src/edu/internet2/middleware/shibboleth/idp/profile/saml2/AbstractSAML2ProfileHandler.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.saml2;
  18
  19 import java.util.ArrayList;
  20 import java.util.Collection;
  21 import java.util.List;
  22 import java.util.Map;
  23
  24 import javax.servlet.ServletRequest;
  25
  26 import org.apache.log4j.Logger;
  27 import org.joda.time.DateTime;
  28 import org.opensaml.common.SAMLObject;
  29 import org.opensaml.common.SAMLObjectBuilder;
  30 import org.opensaml.common.SAMLVersion;
  31 import org.opensaml.common.impl.SAMLObjectContentReference;
  32 import org.opensaml.log.Level;
  33 import org.opensaml.saml2.core.Assertion;
  34 import org.opensaml.saml2.core.AttributeQuery;
  35 import org.opensaml.saml2.core.AttributeStatement;
  36 import org.opensaml.saml2.core.Audience;
  37 import org.opensaml.saml2.core.AudienceRestriction;
  38 import org.opensaml.saml2.core.AuthnRequest;
  39 import org.opensaml.saml2.core.Conditions;
  40 import org.opensaml.saml2.core.Issuer;
  41 import org.opensaml.saml2.core.NameID;
  42 import org.opensaml.saml2.core.ProxyRestriction;
  43 import org.opensaml.saml2.core.RequestAbstractType;
  44 import org.opensaml.saml2.core.Response;
  45 import org.opensaml.saml2.core.Statement;
  46 import org.opensaml.saml2.core.Status;
  47 import org.opensaml.saml2.core.StatusCode;
  48 import org.opensaml.saml2.core.StatusMessage;
  49 import org.opensaml.saml2.core.StatusResponseType;
  50 import org.opensaml.saml2.core.Subject;
  51 import org.opensaml.saml2.core.SubjectConfirmation;
  52 import org.opensaml.saml2.core.SubjectConfirmationData;
  53 import org.opensaml.saml2.metadata.AttributeAuthorityDescriptor;
  54 import org.opensaml.saml2.metadata.AuthnAuthorityDescriptor;
  55 import org.opensaml.saml2.metadata.Endpoint;
  56 import org.opensaml.saml2.metadata.NameIDFormat;
  57 import org.opensaml.saml2.metadata.PDPDescriptor;
  58 import org.opensaml.saml2.metadata.RoleDescriptor;
  59 import org.opensaml.saml2.metadata.SPSSODescriptor;
  60 import org.opensaml.saml2.metadata.SSODescriptor;
  61 import org.opensaml.ws.transport.http.HTTPInTransport;
  62 import org.opensaml.xml.XMLObjectBuilder;
  63 import org.opensaml.xml.security.credential.Credential;
  64 import org.opensaml.xml.signature.Signature;
  65 import org.opensaml.xml.signature.Signer;
  66 import org.opensaml.xml.util.DatatypeHelper;
  67
  68 import edu.internet2.middleware.shibboleth.common.attribute.AttributeRequestException;
  69 import edu.internet2.middleware.shibboleth.common.attribute.BaseAttribute;
  70 import edu.internet2.middleware.shibboleth.common.attribute.encoding.AttributeEncoder;
  71 import edu.internet2.middleware.shibboleth.common.attribute.encoding.AttributeEncodingException;
  72 import edu.internet2.middleware.shibboleth.common.attribute.encoding.SAML2NameIDAttributeEncoder;
  73 import edu.internet2.middleware.shibboleth.common.attribute.provider.SAML2AttributeAuthority;
  74 import edu.internet2.middleware.shibboleth.common.attribute.provider.ShibbolethSAMLAttributeRequestContext;
  75 import edu.internet2.middleware.shibboleth.common.log.AuditLogEntry;
  76 import edu.internet2.middleware.shibboleth.common.profile.ProfileException;
  77 import edu.internet2.middleware.shibboleth.common.relyingparty.ProfileConfiguration;
  78 import edu.internet2.middleware.shibboleth.common.relyingparty.provider.saml2.AbstractSAML2ProfileConfiguration;
  79 import edu.internet2.middleware.shibboleth.idp.profile.AbstractSAMLProfileHandler;
  80 import edu.internet2.middleware.shibboleth.idp.session.ServiceInformation;
  81 import edu.internet2.middleware.shibboleth.idp.session.Session;
  82
  83 /** Common implementation details for profile handlers. */
  84 public abstract class AbstractSAML2ProfileHandler extends AbstractSAMLProfileHandler {
  85
  86     /** SAML Version for this profile handler. */
  87     public static final SAMLVersion SAML_VERSION = SAMLVersion.VERSION_20;
  88
  89     /** Class logger. */
