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Verify certificates using native system trust stores

Project description



Truststore is a library which exposes native system certificate stores (ie "trust stores") through an ssl.SSLContext-like API. This means that Python applications no longer need to rely on certifi as a root certificate store. Native system certificate stores have many helpful features compared to a static certificate bundle like certifi:

  • Automatically update certificates as new CAs are created and removed
  • Fetch missing intermediate certificates
  • Check certificates against certificate revocation lists (CRLs) to avoid monster-in-the-middle (MITM) attacks
  • Managed per-system rather than per-application by a operations/IT team
  • PyPI is no longer a CA distribution channel 🥳

Right now truststore is a stand-alone library that can be installed globally in your application to immediately take advantage of the benefits in Python 3.10+. Truststore has also been integrated into pip as an opt-in method for verifying HTTPS certificates with truststore instead of certifi.

Long-term the hope is to make truststore the default way to verify HTTPS certificates in pip and to add this functionality into Python itself. Wish us luck!


Truststore is installed from PyPI with pip:

$ python -m pip install truststore

Truststore requires Python 3.10 or later and supports the following platforms:

User Guide

You can inject truststore into the standard library ssl module so the functionality is used by every library by default. To do so use the truststore.inject_into_ssl() function:

import truststore

# Automatically works with urllib3, requests, aiohttp, and more:
import urllib3
http = urllib3.PoolManager()
resp = http.request("GET", "")

import aiohttp
http = aiohttp.ClientSession()
resp = await http.request("GET", "")

import requests
resp = requests.get("")

If you'd like finer-grained control you can create your own truststore.SSLContext instance and use it anywhere you'd use an ssl.SSLContext:

import ssl
import truststore

ctx = truststore.SSLContext(ssl.PROTOCOL_TLS_CLIENT)

import urllib3
http = urllib3.PoolManager(ssl_context=ctx)
resp = http.request("GET", "")

You can read more in the user guide in the documentation.



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