I'm unable to fetch CNF value in the Token. My Identity Model package version 5.1.0age is

[syedparveez]

I'm testing mTLS with the latest version of IdentityServer4 (straight from the repository). I've configured a client on the test site to use/require mTLS and this works perfectly. (I've verified that I cannot get a token without the client certificate I've configured.)

However, when I look at the JWT token that the server returns, there seems to be a problem with the cnf claim. According to the mTLS specification (RFC8705), the cnf claim should have a property "x5t#S256" that holds the hash of the certificate that was used when the token was requested. However, this is the (unpacked) token I got from IdentityServer4:

{ "alg": "RS256", "kid": "BD55BCDFD7DC43A6BACD426E6EC1E18AEC3CE375RS256", "typ": "at+jwt", "x5t": "vVW839fcQ6a6zUJubsHhiuw843U" } { "nbf": 1586950818, "exp": 1586951418, "iss": "https://localhost:44365", "client_id": "secure_client", "sub": "88421113", "auth_time": 1586947791, "idp": "local", "jti": "7CC98784B028BC9B707F5359CB21353B", "sid": "3CD31E0C8B6054ED80EAC2095EBB1335", "scope": [ "IdentityServerApi", "offline_access" ], "amr": [ "pwd" ], "cnf": { "x5t#S256": [] } }

I did refer the below link, But I'm using Identity Model package version 5.1.0 but I still don't receive the CNF value. https://github.com/IdentityServer/IdentityServer4/issues/4285

Thanks

[syedparveez]

@pieterphilippaerts, @leastprivilege

[leastprivilege]

Important update

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