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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Credential managers for L{twisted.mail}.
"""
from __future__ import absolute_import, division
import hmac
import hashlib
from zope.interface import implementer
from twisted.cred import credentials
from twisted.python.compat import nativeString
from twisted.mail._except import IllegalClientResponse
from twisted.mail.interfaces import IClientAuthentication, IChallengeResponse
@implementer(IClientAuthentication)
class CramMD5ClientAuthenticator:
def __init__(self, user):
self.user = user
def getName(self):
return b"CRAM-MD5"
def challengeResponse(self, secret, chal):
response = hmac.HMAC(secret, chal, digestmod=hashlib.md5).hexdigest()
return self.user + b' ' + response.encode('ascii')
@implementer(IClientAuthentication)
class LOGINAuthenticator:
def __init__(self, user):
self.user = user
self.challengeResponse = self.challengeUsername
def getName(self):
return b"LOGIN"
def challengeUsername(self, secret, chal):
# Respond to something like "Username:"
self.challengeResponse = self.challengeSecret
return self.user
def challengeSecret(self, secret, chal):
# Respond to something like "Password:"
return secret
@implementer(IClientAuthentication)
class PLAINAuthenticator:
def __init__(self, user):
self.user = user
def getName(self):
return b"PLAIN"
def challengeResponse(self, secret, chal):
return b'\0' + self.user + b'\0' + secret
@implementer(IChallengeResponse)
class LOGINCredentials(credentials.UsernamePassword):
def __init__(self):
self.challenges = [b'Password\0', b'User Name\0']
self.responses = [b'password', b'username']
credentials.UsernamePassword.__init__(self, None, None)
def getChallenge(self):
return self.challenges.pop()
def setResponse(self, response):
setattr(self, nativeString(self.responses.pop()), response)
def moreChallenges(self):
return bool(self.challenges)
@implementer(IChallengeResponse)
class PLAINCredentials(credentials.UsernamePassword):
def __init__(self):
credentials.UsernamePassword.__init__(self, None, None)
def getChallenge(self):
return b''
def setResponse(self, response):
parts = response.split(b'\0')
if len(parts) != 3:
raise IllegalClientResponse(
"Malformed Response - wrong number of parts")
useless, self.username, self.password = parts
def moreChallenges(self):
return False
__all__ = [
"CramMD5ClientAuthenticator",
"LOGINCredentials", "LOGINAuthenticator",
"PLAINCredentials", "PLAINAuthenticator",
]
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