)
return _pf_fd
def pf_query_nat(family, proto, src_ip, src_port, dst_ip, dst_port):
[proto, family, src_port, dst_port] = [int(v) for v in [proto, family, src_port, dst_port]]
length = 4 if family == socket.AF_INET else 16
pnl = pfioc_natlook()
pnl.proto = proto
pnl.direction = PF_OUT
pnl.af = family
memmove(addressof(pnl.saddr), socket.inet_pton(pnl.af, src_ip), length)
pnl.sxport.port = socket.htons(src_port)
memmove(addressof(pnl.daddr), socket.inet_pton(pnl.af, dst_ip), length)
pnl.dxport.port = socket.htons(dst_port)
ioctl(pf_get_dev(), DIOCNATLOOK, (c_char * sizeof(pnl)).from_address(addressof(pnl)))
ip = socket.inet_ntop(pnl.af, (c_char * length).from_address(addressof(pnl.rdaddr)))
port = socket.ntohs(pnl.rdxport.port)
return (ip, port)
def pf_add_anchor_rule(type, name):
ACTION_OFFSET = 0
POOL_TICKET_OFFSET = 8
ANCHOR_CALL_OFFSET = 1040
RULE_ACTION_OFFSET = 3068
pr = pfioc_rule()
ppa = pfioc_pooladdr()
ioctl(pf_get_dev(), DIOCBEGINADDRS, ppa)
memmove(addressof(pr) + POOL_TICKET_OFFSET, ppa[4:8], 4) #pool_ticket
memmove(addressof(pr) + ANCHOR_CALL_OFFSET, name, min(MAXPATHLEN, len(name))) #anchor_call = name
memmove(addressof(pr) + RULE_ACTION_OFFSET, struct.pack('I', type), 4) #rule.action = type
memmove(addressof(pr) + ACTION_OFFSET, struct.pack('I', PF_CHANGE_GET_TICKET), 4) #action = PF_CHANGE_GET_TICKET
ioctl(pf_get_dev(), DIOCCHANGERULE, pr)
memmove(addressof(pr) + ACTION_OFFSET, struct.pack('I', PF_CHANGE_ADD_TAIL), 4) #action = PF_CHANGE_ADD_TAIL
ioctl(pf_get_dev(), DIOCCHANGERULE, pr)
# This is some voodoo for setting up the kernel's transparent
# proxying stuff. If subnets is empty, we just delete our sshuttle rules;
# otherwise we delete it, then make them from scratch.
#
# This code is supposed to clean up after itself by deleting its rules on
# exit. In case that fails, it's not the end of the world; future runs will
# supercede it in the transproxy list, at least, so the leftover rules
# are hopefully harmless.
def main(port_v6, port_v4, dnsport_v6, dnsport_v4, method, udp, syslog):
assert(port_v6 >= 0)
assert(port_v6 <= 65535)
assert(port_v4 >= 0)
assert(port_v4 <= 65535)
assert(dnsport_v6 >= 0)
assert(dnsport_v6 <= 65535)
assert(dnsport_v4 >= 0)
assert(dnsport_v4 <= 65535)
if os.getuid() != 0:
raise Fatal('you must be root (or enable su/sudo) to set the firewall')
if method == "auto":
if program_exists('ipfw'):
method = "ipfw"
elif program_exists('iptables'):
method = "nat"
elif program_exists('pfctl'):
method = "pf"
else:
raise Fatal("can't find either ipfw, iptables or pfctl; check your PATH")
if method == "nat":
do_it = do_iptables_nat
elif method == "tproxy":
do_it = do_iptables_tproxy
elif method == "ipfw":
do_it = do_ipfw
elif method == "pf":
do_it = do_pf
else:
raise Exception('Unknown method "%s"' % method)
# because of limitations of the 'su' command, the *real* stdin/stdout
# are both attached to stdout initially. Clone stdout into stdin so we
# can read from it.
os.dup2(1, 0)
if syslog:
ssyslog.start_syslog()
ssyslog.stderr_to_syslog()
debug1('firewall manager ready method %s.\n' % method)
sys.stdout.write('READY %s\n' % method)
sys.stdout.flush()
# don't disappear if our controlling terminal or stdout/stderr
# disappears; we still have to clean up.
signal.signal(signal.SIGHUP, signal.SIG_IGN)
signal.signal(signal.SIGPIPE, signal.SIG_IGN)
signal.signal(signal.SIGTERM, signal.SIG_IGN)
signal.signal(signal.SIGINT, signal.SIG_IGN)
# ctrl-c shouldn't be passed along to me. When the main sshuttle dies,
# I'll die automatically.
os.setsid()
# we wait until we get some input before creating the rules. That way,
# sshuttle can launch us as early as possible (and get sudo password
# authentication as early in the startup process as possible).
line = sys.stdin.readline(128)
if not line:
return # parent died; nothing to do
subnets = []
if line != 'ROUTES\n':
raise Fatal('firewall: expected ROUTES but got %r' % line)
while 1:
line = sys.stdin.readline(128)
if not line:
raise Fatal('firewall: expected route but got %r' % line)
elif line == 'GO\n':
break
try:
(family, width, exclude, ip) = line.strip().split(',', 3)
except:
raise Fatal('firewall: expected route or GO but got %r' % line)
subnets.append((int(family), int(width), bool(int(exclude)), ip))
try:
if line:
debug1('firewall manager: starting transproxy.\n')
subnets_v6 = filter(lambda i: i[0] == socket.AF_INET6, subnets)
if port_v6:
do_wait = do_it(
port_v6, dnsport_v6, socket.AF_INET6, subnets_v6, udp)
elif len(subnets_v6) > 0:
debug1("IPv6 subnets defined but IPv6 disabled\n")
subnets_v4 = filter(lambda i: i[0] == socket.AF_INET, subnets)
if port_v4:
do_wait = do_it(
port_v4, dnsport_v4, socket.AF_INET, subnets_v4, udp)
elif len(subnets_v4) > 0:
debug1('IPv4 subnets defined but IPv4 disabled\n')
sys.stdout.write('STARTED\n')
try:
sys.stdout.flush()
except IOError:
# the parent process died for some reason; he's surely been loud
# enough, so no reason to report another error
return
# Now we wait until EOF or any other kind of exception. We need
# to stay running so that we don't need a *second* password
# authentication at shutdown time - that cleanup is important!
while 1:
if do_wait:
do_wait()
line = sys.stdin.readline(128)
if line.startswith('HOST '):
(name, ip) = line[5:].strip().split(',', 1)
hostmap[name] = ip
rewrite_etc_hosts(port_v6 or port_v4)
elif line.startswith('QUERY_PF_NAT '):
try:
dst = pf_query_nat(*(line[13:].split(',')))
sys.stdout.write('QUERY_PF_NAT_SUCCESS %s,%r\n' % dst)
except IOError, e:
sys.stdout.write('QUERY_PF_NAT_FAILURE %s\n' % e)
sys.stdout.flush()
elif line:
raise Fatal('expected EOF, got %r' % line)
else:
break
finally:
try:
debug1('firewall manager: undoing changes.\n')
except:
pass
if port_v6:
do_it(port_v6, 0, socket.AF_INET6, [], udp)
if port_v4:
do_it(port_v4, 0, socket.AF_INET, [], udp)
restore_etc_hosts(port_v6 or port_v4)

91
src/helpers.py Normal file
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import sys
import socket
import errno
logprefix = ''
verbose = 0
def log(s):
try:
sys.stdout.flush()
sys.stderr.write(logprefix + s)
sys.stderr.flush()
except IOError:
# this could happen if stderr gets forcibly disconnected, eg. because
# our tty closes. That sucks, but it's no reason to abort the program.
pass
def debug1(s):
if verbose >= 1:
log(s)
def debug2(s):
if verbose >= 2:
log(s)
def debug3(s):
if verbose >= 3:
log(s)
class Fatal(Exception):
pass
def list_contains_any(l, sub):
for i in sub:
if i in l:
return True
return False
def resolvconf_nameservers():
l = []
for line in open('/etc/resolv.conf'):
words = line.lower().split()
if len(words) >= 2 and words[0] == 'nameserver':
if ':' in words[1]:
l.append((socket.AF_INET6, words[1]))
else:
l.append((socket.AF_INET, words[1]))
return l
def resolvconf_random_nameserver():
l = resolvconf_nameservers()
if l:
if len(l) > 1:
# don't import this unless we really need it
import random
random.shuffle(l)
return l[0]
else:
return (socket.AF_INET, '127.0.0.1')
def islocal(ip, family):
sock = socket.socket(family)
try:
try:
sock.bind((ip, 0))
except socket.error, e:
if e.args[0] == errno.EADDRNOTAVAIL:
return False # not a local IP
else:
raise
finally:
sock.close()
return True # it's a local IP, or there would have been an error
def family_to_string(family):
if family == socket.AF_INET6:
return "AF_INET6"
elif family == socket.AF_INET:
return "AF_INET"
else:
return str(family)

