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https://github.com/sshuttle/sshuttle.git
synced 2024-11-24 17:04:36 +01:00
code cleanup and small refactoring
This commit is contained in:
nom3ad
Brian May
parent
de8a19ce69
commit
72060abbef
@ -58,7 +58,7 @@ else
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host=$node
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fi
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if [[ "${args[$((${#args[@]} - 1))]}" != *.* && "${args[$((${#args[@]} - 1))]}" != *:* ]]; then
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if [[ "${#args[@]}" -ne 0 && "${args[$((${#args[@]} - 1))]}" != *.* && "${args[$((${#args[@]} - 1))]}" != *:* ]]; then
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echo "No subnet specified. Using -N" >&2
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args+=('-N')
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fi
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@ -211,8 +211,8 @@ class FirewallClient:
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self.auto_nets = []
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argv0 = sys.argv[0]
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# if argv0 is a not python script, it shall be an executable.
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# In windows it will be a .exe file and other platforms it will be a shebang script
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# argv0 is either be a normal python file or an executable.
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# After installed as a package, sshuttle command points to an .exe in Windows and python shebang script elsewhere.
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argvbase = (([sys.executable, sys.argv[0]] if argv0.endswith('.py') else [argv0]) +
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['-v'] * (helpers.verbose or 0) +
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['--method', method_name] +
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@ -234,7 +234,7 @@ class FirewallClient:
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# Because underlying ShellExecute() Windows api does not allow child process to inherit stdio.
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# TODO(nom3ad): Try to implement another way to achieve this.
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raise Fatal("Privilege elevation for Windows is not yet implemented. Please run from an administrator shell")
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else:
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# Linux typically uses sudo; OpenBSD uses doas. However, some
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# Linux distributions are starting to use doas.
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sudo_cmd = ['sudo', '-p', '[local sudo] Password: ']
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@ -874,7 +874,7 @@ def main(listenip_v6, listenip_v4,
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# listenip_v4 contains user specified value or it is set to "auto".
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if listenip_v4 == "auto":
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listenip_v4 = ('127.0.0.1' if avail.loopback_port else '0.0.0.0', 0)
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listenip_v4 = ('127.0.0.1' if avail.loopback_proxy_port else '0.0.0.0', 0)
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debug1("Using default IPv4 listen address " + listenip_v4[0])
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# listenip_v6 is...
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@ -885,7 +885,7 @@ def main(listenip_v6, listenip_v4,
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debug1("IPv6 disabled by --disable-ipv6")
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if listenip_v6 == "auto":
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if avail.ipv6:
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listenip_v6 = ('::1' if avail.loopback_port else '::', 0)
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listenip_v6 = ('::1' if avail.loopback_proxy_port else '::', 0)
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debug1("IPv6 enabled: Using default IPv6 listen address " + listenip_v6[0])
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else:
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debug1("IPv6 disabled since it isn't supported by method "
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@ -242,7 +242,7 @@ def is_admin_user():
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except Exception:
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return False
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# TODO(nom3ad): for sys.platform == 'linux', support capabilities check for non-root users. (CAP_NET_ADMIN might be enough?)
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# TODO(nom3ad): for sys.platform == 'linux', check capabilities for non-root users. (CAP_NET_ADMIN might be enough?)
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return os.getuid() == 0
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@ -46,7 +46,7 @@ class BaseMethod(object):
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@staticmethod
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def get_supported_features():
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result = Features()
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result.loopback_port = True
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result.loopback_proxy_port = True
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result.ipv4 = True
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result.ipv6 = False
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result.udp = False
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@ -15,7 +15,7 @@ import traceback
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from sshuttle.methods import BaseMethod
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from sshuttle.helpers import debug3, log, debug1, debug2, get_verbose_level, Fatal
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from sshuttle.helpers import debug3, debug1, debug2, get_verbose_level, Fatal
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try:
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# https://reqrypt.org/windivert-doc.html#divert_iphdr
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@ -47,6 +47,10 @@ class IPFamily(IntEnum):
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IPv4 = socket.AF_INET
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IPv6 = socket.AF_INET6
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@staticmethod
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def from_ip_version(version):
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return IPFamily.IPv6 if version == 4 else IPFamily.IPv4
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@property
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def filter(self):
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return "ip" if self == socket.AF_INET else "ipv6"
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@ -280,7 +284,7 @@ class Method(BaseMethod):
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def __init__(self, name):
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super().__init__(name)
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def _get_bind_addresses_for_port(self, port, family):
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def _get_bind_address_for_port(self, port, family):
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proto = "TCPv6" if family.version == 6 else "TCP"
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for line in subprocess.check_output(["netstat", "-a", "-n", "-p", proto]).decode().splitlines():
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try:
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@ -293,7 +297,7 @@ class Method(BaseMethod):
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raise Fatal("Could not find listening address for {}/{}".format(port, proto))
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def setup_firewall(self, proxy_port, dnsport, nslist, family, subnets, udp, user, group, tmark):
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log(f"{proxy_port=}, {dnsport=}, {nslist=}, {family=}, {subnets=}, {udp=}, {user=}, {tmark=}")
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debug2(f"{proxy_port=}, {dnsport=}, {nslist=}, {family=}, {subnets=}, {udp=}, {user=}, {tmark=}")
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if nslist or user or udp:
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raise NotImplementedError()
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@ -304,18 +308,21 @@ class Method(BaseMethod):
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# using loopback only proxy binding won't work with windivert.
