src/edu/internet2/middleware/shibboleth/idp/profile/saml1/ShibbolethSSOProfileHandler.java

   1 /*
   2  * Copyright [2007] [University Corporation for Advanced Internet Development, Inc.]
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package edu.internet2.middleware.shibboleth.idp.profile.saml1;
  18
  19 import java.io.IOException;
  20 import java.io.UnsupportedEncodingException;
  21 import java.net.URLDecoder;
  22 import java.util.ArrayList;
  23
  24 import javax.servlet.RequestDispatcher;
  25 import javax.servlet.ServletException;
  26 import javax.servlet.ServletRequest;
  27 import javax.servlet.ServletResponse;
  28 import javax.servlet.http.HttpServletRequest;
  29 import javax.servlet.http.HttpServletResponse;
  30 import javax.servlet.http.HttpSession;
  31
  32 import org.apache.log4j.Logger;
  33 import org.opensaml.common.SAMLObject;
  34 import org.opensaml.common.SAMLObjectBuilder;
  35 import org.opensaml.common.binding.BindingException;
  36 import org.opensaml.common.binding.encoding.MessageEncoder;
  37 import org.opensaml.saml1.core.AuthenticationStatement;
  38 import org.opensaml.saml1.core.Response;
  39 import org.opensaml.saml1.core.Statement;
  40 import org.opensaml.saml1.core.StatusCode;
  41 import org.opensaml.saml1.core.Subject;
  42 import org.opensaml.saml2.metadata.IDPSSODescriptor;
  43 import org.opensaml.saml2.metadata.SPSSODescriptor;
  44 import org.opensaml.xml.util.DatatypeHelper;
  45
  46 import edu.internet2.middleware.shibboleth.common.profile.ProfileException;
  47 import edu.internet2.middleware.shibboleth.common.profile.ProfileRequest;
  48 import edu.internet2.middleware.shibboleth.common.profile.ProfileResponse;
  49 import edu.internet2.middleware.shibboleth.common.relyingparty.RelyingPartyConfiguration;
  50 import edu.internet2.middleware.shibboleth.common.relyingparty.provider.saml1.ShibbolethSSOConfiguration;
  51 import edu.internet2.middleware.shibboleth.idp.authn.LoginContext;
  52 import edu.internet2.middleware.shibboleth.idp.authn.ShibbolethSSOLoginContext;
  53
  54 /** Shibboleth SSO request profile handler. */
  55 public class ShibbolethSSOProfileHandler extends AbstractSAML1ProfileHandler {
  56
  57     /** Class logger. */
  58     private final Logger log = Logger.getLogger(ShibbolethSSOProfileHandler.class);
  59
  60     /** Builder of AuthenticationStatement objects. */
  61     private SAMLObjectBuilder<AuthenticationStatement> authnStatementBuilder;
  62
  63     /** URL of the authentication manager servlet. */
  64     private String authenticationManagerPath;
  65
  66     /** Message encoder binding URI. */
  67     private String encodingBinding;
  68
  69     /**
  70      * Constructor.
  71      *
  72      * @param authnManagerPath path to the authentication manager servlet
  73      * @param encoder URI of the encoding binding
  74      *
  75      * @throws IllegalArgumentException thrown if either the authentication manager path or encoding binding URI are
  76      *             null or empty
  77      */
  78     public ShibbolethSSOProfileHandler(String authnManagerPath, String encoder) {
  79         if (DatatypeHelper.isEmpty(authnManagerPath) || DatatypeHelper.isEmpty(encoder)) {
  80             throw new IllegalArgumentException("Authentication manager path and encoder binding URI may not be null");
  81         }
  82
  83         authenticationManagerPath = authnManagerPath;
  84         encodingBinding = encoder;
  85
  86         authnStatementBuilder = (SAMLObjectBuilder<AuthenticationStatement>) getBuilderFactory().getBuilder(
  87                 AuthenticationStatement.DEFAULT_ELEMENT_NAME);
  88     }
  89
  90     /**
  91      * Convenience method for getting the SAML 1 AuthenticationStatement builder.
