From cbb2f2f81452a97fddbdcc1f6010fbc85682e3b3 Mon Sep 17 00:00:00 2001
From: Erlend Hamnaberg <erlend@hamnaberg.net>
Date: Thu, 29 Nov 2018 07:42:20 +0000
Subject: [PATCH] Redirect to application after login is complete

---
 src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java |   97 +++++++++++++++++++++++++-----------------------
 1 files changed, 50 insertions(+), 47 deletions(-)

diff --git a/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java b/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java
index 5727b50..9e84f0c 100644
--- a/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java
+++ b/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java
@@ -3,7 +3,6 @@
 import org.jboss.logging.Logger;
 import org.jboss.resteasy.annotations.cache.NoCache;
 import org.jboss.resteasy.spi.HttpRequest;
-import org.keycloak.OAuthErrorException;
 import org.keycloak.common.ClientConnection;
 import org.keycloak.events.Details;
 import org.keycloak.events.Errors;
@@ -11,18 +10,17 @@
 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.utils.CASValidationException;
 import org.keycloak.protocol.oidc.utils.RedirectUtils;
-import org.keycloak.services.ErrorPageException;
-import org.keycloak.services.ErrorResponseException;
 import org.keycloak.services.managers.AuthenticationManager;
 import org.keycloak.services.managers.ClientSessionCode;
-import org.keycloak.services.messages.Messages;
 
 import javax.ws.rs.GET;
 import javax.ws.rs.core.*;
 
 public class ValidateEndpoint {
-    protected static final Logger logger = Logger.getLogger(org.keycloak.protocol.oidc.endpoints.LogoutEndpoint.class);
+    protected static final Logger logger = Logger.getLogger(ValidateEndpoint.class);
 
     private static final String RESPONSE_OK = "yes\n";
     private static final String RESPONSE_FAILED = "no\n";
@@ -39,13 +37,10 @@
     @Context
     protected HttpHeaders headers;
 
-    @Context
-    protected UriInfo uriInfo;
-
     protected RealmModel realm;
     protected EventBuilder event;
     protected ClientModel client;
-    protected ClientSessionModel clientSession;
+    protected AuthenticatedClientSessionModel clientSession;
 
     public ValidateEndpoint(RealmModel realm, EventBuilder event) {
         this.realm = realm;
@@ -55,10 +50,10 @@
     @GET
     @NoCache
     public Response build() {
-        MultivaluedMap<String, String> params = uriInfo.getQueryParameters();
+        MultivaluedMap<String, String> params = session.getContext().getUri().getQueryParameters();
         String service = params.getFirst(CASLoginProtocol.SERVICE_PARAM);
         String ticket = params.getFirst(CASLoginProtocol.TICKET_PARAM);
-        boolean renew = "true".equalsIgnoreCase(params.getFirst(CASLoginProtocol.RENEW_PARAM));
+        boolean renew = params.containsKey(CASLoginProtocol.RENEW_PARAM);
 
         event.event(EventType.CODE_TO_TOKEN);
 
@@ -71,7 +66,7 @@
 
             event.success();
             return successResponse();
-        } catch (ErrorResponseException e) {
+        } catch (CASValidationException e) {
             return errorResponse(e);
         }
     }
@@ -80,45 +75,40 @@
         return Response.ok(RESPONSE_OK).type(MediaType.TEXT_PLAIN).build();
     }
 
-    protected Response errorResponse(ErrorResponseException e) {
-        return Response.status(Response.Status.UNAUTHORIZED).entity(RESPONSE_FAILED).type(MediaType.TEXT_PLAIN).build();
+    protected Response errorResponse(CASValidationException e) {
+        return Response.status(e.getStatus()).entity(RESPONSE_FAILED).type(MediaType.TEXT_PLAIN).build();
     }
 
     private void checkSsl() {
-        if (!uriInfo.getBaseUri().getScheme().equals("https") && realm.getSslRequired().isRequired(clientConnection)) {
-            throw new ErrorResponseException(OAuthErrorException.INVALID_REQUEST, "HTTPS required", Response.Status.FORBIDDEN);
+        if (!session.getContext().getUri().getBaseUri().getScheme().equals("https") && realm.getSslRequired().isRequired(clientConnection)) {
+            throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "HTTPS required", Response.Status.FORBIDDEN);
         }
     }
 
     private void checkRealm() {
         if (!realm.isEnabled()) {
-            throw new ErrorResponseException("access_denied", "Realm not enabled", Response.Status.FORBIDDEN);
+            throw new CASValidationException(CASErrorCode.INTERNAL_ERROR, "Realm not enabled", Response.Status.FORBIDDEN);
         }
     }
 
     private void checkClient(String service) {
         if (service == null) {
             event.error(Errors.INVALID_REQUEST);
-            throw new ErrorPageException(session, Messages.MISSING_PARAMETER, CASLoginProtocol.SERVICE_PARAM);
+            throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "Missing parameter: " + CASLoginProtocol.SERVICE_PARAM, Response.Status.BAD_REQUEST);
         }
 
