From fb26284c00e09e656732eb7ca4570afd052e0067 Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <Jacek@jacekk.info>
Date: Fri, 21 Jun 2024 11:47:01 +0000
Subject: [PATCH] Improve error reporting in CAS ticket validation

---
 src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java |   19 ++++++++-----------
 1 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java b/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
index dfe8321..7bb0445 100644
--- a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
+++ b/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
@@ -6,23 +6,20 @@
 import org.apache.http.HttpEntity;
 import org.jboss.logging.Logger;
 import org.keycloak.common.util.KeycloakUriBuilder;
-import org.keycloak.common.util.Time;
 import org.keycloak.events.Details;
 import org.keycloak.events.EventBuilder;
 import org.keycloak.events.EventType;
 import org.keycloak.forms.login.LoginFormsProvider;
 import org.keycloak.models.*;
 import org.keycloak.protocol.LoginProtocol;
+import org.keycloak.protocol.cas.endpoints.AbstractValidateEndpoint;
 import org.keycloak.protocol.cas.utils.LogoutHelper;
-import org.keycloak.protocol.oidc.utils.OAuth2Code;
-import org.keycloak.protocol.oidc.utils.OAuth2CodeParser;
 import org.keycloak.services.ErrorPage;
 import org.keycloak.services.managers.ResourceAdminManager;
 import org.keycloak.sessions.AuthenticationSessionModel;
 
 import java.io.IOException;
 import java.net.URI;
-import java.util.UUID;
 
 public class CASLoginProtocol implements LoginProtocol {
     private static final Logger logger = Logger.getLogger(CASLoginProtocol.class);
@@ -35,11 +32,17 @@
     public static final String GATEWAY_PARAM = "gateway";
     public static final String TICKET_PARAM = "ticket";
     public static final String FORMAT_PARAM = "format";
+    public static final String PGTURL_PARAM = "pgtUrl";
+    public static final String TARGET_SERVICE_PARAM = "targetService";
+    public static final String PGT_PARAM = "pgt";
 
     public static final String TICKET_RESPONSE_PARAM = "ticket";
     public static final String SAMLART_RESPONSE_PARAM = "SAMLart";
 
     public static final String SERVICE_TICKET_PREFIX = "ST-";
+    public static final String PROXY_GRANTING_TICKET_IOU_PREFIX = "PGTIOU-";
+    public static final String PROXY_GRANTING_TICKET_PREFIX = "PGT-";
+    public static final String PROXY_TICKET_PREFIX = "PT-";
     public static final String SESSION_SERVICE_TICKET = "service_ticket";
 
     public static final String LOGOUT_REDIRECT_URI = "CAS_LOGOUT_REDIRECT_URI";
@@ -98,15 +101,9 @@
         String service = authSession.getRedirectUri();
         //TODO validate service
 
-        OAuth2Code codeData = new OAuth2Code(UUID.randomUUID().toString(),
-                Time.currentTime() + userSession.getRealm().getAccessCodeLifespan(),
-                null, null, authSession.getRedirectUri(), null, null,
-                userSession.getId());
-        String code = OAuth2CodeParser.persistCode(session, clientSession, codeData);
-
         KeycloakUriBuilder uriBuilder = KeycloakUriBuilder.fromUri(service);
 
-        String loginTicket = SERVICE_TICKET_PREFIX + code;
+        String loginTicket = AbstractValidateEndpoint.getST(session, clientSession, service);
 
         if (authSession.getClientNotes().containsKey(CASLoginProtocol.TARGET_PARAM)) {
             // This was a SAML 1.1 auth request so return the ticket ID as "SAMLart" instead of "ticket"

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