1 files changed, 127 insertions, 0 deletions
diff --git a/sleekxmpp/features/feature_mechanisms/mechanisms.py b/sleekxmpp/features/feature_mechanisms/mechanisms.py
new file mode 100644
index 00000000..d60818bb
--- /dev/null
+++ b/sleekxmpp/features/feature_mechanisms/mechanisms.py
@@ -0,0 +1,127 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2011  Nathanael C. Fritz
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+from sleekxmpp.thirdparty import suelta
+
+from sleekxmpp.stanza import StreamFeatures
+from sleekxmpp.xmlstream import RestartStream, register_stanza_plugin
+from sleekxmpp.xmlstream.matcher import *
+from sleekxmpp.xmlstream.handler import *
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.features.feature_mechanisms import stanza
+
+
+log = logging.getLogger(__name__)
+
+
+class feature_mechanisms(base_plugin):
+
+    def plugin_init(self):
+        self.name = 'SASL Mechanisms'
+        self.rfc = '6120'
+        self.description = "SASL Stream Feature"
+        self.stanza = stanza
+
+
+        def tls_active():
+            return 'starttls' in self.xmpp.features
+
+        def basic_callback(mech, values):
+            if 'username' in values:
+                values['username'] = self.xmpp.boundjid.user
+            if 'password' in values:
+                values['password'] = self.xmpp.password
+            mech.fulfill(values)
+
+        sasl_callback = self.config.get('sasl_callback', None)
+        if sasl_callback is None:
+            sasl_callback = basic_callback
+
+        self.mech = None
+        self.sasl = suelta.SASL(self.xmpp.boundjid.domain, 'xmpp',
+                                username=self.xmpp.boundjid.user,
+                                sec_query=suelta.sec_query_allow,
+                                request_values=sasl_callback,
+                                tls_active=tls_active)
+
+        register_stanza_plugin(StreamFeatures, stanza.Mechanisms)
+
+        self.xmpp.register_stanza(stanza.Success)
+        self.xmpp.register_stanza(stanza.Failure)
+        self.xmpp.register_stanza(stanza.Auth)
+        self.xmpp.register_stanza(stanza.Challenge)
+        self.xmpp.register_stanza(stanza.Response)
+
+        self.xmpp.register_handler(
+                Callback('SASL Success',
+                         MatchXPath(stanza.Success.tag_name()),
+                         self._handle_success,
+                         instream=True,
+                         once=True))
+        self.xmpp.register_handler(
+                Callback('SASL Failure',
+                         MatchXPath(stanza.Failure.tag_name()),
+                         self._handle_fail,
+                         instream=True,
+                         once=True))
+        self.xmpp.register_handler(
+                Callback('SASL Challenge',
+                         MatchXPath(stanza.Challenge.tag_name()),
+                         self._handle_challenge))
+
+        self.xmpp.register_feature('mechanisms',
+                self._handle_sasl_auth,
+                restart=True,
+                order=self.config.get('order', 100))
+
+    def _handle_sasl_auth(self, features):
+        """
+        Handle authenticating using SASL.
+
+        Arguments:
+            features -- The stream features stanza.
+        """
+        if 'mechanisms' in self.xmpp.features:
+            # SASL authentication has already succeeded, but the
+            # server has incorrectly offered it again.
+            return False
+
+        mech_list = features['mechanisms']
+        self.mech = self.sasl.choose_mechanism(mech_list)
+
+        if self.mech is not None:
+            resp = stanza.Auth(self.xmpp)
+            resp['mechanism'] = self.mech.name
+            resp['value'] = self.mech.process()
+            resp.send(now=True)
+        else:
+            log.error("No appropriate login method.")
+            self.xmpp.event("no_auth", direct=True)
+            self.xmpp.disconnect()
+        return True
+
+    def _handle_challenge(self, stanza):
+        """SASL challenge received. Process and send response."""
+        resp = self.stanza.Response(self.xmpp)
+        resp['value'] = self.mech.process(stanza['value'])
+        resp.send(now=True)
+
+    def _handle_success(self, stanza):
+        """SASL authentication succeeded. Restart the stream."""
+        self.xmpp.authenticated = True
+        self.xmpp.features.add('mechanisms')
+        raise RestartStream()
+
+    def _handle_fail(self, stanza):
+        """SASL authentication failed. Disconnect and shutdown."""
+        log.info("Authentication failed: %s" % stanza['condition'])
+        self.xmpp.event("failed_auth", stanza, direct=True)
+        self.xmpp.disconnect()
+        return True