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"""
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
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