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import sys
import os
import re
import socket
import zlib
import imp
import subprocess as ssubprocess
import shlex
import ipaddress
# ensure backwards compatiblity with python2.7
try:
from urllib.parse import urlparse
except ImportError:
from urlparse import urlparse
import sshuttle.helpers as helpers
from sshuttle.helpers import debug2
try:
# Python >= 3.5
from shlex import quote
except ImportError:
# Python 2.x
from pipes import quote
def readfile(name):
tokens = name.split(".")
f = None
token = tokens[0]
token_name = [token]
token_str = ".".join(token_name)
try:
f, pathname, description = imp.find_module(token_str)
for token in tokens[1:]:
module = imp.load_module(token_str, f, pathname, description)
if f is not None:
f.close()
token_name.append(token)
token_str = ".".join(token_name)
f, pathname, description = imp.find_module(
token, module.__path__)
if f is not None:
contents = f.read()
else:
contents = ""
finally:
if f is not None:
f.close()
return contents.encode("UTF8")
def empackage(z, name, data=None):
if not data:
data = readfile(name)
content = z.compress(data)
content += z.flush(zlib.Z_SYNC_FLUSH)
return b'%s\n%d\n%s' % (name.encode("ASCII"), len(content), content)
def parse_hostport(rhostport):
"""
parses the given rhostport variable, looking like this:
[username[:password]@]host[:port]
if only host is given, can be a hostname, IPv4/v6 address or a ssh alias
from ~/.ssh/config
and returns a tuple (username, password, port, host)
"""
# default port for SSH is TCP port 22
port = 22
username = None
password = None
host = rhostport
if "@" in host:
# split username (and possible password) from the host[:port]
username, host = host.split("@")
# Fix #410 bad username error detect
# username cannot contain an @ sign in this scenario
if ":" in username:
# this will even allow for the username to be empty
username, password = username.split(":")
if ":" in host:
# IPv6 address and/or got a port specified
# If it is an IPv6 adress with port specification,
# then it will look like: [::1]:22
try:
# try to parse host as an IP adress,
# if that works it is an IPv6 address
host = ipaddress.ip_address(host)
except ValueError:
# if that fails parse as URL to get the port
parsed = urlparse('//{}'.format(host))
try:
host = ipaddress.ip_address(parsed.hostname)
except ValueError:
# else if both fails, we have a hostname with port
host = parsed.hostname
port = parsed.port
if password is None or len(password) == 0:
password = None
return username, password, port, host
def connect(ssh_cmd, rhostport, python, stderr, options):
username, password, port, host = parse_hostport(rhostport)
if username:
rhost = "{}@{}".format(username, host)
else:
rhost = host
z = zlib.compressobj(1)
content = readfile('sshuttle.assembler')
optdata = ''.join("%s=%r\n" % (k, v) for (k, v) in list(options.items()))
optdata = optdata.encode("UTF8")
content2 = (empackage(z, 'sshuttle') +
empackage(z, 'sshuttle.cmdline_options', optdata) +
empackage(z, 'sshuttle.helpers') +
empackage(z, 'sshuttle.ssnet') +
empackage(z, 'sshuttle.hostwatch') +
empackage(z, 'sshuttle.server') +
b"\n")
pyscript = r"""
import sys, os;
verbosity=%d;
sys.stdin = os.fdopen(0, "rb");
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.executable, '-c', pyscript]
else:
if ssh_cmd:
sshl = shlex.split(ssh_cmd)
else:
sshl = ['ssh']
if python:
pycmd = "'%s' -c '%s'" % (python, pyscript)
else:
pycmd = ("P=python3; $P -V 2>%s || P=python; "
"exec \"$P\" -c %s") % (os.devnull, quote(pyscript))
pycmd = ("/bin/sh -c {}".format(quote(pycmd)))
if password is not None:
os.environ['SSHPASS'] = str(password)
argv = (["sshpass", "-e"] + sshl +
["-p", str(port)] +
[rhost, '--', pycmd])
else:
argv = (sshl +
["-p", str(port)] +
[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
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