shibsp/attribute/resolver/impl/QueryAttributeResolver.cpp

   1 /**
   2  * Licensed to the University Corporation for Advanced Internet
   3  * Development, Inc. (UCAID) under one or more contributor license
   4  * agreements. See the NOTICE file distributed with this work for
   5  * additional information regarding copyright ownership.
   6  *
   7  * UCAID licenses this file to you under the Apache License,
   8  * Version 2.0 (the "License"); you may not use this file except
   9  * in compliance with the License. You may obtain a copy of the
  10  * License at
  11  *
  12  * http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing,
  15  * software distributed under the License is distributed on an
  16  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
  17  * either express or implied. See the License for the specific
  18  * language governing permissions and limitations under the License.
  19  */
  20
  21 /**
  22  * QueryAttributeResolver.cpp
  23  *
  24  * AttributeResolver based on SAML queries.
  25  */
  26
  27 #include "internal.h"
  28 #include "Application.h"
  29 #include "ServiceProvider.h"
  30 #include "SessionCache.h"
  31 #include "attribute/SimpleAttribute.h"
  32 #include "attribute/filtering/AttributeFilter.h"
  33 #include "attribute/filtering/BasicFilteringContext.h"
  34 #include "attribute/resolver/AttributeExtractor.h"
  35 #include "attribute/resolver/AttributeResolver.h"
  36 #include "attribute/resolver/ResolutionContext.h"
  37 #include "binding/SOAPClient.h"
  38 #include "metadata/MetadataProviderCriteria.h"
  39 #include "security/SecurityPolicy.h"
  40 #include "security/SecurityPolicyProvider.h"
  41 #include "util/SPConstants.h"
  42
  43 #include <boost/iterator/indirect_iterator.hpp>
  44 #include <boost/ptr_container/ptr_vector.hpp>
  45 #include <saml/exceptions.h>
  46 #include <saml/saml1/binding/SAML1SOAPClient.h>
  47 #include <saml/saml1/core/Assertions.h>
  48 #include <saml/saml1/core/Protocols.h>
  49 #include <saml/saml2/binding/SAML2SOAPClient.h>
  50 #include <saml/saml2/core/Protocols.h>
  51 #include <saml/saml2/metadata/Metadata.h>
  52 #include <saml/saml2/metadata/MetadataCredentialCriteria.h>
  53 #include <saml/saml2/metadata/MetadataProvider.h>
  54 #include <xmltooling/XMLToolingConfig.h>
  55 #include <xmltooling/util/NDC.h>
  56 #include <xmltooling/util/URLEncoder.h>
  57 #include <xmltooling/util/XMLHelper.h>
  58 #include <xercesc/util/XMLUniDefs.hpp>
  59
  60 using namespace shibsp;
  61 using namespace opensaml::saml1;
  62 using namespace opensaml::saml1p;
  63 using namespace opensaml::saml2;
  64 using namespace opensaml::saml2p;
  65 using namespace opensaml::saml2md;
  66 using namespace opensaml;
  67 using namespace xmltooling;
  68 using namespace boost;
  69 using namespace std;
  70
  71 namespace shibsp {
  72
  73     class SHIBSP_DLLLOCAL QueryContext : public ResolutionContext
  74     {
  75     public:
  76         QueryContext(const Application& application, const Session& session)
  77                 : m_query(true), m_app(application), m_session(&session), m_metadata(nullptr), m_entity(nullptr), m_nameid(nullptr) {
  78             m_protocol = XMLString::transcode(session.getProtocol());
  79             m_class = XMLString::transcode(session.getAuthnContextClassRef());
  80             m_decl = XMLString::transcode(session.getAuthnContextDeclRef());
  81         }
  82
  83         QueryContext(
  84             const Application& application,
  85             const EntityDescriptor* issuer,
  86             const XMLCh* protocol,
  87             const NameID* nameid=nullptr,
  88             const XMLCh* authncontext_class=nullptr,
  89             const XMLCh* authncontext_decl=nullptr,
  90             const vector<const opensaml::Assertion*>* tokens=nullptr
  91             ) : m_query(true), m_app(application), m_session(nullptr), m_metadata(nullptr), m_entity(issuer),
  92                 m_protocol(protocol), m_nameid(nameid), m_class(authncontext_class), m_decl(authncontext_decl) {
  93
  94             if (tokens) {
  95                 for (vector<const opensaml::Assertion*>::const_iterator t = tokens->begin(); t!=tokens->end(); ++t) {
  96                     const saml2::Assertion* token2 = dynamic_cast<const saml2::Assertion*>(*t);
  97                     if (token2 && !token2->getAttributeStatements().empty()) {
