/usr/share/pyshared/pyxmpp/sasl/gssapi.py is in python-pyxmpp 1.1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | #
# (C) Copyright 2008 Jelmer Vernooij <jelmer@samba.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License Version
# 2.1 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
"""GSSAPI authentication mechanism for PyXMPP SASL implementation.
Normative reference:
- `RFC 4752 <http://www.ietf.org/rfc/rfc4752.txt>`__
"""
__docformat__="restructuredtext en"
import base64
import kerberos
import logging
from pyxmpp.sasl.core import (ClientAuthenticator,Failure,Response,Challenge,Success)
class GSSAPIClientAuthenticator(ClientAuthenticator):
"""Provides client-side GSSAPI SASL (Kerberos 5) authentication."""
def __init__(self,password_manager):
ClientAuthenticator.__init__(self, password_manager)
self.password_manager = password_manager
self.__logger = logging.getLogger("pyxmpp.sasl.gssapi.GSSAPIClientAuthenticator")
def start(self, username, authzid):
self.username = username
self.authzid = authzid
rc, self._gss = kerberos.authGSSClientInit(authzid or "%s@%s" % ("xmpp", self.password_manager.get_serv_host()))
self.step = 0
return self.challenge("")
def challenge(self, challenge):
if self.step == 0:
rc = kerberos.authGSSClientStep(self._gss, base64.b64encode(challenge))
if rc != kerberos.AUTH_GSS_CONTINUE:
self.step = 1
elif self.step == 1:
rc = kerberos.authGSSClientUnwrap(self._gss, base64.b64encode(challenge))
response = kerberos.authGSSClientResponse(self._gss)
rc = kerberos.authGSSClientWrap(self._gss, response, self.username)
response = kerberos.authGSSClientResponse(self._gss)
if response is None:
return Response("")
else:
return Response(base64.b64decode(response))
def finish(self, data):
self.username = kerberos.authGSSClientUserName(self._gss)
self.__logger.debug("Authenticated as %s" % kerberos.authGSSClientUserName(self._gss))
return Success(self.username,None,self.authzid)
# vi: sts=4 et sw=4
|