287
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import time
import socket
import re
import select
import errno
import os
import sys
if not globals().get('skip_imports'):
import compat.ssubprocess as ssubprocess
import helpers
from helpers import log, debug1, debug2, debug3
POLL_TIME = 60 * 15
NETSTAT_POLL_TIME = 30
CACHEFILE = os.path.expanduser('~/.sshuttle.hosts')
_nmb_ok = True
_smb_ok = True
hostnames = {}
queue = {}
try:
null = open('/dev/null', 'wb')
except IOError, e:
log('warning: %s\n' % e)
null = os.popen("sh -c 'while read x; do :; done'", 'wb', 4096)
def _is_ip(s):
return re.match(r'\d+\.\d+\.\d+\.\d+$', s)
def write_host_cache():
tmpname = '%s.%d.tmp' % (CACHEFILE, os.getpid())
try:
f = open(tmpname, 'wb')
for name, ip in sorted(hostnames.items()):
f.write('%s,%s\n' % (name, ip))
f.close()
os.rename(tmpname, CACHEFILE)
finally:
try:
os.unlink(tmpname)
except:
pass
def read_host_cache():
try:
f = open(CACHEFILE)
except IOError, e:
if e.errno == errno.ENOENT:
return
else:
raise
for line in f:
words = line.strip().split(',')
if len(words) == 2:
(name, ip) = words
name = re.sub(r'[^-\w]', '-', name).strip()
ip = re.sub(r'[^0-9.]', '', ip).strip()
if name and ip:
found_host(name, ip)
def found_host(hostname, ip):
hostname = re.sub(r'\..*', '', hostname)
hostname = re.sub(r'[^-\w]', '_', hostname)
if (ip.startswith('127.') or ip.startswith('255.')
or hostname == 'localhost'):
return
oldip = hostnames.get(hostname)
if oldip != ip:
hostnames[hostname] = ip
debug1('Found: %s: %s\n' % (hostname, ip))
sys.stdout.write('%s,%s\n' % (hostname, ip))
write_host_cache()
def _check_etc_hosts():
debug2(' > hosts\n')
for line in open('/etc/hosts'):
line = re.sub(r'#.*', '', line)
words = line.strip().split()
if not words:
continue
ip = words[0]
names = words[1:]
if _is_ip(ip):
debug3('< %s %r\n' % (ip, names))
for n in names:
check_host(n)
found_host(n, ip)
def _check_revdns(ip):
debug2(' > rev: %s\n' % ip)
try:
r = socket.gethostbyaddr(ip)
debug3('< %s\n' % r[0])
check_host(r[0])
found_host(r[0], ip)
except socket.herror:
pass
def _check_dns(hostname):
debug2(' > dns: %s\n' % hostname)
try:
ip = socket.gethostbyname(hostname)
debug3('< %s\n' % ip)
check_host(ip)
found_host(hostname, ip)
except socket.gaierror:
pass
def _check_netstat():
debug2(' > netstat\n')
argv = ['netstat', '-n']
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
content = p.stdout.read()
p.wait()
except OSError, e:
log('%r failed: %r\n' % (argv, e))
return
for ip in re.findall(r'\d+\.\d+\.\d+\.\d+', content):
debug3('< %s\n' % ip)
check_host(ip)
def _check_smb(hostname):
return
global _smb_ok
if not _smb_ok:
return
argv = ['smbclient', '-U', '%', '-L', hostname]
debug2(' > smb: %s\n' % hostname)
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
lines = p.stdout.readlines()
p.wait()
except OSError, e:
log('%r failed: %r\n' % (argv, e))
_smb_ok = False
return
lines.reverse()
# junk at top
while lines:
line = lines.pop().strip()
if re.match(r'Server\s+', line):
break
# server list section:
# Server Comment
# ------ -------
while lines:
line = lines.pop().strip()
if not line or re.match(r'-+\s+-+', line):
continue
if re.match(r'Workgroup\s+Master', line):
break
words = line.split()
hostname = words[0].lower()
debug3('< %s\n' % hostname)
check_host(hostname)
# workgroup list section:
# Workgroup Master
# --------- ------
while lines:
line = lines.pop().strip()
if re.match(r'-+\s+', line):
continue
if not line:
break
words = line.split()
(workgroup, hostname) = (words[0].lower(), words[1].lower())
debug3('< group(%s) -> %s\n' % (workgroup, hostname))
check_host(hostname)
check_workgroup(workgroup)
if lines:
assert(0)
def _check_nmb(hostname, is_workgroup, is_master):
return
global _nmb_ok
if not _nmb_ok:
return
argv = ['nmblookup'] + ['-M'] * is_master + ['--', hostname]
debug2(' > n%d%d: %s\n' % (is_workgroup, is_master, hostname))
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
lines = p.stdout.readlines()
rv = p.wait()
except OSError, e:
log('%r failed: %r\n' % (argv, e))
_nmb_ok = False
return
if rv:
log('%r returned %d\n' % (argv, rv))
return
for line in lines:
m = re.match(r'(\d+\.\d+\.\d+\.\d+) (\w+)<\w\w>\n', line)
if m:
g = m.groups()
(ip, name) = (g[0], g[1].lower())
debug3('< %s -> %s\n' % (name, ip))
if is_workgroup:
_enqueue(_check_smb, ip)
else:
found_host(name, ip)
check_host(name)
def check_host(hostname):
if _is_ip(hostname):
_enqueue(_check_revdns, hostname)
else:
_enqueue(_check_dns, hostname)
_enqueue(_check_smb, hostname)
_enqueue(_check_nmb, hostname, False, False)
def check_workgroup(hostname):
_enqueue(_check_nmb, hostname, True, False)
_enqueue(_check_nmb, hostname, True, True)
def _enqueue(op, *args):
t = (op, args)
if queue.get(t) is None:
queue[t] = 0
def _stdin_still_ok(timeout):
r, w, x = select.select([sys.stdin.fileno()], [], [], timeout)
if r:
b = os.read(sys.stdin.fileno(), 4096)
if not b:
return False
return True
def hw_main(seed_hosts):
if helpers.verbose >= 2:
helpers.logprefix = 'HH: '
else:
helpers.logprefix = 'hostwatch: '
read_host_cache()
_enqueue(_check_etc_hosts)
_enqueue(_check_netstat)
check_host('localhost')
check_host(socket.gethostname())
check_workgroup('workgroup')
check_workgroup('-')
for h in seed_hosts:
check_host(h)
while 1:
now = time.time()
for t, last_polled in queue.items():
(op, args) = t
if not _stdin_still_ok(0):
break
maxtime = POLL_TIME
if op == _check_netstat:
maxtime = NETSTAT_POLL_TIME
if now - last_polled > maxtime:
queue[t] = time.time()
op(*args)
try:
sys.stdout.flush()
except IOError:
break
# FIXME: use a smarter timeout based on oldest last_polled
if not _stdin_still_ok(1):
break

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import sys
import re
import socket
import helpers
import options
import client
import server
import firewall
import hostwatch
from helpers import log, Fatal
# 1.2.3.4/5 or just 1.2.3.4
def parse_subnet4(s):
m = re.match(r'(\d+)(?:\.(\d+)\.(\d+)\.(\d+))?(?:/(\d+))?$', s)
if not m:
raise Fatal('%r is not a valid IP subnet format' % s)
(a, b, c, d, width) = m.groups()
(a, b, c, d) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0))
if width is None:
width = 32
else:
width = int(width)
if a > 255 or b > 255 or c > 255 or d > 255:
raise Fatal('%d.%d.%d.%d has numbers > 255' % (a, b, c, d))
if width > 32:
raise Fatal('*/%d is greater than the maximum of 32' % width)
return(socket.AF_INET, '%d.%d.%d.%d' % (a, b, c, d), width)
# 1:2::3/64 or just 1:2::3
def parse_subnet6(s):
m = re.match(r'(?:([a-fA-F\d:]+))?(?:/(\d+))?$', s)
if not m:
raise Fatal('%r is not a valid IP subnet format' % s)
(net, width) = m.groups()
if width is None:
width = 128
else:
width = int(width)
if width > 128:
raise Fatal('*/%d is greater than the maximum of 128' % width)
return(socket.AF_INET6, net, width)
# Subnet file, supporting empty lines and hash-started comment lines
def parse_subnet_file(s):
try:
handle = open(s, 'r')
except OSError:
raise Fatal('Unable to open subnet file: %s' % s)
raw_config_lines = handle.readlines()
config_lines = []
for line_no, line in enumerate(raw_config_lines):
line = line.strip()
if len(line) == 0:
continue
if line[0] == '#':
continue
config_lines.append(line)
return config_lines
# list of:
# 1.2.3.4/5 or just 1.2.3.4
# 1:2::3/64 or just 1:2::3
def parse_subnets(subnets_str):
subnets = []
for s in subnets_str:
if ':' in s:
subnet = parse_subnet6(s)
else:
subnet = parse_subnet4(s)
subnets.append(subnet)
return subnets
# 1.2.3.4:567 or just 1.2.3.4 or just 567
def parse_ipport4(s):
s = str(s)
m = re.match(r'(?:(\d+)\.(\d+)\.(\d+)\.(\d+))?(?::)?(?:(\d+))?$', s)
if not m:
raise Fatal('%r is not a valid IP:port format' % s)
(a, b, c, d, port) = m.groups()
(a, b, c, d, port) = (int(a or 0), int(b or 0), int(c or 0), int(d or 0),
int(port or 0))
if a > 255 or b > 255 or c > 255 or d > 255:
raise Fatal('%d.%d.%d.%d has numbers > 255' % (a, b, c, d))
if port > 65535:
raise Fatal('*:%d is greater than the maximum of 65535' % port)
if a is None:
a = b = c = d = 0
return ('%d.%d.%d.%d' % (a, b, c, d), port)
# [1:2::3]:456 or [1:2::3] or 456
def parse_ipport6(s):
s = str(s)
m = re.match(r'(?:\[([^]]*)])?(?::)?(?:(\d+))?$', s)
if not m:
raise Fatal('%s is not a valid IP:port format' % s)
(ip, port) = m.groups()
(ip, port) = (ip or '::', int(port or 0))
return (ip, port)
optspec = """
sshuttle [-l [ip:]port] [-r [username@]sshserver[:port]] <subnets...>
sshuttle --server
sshuttle --firewall <port> <subnets...>
sshuttle --hostwatch
--
l,listen= transproxy to this ip address and port number
H,auto-hosts scan for remote hostnames and update local /etc/hosts
N,auto-nets automatically determine subnets to route
dns capture local DNS requests and forward to the remote DNS server
method= auto, nat, tproxy, pf or ipfw
python= path to python interpreter on the remote server
r,remote= ssh hostname (and optional username) of remote sshuttle server
x,exclude= exclude this subnet (can be used more than once)
X,exclude-from= exclude the subnets in a file (whitespace separated)
v,verbose increase debug message verbosity
e,ssh-cmd= the command to use to connect to the remote [ssh]
seed-hosts= with -H, use these hostnames for initial scan (comma-separated)
no-latency-control sacrifice latency to improve bandwidth benchmarks
wrap= restart counting channel numbers after this number (for testing)
D,daemon run in the background as a daemon
s,subnets= file where the subnets are stored, instead of on the command line
syslog send log messages to syslog (default if you use --daemon)
pidfile= pidfile name (only if using --daemon) [./sshuttle.pid]
server (internal use only)
firewall (internal use only)
hostwatch (internal use only)
"""
o = options.Options(optspec)
(opt, flags, extra) = o.parse(sys.argv[2:])
if opt.daemon:
opt.syslog = 1
if opt.wrap:
import ssnet
ssnet.MAX_CHANNEL = int(opt.wrap)
helpers.verbose = opt.verbose
try:
if opt.server:
if len(extra) != 0:
o.fatal('no arguments expected')
server.latency_control = opt.latency_control
sys.exit(server.main())
elif opt.firewall:
if len(extra) != 6:
o.fatal('exactly six arguments expected')
sys.exit(firewall.main(int(extra[0]), int(extra[1]),
int(extra[2]), int(extra[3]),
extra[4], int(extra[5]), opt.syslog))
elif opt.hostwatch:
sys.exit(hostwatch.hw_main(extra))
else:
if len(extra) < 1 and not opt.auto_nets and not opt.subnets:
o.fatal('at least one subnet, subnet file, or -N expected')
includes = extra
excludes = ['127.0.0.0/8']
for k, v in flags:
if k in ('-x', '--exclude'):
excludes.append(v)
if k in ('-X', '--exclude-from'):
excludes += open(v).read().split()
remotename = opt.remote
if remotename == '' or remotename == '-':
remotename = None
if opt.seed_hosts and not opt.auto_hosts:
o.fatal('--seed-hosts only works if you also use -H')
if opt.seed_hosts:
sh = re.split(r'[\s,]+', (opt.seed_hosts or "").strip())
elif opt.auto_hosts:
sh = []
else:
sh = None
if opt.subnets:
includes = parse_subnet_file(opt.subnets)
if not opt.method:
method = "auto"
elif opt.method in ["auto", "nat", "tproxy", "ipfw", "pf"]:
method = opt.method
else:
o.fatal("method %s not supported" % opt.method)
if not opt.listen:
if opt.method == "tproxy":
ipport_v6 = parse_ipport6('[::1]:0')
else:
ipport_v6 = None
ipport_v4 = parse_ipport4('127.0.0.1:0')
else:
ipport_v6 = None
ipport_v4 = None
list = opt.listen.split(",")
for ip in list:
if '[' in ip and ']' in ip and opt.method == "tproxy":
ipport_v6 = parse_ipport6(ip)
else:
ipport_v4 = parse_ipport4(ip)
return_code = client.main(ipport_v6, ipport_v4,
opt.ssh_cmd,
remotename,
opt.python,
opt.latency_control,
opt.dns,
method,
sh,
opt.auto_nets,
parse_subnets(includes),
parse_subnets(excludes),
opt.syslog, opt.daemon, opt.pidfile)
if return_code == 0:
log('Normal exit code, exiting...')
else:
log('Abnormal exit code detected, failing...' % return_code)
sys.exit(return_code)
except Fatal, e:
log('fatal: %s\n' % e)
sys.exit(99)
except KeyboardInterrupt:
log('\n')
log('Keyboard interrupt: exiting.\n')
sys.exit(1)

