Parse x509v3 certificates and PKCS7 signatures
This is a fork of a fork of a fork of the original project:
py3x509 - Python library for parsing X.509 Copyright (C) 2009-2012 CZ.NIC, z.s.p.o. (http://www.nic.cz)
- Forked from https://github.com/ph4r05/px509
- Forked from https://github.com/erny/pyx509
- Forked from https://github.com/hiviah/pyx509
Updates by me rename the module to ‘x509’ and update to Python3 only.
Copyright (C) 2017 <firstname.lastname@example.org> (https://github.com/cniemira/py3x509)
Work in progress!
This is probably the most complete parser of X.509 certificates in python.
Code is in alpha stage! Don’t use for anything sensitive. I wrote it (based on previous work of colleagues) since there is no comprehensive python parser for X.509 certificates. Often python programmers had to parse openssl output.
- I find it less painful to use than parsing output of ‘openssl x509’ somewhat stricter in extension parsing compared to openssl
- It’s slow compared to openssl (about 2.3x compared to RHEL’s openssl-1.0-fips)
- Currently not very strict in what string types in RDNs it accepts
- API is still rather ugly and has no documentation yet; code is nasty at some places (and there’s some old dangling code like pkcs7/verifier.py)
- pyasn1 >= 0.1.7
Install with pip:
pip install py3x509
LGPL v2 or later.
Known bugs and quirks
- Subject alternative name doesn’t show all subtypes, but ‘DNS’, ‘dirName’ and ‘email’ are supported.
- Name constraints don’t distinguish among various GeneralName subtypes
- Some extensions are not shown very nicely when put in string format
- Not all extensions are supported
- String types accepted for various RDN subelements are rather too permissive
- RDN string conversion does not conform to RFC 4514
- Badly formed extensions are ignored if not marked critical
- easy to switch to more strict behavior
- other clients do this as well; RFC 5280 specifies behavior for unknown elements in extensions in appendix B.1, but does not cover all cases (e.g. element exists, but with string type different from spec)
- Cleanup: This module has it’s own pyasn1 models. Look if we can reuse the pyasn1_modules.rfc2459 X509 cert model.
- Cleanup: Currently, the signature verifier does not work.
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