  92      *
  93      * @return SAML 1 AuthenticationStatement builder
  94      */
  95     public SAMLObjectBuilder<AuthenticationStatement> getAuthenticationStatementBuilder() {
  96         return authnStatementBuilder;
  97     }
  98
  99     /** {@inheritDoc} */
 100     public String getProfileId() {
 101         return "urn:mace:shibboleth:2.0:idp:profiles:shibboleth:request:sso";
 102     }
 103
 104     /** {@inheritDoc} */
 105     public void processRequest(ProfileRequest<ServletRequest> request, ProfileResponse<ServletResponse> response)
 106             throws ProfileException {
 107
 108         HttpSession httpSession = ((HttpServletRequest) request.getRawRequest()).getSession(true);
 109         if (httpSession.getAttribute(LoginContext.LOGIN_CONTEXT_KEY) == null) {
 110             performAuthentication(request, response);
 111         } else {
 112             completeAuthenticationRequest(request, response);
 113         }
 114     }
 115
 116     /**
 117      * Creates a {@link LoginContext} an sends the request off to the AuthenticationManager to begin the process of
 118      * authenticating the user.
 119      *
 120      * @param request current request
 121      * @param response current response
 122      *
 123      * @throws ProfileException thrown if there is a problem creating the login context and transferring control to the
 124      *             authentication manager
 125      */
 126     protected void performAuthentication(ProfileRequest<ServletRequest> request,
 127             ProfileResponse<ServletResponse> response) throws ProfileException {
 128
 129         HttpServletRequest httpRequest = (HttpServletRequest) request.getRawRequest();
 130         HttpServletResponse httpResponse = (HttpServletResponse) response.getRawResponse();
 131         HttpSession httpSession = httpRequest.getSession(true);
 132
 133         LoginContext loginContext = buildLoginContext(httpRequest);
 134         httpSession.setAttribute(LoginContext.LOGIN_CONTEXT_KEY, loginContext);
 135
 136         try {
 137             RequestDispatcher dispatcher = httpRequest.getRequestDispatcher(authenticationManagerPath);
 138             dispatcher.forward(httpRequest, httpResponse);
 139         } catch (IOException ex) {
 140             log.error("Error forwarding Shibboleth SSO request to AuthenticationManager", ex);
 141             throw new ProfileException("Error forwarding Shibboleth SSO request to AuthenticationManager", ex);
 142         } catch (ServletException ex) {
 143             log.error("Error forwarding Shibboleth SSO request to AuthenticationManager", ex);
 144             throw new ProfileException("Error forwarding Shibboleth SSO request to AuthenticationManager", ex);
 145         }
 146     }
 147
 148     /**
 149      * Creates a response to the Shibboleth SSO and sends the user, with response in tow, back to the relying party
 150      * after they've been authenticated.
 151      *
 152      * @param request current request
 153      * @param response current response
 154      *
 155      * @throws ProfileException thrown if the response can not be created and sent back to the relying party
 156      */
 157     protected void completeAuthenticationRequest(ProfileRequest<ServletRequest> request,
 158             ProfileResponse<ServletResponse> response) throws ProfileException {
 159         HttpSession httpSession = ((HttpServletRequest) request.getRawRequest()).getSession(true);
 160
 161         ShibbolethSSOLoginContext loginContext = (ShibbolethSSOLoginContext) httpSession
 162                 .getAttribute(LoginContext.LOGIN_CONTEXT_KEY);
 163         httpSession.removeAttribute(LoginContext.LOGIN_CONTEXT_KEY);
 164
 165         ShibbolethSSORequestContext requestContext = buildRequestContext(loginContext, request, response);
 166
 167         Response samlResponse;
 168         try {
 169             if (!loginContext.getAuthenticationOK()) {
 170                 requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER, null, "User failed authentication"));
 171                 throw new ProfileException("User failed authentication");
 172             }
 173
 174             ArrayList<Statement> statements = new ArrayList<Statement>();
 175             statements.add(buildAuthenticationStatement(requestContext));
 176             statements.add(buildAttributeStatement(requestContext, "urn:oasis:names:tc:SAML:1.0:cm:sender-vouches"));
 177
 178             samlResponse = buildResponse(requestContext, statements);
 179         } catch (ProfileException e) {
 180             samlResponse = buildErrorResponse(requestContext);
 181         }
 182
 183         requestContext.setSamlResponse(samlResponse);
 184         encodeResponse(requestContext);
 185         writeAuditLogEntry(requestContext);
 186     }
 187
 188     /**
 189      * Creates a login context from the incoming HTTP request.
