def socks_connect(self, connect_to):
try:
client_greet = socks.ClientGreeting(
socks.VERSION.SOCKS5,
[socks.METHOD.NO_AUTHENTICATION_REQUIRED])
client_greet.to_file(self.wfile)
self.wfile.flush()
server_greet = socks.ServerGreeting.from_file(self.rfile)
server_greet.assert_socks5()
if server_greet.method != socks.METHOD.NO_AUTHENTICATION_REQUIRED:
raise socks.SocksError(
socks.METHOD.NO_ACCEPTABLE_METHODS,
"pathoc only supports SOCKS without authentication")
connect_request = socks.Message(
socks.VERSION.SOCKS5,
socks.CMD.CONNECT,
socks.ATYP.DOMAINNAME,
connect_to,
)
connect_request.to_file(self.wfile)
self.wfile.flush()
connect_reply = socks.Message.from_file(self.rfile)
connect_reply.assert_socks5()
if connect_reply.msg != socks.REP.SUCCEEDED:
raise socks.SocksError(connect_reply.msg, "SOCKS server error")
except (socks.SocksError, exceptions.TcpDisconnect) as e:
raise PathocError(str(e))
def __call__(self):
try:
# Parse Client Greeting
client_greet = socks.ClientGreeting.from_file(
self.client_conn.rfile, fail_early=True)
client_greet.assert_socks5()
if socks.METHOD.NO_AUTHENTICATION_REQUIRED not in client_greet.methods:
raise socks.SocksError(
socks.METHOD.NO_ACCEPTABLE_METHODS,
"mitmproxy only supports SOCKS without authentication")
# Send Server Greeting
server_greet = socks.ServerGreeting(
socks.VERSION.SOCKS5, socks.METHOD.NO_AUTHENTICATION_REQUIRED)
server_greet.to_file(self.client_conn.wfile)
self.client_conn.wfile.flush()
# Parse Connect Request
connect_request = socks.Message.from_file(self.client_conn.rfile)
connect_request.assert_socks5()
if connect_request.msg != socks.CMD.CONNECT:
raise socks.SocksError(
socks.REP.COMMAND_NOT_SUPPORTED,
"mitmproxy only supports SOCKS5 CONNECT.")
# We always connect lazily, but we need to pretend to the client that we connected.
connect_reply = socks.Message(
socks.VERSION.SOCKS5,
socks.REP.SUCCEEDED,
connect_request.atyp,
# dummy value, we don't have an upstream connection yet.
connect_request.addr)
connect_reply.to_file(self.client_conn.wfile)
self.client_conn.wfile.flush()
except (socks.SocksError, exceptions.TcpException) as e:
raise exceptions.Socks5ProtocolException(
"SOCKS5 mode failure: %s" % repr(e))
self.server_conn.address = connect_request.addr
layer = self.ctx.next_layer(self)
try:
layer()
finally:
if self.server_conn.connected():
self.disconnect()
