Authenticating against active directory using python + ldap

Posted on

Question :

Authenticating against active directory using python + ldap

How do I authenticate against AD using Python + LDAP. I’m currently using the python-ldap library and all it is producing is tears.

I can’t even bind to perform a simple query:

import sys
import ldap

Server = "ldap://my-ldap-server"
DN, Secret, un = sys.argv[1:4]

Base = "dc=mydomain,dc=co,dc=uk"
Scope = ldap.SCOPE_SUBTREE
Filter = "(&(objectClass=user)(sAMAccountName="+un+"))"
Attrs = ["displayName"]

l = ldap.initialize(Server)
l.protocol_version = 3
print l.simple_bind_s(DN, Secret)

r =, Scope, Filter, Attrs)
Type,user = l.result(r,60)
Name,Attrs = user[0]
if hasattr(Attrs, 'has_key') and Attrs.has_key('displayName'):
  displayName = Attrs['displayName'][0]
  print displayName


Running this with password username gives me one of two errors:

Invalid Credentials – When I mistype or intentionally use wrong credentials it fails to authenticate.

ldap.INVALID_CREDENTIALS: {‘info’: ‘80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error, data 52e, vece’, ‘desc’: ‘Invalid credentials’}


ldap.OPERATIONS_ERROR: {‘info’: ‘00000000: LdapErr: DSID-0C090627, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, vece’, ‘desc’: ‘Operations error’}

What am I missing out to bind properly?

I am getting the same errors on fedora and windows.

Asked By: 1729


Answer #1:

I was missing

l.set_option(ldap.OPT_REFERRALS, 0)

From the init.

Answered By: 1729

Answer #2:

If you are open to using pywin32, you can use Win32 calls from Python. This is what we do in our CherryPy web server:

import win32security
token = win32security.LogonUser(
authenticated = bool(token)
Answered By: davidavr

Answer #3:

That worked for me, l.set_option(ldap.OPT_REFERRALS, 0) was the key to access the ActiveDirectory. Moreover, I think that you should add an “con.unbind()” in order to close the connection before finishing the script.

Answered By: alfredocambera

Answer #4:

Here’s some simple code that works for me.

import ldap  # run 'pip install python-ldap' to install ldap module.
conn ="")
conn.simple_bind_s("", "mypassword")

This is based on a previous answer.

Answered By: JohnMudd

Answer #5:

if you have Kerberos installed and talking to AD, as would be the case with, say, Centrify Express installed and running, you might just use python-kerberos. E.g.

import kerberos

would return True a user ‘joe’ has password ‘pizza’ in the Kerberos realm X.PIZZA.COM.
(typically, I think, the latter would be the same as the name of the AD Domain)

Answered By: Dima Pasechnik

Answer #6:

I see your comment to @Johan Buret about the DN not fixing your problem, but I also believe that is what you should look into.

Given your example, the DN for the default administrator account in AD will be:
cn=Administrator,cn=Users,dc=mydomain,dc=co,dc=uk – please try that.

Answered By: Daniel Bungert

Answer #7:

Based on the excellent ldap3 tutorial:

>>> from ldap3 import Server, Connection, ALL, NTLM
>>> server = Server('server_name_or_ip', get_info=ALL)
>>> conn = Connection(server, user="user_name", password="password", auto_bind=True)
>>> conn.extend.standard.who_am_i()

I did the above in Python3 but it’s supposed to be compatible with Python 2.

Answered By: Nagev

Answer #8:

I tried to add

l.set_option(ldap.OPT_REFERRALS, 0)

but instead of an error Python just hangs and won’t respond to anything any more. Maybe I’m building the search query wrong, what is the Base part of the search? I’m using the same as the DN for the simple bind (oh, and I had to do l.simple_bind, instead of l.simple_bind_s):

import ldap
local = ldap.initialize("ldap://")
#my pc is not actually connected to this domain 
result_id ="CN=staff,DC=mydomain,DC=com", ldap.SCOPE_SUBTREE, "cn=foobar", None)
local.set_option(ldap.OPT_REFERRALS, 0)
result_type, result_data = local.result(result_id, 0)

I’m using AD LDS and the instance is registered for the current account.

Answered By: lanoxx

Leave a Reply

Your email address will not be published. Required fields are marked *