src/edu/internet2/middleware/shibboleth/idp/provider/E_AuthSSOHandler.java

   1 /*
   2  * The Shibboleth License, Version 1. Copyright (c) 2002 University Corporation for Advanced Internet Development, Inc.
   3  * All rights reserved Redistribution and use in source and binary forms, with or without modification, are permitted
   4  * provided that the following conditions are met: Redistributions of source code must retain the above copyright
   5  * notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above
   6  * copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials
   7  * provided with the distribution, if any, must include the following acknowledgment: "This product includes software
   8  * developed by the University Corporation for Advanced Internet Development <http://www.ucaid.edu> Internet2 Project.
   9  * Alternately, this acknowledegement may appear in the software itself, if and wherever such third-party
  10  * acknowledgments normally appear. Neither the name of Shibboleth nor the names of its contributors, nor Internet2, nor
  11  * the University Corporation for Advanced Internet Development, Inc., nor UCAID may be used to endorse or promote
  12  * products derived from this software without specific prior written permission. For written permission, please contact
  13  * shibboleth@shibboleth.org Products derived from this software may not be called Shibboleth, Internet2, UCAID, or the
  14  * University Corporation for Advanced Internet Development, nor may Shibboleth appear in their name, without prior
  15  * written permission of the University Corporation for Advanced Internet Development. THIS SOFTWARE IS PROVIDED BY THE
  16  * COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND WITH ALL FAULTS. ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT ARE
  18  * DISCLAIMED AND THE ENTIRE RISK OF SATISFACTORY QUALITY, PERFORMANCE, ACCURACY, AND EFFORT IS WITH LICENSEE. IN NO
  19  * EVENT SHALL THE COPYRIGHT OWNER, CONTRIBUTORS OR THE UNIVERSITY CORPORATION FOR ADVANCED INTERNET DEVELOPMENT, INC.
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  21  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  23  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 package edu.internet2.middleware.shibboleth.idp.provider;
  27
  28 import java.io.IOException;
  29 import java.net.URLEncoder;
  30 import java.security.Principal;
  31 import java.util.ArrayList;
  32 import java.util.Arrays;
  33 import java.util.Date;
  34 import java.util.Iterator;
  35 import java.util.List;
  36
  37 import javax.servlet.ServletException;
  38 import javax.servlet.http.Cookie;
  39 import javax.servlet.http.HttpServletRequest;
  40 import javax.servlet.http.HttpServletResponse;
  41
  42 import org.apache.log4j.Logger;
  43 import org.opensaml.SAMLAssertion;
  44 import org.opensaml.SAMLAttribute;
  45 import org.opensaml.SAMLAttributeStatement;
  46 import org.opensaml.SAMLAuthenticationStatement;
  47 import org.opensaml.SAMLException;
  48 import org.opensaml.SAMLNameIdentifier;
  49 import org.opensaml.SAMLRequest;
  50 import org.opensaml.SAMLResponse;
  51 import org.opensaml.SAMLStatement;
  52 import org.opensaml.SAMLSubject;
  53 import org.opensaml.artifact.Artifact;
  54 import org.w3c.dom.Element;
  55
  56 import edu.internet2.middleware.shibboleth.aa.AAException;
  57 import edu.internet2.middleware.shibboleth.common.LocalPrincipal;
  58 import edu.internet2.middleware.shibboleth.common.NameIdentifierMappingException;
  59 import edu.internet2.middleware.shibboleth.common.RelyingParty;
  60 import edu.internet2.middleware.shibboleth.common.ShibbolethConfigurationException;
  61 import edu.internet2.middleware.shibboleth.idp.IdPProtocolHandler;
  62 import edu.internet2.middleware.shibboleth.idp.IdPProtocolSupport;
  63 import edu.internet2.middleware.shibboleth.idp.InvalidClientDataException;
  64 import edu.internet2.middleware.shibboleth.metadata.Endpoint;
  65 import edu.internet2.middleware.shibboleth.metadata.EntityDescriptor;
  66 import edu.internet2.middleware.shibboleth.metadata.SPSSODescriptor;
  67
  68 /**
  69  * <code>ProtocolHandler</code> implementation that responds to SSO flows as specified in "E-Authentication Interface
  70  * Specifications for the SAML Artifact Profile ".
  71  *
  72  * @author Walter Hoehn
  73  */
  74 public class E_AuthSSOHandler extends SSOHandler implements IdPProtocolHandler {
  75
  76         private static Logger log = Logger.getLogger(E_AuthSSOHandler.class.getName());
  77         private String eAuthPortal = "http://eauth.firstgov.gov/service/select";
  78         private String eAuthError = "http://eauth.firstgov.gov/service/error";
  79         private String csid;
  80
  81         /**
  82          * Required DOM-based constructor.
