summaryrefslogtreecommitdiff
path: root/sleekxmpp/features/feature_mechanisms/mechanisms.py
diff options
context:
space:
mode:
Diffstat (limited to 'sleekxmpp/features/feature_mechanisms/mechanisms.py')
-rw-r--r--sleekxmpp/features/feature_mechanisms/mechanisms.py244
1 files changed, 0 insertions, 244 deletions
diff --git a/sleekxmpp/features/feature_mechanisms/mechanisms.py b/sleekxmpp/features/feature_mechanisms/mechanisms.py
deleted file mode 100644
index 17ad5ed0..00000000
--- a/sleekxmpp/features/feature_mechanisms/mechanisms.py
+++ /dev/null
@@ -1,244 +0,0 @@
-"""
- 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 ssl
-import logging
-
-from sleekxmpp.util import sasl
-from sleekxmpp.util.stringprep_profiles import StringPrepError
-from sleekxmpp.stanza import StreamFeatures
-from sleekxmpp.xmlstream import RestartStream, register_stanza_plugin
-from sleekxmpp.plugins import BasePlugin
-from sleekxmpp.xmlstream.matcher import MatchXPath
-from sleekxmpp.xmlstream.handler import Callback
-from sleekxmpp.features.feature_mechanisms import stanza
-
-
-log = logging.getLogger(__name__)
-
-
-class FeatureMechanisms(BasePlugin):
-
- name = 'feature_mechanisms'
- description = 'RFC 6120: Stream Feature: SASL'
- dependencies = set()
- stanza = stanza
- default_config = {
- 'use_mech': None,
- 'use_mechs': None,
- 'min_mech': None,
- 'sasl_callback': None,
- 'security_callback': None,
- 'encrypted_plain': True,
- 'unencrypted_plain': False,
- 'unencrypted_digest': False,
- 'unencrypted_cram': False,
- 'unencrypted_scram': True,
- 'order': 100
- }
-
- def plugin_init(self):
- if self.sasl_callback is None:
- self.sasl_callback = self._default_credentials
-
- if self.security_callback is None:
- self.security_callback = self._default_security
-
- creds = self.sasl_callback(set(['username']), set())
- if not self.use_mech and not creds['username']:
- self.use_mech = 'ANONYMOUS'
-
- self.mech = None
- self.mech_list = set()
- self.attempted_mechs = set()
-
- 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_stanza(stanza.Abort)
-
- self.xmpp.register_handler(
- Callback('SASL Success',
- MatchXPath(stanza.Success.tag_name()),
- self._handle_success,
- instream=True))
- self.xmpp.register_handler(
- Callback('SASL Failure',
- MatchXPath(stanza.Failure.tag_name()),
- self._handle_fail,
- instream=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.order)
-
- def _default_credentials(self, required_values, optional_values):
- creds = self.xmpp.credentials
- result = {}
- values = required_values.union(optional_values)
- for value in values:
- if value == 'username':
- result[value] = creds.get('username', self.xmpp.requested_jid.user)
- elif value == 'email':
- jid = self.xmpp.requested_jid.bare
- result[value] = creds.get('email', jid)
- elif value == 'channel_binding':
- if hasattr(self.xmpp.socket, 'get_channel_binding'):
- result[value] = self.xmpp.socket.get_channel_binding()
- else:
- log.debug("Channel binding not supported.")
- log.debug("Use Python 3.3+ for channel binding and " + \
- "SCRAM-SHA-1-PLUS support")
- result[value] = None
- elif value == 'host':
- result[value] = creds.get('host', self.xmpp.requested_jid.domain)
- elif value == 'realm':
- result[value] = creds.get('realm', self.xmpp.requested_jid.domain)
- elif value == 'service-name':
- result[value] = creds.get('service-name', self.xmpp._service_name)
- elif value == 'service':
- result[value] = creds.get('service', 'xmpp')
- elif value in creds:
- result[value] = creds[value]
- return result
-
- def _default_security(self, values):
- result = {}
- for value in values:
- if value == 'encrypted':
- if 'starttls' in self.xmpp.features:
- result[value] = True
- elif isinstance(self.xmpp.socket, ssl.SSLSocket):
- result[value] = True
- else:
- result[value] = False
- else:
- result[value] = self.config.get(value, False)
- return result
-
- 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
-
- enforce_limit = False
- limited_mechs = self.use_mechs
-
- if limited_mechs is None:
- limited_mechs = set()
- elif limited_mechs and not isinstance(limited_mechs, set):
- limited_mechs = set(limited_mechs)
- enforce_limit = True
-
- if self.use_mech:
- limited_mechs.add(self.use_mech)
- enforce_limit = True
-
- if enforce_limit:
- self.use_mechs = limited_mechs
-
- self.mech_list = set(features['mechanisms'])
-
- return self._send_auth()
-
- def _send_auth(self):
- mech_list = self.mech_list - self.attempted_mechs
- try:
- self.mech = sasl.choose(mech_list,
- self.sasl_callback,
- self.security_callback,
- limit=self.use_mechs,
- min_mech=self.min_mech)
- except sasl.SASLNoAppropriateMechanism:
- log.error("No appropriate login method.")
- self.xmpp.event("no_auth", direct=True)
- self.xmpp.event("failed_auth", direct=True)
- self.attempted_mechs = set()
- return self.xmpp.disconnect()
- except StringPrepError:
- log.exception("A credential value did not pass SASLprep.")
- self.xmpp.disconnect()
-
- resp = stanza.Auth(self.xmpp)
- resp['mechanism'] = self.mech.name
- try:
- resp['value'] = self.mech.process()
- except sasl.SASLCancelled:
- self.attempted_mechs.add(self.mech.name)
- self._send_auth()
- except sasl.SASLFailed:
- self.attempted_mechs.add(self.mech.name)
- self._send_auth()
- except sasl.SASLMutualAuthFailed:
- log.error("Mutual authentication failed! " + \
- "A security breach is possible.")
- self.attempted_mechs.add(self.mech.name)
- self.xmpp.disconnect()
- else:
- resp.send(now=True)
-
- return True
-
- def _handle_challenge(self, stanza):
- """SASL challenge received. Process and send response."""
- resp = self.stanza.Response(self.xmpp)
- try:
- resp['value'] = self.mech.process(stanza['value'])
- except sasl.SASLCancelled:
- self.stanza.Abort(self.xmpp).send()
- except sasl.SASLFailed:
- self.stanza.Abort(self.xmpp).send()
- except sasl.SASLMutualAuthFailed:
- log.error("Mutual authentication failed! " + \
- "A security breach is possible.")
- self.attempted_mechs.add(self.mech.name)
- self.xmpp.disconnect()
- else:
- if resp.get_value() == '':
- resp.del_value()
- resp.send(now=True)
-
- def _handle_success(self, stanza):
- """SASL authentication succeeded. Restart the stream."""
- try:
- final = self.mech.process(stanza['value'])
- except sasl.SASLMutualAuthFailed:
- log.error("Mutual authentication failed! " + \
- "A security breach is possible.")
- self.attempted_mechs.add(self.mech.name)
- self.xmpp.disconnect()
- else:
- self.attempted_mechs = set()
- self.xmpp.authenticated = True
- self.xmpp.features.add('mechanisms')
- self.xmpp.event('auth_success', stanza, direct=True)
- raise RestartStream()
-
- def _handle_fail(self, stanza):
- """SASL authentication failed. Disconnect and shutdown."""
- self.attempted_mechs.add(self.mech.name)
- log.info("Authentication failed: %s", stanza['condition'])
- self.xmpp.event("failed_auth", stanza, direct=True)
- self._send_auth()
- return True