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This commit is contained in:
nom3ad
2022-09-07 12:26:21 +05:30
committed by Brian May
parent 7da3b024dd
commit 482e0cbd00
7 changed files with 172 additions and 110 deletions
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7
sshuttle/client.py
View File

@ -260,8 +260,7 @@ class FirewallClient:
# If we can find doas and not sudo or if we are on
# OpenBSD, try using doas first.
if (doas_path and not sudo_path) or \
platform.platform().startswith('OpenBSD'):
if (doas_path and not sudo_path) or platform.platform().startswith('OpenBSD'):
argv_tries = [doas_cmd, sudo_cmd, argvbase]
else:
argv_tries = [sudo_cmd, doas_cmd, argvbase]
@ -282,9 +281,11 @@ class FirewallClient:
pstdout = s1
pstdin = s1
penv = None
def preexec_fn():
# run in the child process
s2.close()
def get_pfile():
s1.close()
return s2.makefile('rwb')
@ -296,6 +297,7 @@ class FirewallClient:
preexec_fn = None
penv = os.environ.copy()
penv['PYTHONPATH'] = os.path.dirname(os.path.dirname(__file__))
def get_pfile():
import base64
socket_share_data = s1.share(self.p.pid)
@ -318,7 +320,6 @@ class FirewallClient:
'Command=%r Exception=%s' % (argv, e))
continue
self.argv = argv
self.pfile = get_pfile()
try:

4
sshuttle/firewall.py
View File

@ -130,11 +130,13 @@ def _setup_daemon_windows():
sock.close()
return sys.stdin, sys.stdout
if sys.platform == 'win32':
setup_daemon = _setup_daemon_windows
else:
setup_daemon = _setup_daemon_unix
# Note that we're sorting in a very particular order:
# we need to go from smaller, more specific, port ranges, to larger,
# less-specific, port ranges. At each level, we order by subnet
@ -217,7 +219,7 @@ def main(method_name, syslog):
if not line:
# parent probably exited
return
except IOError:
except IOError as e:
# On windows, this ConnectionResetError is thrown when parent process closes it's socket pair end
debug3('read from stdin failed: %s' % (e,))
return

3
sshuttle/helpers.py
View File

@ -224,13 +224,14 @@ def which(file, mode=os.F_OK | os.X_OK):
debug2("which() could not find '%s' in %s" % (file, path))
return rv
def is_admin_user():
if sys.platform == 'win32':
import ctypes
# https://stackoverflow.com/questions/130763/request-uac-elevation-from-within-a-python-script/41930586#41930586
try:
return ctypes.windll.shell32.IsUserAnAdmin()
except:
except Exception:
return False
return os.getuid() == 0