  83          */
  84         public E_AuthSSOHandler(Element config) throws ShibbolethConfigurationException {
  85
  86                 super(config);
  87                 csid = config.getAttribute("csid");
  88                 if (csid == null || csid.equals("")) {
  89                         log.error("(csid) attribute is required for the " + getHandlerName() + "protocol handler.");
  90                         throw new ShibbolethConfigurationException("Unable to initialize protocol handler.");
  91                 }
  92
  93                 String portal = config.getAttribute("eAuthPortal");
  94                 if (portal != null && !portal.equals("")) {
  95                         eAuthPortal = portal;
  96                 }
  97
  98                 String error = config.getAttribute("eAuthError");
  99                 if (error != null && !error.equals("")) {
 100                         eAuthError = portal;
 101                 }
 102         }
 103
 104         /*
 105          * @see edu.internet2.middleware.shibboleth.idp.IdPProtocolHandler#getHandlerName()
 106          */
 107         public String getHandlerName() {
 108
 109                 return "E-Authentication SSO";
 110         }
 111
 112         /*
 113          * @see edu.internet2.middleware.shibboleth.idp.IdPProtocolHandler#processRequest(javax.servlet.http.HttpServletRequest,
 114          *      javax.servlet.http.HttpServletResponse, org.opensaml.SAMLRequest,
 115          *      edu.internet2.middleware.shibboleth.idp.IdPProtocolSupport)
 116          */
 117         public SAMLResponse processRequest(HttpServletRequest request, HttpServletResponse response,
 118                         SAMLRequest samlRequest, IdPProtocolSupport support) throws SAMLException, IOException, ServletException {
 119
 120                 // Sanity check
 121                 if (samlRequest != null) {
 122                         log.error("Protocol Handler received a SAML Request, but is unable to handle it.");
 123                         throw new SAMLException(SAMLException.RESPONDER, "General error processing request.");
 124                 }
 125
 126                 // If no aaid is specified, redirect to the eAuth portal
 127                 if (request.getParameter("aaid") == null || request.getParameter("aaid").equals("")) {
 128                         log.debug("Received an E-Authentication request with no (aaid) parameter.  "
 129                                         + "Redirecting to the E-Authentication portal.");
 130                         response.sendRedirect(eAuthPortal + "?csid=" + csid);
 131                         return null;
 132                 }
 133
 134                 // FUTURE at some point this needs to be integrated with SAML2 session reset
 135                 // If session reset was requested, delete the session and re-direct back
 136                 // Note, this only works with servler form-auth
 137                 String reAuth = request.getParameter("sessionreset");
 138                 if (reAuth != null && reAuth.equals("1")) {
 139                         log.debug("E-Authebtication session reset requested.");
 140                         Cookie session = new Cookie("JSESSIONID", null);
 141                         session.setMaxAge(0);
 142                         response.addCookie(session);
 143
 144                         response.sendRedirect(request.getRequestURI()
 145                                         + (request.getQueryString() != null ? "?"
 146                                                         + request.getQueryString().replaceAll("(^sessionreset=1&?|&?sessionreset=1)", "") : ""));
 147                         return null;
 148                 }
 149                 // Sanity check
 150                 try {
 151                         validateEngineData(request);
 152                 } catch (InvalidClientDataException e) {
 153                         throw new SAMLException(SAMLException.RESPONDER, e.getMessage());
 154                 }
 155
 156                 // Get the authN info
 157                 String username = support.getIdPConfig().getAuthHeaderName().equalsIgnoreCase("REMOTE_USER") ? request
 158                                 .getRemoteUser() : request.getHeader(support.getIdPConfig().getAuthHeaderName());
 159                 if ((username == null) || (username.equals(""))) {
 160                         log.error("Unable to authenticate remote user.");
 161                         throw new SAMLException(SAMLException.RESPONDER, "General error processing request.");
 162                 }
 163                 LocalPrincipal principal = new LocalPrincipal(username);
 164
 165                 // Select the appropriate Relying Party configuration for the request
 166                 String remoteProviderId = request.getParameter("aaid");
 167                 log.debug("Remote provider has identified itself as: (" + remoteProviderId + ").");
 168                 RelyingParty relyingParty = support.getServiceProviderMapper().getRelyingParty(remoteProviderId);
 169
 170                 if (relyingParty == null || relyingParty.isLegacyProvider()) {
 171                         log.error("Unable to identify appropriate relying party configuration.");
 172                         eAuthError(response, 30, remoteProviderId, csid);
 173                         return null;
 174                 }
 175
 176                 // Lookup the provider in the metadata
 177                 EntityDescriptor entity = support.lookup(relyingParty.getProviderId());
 178                 if (entity == null) {
 179                         log.error("No metadata found for EAuth provider.");
 180                         eAuthError(response, 30, remoteProviderId, csid);
 181                         return null;
 182                 }
 183                 SPSSODescriptor role = entity.getSPSSODescriptor("urn:oasis:names:tc:SAML:1.1:protocol");
