This file is indexed.

/usr/share/pyshared/xmpp/auth.py is in python-xmpp 0.4.1-cvs20080505.2ubuntu1.

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
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
##   auth.py
##
##   Copyright (C) 2003-2005 Alexey "Snake" Nezhdanov
##
##   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.

# $Id: auth.py,v 1.39 2008/02/08 09:00:55 normanr Exp $

"""
Provides library with all Non-SASL and SASL authentication mechanisms.
Can be used both for client and transport authentication.
"""

from protocol import *
from client import PlugIn
import sha,base64,random,dispatcher,re

import md5
def HH(some): return md5.new(some).hexdigest()
def H(some): return md5.new(some).digest()
def C(some): return ':'.join(some)

class NonSASL(PlugIn):
    """ Implements old Non-SASL (JEP-0078) authentication used in jabberd1.4 and transport authentication."""
    def __init__(self,user,password,resource):
        """ Caches username, password and resource for auth. """
        PlugIn.__init__(self)
        self.DBG_LINE='gen_auth'
        self.user=user
        self.password=password
        self.resource=resource

    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')
        resp=owner.Dispatcher.SendAndWaitForResponse(Iq('get',NS_AUTH,payload=[Node('username',payload=[self.user])]))
        if not isResultNode(resp):
            self.DEBUG('No result node arrived! Aborting...','error')
            return
        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(owner.Dispatcher.Stream._document_attrs['id']+self.password).hexdigest())
            if query.getTag('password'): query.delChild('password')
            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)
            method='0k'
        else:
            self.DEBUG("Sequre methods unsupported, performing plain text authentication",'warn')
            query.setTagData('password',self.password)
            method='plain'
        resp=owner.Dispatcher.SendAndWaitForResponse(iq)
        if isResultNode(resp):
            self.DEBUG('Sucessfully authenticated with remove host.','ok')
            owner.User=self.user
            owner.Resource=self.resource
            owner._registered_name=owner.User+'@'+owner.Server+'/'+owner.Resource
            return method
        self.DEBUG('Authentication failed!','error')

    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)
        while not self.handshake:
            self.DEBUG("waiting on handshake",'notify')
            owner.Process(1)
        owner._registered_name=self.user
        if self.handshake+1: return 'ok'

    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 SASL(PlugIn):
    """ Implements SASL authentication. """
    def __init__(self,username,password):
        PlugIn.__init__(self)
        self.username=username
        self.password=password

    def plugin(self,owner):
        if not self._owner.Dispatcher.Stream._document_attrs.has_key('version'): 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. """
        if self._owner.__dict__.has_key('features'): self._owner.UnregisterHandler('features',self.FeaturesHandler,xmlns=NS_STREAMS)
        if self._owner.__dict__.has_key('challenge'): self._owner.UnregisterHandler('challenge',self.SASLHandler,xmlns=NS_SASL)
        if self._owner.__dict__.has_key('failure'): self._owner.UnregisterHandler('failure',self.SASLHandler,xmlns=NS_SASL)
        if self._owner.__dict__.has_key('success'): 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 "DIGEST-MD5" in mecs:
            node=Node('auth',attrs={'xmlns':NS_SASL,'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)])
        else:
            self.startsasl='failure'
            self.DEBUG('I can only use DIGEST-MD5 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')
            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.Dispatcher().PlugIn(self._owner)
            self._owner.Dispatcher.restoreHandlers(handlers)
            self._owner.User=self.username
            raise NodeProcessed
########################################3333
        incoming_data=challenge.getData()
        chal={}
        data=base64.decodestring(incoming_data)
        self.DEBUG('Got challenge:'+data,'ok')
        for pair in re.findall('(\w+\s*=\s*(?:(?:"[^"]+")|(?:[^,]+)))',data):
            key,value=[x.strip() for x in pair.split('=', 1)]
            if value[:1]=='"' and value[-1:]=='"': value=value[1:-1]
            chal[key]=value
        if chal.has_key('qop') and 'auth' in [x.strip() for x in chal['qop'].split(',')]:
            resp={}
            resp['username']=self.username
            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 chal.has_key('rspauth'): self._owner.send(Node('response',attrs={'xmlns':NS_SASL}).__str__())
        else: 
            self.startsasl='failure'
            self.DEBUG('Failed SASL authentification: unknown challenge','error')
        raise NodeProcessed

