/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.identity.federation.web.servlets;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.Principal;
import java.security.PublicKey;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import org.jboss.identity.federation.core.exceptions.ConfigurationException;
import org.jboss.identity.federation.core.exceptions.ParsingException;
import org.jboss.identity.federation.core.saml.v2.constants.JBossSAMLURIConstants;
import org.jboss.identity.federation.core.saml.v2.exceptions.IssueInstantMissingException;
import org.jboss.identity.federation.core.saml.v2.exceptions.IssuerNotTrustedException;
import org.jboss.identity.federation.saml.v2.protocol.AuthnRequestType;
import org.jboss.identity.federation.saml.v2.protocol.RequestAbstractType;
import org.jboss.identity.federation.web.config.IDPType;
import org.jboss.identity.federation.web.config.KeyProviderType;
import org.jboss.identity.federation.web.interfaces.RoleGenerator;
import org.jboss.identity.federation.web.interfaces.TrustKeyConfigurationException;
import org.jboss.identity.federation.web.interfaces.TrustKeyManager;
import org.jboss.identity.federation.web.interfaces.TrustKeyProcessingException;
import org.jboss.identity.federation.web.roles.DefaultRoleGenerator;
import org.jboss.identity.federation.web.util.ConfigurationUtil;
import org.jboss.identity.federation.web.util.IDPWebRequestUtil;
import org.jboss.identity.federation.web.util.RedirectBindingSignatureUtil;
import org.w3c.dom.Document;
/**
* SAML Web Browser SSO - POST binding
* @author Anil.Saldhana@redhat.com
* @since Aug 13, 2009
*/
public class IDPServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
private static Logger log = Logger.getLogger(IDPServlet.class);
private boolean trace = log.isTraceEnabled();
public static final String PRINCIPAL_ID = "jboss_identity.principal";
public static final String ROLES_ID = "jboss_identity.roles";
protected IDPType idpConfiguration = null;
private RoleGenerator rg = new DefaultRoleGenerator();
private long assertionValidity = 5000; // 5 seconds in miliseconds
private String identityURL = null;
private TrustKeyManager keyManager;
private Boolean ignoreIncomingSignatures = true;
private Boolean signOutgoingMessages = true;
private ServletContext context = null;
public Boolean getIgnoreIncomingSignatures()
{
return ignoreIncomingSignatures;
}
@Override
public void init(ServletConfig config) throws ServletException
{
super.init(config);
String configFile = "/WEB-INF/jboss-idfed.xml";
context = config.getServletContext();
InputStream is = context.getResourceAsStream(configFile);
if(is == null)
throw new RuntimeException(configFile + " missing");
try
{
idpConfiguration = ConfigurationUtil.getIDPConfiguration(is);
this.identityURL = idpConfiguration.getIdentityURL();
log.trace("Identity Provider URL=" + this.identityURL);
this.assertionValidity = idpConfiguration.getAssertionValidity();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
if(this.signOutgoingMessages)
{
KeyProviderType keyProvider = this.idpConfiguration.getKeyProvider();
if(keyProvider == null)
throw new RuntimeException("Key Provider is null for context=" + context.getContextPath());
try
{
ClassLoader tcl = SecurityActions.getContextClassLoader();
String keyManagerClassName = keyProvider.getClassName();
if(keyManagerClassName == null)
throw new RuntimeException("KeyManager class name is null");
Class<?> clazz = tcl.loadClass(keyManagerClassName);
this.keyManager = (TrustKeyManager) clazz.newInstance();
keyManager.setAuthProperties(keyProvider.getAuth());
keyManager.setValidatingAlias(keyProvider.getValidatingAlias());
}
catch(Exception e)
{
log.error("Exception reading configuration:",e);
throw new RuntimeException(e.getLocalizedMessage());
}
if(trace)
log.trace("Key Provider=" + keyProvider.getClassName());
}
//handle the role generator
String rgString = config.getInitParameter("ROLE_GENERATOR");
if(rgString != null && !"".equals(rgString))
this.setRoleGenerator(rgString);
}
@SuppressWarnings("unchecked")
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
//Some issue with filters and servlets
HttpSession session = request.getSession(false);
String samlMessage = (String) session.getAttribute("SAMLRequest");
String relayState = (String) session.getAttribute("RelayState");
String referer = request.getHeader("Referer");
//See if the user has already been authenticated
Principal userPrincipal = (Principal) session.getAttribute(PRINCIPAL_ID);
if(userPrincipal == null)
{
//The sys admin has not set up the login servlet filters for the IDP
if(trace)
log.trace("Login Filters have not been configured");
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
IDPWebRequestUtil webRequestUtil = new IDPWebRequestUtil(request,
idpConfiguration, keyManager);
if(userPrincipal != null)
{
if(trace)
{
log.trace("Retrieved saml message and relay state from session");
log.trace("saml message=" + samlMessage + "::relay state="+ relayState);
}
session.removeAttribute("SAMLRequest");
if(relayState != null && relayState.length() > 0)
session.removeAttribute("RelayState");