 184                 if (role == null) {
 185                         log.error("Inappropriate metadata for EAuth provider.");
 186                         eAuthError(response, 30, remoteProviderId, csid);
 187                         return null;
 188                 }
 189
 190                 // The EAuth profile requires metadata, since the assertion consumer is not supplied as a request parameter
 191                 // Pull the consumer URL from the metadata
 192                 Iterator endpoints = role.getAssertionConsumerServiceManager().getEndpoints();
 193                 if (endpoints == null || !endpoints.hasNext()) {
 194                         log.error("Inappropriate metadata for provider: no roles specified.");
 195                         eAuthError(response, 30, remoteProviderId, csid);
 196                         return null;
 197                 }
 198                 String consumerURL = ((Endpoint) endpoints.next()).getLocation();
 199                 log.debug("Assertion Consumer URL provider: " + consumerURL);
 200
 201                 // Create SAML Name Identifier & Subject
 202                 SAMLNameIdentifier nameId;
 203                 try {
 204                         // TODO verify that the nameId is the right format here and error if not
 205                         nameId = support.getNameMapper().getNameIdentifierName(relyingParty.getHSNameFormatId(), principal,
 206                                         relyingParty, relyingParty.getIdentityProvider());
 207                 } catch (NameIdentifierMappingException e) {
 208                         log.error("Error converting principal to SAML Name Identifier: " + e);
 209                         eAuthError(response, 60, remoteProviderId, csid);
 210                         return null;
 211                 }
 212
 213                 String[] confirmationMethods = {SAMLSubject.CONF_ARTIFACT};
 214                 SAMLSubject authNSubject = new SAMLSubject(nameId, Arrays.asList(confirmationMethods), null, null);
 215
 216                 // Determine AuthN method
 217                 String authenticationMethod = request.getHeader("SAMLAuthenticationMethod");
 218                 if (authenticationMethod == null || authenticationMethod.equals("")) {
 219                         authenticationMethod = relyingParty.getDefaultAuthMethod().toString();
 220                         log.debug("User was authenticated via the default method for this relying party (" + authenticationMethod
 221                                         + ").");
 222                 } else {
 223                         log.debug("User was authenticated via the method (" + authenticationMethod + ").");
 224                 }
 225
 226                 String issuer = relyingParty.getIdentityProvider().getProviderId();
 227
 228                 log.info("Resolving attributes.");
 229                 List attributes = null;
 230                 try {
 231                         attributes = Arrays.asList(support.getReleaseAttributes(principal, relyingParty, relyingParty.getProviderId(), null));
 232                 } catch (AAException e1) {
 233                         log.error("Error resolving attributes: " + e1);
 234                         eAuthError(response, 90, remoteProviderId, csid);
 235                         return null;
 236                 }
 237                 log.info("Found " + attributes.size() + " attribute(s) for " + principal.getName());
 238
 239                 // Bail if we didn't get any attributes
 240                 if (attributes == null || attributes.size() < 1) {
 241                         log.error("Attribute resolver did not return any attributes. "
 242                                         + " The E-Authentication profile's minimum attribute requirements were not met.");
 243                         eAuthError(response, 60, remoteProviderId, csid);
 244                         return null;
 245
 246                         // OK, we got attributes back, package them as required for eAuth and combine them with the authN data in an
 247                         // assertion
 248                 } else {
 249                         try {
 250                                 attributes = repackageForEauth(attributes);
 251                         } catch (SAMLException e) {
 252                                 eAuthError(response, 90, remoteProviderId, csid);
 253                                 return null;
 254                         }
 255
 256                         // Put all attributes into an assertion
 257                         try {
 258                                 // TODO provide a way to override authN time
 259                                 SAMLStatement attrStatement = new SAMLAttributeStatement((SAMLSubject) authNSubject.clone(), attributes);
 260                                 SAMLStatement[] statements = {
 261                                                 new SAMLAuthenticationStatement(authNSubject, authenticationMethod, new Date(System
 262                                                                 .currentTimeMillis()), request.getRemoteAddr(), null, null), attrStatement};
 263                                 SAMLAssertion assertion = new SAMLAssertion(issuer, new Date(System.currentTimeMillis()), new Date(
 264                                                 System.currentTimeMillis() + 300000), null, null, Arrays.asList(statements));
 265                                 if (log.isDebugEnabled()) {
 266                                         log.debug("Dumping generated SAML Assertion:" + System.getProperty("line.separator")
 267                                                         + assertion.toString());
 268                                 }
 269
 270                                 // Redirect to agency application
 271                                 try {