179
sshuttle/methods/windivert.py
View File

@ -11,31 +11,34 @@ from enum import IntEnum
import time
import traceback
try:
import pydivert
except ImportError:
raise Fatal('Could not import pydivert module. windivert requires https://pypi.org/project/pydivert')
from sshuttle.methods import BaseMethod
from sshuttle.helpers import debug3, log, debug1, debug2, Fatal
try:
# https://reqrypt.org/windivert-doc.html#divert_iphdr
import pydivert
except ImportError:
raise Exception("Could not import pydivert module. windivert requires https://pypi.org/project/pydivert")
ConnectionTuple = namedtuple(
"ConnectionTuple", ["protocol", "ip_version", "src_addr", "src_port", "dst_addr", "dst_port", "state_epoch", 'state']
"ConnectionTuple",
["protocol", "ip_version", "src_addr", "src_port", "dst_addr", "dst_port", "state_epoch", "state"],
)
WINDIVERT_MAX_CONNECTIONS = 10_000
class IPProtocol(IntEnum):
TCP = socket.IPPROTO_TCP
UDP = socket.IPPROTO_UDP
@property
def filter(self):
return 'tcp' if self == IPProtocol.TCP else 'udp'
return "tcp" if self == IPProtocol.TCP else "udp"
class IPFamily(IntEnum):
IPv4 = socket.AF_INET
@ -43,7 +46,7 @@ class IPFamily(IntEnum):
@property
def filter(self):
return 'ip' if self == socket.AF_INET else 'ipv6'
return "ip" if self == socket.AF_INET else "ipv6"
@property
def version(self):
@ -51,7 +54,7 @@ class IPFamily(IntEnum):
@property
def loopback_addr(self):
return '127.0.0.1' if self == socket.AF_INET else '::1'
return "127.0.0.1" if self == socket.AF_INET else "::1"
class ConnState(IntEnum):
@ -70,27 +73,34 @@ def repr_pkt(p):
if p.tcp:
t = p.tcp
r += f" {len(t.payload)}B ("
r += '+'.join(f.upper() for f in ('fin','syn', "rst", "psh", 'ack', 'urg', 'ece', 'cwr', 'ns') if getattr(t, f))
r += f') SEQ#{t.seq_num}'
r += "+".join(
f.upper() for f in ("fin", "syn", "rst", "psh", "ack", "urg", "ece", "cwr", "ns") if getattr(t, f)
)
r += f") SEQ#{t.seq_num}"
if t.ack:
r += f' ACK#{t.ack_num}'
r += f' WZ={t.window_size}'
r += f" ACK#{t.ack_num}"
r += f" WZ={t.window_size}"
else:
r += f" {p.udp=} {p.icmpv4=} {p.icmpv6=}"
return f"<Pkt {r}>"
def synchronized_method(lock):
def decorator(method):
@wraps(method)
def wrapped(self, *args, **kwargs):
with getattr(self, lock):
return method(self, *args, **kwargs)
return wrapped
return decorator
class ConnTrack:
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = object.__new__(cls)
@ -98,13 +108,15 @@ class ConnTrack:
raise RuntimeError("ConnTrack can not be instantiated multiple times")
def __init__(self, name, max_connections=0) -> None:
self.struct_full_tuple = struct.Struct('>' + ''.join(('B', 'B', '16s', 'H', '16s', 'H', 'L', 'B')))
self.struct_src_tuple = struct.Struct('>' + ''.join(('B', 'B', '16s', 'H')))
self.struct_state_tuple = struct.Struct('>' + ''.join(('L', 'B')))
self.struct_full_tuple = struct.Struct(">" + "".join(("B", "B", "16s", "H", "16s", "H", "L", "B")))
self.struct_src_tuple = struct.Struct(">" + "".join(("B", "B", "16s", "H")))
self.struct_state_tuple = struct.Struct(">" + "".join(("L", "B")))
try:
self.max_connections = max_connections
self.shm_list = shared_memory.ShareableList([bytes(self.struct_full_tuple.size) for _ in range(max_connections)], name=name)
self.shm_list = shared_memory.ShareableList(
[bytes(self.struct_full_tuple.size) for _ in range(max_connections)], name=name
)
self.is_owner = True
self.next_slot = 0
self.used_slots = set()
@ -114,9 +126,12 @@ class ConnTrack:
self.shm_list = shared_memory.ShareableList(name=name)
self.max_connections = len(self.shm_list)
debug2(f"ConnTrack: is_owner={self.is_owner} entry_size={self.struct_full_tuple.size} shm_name={self.shm_list.shm.name} shm_size={self.shm_list.shm.size}B")
debug2(
f"ConnTrack: is_owner={self.is_owner} entry_size={self.struct_full_tuple.size} shm_name={self.shm_list.shm.name} "
f"shm_size={self.shm_list.shm.size}B"
)
@synchronized_method('rlock')
@synchronized_method("rlock")
def add(self, proto, src_addr, src_port, dst_addr, dst_port, state):
if not self.is_owner:
raise RuntimeError("Only owner can mutate ConnTrack")
@ -143,9 +158,12 @@ class ConnTrack:
self.shm_list[self.next_slot] = packed
self.used_slots.add(self.next_slot)
proto = IPProtocol(proto)
debug3(f"ConnTrack: added ({proto.name} {src_addr}:{src_port}->{dst_addr}:{dst_port} @{state_epoch}:{state.name}) to slot={self.next_slot} | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: added ({proto.name} {src_addr}:{src_port}->{dst_addr}:{dst_port} @{state_epoch}:{state.name}) to "
f"slot={self.next_slot} | #ActiveConn={len(self.used_slots)}"
)
@synchronized_method('rlock')
@synchronized_method("rlock")
def update(self, proto, src_addr, src_port, state):
if not self.is_owner:
raise RuntimeError("Only owner can mutate ConnTrack")
@ -155,12 +173,18 @@ class ConnTrack:
if self.shm_list[i].startswith(packed):
state_epoch = int(time.time())
self.shm_list[i] = self.shm_list[i][:-5] + self.struct_state_tuple.pack(state_epoch, state)
debug3(f"ConnTrack: updated ({proto.name} {src_addr}:{src_port} @{state_epoch}:{state.name}) from slot={i} | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: updated ({proto.name} {src_addr}:{src_port} @{state_epoch}:{state.name}) from slot={i} | "
f"#ActiveConn={len(self.used_slots)}"
)
