cleaner Exceptions, ssl -> tls, upstream proxy mode

14 files changed, 145 insertions, 68 deletions

diff --git a/libmproxy/exceptions.py b/libmproxy/exceptions.py
new file mode 100644
index 00000000..4d98c024
--- /dev/null
+++ b/libmproxy/exceptions.py
@@ -0,0 +1,22 @@
+from __future__ import (absolute_import, print_function, division)
+
+
+class ProxyException(Exception):
+    """
+    Base class for all exceptions thrown by libmproxy.
+    """
+    def __init__(self, message, cause=None):
+        """
+        :param message: Error Message
+        :param cause: Exception object that caused this exception to be thrown.
+        """
+        super(ProxyException, self).__init__(message)
+        self.cause = cause
+
+
+class ProtocolException(ProxyException):
+    pass
+
+
+class ServerException(ProxyException):
+    pass
\ No newline at end of file
diff --git a/libmproxy/protocol2/__init__.py b/libmproxy/protocol2/__init__.py
index 3f714f62..0d232b13 100644
--- a/libmproxy/protocol2/__init__.py
+++ b/libmproxy/protocol2/__init__.py
@@ -2,6 +2,7 @@ from __future__ import (absolute_import, print_function, division)
 from .layer import RootContext
 from .socks import Socks5IncomingLayer
 from .reverse_proxy import ReverseProxy
+from .upstream_proxy import UpstreamProxy
 from .rawtcp import TcpLayer
 from .auto import AutoLayer
-__all__ = ["Socks5IncomingLayer", "TcpLayer", "AutoLayer", "RootContext", "ReverseProxy"]
+__all__ = ["Socks5IncomingLayer", "TcpLayer", "AutoLayer", "RootContext", "ReverseProxy", "UpstreamProxy"]
diff --git a/libmproxy/protocol2/auto.py b/libmproxy/protocol2/auto.py
index fc111758..4a930720 100644
--- a/libmproxy/protocol2/auto.py
+++ b/libmproxy/protocol2/auto.py
@@ -10,11 +10,11 @@ class AutoLayer(Layer):
             return
         # TLS ClientHello magic, see http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello
         if d[0] == "\x16":
-            layer = SslLayer(self, True, True)
+            layer = TlsLayer(self, True, True)
         else:
             layer = TcpLayer(self)
         for m in layer():
             yield m
 
 from .rawtcp import TcpLayer
-from .ssl import SslLayer
+from .tls import TlsLayer
diff --git a/libmproxy/protocol2/layer.py b/libmproxy/protocol2/layer.py
index c18be83c..8aede22e 100644
--- a/libmproxy/protocol2/layer.py
+++ b/libmproxy/protocol2/layer.py
@@ -35,9 +35,10 @@ from __future__ import (absolute_import, print_function, division)
 import Queue
 import threading
 from netlib import tcp
-from ..proxy import ProxyError2, Log
+from ..proxy import Log
 from ..proxy.connection import ServerConnection
 from .messages import Connect, Reconnect, ChangeServer
+from ..exceptions import ProtocolException
 
 
 class RootContext(object):
@@ -51,6 +52,9 @@ class RootContext(object):
         self.channel = channel  # provides .ask() method to communicate with FlowMaster
         self.config = config  # Proxy Configuration
 
+    def next_layer(self):
+        print(type(self))
+
 
 class _LayerCodeCompletion(object):
     """
@@ -149,7 +153,7 @@ class ServerConnectionMixin(object):
         try:
             self.server_conn.connect()
         except tcp.NetLibError as e:
-            raise ProxyError2("Server connection to '%s' failed: %s" % (self.server_address, e), e)
+            raise ProtocolException("Server connection to '%s' failed: %s" % (self.server_address, e), e)
 
 
 def yield_from_callback(fun):
@@ -197,7 +201,7 @@ def yield_from_callback(fun):
                 break
             elif isinstance(msg, Exception):
                 # TODO: Include func name?
-                raise ProxyError2("Error in %s: %s" % (fun.__name__, repr(msg)), msg)
+                raise ProtocolException("Error in %s: %s" % (fun.__name__, repr(msg)), msg)
             else:
                 yield msg
                 yield_queue.put(None)
diff --git a/libmproxy/protocol2/messages.py b/libmproxy/protocol2/messages.py
index baf4312d..3f53fbd4 100644
--- a/libmproxy/protocol2/messages.py
+++ b/libmproxy/protocol2/messages.py
@@ -32,9 +32,9 @@ class ChangeServer(_Message):
     Change the upstream server.
     """
 
