[keycloak-dev] Accessing Token Endpoint with a User access token to get Permissions

[Mark McGuigan]

HI Pedro,

Sure, my process is as follows:

  *   Application forwards to Authorisation service to get a response type of  ‘code’
  *   Authorisation service returns code and I forward it to the Token endpoint (no bearer) to get an access token
  *   The Access Token contains the user authentication JWT at this point (contains Roles but not permissions)
  *   Then I try to pass this access token as a ‘bearer’ to the token endpoint to get user permission but this is where I get the 500 Error described below

Any pointers as to what I could be doing wrong would really be appreciated..
Kind regards,

Mark


From: Pedro Igor Silva [mailto:psilva at redhat.com]
Sent: 22 June 2018 15:42
To: Mark McGuigan <Mark.McGuigan at 360globalnet.com>
Cc: keycloak-dev at lists.jboss.org
Subject: Re: [keycloak-dev] Accessing Token Endpoint with a User access token to get Permissions

Hi,

Are you sending the access token or ID token as a bearer ? Could you give more details on how you are obtaining the token ?











On Wed, Jun 20, 2018 at 5:52 AM, Mark McGuigan <Mark.McGuigan at 360globalnet.com<mailto:Mark.McGuigan at 360globalnet.com>> wrote:
Hi,

Apologies if this email is incorrectly posted.

I'm using the newly released Keycloak 4 and I've been able to successfully get an access token for a user from an access code posted back to my application. This doesn't contain any permissions on the token (Rightly so, only roles)
I'm now trying to get an RPT with permissions from the of client application that reflect what the User is allowed to do.

My request looks something like:
POST /auth/realms/MyRealm/protocol/openid-connect/token HTTP/1.1
Host: localhost:8080
Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5c ...
Content-Type: application/x-www-form-urlencoded
Cache-Control: no-cache
Postman-Token: 4054feaf-a9d7-48e2-99b6-eabc86bf8da5

grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Auma-ticket&audience=MyClient&permission=Default+Resource

Where the Bearer is the generated access_token. However I'me getting a response of :

500 Internal Server Error
{
    "error": "server_error",
    "error_description": "Unexpected error while evaluating permissions"
}

And a stack trace of:

Unexpected error while evaluating permissions: java.lang.RuntimeException: Error while reading attributes from security token.
        at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:139)
        at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:68)
        at org.keycloak.authorization.authorization.AuthorizationTokenService.lambda$static$1(AuthorizationTokenService.java:124)
        at org.keycloak.authorization.authorization.AuthorizationTokenService.createEvaluationContext(AuthorizationTokenService.java:311)
        at org.keycloak.authorization.authorization.AuthorizationTokenService.authorize(AuthorizationTokenService.java:161)
        at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.permissionGrant(TokenEndpoint.java:1124)
        at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.processGrantRequest(TokenEndpoint.java:190)
.....
Caused by: java.lang.NullPointerException
        at org.keycloak.services.util.DefaultClientSessionContext.fromClientSessionScopeParameter(DefaultClientSessionContext.java:64)
        at org.keycloak.authorization.common.KeycloakIdentity.<init>(KeycloakIdentity.java:123)

Any Ideas what I may be doing wrong? Any help appreciated.

Regards,

Mark
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