return self._unpack(self.shm_list[i])
else:
debug3(f"ConnTrack: ({proto.name} src={src_addr}:{src_port}) is not found to update to {state.name} | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: ({proto.name} src={src_addr}:{src_port}) is not found to update to {state.name} | "
f"#ActiveConn={len(self.used_slots)}"
)
@synchronized_method('rlock')
@synchronized_method("rlock")
def remove(self, proto, src_addr, src_port):
if not self.is_owner:
raise RuntimeError("Only owner can mutate ConnTrack")
@ -169,13 +193,18 @@ class ConnTrack:
for i in self.used_slots:
if self.shm_list[i].startswith(packed):
conn = self._unpack(self.shm_list[i])
self.shm_list[i] = b''
self.shm_list[i] = b""
self.used_slots.remove(i)
debug3(f"ConnTrack: removed ({proto.name} src={src_addr}:{src_port} state={conn.state.name}) from slot={i} | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: removed ({proto.name} src={src_addr}:{src_port} state={conn.state.name}) from slot={i} | "
f"#ActiveConn={len(self.used_slots)}"
)
return conn
else:
debug3(f"ConnTrack: ({proto.name} src={src_addr}:{src_port}) is not found to remove | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: ({proto.name} src={src_addr}:{src_port}) is not found to remove |"
f" #ActiveConn={len(self.used_slots)}"
)
def get(self, proto, src_addr, src_port):
src_addr = ipaddress.ip_address(src_addr)
@ -184,7 +213,7 @@ class ConnTrack:
if entry and entry.startswith(packed):
return self._unpack(entry)
@synchronized_method('rlock')
@synchronized_method("rlock")
def gc(self, connection_timeout_sec=15):
now = int(time.time())
n = 0
@ -195,22 +224,37 @@ class ConnTrack:
continue
if ConnState.can_timeout(state):
conn = self._unpack(self.shm_list[i])
self.shm_list[i] = b''
self.shm_list[i] = b""
self.used_slots.remove(i)
n += 1
debug3(f"ConnTrack: GC: removed ({conn.protocol.name} src={conn.src_addr}:{conn.src_port} state={conn.state.name}) from slot={i} | #ActiveConn={len(self.used_slots)}")
debug3(
f"ConnTrack: GC: removed ({conn.protocol.name} src={conn.src_addr}:{conn.src_port} state={conn.state.name})"
f" from slot={i} | #ActiveConn={len(self.used_slots)}"
)
debug3(f"ConnTrack: GC: collected {n} connections | #ActiveConn={len(self.used_slots)}")
def _unpack(self, packed):
(proto, ip_version, src_addr_packed, src_port, dst_addr_packed, dst_port, state_epoch, state) = self.struct_full_tuple.unpack(packed)
(
proto,
ip_version,
src_addr_packed,
src_port,
dst_addr_packed,
dst_port,
state_epoch,
state,
) = self.struct_full_tuple.unpack(packed)
dst_addr = str(ipaddress.ip_address(dst_addr_packed if ip_version == 6 else dst_addr_packed[:4]))
src_addr = str(ipaddress.ip_address(src_addr_packed if ip_version == 6 else src_addr_packed[:4]))
return ConnectionTuple(IPProtocol(proto), ip_version, src_addr, src_port, dst_addr, dst_port, state_epoch, ConnState(state))
return ConnectionTuple(
IPProtocol(proto), ip_version, src_addr, src_port, dst_addr, dst_port, state_epoch, ConnState(state)
)
def __iter__(self):
def conn_iter():
for i in self.used_slots:
yield self._unpack(self.shm_list[i])
return conn_iter()
def __repr__(self):
@ -226,8 +270,7 @@ class Method(BaseMethod):
def __init__(self, name):
super().__init__(name)
def setup_firewall(self, port, dnsport, nslist, family, subnets, udp,
user, tmark):
def setup_firewall(self, port, dnsport, nslist, family, subnets, udp, user, tmark):
log(f"{port=}, {dnsport=}, {nslist=}, {family=}, {subnets=}, {udp=}, {user=}, {tmark=}")
if nslist or user or udp:
@ -235,7 +278,8 @@ class Method(BaseMethod):
family = IPFamily(family)
# using loopback proxy address never worked. See: https://github.com/basil00/Divert/issues/17#issuecomment-341100167 ,https://github.com/basil00/Divert/issues/82)
# using loopback proxy address never worked.
# See: https://github.com/basil00/Divert/issues/17#issuecomment-341100167 ,https://github.com/basil00/Divert/issues/82)
# As a workaround we use another interface ip instead.
# self.proxy_addr[family] = family.loopback_addr
for addr in (ipaddress.ip_address(info[4][0]) for info in socket.getaddrinfo(socket.gethostname(), None)):
@ -252,36 +296,36 @@ class Method(BaseMethod):
for (_, mask, exclude, network_addr, fport, lport) in subnets:
if exclude:
continue
assert fport == 0, 'custom port range not supported'
assert lport == 0, 'custom port range not supported'
assert fport == 0, "custom port range not supported"
assert lport == 0, "custom port range not supported"
subnet_addresses.append("%s/%s" % (network_addr, mask))
self.network_config[family] = {
'subnets': subnet_addresses,
"subnets": subnet_addresses,
"nslist": nslist,
}
def wait_for_firewall_ready(self):
debug2(f"network_config={self.network_config} proxy_addr={self.proxy_addr}")
self.conntrack = ConnTrack(f'sshuttle-windivert-{os.getppid()}', WINDIVERT_MAX_CONNECTIONS)
self.conntrack = ConnTrack(f"sshuttle-windivert-{os.getppid()}", WINDIVERT_MAX_CONNECTIONS)
methods = (self._egress_divert, self._ingress_divert, self._connection_gc)
ready_events = []
for fn in methods:
ev = threading.Event()
ready_events.append(ev)
def _target():
try:
fn(ev.set)
except:
debug2(f'thread {fn.__name__} exiting due to: ' + traceback.format_exc())
except Exception:
debug2(f"thread {fn.__name__} exiting due to: " + traceback.format_exc())
