Auto sudoers file (#269)

* added sudoers options to command line arguments

* added sudoers options to command line arguments

* template for sudoers file

* Added option for GUI sudo

* added support for GUI sudo

* script for auto adding sudo file

* sudoers auto add works and validates

* small change

* Clean up for CI

* removed code that belongs in another PR

* added path for package bins

* added sudoers bin

* added sudoers-add to setup file

* fixed issue with sudoers bash script

* auto sudoers now works

* added --sudoers-no-modify option

* bin now works with ./run

* removed debug print

* Updated sudoers-add script

* Fixed error passing sudoers config to script

* more dynamic building of sudoers file

* added option to specify sudoers.d file name

* fixed indent issue

* fixed indent issue

* indent issue

* clean up

* formating

* docs

* fix for flags

* Update usage.rst

* removed shell=true

* cleared CI errors

* cleared CI errors

* removed random

* cleared linter issue

* cleared linter issue

* cleared linter issue

* updated sudoers-add script

* safer temp file

* moved bin directory

* moved bin directory

* removed print

* fixed spacing issue

* sudoers commands must only containe upper case latters

docs/installation.rst

@@ -5,8 +5,18 @@ Installation
 
       pip install sshuttle
 
+- Debain package manager::
+		sudo apt install sshuttle
+
 - Clone::
 
       git clone https://github.com/sshuttle/sshuttle.git
       cd sshuttle
       ./setup.py install
+
+
+Optionally after installation
+-----------------------------
+
+- Add to sudoers file
+		sshuttle --sudoers

docs/manpage.rst

@@ -234,6 +234,29 @@ Options
     makes it a lot easier to debug and test the :option:`--auto-hosts`
     feature.
 
+.. option:: --sudoers
+
+    sshuttle will auto generate the proper sudoers.d config file and add it.
+    Once this is completed, sshuttle will exit and tell the user if
+    it succeed or not. Do not call this options with sudo, it may generate a
+    incorrect config file.
+
+.. option:: --sudoers-no-modify
+
+    sshuttle will auto generate the proper sudoers.d config and print it to
+    stdout. The option will not modify the system at all.
+
+.. option:: --sudoers-user
+
+    Set the user name or group with %group_name for passwordless operation.
+    Default is the current user.set ALL for all users. Only works with
+    --sudoers or --sudoers-no-modify option.
+
+--option:: --sudoers-filename
+
+    Set the file name for the sudoers.d file to be added. Default is
+    "sshuttle_auto". Only works with --sudoers.
+
 .. option:: --version
 
     Print program version.

docs/usage.rst

@@ -60,3 +60,46 @@ 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 auto-generate the proper sudoers.d file using the current user 
+for Linux and OSX. Doing this will allow sshuttle to run without asking for
+the local sudo password and to give users who do not have sudo access
+ability to run sshuttle.
+
+  sshuttle --sudoers
+
+DO NOT run this command with sudo, it will ask for your sudo password when
+it is needed.
+
+A costume user or group can be set with the :
+option:`sshuttle --sudoers --sudoers-username {user_descriptor}` option. Valid
+values for this vary based on how your system is configured. Values such as 
+usernames, groups pre-pended with `%` and sudoers user aliases will work. See
+the sudoers manual for more information on valid user specif actions.
+The options must be used with `--sudoers`
+
+  sshuttle --sudoers --sudoers-user mike
+  sshuttle --sudoers --sudoers-user %sudo
+
+The name of the file to be added to sudoers.d can be configured as well. This
+is mostly not necessary but can be useful for giving more than one user
+access to sshuttle. The default is `sshuttle_auto`
+
+  sshuttle --sudoer --sudoers-filename sshuttle_auto_mike
+  sshuttle --sudoer --sudoers-filename sshuttle_auto_tommy
+
+You can also see what configuration will be added to your system without
+modifying anything. This can be helpfull is the auto feature does not work, or
+you want more control. This option also works with `--sudoers-username`.
+`--sudoers-filename` has no effect with this option.
+
+  sshuttle --sudoers-no-modify
+
+This will simply sprint the generated configuration to STDOUT. Example
+
+  08:40 PM william$ sshuttle --sudoers-no-modify
+
+  Cmnd_Alias SSHUTTLE304 = /usr/bin/env PYTHONPATH=/usr/local/lib/python2.7/dist-packages/sshuttle-0.78.5.dev30+gba5e6b5.d20180909-py2.7.egg /usr/bin/python /usr/local/bin/sshuttle --method auto --firewall
+
+  william ALL=NOPASSWD: SSHUTTLE304