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"""Command-line options parser.
With the help of an options spec string, easily parse command-line options.
"""
import sys
import os
import textwrap
import getopt
import re
import struct
class OptDict:
def __init__(self):
self._opts = {}
def __setitem__(self, k, v):
if k.startswith('no-') or k.startswith('no_'):
k = k[3:]
v = not v
self._opts[k] = v
def __getitem__(self, k):
if k.startswith('no-') or k.startswith('no_'):
return not self._opts[k[3:]]
return self._opts[k]
def __getattr__(self, k):
return self[k]
def _default_onabort(msg):
sys.exit(97)
def _intify(v):
try:
vv = int(v or '')
if str(vv) == v:
return vv
except ValueError:
pass
return v
def _atoi(v):
try:
return int(v or 0)
except ValueError:
return 0
def _remove_negative_kv(k, v):
if k.startswith('no-') or k.startswith('no_'):
return k[3:], not v
return k, v
def _remove_negative_k(k):
return _remove_negative_kv(k, None)[0]
def _tty_width():
if not hasattr(sys.stderr, "fileno"):
return _atoi(os.environ.get('WIDTH')) or 70
s = struct.pack("HHHH", 0, 0, 0, 0)
try:
import fcntl
import termios
s = fcntl.ioctl(sys.stderr.fileno(), termios.TIOCGWINSZ, s)
except (IOError, ImportError):
return _atoi(os.environ.get('WIDTH')) or 70
(ysize, xsize, ypix, xpix) = struct.unpack('HHHH', s)
return xsize or 70
class Options:
"""Option parser.
When constructed, two strings are mandatory. The first one is the command
name showed before error messages. The second one is a string called an
optspec that specifies the synopsis and option flags and their description.
For more information about optspecs, consult the bup-options(1) man page.
Two optional arguments specify an alternative parsing function and an
alternative behaviour on abort (after having output the usage string).
By default, the parser function is getopt.gnu_getopt, and the abort
behaviour is to exit the program.
"""
def __init__(self, optspec, optfunc=getopt.gnu_getopt,
onabort=_default_onabort):
self.optspec = optspec
self._onabort = onabort
self.optfunc = optfunc
self._aliases = {}
self._shortopts = 'h?'
self._longopts = ['help']
self._hasparms = {}
self._defaults = {}
self._usagestr = self._gen_usage()
def _gen_usage(self):
out = []
lines = self.optspec.strip().split('\n')
lines.reverse()
first_syn = True
while lines:
l = lines.pop()
if l == '--':
break
out.append('%s: %s\n' % (first_syn and 'usage' or ' or', l))
first_syn = False
out.append('\n')
last_was_option = False
while lines:
l = lines.pop()
if l.startswith(' '):
out.append('%s%s\n' % (last_was_option and '\n' or '',
l.lstrip()))
last_was_option = False
elif l:
(flags, extra) = l.split(' ', 1)
extra = extra.strip()
if flags.endswith('='):
flags = flags[:-1]
has_parm = 1
else:
has_parm = 0
g = re.search(r'\[([^\]]*)\]$', extra)
if g:
defval = g.group(1)
else:
defval = None
flagl = flags.split(',')
flagl_nice = []
for _f in flagl:
f, dvi = _remove_negative_kv(_f, _intify(defval))
self._aliases[f] = _remove_negative_k(flagl[0])
self._hasparms[f] = has_parm
self._defaults[f] = dvi
if len(f) == 1:
self._shortopts += f + (has_parm and ':' or '')
flagl_nice.append('-' + f)
else:
f_nice = re.sub(r'\W', '_', f)
self._aliases[f_nice] = _remove_negative_k(flagl[0])
self._longopts.append(f + (has_parm and '=' or ''))
self._longopts.append('no-' + f)
flagl_nice.append('--' + _f)
flags_nice = ', '.join(flagl_nice)
if has_parm:
flags_nice += ' ...'
prefix = ' %-20s ' % flags_nice
argtext = '\n'.join(textwrap.wrap(extra, width=_tty_width(),
initial_indent=prefix,
subsequent_indent=' ' * 28))
out.append(argtext + '\n')
last_was_option = True
else:
out.append('\n')
last_was_option = False
return ''.join(out).rstrip() + '\n'
def usage(self, msg=""):
"""Print usage string to stderr and abort."""
sys.stderr.write(self._usagestr)
e = self._onabort and self._onabort(msg) or None
if e:
raise e
def fatal(self, s):
"""Print an error message to stderr and abort with usage string."""
msg = 'error: %s\n' % s
sys.stderr.write(msg)
return self.usage(msg)
def parse(self, args):
"""Parse a list of arguments and return (options, flags, extra).
In the returned tuple, "options" is an OptDict with known options,
"flags" is a list of option flags that were used on the command-line,
and "extra" is a list of positional arguments.
"""
try:
(flags, extra) = self.optfunc(
args, self._shortopts, self._longopts)
except getopt.GetoptError, e:
self.fatal(e)
opt = OptDict()
for k, v in self._defaults.iteritems():
k = self._aliases[k]
opt[k] = v
for (k, v) in flags:
k = k.lstrip('-')
if k in ('h', '?', 'help'):
self.usage()
if k.startswith('no-'):
k = self._aliases[k[3:]]
v = 0
else:
k = self._aliases[k]
if not self._hasparms[k]:
assert(v == '')
v = (opt._opts.get(k) or 0) + 1
else:
v = _intify(v)
opt[k] = v
for (f1, f2) in self._aliases.iteritems():
opt[f1] = opt._opts.get(f2)
return (opt, flags, extra)

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import re
import struct
import socket
import traceback
import time
import sys
import os
if not globals().get('skip_imports'):
import ssnet
import helpers
import hostwatch
import compat.ssubprocess as ssubprocess
from ssnet import Handler, Proxy, Mux, MuxWrapper
from helpers import log, debug1, debug2, debug3, Fatal, \
resolvconf_random_nameserver
if not globals().get('latency_control'):
latency_control = None
def _ipmatch(ipstr):
if ipstr == 'default':
ipstr = '0.0.0.0/0'
m = re.match(r'^(\d+(\.\d+(\.\d+(\.\d+)?)?)?)(?:/(\d+))?$', ipstr)
if m:
g = m.groups()
ips = g[0]
width = int(g[4] or 32)
if g[1] is None:
ips += '.0.0.0'
width = min(width, 8)
elif g[2] is None:
ips += '.0.0'
width = min(width, 16)
elif g[3] is None:
ips += '.0'
width = min(width, 24)
return (struct.unpack('!I', socket.inet_aton(ips))[0], width)
def _ipstr(ip, width):
if width >= 32:
return ip
else:
return "%s/%d" % (ip, width)
def _maskbits(netmask):
if not netmask:
return 32
for i in range(32):
if netmask[0] & _shl(1, i):
return 32 - i
return 0
def _shl(n, bits):
return n * int(2 ** bits)
def _list_routes():
argv = ['netstat', '-rn']
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE)
routes = []
for line in p.stdout:
cols = re.split(r'\s+', line)
ipw = _ipmatch(cols[0])
if not ipw:
continue # some lines won't be parseable; never mind
maskw = _ipmatch(cols[2]) # linux only
mask = _maskbits(maskw) # returns 32 if maskw is null
width = min(ipw[1], mask)
ip = ipw[0] & _shl(_shl(1, width) - 1, 32 - width)
routes.append(
(socket.AF_INET, socket.inet_ntoa(struct.pack('!I', ip)), width))
rv = p.wait()
if rv != 0:
log('WARNING: %r returned %d\n' % (argv, rv))
log('WARNING: That prevents --auto-nets from working.\n')
return routes
def list_routes():
for (family, ip, width) in _list_routes():
if not ip.startswith('0.') and not ip.startswith('127.'):
yield (family, ip, width)
def _exc_dump():
exc_info = sys.exc_info()
return ''.join(traceback.format_exception(*exc_info))
def start_hostwatch(seed_hosts):
s1, s2 = socket.socketpair()
pid = os.fork()
if not pid:
# child
rv = 99
try:
try:
s2.close()
os.dup2(s1.fileno(), 1)
os.dup2(s1.fileno(), 0)
s1.close()
rv = hostwatch.hw_main(seed_hosts) or 0
except Exception:
log('%s\n' % _exc_dump())
rv = 98
finally:
os._exit(rv)
s1.close()
return pid, s2
class Hostwatch:
def __init__(self):
self.pid = 0
self.sock = None
class DnsProxy(Handler):
def __init__(self, mux, chan, request):
# FIXME! IPv4 specific
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
Handler.__init__(self, [sock])
self.timeout = time.time() + 30
self.mux = mux
self.chan = chan
self.tries = 0
self.peer = None
self.request = request
self.sock = sock
# FIXME! IPv4 specific
self.sock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
self.try_send()
def try_send(self):
if self.tries >= 3:
return
self.tries += 1
# FIXME! Support IPv6 nameservers
self.peer = resolvconf_random_nameserver()[1]
self.sock.connect((self.peer, 53))
debug2('DNS: sending to %r\n' % self.peer)
try:
self.sock.send(self.request)
except socket.error, e:
if e.args[0] in ssnet.NET_ERRS:
# might have been spurious; try again.
# Note: these errors sometimes are reported by recv(),
# and sometimes by send(). We have to catch both.
debug2('DNS send to %r: %s\n' % (self.peer, e))
self.try_send()
return
else:
log('DNS send to %r: %s\n' % (self.peer, e))
return
def callback(self):
try:
data = self.sock.recv(4096)
except socket.error, e:
if e.args[0] in ssnet.NET_ERRS:
# might have been spurious; try again.
# Note: these errors sometimes are reported by recv(),
# and sometimes by send(). We have to catch both.
debug2('DNS recv from %r: %s\n' % (self.peer, e))
self.try_send()
return
else:
log('DNS recv from %r: %s\n' % (self.peer, e))
return
debug2('DNS response: %d bytes\n' % len(data))
self.mux.send(self.chan, ssnet.CMD_DNS_RESPONSE, data)
self.ok = False
class UdpProxy(Handler):
def __init__(self, mux, chan, family):
sock = socket.socket(family, socket.SOCK_DGRAM)
Handler.__init__(self, [sock])
self.timeout = time.time() + 30
self.mux = mux
self.chan = chan
self.sock = sock
if family == socket.AF_INET:
self.sock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
def send(self, dstip, data):
debug2('UDP: sending to %r port %d\n' % dstip)
try:
self.sock.sendto(data, dstip)
except socket.error, e:
log('UDP send to %r port %d: %s\n' % (dstip[0], dstip[1], e))
return
def callback(self):
try:
data, peer = self.sock.recvfrom(4096)
except socket.error, e:
log('UDP recv from %r port %d: %s\n' % (peer[0], peer[1], e))
return
debug2('UDP response: %d bytes\n' % len(data))
hdr = "%s,%r," % (peer[0], peer[1])
self.mux.send(self.chan, ssnet.CMD_UDP_DATA, hdr + data)
def main():
if helpers.verbose >= 1:
helpers.logprefix = ' s: '
else:
helpers.logprefix = 'server: '
debug1('latency control setting = %r\n' % latency_control)
routes = list(list_routes())
debug1('available routes:\n')
for r in routes:
debug1(' %d/%s/%d\n' % r)
# synchronization header
sys.stdout.write('\0\0SSHUTTLE0001')
sys.stdout.flush()
handlers = []
mux = Mux(socket.fromfd(sys.stdin.fileno(),
socket.AF_INET, socket.SOCK_STREAM),
socket.fromfd(sys.stdout.fileno(),
socket.AF_INET, socket.SOCK_STREAM))
handlers.append(mux)
routepkt = ''
for r in routes:
routepkt += '%d,%s,%d\n' % r
mux.send(0, ssnet.CMD_ROUTES, routepkt)
hw = Hostwatch()
hw.leftover = ''
def hostwatch_ready():
assert(hw.pid)
content = hw.sock.recv(4096)
if content:
lines = (hw.leftover + content).split('\n')
if lines[-1]:
# no terminating newline: entry isn't complete yet!
hw.leftover = lines.pop()
lines.append('')
else:
hw.leftover = ''
mux.send(0, ssnet.CMD_HOST_LIST, '\n'.join(lines))
else:
raise Fatal('hostwatch process died')
def got_host_req(data):
if not hw.pid:
(hw.pid, hw.sock) = start_hostwatch(data.strip().split())
handlers.append(Handler(socks=[hw.sock],
callback=hostwatch_ready))
mux.got_host_req = got_host_req
def new_channel(channel, data):
(family, dstip, dstport) = data.split(',', 2)
family = int(family)
dstport = int(dstport)
outwrap = ssnet.connect_dst(family, dstip, dstport)
handlers.append(Proxy(MuxWrapper(mux, channel), outwrap))
mux.new_channel = new_channel
dnshandlers = {}
def dns_req(channel, data):
debug2('Incoming DNS request channel=%d.\n' % channel)
h = DnsProxy(mux, channel, data)
handlers.append(h)
dnshandlers[channel] = h
mux.got_dns_req = dns_req
udphandlers = {}
def udp_req(channel, cmd, data):
debug2('Incoming UDP request channel=%d, cmd=%d\n' % (channel, cmd))
if cmd == ssnet.CMD_UDP_DATA:
(dstip, dstport, data) = data.split(",", 2)
dstport = int(dstport)
debug2('is incoming UDP data. %r %d.\n' % (dstip, dstport))
h = udphandlers[channel]
h.send((dstip, dstport), data)
elif cmd == ssnet.CMD_UDP_CLOSE:
debug2('is incoming UDP close\n')
h = udphandlers[channel]
h.ok = False
del mux.channels[channel]
def udp_open(channel, data):
debug2('Incoming UDP open.\n')
family = int(data)
mux.channels[channel] = lambda cmd, data: udp_req(channel, cmd, data)
if channel in udphandlers:
raise Fatal('UDP connection channel %d already open' % channel)
else:
h = UdpProxy(mux, channel, family)
handlers.append(h)
udphandlers[channel] = h
mux.got_udp_open = udp_open
while mux.ok:
if hw.pid:
assert(hw.pid > 0)
(rpid, rv) = os.waitpid(hw.pid, os.WNOHANG)
if rpid:
raise Fatal(
'hostwatch exited unexpectedly: code 0x%04x\n' % rv)
ssnet.runonce(handlers, mux)
if latency_control:
mux.check_fullness()
mux.callback()
if dnshandlers:
now = time.time()
for channel, h in dnshandlers.items():
if h.timeout < now or not h.ok:
debug3('expiring dnsreqs channel=%d\n' % channel)
del dnshandlers[channel]
h.ok = False
if udphandlers:
for channel, h in udphandlers.items():
if not h.ok:
debug3('expiring UDP channel=%d\n' % channel)
del udphandlers[channel]
h.ok = False