-    def __init__(self, address, server_ssl, sni, depth=1):
+    def __init__(self, address, server_tls, sni, depth=1):
         self.address = address
-        self.server_ssl = server_ssl
+        self.server_tls = server_tls
         self.sni = sni
 
         # upstream proxy scenario: you may want to change either the final target or the upstream proxy.
diff --git a/libmproxy/protocol2/rawtcp.py b/libmproxy/protocol2/rawtcp.py
index 39e48e24..608a53e3 100644
--- a/libmproxy/protocol2/rawtcp.py
+++ b/libmproxy/protocol2/rawtcp.py
@@ -1,4 +1,6 @@
 from __future__ import (absolute_import, print_function, division)
+import OpenSSL
+from ..exceptions import ProtocolException
 from ..protocol.tcp import TCPHandler
 from .layer import Layer
 from .messages import Connect
@@ -8,7 +10,11 @@ class TcpLayer(Layer):
     def __call__(self):
         yield Connect()
         tcp_handler = TCPHandler(self)
-        tcp_handler.handle_messages()
+        try:
+            tcp_handler.handle_messages()
+        except OpenSSL.SSL.Error as e:
+            raise ProtocolException("SSL error: %s" % repr(e), e)
+
 
     def establish_server_connection(self):
         pass
diff --git a/libmproxy/protocol2/reverse_proxy.py b/libmproxy/protocol2/reverse_proxy.py
index dfffd2f2..cb6d1d78 100644
--- a/libmproxy/protocol2/reverse_proxy.py
+++ b/libmproxy/protocol2/reverse_proxy.py
@@ -1,19 +1,19 @@
 from __future__ import (absolute_import, print_function, division)
 
 from .layer import Layer, ServerConnectionMixin
-from .ssl import SslLayer
+from .tls import TlsLayer
 
 
 class ReverseProxy(Layer, ServerConnectionMixin):
 
-    def __init__(self, ctx, server_address, client_ssl, server_ssl):
+    def __init__(self, ctx, server_address, client_tls, server_tls):
         super(ReverseProxy, self).__init__(ctx)
         self.server_address = server_address
-        self.client_ssl = client_ssl
-        self.server_ssl = server_ssl
+        self._client_tls = client_tls
+        self._server_tls = server_tls
 
     def __call__(self):
-        layer = SslLayer(self, self.client_ssl, self.server_ssl)
+        layer = TlsLayer(self, self._client_tls, self._server_tls)
         for message in layer():
             if not self._handle_server_message(message):
                 yield message
diff --git a/libmproxy/protocol2/socks.py b/libmproxy/protocol2/socks.py
index 14564521..1222ef5c 100644
--- a/libmproxy/protocol2/socks.py
+++ b/libmproxy/protocol2/socks.py
@@ -1,10 +1,10 @@
 from __future__ import (absolute_import, print_function, division)
 
-from ..proxy import ProxyError, Socks5ProxyMode, ProxyError2
+from ..exceptions import ProtocolException
+from ..proxy import ProxyError, Socks5ProxyMode
 from .layer import Layer, ServerConnectionMixin
 from .auto import AutoLayer
 
