Session validation endpoint worked in AM5 but doesn’t work in AM6

For the last few days I’ve struggled getting AM6(Forgerock Access Management) to work with the same config as AM5. I’m trying to validate a session, after an user performed the OpenID Connect Authorization Code Flow.

My setup:

1. I’ve deployed an AM instance

2. Configured OpenID Connect from the Common tasks.

3. Added an OAuth2 client, from Applications -> OAuth 2.0. Setup all configs: redirect uris, scopes lifetimes etc and set “Token Endpoint Authentication Method” to client_secret_post

4. (OPTIONAL) Added implied consent to OAuth 2.0 Client, and then set Services -> Oauth2 Provider -> Consent -> Allow clients to skip consent = true

My token usage:

1. After redirecting the user to the login screen(and receiving the code), I make a POST to the token endpoint (/oauth2/access_token) with form_params

   (
       [client_id] => my_client
       [client_secret] => my_client_pass
       [code] => a5867a21-4d5a-4285-ba07-dcbe46d53bc6
       [redirect_uri] => http://localhost:3000/auth/callback
       [grant_type] => authorization_code
   )
   

2. The redirect_uri endpoint receives access_token and id_token

   (
       [access_token] => e78569fb-e162-4e4f-ab5e-79ebeaf2ba94
       [scope] => openid offline_access profile email
       [id_token] => eyJ0eXAiOiJKV1QiLCJraWQiOiJiL.......
       [token_type] => Bearer
       [expires_in] => 35999
   )
   

3. (HERE’S THE PROBLEM) I then check to see if the user’s session, with the given id_token, is still valid (he has logged out or not) I make a POST to the sessions endpoint(/json/sessions) with

   (
       'headers' => [
           'Accept-API-Version' => 'resource=1.2'
       ],
       'query' => [
           '_action' => 'validate',
           'tokenId' => eyJ0eXAiOiJKV1QiLCJraWQiOiJiL082T.......
       ],
   )
   

When tried against AM5 I get

{"valid":true,"uid":"my-user-here","realm":"/"}

When tried against AM6.0.0.4 I always get:

{"valid":false}

Am I missing something which prevents the generated openid id_token to be available in the sessions endpoint?

If anyone stumbles across the same issue, I've found that I missed an important setting that was added in AM6: Authorized OIDC SSO Clients.

This forces your session id to be the same as your id_token from OpenID Connect.

Another solution would be to look into using the /oauth2/connect/checkSession endpoint for validating the token