/*
* Copyright 2014 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @author tags. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.keycloak.adapters.undertow;
import io.undertow.security.api.AuthenticationMechanism;
import io.undertow.security.api.AuthenticationMechanismFactory;
import io.undertow.security.idm.Account;
import io.undertow.security.idm.Credential;
import io.undertow.security.idm.IdentityManager;
import io.undertow.server.handlers.form.FormParserFactory;
import io.undertow.servlet.ServletExtension;
import io.undertow.servlet.api.AuthMethodConfig;
import io.undertow.servlet.api.DeploymentInfo;
import io.undertow.servlet.api.InstanceFactory;
import io.undertow.servlet.api.InstanceHandle;
import io.undertow.servlet.api.ListenerInfo;
import io.undertow.servlet.api.LoginConfig;
import io.undertow.servlet.api.ServletSessionConfig;
import io.undertow.servlet.util.ImmediateInstanceHandle;
import org.jboss.logging.Logger;
import org.keycloak.adapters.AdapterConstants;
import org.keycloak.adapters.AdapterDeploymentContext;
import org.keycloak.adapters.KeycloakDeployment;
import org.keycloak.adapters.KeycloakDeploymentBuilder;
import org.keycloak.adapters.NodesRegistrationManagement;
import javax.servlet.ServletContext;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Map;
import org.keycloak.adapters.KeycloakConfigResolver;
/**
* @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
* @version $Revision: 1 $
*/
public class KeycloakServletExtension implements ServletExtension {
protected static Logger log = Logger.getLogger(KeycloakServletExtension.class);
// todo when this DeploymentInfo method of the same name is fixed.
public boolean isAuthenticationMechanismPresent(DeploymentInfo deploymentInfo, final String mechanismName) {
LoginConfig loginConfig = deploymentInfo.getLoginConfig();
if(loginConfig != null) {
for(AuthMethodConfig method : loginConfig.getAuthMethods()) {
if(method.getName().equalsIgnoreCase(mechanismName)) {
return true;
}
}
}
return false;
}
private static InputStream getJSONFromServletContext(ServletContext servletContext) {
String json = servletContext.getInitParameter(AdapterConstants.AUTH_DATA_PARAM_NAME);
if (json == null) {
return null;
}
return new ByteArrayInputStream(json.getBytes());
}
private static InputStream getConfigInputStream(ServletContext context) {
InputStream is = getJSONFromServletContext(context);
if (is == null) {
String path = context.getInitParameter("keycloak.config.file");
if (path == null) {
log.debug("using /WEB-INF/keycloak.json");
is = context.getResourceAsStream("/WEB-INF/keycloak.json");
} else {
try {
is = new FileInputStream(path);
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
}
}
}
return is;
}
@Override
@SuppressWarnings("UseSpecificCatch")
public void handleDeployment(DeploymentInfo deploymentInfo, ServletContext servletContext) {
if (!isAuthenticationMechanismPresent(deploymentInfo, "KEYCLOAK")) {
log.debug("auth-method is not keycloak!");
return;
}
log.debug("KeycloakServletException initialization");
// Possible scenarios:
// 1) The deployment has a keycloak.config.resolver specified and it exists:
// Outcome: adapter uses the resolver
// 2) The deployment has a keycloak.config.resolver and isn't valid (doesn't exists, isn't a resolver, ...) :
// Outcome: adapter is left unconfigured
// 3) The deployment doesn't have a keycloak.config.resolver , but has a keycloak.json (or equivalent)
// Outcome: adapter uses it
// 4) The deployment doesn't have a keycloak.config.resolver nor keycloak.json (or equivalent)
// Outcome: adapter is left unconfigured
KeycloakConfigResolver configResolver;
String configResolverClass = servletContext.getInitParameter("keycloak.config.resolver");
AdapterDeploymentContext deploymentContext;
if (configResolverClass != null) {
try {
configResolver = (KeycloakConfigResolver) deploymentInfo.getClassLoader().loadClass(configResolverClass).newInstance();
deploymentContext = new AdapterDeploymentContext(configResolver);
log.info("Using " + configResolverClass + " to resolve Keycloak configuration on a per-request basis.");
} catch (Exception ex) {
log.warn("The specified resolver " + configResolverClass + " could NOT be loaded. Keycloak is unconfigured and will deny all requests. Reason: " + ex.getMessage());
deploymentContext = new AdapterDeploymentContext(new KeycloakDeployment());
}
} else {
InputStream is = getConfigInputStream(servletContext);
final KeycloakDeployment deployment;
if (is == null) {
log.warn("No adapter configuration. Keycloak is unconfigured and will deny all requests.");
deployment = new KeycloakDeployment();
} else {
deployment = KeycloakDeploymentBuilder.build(is);
}
deploymentContext = new AdapterDeploymentContext(deployment);
log.debug("Keycloak is using a per-deployment configuration.");
}
servletContext.setAttribute(AdapterDeploymentContext.class.getName(), deploymentContext);
UndertowUserSessionManagement userSessionManagement = new UndertowUserSessionManagement();
final NodesRegistrationManagement nodesRegistrationManagement = new NodesRegistrationManagement();
final ServletKeycloakAuthMech mech = createAuthenticationMechanism(deploymentInfo, deploymentContext, userSessionManagement, nodesRegistrationManagement);
UndertowAuthenticatedActionsHandler.Wrapper actions = new UndertowAuthenticatedActionsHandler.Wrapper(deploymentContext);
// setup handlers
deploymentInfo.addOuterHandlerChainWrapper(new ServletPreAuthActionsHandler.Wrapper(deploymentContext, userSessionManagement));
deploymentInfo.addAuthenticationMechanism("KEYCLOAK", new AuthenticationMechanismFactory() {
@Override
public AuthenticationMechanism create(String s, FormParserFactory formParserFactory, Map<String, String> stringStringMap) {
return mech;
}
}); // authentication
deploymentInfo.addInnerHandlerChainWrapper(actions); // handles authenticated actions and cors.
deploymentInfo.setIdentityManager(new IdentityManager() {
@Override
public Account verify(Account account) {
return account;
}
@Override
public Account verify(String id, Credential credential) {
throw new IllegalStateException("Should never be called in Keycloak flow");
}
@Override
public Account verify(Credential credential) {
throw new IllegalStateException("Should never be called in Keycloak flow");
}
});
log.debug("Setting jsession cookie path to: " + deploymentInfo.getContextPath());
ServletSessionConfig cookieConfig = new ServletSessionConfig();
cookieConfig.setPath(deploymentInfo.getContextPath());
deploymentInfo.setServletSessionConfig(cookieConfig);
deploymentInfo.addListener(new ListenerInfo(UndertowNodesRegistrationManagementWrapper.class, new InstanceFactory<UndertowNodesRegistrationManagementWrapper>() {
@Override
public InstanceHandle<UndertowNodesRegistrationManagementWrapper> createInstance() throws InstantiationException {
UndertowNodesRegistrationManagementWrapper listener = new UndertowNodesRegistrationManagementWrapper(nodesRegistrationManagement);
return new ImmediateInstanceHandle<UndertowNodesRegistrationManagementWrapper>(listener);
}
}));
}
protected ServletKeycloakAuthMech createAuthenticationMechanism(DeploymentInfo deploymentInfo, AdapterDeploymentContext deploymentContext, UndertowUserSessionManagement userSessionManagement,
NodesRegistrationManagement nodesRegistrationManagement) {
log.debug("creating ServletKeycloakAuthMech");
return new ServletKeycloakAuthMech(deploymentContext, userSessionManagement, nodesRegistrationManagement, deploymentInfo.getConfidentialPortManager());
}
}