From befd2a8cf0de1002dad1db7320fd1a2198b89b75 Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <Jacek@jacekk.info>
Date: Fri, 21 Jun 2024 09:32:30 +0000
Subject: [PATCH] Improve error reporting in CAS ticket validation

---
 src/main/java/org/keycloak/protocol/cas/endpoints/AuthorizationEndpoint.java |   33 ++++++++++++++++++++++++---------
 1 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/src/main/java/org/keycloak/protocol/cas/endpoints/AuthorizationEndpoint.java b/src/main/java/org/keycloak/protocol/cas/endpoints/AuthorizationEndpoint.java
index 2981732..1dc2eef 100644
--- a/src/main/java/org/keycloak/protocol/cas/endpoints/AuthorizationEndpoint.java
+++ b/src/main/java/org/keycloak/protocol/cas/endpoints/AuthorizationEndpoint.java
@@ -1,12 +1,15 @@
 package org.keycloak.protocol.cas.endpoints;
 
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.core.MultivaluedMap;
+import jakarta.ws.rs.core.Response;
 import org.jboss.logging.Logger;
 import org.keycloak.events.Details;
 import org.keycloak.events.Errors;
 import org.keycloak.events.EventBuilder;
 import org.keycloak.events.EventType;
 import org.keycloak.models.ClientModel;
-import org.keycloak.models.RealmModel;
+import org.keycloak.models.KeycloakSession;
 import org.keycloak.protocol.AuthorizationEndpointBase;
 import org.keycloak.protocol.cas.CASLoginProtocol;
 import org.keycloak.protocol.oidc.utils.RedirectUtils;
@@ -15,10 +18,6 @@
 import org.keycloak.services.util.CacheControlUtil;
 import org.keycloak.sessions.AuthenticationSessionModel;
 
-import javax.ws.rs.GET;
-import javax.ws.rs.core.MultivaluedMap;
-import javax.ws.rs.core.Response;
-
 public class AuthorizationEndpoint extends AuthorizationEndpointBase {
     private static final Logger logger = Logger.getLogger(AuthorizationEndpoint.class);
 
@@ -26,8 +25,8 @@
     private AuthenticationSessionModel authenticationSession;
     private String redirectUri;
 
-    public AuthorizationEndpoint(RealmModel realm, EventBuilder event) {
-        super(realm, event);
+    public AuthorizationEndpoint(KeycloakSession session, EventBuilder event) {
+        super(session, event);
         event.event(EventType.LOGIN);
     }
 
@@ -35,6 +34,13 @@
     public Response build() {
         MultivaluedMap<String, String> params = session.getContext().getUri().getQueryParameters();
         String service = params.getFirst(CASLoginProtocol.SERVICE_PARAM);
+
+        boolean isSaml11Request = false;
+        if (service == null && params.containsKey(CASLoginProtocol.TARGET_PARAM)) {
+            // SAML 1.1 authorization uses the TARGET parameter instead of service
+            service = params.getFirst(CASLoginProtocol.TARGET_PARAM);
+            isSaml11Request = true;
+        }
         boolean renew = params.containsKey(CASLoginProtocol.RENEW_PARAM);
         boolean gateway = params.containsKey(CASLoginProtocol.GATEWAY_PARAM);
 
@@ -46,10 +52,17 @@
         updateAuthenticationSession();
 
         // So back button doesn't work
-        CacheControlUtil.noBackButtonCacheControlHeader();
+        CacheControlUtil.noBackButtonCacheControlHeader(session);
 
         if (renew) {
             authenticationSession.setClientNote(CASLoginProtocol.RENEW_PARAM, "true");
+        }
+        if (gateway) {
+            authenticationSession.setClientNote(CASLoginProtocol.GATEWAY_PARAM, "true");
+        }
+        if (isSaml11Request) {
+            // Flag the session so we can return the ticket as "SAMLart" in the response
+            authenticationSession.setClientNote(CASLoginProtocol.TARGET_PARAM, "true");
         }
 
         this.event.event(EventType.LOGIN);
@@ -62,7 +75,9 @@
             throw new ErrorPageException(session, Response.Status.BAD_REQUEST, Messages.MISSING_PARAMETER, CASLoginProtocol.SERVICE_PARAM);
         }
 
-        client = realm.getClients().stream()
+        event.detail(Details.REDIRECT_URI, service);
+
+        client = realm.getClientsStream()
                 .filter(c -> CASLoginProtocol.LOGIN_PROTOCOL.equals(c.getProtocol()))
                 .filter(c -> RedirectUtils.verifyRedirectUri(session, service, c) != null)
                 .findFirst().orElse(null);

--
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