104
src/ssh.py Normal file
View File

@ -0,0 +1,104 @@
import sys
import os
import re
import socket
import zlib
import compat.ssubprocess as ssubprocess
import helpers
from helpers import debug2
def readfile(name):
basedir = os.path.dirname(os.path.abspath(sys.argv[0]))
path = [basedir] + sys.path
for d in path:
fullname = os.path.join(d, name)
if os.path.exists(fullname):
return open(fullname, 'rb').read()
raise Exception("can't find file %r in any of %r" % (name, path))
def empackage(z, filename, data=None):
(path, basename) = os.path.split(filename)
if not data:
data = readfile(filename)
content = z.compress(data)
content += z.flush(zlib.Z_SYNC_FLUSH)
return '%s\n%d\n%s' % (basename, len(content), content)
def connect(ssh_cmd, rhostport, python, stderr, options):
portl = []
if (rhostport or '').count(':') > 1:
if rhostport.count(']') or rhostport.count('['):
result = rhostport.split(']')
rhost = result[0].strip('[')
if len(result) > 1:
result[1] = result[1].strip(':')
if result[1] is not '':
portl = ['-p', str(int(result[1]))]
# can't disambiguate IPv6 colons and a port number. pass the hostname
# through.
else:
rhost = rhostport
else: # IPv4
l = (rhostport or '').split(':', 1)
rhost = l[0]
if len(l) > 1:
portl = ['-p', str(int(l[1]))]
if rhost == '-':
rhost = None
z = zlib.compressobj(1)
content = readfile('assembler.py')
optdata = ''.join("%s=%r\n" % (k, v) for (k, v) in options.items())
content2 = (empackage(z, 'cmdline_options.py', optdata) +
empackage(z, 'helpers.py') +
empackage(z, 'compat/ssubprocess.py') +
empackage(z, 'ssnet.py') +
empackage(z, 'hostwatch.py') +
empackage(z, 'server.py') +
"\n")
pyscript = r"""
import sys;
skip_imports=1;
verbosity=%d;
exec compile(sys.stdin.read(%d), "assembler.py", "exec")
""" % (helpers.verbose or 0, len(content))
pyscript = re.sub(r'\s+', ' ', pyscript.strip())
if not rhost:
# ignore the --python argument when running locally; we already know
# which python version works.
argv = [sys.argv[1], '-c', pyscript]
else:
if ssh_cmd:
sshl = ssh_cmd.split(' ')
else:
sshl = ['ssh']
if python:
pycmd = "'%s' -c '%s'" % (python, pyscript)
else:
pycmd = ("P=python2; $P -V 2>/dev/null || P=python; "
"exec \"$P\" -c '%s'") % pyscript
argv = (sshl +
portl +
[rhost, '--', pycmd])
(s1, s2) = socket.socketpair()
def setup():
# runs in the child process
s2.close()
s1a, s1b = os.dup(s1.fileno()), os.dup(s1.fileno())
s1.close()
debug2('executing: %r\n' % argv)
p = ssubprocess.Popen(argv, stdin=s1a, stdout=s1b, preexec_fn=setup,
close_fds=True, stderr=stderr)
os.close(s1a)
os.close(s1b)
s2.sendall(content)
s2.sendall(content2)
return p, s2

12
src/sshuttle Executable file
View File

@ -0,0 +1,12 @@
#!/bin/sh
EXE=$0
for i in 1 2 3 4 5 6 7 8 9 10; do
[ -L "$EXE" ] || break
EXE=$(readlink "$EXE")
done
DIR=$(dirname "$EXE")
if python2 -V 2>/dev/null; then
exec python2 "$DIR/main.py" python2 "$@"
else
exec python "$DIR/main.py" python "$@"
fi

284
src/sshuttle.md Normal file
View File

@ -0,0 +1,284 @@
% sshuttle(8) Sshuttle 0.46
% Avery Pennarun <apenwarr@gmail.com>
% 2011-01-25
# NAME
sshuttle - a transparent proxy-based VPN using ssh
# SYNOPSIS
sshuttle [options...] [-r [username@]sshserver[:port]] \<subnets...\>
# DESCRIPTION
sshuttle allows you to create a VPN connection from your
machine to any remote server that you can connect to via
ssh, as long as that server has python 2.3 or higher.
To work, you must have root access on the local machine,
but you can have a normal account on the server.
It's valid to run sshuttle more than once simultaneously on
a single client machine, connecting to a different server
every time, so you can be on more than one VPN at once.
If run on a router, sshuttle can forward traffic for your
entire subnet to the VPN.
# OPTIONS
\<subnets...\>
: a list of subnets to route over the VPN, in the form
`a.b.c.d[/width]`. Valid examples are 1.2.3.4 (a
single IP address), 1.2.3.4/32 (equivalent to 1.2.3.4),
1.2.3.0/24 (a 24-bit subnet, ie. with a 255.255.255.0
netmask), and 0/0 ('just route everything through the
VPN').
-l, --listen=*[ip:]port*
: use this ip address and port number as the transparent
proxy port. By default sshuttle finds an available
port automatically and listens on IP 127.0.0.1
(localhost), so you don't need to override it, and
connections are only proxied from the local machine,
not from outside machines. If you want to accept
connections from other machines on your network (ie. to
run sshuttle on a router) try enabling IP Forwarding in
your kernel, then using `--listen 0.0.0.0:0`.
-H, --auto-hosts
: scan for remote hostnames and update the local /etc/hosts
file with matching entries for as long as the VPN is
open. This is nicer than changing your system's DNS
(/etc/resolv.conf) settings, for several reasons. First,
hostnames are added without domain names attached, so
you can `ssh thatserver` without worrying if your local
domain matches the remote one. Second, if you sshuttle
into more than one VPN at a time, it's impossible to
use more than one DNS server at once anyway, but
sshuttle correctly merges /etc/hosts entries between
all running copies. Third, if you're only routing a
few subnets over the VPN, you probably would prefer to
keep using your local DNS server for everything else.
-N, --auto-nets
: in addition to the subnets provided on the command
line, ask the server which subnets it thinks we should
route, and route those automatically. The suggestions
are taken automatically from the server's routing
table.
--dns
: capture local DNS requests and forward to the remote DNS
server.
--python
: specify the name/path of the remote python interpreter.
The default is just `python`, which means to use the
default python interpreter on the remote system's PATH.
-r, --remote=*[username@]sshserver[:port]*
: the remote hostname and optional username and ssh
port number to use for connecting to the remote server.
For example, example.com, testuser@example.com,
testuser@example.com:2222, or example.com:2244.
-x, --exclude=*subnet*
: explicitly exclude this subnet from forwarding. The
format of this option is the same as the `<subnets>`
option. To exclude more than one subnet, specify the
`-x` option more than once. You can say something like
`0/0 -x 1.2.3.0/24` to forward everything except the
local subnet over the VPN, for example.
-X, --exclude-from=*file*
: exclude the subnets specified in a file, one subnet per
line. Useful when you have lots of subnets to exclude.
-v, --verbose
: print more information about the session. This option
can be used more than once for increased verbosity. By
default, sshuttle prints only error messages.
-e, --ssh-cmd
: the command to use to connect to the remote server. The
default is just `ssh`. Use this if your ssh client is
in a non-standard location or you want to provide extra
options to the ssh command, for example, `-e 'ssh -v'`.
--seed-hosts
: a comma-separated list of hostnames to use to
initialize the `--auto-hosts` scan algorithm.
`--auto-hosts` does things like poll local SMB servers
for lists of local hostnames, but can speed things up
if you use this option to give it a few names to start
from.
--no-latency-control
: sacrifice latency to improve bandwidth benchmarks. ssh
uses really big socket buffers, which can overload the
connection if you start doing large file transfers,
thus making all your other sessions inside the same
tunnel go slowly. Normally, sshuttle tries to avoid
this problem using a "fullness check" that allows only
a certain amount of outstanding data to be buffered at
a time. But on high-bandwidth links, this can leave a
lot of your bandwidth underutilized. It also makes
sshuttle seem slow in bandwidth benchmarks (benchmarks
rarely test ping latency, which is what sshuttle is
trying to control). This option disables the latency
control feature, maximizing bandwidth usage. Use at
your own risk.
-D, --daemon
: automatically fork into the background after connecting
to the remote server. Implies `--syslog`.
--syslog
: after connecting, send all log messages to the
`syslog`(3) service instead of stderr. This is
implicit if you use `--daemon`.
--pidfile=*pidfilename*
: when using `--daemon`, save sshuttle's pid to
*pidfilename*. The default is `sshuttle.pid` in the
current directory.
--server
: (internal use only) run the sshuttle server on
stdin/stdout. This is what the client runs on
the remote end.
--firewall
: (internal use only) run the firewall manager. This is
the only part of sshuttle that must run as root. If
you start sshuttle as a non-root user, it will
automatically run `sudo` or `su` to start the firewall
manager, but the core of sshuttle still runs as a
normal user.
--hostwatch
: (internal use only) run the hostwatch daemon. This
process runs on the server side and collects hostnames for
the `--auto-hosts` option. Using this option by itself
makes it a lot easier to debug and test the `--auto-hosts`
feature.
# EXAMPLES
Test locally by proxying all local connections, without using ssh:
$ sshuttle -v 0/0
Starting sshuttle proxy.
Listening on ('0.0.0.0', 12300).
[local sudo] Password:
firewall manager ready.
c : connecting to server...
s: available routes:
s: 192.168.42.0/24
c : connected.
firewall manager: starting transproxy.
c : Accept: 192.168.42.106:50035 -> 192.168.42.121:139.
c : Accept: 192.168.42.121:47523 -> 77.141.99.22:443.
...etc...
^C
firewall manager: undoing changes.
KeyboardInterrupt
c : Keyboard interrupt: exiting.
c : SW#8:192.168.42.121:47523: deleting
c : SW#6:192.168.42.106:50035: deleting
Test connection to a remote server, with automatic hostname
and subnet guessing:
$ sshuttle -vNHr example.org
Starting sshuttle proxy.
Listening on ('0.0.0.0', 12300).
firewall manager ready.
c : connecting to server...
s: available routes:
s: 77.141.99.0/24
c : connected.
c : seed_hosts: []
firewall manager: starting transproxy.
hostwatch: Found: testbox1: 1.2.3.4
hostwatch: Found: mytest2: 5.6.7.8
hostwatch: Found: domaincontroller: 99.1.2.3
c : Accept: 192.168.42.121:60554 -> 77.141.99.22:22.
^C
firewall manager: undoing changes.
c : Keyboard interrupt: exiting.
c : SW#6:192.168.42.121:60554: deleting
# DISCUSSION
When it starts, sshuttle creates an ssh session to the
server specified by the `-r` option. If `-r` is omitted,
it will start both its client and server locally, which is
sometimes useful for testing.
After connecting to the remote server, sshuttle uploads its
(python) source code to the remote end and executes it
there. Thus, you don't need to install sshuttle on the
remote server, and there are never sshuttle version
conflicts between client and server.
Unlike most VPNs, sshuttle forwards sessions, not packets.
That is, it uses kernel transparent proxying (`iptables
REDIRECT` rules on Linux, or `ipfw fwd` rules on BSD) to
capture outgoing TCP sessions, then creates entirely
separate TCP sessions out to the original destination at
the other end of the tunnel.
Packet-level forwarding (eg. using the tun/tap devices on
Linux) seems elegant at first, but it results in
several problems, notably the 'tcp over tcp' problem. The
tcp protocol depends fundamentally on packets being dropped
in order to implement its congestion control agorithm; if
you pass tcp packets through a tcp-based tunnel (such as
ssh), the inner tcp packets will never be dropped, and so
the inner tcp stream's congestion control will be
completely broken, and performance will be terrible. Thus,
packet-based VPNs (such as IPsec and openvpn) cannot use
tcp-based encrypted streams like ssh or ssl, and have to
implement their own encryption from scratch, which is very
complex and error prone.
sshuttle's simplicity comes from the fact that it can
safely use the existing ssh encrypted tunnel without
incurring a performance penalty. It does this by letting
the client-side kernel manage the incoming tcp stream, and
the server-side kernel manage the outgoing tcp stream;
there is no need for congestion control to be shared
between the two separate streams, so a tcp-based tunnel is
fine.
# BUGS
On MacOS 10.6 (at least up to 10.6.6), your network will
stop responding about 10 minutes after the first time you
start sshuttle, because of a MacOS kernel bug relating to
arp and the net.inet.ip.scopedroute sysctl. To fix it,
just switch your wireless off and on. Sshuttle makes the
kernel setting it changes permanent, so this won't happen
again, even after a reboot.
On MacOS, sshuttle will set the kernel boot flag
net.inet.ip.scopedroute to 0, which interferes with OS X
Internet Sharing and some VPN clients. To reset this flag,
you can remove any reference to net.inet.ip.scopedroute from
/Library/Preferences/SystemConfiguration/com.apple.Boot.plist
and reboot.
# SEE ALSO
`ssh`(1), `python`(1)

