package org.keycloak.protocol.cas;
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import jakarta.ws.rs.core.HttpHeaders;
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import jakarta.ws.rs.core.Response;
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import jakarta.ws.rs.core.UriInfo;
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import org.apache.http.HttpEntity;
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import org.jboss.logging.Logger;
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import org.keycloak.common.util.KeycloakUriBuilder;
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import org.keycloak.common.util.Time;
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import org.keycloak.events.Details;
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import org.keycloak.events.EventBuilder;
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import org.keycloak.events.EventType;
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import org.keycloak.forms.login.LoginFormsProvider;
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import org.keycloak.models.*;
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import org.keycloak.protocol.LoginProtocol;
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import org.keycloak.protocol.cas.utils.LogoutHelper;
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import org.keycloak.protocol.oidc.utils.OAuth2Code;
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import org.keycloak.protocol.oidc.utils.OAuth2CodeParser;
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import org.keycloak.services.ErrorPage;
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import org.keycloak.services.managers.ResourceAdminManager;
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import org.keycloak.sessions.AuthenticationSessionModel;
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import java.io.IOException;
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import java.net.URI;
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import java.util.UUID;
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public class CASLoginProtocol implements LoginProtocol {
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private static final Logger logger = Logger.getLogger(CASLoginProtocol.class);
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public static final String LOGIN_PROTOCOL = "cas";
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public static final String SERVICE_PARAM = "service";
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public static final String TARGET_PARAM = "TARGET";
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public static final String RENEW_PARAM = "renew";
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public static final String GATEWAY_PARAM = "gateway";
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public static final String TICKET_PARAM = "ticket";
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public static final String FORMAT_PARAM = "format";
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public static final String TICKET_RESPONSE_PARAM = "ticket";
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public static final String SAMLART_RESPONSE_PARAM = "SAMLart";
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public static final String SERVICE_TICKET_PREFIX = "ST-";
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public static final String SESSION_SERVICE_TICKET = "service_ticket";
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public static final String LOGOUT_REDIRECT_URI = "CAS_LOGOUT_REDIRECT_URI";
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protected KeycloakSession session;
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protected RealmModel realm;
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protected UriInfo uriInfo;
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protected HttpHeaders headers;
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protected EventBuilder event;
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public CASLoginProtocol(KeycloakSession session, RealmModel realm, UriInfo uriInfo, HttpHeaders headers, EventBuilder event) {
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this.session = session;
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this.realm = realm;
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this.uriInfo = uriInfo;
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this.headers = headers;
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this.event = event;
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}
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public CASLoginProtocol() {
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}
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@Override
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public CASLoginProtocol setSession(KeycloakSession session) {
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this.session = session;
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return this;
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}
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@Override
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public CASLoginProtocol setRealm(RealmModel realm) {
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this.realm = realm;
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return this;
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}
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@Override
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public CASLoginProtocol setUriInfo(UriInfo uriInfo) {
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this.uriInfo = uriInfo;
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return this;
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}
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@Override
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public CASLoginProtocol setHttpHeaders(HttpHeaders headers) {
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this.headers = headers;
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return this;
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}
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@Override
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public CASLoginProtocol setEventBuilder(EventBuilder event) {
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this.event = event;
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return this;
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}
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@Override
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public Response authenticated(AuthenticationSessionModel authSession, UserSessionModel userSession, ClientSessionContext clientSessionCtx) {
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AuthenticatedClientSessionModel clientSession = clientSessionCtx.getClientSession();
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String service = authSession.getRedirectUri();
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//TODO validate service
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OAuth2Code codeData = new OAuth2Code(UUID.randomUUID().toString(),
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Time.currentTime() + userSession.getRealm().getAccessCodeLifespan(),
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null, null, authSession.getRedirectUri(), null, null,
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userSession.getId());
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String code = OAuth2CodeParser.persistCode(session, clientSession, codeData);
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KeycloakUriBuilder uriBuilder = KeycloakUriBuilder.fromUri(service);
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String loginTicket = SERVICE_TICKET_PREFIX + code;
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if (authSession.getClientNotes().containsKey(CASLoginProtocol.TARGET_PARAM)) {
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// This was a SAML 1.1 auth request so return the ticket ID as "SAMLart" instead of "ticket"
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uriBuilder.queryParam(SAMLART_RESPONSE_PARAM, loginTicket);
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} else {
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uriBuilder.queryParam(TICKET_RESPONSE_PARAM, loginTicket);
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}
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URI redirectUri = uriBuilder.build();
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Response.ResponseBuilder location = Response.status(302).location(redirectUri);
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return location.build();
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}
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@Override
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public Response sendError(AuthenticationSessionModel authSession, Error error) {
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if (authSession.getClientNotes().containsKey(CASLoginProtocol.GATEWAY_PARAM)) {
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if (error == Error.PASSIVE_INTERACTION_REQUIRED || error == Error.PASSIVE_LOGIN_REQUIRED) {
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return Response.status(302).location(URI.create(authSession.getRedirectUri())).build();
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}
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}
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return ErrorPage.error(session, authSession, Response.Status.INTERNAL_SERVER_ERROR, error.name());
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}
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@Override
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public Response backchannelLogout(UserSessionModel userSession, AuthenticatedClientSessionModel clientSession) {
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String logoutUrl = clientSession.getRedirectUri();
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String serviceTicket = clientSession.getNote(CASLoginProtocol.SESSION_SERVICE_TICKET);
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//check if session is fully authenticated (i.e. serviceValidate has been called)
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if (serviceTicket != null && !serviceTicket.isEmpty()) {
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sendSingleLogoutRequest(logoutUrl, serviceTicket);
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}
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ClientModel client = clientSession.getClient();
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new ResourceAdminManager(session).logoutClientSession(realm, client, clientSession);
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return Response.ok().build();
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}
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private void sendSingleLogoutRequest(String logoutUrl, String serviceTicket) {
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try {
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HttpEntity requestEntity = LogoutHelper.buildSingleLogoutRequest(serviceTicket);
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LogoutHelper.postWithRedirect(session, logoutUrl, requestEntity);
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logger.debug("Sent CAS single logout for service " + logoutUrl);
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} catch (IOException e) {
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logger.warn("Failed to call CAS service for logout: " + logoutUrl, e);
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}
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}
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@Override
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public Response frontchannelLogout(UserSessionModel userSession, AuthenticatedClientSessionModel clientSession) {
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// todo oidc redirect support
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throw new RuntimeException("NOT IMPLEMENTED");
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}
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@Override
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public Response finishBrowserLogout(UserSessionModel userSession, AuthenticationSessionModel logoutSession) {
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String redirectUri = userSession.getNote(CASLoginProtocol.LOGOUT_REDIRECT_URI);
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event.event(EventType.LOGOUT)
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.user(userSession.getUser())
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.session(userSession)
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.detail(Details.USERNAME, userSession.getUser().getUsername());
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if (redirectUri != null) {
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event.detail(Details.REDIRECT_URI, redirectUri);
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event.success();
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return Response.status(302).location(URI.create(redirectUri)).build();
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}
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event.success();
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LoginFormsProvider infoPage = session.getProvider(LoginFormsProvider.class).setSuccess("Logout successful");
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infoPage.setAttribute("skipLink", true);
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return infoPage.createInfoPage();
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}
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@Override
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public boolean requireReauthentication(UserSessionModel userSession, AuthenticationSessionModel authSession) {
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return "true".equals(authSession.getClientNote(CASLoginProtocol.RENEW_PARAM));
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}
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@Override
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public void close() {
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}
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}
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