sys.stdin.close() # this will exist main thread
sys.stdout.close()
threading.Thread(name=fn.__name__, target=_target, daemon=True).start()
for ev in ready_events:
if not ev.wait(5): # at most 5 sec
raise Fatal(f"timeout in wait_for_firewall_ready()")
raise Fatal("timeout in wait_for_firewall_ready()")
def restore_firewall(self, port, family, udp, user):
pass
@ -294,8 +338,8 @@ class Method(BaseMethod):
return result
def get_tcp_dstip(self, sock):
if not hasattr(self, 'conntrack'):
self.conntrack = ConnTrack(f'sshuttle-windivert-{os.getpid()}')
if not hasattr(self, "conntrack"):
self.conntrack = ConnTrack(f"sshuttle-windivert-{os.getpid()}")
src_addr, src_port = sock.getpeername()
c = self.conntrack.get(IPProtocol.TCP, src_addr, src_port)
@ -304,7 +348,7 @@ class Method(BaseMethod):
return (c.dst_addr, c.dst_port)
def is_supported(self):
if sys.platform == 'win32':
if sys.platform == "win32":
return True
return False
@ -316,7 +360,7 @@ class Method(BaseMethod):
family_filters = []
for af, c in self.network_config.items():
subnet_filters = []
for cidr in c['subnets']:
for cidr in c["subnets"]:
ip_network = ipaddress.ip_network(cidr)
first_ip = ip_network.network_address
last_ip = ip_network.broadcast_address
@ -333,11 +377,21 @@ class Method(BaseMethod):
proxy_addr_ipv6 = self.proxy_addr[IPFamily.IPv6]
for pkt in w:
debug3(">>> " + repr_pkt(pkt))
if pkt.tcp.syn and not pkt.tcp.ack: # SYN sent (start of 3-way handshake connection establishment from our side, we wait for SYN+ACK)
self.conntrack.add(socket.IPPROTO_TCP, pkt.src_addr, pkt.src_port, pkt.dst_addr, pkt.dst_port, ConnState.TCP_SYN_SENT)
if pkt.tcp.fin: # FIN sent (start of graceful close our side, and we wait for ACK)
if pkt.tcp.syn and not pkt.tcp.ack:
# SYN sent (start of 3-way handshake connection establishment from our side, we wait for SYN+ACK)
self.conntrack.add(
socket.IPPROTO_TCP,
pkt.src_addr,
pkt.src_port,
pkt.dst_addr,
pkt.dst_port,
ConnState.TCP_SYN_SENT,
)
if pkt.tcp.fin:
# FIN sent (start of graceful close our side, and we wait for ACK)
self.conntrack.update(IPProtocol.TCP, pkt.src_addr, pkt.src_port, ConnState.TCP_FIN_WAIT_1)
if pkt.tcp.rst : # RST sent (initiate abrupt connection teardown from our side, so we don't expect any reply)
if pkt.tcp.rst:
# RST sent (initiate abrupt connection teardown from our side, so we don't expect any reply)
self.conntrack.remove(IPProtocol.TCP, pkt.src_addr, pkt.src_port)
# DNAT
@ -347,18 +401,19 @@ class Method(BaseMethod):
pkt.dst_addr = proxy_addr_ipv6
pkt.tcp.dst_port = proxy_port
# XXX: If we set loopback proxy address (DNAT), then we should do SNAT as well by setting src_addr to loopback address.
# Otherwise injecting packet will be ignored by Windows network stack as teh packet has to cross public to private address space.
# XXX: If we set loopback proxy address (DNAT), then we should do SNAT as well
# by setting src_addr to loopback address.
# Otherwise injecting packet will be ignored by Windows network stack
# as they packet has to cross public to private address space.
# See: https://github.com/basil00/Divert/issues/82
# Managing SNAT is more trickier, as we have to restore the original source IP address for reply packets.
# >>> pkt.dst_addr = proxy_addr_ipv4
w.send(pkt, recalculate_checksum=True)
def _ingress_divert(self, ready_cb):
proto = IPProtocol.TCP
direction = 'inbound' # only when proxy address is not loopback address (Useful for testing)
direction = "inbound" # only when proxy address is not loopback address (Useful for testing)
ip_filters = []
for addr in (ipaddress.ip_address(a) for a in self.proxy_addr.values() if a):
if addr.is_loopback: # Windivert treats all loopback traffic as outbound
@ -374,14 +429,18 @@ class Method(BaseMethod):
ready_cb()
for pkt in w:
debug3("<<< " + repr_pkt(pkt))
if pkt.tcp.syn and pkt.tcp.ack: # SYN+ACK received (connection established)
if pkt.tcp.syn and pkt.tcp.ack:
# SYN+ACK received (connection established)
conn = self.conntrack.update(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port, ConnState.TCP_ESTABLISHED)
elif pkt.tcp.rst: # RST received - Abrupt connection teardown initiated by other side. We don't expect anymore packets
elif pkt.tcp.rst:
# RST received - Abrupt connection teardown initiated by otherside. We don't expect anymore packets
conn = self.conntrack.remove(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port)
# https://wiki.wireshark.org/TCP-4-times-close.md
elif pkt.tcp.fin and pkt.tcp.ack: # FIN+ACK received (Passive close by other side. We don't expect any more packets. Other side expects an ACK)
elif pkt.tcp.fin and pkt.tcp.ack:
# FIN+ACK received (Passive close by otherside. We don't expect any more packets. Otherside expects an ACK)
conn = self.conntrack.remove(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port)
elif pkt.tcp.fin: # FIN received (Other side initiated graceful close. We expects a final ACK for a FIN packet)
elif pkt.tcp.fin:
# FIN received (Otherside initiated graceful close. We expects a final ACK for a FIN packet)
conn = self.conntrack.update(IPProtocol.TCP, pkt.dst_addr, pkt.dst_port, ConnState.TCP_CLOSE_WAIT)
else:
conn = self.conntrack.get(socket.IPPROTO_TCP, pkt.dst_addr, pkt.dst_port)

