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python requests ntlm

Narkw Brahma

Narkw Brahma

• 1 min read

Python Requests NTLM: An Overview

If you are working with web applications in Python, you might have come across the need to authenticate with NTLM (Microsoft's authentication protocol) to access certain resources. The Python Requests library provides an easy-to-use way to make HTTP requests, but it does not support NTLM authentication out-of-the-box. However, there are third-party libraries and packages that can be used to add NTLM support to Requests. In this article, we will explore some of these options.

Option 1: requests-ntlm package

One of the most popular packages for NTLM authentication with Requests is the requests-ntlm package. This package provides a simple way to add NTLM authentication to your Requests session. To use it, you first need to install it:


pip install requests-ntlm

After installing requests-ntlm, you can use the HttpNtlmAuth class to authenticate with NTLM:


import requests
from requests_ntlm import HttpNtlmAuth

url = 'https://example.com/api'
response = requests.get(url, auth=HttpNtlmAuth('DOMAIN\\username','password'))

Option 2: ntlm-auth package

Another popular package for NTLM authentication is ntlm-auth. This package provides more granular control over the NTLM authentication process than requests-ntlm, but it can be more complex to set up. To use it, you first need to install it:


pip install ntlm-auth

After installing ntlm-auth, you can use the HttpNtlmAuth class to authenticate with NTLM:


import requests
from ntlm_auth import HttpNtlmAuth

url = 'https://example.com/api'
session = requests.Session()
session.auth = HttpNtlmAuth('DOMAIN\\username', 'password')
response = session.get(url)

Option 3: Manually adding NTLM headers

If you prefer not to use a third-party package, you can manually add NTLM headers to your Requests session. This approach is more manual and may require more work, but it provides you with more control over the authentication process. Here's an example:


import requests
from requests_ntlm import HttpNtlmAuth

url = 'https://example.com/api'
session = requests.Session()
session.auth = HttpNtlmAuth('DOMAIN\\username', 'password')

# Manually add the NTLM headers
session.headers['Authorization'] = 'NTLM ' + session.auth.initiate_auth()
response = session.get(url)
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