 272                                         respondWithArtifact(response, support, consumerURL, principal, assertion, nameId, role,
 273                                                         relyingParty);
 274                                         return null;
 275                                 } catch (SAMLException e) {
 276                                         eAuthError(response, 90, remoteProviderId, csid);
 277                                         return null;
 278                                 }
 279
 280                         } catch (CloneNotSupportedException e) {
 281                                 log.error("An error was encountered while generating assertion: " + e);
 282                                 eAuthError(response, 90, remoteProviderId, csid);
 283                                 return null;
 284                         }
 285                 }
 286         }
 287
 288         private void respondWithArtifact(HttpServletResponse response, IdPProtocolSupport support, String acceptanceURL,
 289                         Principal principal, SAMLAssertion assertion, SAMLNameIdentifier nameId, SPSSODescriptor descriptor,
 290                         RelyingParty relyingParty) throws SAMLException, IOException {
 291
 292                 // Create artifacts for each assertion
 293                 ArrayList artifacts = new ArrayList();
 294
 295                 artifacts.add(support.getArtifactMapper().generateArtifact(assertion, relyingParty));
 296
 297                 String target = relyingParty.getDefaultTarget();
 298                 if (target == null || target.equals("")) {
 299                         log.error("No default target found.  Relying Party elements corresponding to "
 300                                         + "E-Authentication providers must have a (defaultTarget) attribute specified.");
 301                         throw new SAMLException(SAMLException.RESPONDER, "General error processing request.");
 302                 }
 303
 304                 // Assemble the query string
 305                 StringBuffer destination = new StringBuffer(acceptanceURL);
 306                 destination.append("?TARGET=");
 307                 destination.append(URLEncoder.encode(target, "UTF-8"));
 308                 Iterator iterator = artifacts.iterator();
 309                 StringBuffer artifactBuffer = new StringBuffer(); // Buffer for the transaction log
 310
 311                 // Construct the artifact query parameter
 312                 while (iterator.hasNext()) {
 313                         Artifact artifact = (Artifact) iterator.next();
 314                         artifactBuffer.append("(" + artifact.encode() + ")");
 315                         destination.append("&SAMLart=");
 316                         destination.append(URLEncoder.encode(artifact.encode(), "UTF-8"));
 317                 }
 318
 319                 log.debug("Redirecting to (" + destination.toString() + ").");
 320                 response.sendRedirect(destination.toString()); // Redirect to the artifact receiver
 321                 support.getTransactionLog().info(
 322                                 "Assertion artifact(s) (" + artifactBuffer.toString() + ") issued to E-Authentication provider ("
 323                                                 + relyingParty.getProviderId() + ") on behalf of principal ("
 324                                                 + principal.getName() + "). Name Identifier: (" + nameId.getName()
 325                                                 + "). Name Identifier Format: (" + nameId.getFormat() + ").");
 326
 327         }
 328
 329         private List repackageForEauth(List attributes) throws SAMLException {
 330
 331                 ArrayList  writeable = new ArrayList(attributes);
 332                 // Bail if we didn't get a commonName, because it is required by the profile
 333                 SAMLAttribute commonName = getAttribute("commonName", writeable);
 334                 if (commonName == null) {
 335                         log.error("The attribute resolver did not return a (commonName) attribute, "
 336                                         + " which is required for the E-Authentication profile.");
 337                         throw new SAMLException(SAMLException.RESPONDER, "General error processing request.");
 338                 } else {
 339                         // This namespace is required by the eAuth profile
 340                         commonName.setNamespace("http://eauthentication.gsa.gov/federated/attribute");
 341                         // TODO Maybe the resolver should set this
 342                 }
 343                 writeable.add(new SAMLAttribute("csid", "http://eauthentication.gsa.gov/federated/attribute", null, 0, Arrays
 344                                 .asList(new String[]{csid})));
 345                 // TODO pull from authN system? or make configurable
 346                 writeable.add(new SAMLAttribute("assuranceLevel", "http://eauthentication.gsa.gov/federated/attribute", null,
 347                                 0, Arrays.asList(new String[]{"2"})));
 348                 return writeable;
 349         }
 350
 351         private SAMLAttribute getAttribute(String name, List attributes) {
 352
 353                 Iterator iterator = attributes.iterator();
 354                 while (iterator.hasNext()) {
 355                         SAMLAttribute attribute = (SAMLAttribute) iterator.next();
 356                         if (attribute.getName().equals(name)) { return attribute; }
 357                 }
 358                 return null;
 359         }
 360
 361         private void eAuthError(HttpServletResponse response, int code, String aaid, String csid) throws IOException {
 362
 363                 log.info("Redirecting to E-Authentication error page.");
 364                 response.sendRedirect(eAuthError + "?aaid=" + aaid + "&csid=" + csid + "&errcode=" + code);
 365         }
 366 }