3
sshuttle/ssh.py
View File

@ -204,9 +204,9 @@ def connect(ssh_cmd, rhostport, python, stderr, add_cmd_delimiter, options):
raise Fatal("Failed to find '%s' in path %s" % (argv[0], get_path()))
argv[0] = abs_path
if sys.platform != 'win32':
(s1, s2) = socket.socketpair()
def preexec_fn():
# runs in the child process
s2.close()
@ -222,6 +222,7 @@ def connect(ssh_cmd, rhostport, python, stderr, add_cmd_delimiter, options):
preexec_fn = None
pstdin = ssubprocess.PIPE
pstdout = ssubprocess.PIPE
def get_serversock():
import threading

6
sshuttle/ssnet.py
View File

@ -477,11 +477,9 @@ class Mux(Handler):
# If LATENCY_BUFFER_SIZE is inappropriately large, we will
# get a MemoryError here. Read no more than 1MiB.
if sys.platform == 'win32':
read = _nb_clean(self.rfile.raw._sock.recv,
min(1048576, LATENCY_BUFFER_SIZE))
read = _nb_clean(self.rfile.raw._sock.recv, min(1048576, LATENCY_BUFFER_SIZE))
else:
read = _nb_clean(os.read, self.rfile.fileno(),
min(1048576, LATENCY_BUFFER_SIZE))
read = _nb_clean(os.read, self.rfile.fileno(), min(1048576, LATENCY_BUFFER_SIZE))
except OSError:
_, e = sys.exc_info()[:2]
raise Fatal('other end: %r' % e)