//Send valid saml response after processing the request
if(samlMessage != null)
{
//Get the SAML Request Message
RequestAbstractType requestAbstractType = null;
Document samlResponse = null;
String destination = null;
try
{
requestAbstractType = webRequestUtil.getSAMLRequest(samlMessage);
boolean isPost = webRequestUtil.hasSAMLRequestInPostProfile();
boolean isValid = validate(request.getRemoteAddr(),
request.getQueryString(),
new SessionHolder(samlMessage, null, null), isPost);
if(!isValid)
throw new GeneralSecurityException("Validation check failed");
webRequestUtil.isTrusted(requestAbstractType.getIssuer().getValue());
List<String> roles = (List<String>) session.getAttribute(ROLES_ID);
if(roles == null)
{
roles = rg.generateRoles(userPrincipal);
session.setAttribute(ROLES_ID, roles);
}
if(trace)
log.trace("Roles have been determined:Creating response");
AuthnRequestType art = (AuthnRequestType) requestAbstractType;
destination = art.getAssertionConsumerServiceURL();
samlResponse =
webRequestUtil.getResponse(destination,
userPrincipal, roles,
this.identityURL, this.assertionValidity, this.signOutgoingMessages);
}
catch (IssuerNotTrustedException e)
{
if(trace) log.trace(e);
samlResponse =
webRequestUtil.getErrorResponse(referer,
JBossSAMLURIConstants.STATUS_REQUEST_DENIED.get(),
this.identityURL, this.signOutgoingMessages);
}
catch (ParsingException e)
{
if(trace) log.trace(e);
samlResponse =
webRequestUtil.getErrorResponse(referer,
JBossSAMLURIConstants.STATUS_AUTHNFAILED.get(),
this.identityURL, this.signOutgoingMessages);
}
catch (ConfigurationException e)
{
if(trace) log.trace(e);
samlResponse =
webRequestUtil.getErrorResponse(referer,
JBossSAMLURIConstants.STATUS_AUTHNFAILED.get(),
this.identityURL, this.signOutgoingMessages);
}
catch (IssueInstantMissingException e)
{
if(trace) log.trace(e);
samlResponse =
webRequestUtil.getErrorResponse(referer,
JBossSAMLURIConstants.STATUS_AUTHNFAILED.get(),
this.identityURL, this.signOutgoingMessages);
}
catch(GeneralSecurityException e)
{
if(trace) log.trace(e);
samlResponse =
webRequestUtil.getErrorResponse(referer,
JBossSAMLURIConstants.STATUS_AUTHNFAILED.get(),
this.identityURL, this.signOutgoingMessages);
}
finally
{
try
{
if(this.signOutgoingMessages)
webRequestUtil.send(samlResponse, destination,relayState, response, true,
this.keyManager.getSigningKey());
else
webRequestUtil.send(samlResponse, destination, relayState, response, false,null);
}
catch (ParsingException e)
{
if(trace) log.trace(e);
}
catch (GeneralSecurityException e)
{
if(trace) log.trace(e);
}
}
return;
}
else
{
log.error("No SAML Request Message");
if(trace) log.trace("Referer="+referer);
try
{
sendErrorResponseToSP(referer, response, relayState, webRequestUtil);
}
catch (ConfigurationException e)
{
if(trace) log.trace(e);
}
}
}
}
protected void sendErrorResponseToSP(String referrer, HttpServletResponse response, String relayState,
IDPWebRequestUtil webRequestUtil) throws ServletException, IOException, ConfigurationException
{
if(trace) log.trace("About to send error response to SP:" + referrer);
Document samlResponse =
webRequestUtil.getErrorResponse(referrer, JBossSAMLURIConstants.STATUS_RESPONDER.get(),
this.identityURL, this.signOutgoingMessages);
try
{
if(this.signOutgoingMessages)
webRequestUtil.send(samlResponse, referrer, relayState, response, true,
this.keyManager.getSigningKey());
else
webRequestUtil.send(samlResponse, referrer, relayState, response, false,null);
}
catch (ParsingException e1)
{
throw new ServletException(e1);
}
catch (GeneralSecurityException e)
{
throw new ServletException(e);
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
}
protected class SessionHolder
{
String samlRequest;
String signature;
String sigAlg;
public SessionHolder(String req, String sig, String alg)
{
this.samlRequest = req;
this.signature = sig;
this.sigAlg = alg;
}
}
protected boolean validate(String remoteAddress,
String queryString,
SessionHolder holder, boolean isPost) throws IOException, GeneralSecurityException
{
if (holder.samlRequest == null || holder.samlRequest.length() == 0)
{
return false;
}
if (!this.ignoreIncomingSignatures && !isPost)
{
String sig = holder.signature;
if (sig == null || sig.length() == 0)
{
log.error("Signature received from SP is null:" + remoteAddress);
return false;
}
//Check if there is a signature
byte[] sigValue = RedirectBindingSignatureUtil.getSignatureValueFromSignedURL(queryString);
if(sigValue == null)
return false;
PublicKey validatingKey;
try
{
validatingKey = keyManager.getValidatingKey(remoteAddress);
}
catch (TrustKeyConfigurationException e)
{
throw new GeneralSecurityException(e.getCause());
}
catch (TrustKeyProcessingException e)
{
throw new GeneralSecurityException(e.getCause());
}
return RedirectBindingSignatureUtil.validateSignature(queryString, validatingKey, sigValue);
}
else
{
//Post binding no signature verification. The SAML message signature is verified
return true;
}
}
private void setRoleGenerator(String rgName)
{
try
{
Class<?> clazz = SecurityActions.getContextClassLoader().loadClass(rgName);
rg = (RoleGenerator) clazz.newInstance();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}