Hello!!

I'm trying to implement NTLM authentication on IIS (Windows Server 2003) from Windows 7 with python. LAN Manager Authentication Level: Send NTLM response only. Client machine and server are in the same domain. Domain controller (AD) is on another server (also running Windows Server 2003).

I recieve 401.1 - Unauthorized: Access is denied due to invalid credentials. Could you please help me find out what is wrong with this code and/or show me the other possible directions to solve this problem (using NTLM or Kerberos)?

[python] import sys, httplib, base64, string import urllib2 import win32api import sspi import pywintypes import socket

class WindoewNtlmMessageGenerator:
    def __init__(self,user=None):
        import win32api,sspi
        if not user:
            user = win32api.GetUserName()
        self.sspi_client = sspi.ClientAuth("NTLM",user)   

    def create_auth_req(self):
        import pywintypes
        output_buffer = None
        error_msg = None
        try:
            error_msg, output_buffer = self.sspi_client.authorize(None)            
        except pywintypes.error:
            return None
        auth_req = output_buffer[0].Buffer
        auth_req = base64.encodestring(auth_req)
        auth_req = string.replace(auth_req,'\012','')
        return auth_req 

    def create_challenge_response(self,challenge):
        import pywintypes
        output_buffer = None
        input_buffer = challenge
        error_msg = None        
        try:
            error_msg, output_buffer = self.sspi_client.authorize(input_buffer)
        except pywintypes.error:
            return None
        response_msg = output_buffer[0].Buffer       
        response_msg = base64.encodestring(response_msg)
        response_msg = string.replace(response_msg,'\012','')
        return response_msg 


fname='request.xml'
request = file(fname).read()
ip_host = '10.0.3.112'

ntlm_gen = WindoewNtlmMessageGenerator()
auth_req_msg = ntlm_gen.create_auth_req()
auth_req_msg_dec = base64.decodestring(auth_req_msg)
auth_req_msg = string.replace(auth_req_msg,'\012','')
webservice = httplib.HTTPConnection(ip_host) 
webservice.putrequest("POST", "/idc/idcplg")
webservice.putheader("Content-length", "%d" % len(request)) 
webservice.putheader('Authorization', 'NTLM'+' '+auth_req_msg) 
webservice.endheaders()
resp = webservice.getresponse()
resp.read()

challenge = resp.msg.get('WWW-Authenticate')
challenge_dec = base64.decodestring(challenge.split()[1])

msg3 = ntlm_gen.create_challenge_response(challenge_dec)
webservice = httplib.HTTP(ip_host) 
webservice.putrequest("POST", "/idc/idcplg?IdcService=LOGIN&Auth=Intranet")
webservice.putheader("Host", SHOD)
webservice.putheader("Content-length", "%d" % len(request))
webservice.putheader('Authorization', 'NTLM'+' '+msg3) 
webservice.putheader("Content-type", "text/xml; charset=\"UTF-8\"")
webservice.putheader("SOAPAction", "\"\"")
webservice.endheaders()
webservice.send(request)
statuscode, statusmessage, header = webservice.getreply()
res = webservice.getfile().read()
res_file = file('result.txt','wb')
res_file.write(res)
res_file.close()

[/python]

sspi.py is available here: http://www.koders.com/python/fidF3B0061A07CD13BA35FF263E3E45252CFABFAA3B.aspx?s=timer

Thanks!