256
sshuttle/ssnet.py → src/ssnet.py
View File

@ -1,21 +1,22 @@
import sys
import struct
import socket
import errno
import select
import os
from sshuttle.helpers import b, log, debug1, debug2, debug3, Fatal, set_non_blocking_io
if not globals().get('skip_imports'):
from helpers import log, debug1, debug2, debug3, Fatal
MAX_CHANNEL = 65535
LATENCY_BUFFER_SIZE = 32768
# these don't exist in the socket module in python 2.3!
SHUT_RD = 0
SHUT_WR = 1
SHUT_RDWR = 2
HDR_LEN = 8
CMD_EXIT = 0x4200
CMD_PING = 0x4201
CMD_PONG = 0x4202
@ -53,19 +54,17 @@ cmd_to_name = {
NET_ERRS = [errno.ECONNREFUSED, errno.ETIMEDOUT,
errno.EHOSTUNREACH, errno.ENETUNREACH,
errno.EHOSTDOWN, errno.ENETDOWN,
errno.ENETUNREACH, errno.ECONNABORTED,
errno.ECONNRESET]
errno.EHOSTDOWN, errno.ENETDOWN]
def _add(socks, elem):
if elem not in socks:
socks.append(elem)
def _add(l, elem):
if not elem in l:
l.append(elem)
def _fds(socks):
def _fds(l):
out = []
for i in socks:
for i in l:
try:
out.append(i.fileno())
except AttributeError:
@ -77,13 +76,11 @@ def _fds(socks):
def _nb_clean(func, *args):
try:
return func(*args)
except (OSError, socket.error):
# Note: In python2 socket.error != OSError (In python3, they are same)
_, e = sys.exc_info()[:2]
except OSError, e:
if e.errno not in (errno.EWOULDBLOCK, errno.EAGAIN):
raise
else:
debug3('%s: err was: %s' % (func.__name__, e))
debug3('%s: err was: %s\n' % (func.__name__, e))
return None
@ -92,14 +89,9 @@ def _try_peername(sock):
pn = sock.getpeername()
if pn:
return '%s:%s' % (pn[0], pn[1])
except socket.error:
_, e = sys.exc_info()[:2]
if e.args[0] == errno.EINVAL:
pass
elif e.args[0] not in (errno.ENOTCONN, errno.ENOTSOCK):
except socket.error, e:
if e.args[0] not in (errno.ENOTCONN, errno.ENOTSOCK):
raise
except AttributeError:
pass
return 'unknown'
@ -111,7 +103,7 @@ class SockWrapper:
def __init__(self, rsock, wsock, connect_to=None, peername=None):
global _swcount
_swcount += 1
debug3('creating new SockWrapper (%d now exist)' % _swcount)
debug3('creating new SockWrapper (%d now exist)\n' % _swcount)
self.exc = None
self.rsock = rsock
self.wsock = wsock
@ -124,9 +116,9 @@ class SockWrapper:
def __del__(self):
global _swcount
_swcount -= 1
debug1('%r: deleting (%d remain)' % (self, _swcount))
debug1('%r: deleting (%d remain)\n' % (self, _swcount))
if self.exc:
debug1('%r: error was: %s' % (self, self.exc))
debug1('%r: error was: %s\n' % (self, self.exc))
def __repr__(self):
if self.rsock == self.wsock:
@ -148,14 +140,13 @@ class SockWrapper:
if not self.connect_to:
return # already connected
self.rsock.setblocking(False)
debug3('%r: trying connect to %r' % (self, self.connect_to))
debug3('%r: trying connect to %r\n' % (self, self.connect_to))
try:
self.rsock.connect(self.connect_to)
# connected successfully (Linux)
self.connect_to = None
except socket.error:
_, e = sys.exc_info()[:2]
debug3('%r: connect result: %s' % (self, e))
except socket.error, e:
debug3('%r: connect result: %s\n' % (self, e))
if e.args[0] == errno.EINVAL:
# this is what happens when you call connect() on a socket
# that is now connected but returned EINPROGRESS last time,
@ -165,28 +156,22 @@ class SockWrapper:
realerr = self.rsock.getsockopt(socket.SOL_SOCKET,
socket.SO_ERROR)
e = socket.error(realerr, os.strerror(realerr))
debug3('%r: fixed connect result: %s' % (self, e))
debug3('%r: fixed connect result: %s\n' % (self, e))
if e.args[0] in [errno.EINPROGRESS, errno.EALREADY]:
pass # not connected yet
elif sys.platform == 'win32' and e.args[0] == errno.WSAEWOULDBLOCK: # 10035
pass # not connected yet
elif e.args[0] == 0:
if sys.platform == 'win32':
# On Windows "real" error of EINVAL could be 0, when socket is in connecting state
pass
else:
# connected successfully (weird Linux bug?)
# Sometimes Linux seems to return EINVAL when it isn't
# invalid. This *may* be caused by a race condition
# between connect() and getsockopt(SO_ERROR) (ie. it
# finishes connecting in between the two, so there is no
# longer an error). However, I'm not sure of that.
#
# I did get at least one report that the problem went away
# when we added this, however.
self.connect_to = None
# connected successfully (weird Linux bug?)
# Sometimes Linux seems to return EINVAL when it isn't
# invalid. This *may* be caused by a race condition
# between connect() and getsockopt(SO_ERROR) (ie. it
# finishes connecting in between the two, so there is no
# longer an error). However, I'm not sure of that.
#
# I did get at least one report that the problem went away
# when we added this, however.
self.connect_to = None
elif e.args[0] == errno.EISCONN:
# connected successfully (BSD + Windows)
# connected successfully (BSD)
self.connect_to = None
elif e.args[0] in NET_ERRS + [errno.EACCES, errno.EPERM]:
# a "normal" kind of error
@ -197,21 +182,20 @@ class SockWrapper:
def noread(self):
if not self.shut_read:
debug2('%r: done reading' % self)
debug2('%r: done reading\n' % self)
self.shut_read = True
# self.rsock.shutdown(SHUT_RD) # doesn't do anything anyway
def nowrite(self):
if not self.shut_write:
debug2('%r: done writing' % self)
debug2('%r: done writing\n' % self)
self.shut_write = True
try:
self.wsock.shutdown(SHUT_WR)
except socket.error:
_, e = sys.exc_info()[:2]
except socket.error, e:
self.seterr('nowrite: %s' % e)
@staticmethod
def too_full():
def too_full(self):
return False # fullness is determined by the socket's select() state
def uwrite(self, buf):
@ -219,11 +203,10 @@ class SockWrapper:
return 0 # still connecting
self.wsock.setblocking(False)
try:
return _nb_clean(self.wsock.send, buf)
except OSError:
_, e = sys.exc_info()[:2]
return _nb_clean(os.write, self.wsock.fileno(), buf)
except OSError, e:
if e.errno == errno.EPIPE:
debug1('%r: uwrite: got EPIPE' % self)
debug1('%r: uwrite: got EPIPE\n' % self)
self.nowrite()
return 0
else:
@ -232,7 +215,7 @@ class SockWrapper:
return 0
def write(self, buf):
assert buf
assert(buf)
return self.uwrite(buf)
def uread(self):
@ -242,11 +225,10 @@ class SockWrapper:
return
self.rsock.setblocking(False)
try:
return _nb_clean(self.rsock.recv, 65536)
except OSError:
_, e = sys.exc_info()[:2]
return _nb_clean(os.read, self.rsock.fileno(), 65536)
except OSError, e:
self.seterr('uread: %s' % e)
return b('') # unexpected error... we'll call it EOF
return '' # unexpected error... we'll call it EOF
def fill(self):
if self.buf:
@ -254,7 +236,7 @@ class SockWrapper:
rb = self.uread()
if rb:
self.buf.append(rb)
if rb == b(''): # empty string means EOF; None means temporarily empty
if rb == '': # empty string means EOF; None means temporarily empty
self.noread()
def copy_to(self, outwrap):
@ -279,13 +261,13 @@ class Handler:
for i in self.socks:
_add(r, i)
def callback(self, sock):
log('--no callback defined-- %r' % self)
(r, _, _) = select.select(self.socks, [], [], 0)
def callback(self):
log('--no callback defined-- %r\n' % self)
(r, w, x) = select.select(self.socks, [], [], 0)
for s in r:
v = s.recv(4096)
if not v:
log('--closed-- %r' % self)
log('--closed-- %r\n' % self)
self.socks = []
self.ok = False
@ -320,7 +302,7 @@ class Proxy(Handler):
elif not self.wrap2.shut_read:
_add(r, self.wrap2.rsock)
def callback(self, sock):
def callback(self):
self.wrap1.try_connect()
self.wrap2.try_connect()
self.wrap1.fill()
@ -342,25 +324,25 @@ class Proxy(Handler):
class Mux(Handler):
def __init__(self, rfile, wfile):
Handler.__init__(self, [rfile, wfile])
self.rfile = rfile
self.wfile = wfile
def __init__(self, rsock, wsock):
Handler.__init__(self, [rsock, wsock])
self.rsock = rsock
self.wsock = wsock
self.new_channel = self.got_dns_req = self.got_routes = None
self.got_udp_open = self.got_udp_data = self.got_udp_close = None
self.got_host_req = self.got_host_list = None
self.channels = {}
self.chani = 0
self.want = 0
self.inbuf = b('')
self.inbuf = ''
self.outbuf = []
self.fullness = 0
self.too_full = False
self.send(0, CMD_PING, b('chicken'))
self.send(0, CMD_PING, 'chicken')
def next_channel(self):
# channel 0 is special, so we never allocate it
for _ in range(1024):
for timeout in xrange(1024):
self.chani += 1
if self.chani > MAX_CHANNEL:
self.chani = 1
@ -369,50 +351,52 @@ class Mux(Handler):
def amount_queued(self):
total = 0
for byte in self.outbuf:
total += len(byte)
for b in self.outbuf:
total += len(b)
return total
def check_fullness(self):
if self.fullness > LATENCY_BUFFER_SIZE:
if self.fullness > 32768:
if not self.too_full:
self.send(0, CMD_PING, b('rttest'))
self.send(0, CMD_PING, 'rttest')
self.too_full = True
#ob = []
# for b in self.outbuf:
# (s1,s2,c) = struct.unpack('!ccH', b[:4])
# ob.append(c)
#log('outbuf: %d %r\n' % (self.amount_queued(), ob))
def send(self, channel, cmd, data):
assert isinstance(data, bytes)
assert len(data) <= 65535
p = struct.pack('!ccHHH', b('S'), b('S'), channel, cmd, len(data)) \
+ data
data = str(data)
assert(len(data) <= 65535)
p = struct.pack('!ccHHH', 'S', 'S', channel, cmd, len(data)) + data
self.outbuf.append(p)
debug2(' > channel=%d cmd=%s len=%d (fullness=%d)'
debug2(' > channel=%d cmd=%s len=%d (fullness=%d)\n'
% (channel, cmd_to_name.get(cmd, hex(cmd)),
len(data), self.fullness))
# debug3('>>> data: %r' % data)
self.fullness += len(data)
def got_packet(self, channel, cmd, data):
debug2('< channel=%d cmd=%s len=%d'
debug2('< channel=%d cmd=%s len=%d\n'
% (channel, cmd_to_name.get(cmd, hex(cmd)), len(data)))
# debug3('<<< data: %r' % data)
if cmd == CMD_PING:
self.send(0, CMD_PONG, data)
elif cmd == CMD_PONG:
debug2('received PING response')
debug2('received PING response\n')
self.too_full = False
self.fullness = 0
elif cmd == CMD_EXIT:
self.ok = False
elif cmd == CMD_TCP_CONNECT:
assert not self.channels.get(channel)
assert(not self.channels.get(channel))
if self.new_channel:
self.new_channel(channel, data)
elif cmd == CMD_DNS_REQ:
assert not self.channels.get(channel)
assert(not self.channels.get(channel))
if self.got_dns_req:
self.got_dns_req(channel, data)
elif cmd == CMD_UDP_OPEN:
assert not self.channels.get(channel)
assert(not self.channels.get(channel))
if self.got_udp_open:
self.got_udp_open(channel, data)
elif cmd == CMD_ROUTES:
@ -433,46 +417,43 @@ class Mux(Handler):
else:
callback = self.channels.get(channel)
if not callback:
log('warning: closed channel %d got cmd=%s len=%d'
log('warning: closed channel %d got cmd=%s len=%d\n'
% (channel, cmd_to_name.get(cmd, hex(cmd)), len(data)))
else:
callback(cmd, data)
def flush(self):
set_non_blocking_io(self.wfile.fileno())
self.wsock.setblocking(False)
if self.outbuf and self.outbuf[0]:
wrote = _nb_clean(self.wfile.write, self.outbuf[0])
# self.wfile.flush()
debug2('mux wrote: %r/%d' % (wrote, len(self.outbuf[0])))
wrote = _nb_clean(os.write, self.wsock.fileno(), self.outbuf[0])
debug2('mux wrote: %r/%d\n' % (wrote, len(self.outbuf[0])))
if wrote:
self.outbuf[0] = self.outbuf[0][wrote:]
while self.outbuf and not self.outbuf[0]:
self.outbuf[0:1] = []
def fill(self):
set_non_blocking_io(self.rfile.fileno())
self.rsock.setblocking(False)
try:
# If LATENCY_BUFFER_SIZE is inappropriately large, we will
# get a MemoryError here. Read no more than 1MiB.
read = _nb_clean(self.rfile.read, min(1048576, LATENCY_BUFFER_SIZE))
debug2('mux read: %r' % len(read))
except OSError:
_, e = sys.exc_info()[:2]
b = _nb_clean(os.read, self.rsock.fileno(), 32768)
except OSError, e:
raise Fatal('other end: %r' % e)
# log('<<< %r' % b)
if read == b(''): # EOF
#log('<<< %r\n' % b)
if b == '': # EOF
self.ok = False
if read:
self.inbuf += read
if b:
self.inbuf += b
def handle(self):
self.fill()
# log('inbuf is: (%d,%d) %r\n'
# % (self.want, len(self.inbuf), self.inbuf))
while 1:
if len(self.inbuf) >= (self.want or HDR_LEN):
(s1, s2, channel, cmd, datalen) = \
struct.unpack('!ccHHH', self.inbuf[:HDR_LEN])
assert s1 == b('S')
assert s2 == b('S')
assert(s1 == 'S')
assert(s2 == 'S')
self.want = datalen + HDR_LEN
if self.want and len(self.inbuf) >= self.want:
data = self.inbuf[HDR_LEN:self.want]
@ -483,27 +464,27 @@ class Mux(Handler):
break
def pre_select(self, r, w, x):
_add(r, self.rfile)
_add(r, self.rsock)
if self.outbuf:
_add(w, self.wfile)
_add(w, self.wsock)
def callback(self, sock):
(r, w, _) = select.select([self.rfile], [self.wfile], [], 0)
if self.rfile in r:
def callback(self):
(r, w, x) = select.select([self.rsock], [self.wsock], [], 0)
if self.rsock in r:
self.handle()
if self.outbuf and self.wfile in w:
if self.outbuf and self.wsock in w:
self.flush()
class MuxWrapper(SockWrapper):
def __init__(self, mux, channel):
SockWrapper.__init__(self, mux.rfile, mux.wfile)
SockWrapper.__init__(self, mux.rsock, mux.wsock)
self.mux = mux
self.channel = channel
self.mux.channels[channel] = self.got_packet
self.socks = []
debug2('new channel: %d' % channel)
debug2('new channel: %d\n' % channel)
def __del__(self):
self.nowrite()
@ -514,29 +495,18 @@ class MuxWrapper(SockWrapper):
def noread(self):
if not self.shut_read:
self.mux.send(self.channel, CMD_TCP_STOP_SENDING, b(''))
self.setnoread()
def setnoread(self):
if not self.shut_read:
debug2('%r: done reading' % self)
self.shut_read = True
self.mux.send(self.channel, CMD_TCP_STOP_SENDING, '')
self.maybe_close()
def nowrite(self):
if not self.shut_write:
self.mux.send(self.channel, CMD_TCP_EOF, b(''))
self.setnowrite()
def setnowrite(self):
if not self.shut_write:
debug2('%r: done writing' % self)
self.shut_write = True
self.mux.send(self.channel, CMD_TCP_EOF, '')
self.maybe_close()
def maybe_close(self):
if self.shut_read and self.shut_write:
debug2('%r: closing connection' % self)
# remove the mux's reference to us. The python garbage collector
# will then be able to reap our object.
self.mux.channels[self.channel] = None
@ -554,17 +524,15 @@ class MuxWrapper(SockWrapper):
def uread(self):
if self.shut_read:
return b('') # EOF
return '' # EOF
else:
return None # no data available right now
def got_packet(self, cmd, data):
if cmd == CMD_TCP_EOF:
# Remote side already knows the status - set flag but don't notify
self.setnoread()
self.noread()
elif cmd == CMD_TCP_STOP_SENDING:
# Remote side already knows the status - set flag but don't notify
self.setnowrite()
self.nowrite()
elif cmd == CMD_TCP_DATA:
self.buf.append(data)
else:
@ -573,37 +541,37 @@ class MuxWrapper(SockWrapper):
def connect_dst(family, ip, port):
debug2('Connecting to %s:%d' % (ip, port))
debug2('Connecting to %s:%d\n' % (ip, port))
outsock = socket.socket(family)
outsock.setsockopt(socket.SOL_IP, socket.IP_TTL, 42)
return SockWrapper(outsock, outsock,
connect_to=(ip, port),
peername='%s:%d' % (ip, port))
peername = '%s:%d' % (ip, port))
def runonce(handlers, mux):
r = []
w = []
x = []
to_remove = [s for s in handlers if not s.ok]
to_remove = filter(lambda s: not s.ok, handlers)
for h in to_remove:
handlers.remove(h)
for s in handlers:
s.pre_select(r, w, x)
debug2('Waiting: %d r=%r w=%r x=%r (fullness=%d/%d)'
debug2('Waiting: %d r=%r w=%r x=%r (fullness=%d/%d)\n'
% (len(handlers), _fds(r), _fds(w), _fds(x),
mux.fullness, mux.too_full))
(r, w, x) = select.select(r, w, x)
debug2(' Ready: %d r=%r w=%r x=%r'
debug2(' Ready: %d r=%r w=%r x=%r\n'
% (len(handlers), _fds(r), _fds(w), _fds(x)))
ready = r + w + x
did = {}
for h in handlers:
for s in h.socks:
if s in ready:
h.callback(s)
h.callback()
did[s] = 1
for s in ready:
if s not in did:
if not s in did:
raise Fatal('socket %r was not used by any handler' % s)

