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import sys
import hmac
from sleekxmpp.thirdparty.suelta.util import hash, bytes
from sleekxmpp.thirdparty.suelta.sasl import Mechanism, register_mechanism
from sleekxmpp.thirdparty.suelta.exceptions import SASLError, SASLCancelled
class CRAM_MD5(Mechanism):
"""
"""
def __init__(self, sasl, name):
"""
"""
super(CRAM_MD5, self).__init__(sasl, name, 2)
self.hash = hash(name[5:])
if self.hash is None:
raise SASLCancelled(self.sasl, self)
if not self.sasl.tls_active():
if not self.sasl.sec_query(self, 'CRAM-MD5'):
raise SASLCancelled(self.sasl, self)
def prep(self):
"""
"""
if 'savepass' not in self.values:
if self.sasl.sec_query(self, 'CLEAR-PASSWORD'):
self.values['savepass'] = True
if 'savepass' not in self.values:
del self.values['password']
def process(self, challenge=None):
"""
"""
if challenge is None:
return None
self.check_values(['username', 'password'])
username = bytes(self.values['username'])
password = bytes(self.values['password'])
mac = hmac.HMAC(key=password, digestmod=self.hash)
mac.update(challenge)
return username + b' ' + bytes(mac.hexdigest())
def okay(self):
"""
"""
return True
def get_user(self):
"""
"""
return self.values['username']
register_mechanism('CRAM-', 20, CRAM_MD5)
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