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Feature: Verify JWT by JWK discovered by well known OpenId Connect Discovery endpoint #126

@wassy92x

Description

@wassy92x

We maintain an identity server (IdentityServerr4 for .NET) which provides an well known endpoint to discover all other endpoints.
Among other things there is an URL for the currently used JWKs (jwks_uri).

Example:

{
   "issuer":"http://id.company.com",
   "jwks_uri":"http://id.company.com/.well-known/openid-configuration/jwks",
   "authorization_endpoint":"http://id.company.com/connect/authorize",
   "token_endpoint":"http://id.company.com/connect/token",
   "userinfo_endpoint":"http://id.company.com/connect/userinfo",
   "end_session_endpoint":"http://id.company.com/connect/endsession",
   "check_session_iframe":"http://id.company.com/connect/checksession",
   "revocation_endpoint":"http://id.company.com/connect/revocation",
   "introspection_endpoint":"http://id.company.com/connect/introspect",
   "device_authorization_endpoint":"http://id.company.com/connect/deviceauthorization",
   "frontchannel_logout_supported":true,
   "frontchannel_logout_session_supported":true,
   "backchannel_logout_supported":true,
   "backchannel_logout_session_supported":true,
   "scopes_supported":[
      "openid",
      "profile",
      "tenant",
      "roles",
      "offline_access"
   ],
   "claims_supported":[
      "sub",
      "tenant_id",
      "email",
      "name",
      "family_name",
      "given_name",
      "preferred_username",
      "locale",
      "tenant_name",
      "role"
   ],
   "grant_types_supported":[
      "authorization_code",
      "client_credentials",
      "refresh_token",
      "implicit",
      "password",
      "urn:ietf:params:oauth:grant-type:device_code"
   ],
   "response_types_supported":[
      "code",
      "token",
      "id_token",
      "id_token token",
      "code id_token",
      "code token",
      "code id_token token"
   ],
   "response_modes_supported":[
      "form_post",
      "query",
      "fragment"
   ],
   "token_endpoint_auth_methods_supported":[
      "client_secret_basic",
      "client_secret_post"
   ],
   "id_token_signing_alg_values_supported":[
      "RS256"
   ],
   "subject_types_supported":[
      "public"
   ],
   "code_challenge_methods_supported":[
      "plain",
      "S256"
   ],
   "request_parameter_supported":true
}

Example response of jwks_uri:

{
  "keys" : [ {
    "kty" : "RSA",
    "kid" : "1438289820780",
    "use" : "sig",
    "alg" : "RS256",
    "n" : "idWPro_QiAFOdMsJD163lcDIPogOwXogRo3Pct2MMyeE2GAGqV20Sc8QUbuLDfPl-7Hi9IfFOz--JY6QL5l92eV-GJXkTmidUEooZxIZSp3ghRxLCqlyHeF5LuuM5LPRFDeF4YWFQT_D2eNo_w95g6qYSeOwOwGIfaHa2RMPcQAiM6LX4ot-Z7Po9z0_3ztFa02m3xejEFr2rLRqhFl3FZJaNnwTUk6an6XYsunxMk3Ya3lRaKJReeXeFtfTpShgtPiAl7lIfLJH9h26h2OAlww531DpxHSm1gKXn6bjB0NTC55vJKft4wXoc_0xKZhnWmjQE8d9xE8e1Z3Ll1LYbw",
    "e" : "AQAB"
  }, {
    "kty" : "RSA",
    "kid" : "1438289856256",
    "use" : "sig",
    "alg" : "RS256",
    "n" : "zo5cKcbFECeiH8eGx2D-DsFSpjSKbTVlXD6uL5JAy9rYIv7eYEP6vrKeX-x1z70yEdvgk9xbf9alc8siDfAz3rLCknqlqL7XGVAQL0ZP63UceDmD60LHOzMrx4eR6p49B3rxFfjvX2SWSV3-1H6XNyLk_ALbG6bGCFGuWBQzPJB4LMKCrOFq-6jtRKOKWBXYgkYkaYs5dG-3e2ULbq-y2RdgxYh464y_-MuxDQfvUgP787XKfcXP_XjJZvyuOEANjVyJYZSOyhHUlSGJapQ8ztHdF-swsnf7YkePJ2eR9fynWV2ZoMaXOdidgZtGTa4R1Z4BgH2C0hKJiqRy9fB7Gw",
    "e" : "AQAB"
  } ]
}

It would be great if this proxy supports this well known endpoint to validate JWTs.

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