  90     private Logger log = Logger.getLogger(AbstractSAML2ProfileHandler.class);
  91
  92     /** For building response. */
  93     private SAMLObjectBuilder<Response> responseBuilder;
  94
  95     /** For building status. */
  96     private SAMLObjectBuilder<Status> statusBuilder;
  97
  98     /** For building statuscode. */
  99     private SAMLObjectBuilder<StatusCode> statusCodeBuilder;
 100
 101     /** For building StatusMessages. */
 102     private SAMLObjectBuilder<StatusMessage> statusMessageBuilder;
 103
 104     /** For building assertion. */
 105     private SAMLObjectBuilder<Assertion> assertionBuilder;
 106
 107     /** For building issuer. */
 108     private SAMLObjectBuilder<Issuer> issuerBuilder;
 109
 110     /** For building subject. */
 111     private SAMLObjectBuilder<Subject> subjectBuilder;
 112
 113     /** For building subject confirmation. */
 114     private SAMLObjectBuilder<SubjectConfirmation> subjectConfirmationBuilder;
 115
 116     /** For building subject confirmation data. */
 117     private SAMLObjectBuilder<SubjectConfirmationData> subjectConfirmationDataBuilder;
 118
 119     /** For building conditions. */
 120     private SAMLObjectBuilder<Conditions> conditionsBuilder;
 121
 122     /** For building audience restriction. */
 123     private SAMLObjectBuilder<AudienceRestriction> audienceRestrictionBuilder;
 124
 125     /** For building proxy retrictions. */
 126     private SAMLObjectBuilder<ProxyRestriction> proxyRestrictionBuilder;
 127
 128     /** For building audience. */
 129     private SAMLObjectBuilder<Audience> audienceBuilder;
 130
 131     /** For building signature. */
 132     private XMLObjectBuilder<Signature> signatureBuilder;
 133
 134     /** Constructor. */
 135     @SuppressWarnings("unchecked")
 136     protected AbstractSAML2ProfileHandler() {
 137         super();
 138
 139         responseBuilder = (SAMLObjectBuilder<Response>) getBuilderFactory().getBuilder(Response.DEFAULT_ELEMENT_NAME);
 140         statusBuilder = (SAMLObjectBuilder<Status>) getBuilderFactory().getBuilder(Status.DEFAULT_ELEMENT_NAME);
 141         statusCodeBuilder = (SAMLObjectBuilder<StatusCode>) getBuilderFactory().getBuilder(
 142                 StatusCode.DEFAULT_ELEMENT_NAME);
 143         statusMessageBuilder = (SAMLObjectBuilder<StatusMessage>) getBuilderFactory().getBuilder(
 144                 StatusMessage.DEFAULT_ELEMENT_NAME);
 145         issuerBuilder = (SAMLObjectBuilder<Issuer>) getBuilderFactory().getBuilder(Issuer.DEFAULT_ELEMENT_NAME);
 146         assertionBuilder = (SAMLObjectBuilder<Assertion>) getBuilderFactory()
 147                 .getBuilder(Assertion.DEFAULT_ELEMENT_NAME);
 148         subjectBuilder = (SAMLObjectBuilder<Subject>) getBuilderFactory().getBuilder(Subject.DEFAULT_ELEMENT_NAME);
 149         subjectConfirmationBuilder = (SAMLObjectBuilder<SubjectConfirmation>) getBuilderFactory().getBuilder(
 150                 SubjectConfirmation.DEFAULT_ELEMENT_NAME);
 151         subjectConfirmationDataBuilder = (SAMLObjectBuilder<SubjectConfirmationData>) getBuilderFactory().getBuilder(
 152                 SubjectConfirmationData.DEFAULT_ELEMENT_NAME);
 153         conditionsBuilder = (SAMLObjectBuilder<Conditions>) getBuilderFactory().getBuilder(
 154                 Conditions.DEFAULT_ELEMENT_NAME);
 155         audienceRestrictionBuilder = (SAMLObjectBuilder<AudienceRestriction>) getBuilderFactory().getBuilder(
 156                 AudienceRestriction.DEFAULT_ELEMENT_NAME);
 157         proxyRestrictionBuilder = (SAMLObjectBuilder<ProxyRestriction>) getBuilderFactory().getBuilder(
 158                 ProxyRestriction.DEFAULT_ELEMENT_NAME);
 159         audienceBuilder = (SAMLObjectBuilder<Audience>) getBuilderFactory().getBuilder(Audience.DEFAULT_ELEMENT_NAME);
 160         signatureBuilder = (XMLObjectBuilder<Signature>) getBuilderFactory().getBuilder(Signature.DEFAULT_ELEMENT_NAME);
 161     }
 162
 163     /**
 164      * Checks that the SAML major version for a request is 2.