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# See: https://github.com/basil00/Divert/issues/17#issuecomment-341100167 https://github.com/basil00/Divert/issues/82)
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# As a workaround, finding another interface ip instead. (client should not bind proxy to loopback address)
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local_addr = self._get_bind_addresses_for_port(proxy_port, family)
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for addr in (ip_address(info[4][0]) for info in socket.getaddrinfo(socket.gethostname(), None)):
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if addr.version != family.version or addr.is_loopback or addr.is_link_local:
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continue
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if local_addr.is_unspecified or local_addr == addr:
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proxy_bind_addr = self._get_bind_address_for_port(proxy_port, family)
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if proxy_bind_addr.is_loopback:
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raise Fatal("Windivert method requires proxy to be reachable by a non loopback address.")
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if not proxy_bind_addr.is_unspecified:
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proxy_ip = proxy_bind_addr.exploded
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else:
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local_addresses = [ip_address(info[4][0]) for info in socket.getaddrinfo(socket.gethostname(), 0, family=family)]
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for addr in local_addresses:
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if not addr.is_loopback and not addr.is_link_local:
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proxy_ip = addr.exploded
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debug2("Found non loopback address to connect to proxy: " + proxy_ip)
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break
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else:
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raise Fatal("Windivert method requires proxy to be reachable by a non loopback address."
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f"No addersss found for {family.name}")
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f"No address found for {family.name} in {local_addresses}")
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debug2("Found non loopback address to connect to proxy: " + proxy_ip)
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subnet_addresses = []
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for (_, mask, exclude, network_addr, fport, lport) in subnets:
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if exclude:
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@ -357,9 +364,11 @@ class Method(BaseMethod):
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def get_supported_features(self):
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result = super(Method, self).get_supported_features()
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result.loopback_port = False
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result.loopback_proxy_port = False
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result.user = False
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result.dns = False
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# ipv6 only able to support with Windivert 2.x due to bugs in filter parsing
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# TODO(nom3ad): Enable ipv6 once https://github.com/ffalcinelli/pydivert/pull/57 merged
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result.ipv6 = False
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return result
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@ -463,19 +472,20 @@ class Method(BaseMethod):
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for pkt in w:
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verbose >= 3 and debug3("[INGRESS] " + repr_pkt(pkt))
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if pkt.tcp.syn and pkt.tcp.ack:
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# SYN+ACK received (connection established)
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# SYN+ACK received (connection established from proxy
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conn = self.conntrack.update(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port, ConnState.TCP_ESTABLISHED)
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elif pkt.tcp.rst:
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# RST received - Abrupt connection teardown initiated by otherside. We don't expect anymore packets
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# RST received - Abrupt connection teardown initiated by proxy. Don't expect anymore packets
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conn = self.conntrack.remove(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port)
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# https://wiki.wireshark.org/TCP-4-times-close.md
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elif pkt.tcp.fin and pkt.tcp.ack:
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# FIN+ACK received (Passive close by otherside. We don't expect any more packets. Otherside expects an ACK)
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# FIN+ACK received (Passive close by proxy. Don't expect any more packets. proxy expects an ACK)
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conn = self.conntrack.remove(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port)
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elif pkt.tcp.fin:
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# FIN received (Otherside initiated graceful close. We expects a final ACK for a FIN packet)
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# FIN received (proxy initiated graceful close. Expect a final ACK for a FIN packet)
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conn = self.conntrack.update(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port, ConnState.TCP_CLOSE_WAIT)
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else:
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# data fragments and ACKs
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conn = self.conntrack.get(socket.IPPROTO_TCP, pkt.dst_addr, pkt.dst_port)
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if not conn:
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verbose >= 2 and debug2("Unexpected packet: " + repr_pkt(pkt))
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@ -262,7 +262,7 @@ def connect(ssh_cmd, rhostport, python, stderr, add_cmd_delimiter, options):
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threading.Thread(target=stream_sock_to_stdin, name='stream_sock_to_stdin', daemon=True).start()
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return s2.makefile("rb", buffering=0), s2.makefile("wb", buffering=0)
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# https://stackoverflow.com/questions/48671215/howto-workaround-of-close-fds-true-and-redirect-stdout-stderr-on-windows
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# See: stackoverflow.com/questions/48671215/howto-workaround-of-close-fds-true-and-redirect-stdout-stderr-on-windows
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close_fds = False if sys.platform == 'win32' else True
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debug2("executing: %r" % argv)
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