如何获得“x5t"的值?使用证书凭据进行应用程序身份验证 [英] How to obtain value of "x5t" using Certificate credentials for application authentication

问题描述

I was trying to obtain JWT token from Microsoft Azure Active Directory using Certificate credentials for application authentication.

I am struck at figuring out the value of "x5t".

I have tried with

• SHA-1 fingerprint value available in the public certificate.
• SHA-1 hash of the public certificate using FVIC.

But i keep getting below error when send the request to MSA login endpoint

{
    "error": "invalid_client",
    "error_description": "AADSTS70002: Error validating credentials. AADSTS50012: Client assertion contains an invalid signature. [Reason - The key was not found., Thumbprint of key used by client: '6F67F76B96F6FBBDF9D3EE1DDF7F9A7B877EE9C75DEDBD3DE9C7FB', Configured keys: [Key0:Start=06/01/2018, End=12/31/2099, Thumbprint=6WGktXA64QmA9TPv;Key1:Start=06/01/2018, End=12/31/2099, Thumbprint=rD9Q10sR6Q6ZkDVw;]]
Trace ID: d9e3e276-e878-4b8a-b08b-10c82a0b0600
Correlation ID: 48ec889d-2376-45a6-9bf0-01b22b0e0c17
Timestamp: 2018-06-01 09:38:24Z",
    "error_codes": [
        70002,
        50012
    ],
    "timestamp": "2018-06-01 09:38:24Z",
    "trace_id": "d9e3e276-e878-4b8a-b08b-10c82a0b0600",
    "correlation_id": "48ec889d-2376-45a6-9bf0-01b22b0e0c17"
}

How to obtain the value for "x5t" ?

解决方案

I found this site and this one invaluable for solving the x5t issue. The easiest way to do it is to manually get the fingerprint:

echo $(openssl x509 -in your.cert.pem -fingerprint -noout) | sed 's/SHA1 Fingerprint=//g' | sed 's/://g' | xxd -r -ps | base64

the value from the above command is the value you put in the x5t field in the JWT. Prior to that I was getting invalid fingerprint error from azure.

If you're using Ruby you can follow this answer to get:

p12 = OpenSSL::PKCS12.new(File.read(CERT_FILE), '')
x509_sha1_thumbprint = Base64.encode64(OpenSSL::Digest::SHA1.new(p12.certificate.to_der).to_s.upcase.scan(/../).map(&:hex).pack("c*")).strip
jwt_token = JWT.encode payload, p12.key, 'RS256', { typ: 'JWT', x5t: x509_sha1_thumbprint }

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