 165      *
 166      * @param requestContext current request context containing the SAML message
 167      *
 168      * @throws ProfileException thrown if the major version of the SAML request is not 2
 169      */
 170     protected void checkSamlVersion(BaseSAML2ProfileRequestContext<?,?,?> requestContext) throws ProfileException {
 171         SAMLVersion version = requestContext.getInboundSAMLMessage().getVersion();
 172         if (version.getMajorVersion() < 2) {
 173             requestContext.setFailureStatus(buildStatus(StatusCode.VERSION_MISMATCH_URI,
 174                     StatusCode.REQUEST_VERSION_TOO_LOW_URI, null));
 175             throw new ProfileException("SAML request version too low");
 176         } else if (version.getMajorVersion() > 2) {
 177             requestContext.setFailureStatus(buildStatus(StatusCode.VERSION_MISMATCH_URI,
 178                     StatusCode.REQUEST_VERSION_TOO_HIGH_URI, null));
 179             throw new ProfileException("SAML request version too high");
 180         }
 181     }
 182
 183     /**
 184      * Builds a response to the attribute query within the request context.
 185      *
 186      * @param requestContext current request context
 187      * @param subjectConfirmationMethod confirmation method used for the subject
 188      * @param statements the statements to include in the response
 189      *
 190      * @return the built response
 191      *
 192      * @throws ProfileException thrown if there is a problem creating the SAML response
 193      */
 194     protected Response buildResponse(BaseSAML2ProfileRequestContext<?,?,?> requestContext, String subjectConfirmationMethod,
 195             List<Statement> statements) throws ProfileException {
 196
 197         DateTime issueInstant = new DateTime();
 198
 199         Subject subject = buildSubject(requestContext, subjectConfirmationMethod, issueInstant);
 200
 201         // create the assertion and add the attribute statement
 202         Assertion assertion = buildAssertion(requestContext, issueInstant);
 203         assertion.setSubject(subject);
 204         if (statements != null) {
 205             assertion.getStatements().addAll(statements);
 206         }
 207
 208         // create the SAML response and add the assertion
 209         Response samlResponse = responseBuilder.buildObject();
 210         samlResponse.setIssueInstant(issueInstant);
 211         populateStatusResponse(requestContext, samlResponse);
 212
 213         samlResponse.getAssertions().add(assertion);
 214
 215         // sign the assertion if it should be signed
 216         signAssertion(requestContext, assertion);
 217
 218         Status status = buildStatus(StatusCode.SUCCESS_URI, null, null);
 219         samlResponse.setStatus(status);
 220
 221         return samlResponse;
 222     }
 223
 224     /**
 225      * Builds a basic assertion with its id, issue instant, SAML version, issuer, subject, and conditions populated.
 226      *
 227      * @param requestContext current request context
 228      * @param issueInstant time to use as assertion issue instant
 229      *
 230      * @return the built assertion
 231      */
 232     protected Assertion buildAssertion(BaseSAML2ProfileRequestContext<?,?,?> requestContext, DateTime issueInstant) {
 233         Assertion assertion = assertionBuilder.buildObject();
 234         assertion.setID(getIdGenerator().generateIdentifier());
 235         assertion.setIssueInstant(issueInstant);
 236         assertion.setVersion(SAMLVersion.VERSION_20);
 237         assertion.setIssuer(buildEntityIssuer(requestContext));
 238
 239         Conditions conditions = buildConditions(requestContext, issueInstant);
 240         assertion.setConditions(conditions);
 241
 242         return assertion;
 243     }
 244
 245     /**
 246      * Creates an {@link Issuer} populated with information about the relying party.
 247      *
 248      * @param requestContext current request context
 249      *
 250      * @return the built issuer
 251      */
 252     protected Issuer buildEntityIssuer(BaseSAML2ProfileRequestContext<?,?,?> requestContext) {
 253         Issuer issuer = issuerBuilder.buildObject();
 254         issuer.setFormat(Issuer.ENTITY);
 255         issuer.setValue(requestContext.getAssertingPartyEntityId());
 256
 257         return issuer;
 258     }
 259
 260     /**
 261      * Builds a SAML assertion condition set. The following fields are set; not before, not on or after, audience
 262      * restrictions, and proxy restrictions.