-
 class Socks5IncomingLayer(Layer, ServerConnectionMixin):
     def __call__(self):
         try:
@@ -12,7 +12,7 @@ class Socks5IncomingLayer(Layer, ServerConnectionMixin):
             address = s5mode.get_upstream_server(self.client_conn)[2:]
         except ProxyError as e:
             # TODO: Unmonkeypatch
-            raise ProxyError2(str(e), e)
+            raise ProtocolException(str(e), e)
 
         self.server_address = address
 
diff --git a/libmproxy/protocol2/ssl.py b/libmproxy/protocol2/tls.py
index a744a979..2362b2b2 100644
--- a/libmproxy/protocol2/ssl.py
+++ b/libmproxy/protocol2/tls.py
@@ -2,17 +2,17 @@ from __future__ import (absolute_import, print_function, division)
 import traceback
 from netlib import tcp
 
-from ..proxy import ProxyError2
+from ..exceptions import ProtocolException
 from .layer import Layer, yield_from_callback
 from .messages import Connect, Reconnect, ChangeServer
 from .auto import AutoLayer
 
 
-class SslLayer(Layer):
-    def __init__(self, ctx, client_ssl, server_ssl):
-        super(SslLayer, self).__init__(ctx)
-        self._client_ssl = client_ssl
-        self._server_ssl = server_ssl
+class TlsLayer(Layer):
+    def __init__(self, ctx, client_tls, server_tls):
+        super(TlsLayer, self).__init__(ctx)
+        self._client_tls = client_tls
+        self._server_tls = server_tls
         self._connected = False
         self.client_sni = None
         self._sni_from_server_change = None
@@ -41,33 +41,34 @@ class SslLayer(Layer):
               https://www.openssl.org/docs/ssl/SSL_CTX_set_cert_cb.html
             - The original mitmproxy issue is https://github.com/mitmproxy/mitmproxy/issues/427
         """
-        client_ssl_requires_server_cert = (
-            self._client_ssl and self._server_ssl and not self.config.no_upstream_cert
+        client_tls_requires_server_cert = (
+            self._client_tls and self._server_tls and not self.config.no_upstream_cert
         )
-        lazy_server_ssl = (
-            self._server_ssl and not client_ssl_requires_server_cert
+        lazy_server_tls = (
+            self._server_tls and not client_tls_requires_server_cert
         )
 
-        if client_ssl_requires_server_cert:
-            for m in self._establish_ssl_with_client_and_server():
+        if client_tls_requires_server_cert:
+            for m in self._establish_tls_with_client_and_server():
                 yield m
-        elif self.client_ssl:
-            for m in self._establish_ssl_with_client():
+        elif self._client_tls:
+            for m in self._establish_tls_with_client():
                 yield m
 
+        self.next_layer()
         layer = AutoLayer(self)
         for message in layer():
             if message != Connect or not self._connected:
                 yield message
             if message == Connect:
-                if lazy_server_ssl:
-                    self._establish_ssl_with_server()
+                if lazy_server_tls:
+                    self._establish_tls_with_server()
             if message == ChangeServer and message.depth == 1:
-                self.server_ssl = message.server_ssl
+                self._server_tls = message.server_tls
                 self._sni_from_server_change = message.sni
             if message == Reconnect or message == ChangeServer:
-                if self.server_ssl:
-                    self._establish_ssl_with_server()
+                if self._server_tls:
+                    self._establish_tls_with_server()
 
     @property
     def sni_for_upstream_connection(self):
@@ -76,7 +77,7 @@ class SslLayer(Layer):
         else:
             return self._sni_from_server_change or self.client_sni
 
-    def _establish_ssl_with_client_and_server(self):
+    def _establish_tls_with_client_and_server(self):
         """
         This function deals with the problem that the server may require a SNI value from the client.
         """
@@ -86,14 +87,14 @@ class SslLayer(Layer):
         self._connected = True
         server_err = None
         try:
-            self._establish_ssl_with_server()
-        except ProxyError2 as e:
+            self._establish_tls_with_server()
+        except ProtocolException as e:
             server_err = e
 
-        for message in self._establish_ssl_with_client():
+        for message in self._establish_tls_with_client():
             if message == Reconnect:
                 yield message
-                self._establish_ssl_with_server()
+                self._establish_tls_with_server()
             else:
                 raise RuntimeError("Unexpected Message: %s" % message)
 
