From bba8bfec21d26bc06fe25a3b2ecb827b80fc0fb1 Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <Jacek@jacekk.info>
Date: Wed, 28 Jun 2023 10:55:12 +0000
Subject: [PATCH] GitHub Actions: add "contents: write" permission for update-deps job

---
 src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java |  107 +++++++++++++++++++++++++++++++++++++++++++----------
 1 files changed, 87 insertions(+), 20 deletions(-)

diff --git a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java b/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
index 10c9b5d..0317f0d 100644
--- a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
+++ b/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
@@ -1,45 +1,61 @@
 package org.keycloak.protocol.cas;
 
+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.services.managers.ClientSessionCode;
+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 javax.ws.rs.core.HttpHeaders;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.UriInfo;
+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);
+
     public static final String LOGIN_PROTOCOL = "cas";
 
     public static final String SERVICE_PARAM = "service";
+    public static final String TARGET_PARAM = "TARGET";
     public static final String RENEW_PARAM = "renew";
     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 TICKET_RESPONSE_PARAM = "ticket";
+    public static final String SAMLART_RESPONSE_PARAM = "SAMLart";
 
     public static final String SERVICE_TICKET_PREFIX = "ST-";
+    public static final String SESSION_SERVICE_TICKET = "service_ticket";
+
+    public static final String LOGOUT_REDIRECT_URI = "CAS_LOGOUT_REDIRECT_URI";
 
     protected KeycloakSession session;
     protected RealmModel realm;
     protected UriInfo uriInfo;
     protected HttpHeaders headers;
     protected EventBuilder event;
-    private boolean requireReauth;
 
-    public CASLoginProtocol(KeycloakSession session, RealmModel realm, UriInfo uriInfo, HttpHeaders headers, EventBuilder event, boolean requireReauth) {
+    public CASLoginProtocol(KeycloakSession session, RealmModel realm, UriInfo uriInfo, HttpHeaders headers, EventBuilder event) {
         this.session = session;
         this.realm = realm;
         this.uriInfo = uriInfo;
         this.headers = headers;
         this.event = event;
-        this.requireReauth = requireReauth;
     }
 
     public CASLoginProtocol() {
@@ -76,14 +92,28 @@
     }
 
     @Override
-    public Response authenticated(UserSessionModel userSession, ClientSessionCode accessCode) {
-        ClientSessionModel clientSession = accessCode.getClientSession();
+    public Response authenticated(AuthenticationSessionModel authSession, UserSessionModel userSession, ClientSessionContext clientSessionCtx) {
+        AuthenticatedClientSessionModel clientSession = clientSessionCtx.getClientSession();
 
-        String service = clientSession.getRedirectUri();
+        String service = authSession.getRedirectUri();
         //TODO validate service
-        accessCode.setAction(ClientSessionModel.Action.CODE_TO_TOKEN.name());
+
+        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);
-        uriBuilder.queryParam(TICKET_RESPONSE_PARAM, SERVICE_TICKET_PREFIX + accessCode.getCode());
+
+        String loginTicket = SERVICE_TICKET_PREFIX + code;
+
+        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"
+            uriBuilder.queryParam(SAMLART_RESPONSE_PARAM, loginTicket);
+        } else {
+            uriBuilder.queryParam(TICKET_RESPONSE_PARAM, loginTicket);
+        }
 
         URI redirectUri = uriBuilder.build();
 
@@ -92,32 +122,69 @@
     }
 
     @Override
-    public Response sendError(ClientSessionModel clientSession, Error error) {
-        return Response.serverError().entity(error).build();
+    public Response sendError(AuthenticationSessionModel authSession, Error error) {
+        if (authSession.getClientNotes().containsKey(CASLoginProtocol.GATEWAY_PARAM)) {
+            if (error == Error.PASSIVE_INTERACTION_REQUIRED || error == Error.PASSIVE_LOGIN_REQUIRED) {
+                return Response.status(302).location(URI.create(authSession.getRedirectUri())).build();
+            }
+        }
+        return ErrorPage.error(session, authSession, Response.Status.INTERNAL_SERVER_ERROR, error.name());
     }
 
     @Override
-    public void backchannelLogout(UserSessionModel userSession, ClientSessionModel clientSession) {
+    public Response backchannelLogout(UserSessionModel userSession, AuthenticatedClientSessionModel clientSession) {
+        String logoutUrl = clientSession.getRedirectUri();
+        String serviceTicket = clientSession.getNote(CASLoginProtocol.SESSION_SERVICE_TICKET);
+        //check if session is fully authenticated (i.e. serviceValidate has been called)
+        if (serviceTicket != null && !serviceTicket.isEmpty()) {
+            sendSingleLogoutRequest(logoutUrl, serviceTicket);
+        }
         ClientModel client = clientSession.getClient();
-        new ResourceAdminManager(session).logoutClientSession(uriInfo.getRequestUri(), realm, client, clientSession);
+        new ResourceAdminManager(session).logoutClientSession(realm, client, clientSession);
+        return Response.ok().build();
+    }
+
+    private void sendSingleLogoutRequest(String logoutUrl, String serviceTicket) {
+        try {
+            HttpEntity requestEntity = LogoutHelper.buildSingleLogoutRequest(serviceTicket);
+            LogoutHelper.postWithRedirect(session, logoutUrl, requestEntity);
+            logger.debug("Sent CAS single logout for service " + logoutUrl);
+        } catch (IOException e) {
+            logger.warn("Failed to call CAS service for logout: " + logoutUrl, e);
+        }
     }
 
     @Override
-    public Response frontchannelLogout(UserSessionModel userSession, ClientSessionModel clientSession) {
+    public Response frontchannelLogout(UserSessionModel userSession, AuthenticatedClientSessionModel clientSession) {
         // todo oidc redirect support
         throw new RuntimeException("NOT IMPLEMENTED");
     }
 
     @Override
-    public Response finishLogout(UserSessionModel userSession) {
-        event.event(EventType.LOGOUT);
-        event.user(userSession.getUser()).session(userSession).success();
-        return Response.ok().build();
+    public Response finishBrowserLogout(UserSessionModel userSession, AuthenticationSessionModel logoutSession) {
+        String redirectUri = userSession.getNote(CASLoginProtocol.LOGOUT_REDIRECT_URI);
+
+        event.event(EventType.LOGOUT)
+            .user(userSession.getUser())
+            .session(userSession)
+            .detail(Details.USERNAME, userSession.getUser().getUsername());
+
+        if (redirectUri != null) {
+            event.detail(Details.REDIRECT_URI, redirectUri);
+            event.success();
+            return Response.status(302).location(URI.create(redirectUri)).build();
+        }
+
+        event.success();
+
+        LoginFormsProvider infoPage = session.getProvider(LoginFormsProvider.class).setSuccess("Logout successful");
+        infoPage.setAttribute("skipLink", true);
+        return infoPage.createInfoPage();
     }
 
     @Override
-    public boolean requireReauthentication(UserSessionModel userSession, ClientSessionModel clientSession) {
-        return requireReauth;
+    public boolean requireReauthentication(UserSessionModel userSession, AuthenticationSessionModel authSession) {
+        return "true".equals(authSession.getClientNote(CASLoginProtocol.RENEW_PARAM));
     }
 
     @Override

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