  98                         m_query = false;
  99                     }
 100                     else {
 101                         const saml1::Assertion* token1 = dynamic_cast<const saml1::Assertion*>(*t);
 102                         if (token1 && !token1->getAttributeStatements().empty()) {
 103                             m_query = false;
 104                         }
 105                     }
 106                 }
 107             }
 108         }
 109
 110         ~QueryContext() {
 111             if (m_session) {
 112                 XMLString::release((XMLCh**)&m_protocol);
 113                 XMLString::release((XMLCh**)&m_class);
 114                 XMLString::release((XMLCh**)&m_decl);
 115             }
 116             if (m_metadata)
 117                 m_metadata->unlock();
 118             for_each(m_attributes.begin(), m_attributes.end(), xmltooling::cleanup<shibsp::Attribute>());
 119             for_each(m_assertions.begin(), m_assertions.end(), xmltooling::cleanup<opensaml::Assertion>());
 120         }
 121
 122         bool doQuery() const {
 123             return m_query;
 124         }
 125
 126         const Application& getApplication() const {
 127             return m_app;
 128         }
 129         const EntityDescriptor* getEntityDescriptor() const {
 130             if (m_entity)
 131                 return m_entity;
 132             if (m_session && m_session->getEntityID()) {
 133                 m_metadata = m_app.getMetadataProvider(false);
 134                 if (m_metadata) {
 135                     m_metadata->lock();
 136                     return m_entity = m_metadata->getEntityDescriptor(MetadataProviderCriteria(m_app, m_session->getEntityID())).first;
 137                 }
 138             }
 139             return nullptr;
 140         }
 141         const XMLCh* getProtocol() const {
 142             return m_protocol;
 143         }
 144         const NameID* getNameID() const {
 145             return m_session ? m_session->getNameID() : m_nameid;
 146         }
 147         const XMLCh* getClassRef() const {
 148             return m_class;
 149         }
 150         const XMLCh* getDeclRef() const {
 151             return m_decl;
 152         }
 153         const Session* getSession() const {
 154             return m_session;
 155         }
 156         vector<shibsp::Attribute*>& getResolvedAttributes() {
 157             return m_attributes;
 158         }
 159         vector<opensaml::Assertion*>& getResolvedAssertions() {
 160             return m_assertions;
 161         }
 162
 163     private:
 164         bool m_query;
 165         const Application& m_app;
 166         const Session* m_session;
 167         mutable MetadataProvider* m_metadata;
 168         mutable const EntityDescriptor* m_entity;
 169         const XMLCh* m_protocol;
 170         const NameID* m_nameid;
 171         const XMLCh* m_class;
 172         const XMLCh* m_decl;
 173         vector<shibsp::Attribute*> m_attributes;
 174         vector<opensaml::Assertion*> m_assertions;
 175     };
 176
 177     class SHIBSP_DLLLOCAL QueryResolver : public AttributeResolver
 178     {
 179     public:
 180         QueryResolver(const DOMElement* e);
 181         ~QueryResolver() {}
 182
 183         Lockable* lock() {return this;}
 184         void unlock() {}
 185
 186         ResolutionContext* createResolutionContext(
 187             const Application& application,
 188             const EntityDescriptor* issuer,
 189             const XMLCh* protocol,
 190             const NameID* nameid=nullptr,
 191             const XMLCh* authncontext_class=nullptr,
 192             const XMLCh* authncontext_decl=nullptr,
 193             const vector<const opensaml::Assertion*>* tokens=nullptr,
 194             const vector<shibsp::Attribute*>* attributes=nullptr
 195             ) const {
 196             return new QueryContext(application,issuer,protocol,nameid,authncontext_class,authncontext_decl,tokens);
 197         }
 198
 199         ResolutionContext* createResolutionContext(const Application& application, const Session& session) const {
 200             return new QueryContext(application,session);
 201         }
 202
 203         void resolveAttributes(ResolutionContext& ctx) const;
 204
 205         void getAttributeIds(vector<string>& attributes) const {
 206             // Nothing to do, only the extractor would actually generate them.
