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|
## auth_nb.py
## based on auth.py
##
## Copyright (C) 2003-2005 Alexey "Snake" Nezhdanov
## modified by Dimitur Kirov <dkirov@gmail.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## 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 General Public License for more details.
'''
Provides library with all Non-SASL and SASL authentication mechanisms.
Can be used both for client and transport authentication.
'''
import sys
from protocol import *
from auth import *
from client import PlugIn
import sha,base64,random,dispatcher_nb
try:
import kerberos
have_kerberos = True
except ImportError:
have_kerberos = False
GSS_STATE_STEP = 0
GSS_STATE_WRAP = 1
def challenge_splitter(data):
''' Helper function that creates a dict from challenge string.
Sample chalenge string:
username="example.org",realm="somerealm",\
nonce="OA6MG9tEQGm2hh",cnonce="OA6MHXh6VqTrRk",\
nc=00000001,qop="auth,auth-int,auth-conf",charset=utf-8
in the above example:
dict['qop'] = ('auth','auth-int','auth-conf')
dict['realm'] = 'somerealm'
'''
X_KEYWORD, X_VALUE, X_END = 0, 1, 2
quotes_open = False
keyword, value = '', ''
dict, arr = {}, None
expecting = X_KEYWORD
for iter in range(len(data) + 1):
end = False
if iter == len(data):
expecting = X_END
end = True
else:
char = data[iter]
if expecting == X_KEYWORD:
if char == '=':
expecting = X_VALUE
elif char in (',', ' ', '\t'):
pass
else:
keyword = '%s%c' % (keyword, char)
elif expecting == X_VALUE:
if char == '"':
if quotes_open:
end = True
else:
quotes_open = True
elif char in (',', ' ', '\t'):
if quotes_open:
if not arr:
arr = [value]
else:
arr.append(value)
value = ""
else:
end = True
else:
value = '%s%c' % (value, char)
if end:
if arr:
arr.append(value)
dict[keyword] = arr
arr = None
else:
dict[keyword] = value
value, keyword = '', ''
expecting = X_KEYWORD
quotes_open = False
return dict
class SASL(PlugIn):
''' Implements SASL authentication. '''
def __init__(self,username,password, on_sasl):
PlugIn.__init__(self)
self.username=username
self.password=password
self.on_sasl = on_sasl
self.realm = None
def plugin(self,owner):
if 'version' not in self._owner.Dispatcher.Stream._document_attrs:
self.startsasl='not-supported'
elif self._owner.Dispatcher.Stream.features:
try:
self.FeaturesHandler(self._owner.Dispatcher, self._owner.Dispatcher.Stream.features)
except NodeProcessed:
pass
else: self.startsasl=None
def auth(self):
''' Start authentication. Result can be obtained via "SASL.startsasl" attribute and will be
either "success" or "failure". Note that successfull auth will take at least
two Dispatcher.Process() calls. '''
if self.startsasl:
pass
elif self._owner.Dispatcher.Stream.features:
try:
self.FeaturesHandler(self._owner.Dispatcher, self._owner.Dispatcher.Stream.features)
except NodeProcessed:
pass
else: self._owner.RegisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
def plugout(self):
''' Remove SASL handlers from owner's dispatcher. Used internally. '''
self._owner.UnregisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
self._owner.UnregisterHandler('challenge', self.SASLHandler, xmlns=NS_SASL)
self._owner.UnregisterHandler('failure', self.SASLHandler, xmlns=NS_SASL)
self._owner.UnregisterHandler('success', self.SASLHandler, xmlns=NS_SASL)
def FeaturesHandler(self, conn, feats):
''' Used to determine if server supports SASL auth. Used internally. '''
if not feats.getTag('mechanisms', namespace=NS_SASL):
self.startsasl='not-supported'
self.DEBUG('SASL not supported by server', 'error')
return
mecs=[]
for mec in feats.getTag('mechanisms', namespace=NS_SASL).getTags('mechanism'):
mecs.append(mec.getData())
self._owner.RegisterHandler('challenge', self.SASLHandler, xmlns=NS_SASL)
self._owner.RegisterHandler('failure', self.SASLHandler, xmlns=NS_SASL)
self._owner.RegisterHandler('success', self.SASLHandler, xmlns=NS_SASL)
if "GSSAPI" in mecs and have_kerberos:
rc, self.gss_vc = kerberos.authGSSClientInit('xmpp@' +
self._owner.Server)
response = kerberos.authGSSClientResponse(self.gss_vc)