 190      *
 191      * @param request current HTTP request
 192      *
 193      * @return the constructed login context
 194      *
 195      * @throws ProfileException thrown if the incomming request did not contain a providerId, shire, and target
 196      *             parameter
 197      */
 198     protected ShibbolethSSOLoginContext buildLoginContext(HttpServletRequest request) throws ProfileException {
 199         ShibbolethSSOLoginContext loginContext = new ShibbolethSSOLoginContext();
 200
 201         try {
 202             String providerId = DatatypeHelper.safeTrimOrNullString(request.getParameter("providerId"));
 203             if (providerId == null) {
 204                 log.error("No providerId parameter in Shibboleth SSO request");
 205                 throw new ProfileException("No providerId parameter in Shibboleth SSO request");
 206             }
 207             loginContext.setRelyingParty(URLDecoder.decode(providerId, "UTF-8"));
 208
 209             String acs = DatatypeHelper.safeTrimOrNullString(request.getParameter("shire"));
 210             if (acs == null) {
 211                 log.error("No shire parameter in Shibboleth SSO request");
 212                 throw new ProfileException("No shire parameter in Shibboleth SSO request");
 213             }
 214             loginContext.setSpAssertionConsumerService(URLDecoder.decode(acs, "UTF-8"));
 215
 216             String target = DatatypeHelper.safeTrimOrNullString(request.getParameter("target"));
 217             if (target == null) {
 218                 log.error("No target parameter in Shibboleth SSO request");
 219                 throw new ProfileException("No target parameter in Shibboleth SSO request");
 220             }
 221             loginContext.setSpTarget(URLDecoder.decode(target, "UTF-8"));
 222         } catch (UnsupportedEncodingException e) {
 223             // UTF-8 encoding required to be supported by all JVMs.
 224         }
 225
 226         loginContext.setAuthenticationManagerURL(authenticationManagerPath);
 227         loginContext.setProfileHandlerURL(request.getRequestURI());
 228         return loginContext;
 229     }
 230
 231     /**
 232      * Creates an authentication request context from the current environmental information.
 233      *
 234      * @param loginContext current login context
 235      * @param request current request
 236      * @param response current response
 237      *
 238      * @return created authentication request context
 239      */
 240     protected ShibbolethSSORequestContext buildRequestContext(ShibbolethSSOLoginContext loginContext,
 241             ProfileRequest<ServletRequest> request, ProfileResponse<ServletResponse> response) {
 242         ShibbolethSSORequestContext requestContext = new ShibbolethSSORequestContext(request, response);
 243
 244         requestContext.setLoginContext(loginContext);
 245
 246         requestContext.setPrincipalName(loginContext.getUserID());
 247
 248         requestContext.setPrincipalAuthenticationMethod(loginContext.getAuthenticationMethod());
 249
 250         String relyingPartyId = loginContext.getRelyingPartyId();
 251
 252         requestContext.setRelyingPartyId(relyingPartyId);
 253
 254         RelyingPartyConfiguration rpConfig = getRelyingPartyConfiguration(relyingPartyId);
 255         requestContext.setRelyingPartyConfiguration(rpConfig);
 256
 257         requestContext.setRelyingPartyRole(SPSSODescriptor.DEFAULT_ELEMENT_NAME);
 258
 259         requestContext.setAssertingPartyId(requestContext.getRelyingPartyConfiguration().getProviderId());
 260
 261         requestContext.setAssertingPartyRole(IDPSSODescriptor.DEFAULT_ELEMENT_NAME);
 262
 263         requestContext.setProfileConfiguration((ShibbolethSSOConfiguration) rpConfig
 264                 .getProfileConfiguration(ShibbolethSSOConfiguration.PROFILE_ID));
 265
 266         return requestContext;
 267     }
 268
 269     /**
 270      * Builds the authentication statement for the authenticated principal.
