package org.keycloak.protocol.cas.endpoints;
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import jakarta.ws.rs.core.Response;
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import org.jboss.logging.Logger;
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import org.keycloak.events.Details;
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import org.keycloak.events.Errors;
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import org.keycloak.events.EventBuilder;
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import org.keycloak.common.util.Time;
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import org.keycloak.models.*;
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import org.keycloak.protocol.ProtocolMapper;
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import org.keycloak.protocol.cas.CASLoginProtocol;
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import org.keycloak.protocol.cas.mappers.CASAttributeMapper;
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import org.keycloak.protocol.cas.representations.CASErrorCode;
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import org.keycloak.protocol.cas.utils.CASValidationException;
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import org.keycloak.protocol.oidc.utils.OAuth2Code;
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import org.keycloak.protocol.oidc.utils.RedirectUtils;
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import org.keycloak.services.managers.AuthenticationManager;
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import org.keycloak.services.managers.UserSessionCrossDCManager;
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import org.keycloak.services.util.DefaultClientSessionContext;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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import java.util.UUID;
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import java.util.regex.Pattern;
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import java.util.stream.Collectors;
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import org.apache.http.client.utils.URIBuilder;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.HttpResponse;
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import org.apache.http.impl.client.HttpClientBuilder;
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public abstract class AbstractValidateEndpoint {
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protected final Logger logger = Logger.getLogger(getClass());
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private static final Pattern DOT = Pattern.compile("\\.");
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protected KeycloakSession session;
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protected RealmModel realm;
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protected EventBuilder event;
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protected ClientModel client;
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protected AuthenticatedClientSessionModel clientSession;
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protected String pgtIou;
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public AbstractValidateEndpoint(KeycloakSession session, RealmModel realm, EventBuilder event) {
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this.session = session;
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this.realm = realm;
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this.event = event;
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}
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protected void checkSsl() {
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if (!session.getContext().getUri().getBaseUri().getScheme().equals("https") && realm.getSslRequired().isRequired(session.getContext().getConnection())) {
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throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "HTTPS required", Response.Status.FORBIDDEN);
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}
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}
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protected void checkRealm() {
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if (!realm.isEnabled()) {
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throw new CASValidationException(CASErrorCode.INTERNAL_ERROR, "Realm not enabled", Response.Status.FORBIDDEN);
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}
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}
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protected void checkClient(String service) {
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if (service == null) {
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event.error(Errors.INVALID_REQUEST);
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throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "Missing parameter: " + CASLoginProtocol.SERVICE_PARAM, Response.Status.BAD_REQUEST);
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}
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event.detail(Details.REDIRECT_URI, service);
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client = realm.getClientsStream()
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.filter(c -> CASLoginProtocol.LOGIN_PROTOCOL.equals(c.getProtocol()))
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.filter(c -> RedirectUtils.verifyRedirectUri(session, service, c) != null)
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.findFirst().orElse(null);
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if (client == null) {
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event.error(Errors.CLIENT_NOT_FOUND);
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throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Client not found", Response.Status.BAD_REQUEST);
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}
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if (!client.isEnabled()) {
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event.error(Errors.CLIENT_DISABLED);
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throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Client disabled", Response.Status.BAD_REQUEST);
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}
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event.client(client.getClientId());
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session.getContext().setClient(client);
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}
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protected void checkTicket(String ticket, String prefix, boolean requireReauth) {
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if (ticket == null) {
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event.error(Errors.INVALID_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_REQUEST, "Missing parameter: " + CASLoginProtocol.TICKET_PARAM, Response.Status.BAD_REQUEST);
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}
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if (!ticket.startsWith(prefix)) {
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event.error(Errors.INVALID_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET_SPEC, "Malformed service ticket", Response.Status.BAD_REQUEST);
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}
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boolean isReusable = ticket.startsWith(CASLoginProtocol.PROXY_GRANTING_TICKET_PREFIX);
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String[] parsed = DOT.split(ticket.substring(prefix.length()), 3);
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if (parsed.length != 3) {
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event.error(Errors.INVALID_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET_SPEC, "Invalid format of the code", Response.Status.BAD_REQUEST);
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}
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String userSessionId = parsed[1];
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String clientUUID = parsed[2];
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event.detail(Details.CODE_ID, userSessionId);
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event.session(userSessionId);
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// Parse UUID
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String codeUUID;
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try {
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codeUUID = parsed[0];
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} catch (IllegalArgumentException re) {
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event.error(Errors.INVALID_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET_SPEC, "Invalid format of the UUID in the code", Response.Status.BAD_REQUEST);
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}
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// Retrieve UserSession
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UserSessionModel userSession = new UserSessionCrossDCManager(session).getUserSessionWithClient(realm, userSessionId, clientUUID);
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if (userSession == null) {
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// Needed to track if code is invalid
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userSession = session.sessions().getUserSession(realm, userSessionId);
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if (userSession == null) {
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event.error(Errors.USER_SESSION_NOT_FOUND);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User session not found", Response.Status.BAD_REQUEST);
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}
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}
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clientSession = userSession.getAuthenticatedClientSessionByClient(clientUUID);
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if (clientSession == null) {
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code not valid", Response.Status.BAD_REQUEST);
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}
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SingleUseObjectProvider codeStore = session.singleUseObjects();
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Map<String, String> codeDataSerialized = isReusable ? codeStore.get(prefix + codeUUID) : codeStore.remove(prefix + codeUUID);
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// Either code not available
