python - 从 AAD Azure 验证 JWT access

问题描述

我需要从我正在处理的服务中验证一个 azure jwt access_token。我们目前正在向https://graph.microsoft.com/beta/me提出请求。如果请求成功，则令牌有效。不幸的是，我们将无法继续这样做。

为此，我尝试了各种想法。他们都没有成功。甚至 jwt.io 也无法识别签名，即使 jwtkid和jwk_urikid中的可用签名之一匹配。

我的实现与博客文章非常相似，但有一些更改：

#!/usr/bin/env python2

import jwt
import requests
import sys

from cryptography.x509 import load_pem_x509_certificate
from cryptography.hazmat.backends import default_backend


def get_public_key(access_token):
    """ Retrieve public key for access token """
    token_header = jwt.get_unverified_header(access_token)

    res = requests.get('https://login.microsoftonline.com/common/.well-known/openid-configuration')
    jwk_uri = res.json()['jwks_uri']

    res = requests.get(jwk_uri)
    jwk_keys = res.json()

    x5c = None
    # Iterate JWK keys and extract matching x5c chain
    for key in jwk_keys['keys']:
        if key['kid'] == token_header['kid']:
            x5c = key['x5c']
            break
    else:
        raise Exception('Certificate not found in {}'.format(jwk_uri))

    cert = ''.join([
        '-----BEGIN CERTIFICATE-----\n',
        x5c[0],
        '\n-----END CERTIFICATE-----\n',
    ])
    try:
        public_key =  load_pem_x509_certificate(cert.encode(), default_backend()).public_key()
    except Exception as error:
        raise Exception('Failed to load public key:', error)

    return public_key, key['kid']

def main():
    print '\n'
    if len(sys.argv) < 2 or '-h' in sys.argv:
        print 'Run it again passing acces token:\n\tpython jwt_validation.py <access_token>'
        sys.exit(1)

    access_token = sys.argv[1]
    audience = 'https://graph.microsoft.com'

    public_key, kid = get_public_key(access_token)

    try:
        jwt.decode(
            access_token,
            public_key,
            algorithms='RS256',
            audience=audience,
        )
    except Exception as error:
        print 'key {} did not worked, error:'.format(kid), error
        sys.exit(1)

    print('Key worked!')

if __name__ == '__main__':
    main()

此解决方案返回Invalid Signature具有以下回溯的有效 access_token：

Traceback (most recent call last):
File "jwt_validation/jwt_validation.py", line 63, in <module>
    main()
File "jwt_validation/jwt_validation.py", line 57, in main 
    audience=audience,
File "~/.pyenv/versions/jwt-validation-tool/lib/python2.7/site-packages/jwt/api_jwt.py", line 93, in decode
    jwt, key=key, algorithms=algorithms, options=options, **kwargs
File "~/.pyenv/versions/jwt-validation-tool/lib/python2.7/site-packages/jwt/api_jws.py", line 157, in decode
    key, algorithms)
File "~/.pyenv/versions/jwt-validation-tool/lib/python2.7/site-packages/jwt/api_jws.py", line 224, in _verify_signature
    raise InvalidSignatureError('Signature verification failed')
jwt.exceptions.InvalidSignatureError: Signature verification failed

任何关于我可能错的想法都会有所帮助。

标签： pythonazurejwtazure-active-directorymicrosoft-graph-api

python - 从 AAD Azure 验证 JWT access_token 失败

问题描述

解决方案

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