19
src/ssyslog.py Normal file
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@ -0,0 +1,19 @@
import sys
import os
from compat import ssubprocess
_p = None
def start_syslog():
global _p
_p = ssubprocess.Popen(['logger',
'-p', 'daemon.notice',
'-t', 'sshuttle'], stdin=ssubprocess.PIPE)
def stderr_to_syslog():
sys.stdout.flush()
sys.stderr.flush()
os.dup2(_p.stdin.fileno(), 2)

89
src/stresstest.py Executable file
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@ -0,0 +1,89 @@
#!/usr/bin/env python
import socket
import select
import struct
import time
listener = socket.socket()
listener.bind(('127.0.0.1', 0))
listener.listen(500)
servers = []
clients = []
remain = {}
NUMCLIENTS = 50
count = 0
while 1:
if len(clients) < NUMCLIENTS:
c = socket.socket()
c.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
c.bind(('0.0.0.0', 0))
c.connect(listener.getsockname())
count += 1
if count >= 16384:
count = 1
print 'cli CREATING %d' % count
b = struct.pack('I', count) + 'x' * count
remain[c] = count
print 'cli >> %r' % len(b)
c.send(b)
c.shutdown(socket.SHUT_WR)
clients.append(c)
r = [listener]
time.sleep(0.1)
else:
r = [listener] + servers + clients
print 'select(%d)' % len(r)
r, w, x = select.select(r, [], [], 5)
assert(r)
for i in r:
if i == listener:
s, addr = listener.accept()
servers.append(s)
elif i in servers:
b = i.recv(4096)
print 'srv << %r' % len(b)
if not i in remain:
assert(len(b) >= 4)
want = struct.unpack('I', b[:4])[0]
b = b[4:]
# i.send('y'*want)
else:
want = remain[i]
if want < len(b):
print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
assert(want >= len(b))
want -= len(b)
remain[i] = want
if not b: # EOF
if want:
print 'weird: eof but wanted %d more' % want
assert(want == 0)
i.close()
servers.remove(i)
del remain[i]
else:
print 'srv >> %r' % len(b)
i.send('y' * len(b))
if not want:
i.shutdown(socket.SHUT_WR)
elif i in clients:
b = i.recv(4096)
print 'cli << %r' % len(b)
want = remain[i]
if want < len(b):
print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
assert(want >= len(b))
want -= len(b)
remain[i] = want
if not b: # EOF
if want:
print 'weird: eof but wanted %d more' % want
assert(want == 0)
i.close()
clients.remove(i)
del remain[i]
listener.accept()

8
src/ui-macos/.gitignore vendored Normal file
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@ -0,0 +1,8 @@
*.pyc
*~
/*.nib
/debug.app
/sources.list
/Sshuttle VPN.app
/*.tar.gz
/*.zip

