commit e8a2eb04ba430562b81db7ba4d36c60915de189c Author: Quinn Jarrell qjarrell@gosynapsify.com Date: Mon Jun 30 18:31:46 2014 -0400

Proxy shims now detect what type of protocol each PT needs, SOCKS4 or SOCKS5. --- obfs-flash-client | 50 +++++++++++++++++++++++++++++++++----------------- torrc | 2 +- 2 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/obfs-flash-client b/obfs-flash-client index 6bfa2a0..1c2267d 100755 --- a/obfs-flash-client +++ b/obfs-flash-client @@ -23,7 +23,7 @@ from twisted.internet.endpoints import TCP4ClientEndpoint from twisted.protocols.basic import LineReceiver from twisted.protocols.portforward import ProxyServer as _ProxyServer from twisted.python import log -from txsocksx.client import SOCKS4ClientEndpoint +from txsocksx.client import SOCKS4ClientEndpoint, SOCKS5ClientEndpoint from fog.socks import SOCKSv4InterceptorFactory

import shlex @@ -165,18 +165,22 @@ class ProxyServer(_ProxyServer): def connectProxyClient(self, client): raise NotImplementedError()

-class OneUseSOCKS4Wrapper(ProxyServer): +class OneUseSOCKSWrapper(ProxyServer):

def connectProxyClient(self, client): + local_host, local_port = self.factory.method_spec.addrport TCPPoint = TCP4ClientEndpoint( self.reactor, - self.factory.local_host, - self.factory.local_port) - SOCKSPoint = SOCKS4ClientEndpoint( - self.factory.remote_host, - self.factory.remote_port, - TCPPoint) - # Store port for debugging messages before stopListening is called. listen_port will not have a port after stopListening is called. + local_host, + local_port) + # Next PT may need either SOCKS4 or SOCKS5 so check its protocol and get the required class + socks_endpoint_class = self.getSocksEndpointClass() + SOCKSPoint = socks_endpoint_class( + self.factory.remote_host, + self.factory.remote_port, + TCPPoint) + # Store port for debugging messages before stopListening is called. + # listen_port will not have a port after stopListening is called. stored_port = self.factory.listen_port.getHost().port d_port_closed = self.factory.listen_port.stopListening() d_port_closed.addCallback( @@ -189,23 +193,35 @@ class OneUseSOCKS4Wrapper(ProxyServer): def _gotError(error): log.err(error, "error connecting to SOCKS server")

-class OneUseSOCKS4Factory(Factory): - protocol = OneUseSOCKS4Wrapper + def getSocksEndpointClass(self): + """ + Checks self.factory.method_spec.protocol and returns the appropriate socks endpoint class. + """ + socks_endpoint_class = None + if self.factory.method_spec.protocol == 'socks4': + socks_endpoint_class = SOCKS4ClientEndpoint + elif self.factory.method_spec.protocol == 'socks5': + socks_endpoint_class = SOCKS5ClientEndpoint + else: + raise ValueError("Pluggable transport requires unknown protocol %s. Supported protocols are %s" % + (self.factory.method_spec.protocol, ('socks4', 'socks5'))) + return socks_endpoint_class

- def __init__(self, local_host, local_port, remote_host, remote_port): +class OneUseSOCKSFactory(Factory): + protocol = OneUseSOCKSWrapper + def __init__(self, method_spec, remote_host, remote_port): self._connected_once = False - self.local_host = local_host - self.local_port = local_port + self.method_spec = method_spec self.remote_host = remote_host self.remote_port = remote_port self.d_connected = Deferred() self.listen_port = None

def __str__(self): - return "OneUseSOCKS4Factory connecting %s:%s to %s:%s" % (self.local_host, self.local_port, self.remote_host, self.remote_port) + return "OneUseSOCKSFactory connecting %s to %s:%s" % (self.method_spec, self.remote_host, self.remote_port)

def __repr__(self): - return "OneUseSOCKS4Factory(%s, %s, %s, %s)" % (self.local_host, self.local_port, self.remote_host, self.remote_port) + return "OneUseSOCKSFactory(%s, %s, %s)" % (self.method_spec, self.remote_host, self.remote_port)

def setListenPort(self, listen_port): """ @@ -313,7 +329,7 @@ def pt_setup_socks_shim(pt_name, pt_chain, success_list, dest_address, dest_port :returns twisted.internet.interfaces.IListeningPort: An IListeningPort used for shutting down a factory after a connection is made. """ methodspec = [r[1] for r in success_list if r[1].name == pt_name][0] # Returns the resulting methodspec. - factory = OneUseSOCKS4Factory(methodspec.addrport[0], methodspec.addrport[1], dest_address, dest_port) + factory = OneUseSOCKSFactory(methodspec, dest_address, dest_port) # TODO switch to using endpoints instead of listenTCP proxy_server = reactor.listenTCP(interface='127.0.0.1', port=0, factory=factory) factory.setListenPort(proxy_server) diff --git a/torrc b/torrc index 80da3f3..42560c1 100644 --- a/torrc +++ b/torrc @@ -1,5 +1,5 @@ UseBridges 1 -Bridge obfs3_flashproxy 127.0.0.1:0 +Bridge obfs3_flashproxy 127.0.0.1:9000 LearnCircuitBuildTimeout 0 CircuitBuildTimeout 300 ClientTransportPlugin obfs3_flashproxy exec ./obfs-flash-client --fp-arg=--register