@@ -102,7 +103,7 @@ class SslLayer(Layer):
 
     def handle_sni(self, connection):
         """
-        This callback gets called during the SSL handshake with the client.
+        This callback gets called during the TLS handshake with the client.
         The client has just sent the Sever Name Indication (SNI).
         """
         try:
@@ -115,7 +116,7 @@ class SslLayer(Layer):
 
             if old_upstream_sni != self.sni_for_upstream_connection:
                 # Perform reconnect
-                if self.server_ssl:
+                if self._server_tls:
                     self.yield_from_callback(Reconnect())
 
             if self.client_sni:
@@ -136,8 +137,8 @@ class SslLayer(Layer):
             self.log("Error in handle_sni:\r\n" + traceback.format_exc(), "error")
 
     @yield_from_callback
-    def _establish_ssl_with_client(self):
-        self.log("Establish SSL with client", "debug")
+    def _establish_tls_with_client(self):
+        self.log("Establish TLS with client", "debug")
         cert, key, chain_file = self.find_cert()
         try:
             self.client_conn.convert_to_ssl(
@@ -150,10 +151,10 @@ class SslLayer(Layer):
                 chain_file=chain_file
             )
         except tcp.NetLibError as e:
-            raise ProxyError2(repr(e), e)
+            raise ProtocolException(repr(e), e)
 
-    def _establish_ssl_with_server(self):
-        self.log("Establish SSL with server", "debug")
+    def _establish_tls_with_server(self):
+        self.log("Establish TLS with server", "debug")
         try:
             self.server_conn.establish_ssl(
                 self.config.clientcerts,
@@ -165,30 +166,29 @@ class SslLayer(Layer):
                 ca_pemfile=self.config.openssl_trusted_ca_server,
                 cipher_list=self.config.ciphers_server,
             )
-            ssl_cert_err = self.server_conn.ssl_verification_error
-            if ssl_cert_err is not None:
+            tls_cert_err = self.server_conn.ssl_verification_error
+            if tls_cert_err is not None:
                 self.log(
-                    "SSL verification failed for upstream server at depth %s with error: %s" %
-                    (ssl_cert_err['depth'], ssl_cert_err['errno']),
+                    "TLS verification failed for upstream server at depth %s with error: %s" %
+                    (tls_cert_err['depth'], tls_cert_err['errno']),
                     "error")
                 self.log("Ignoring server verification error, continuing with connection", "error")
         except tcp.NetLibInvalidCertificateError as e:
-            ssl_cert_err = self.server_conn.ssl_verification_error
+            tls_cert_err = self.server_conn.ssl_verification_error
             self.log(
-                "SSL verification failed for upstream server at depth %s with error: %s" %
-                (ssl_cert_err['depth'], ssl_cert_err['errno']),
+                "TLS verification failed for upstream server at depth %s with error: %s" %
+                (tls_cert_err['depth'], tls_cert_err['errno']),
                 "error")
             self.log("Aborting connection attempt", "error")
-            raise ProxyError2(repr(e), e)
+            raise ProtocolException(repr(e), e)
         except tcp.NetLibError as e:
-            raise ProxyError2(repr(e), e)
+            raise ProtocolException(repr(e), e)
 