BIN
src/ui-macos/ChickenErrorTemplate.pdf Normal file
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BIN
src/ui-macos/ChickenIdleTemplate.pdf Normal file
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BIN
src/ui-macos/ChickenRunningTemplate.pdf Normal file
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40
src/ui-macos/Info.plist Normal file
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@ -0,0 +1,40 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleDisplayName</key>
<string>Sshuttle VPN</string>
<key>CFBundleExecutable</key>
<string>Sshuttle</string>
<key>CFBundleIconFile</key>
<string>app.icns</string>
<key>CFBundleIdentifier</key>
<string>ca.apenwarr.Sshuttle</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>Sshuttle VPN</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>0.0.0</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>0.0.0</string>
<key>LSUIElement</key>
<string>1</string>
<key>LSHasLocalizedDisplayName</key>
<false/>
<key>NSAppleScriptEnabled</key>
<false/>
<key>NSHumanReadableCopyright</key>
<string>GNU LGPL Version 2</string>
<key>NSMainNibFile</key>
<string>MainMenu</string>
<key>NSPrincipalClass</key>
<string>NSApplication</string>
</dict>
</plist>

2609
src/ui-macos/MainMenu.xib Normal file
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File diff suppressed because it is too large Load Diff

10
src/ui-macos/UserDefaults.plist Normal file
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@ -0,0 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>startAtLogin</key>
<false/>
<key>autoReconnect</key>
<true/>
</dict>
</plist>

1
src/ui-macos/all.do Normal file
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@ -0,0 +1 @@
redo-ifchange debug.app dist

BIN
src/ui-macos/app.icns Normal file
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30
src/ui-macos/askpass.py Normal file
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@ -0,0 +1,30 @@
import re
import subprocess
def askpass(prompt):
prompt = prompt.replace('"', "'")
if 'yes/no' in prompt:
return "yes"
script = """
tell application "Finder"
activate
display dialog "%s" \
with title "Sshuttle SSH Connection" \
default answer "" \
with icon caution \
with hidden answer
end tell
""" % prompt
p = subprocess.Popen(['osascript', '-e', script], stdout=subprocess.PIPE)
out = p.stdout.read()
rv = p.wait()
if rv:
return None
g = re.match("text returned:(.*), button returned:.*", out)
if not g:
return None
return g.group(1)

1
src/ui-macos/bits/.gitignore vendored Normal file
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@ -0,0 +1 @@
/runpython

1
src/ui-macos/bits/PkgInfo Normal file
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@ -0,0 +1 @@
APPL????

23
src/ui-macos/bits/runpython.c Normal file
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@ -0,0 +1,23 @@
/*
* This rather pointless program acts like the python interpreter, except
* it's intended to sit inside a MacOS .app package, so that its argv[0]
* will point inside the package.
*
* NSApplicationMain() looks for Info.plist using the path in argv[0], which
* goes wrong if your interpreter is /usr/bin/python.
*/
#include <Python/Python.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char **argv)
{
char *path = strdup(argv[0]), *cptr;
char *args[] = {argv[0], "../Resources/main.py", NULL};
cptr = strrchr(path, '/');
if (cptr)
*cptr = 0;
chdir(path);
free(path);
return Py_Main(2, args);
}

20
src/ui-macos/bits/runpython.do Normal file
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@ -0,0 +1,20 @@
exec >&2
redo-ifchange runpython.c
ARCHES=""
printf "Platforms: "
if [ -d /usr/libexec/gcc/darwin ]; then
for d in /usr/libexec/gcc/darwin/*; do
PLAT=$(basename "$d")
[ "$PLAT" != "ppc64" ] || continue # fails for some reason on my Mac
ARCHES="$ARCHES -arch $PLAT"
printf "$PLAT "
done
fi
printf "\n"
PYTHON_LDFLAGS=$(python-config --ldflags)
PYTHON_INCLUDES=$(python-config --includes)
gcc $ARCHES \
-Wall -o $3 runpython.c \
$PYTHON_INCLUDES \
$PYTHON_LDFLAGS \
-framework Python

4
src/ui-macos/clean.do Normal file
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@ -0,0 +1,4 @@
exec >&2
find . -name '*~' | xargs rm -f
rm -rf *.app *.zip *.tar.gz
rm -f bits/runpython *.nib sources.list

15
src/ui-macos/debug.app.do Normal file
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@ -0,0 +1,15 @@
redo-ifchange bits/runpython MainMenu.nib
rm -rf debug.app
mkdir debug.app debug.app/Contents
cd debug.app/Contents
ln -s ../.. Resources
ln -s ../.. English.lproj
ln -s ../../Info.plist .
ln -s ../../app.icns .
mkdir MacOS
cd MacOS
ln -s ../../../bits/runpython Sshuttle
cd ../../..
redo-ifchange $(find debug.app -type f)

28
src/ui-macos/default.app.do Normal file
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@ -0,0 +1,28 @@
TOP=$PWD
redo-ifchange sources.list
redo-ifchange Info.plist bits/runpython \
$(while read name newname; do echo "$name"; done <sources.list)
rm -rf "$2.app"
mkdir "$2.app" "$2.app/Contents"
cd "$2.app/Contents"
cp "$TOP/Info.plist" .
mkdir MacOS
cp "$TOP/bits/runpython" MacOS/Sshuttle
mkdir Resources
cd "$TOP"
while read name newname; do
[ -z "$name" ] && continue
: "${newname:=$name}"
outname=$2.app/Contents/Resources/$newname
outdir=$(dirname "$outname")
[ -d "$outdir" ] || mkdir "$outdir"
cp "${name-$newname}" "$outname"
done <sources.list
cd "$2.app"
redo-ifchange $(find . -type f)

5
src/ui-macos/default.app.tar.gz.do Normal file
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@ -0,0 +1,5 @@
exec >&2
IFS="
"
redo-ifchange $2.app
tar -czf $3 $2.app/

5
src/ui-macos/default.app.zip.do Normal file
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@ -0,0 +1,5 @@
exec >&2
IFS="
"
redo-ifchange $2.app
zip -q -r $3 $2.app/

2
src/ui-macos/default.nib.do Normal file
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@ -0,0 +1,2 @@
redo-ifchange $2.xib
ibtool --compile $3 $2.xib

1
src/ui-macos/dist.do Normal file
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@ -0,0 +1 @@
redo-ifchange "Sshuttle VPN.app.zip" "Sshuttle VPN.app.tar.gz"

19
src/ui-macos/git-export.do Normal file
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@ -0,0 +1,19 @@
# update a local branch with pregenerated output files, so people can download
# the completed tarballs from github. Since we don't have any real binaries,
# our final distribution package contains mostly blobs from the source code,
# so this doesn't cost us much extra space in the repo.
BRANCH=dist/macos
redo-ifchange 'Sshuttle VPN.app'
git update-ref refs/heads/$BRANCH origin/$BRANCH '' 2>/dev/null || true
export GIT_INDEX_FILE=$PWD/gitindex.tmp
rm -f "$GIT_INDEX_FILE"
git add -f 'Sshuttle VPN.app'
MSG="MacOS precompiled app package for $(git describe)"
TREE=$(git write-tree --prefix=ui-macos)
git show-ref refs/heads/$BRANCH >/dev/null && PARENT="-p refs/heads/$BRANCH"
COMMITID=$(echo "$MSG" | git commit-tree $TREE $PARENT)
git update-ref refs/heads/$BRANCH $COMMITID
rm -f "$GIT_INDEX_FILE"