         client = realm.getClients().stream()
                 .filter(c -> CASLoginProtocol.LOGIN_PROTOCOL.equals(c.getProtocol()))
-                .filter(c -> RedirectUtils.verifyRedirectUri(uriInfo, service, realm, c) != null)
+                .filter(c -> RedirectUtils.verifyRedirectUri(session.getContext().getUri(), service, realm, c) != null)
                 .findFirst().orElse(null);
         if (client == null) {
             event.error(Errors.CLIENT_NOT_FOUND);
-            throw new ErrorPageException(session, Messages.CLIENT_NOT_FOUND);
+            throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Client not found", Response.Status.BAD_REQUEST);
         }
 
         if (!client.isEnabled()) {
             event.error(Errors.CLIENT_DISABLED);
-            throw new ErrorPageException(session, Messages.CLIENT_DISABLED);
-        }
-
-        if (client.isBearerOnly()) {
-            event.error(Errors.NOT_ALLOWED);
-            throw new ErrorPageException(session, Messages.BEARER_ONLY);
+            throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Client disabled", Response.Status.BAD_REQUEST);
         }
 
         event.client(client.getClientId());
@@ -127,51 +117,64 @@
     }
 
     private void checkTicket(String ticket, boolean requireReauth) {
-        if (ticket == null || !ticket.startsWith(CASLoginProtocol.SERVICE_TICKET_PREFIX)) {
+        if (ticket == null) {
             event.error(Errors.INVALID_CODE);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_REQUEST, "Missing or invalid parameter: " + CASLoginProtocol.TICKET_PARAM, Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "Missing parameter: " + CASLoginProtocol.TICKET_PARAM, Response.Status.BAD_REQUEST);
+        }
+        if (!ticket.startsWith(CASLoginProtocol.SERVICE_TICKET_PREFIX)) {
+            event.error(Errors.INVALID_CODE);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET_SPEC, "Malformed service ticket", Response.Status.BAD_REQUEST);
         }
 
         String code = ticket.substring(CASLoginProtocol.SERVICE_TICKET_PREFIX.length());
 
-        ClientSessionCode.ParseResult parseResult = ClientSessionCode.parseResult(code, session, realm);
-        if (parseResult.isClientSessionNotFound() || parseResult.isIllegalHash()) {
-            String[] parts = code.split("\\.");
-            if (parts.length == 2) {
-                event.detail(Details.CODE_ID, parts[1]);
-            }
+        String[] parts = code.split("\\.");
+        if (parts.length == 4) {
+            event.detail(Details.CODE_ID, parts[2]);
+        }
+
+        ClientSessionCode.ParseResult<AuthenticatedClientSessionModel> parseResult = ClientSessionCode.parseResult(code, null, session, realm, client, event, AuthenticatedClientSessionModel.class);
+        if (parseResult.isAuthSessionNotFound() || parseResult.isIllegalHash()) {
             event.error(Errors.INVALID_CODE);
-            if (parseResult.getClientSession() != null) {
-                session.sessions().removeClientSession(realm, parseResult.getClientSession());
+
+            // Attempt to use same code twice should invalidate existing clientSession
+            AuthenticatedClientSessionModel clientSession = parseResult.getClientSession();
+            if (clientSession != null) {
+                clientSession.detachFromUserSession();
             }
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "Code not valid", Response.Status.BAD_REQUEST);
+
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code not valid", Response.Status.BAD_REQUEST);
         }
 
         clientSession = parseResult.getClientSession();
-        event.detail(Details.CODE_ID, clientSession.getId());
 
-        if (!parseResult.getCode().isValid(ClientSessionModel.Action.CODE_TO_TOKEN.name(), ClientSessionCode.ActionType.CLIENT)) {
-            event.error(Errors.INVALID_CODE);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "Code is expired", Response.Status.BAD_REQUEST);
+        if (parseResult.isExpiredToken()) {
+            event.error(Errors.EXPIRED_CODE);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code is expired", Response.Status.BAD_REQUEST);
         }
 
-        parseResult.getCode().setAction(null);
+        clientSession.setNote(CASLoginProtocol.SESSION_SERVICE_TICKET, ticket);
+
+        if (requireReauth && AuthenticationManager.isSSOAuthentication(clientSession)) {
+            event.error(Errors.SESSION_EXPIRED);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Interactive authentication was requested but not performed", Response.Status.BAD_REQUEST);
+        }
 
         UserSessionModel userSession = clientSession.getUserSession();
 
         if (userSession == null) {
             event.error(Errors.USER_SESSION_NOT_FOUND);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "User session not found", Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User session not found", Response.Status.BAD_REQUEST);
         }
 
         UserModel user = userSession.getUser();
         if (user == null) {
             event.error(Errors.USER_NOT_FOUND);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "User not found", Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User not found", Response.Status.BAD_REQUEST);
         }
         if (!user.isEnabled()) {
             event.error(Errors.USER_DISABLED);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "User disabled", Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User disabled", Response.Status.BAD_REQUEST);
         }
 
         event.user(userSession.getUser());
@@ -179,12 +182,12 @@
 
         if (!client.getClientId().equals(clientSession.getClient().getClientId())) {
             event.error(Errors.INVALID_CODE);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "Auth error", Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Auth error", Response.Status.BAD_REQUEST);
         }
 
         if (!AuthenticationManager.isSessionValid(realm, userSession)) {
             event.error(Errors.USER_SESSION_NOT_FOUND);
-            throw new ErrorResponseException(OAuthErrorException.INVALID_GRANT, "Session not active", Response.Status.BAD_REQUEST);
+            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Session not active", Response.Status.BAD_REQUEST);
         }
 
     }

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