node=Node('auth',attrs={'xmlns': NS_SASL, 'mechanism': 'GSSAPI'},
payload=(response or ""))
self.mechanism = "GSSAPI"
self.gss_step = GSS_STATE_STEP
elif "DIGEST-MD5" in mecs:
node=Node('auth',attrs={'xmlns': NS_SASL, 'mechanism': 'DIGEST-MD5'})
self.mechanism = "DIGEST-MD5"
elif "PLAIN" in mecs:
sasl_data='%s\x00%s\x00%s' % (self.username+'@' + self._owner.Server,
self.username, self.password)
node=Node('auth', attrs={'xmlns':NS_SASL,'mechanism':'PLAIN'},
payload=[base64.encodestring(sasl_data).replace('\n','')])
self.mechanism = "PLAIN"
else:
self.startsasl='failure'
self.DEBUG('I can only use DIGEST-MD5, GSSAPI and PLAIN mecanisms.', 'error')
return
self.startsasl='in-process'
self._owner.send(node.__str__())
raise NodeProcessed
def SASLHandler(self, conn, challenge):
''' Perform next SASL auth step. Used internally. '''
if challenge.getNamespace() <> NS_SASL:
return
if challenge.getName() == 'failure':
self.startsasl = 'failure'
try:
reason = challenge.getChildren()[0]
except:
reason = challenge
self.DEBUG('Failed SASL authentification: %s' % reason, 'error')
if self.on_sasl :
self.on_sasl ()
raise NodeProcessed
elif challenge.getName() == 'success':
self.startsasl='success'
self.DEBUG('Successfully authenticated with remote server.', 'ok')
handlers=self._owner.Dispatcher.dumpHandlers()
self._owner.Dispatcher.PlugOut()
dispatcher_nb.Dispatcher().PlugIn(self._owner)
self._owner.Dispatcher.restoreHandlers(handlers)
self._owner.User = self.username
if self.on_sasl :
self.on_sasl ()
raise NodeProcessed
########################################3333
incoming_data = challenge.getData()
data=base64.decodestring(incoming_data)
self.DEBUG('Got challenge:'+data,'ok')
if self.mechanism == "GSSAPI":
if self.gss_step == GSS_STATE_STEP:
rc = kerberos.authGSSClientStep(self.gss_vc, incoming_data)
if rc != kerberos.AUTH_GSS_CONTINUE:
self.gss_step = GSS_STATE_WRAP
elif self.gss_step == GSS_STATE_WRAP:
rc = kerberos.authGSSClientUnwrap(self.gss_vc, incoming_data)
response = kerberos.authGSSClientResponse(self.gss_vc)
rc = kerberos.authGSSClientWrap(self.gss_vc, response,
self.username)
response = kerberos.authGSSClientResponse(self.gss_vc)
if not response:
response = ''
self._owner.send(Node('response', attrs={'xmlns':NS_SASL},
payload=response).__str__())
raise NodeProcessed
chal = challenge_splitter(data)
if not self.realm and 'realm' in chal:
self.realm = chal['realm']
if 'qop' in chal and ((type(chal['qop']) == str and \
chal['qop'] =='auth') or (type(chal['qop']) == list and 'auth' in \
chal['qop'])):
resp={}
resp['username'] = self.username
if self.realm:
resp['realm'] = self.realm
else:
resp['realm'] = self._owner.Server
resp['nonce']=chal['nonce']
cnonce=''
for i in range(7):
cnonce += hex(int(random.random() * 65536 * 4096))[2:]
resp['cnonce'] = cnonce
resp['nc'] = ('00000001')
resp['qop'] = 'auth'
resp['digest-uri'] = 'xmpp/'+self._owner.Server
A1=C([H(C([resp['username'], resp['realm'], self.password])),
resp['nonce'], resp['cnonce']])
A2=C(['AUTHENTICATE',resp['digest-uri']])
response= HH(C([HH(A1), resp['nonce'], resp['nc'], resp['cnonce'],
resp['qop'], HH(A2)]))
resp['response'] = response
resp['charset'] = 'utf-8'
sasl_data=''
for key in ['charset', 'username', 'realm', 'nonce', 'nc', 'cnonce', 'digest-uri', 'response', 'qop']:
if key in ['nc','qop','response','charset']:
sasl_data += "%s=%s," % (key,resp[key])
else:
sasl_data += '%s="%s",' % (key,resp[key])
########################################3333
node=Node('response', attrs={'xmlns':NS_SASL},
payload=[base64.encodestring(sasl_data[:-1]).replace('\r','').replace('\n','')])
self._owner.send(node.__str__())
elif 'rspauth' in chal:
self._owner.send(Node('response', attrs={'xmlns':NS_SASL}).__str__())
else:
self.startsasl='failure'
self.DEBUG('Failed SASL authentification: unknown challenge', 'error')
if self.on_sasl :
self.on_sasl ()
raise NodeProcessed
class NonBlockingNonSASL(PlugIn):
''' Implements old Non-SASL (JEP-0078) authentication used
in jabberd1.4 and transport authentication.