401
src/ui-macos/main.py Normal file
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@ -0,0 +1,401 @@
import sys
import os
import pty
from AppKit import (
objc,
NSApp,
NSApplicationMain,
NSAttributedString,
NSFileHandle,
NSFileHandleDataAvailableNotification,
NSImage,
NSMenu,
NSMenuItem,
NSNotificationCenter,
NSObject,
NSStatusBar,
NSVariableStatusItemLength,
)
import my
import models
import askpass
def sshuttle_args(host, auto_nets, auto_hosts, dns, nets, debug,
no_latency_control):
argv = [my.bundle_path('sshuttle/sshuttle', ''), '-r', host]
assert(argv[0])
if debug:
argv.append('-v')
if auto_nets:
argv.append('--auto-nets')
if auto_hosts:
argv.append('--auto-hosts')
if dns:
argv.append('--dns')
if no_latency_control:
argv.append('--no-latency-control')
argv += nets
return argv
class _Callback(NSObject):
def initWithFunc_(self, func):
self = super(_Callback, self).init()
self.func = func
return self
def func_(self, obj):
return self.func(obj)
class Callback:
def __init__(self, func):
self.obj = _Callback.alloc().initWithFunc_(func)
self.sel = self.obj.func_
class Runner:
def __init__(self, argv, logfunc, promptfunc, serverobj):
print 'in __init__'
self.id = argv
self.rv = None
self.pid = None
self.fd = None
self.logfunc = logfunc
self.promptfunc = promptfunc
self.serverobj = serverobj
self.buf = ''
self.logfunc('\nConnecting to %s.\n' % self.serverobj.host())
print 'will run: %r' % argv
self.serverobj.setConnected_(False)
pid, fd = pty.fork()
if pid == 0:
# child
try:
os.execvp(argv[0], argv)
except Exception, e:
sys.stderr.write('failed to start: %r\n' % e)
raise
finally:
os._exit(42)
# parent
self.pid = pid
self.file = NSFileHandle.alloc()\
.initWithFileDescriptor_closeOnDealloc_(fd, True)
self.cb = Callback(self.gotdata)
NSNotificationCenter.defaultCenter()\
.addObserver_selector_name_object_(
self.cb.obj, self.cb.sel,
NSFileHandleDataAvailableNotification, self.file)
self.file.waitForDataInBackgroundAndNotify()
def __del__(self):
self.wait()
def _try_wait(self, options):
if self.rv is None and self.pid > 0:
pid, code = os.waitpid(self.pid, options)
if pid == self.pid:
if os.WIFEXITED(code):
self.rv = os.WEXITSTATUS(code)
else:
self.rv = -os.WSTOPSIG(code)
self.serverobj.setConnected_(False)
self.serverobj.setError_('VPN process died')
self.logfunc('Disconnected.\n')
print 'wait_result: %r' % self.rv
return self.rv
def wait(self):
rv = None
while rv is None:
self.gotdata(None)
rv = self._try_wait(os.WNOHANG)
def poll(self):
return self._try_wait(os.WNOHANG)
def kill(self):
assert(self.pid > 0)
print 'killing: pid=%r rv=%r' % (self.pid, self.rv)
if self.rv is None:
self.logfunc('Disconnecting from %s.\n' % self.serverobj.host())
os.kill(self.pid, 15)
self.wait()
def gotdata(self, notification):
print 'gotdata!'
d = str(self.file.availableData())
if d:
self.logfunc(d)
self.buf = self.buf + d
if 'Connected.\r\n' in self.buf:
self.serverobj.setConnected_(True)
self.buf = self.buf[-4096:]
if self.buf.strip().endswith(':'):
lastline = self.buf.rstrip().split('\n')[-1]
resp = self.promptfunc(lastline)
add = ' (response)\n'
self.buf += add
self.logfunc(add)
self.file.writeData_(my.Data(resp + '\n'))
self.file.waitForDataInBackgroundAndNotify()
self.poll()
# print 'gotdata done!'
class SshuttleApp(NSObject):
def initialize(self):
d = my.PList('UserDefaults')
my.Defaults().registerDefaults_(d)
class SshuttleController(NSObject):
# Interface builder outlets
startAtLoginField = objc.IBOutlet()
autoReconnectField = objc.IBOutlet()
debugField = objc.IBOutlet()
routingField = objc.IBOutlet()
prefsWindow = objc.IBOutlet()
serversController = objc.IBOutlet()
logField = objc.IBOutlet()
latencyControlField = objc.IBOutlet()
servers = []
conns = {}
def _connect(self, server):
host = server.host()
print 'connecting %r' % host
self.fill_menu()
def logfunc(msg):
print 'log! (%d bytes)' % len(msg)
self.logField.textStorage()\
.appendAttributedString_(NSAttributedString.alloc()
.initWithString_(msg))
self.logField.didChangeText()
def promptfunc(prompt):
print 'prompt! %r' % prompt
return askpass.askpass(prompt)
nets_mode = server.autoNets()
if nets_mode == models.NET_MANUAL:
manual_nets = ["%s/%d" % (i.subnet(), i.width())
for i in server.nets()]
elif nets_mode == models.NET_ALL:
manual_nets = ['0/0']
else:
manual_nets = []
noLatencyControl = (server.latencyControl() != models.LAT_INTERACTIVE)
conn = Runner(sshuttle_args(host,
auto_nets=nets_mode == models.NET_AUTO,
auto_hosts=server.autoHosts(),
dns=server.useDns(),
nets=manual_nets,
debug=self.debugField.state(),
no_latency_control=noLatencyControl),
logfunc=logfunc, promptfunc=promptfunc,
serverobj=server)
self.conns[host] = conn
def _disconnect(self, server):
host = server.host()
print 'disconnecting %r' % host
conn = self.conns.get(host)
if conn:
conn.kill()
self.fill_menu()
self.logField.textStorage().setAttributedString_(
NSAttributedString.alloc().initWithString_(''))
@objc.IBAction
def cmd_connect(self, sender):
server = sender.representedObject()
server.setWantConnect_(True)
@objc.IBAction
def cmd_disconnect(self, sender):
server = sender.representedObject()
server.setWantConnect_(False)
@objc.IBAction
def cmd_show(self, sender):
self.prefsWindow.makeKeyAndOrderFront_(self)
NSApp.activateIgnoringOtherApps_(True)
@objc.IBAction
def cmd_quit(self, sender):
NSStatusBar.systemStatusBar().removeStatusItem_(self.statusitem)
NSApp.performSelector_withObject_afterDelay_(NSApp.terminate_,
None, 0.0)
def fill_menu(self):
menu = self.menu
menu.removeAllItems()
def additem(name, func, obj):
it = menu.addItemWithTitle_action_keyEquivalent_(name, None, "")
it.setRepresentedObject_(obj)
it.setTarget_(self)
it.setAction_(func)
def addnote(name):
additem(name, None, None)
any_inprogress = None
any_conn = None
any_err = None
if len(self.servers):
for i in self.servers:
host = i.host()
title = i.title()
want = i.wantConnect()
connected = i.connected()
numnets = len(list(i.nets()))
if not host:
additem('Connect Untitled', None, i)
elif i.autoNets() == models.NET_MANUAL and not numnets:
additem('Connect %s (no routes)' % host, None, i)
elif want:
any_conn = i
additem('Disconnect %s' % title, self.cmd_disconnect, i)
else:
additem('Connect %s' % title, self.cmd_connect, i)
if not want:
msg = 'Off'
elif i.error():
msg = 'ERROR - try reconnecting'
any_err = i
elif connected:
msg = 'Connected'
else:
msg = 'Connecting...'
any_inprogress = i
addnote(' State: %s' % msg)
else:
addnote('No servers defined yet')
menu.addItem_(NSMenuItem.separatorItem())
additem('Preferences...', self.cmd_show, None)
additem('Quit Sshuttle VPN', self.cmd_quit, None)
if any_err:
self.statusitem.setImage_(self.img_err)
self.statusitem.setTitle_('Error!')
elif any_conn:
self.statusitem.setImage_(self.img_running)
if any_inprogress:
self.statusitem.setTitle_('Connecting...')
else:
self.statusitem.setTitle_('')
else:
self.statusitem.setImage_(self.img_idle)
self.statusitem.setTitle_('')
def load_servers(self):
l = my.Defaults().arrayForKey_('servers') or []
sl = []
for s in l:
host = s.get('host', None)
if not host:
continue
nets = s.get('nets', [])
nl = []
for n in nets:
subnet = n[0]
width = n[1]
net = models.SshuttleNet.alloc().init()
net.setSubnet_(subnet)
net.setWidth_(width)
nl.append(net)
autoNets = s.get('autoNets', models.NET_AUTO)
autoHosts = s.get('autoHosts', True)
useDns = s.get('useDns', autoNets == models.NET_ALL)
latencyControl = s.get('latencyControl', models.LAT_INTERACTIVE)
srv = models.SshuttleServer.alloc().init()
srv.setHost_(host)
srv.setAutoNets_(autoNets)
srv.setAutoHosts_(autoHosts)
srv.setNets_(nl)
srv.setUseDns_(useDns)
srv.setLatencyControl_(latencyControl)
sl.append(srv)
self.serversController.addObjects_(sl)
self.serversController.setSelectionIndex_(0)
def save_servers(self):
l = []
for s in self.servers:
host = s.host()
if not host:
continue
nets = []
for n in s.nets():
subnet = n.subnet()
if not subnet:
continue
nets.append((subnet, n.width()))
d = dict(host=s.host(),
nets=nets,
autoNets=s.autoNets(),
autoHosts=s.autoHosts(),
useDns=s.useDns(),
latencyControl=s.latencyControl())
l.append(d)
my.Defaults().setObject_forKey_(l, 'servers')
self.fill_menu()
def awakeFromNib(self):
self.routingField.removeAllItems()
tf = self.routingField.addItemWithTitle_
tf('Send all traffic through this server')
tf('Determine automatically')
tf('Custom...')
self.latencyControlField.removeAllItems()
tf = self.latencyControlField.addItemWithTitle_
tf('Fast transfer')
tf('Low latency')
# Hmm, even when I mark this as !enabled in the .nib, it still comes
# through as enabled. So let's just disable it here (since we don't
# support this feature yet).
self.startAtLoginField.setEnabled_(False)
self.startAtLoginField.setState_(False)
self.autoReconnectField.setEnabled_(False)
self.autoReconnectField.setState_(False)
self.load_servers()
# Initialize our menu item
self.menu = NSMenu.alloc().initWithTitle_('Sshuttle')
bar = NSStatusBar.systemStatusBar()
statusitem = bar.statusItemWithLength_(NSVariableStatusItemLength)
self.statusitem = statusitem
self.img_idle = NSImage.imageNamed_('ChickenIdleTemplate')
self.img_running = NSImage.imageNamed_('ChickenRunningTemplate')
self.img_err = NSImage.imageNamed_('ChickenErrorTemplate')
statusitem.setImage_(self.img_idle)
statusitem.setMenu_(self.menu)
self.fill_menu()
models.configchange_callback = my.DelayedCallback(self.save_servers)
def sc(server):
if server.wantConnect():
self._connect(server)
else:
self._disconnect(server)
models.setconnect_callback = sc
# Note: NSApplicationMain calls sys.exit(), so this never returns.
NSApplicationMain(sys.argv)

189
src/ui-macos/models.py Normal file
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from AppKit import (objc, NSObject)
import my
configchange_callback = setconnect_callback = None
objc_validator = objc.signature('@@:N^@o^@')
def config_changed():
if configchange_callback:
configchange_callback()
def _validate_ip(v):
parts = v.split('.')[:4]
if len(parts) < 4:
parts += ['0'] * (4 - len(parts))
for i in range(4):
n = my.atoi(parts[i])
if n < 0:
n = 0
elif n > 255:
n = 255
parts[i] = str(n)
return '.'.join(parts)
def _validate_width(v):
n = my.atoi(v)
if n < 0:
n = 0
elif n > 32:
n = 32
return n
class SshuttleNet(NSObject):
def subnet(self):
return getattr(self, '_k_subnet', None)
def setSubnet_(self, v):
self._k_subnet = v
config_changed()
@objc_validator
def validateSubnet_error_(self, value, error):
# print 'validateSubnet!'
return True, _validate_ip(value), error
def width(self):
return getattr(self, '_k_width', 24)
def setWidth_(self, v):
self._k_width = v
config_changed()
@objc_validator
def validateWidth_error_(self, value, error):
# print 'validateWidth!'
return True, _validate_width(value), error
NET_ALL = 0
NET_AUTO = 1
NET_MANUAL = 2
LAT_BANDWIDTH = 0
LAT_INTERACTIVE = 1
class SshuttleServer(NSObject):
def init(self):
self = super(SshuttleServer, self).init()
config_changed()
return self
def wantConnect(self):
return getattr(self, '_k_wantconnect', False)
def setWantConnect_(self, v):
self._k_wantconnect = v
self.setError_(None)
config_changed()
if setconnect_callback:
setconnect_callback(self)
def connected(self):
return getattr(self, '_k_connected', False)
def setConnected_(self, v):
print 'setConnected of %r to %r' % (self, v)
self._k_connected = v
if v:
self.setError_(None) # connected ok, so no error
config_changed()
def error(self):
return getattr(self, '_k_error', None)
def setError_(self, v):
self._k_error = v
config_changed()
def isValid(self):
if not self.host():
return False
if self.autoNets() == NET_MANUAL and not len(list(self.nets())):
return False
return True
def title(self):
host = self.host()
if not host:
return host
an = self.autoNets()
suffix = ""
if an == NET_ALL:
suffix = " (all traffic)"
elif an == NET_MANUAL:
n = self.nets()
suffix = ' (%d subnet%s)' % (len(n), len(n) != 1 and 's' or '')
return self.host() + suffix
def setTitle_(self, v):
# title is always auto-generated
config_changed()
def host(self):
return getattr(self, '_k_host', None)
def setHost_(self, v):
self._k_host = v
self.setTitle_(None)
config_changed()
@objc_validator
def validateHost_error_(self, value, error):
# print 'validatehost! %r %r %r' % (self, value, error)
while value.startswith('-'):
value = value[1:]
return True, value, error
def nets(self):
return getattr(self, '_k_nets', [])
def setNets_(self, v):
self._k_nets = v
self.setTitle_(None)
config_changed()
def netsHidden(self):
# print 'checking netsHidden'
return self.autoNets() != NET_MANUAL
def setNetsHidden_(self, v):
config_changed()
# print 'setting netsHidden to %r' % v
def autoNets(self):
return getattr(self, '_k_autoNets', NET_AUTO)
def setAutoNets_(self, v):
self._k_autoNets = v
self.setNetsHidden_(-1)
self.setUseDns_(v == NET_ALL)
self.setTitle_(None)
config_changed()
def autoHosts(self):
return getattr(self, '_k_autoHosts', True)
def setAutoHosts_(self, v):
self._k_autoHosts = v
config_changed()
def useDns(self):
return getattr(self, '_k_useDns', False)
def setUseDns_(self, v):
self._k_useDns = v
config_changed()
def latencyControl(self):
return getattr(self, '_k_latencyControl', LAT_INTERACTIVE)
def setLatencyControl_(self, v):
self._k_latencyControl = v
config_changed()

70
src/ui-macos/my.py Normal file
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@ -0,0 +1,70 @@
import os
from AppKit import (
NSBundle,
NSData,
NSDictionary,
NSImage,
NSUserDefaults,
)
import PyObjCTools.AppHelper
def bundle_path(name, typ):
if typ:
return NSBundle.mainBundle().pathForResource_ofType_(name, typ)
else:
return os.path.join(NSBundle.mainBundle().resourcePath(), name)
# Load an NSData using a python string
def Data(s):
return NSData.alloc().initWithBytes_length_(s, len(s))
# Load a property list from a file in the application bundle.
def PList(name):
path = bundle_path(name, 'plist')
return NSDictionary.dictionaryWithContentsOfFile_(path)
# Load an NSImage from a file in the application bundle.
def Image(name, ext):
bytes = open(bundle_path(name, ext)).read()
img = NSImage.alloc().initWithData_(Data(bytes))
return img
# Return the NSUserDefaults shared object.
def Defaults():
return NSUserDefaults.standardUserDefaults()
# Usage:
# f = DelayedCallback(func, args...)
# later:
# f()
#
# When you call f(), it will schedule a call to func() next time the
# ObjC event loop iterates. Multiple calls to f() in a single iteration
# will only result in one call to func().
#
def DelayedCallback(func, *args, **kwargs):
flag = [0]
def _go():
if flag[0]:
print 'running %r (flag=%r)' % (func, flag)
flag[0] = 0
func(*args, **kwargs)
def call():
flag[0] += 1
PyObjCTools.AppHelper.callAfter(_go)
return call
def atoi(s):
try:
return int(s)
except ValueError:
return 0

4
src/ui-macos/run.do Normal file
View File

@ -0,0 +1,4 @@
redo-ifchange debug.app
exec >&2
./debug.app/Contents/MacOS/Sshuttle

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