 263      *
 264      * @param requestContext current request context
 265      * @param issueInstant timestamp the assertion was created
 266      *
 267      * @return constructed conditions
 268      */
 269     protected Conditions buildConditions(BaseSAML2ProfileRequestContext<?,?,?> requestContext, DateTime issueInstant) {
 270         AbstractSAML2ProfileConfiguration profileConfig = requestContext.getProfileConfiguration();
 271
 272         Conditions conditions = conditionsBuilder.buildObject();
 273         conditions.setNotBefore(issueInstant);
 274         conditions.setNotOnOrAfter(issueInstant.plus(profileConfig.getAssertionLifetime()));
 275
 276         Collection<String> audiences;
 277
 278         // add audience restrictions
 279         audiences = profileConfig.getAssertionAudiences();
 280         if (audiences != null && audiences.size() > 0) {
 281             AudienceRestriction audienceRestriction = audienceRestrictionBuilder.buildObject();
 282             for (String audienceUri : audiences) {
 283                 Audience audience = audienceBuilder.buildObject();
 284                 audience.setAudienceURI(audienceUri);
 285                 audienceRestriction.getAudiences().add(audience);
 286             }
 287             conditions.getAudienceRestrictions().add(audienceRestriction);
 288         }
 289
 290         // add proxy restrictions
 291         audiences = profileConfig.getProxyAudiences();
 292         if (audiences != null && audiences.size() > 0) {
 293             ProxyRestriction proxyRestriction = proxyRestrictionBuilder.buildObject();
 294             Audience audience;
 295             for (String audienceUri : audiences) {
 296                 audience = audienceBuilder.buildObject();
 297                 audience.setAudienceURI(audienceUri);
 298                 proxyRestriction.getAudiences().add(audience);
 299             }
 300
 301             proxyRestriction.setProxyCount(profileConfig.getProxyCount());
 302             conditions.getConditions().add(proxyRestriction);
 303         }
 304
 305         return conditions;
 306     }
 307
 308     /**
 309      * Populates the response's id, in response to, issue instant, version, and issuer properties.
 310      *
 311      * @param requestContext current request context
 312      * @param response the response to populate
 313      */
 314     protected void populateStatusResponse(BaseSAML2ProfileRequestContext<?,?,?> requestContext, StatusResponseType response) {
 315         response.setID(getIdGenerator().generateIdentifier());
 316         if (requestContext.getInboundSAMLMessage() != null) {
 317             response.setInResponseTo(requestContext.getInboundSAMLMessageId());
 318         }
 319         response.setVersion(SAMLVersion.VERSION_20);
 320         response.setIssuer(buildEntityIssuer(requestContext));
 321     }
 322
 323     /**
 324      * Resolves the attributes for the principal.
 325      *
 326      * @param requestContext current request context
 327      *
 328      * @throws ProfileException thrown if there is a problem resolved attributes
 329      */
 330     protected void resolveAttributes(BaseSAML2ProfileRequestContext<?,?,?> requestContext) throws ProfileException{
 331         AbstractSAML2ProfileConfiguration profileConfiguration = requestContext.getProfileConfiguration();
 332         SAML2AttributeAuthority attributeAuthority = profileConfiguration.getAttributeAuthority();
 333
 334         try {
 335             if (log.isDebugEnabled()) {
 336                 log.debug("Resolving attributes for principal " + requestContext.getPrincipalName()
 337                         + " of SAML request " + requestContext.getInboundSAMLMessageId() + " from relying party "
 338                         + requestContext.getRelyingPartyEntityId());
 339             }
 340             Map<String, BaseAttribute> principalAttributes = attributeAuthority
 341                     .getAttributes(buildAttributeRequestContext(requestContext));
 342
 343             requestContext.setPrincipalAttributes(principalAttributes);
 344         } catch (AttributeRequestException e) {
 345             log.error("Error resolving attributes for SAML request " + requestContext.getInboundSAMLMessageId()
 346                     + " from relying party " + requestContext.getRelyingPartyEntityId(), e);
 347             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, null, "Error resolving attributes"));
 348             throw new ProfileException("Error resolving attributes for SAML request "
 349                     + requestContext.getInboundSAMLMessageId() + " from relying party "
 350                     + requestContext.getRelyingPartyEntityId(), e);
 351         }
 352     }
 353
 354     /**
 355      * Executes a query for attributes and builds a SAML attribute statement from the results.
