Handle TLS handshake timeouts in SSLSocketConnection

SSLSocketConnection prior to this commit would hang identifitly if a
timeout during the TLS handshake occurs. This can happen if a target
accepts a TCP connection but does not send any TLS handshake messages,
e.g. because of a bug triggered by the fuzzing.

This commit makes boofuzz observe timeouts during the TLS handshake. TLS
handshake timeouts are handled in the same way as timeouts during TCP
connection setup.

boofuzz/connections/ssl_socket_connection.py

@@ -54,7 +54,21 @@ def open(self):
             # No SSL context set
             pass
 
-        super(SSLSocketConnection, self)._connect_socket()
+        # The wrapped SSL Socket does not have the timeout that is confiugred
+        # in BaseSocketConnection but needs the timeout to be configured 
+        # through the SSLSocket class
+        self._sock.settimeout(self._recv_timeout)
+
+        try:
+            super(SSLSocketConnection, self)._connect_socket()
+        except TimeoutError as e:
+            # This TimeoutError is raised by the SSL layer during the TLS 
+            # handshake, e.g. when the TCP connection could be established
+            # but the TLS handshakes times out. All other errors are handled
+            # by the parent class
+            raise exception.BoofuzzTargetConnectionFailedError(str(e))
+        else:
+            raise
 
     def recv(self, max_bytes):
         """