'''
def __init__(self, user, password, resource, on_auth):
''' Caches username, password and resource for auth. '''
PlugIn.__init__(self)
self.DBG_LINE ='gen_auth'
self.user = user
self.password= password
self.resource = resource
self.on_auth = on_auth
def plugin(self, owner):
''' Determine the best auth method (digest/0k/plain) and use it for auth.
Returns used method name on success. Used internally. '''
if not self.resource:
return self.authComponent(owner)
self.DEBUG('Querying server about possible auth methods', 'start')
self.owner = owner
resp = owner.Dispatcher.SendAndWaitForResponse(
Iq('get', NS_AUTH, payload=[Node('username', payload=[self.user])]), func=self._on_username
)
def _on_username(self, resp):
if not isResultNode(resp):
self.DEBUG('No result node arrived! Aborting...','error')
return self.on_auth(None)
iq=Iq(typ='set',node=resp)
query=iq.getTag('query')
query.setTagData('username',self.user)
query.setTagData('resource',self.resource)
if query.getTag('digest'):
self.DEBUG("Performing digest authentication",'ok')
query.setTagData('digest',
sha.new(self.owner.Dispatcher.Stream._document_attrs['id']+self.password).hexdigest())
if query.getTag('password'):
query.delChild('password')
self._method='digest'
elif query.getTag('token'):
token=query.getTagData('token')
seq=query.getTagData('sequence')
self.DEBUG("Performing zero-k authentication",'ok')
hash = sha.new(sha.new(self.password).hexdigest()+token).hexdigest()
for foo in xrange(int(seq)):
hash = sha.new(hash).hexdigest()
query.setTagData('hash',hash)
self._method='0k'
else:
self.DEBUG("Sequre methods unsupported, performing plain text authentication",'warn')
query.setTagData('password',self.password)
self._method='plain'
resp=self.owner.Dispatcher.SendAndWaitForResponse(iq, func=self._on_auth)
def _on_auth(self, resp):
if isResultNode(resp):
self.DEBUG('Sucessfully authenticated with remove host.','ok')
self.owner.User=self.user
self.owner.Resource=self.resource
self.owner._registered_name=self.owner.User+'@'+self.owner.Server+'/'+self.owner.Resource
return self.on_auth(self._method)
self.DEBUG('Authentication failed!','error')
return self.on_auth(None)
def authComponent(self,owner):
''' Authenticate component. Send handshake stanza and wait for result. Returns "ok" on success. '''
self.handshake=0
owner.send(Node(NS_COMPONENT_ACCEPT+' handshake',
payload=[sha.new(owner.Dispatcher.Stream._document_attrs['id']+self.password).hexdigest()]))
owner.RegisterHandler('handshake', self.handshakeHandler, xmlns=NS_COMPONENT_ACCEPT)
self._owner.onreceive(self._on_auth_component)
def _on_auth_component(self, data):
''' called when we receive some response, after we send the handshake '''
if data:
self.Dispatcher.ProcessNonBlocking(data)
if not self.handshake:
self.DEBUG('waiting on handshake', 'notify')
return
self._owner.onreceive(None)
owner._registered_name=self.user
if self.handshake+1:
return self.on_auth('ok')
self.on_auth(None)
def handshakeHandler(self,disp,stanza):
''' Handler for registering in dispatcher for accepting transport authentication. '''
if stanza.getName() == 'handshake':
self.handshake=1
else:
self.handshake=-1
class NonBlockingBind(Bind):
''' Bind some JID to the current connection to allow router know of our location.'''