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if (codeDataSerialized == null) {
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code already used", Response.Status.BAD_REQUEST);
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}
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OAuth2Code codeData = OAuth2Code.deserializeCode(codeDataSerialized);
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String persistedUserSessionId = codeData.getUserSessionId();
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if (!userSessionId.equals(persistedUserSessionId)) {
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code "+codeUUID+"' is bound to a different session", Response.Status.BAD_REQUEST);
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}
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// Finally doublecheck if code is not expired
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int currentTime = Time.currentTime();
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if (currentTime > codeData.getExpiration()) {
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event.error(Errors.EXPIRED_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code is expired", Response.Status.BAD_REQUEST);
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}
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clientSession.setNote(prefix, ticket);
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if (requireReauth && AuthenticationManager.isSSOAuthentication(clientSession)) {
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event.error(Errors.SESSION_EXPIRED);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Interactive authentication was requested but not performed", Response.Status.BAD_REQUEST);
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}
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UserModel user = userSession.getUser();
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if (user == null) {
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event.error(Errors.USER_NOT_FOUND);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User not found", Response.Status.BAD_REQUEST);
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}
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if (!user.isEnabled()) {
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event.error(Errors.USER_DISABLED);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "User disabled", Response.Status.BAD_REQUEST);
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}
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event.user(userSession.getUser());
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event.session(userSession.getId());
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if (client == null) {
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client = clientSession.getClient();
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} else {
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if (!client.getClientId().equals(clientSession.getClient().getClientId())) {
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event.error(Errors.INVALID_CODE);
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throw new CASValidationException(CASErrorCode.INVALID_SERVICE, "Auth error", Response.Status.BAD_REQUEST);
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}
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}
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if (!AuthenticationManager.isSessionValid(realm, userSession)) {
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event.error(Errors.USER_SESSION_NOT_FOUND);
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throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Session not active", Response.Status.BAD_REQUEST);
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}
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}
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protected void createProxyGrant(String pgtUrl) {
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if ( RedirectUtils.verifyRedirectUri(session, pgtUrl, client) == null ) {
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event.error(Errors.INVALID_REQUEST);
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throw new CASValidationException(CASErrorCode.INVALID_PROXY_CALLBACK, "Proxy callback is invalid", Response.Status.BAD_REQUEST);
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}
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String pgtIou = getPGTIOU();
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String pgtId = getPGT(session, clientSession, pgtUrl);
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try {
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HttpResponse response = HttpClientBuilder.create().build().execute(
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new HttpGet(new URIBuilder(pgtUrl).setParameter("pgtIou",pgtIou).setParameter("pgtId",pgtId).build())
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);
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if (response.getStatusLine().getStatusCode() != 200) {
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throw new Exception();
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}
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this.pgtIou = pgtIou;
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} catch (Exception e) {
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event.error(Errors.INVALID_REQUEST);
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throw new CASValidationException(CASErrorCode.PROXY_CALLBACK_ERROR, "Proxy callback return with error", Response.Status.BAD_REQUEST);
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}
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}
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protected Map<String, Object> getUserAttributes() {
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UserSessionModel userSession = clientSession.getUserSession();
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// CAS protocol does not support scopes, so pass null scopeParam
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ClientSessionContext clientSessionCtx = DefaultClientSessionContext.fromClientSessionAndScopeParameter(clientSession, null, session);
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Set<ProtocolMapperModel> mappings = clientSessionCtx.getProtocolMappersStream().collect(Collectors.toSet());
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KeycloakSessionFactory sessionFactory = session.getKeycloakSessionFactory();
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Map<String, Object> attributes = new HashMap<>();
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for (ProtocolMapperModel mapping : mappings) {
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ProtocolMapper mapper = (ProtocolMapper) sessionFactory.getProviderFactory(ProtocolMapper.class, mapping.getProtocolMapper());
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if (mapper instanceof CASAttributeMapper) {
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((CASAttributeMapper) mapper).setAttribute(attributes, mapping, userSession, session, clientSessionCtx);
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}
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}
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return attributes;
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}
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protected String getPGTIOU()
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{
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return CASLoginProtocol.PROXY_GRANTING_TICKET_IOU_PREFIX + UUID.randomUUID().toString();
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}
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protected String getPGT(KeycloakSession session, AuthenticatedClientSessionModel clientSession, String pgtUrl)
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{
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return persistedTicket(pgtUrl, CASLoginProtocol.PROXY_GRANTING_TICKET_PREFIX);
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}
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protected String getPT(KeycloakSession session, AuthenticatedClientSessionModel clientSession, String targetService)
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{
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return persistedTicket(targetService, CASLoginProtocol.PROXY_TICKET_PREFIX);
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}
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protected String getST(String redirectUri)
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{
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return persistedTicket(redirectUri, CASLoginProtocol.SERVICE_TICKET_PREFIX);
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}
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public static String getST(KeycloakSession session, AuthenticatedClientSessionModel clientSession, String redirectUri)
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{
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ValidateEndpoint vp = new ValidateEndpoint(session,null,null);
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vp.clientSession = clientSession;
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return vp.getST(redirectUri);
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}
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protected String persistedTicket(String redirectUriParam, String prefix)
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{
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String key = UUID.randomUUID().toString();
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UserSessionModel userSession = clientSession.getUserSession();
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OAuth2Code codeData = new OAuth2Code(key, Time.currentTime() + userSession.getRealm().getAccessCodeLifespan(), null, null, redirectUriParam, null, null, userSession.getId());
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session.singleUseObjects().put(prefix + key, clientSession.getUserSession().getRealm().getAccessCodeLifespan(), codeData.serializeCode());
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return prefix + key + "." + clientSession.getUserSession().getId() + "." + clientSession.getClient().getId();
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}
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}
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