 271      *
 272      * @param requestContext current request context
 273      *
 274      * @return the created statement
 275      */
 276     protected AuthenticationStatement buildAuthenticationStatement(ShibbolethSSORequestContext requestContext)
 277             throws ProfileException {
 278         ShibbolethSSOLoginContext loginContext = requestContext.getLoginContext();
 279
 280         AuthenticationStatement statement = getAuthenticationStatementBuilder().buildObject();
 281         statement.setAuthenticationInstant(loginContext.getAuthenticationInstant());
 282         statement.setAuthenticationMethod(loginContext.getAuthenticationMethod());
 283
 284         // TODO
 285         statement.setSubjectLocality(null);
 286
 287         Subject statementSubject = buildSubject(requestContext, "urn:oasis:names:tc:SAML:1.0:cm:sender-vouches");
 288         statement.setSubject(statementSubject);
 289
 290         return statement;
 291     }
 292
 293     /**
 294      * Encodes the request's SAML response and writes it to the servlet response.
 295      *
 296      * @param requestContext current request context
 297      *
 298      * @throws ProfileException thrown if no message encoder is registered for this profiles binding
 299      */
 300     protected void encodeResponse(ShibbolethSSORequestContext requestContext) throws ProfileException {
 301         if (log.isDebugEnabled()) {
 302             log.debug("Encoding response to SAML request from relying party " + requestContext.getRelyingPartyId());
 303         }
 304         MessageEncoder<ServletResponse> encoder = getMessageEncoderFactory().getMessageEncoder(encodingBinding);
 305         if (encoder == null) {
 306             throw new ProfileException("No response encoder was registered for binding type: " + encodingBinding);
 307         }
 308
 309         super.populateMessageEncoder(encoder);
 310         encoder.setResponse(requestContext.getProfileResponse().getRawResponse());
 311         encoder.setSamlMessage(requestContext.getSamlResponse());
 312         requestContext.setMessageEncoder(encoder);
 313
 314         try {
 315             encoder.encode();
 316         } catch (BindingException e) {
 317             throw new ProfileException("Unable to encode response to relying party: "
 318                     + requestContext.getRelyingPartyId(), e);
 319         }
 320     }
 321
 322     /** Represents the internal state of a Shibboleth SSO Request while it's being processed by the IdP. */
 323     protected class ShibbolethSSORequestContext extends
 324             SAML1ProfileRequestContext<SAMLObject, Response, ShibbolethSSOConfiguration> {
 325
 326         /** Current login context. */
 327         private ShibbolethSSOLoginContext loginContext;
 328
 329         /**
 330          * Constructor.
 331          *
 332          * @param request current profile request
 333          * @param response current profile response
 334          */
 335         public ShibbolethSSORequestContext(ProfileRequest<ServletRequest> request,
 336                 ProfileResponse<ServletResponse> response) {
 337             super(request, response);
 338         }
 339
 340         /**
 341          * Gets the current login context.
 342          *
 343          * @return current login context
 344          */
 345         public ShibbolethSSOLoginContext getLoginContext() {
 346             return loginContext;
 347         }
 348
 349         /**
 350          * Sets the current login context.
 351          *
 352          * @param context current login context
 353          */
 354         public void setLoginContext(ShibbolethSSOLoginContext context) {
 355             loginContext = context;
 356         }
 357     }
 358 }