 356      *
 357      * @param requestContext current request context
 358      *
 359      * @return attribute statement resulting from the query
 360      *
 361      * @throws ProfileException thrown if there is a problem making the query
 362      */
 363     protected AttributeStatement buildAttributeStatement(BaseSAML2ProfileRequestContext<?,?,?> requestContext)
 364             throws ProfileException {
 365         if (log.isDebugEnabled()) {
 366             log.debug("Creating attribute statement in response to SAML request "
 367                     + requestContext.getInboundSAMLMessageId() + " from relying party "
 368                     + requestContext.getRelyingPartyEntityId());
 369         }
 370         AbstractSAML2ProfileConfiguration profileConfiguration = requestContext.getProfileConfiguration();
 371         SAML2AttributeAuthority attributeAuthority = profileConfiguration.getAttributeAuthority();
 372         try {
 373             if (requestContext.getInboundSAMLMessage() instanceof AttributeQuery) {
 374                 return attributeAuthority.buildAttributeStatement((AttributeQuery) requestContext.getInboundSAMLMessage(),
 375                         requestContext.getPrincipalAttributes().values());
 376             } else {
 377                 return attributeAuthority.buildAttributeStatement(null, requestContext.getPrincipalAttributes().values());
 378             }
 379         } catch (AttributeRequestException e) {
 380             log.error("Error encoding attributes for principal " + requestContext.getPrincipalName(), e);
 381             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, null, "Error resolving attributes"));
 382             throw new ProfileException("Error encoding attributes for principal " + requestContext.getPrincipalName(), e);
 383         }
 384     }
 385
 386     /**
 387      * Resolves the principal name of the subject of the request.
 388      *
 389      * @param requestContext current request context
 390      *
 391      * @throws ProfileException thrown if the principal name can not be resolved
 392      */
 393     protected void resolvePrincipal(BaseSAML2ProfileRequestContext<RequestAbstractType, StatusResponseType, AbstractSAML2ProfileConfiguration> requestContext) throws ProfileException {
 394         AbstractSAML2ProfileConfiguration profileConfiguration = requestContext.getProfileConfiguration();
 395         if (profileConfiguration == null) {
 396             log.error("Unable to resolve principal, no SAML 2 profile configuration for relying party "
 397                     + requestContext.getRelyingPartyEntityId());
 398             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, StatusCode.REQUEST_DENIED_URI,
 399                     "Error resolving principal"));
 400             throw new ProfileException(
 401                     "Unable to resolve principal, no SAML 2 profile configuration for relying party "
 402                             + requestContext.getRelyingPartyEntityId());
 403         }
 404         SAML2AttributeAuthority attributeAuthority = profileConfiguration.getAttributeAuthority();
 405
 406         if (log.isDebugEnabled()) {
 407             log.debug("Resolving principal name for subject of SAML request " + requestContext.getInboundSAMLMessageId()
 408                     + " from relying party " + requestContext.getRelyingPartyEntityId());
 409         }
 410
 411         try {
 412             String principal = attributeAuthority.getPrincipal(requestContext);
 413             requestContext.setPrincipalName(principal);
 414         } catch (AttributeRequestException e) {
 415             log.error("Error resolving attributes for SAML request " + requestContext.getInboundSAMLMessageId()
 416                     + " from relying party " + requestContext.getRelyingPartyEntityId(), e);
 417             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, StatusCode.UNKNOWN_PRINCIPAL_URI,
 418                     "Error resolving principal"));
 419             throw new ProfileException("Error resolving attributes for SAML request "
 420                     + requestContext.getInboundSAMLMessageId() + " from relying party "
 421                     + requestContext.getRelyingPartyEntityId(), e);
 422         }
 423     }
 424
 425     /**
 426      * Signs the given assertion if either the current profile configuration or the relying party configuration contains
 427      * signing credentials.
 428      *
 429      * @param requestContext current request context
 430      * @param assertion assertion to sign
 431      *
 432      * @throws ProfileException thrown if the metadata can not be located for the relying party or, if signing is
 433      *             required, if a signing credential is not configured
 434      */
 435     protected void signAssertion(BaseSAML2ProfileRequestContext<?,?,?> requestContext, Assertion assertion)
 436             throws ProfileException {
 437         if (log.isDebugEnabled()) {
 438             log.debug("Determining if SAML assertion to relying party " + requestContext.getRelyingPartyEntityId()
 439                     + " should be signed");
 440         }
 441
 442         boolean signAssertion = false;
 443
 444         AbstractSAML2ProfileConfiguration profileConfig = requestContext.getProfileConfiguration();
 445
 446         if (requestContext.getRelyingPartyRoleMetadata() instanceof SPSSODescriptor) {
 447             SPSSODescriptor ssoDescriptor = (SPSSODescriptor) requestContext.getRelyingPartyRoleMetadata();
 448             if (ssoDescriptor.getWantAssertionsSigned() != null) {
 449                 signAssertion = ssoDescriptor.getWantAssertionsSigned().booleanValue();
 450                 if (log.isDebugEnabled()) {
 451                     log.debug("Entity metadata for relying party " + requestContext.getRelyingPartyEntityId()
 452                             + " indicates to sign assertions: " + signAssertion);
 453                 }
 454             }
 455         } else if (profileConfig.getSignAssertions()) {
 456             signAssertion = true;
 457             log.debug("IdP relying party configuration "
