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.
#4285

Thanks

[syedparveez]

@pieterphilippaerts, @leastprivilege

[leastprivilege]

Important update

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