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[Jelmer Vernooij] Kerberos (GSSAPI) SASL authentication mechanism added

This commit is contained in:
Yann Leboulanger 2008-09-27 14:59:12 +00:00
parent 4f50fda145
commit 32b583986f
1 changed files with 38 additions and 3 deletions
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39
src/common/xmpp/auth_nb.py
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@ -23,6 +23,15 @@ 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:
@ -132,16 +141,26 @@ class SASL(PlugIn):
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:
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 and PLAIN mecanisms.', 'error')
self.DEBUG('I can only use DIGEST-MD5, GSSAPI and PLAIN mecanisms.', 'error')
return
self.startsasl='in-process'
self._owner.send(node.__str__())
@ -176,6 +195,22 @@ class SASL(PlugIn):
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 chal.has_key('realm'):
self.realm = chal['realm']