 458                     + requestContext.getRelyingPartyConfiguration().getRelyingPartyId()
 459                     + " indicates to sign assertions: " + signAssertion);
 460         }
 461
 462         if (!signAssertion) {
 463             return;
 464         }
 465
 466         if (log.isDebugEnabled()) {
 467             log.debug("Determining signing credntial for assertion to relying party "
 468                     + requestContext.getRelyingPartyEntityId());
 469         }
 470         Credential signatureCredential = profileConfig.getSigningCredential();
 471         if (signatureCredential == null) {
 472             signatureCredential = requestContext.getRelyingPartyConfiguration().getDefaultSigningCredential();
 473         }
 474
 475         if (signatureCredential == null) {
 476             throw new ProfileException("No signing credential is specified for relying party configuration "
 477                     + requestContext.getRelyingPartyConfiguration().getProviderId()
 478                     + " or it's SAML2 attribute query profile configuration");
 479         }
 480
 481         if (log.isDebugEnabled()) {
 482             log.debug("Signing assertion to relying party " + requestContext.getRelyingPartyEntityId());
 483         }
 484         SAMLObjectContentReference contentRef = new SAMLObjectContentReference(assertion);
 485         Signature signature = signatureBuilder.buildObject(Signature.DEFAULT_ELEMENT_NAME);
 486         signature.getContentReferences().add(contentRef);
 487         assertion.setSignature(signature);
 488
 489         Signer.signObject(signature);
 490     }
 491
 492     /**
 493      * Build a status message, with an optional second-level failure message.
 494      *
 495      * @param topLevelCode The top-level status code. Should be from saml-core-2.0-os, sec. 3.2.2.2
 496      * @param secondLevelCode An optional second-level failure code. Should be from saml-core-2.0-is, sec 3.2.2.2. If
 497      *            null, no second-level Status element will be set.
 498      * @param failureMessage An optional second-level failure message
 499      *
 500      * @return a Status object.
 501      */
 502     protected Status buildStatus(String topLevelCode, String secondLevelCode, String failureMessage) {
 503         Status status = statusBuilder.buildObject();
 504
 505         StatusCode statusCode = statusCodeBuilder.buildObject();
 506         statusCode.setValue(DatatypeHelper.safeTrimOrNullString(topLevelCode));
 507         status.setStatusCode(statusCode);
 508
 509         if (secondLevelCode != null) {
 510             StatusCode secondLevelStatusCode = statusCodeBuilder.buildObject();
 511             secondLevelStatusCode.setValue(DatatypeHelper.safeTrimOrNullString(secondLevelCode));
 512             statusCode.setStatusCode(secondLevelStatusCode);
 513         }
 514
 515         if (failureMessage != null) {
 516             StatusMessage msg = statusMessageBuilder.buildObject();
 517             msg.setMessage(failureMessage);
 518             status.setStatusMessage(msg);
 519         }
 520
 521         return status;
 522     }
 523
 524     /**
 525      * Builds the SAML subject for the user for the service provider.
 526      *
 527      * @param requestContext current request context
 528      * @param confirmationMethod subject confirmation method used for the subject
 529      * @param issueInstant instant the subject confirmation data should reflect for issuance
 530      *
 531      * @return SAML subject for the user for the service provider
 532      *
 533      * @throws ProfileException thrown if a NameID can not be created either because there was a problem encoding the
 534      *             name ID attribute or because there are no supported name formats
 535      */
 536     protected Subject buildSubject(BaseSAML2ProfileRequestContext<?,?,?> requestContext, String confirmationMethod,
 537             DateTime issueInstant) throws ProfileException {
 538         NameID nameID = buildNameId(requestContext);
 539         requestContext.setSubjectNameID(nameID);
 540         // TODO handle encryption
 541
 542         SubjectConfirmationData confirmationData = subjectConfirmationDataBuilder.buildObject();
 543         HTTPInTransport inTransport = (HTTPInTransport) requestContext.getMessageInTransport();
 544         confirmationData.setAddress(inTransport.getPeerAddress());
 545         confirmationData.setInResponseTo(requestContext.getInboundSAMLMessageId());
 546         confirmationData.setNotOnOrAfter(issueInstant.plus(requestContext.getProfileConfiguration()
 547                 .getAssertionLifetime()));
 548
 549         Endpoint relyingPartyEndpoint = requestContext.getRelyingPartyEndpoint();
 550         if (relyingPartyEndpoint != null) {
 551             if (relyingPartyEndpoint.getResponseLocation() != null) {
 552                 confirmationData.setRecipient(relyingPartyEndpoint.getResponseLocation());
 553             } else {
 554                 confirmationData.setRecipient(relyingPartyEndpoint.getLocation());
 555             }
 556         }
 557
 558         SubjectConfirmation subjectConfirmation = subjectConfirmationBuilder.buildObject();
 559         subjectConfirmation.setMethod(confirmationMethod);
 560         subjectConfirmation.setSubjectConfirmationData(confirmationData);
 561
 562         Subject subject = subjectBuilder.buildObject();
 563         subject.setNameID(nameID);
 564         subject.getSubjectConfirmations().add(subjectConfirmation);
 565
 566         return subject;
 567     }
 568
 569     /**
 570      * Builds a NameID appropriate for this request. NameIDs are built by inspecting the SAML request and metadata,
 571      * picking a name format that was requested by the relying party or is mutually supported by both the relying party
 572      * and asserting party as described in their metadata entries. Once a set of supported name formats is determined
 573      * the principals attributes are inspected for an attribute supported an attribute encoder whose category is one of
 574      * the supported name formats.
