From 3c9bdbd63e0f335e2aa17f640c3afdfa8d541a9a Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <Jacek@jacekk.info>
Date: Tue, 03 Nov 2026 20:58:49 +0000
Subject: [PATCH] Verify target service when issuing proxy tickets
---
src/main/java/org/keycloak/protocol/cas/endpoints/ProxyEndpoint.java | 21 ++++++++++++++++++++-
src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java | 12 ++++++++----
2 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java b/src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java
index 33f5ac0..afc9c2c 100644
--- a/src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java
+++ b/src/main/java/org/keycloak/protocol/cas/endpoints/AbstractValidateEndpoint.java
@@ -70,10 +70,7 @@
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);
+ client = findClient(service);
if (client == null) {
event.error(Errors.CLIENT_NOT_FOUND);
throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Client not found", Response.Status.BAD_REQUEST);
@@ -91,6 +88,13 @@
session.getContext().setClient(client);
}
+ protected ClientModel findClient(String service) {
+ return realm.getClientsStream()
+ .filter(c -> CASLoginProtocol.LOGIN_PROTOCOL.equals(c.getProtocol()))
+ .filter(c -> RedirectUtils.verifyRedirectUri(session, service, c) != null)
+ .findFirst().orElse(null);
+ }
+
protected void checkTicket(String ticket, String prefix, boolean requireReauth) {
if (ticket == null) {
event.error(Errors.INVALID_CODE);
diff --git a/src/main/java/org/keycloak/protocol/cas/endpoints/ProxyEndpoint.java b/src/main/java/org/keycloak/protocol/cas/endpoints/ProxyEndpoint.java
index 41f81e0..82fb36d 100644
--- a/src/main/java/org/keycloak/protocol/cas/endpoints/ProxyEndpoint.java
+++ b/src/main/java/org/keycloak/protocol/cas/endpoints/ProxyEndpoint.java
@@ -5,12 +5,15 @@
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.core.Response;
import org.jboss.resteasy.annotations.cache.NoCache;
+import org.keycloak.events.Errors;
import org.keycloak.events.EventBuilder;
import org.keycloak.events.EventType;
import org.keycloak.models.*;
import org.keycloak.protocol.cas.CASLoginProtocol;
+import org.keycloak.protocol.cas.representations.CASErrorCode;
import org.keycloak.protocol.cas.representations.CASServiceResponse;
import org.keycloak.protocol.cas.utils.CASValidationException;
+import org.keycloak.protocol.cas.utils.RedirectUtils;
import org.keycloak.protocol.cas.utils.ContentTypeHelper;
import org.keycloak.protocol.cas.utils.ServiceResponseHelper;
@@ -33,13 +36,29 @@
checkSsl();
checkRealm();
checkTicket(pgt, CASLoginProtocol.PROXY_GRANTING_TICKET_PREFIX, false);
+ String verifiedTargetService = checkTargetService(targetService);
event.success();
- return successResponse(getPT(this.session, clientSession, targetService));
+ return successResponse(getPT(this.session, clientSession, verifiedTargetService));
} catch (CASValidationException e) {
return errorResponse(e);
}
}
+ private String checkTargetService(String targetService) {
+ if (targetService == null) {
+ event.error(Errors.INVALID_REQUEST);
+ throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "Missing parameter: " + CASLoginProtocol.TARGET_SERVICE_PARAM, Response.Status.BAD_REQUEST);
+ }
+
+ ClientModel targetClient = findClient(targetService);
+ if (targetClient == null || !targetClient.isEnabled()) {
+ event.error(Errors.CLIENT_NOT_FOUND);
+ throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Target service not allowed", Response.Status.BAD_REQUEST);
+ }
+
+ return RedirectUtils.verifyRedirectUri(session, targetService, targetClient);
+ }
+
protected Response successResponse(String pt) {
CASServiceResponse serviceResponse = ServiceResponseHelper.createProxySuccess(pt);
return prepare(Response.Status.OK, serviceResponse);
--
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