/usr/share/pyshared/pyxmpp/sasl/plain.py is in python-pyxmpp 1.1.2-1.
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# (C) Copyright 2003-2010 Jacek Konieczny <jajcus@jajcus.net>
#
# 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.
#
"""PLAIN authentication mechanism for PyXMPP SASL implementation.
Normative reference:
- `RFC 2595 <http://www.ietf.org/rfc/rfc2595.txt>`__
"""
__docformat__="restructuredtext en"
import logging
from pyxmpp.utils import to_utf8,from_utf8
from pyxmpp.sasl.core import ClientAuthenticator,ServerAuthenticator
from pyxmpp.sasl.core import Success,Failure,Challenge,Response
class PlainClientAuthenticator(ClientAuthenticator):
"""Provides PLAIN SASL authentication for a client."""
def __init__(self,password_manager):
"""Initialize a `PlainClientAuthenticator` object.
:Parameters:
- `password_manager`: name of the password manager object providing
authentication credentials.
:Types:
- `password_manager`: `PasswordManager`"""
ClientAuthenticator.__init__(self,password_manager)
self.username=None
self.finished=None
self.password=None
self.authzid=None
self.__logger=logging.getLogger("pyxmpp.sasl.PlainClientAuthenticator")
def start(self,username,authzid):
"""Start the authentication process and return the initial response.
:Parameters:
- `username`: username (authentication id).
- `authzid`: authorization id.
:Types:
- `username`: `unicode`
- `authzid`: `unicode`
:return: the initial response or a failure indicator.
:returntype: `sasl.Response` or `sasl.Failure`"""
self.username=username
if authzid:
self.authzid=authzid
else:
self.authzid=""
self.finished=0
return self.challenge("")
def challenge(self, challenge):
"""Process the challenge and return the response.
:Parameters:
- `challenge`: the challenge.
:Types:
- `challenge`: `str`
:return: the response or a failure indicator.
:returntype: `sasl.Response` or `sasl.Failure`"""
_unused = challenge
if self.finished:
self.__logger.debug("Already authenticated")
return Failure("extra-challenge")
self.finished=1
if self.password is None:
self.password,pformat=self.password_manager.get_password(self.username)
if not self.password or pformat!="plain":
self.__logger.debug("Couldn't retrieve plain password")
return Failure("password-unavailable")
return Response("%s\000%s\000%s" % ( to_utf8(self.authzid),
to_utf8(self.username),
to_utf8(self.password)))
def finish(self,data):
"""Handle authentication succes information from the server.
:Parameters:
- `data`: the optional additional data returned with the success.
:Types:
- `data`: `str`
:return: a success indicator.
:returntype: `Success`"""
_unused = data
return Success(self.username,None,self.authzid)
class PlainServerAuthenticator(ServerAuthenticator):
"""Provides PLAIN SASL authentication for a server."""
def __init__(self,password_manager):
"""Initialize a `PlainServerAuthenticator` object.
:Parameters:
- `password_manager`: name of the password manager object providing
authentication credential verification.
:Types:
- `password_manager`: `PasswordManager`"""
ServerAuthenticator.__init__(self,password_manager)
self.__logger=logging.getLogger("pyxmpp.sasl.PlainServerAuthenticator")
def start(self,response):
"""Start the authentication process.
:Parameters:
- `response`: the initial response from the client.
:Types:
- `response`: `str`
:return: a challenge, a success indicator or a failure indicator.
:returntype: `sasl.Challenge`, `sasl.Success` or `sasl.Failure`"""
if not response:
return Challenge("")
return self.response(response)
def response(self,response):
"""Process a client reponse.
:Parameters:
- `response`: the response from the client.
:Types:
- `response`: `str`
:return: a challenge, a success indicator or a failure indicator.
:returntype: `sasl.Challenge`, `sasl.Success` or `sasl.Failure`"""
s=response.split("\000")
if len(s)!=3:
self.__logger.debug("Bad response: %r" % (response,))
return Failure("not-authorized")
authzid,username,password=s
authzid=from_utf8(authzid)
username=from_utf8(username)
password=from_utf8(password)
if not self.password_manager.check_password(username,password):
self.__logger.debug("Bad password. Response was: %r" % (response,))
return Failure("not-authorized")
info={"mechanism":"PLAIN","username":username}
if self.password_manager.check_authzid(authzid,info):
return Success(username,None,authzid)
else:
self.__logger.debug("Authzid verification failed.")
return Failure("invalid-authzid")
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