 575      *
 576      * @param requestContext current request context
 577      *
 578      * @return the NameID appropriate for this request
 579      *
 580      * @throws ProfileException thrown if a NameID can not be created either because there was a problem encoding the
 581      *             name ID attribute or because there are no supported name formats
 582      */
 583     protected NameID buildNameId(BaseSAML2ProfileRequestContext<?,?,?> requestContext) throws ProfileException {
 584         if (log.isDebugEnabled()) {
 585             log.debug("Building assertion NameID for principal/relying party:" + requestContext.getPrincipalName()
 586                     + "/" + requestContext.getRelyingPartyEntityId());
 587         }
 588         Map<String, BaseAttribute> principalAttributes = requestContext.getPrincipalAttributes();
 589         List<String> supportedNameFormats = getNameFormats(requestContext);
 590
 591         if (log.isDebugEnabled()) {
 592             log.debug("Supported NameID formats: " + supportedNameFormats);
 593         }
 594
 595         if (principalAttributes == null || supportedNameFormats == null) {
 596             log.error("No attributes for principal " + requestContext.getPrincipalName()
 597                     + " support constructions of NameID");
 598             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, StatusCode.INVALID_NAMEID_POLICY_URI,
 599                     "Unable to construct NameID"));
 600             throw new ProfileException("No principal attributes support NameID construction");
 601         }
 602
 603         try {
 604             SAML2NameIDAttributeEncoder nameIdEncoder;
 605             for (BaseAttribute<?> attribute : principalAttributes.values()) {
 606                 for (AttributeEncoder encoder : attribute.getEncoders()) {
 607                     if (encoder instanceof SAML2NameIDAttributeEncoder) {
 608                         nameIdEncoder = (SAML2NameIDAttributeEncoder) encoder;
 609                         if (supportedNameFormats.contains(nameIdEncoder.getNameFormat())) {
 610                             if (log.isDebugEnabled()) {
 611                                 log.debug("Using attribute " + attribute.getId() + " suppoting NameID format "
 612                                         + nameIdEncoder.getNameFormat() + " to create the NameID for principal "
 613                                         + requestContext.getPrincipalName());
 614                             }
 615                             return nameIdEncoder.encode(attribute);
 616                         }
 617                     }
 618                 }
 619             }
 620             log.error("No principal attribute supported encoding into a supported name ID format.");
 621             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, null, "Unable to construct NameID"));
 622             throw new ProfileException("No principal attribute supported encoding into a supported name ID format.");
 623         } catch (AttributeEncodingException e) {
 624             log.error("Unable to encode NameID attribute", e);
 625             requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI, null, "Unable to construct NameID"));
 626             throw new ProfileException("Unable to encode NameID attribute", e);
 627         }
 628     }
 629
 630     /**
 631      * Gets the NameID format to use when creating NameIDs for the relying party.