     def find_cert(self):
         host = self.server_conn.address.host
-        # TODO: Better use an OrderedSet here
         sans = set()
         # Incorporate upstream certificate
-        if self.server_conn.ssl_established and (not self.config.no_upstream_cert):
+        if self.server_conn.tls_established and (not self.config.no_upstream_cert):
             upstream_cert = self.server_conn.cert
             sans.update(upstream_cert.altnames)
             if upstream_cert.cn:
diff --git a/libmproxy/protocol2/transparent_proxy.py b/libmproxy/protocol2/transparent_proxy.py
new file mode 100644
index 00000000..078954c2
--- /dev/null
+++ b/libmproxy/protocol2/transparent_proxy.py
@@ -0,0 +1,24 @@
+from __future__ import (absolute_import, print_function, division)
+
+from ..exceptions import ProtocolException
+from .. import platform
+from .layer import Layer, ServerConnectionMixin
+from .auto import AutoLayer
+
+
+class TransparentProxy(Layer, ServerConnectionMixin):
+
+    def __init__(self, ctx):
+        super(TransparentProxy, self).__init__(ctx)
+        self.resolver = platform.resolver()
+
+    def __call__(self):
+        try:
+            self.server_address = self.resolver.original_addr(self.client_conn.connection)
+        except Exception as e:
+            raise ProtocolException("Transparent mode failure: %s" % repr(e), e)
+
+        layer = AutoLayer(self)
+        for message in layer():
+            if not self._handle_server_message(message):
+                yield message
diff --git a/libmproxy/protocol2/upstream_proxy.py b/libmproxy/protocol2/upstream_proxy.py
new file mode 100644
index 00000000..bd920309
--- /dev/null
+++ b/libmproxy/protocol2/upstream_proxy.py
@@ -0,0 +1,18 @@
+from __future__ import (absolute_import, print_function, division)
+
+from .layer import Layer, ServerConnectionMixin
+#from .http import HttpLayer
+
+
+class UpstreamProxy(Layer, ServerConnectionMixin):
+
+    def __init__(self, ctx, server_address):
+        super(UpstreamProxy, self).__init__(ctx)
+        self.server_address = server_address
+
+    def __call__(self):
+        #layer = HttpLayer(self)
+        layer = None
+        for message in layer():
+            if not self._handle_server_message(message):
+                yield message
diff --git a/libmproxy/proxy/connection.py b/libmproxy/proxy/connection.py
index 9e03157a..49210e47 100644
--- a/libmproxy/proxy/connection.py
+++ b/libmproxy/proxy/connection.py
@@ -32,6 +32,10 @@ class ClientConnection(tcp.BaseHandler, stateobject.StateObject):
             port=self.address.port
         )
 
+    @property
+    def tls_established(self):
+        return self.ssl_established
+
     _stateobject_attributes = dict(
         ssl_established=bool,
         timestamp_start=float,
@@ -112,6 +116,10 @@ class ServerConnection(tcp.TCPClient, stateobject.StateObject):
             port=self.address.port
         )
 
+    @property
+    def tls_established(self):
+        return self.ssl_established
+
     _stateobject_attributes = dict(
         state=list,
         timestamp_start=float,
diff --git a/libmproxy/proxy/primitives.py b/libmproxy/proxy/primitives.py
index fd4eb882..a9f31181 100644
--- a/libmproxy/proxy/primitives.py
+++ b/libmproxy/proxy/primitives.py
@@ -2,12 +2,6 @@ from __future__ import absolute_import
 from netlib import socks, tcp
 
 
-class ProxyError2(Exception):
-    def __init__(self, message, cause=None):
-        super(ProxyError2, self).__init__(message)
-        self.cause = cause
-
-
 class ProxyError(Exception):
     def __init__(self, code, message, headers=None):
         super(ProxyError, self).__init__(message)
diff --git a/libmproxy/proxy/server.py b/libmproxy/proxy/server.py
index 32d596ad..c107cbed 100644
--- a/libmproxy/proxy/server.py
+++ b/libmproxy/proxy/server.py
@@ -7,7 +7,7 @@ from netlib import tcp
 
 from ..protocol.handle import protocol_handler
 from .. import protocol2
-from .primitives import ProxyServerError, Log, ProxyError, ProxyError2
+from .primitives import ProxyServerError, Log, ProxyError
 from .connection import ClientConnection, ServerConnection
 
 
@@ -79,12 +79,12 @@ class ConnectionHandler2:
             self.config,
             self.channel
         )
-        root_layer = protocol2.ReverseProxy(root_context, ("localhost", 5000), True, True)
+        root_layer = protocol2.Socks5IncomingLayer(root_context)
 
         try:
             for message in root_layer():
                 print("Root layer receveived: %s" % message)
-        except ProxyError2 as e:
+        except protocol2.ProtocolException as e:
             self.log(e, "info")
         except Exception:
             self.log(traceback.format_exc(), "error")