class Bind(PlugIn):
    """ Bind some JID to the current connection to allow router know of our location."""
    def __init__(self):
        PlugIn.__init__(self)
        self.DBG_LINE='bind'
        self.bound=None

    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 FeaturesHandler(self,conn,feats):
        """ Determine if server supports resource binding and set some internal attributes accordingly. """
        if not feats.getTag('bind',namespace=NS_BIND):
            self.bound='failure'
            self.DEBUG('Server does not requested binding.','error')
            return
        if feats.getTag('session',namespace=NS_SESSION): self.session=1
        else: self.session=-1
        self.bound=[]

    def Bind(self,resource=None):
        """ Perform binding. Use provided resource name or random (if not provided). """
        while self.bound is None and self._owner.Process(1): pass
        if resource: resource=[Node('resource',payload=[resource])]
        else: resource=[]
        resp=self._owner.SendAndWaitForResponse(Protocol('iq',typ='set',payload=[Node('bind',attrs={'xmlns':NS_BIND},payload=resource)]))
        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()
            resp=self._owner.SendAndWaitForResponse(Protocol('iq',typ='set',payload=[Node('session',attrs={'xmlns':NS_SESSION})]))
            if isResultNode(resp):
                self.DEBUG('Successfully opened session.','ok')
                self.session=1
                return 'ok'
            else:
                self.DEBUG('Session open failed.','error')
                self.session=0
        elif resp: self.DEBUG('Binding failed: %s.'%resp.getTag('error'),'error')
        else:
            self.DEBUG('Binding failed: timeout expired.','error')
            return ''

class ComponentBind(PlugIn):
    """ ComponentBind some JID to the current connection to allow router know of our location."""
    def __init__(self, sasl):
        PlugIn.__init__(self)
        self.DBG_LINE='bind'
        self.bound=None
        self.needsUnregister=None
        self.sasl = sasl

    def plugin(self,owner):
        """ Start resource binding, if allowed at this time. Used internally. """
        if not self.sasl:
            self.bound=[]
            return
        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 FeaturesHandler(self,conn,feats):
        """ Determine if server supports resource binding and set some internal attributes accordingly. """
        if not feats.getTag('bind',namespace=NS_BIND):
            self.bound='failure'
            self.DEBUG('Server does not requested binding.','error')
            return
        if feats.getTag('session',namespace=NS_SESSION): self.session=1
        else: self.session=-1
        self.bound=[]

    def Bind(self,domain=None):
        """ Perform binding. Use provided domain name (if not provided). """
        while self.bound is None and self._owner.Process(1): pass
        if self.sasl:
            xmlns = NS_COMPONENT_1
        else:
            xmlns = None
        self.bindresponse = None
        ttl = dispatcher.DefaultTimeout
        self._owner.RegisterHandler('bind',self.BindHandler,xmlns=xmlns)
        self._owner.send(Protocol('bind',attrs={'name':domain},xmlns=NS_COMPONENT_1))
        while self.bindresponse is None and self._owner.Process(1) and ttl > 0: ttl-=1
        self._owner.UnregisterHandler('bind',self.BindHandler,xmlns=xmlns)
        resp=self.bindresponse
        if resp and resp.getAttr('error'):
            self.DEBUG('Binding failed: %s.'%resp.getAttr('error'),'error')
        elif resp:
            self.DEBUG('Successfully bound.','ok')
            return 'ok'
        else:
            self.DEBUG('Binding failed: timeout expired.','error')
            return ''

    def BindHandler(self,conn,bind):
        self.bindresponse = bind
        pass