def plugin(self, owner):
''' Start resource binding, if allowed at this time. Used internally. '''
if self._owner.Dispatcher.Stream.features:
try:
self.FeaturesHandler(self._owner.Dispatcher, self._owner.Dispatcher.Stream.features)
except NodeProcessed:
pass
else: self._owner.RegisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
def plugout(self):
''' Remove Bind handler from owner's dispatcher. Used internally. '''
self._owner.UnregisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
def NonBlockingBind(self, resource=None, on_bound=None):
''' Perform binding. Use provided resource name or random (if not provided). '''
self.on_bound = on_bound
self._resource = resource
if self._resource:
self._resource = [Node('resource', payload=[self._resource])]
else:
self._resource = []
self._owner.onreceive(None)
resp=self._owner.Dispatcher.SendAndWaitForResponse(
Protocol('iq',typ='set',
payload=[Node('bind', attrs={'xmlns':NS_BIND}, payload=self._resource)]),
func=self._on_bound)
def _on_bound(self, resp):
if isResultNode(resp):
self.bound.append(resp.getTag('bind').getTagData('jid'))
self.DEBUG('Successfully bound %s.'%self.bound[-1],'ok')
jid=JID(resp.getTag('bind').getTagData('jid'))
self._owner.User=jid.getNode()
self._owner.Resource=jid.getResource()
self._owner.SendAndWaitForResponse(Protocol('iq', typ='set',
payload=[Node('session', attrs={'xmlns':NS_SESSION})]), func=self._on_session)
elif resp:
self.DEBUG('Binding failed: %s.' % resp.getTag('error'),'error')
self.on_bound(None)
else:
self.DEBUG('Binding failed: timeout expired.', 'error')
self.on_bound(None)
def _on_session(self, resp):
self._owner.onreceive(None)
if isResultNode(resp):
self.DEBUG('Successfully opened session.', 'ok')
self.session = 1
self.on_bound('ok')
else:
self.DEBUG('Session open failed.', 'error')
self.session = 0
self.on_bound(None)
self._owner.onreceive(None)
if isResultNode(resp):
self.DEBUG('Successfully opened session.', 'ok')
self.session = 1
self.on_bound('ok')
else:
self.DEBUG('Session open failed.', 'error')
self.session = 0
self.on_bound(None)
class NBComponentBind(ComponentBind):
''' ComponentBind some JID to the current connection to allow
router know of our location.
'''
def plugin(self,owner):
''' Start resource binding, if allowed at this time. Used internally. '''
if self._owner.Dispatcher.Stream.features:
try:
self.FeaturesHandler(self._owner.Dispatcher, self._owner.Dispatcher.Stream.features)
except NodeProcessed:
pass
else:
self._owner.RegisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
self.needsUnregister = 1
def plugout(self):
''' Remove ComponentBind handler from owner's dispatcher. Used internally. '''
if self.needsUnregister:
self._owner.UnregisterHandler('features', self.FeaturesHandler, xmlns=NS_STREAMS)
def Bind(self, domain = None, on_bind = None):
''' Perform binding. Use provided domain name (if not provided). '''
self._owner.onreceive(self._on_bound)
self.on_bind = on_bind
def _on_bound(self, resp):
if data:
self.Dispatcher.ProcessNonBlocking(data)
if self.bound is None:
return
self._owner.onreceive(None)
self._owner.SendAndWaitForResponse(
Protocol('bind', attrs={'name':domain}, xmlns=NS_COMPONENT_1),
func=self._on_bind_reponse)
def _on_bind_reponse(self, res):
if resp and resp.getAttr('error'):
self.DEBUG('Binding failed: %s.' % resp.getAttr('error'), 'error')
elif resp:
self.DEBUG('Successfully bound.', 'ok')
if self.on_bind:
self.on_bind('ok')
else:
self.DEBUG('Binding failed: timeout expired.', 'error')
if self.on_bind:
self.on_bind(None)
# vim: se ts=3:
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