From 41419a21613bd17f58965840340251872603a2e4 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Mon, 21 Jan 2019 01:01:59 +0100
Subject: [PATCH] Fix authenticating on a non-TLS socket.

This was broken since c1562b76b273cc7aeaaa1cf8fddd3dca2c828c4d.
---
 slixmpp/features/feature_mechanisms/mechanisms.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/slixmpp/features/feature_mechanisms/mechanisms.py b/slixmpp/features/feature_mechanisms/mechanisms.py
index 30449de0..26af1947 100644
--- a/slixmpp/features/feature_mechanisms/mechanisms.py
+++ b/slixmpp/features/feature_mechanisms/mechanisms.py
@@ -97,7 +97,10 @@ class FeatureMechanisms(BasePlugin):
                 jid = self.xmpp.requested_jid.bare
                 result[value] = creds.get('email', jid)
             elif value == 'channel_binding':
-                result[value] = self.xmpp.socket.get_channel_binding()
+                if isinstance(self.xmpp.socket, (ssl.SSLSocket, ssl.SSLObject)):
+                    result[value] = self.xmpp.socket.get_channel_binding()
+                else:
+                    result[value] = None
             elif value == 'host':
                 result[value] = creds.get('host', self.xmpp.requested_jid.domain)
             elif value == 'realm':