 632      *
 633      * @param requestContext current request context
 634      *
 635      * @return list of nameID formats that may be used with the relying party
 636      *
 637      * @throws ProfileException thrown if there is a problem determing the NameID format to use
 638      */
 639     protected List<String> getNameFormats(BaseSAML2ProfileRequestContext<?,?,?> requestContext) throws ProfileException {
 640         ArrayList<String> nameFormats = new ArrayList<String>();
 641
 642         List<String> assertingPartySupportedFormats = getEntitySupportedFormats(requestContext
 643                 .getAssertingPartyRoleMetadata());
 644
 645         String nameFormat = null;
 646         if (requestContext.getInboundSAMLMessage() instanceof AuthnRequest) {
 647             AuthnRequest authnRequest = (AuthnRequest) requestContext.getInboundSAMLMessage();
 648             if (authnRequest.getNameIDPolicy() != null && !DatatypeHelper.isEmpty(nameFormat)) {
 649                 nameFormat = authnRequest.getNameIDPolicy().getFormat();
 650                 if (assertingPartySupportedFormats.contains(nameFormat)) {
 651                     nameFormats.add(nameFormat);
 652                 } else {
 653                     requestContext.setFailureStatus(buildStatus(StatusCode.RESPONDER_URI,
 654                             StatusCode.INVALID_NAMEID_POLICY_URI, "Format not supported: " + nameFormat));
 655                     throw new ProfileException("NameID format required by relying party is not supported");
 656                 }
 657             }
 658         }
 659
 660         if (nameFormats.isEmpty()) {
 661             List<String> relyingPartySupportedFormats = getEntitySupportedFormats(requestContext
 662                     .getRelyingPartyRoleMetadata());
 663
 664             assertingPartySupportedFormats.retainAll(relyingPartySupportedFormats);
 665             nameFormats.addAll(assertingPartySupportedFormats);
 666         }
 667         if (nameFormats.isEmpty()) {
 668             nameFormats.add("urn:oasis:names:tc:SAML:2.0:nameid-format:unspecified");
 669         }
 670
 671         return nameFormats;
 672     }
 673
 674     /**
 675      * Gets the list of NameID formats supported for a given role.
 676      *
 677      * @param role the role to get the list of supported NameID formats
 678      *
 679      * @return list of supported NameID formats
 680      */
 681     protected List<String> getEntitySupportedFormats(RoleDescriptor role) {
 682         List<NameIDFormat> nameIDFormats = null;
 683
 684         if (role instanceof SSODescriptor) {
 685             nameIDFormats = ((SSODescriptor) role).getNameIDFormats();
 686         } else if (role instanceof AuthnAuthorityDescriptor) {
 687             nameIDFormats = ((AuthnAuthorityDescriptor) role).getNameIDFormats();
 688         } else if (role instanceof PDPDescriptor) {
 689             nameIDFormats = ((PDPDescriptor) role).getNameIDFormats();
 690         } else if (role instanceof AttributeAuthorityDescriptor) {
 691             nameIDFormats = ((AttributeAuthorityDescriptor) role).getNameIDFormats();
 692         }
 693
 694         ArrayList<String> supportedFormats = new ArrayList<String>();
 695         if (nameIDFormats != null) {
 696             for (NameIDFormat format : nameIDFormats) {
 697                 supportedFormats.add(format.getFormat());
 698             }
 699         }
 700
 701         return supportedFormats;
 702     }
 703
 704     /**
 705      * Constructs an SAML response message carrying a request error.
 706      *
 707      * @param requestContext current request context
 708      *
 709      * @return the constructed error response
 710      */
 711     protected Response buildErrorResponse(BaseSAML2ProfileRequestContext<?,?,?> requestContext) {
 712         Response samlResponse = responseBuilder.buildObject();
 713         samlResponse.setIssueInstant(new DateTime());
 714         populateStatusResponse(requestContext, samlResponse);
 715
 716         samlResponse.setStatus(requestContext.getFailureStatus());
 717
 718         return samlResponse;
 719     }
 720
 721     /**
 722      * Writes an aduit log entry indicating the successful response to the attribute request.
 723      *
 724      * @param context current request context
 725      */
 726     protected void writeAuditLogEntry(BaseSAML2ProfileRequestContext<?,?,?> context) {
 727         AuditLogEntry auditLogEntry = new AuditLogEntry();
 728         auditLogEntry.setMessageProfile(getProfileId());
 729         auditLogEntry.setPrincipalAuthenticationMethod(context.getPrincipalAuthenticationMethod());
 730         auditLogEntry.setPrincipalName(context.getPrincipalName());
 731         auditLogEntry.setAssertingPartyId(context.getAssertingPartyEntityId());
 732         auditLogEntry.setRelyingPartyId(context.getRelyingPartyEntityId());
 733         auditLogEntry.setRequestBinding(getMessageDecoder().getBindingURI());
 734         auditLogEntry.setRequestId(context.getInboundSAMLMessageId());
 735         auditLogEntry.setResponseBinding(getMessageEncoder().getBindingURI());
 736         auditLogEntry.setResponseId(context.getOutboundSAMLMessageId());
 737         if (context.getReleasedPrincipalAttributeIds() != null) {
 738             auditLogEntry.getReleasedAttributes().addAll(context.getReleasedPrincipalAttributeIds());
 739         }
 740         getAduitLog().log(Level.CRITICAL, auditLogEntry);
 741     }
 742 }