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digest.py
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digest.py
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# Copyright (C) 2008-2012 AG Projects. See LICENSE for details
from hashlib import md5
from time import time
from base64 import b64encode, b64decode
import random
def get_random_data(length):
return ''.join(chr(random.randint(0, 255)) for x in xrange(length))
class LoginFailed(Exception):
pass
def calc_ha1(**parameters):
ha1_text = "%(username)s:%(realm)s:%(password)s" % parameters
return md5(ha1_text).hexdigest()
def calc_ha2_response(**parameters):
ha2_text = "%(method)s:%(uri)s" % parameters
return md5(ha2_text).hexdigest()
def calc_ha2_rspauth(**parameters):
ha2_text = ":%(uri)s" % parameters
return md5(ha2_text).hexdigest()
def calc_hash(**parameters):
hash_text = "%(ha1)s:%(nonce)s:%(nc)s:%(cnonce)s:auth:%(ha2)s" % parameters
return md5(hash_text).hexdigest()
def calc_responses(**parameters):
if parameters.has_key("ha1"):
ha1 = parameters.pop("ha1")
else:
ha1 = calc_ha1(**parameters)
ha2_response = calc_ha2_response(**parameters)
ha2_rspauth = calc_ha2_rspauth(**parameters)
response = calc_hash(ha1 = ha1, ha2 = ha2_response, **parameters)
rspauth = calc_hash(ha1 = ha1, ha2 = ha2_rspauth, **parameters)
return response, rspauth
def process_www_authenticate(username, password, method, uri, **parameters):
nc = "00000001"
cnonce = get_random_data(16).encode("hex")
parameters["username"] = username
parameters["password"] = password
parameters["method"] = method
parameters["uri"] = uri
response, rsp_auth = calc_responses(nc = nc, cnonce = cnonce, **parameters)
authorization = {}
authorization["username"] = username
authorization["realm"] = parameters["realm"]
authorization["nonce"] = parameters["nonce"]
authorization["qop"] = "auth"
authorization["nc"] = nc
authorization["cnonce"] = cnonce
authorization["response"] = response
authorization["opaque"] = parameters["opaque"]
return authorization, rsp_auth
class AuthChallenger(object):
def __init__(self, expire_time):
self.expire_time = expire_time
self.key = get_random_data(16)
def generate_www_authenticate(self, realm, peer_ip):
www_authenticate = {}
www_authenticate["realm"] = realm
www_authenticate["qop"] = "auth"
nonce = get_random_data(16) + "%.3f:%s" % (time(), peer_ip)
www_authenticate["nonce"] = b64encode(nonce)
opaque = md5(nonce + self.key)
www_authenticate["opaque"] = opaque.hexdigest()
return www_authenticate
def process_authorization_ha1(self, ha1, method, uri, peer_ip, **parameters):
parameters["method"] = method
parameters["uri"] = uri
try:
nonce = parameters["nonce"]
opaque = parameters["opaque"]
response = parameters["response"]
except IndexError, e:
raise LoginFailed("Parameter not present: %s", e.message)
try:
expected_response, rspauth = calc_responses(ha1 = ha1, **parameters)
except:
raise
#raise LoginFailed("Parameters error")
if response != expected_response:
raise LoginFailed("Incorrect password")
try:
nonce_dec = b64decode(nonce)
issued, nonce_ip = nonce_dec[16:].split(":", 1)
issued = float(issued)
except:
raise LoginFailed("Could not decode nonce")
if nonce_ip != peer_ip:
raise LoginFailed("This challenge was not issued to you")
expected_opaque = md5(nonce_dec + self.key).hexdigest()
if opaque != expected_opaque:
raise LoginFailed("This nonce/opaque combination was not issued by me")
if issued + self.expire_time < time():
raise LoginFailed("This challenge has expired")
authentication_info = {}
authentication_info["qop"] = "auth"
authentication_info["cnonce"] = parameters["cnonce"]
authentication_info["nc"] = parameters["nc"]
authentication_info["rspauth"] = rspauth
return authentication_info
def process_authorization_password(self, password, method, uri, peer_ip, **parameters):
ha1 = calc_ha1(password = password, **parameters)
return self.process_authorization_ha1(ha1, method, uri, peer_ip, **parameters)

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