Add a request_client_cert argument to server SSL conversion.

By default, we now do not request the client cert. We're supposed to be able to
do this with no negative effects - if the client has no cert to present, we're
notified and proceed as usual.  Unfortunately, Android seems to have a bug
(tested on 4.2.2) - when an Android client is asked to present a certificate it
does not have, it hangs up, which is frankly bogus.  Some time down the track
we may be able to make the proper behaviour the default again, but until then
we're conservative.

1 files changed, 16 insertions, 4 deletions

diff --git a/netlib/tcp.py b/netlib/tcp.py
index b67ad0bb..47953724 100644
--- a/netlib/tcp.py
+++ b/netlib/tcp.py
@@ -240,6 +240,7 @@ class TCPClient:
 class BaseHandler:
     """
         The instantiator is expected to call the handle() and finish() methods.
+            
     """
     rbufsize = -1
     wbufsize = -1
@@ -252,9 +253,10 @@ class BaseHandler:
         self.server = server
         self.finished = False
         self.ssl_established = False
+
         self.clientcert = None
 
-    def convert_to_ssl(self, cert, key, method=SSLv23_METHOD, options=None, handle_sni=None):
+    def convert_to_ssl(self, cert, key, method=SSLv23_METHOD, options=None, handle_sni=None, request_client_cert=False):
         """
             method: One of SSLv2_METHOD, SSLv3_METHOD, SSLv23_METHOD, or TLSv1_METHOD
             handle_sni: SNI handler, should take a connection object. Server
@@ -268,6 +270,15 @@ class BaseHandler:
                             new_context.use_privatekey(key)
                             new_context.use_certificate(cert)
                             connection.set_context(new_context)
+
+            The request_client_cert argument requires some explanation. We're
+            supposed to be able to do this with no negative effects - if the
+            client has no cert to present, we're notified and proceed as usual.
+            Unfortunately, Android seems to have a bug (tested on 4.2.2) - when
+            an Android client is asked to present a certificate it does not
+            have, it hangs up, which is frankly bogus. Some time down the track
+            we may be able to make the proper behaviour the default again, but
+            until then we're conservative.
         """
         ctx = SSL.Context(method)
         if not options is None:
@@ -277,9 +288,10 @@ class BaseHandler:
             ctx.set_tlsext_servername_callback(handle_sni)
         ctx.use_privatekey_file(key)
         ctx.use_certificate_file(cert)
-        def ver(*args):
-            self.clientcert = certutils.SSLCert(args[1])
-        ctx.set_verify(SSL.VERIFY_PEER, ver)
+        if request_client_cert:
+            def ver(*args):
+                self.clientcert = certutils.SSLCert(args[1])
+            ctx.set_verify(SSL.VERIFY_PEER, ver)
         self.connection = SSL.Connection(ctx, self.connection)
         self.ssl_established = True
         self.connection.set_accept_state()