 207         }
 208
 209     private:
 210         void SAML1Query(QueryContext& ctx) const;
 211         void SAML2Query(QueryContext& ctx) const;
 212
 213         Category& m_log;
 214         string m_policyId;
 215         bool m_subjectMatch;
 216         ptr_vector<AttributeDesignator> m_SAML1Designators;
 217         ptr_vector<saml2::Attribute> m_SAML2Designators;
 218         vector<string> m_exceptionId;
 219     };
 220
 221     AttributeResolver* SHIBSP_DLLLOCAL QueryResolverFactory(const DOMElement* const & e)
 222     {
 223         return new QueryResolver(e);
 224     }
 225
 226     static const XMLCh exceptionId[] =  UNICODE_LITERAL_11(e,x,c,e,p,t,i,o,n,I,d);
 227     static const XMLCh policyId[] =     UNICODE_LITERAL_8(p,o,l,i,c,y,I,d);
 228     static const XMLCh subjectMatch[] = UNICODE_LITERAL_12(s,u,b,j,e,c,t,M,a,t,c,h);
 229 };
 230
 231 QueryResolver::QueryResolver(const DOMElement* e)
 232     : m_log(Category::getInstance(SHIBSP_LOGCAT".AttributeResolver.Query")),
 233         m_policyId(XMLHelper::getAttrString(e, nullptr, policyId)),
 234         m_subjectMatch(XMLHelper::getAttrBool(e, false, subjectMatch))
 235 {
 236 #ifdef _DEBUG
 237     xmltooling::NDC ndc("QueryResolver");
 238 #endif
 239
 240     DOMElement* child = XMLHelper::getFirstChildElement(e);
 241     while (child) {
 242         try {
 243             if (XMLHelper::isNodeNamed(child, samlconstants::SAML20_NS, saml2::Attribute::LOCAL_NAME)) {
 244                 auto_ptr<XMLObject> obj(saml2::AttributeBuilder::buildOneFromElement(child));
 245                 saml2::Attribute* down = dynamic_cast<saml2::Attribute*>(obj.get());
 246                 if (down) {
 247                     m_SAML2Designators.push_back(down);
 248                     obj.release();
 249                 }
 250             }
 251             else if (XMLHelper::isNodeNamed(child, samlconstants::SAML1_NS, AttributeDesignator::LOCAL_NAME)) {
 252                 auto_ptr<XMLObject> obj(AttributeDesignatorBuilder::buildOneFromElement(child));
 253                 AttributeDesignator* down = dynamic_cast<AttributeDesignator*>(obj.get());
 254                 if (down) {
 255                     m_SAML1Designators.push_back(down);
 256                     obj.release();
 257                 }
 258             }
 259         }
 260         catch (exception& ex) {
 261             m_log.error("exception loading attribute designator: %s", ex.what());
 262         }
 263         child = XMLHelper::getNextSiblingElement(child);
 264     }
 265
 266     string exid(XMLHelper::getAttrString(e, nullptr, exceptionId));
 267     if (!exid.empty())
 268         m_exceptionId.push_back(exid);
 269 }
 270
 271 void QueryResolver::SAML1Query(QueryContext& ctx) const
 272 {
 273 #ifdef _DEBUG
 274     xmltooling::NDC ndc("query");
 275 #endif
 276
 277     int version = XMLString::equals(ctx.getProtocol(), samlconstants::SAML11_PROTOCOL_ENUM) ? 1 : 0;
 278     const AttributeAuthorityDescriptor* AA =
 279         find_if(ctx.getEntityDescriptor()->getAttributeAuthorityDescriptors(), isValidForProtocol(ctx.getProtocol()));
 280     if (!AA) {
 281         m_log.warn("no SAML 1.%d AttributeAuthority role found in metadata", version);
 282         return;
 283     }
 284
 285     const Application& application = ctx.getApplication();
 286     const PropertySet* relyingParty = application.getRelyingParty(ctx.getEntityDescriptor());
 287
 288     // Locate policy key.
 289     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 290
 291     // Set up policy and SOAP client.
 292     scoped_ptr<SecurityPolicy> policy(
 293         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, nullptr, policyId)
 294         );
 295     policy->getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 296     MetadataCredentialCriteria mcc(*AA);
 297     shibsp::SOAPClient soaper(*policy);
 298
 299     auto_ptr_XMLCh binding(samlconstants::SAML1_BINDING_SOAP);
 300     auto_ptr<saml1p::Response> response;
 301     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 302     for (indirect_iterator<vector<AttributeService*>::const_iterator> ep = make_indirect_iterator(endpoints.begin());
 303             !response.get() && ep != make_indirect_iterator(endpoints.end()); ++ep) {
 304         if (!XMLString::equals(ep->getBinding(), binding.get()) || !ep->getLocation())
 305             continue;
 306         auto_ptr_char loc(ep->getLocation());
 307         try {
 308             NameIdentifier* nameid = NameIdentifierBuilder::buildNameIdentifier();
 309             nameid->setName(ctx.getNameID()->getName());
 310             nameid->setFormat(ctx.getNameID()->getFormat());
 311             nameid->setNameQualifier(ctx.getNameID()->getNameQualifier());
 312             saml1::Subject* subject = saml1::SubjectBuilder::buildSubject();
 313             subject->setNameIdentifier(nameid);
 314             saml1p::AttributeQuery* query = saml1p::AttributeQueryBuilder::buildAttributeQuery();
 315             query->setSubject(subject);
 316             query->setResource(relyingParty->getXMLString("entityID").second);
 317             for (ptr_vector<AttributeDesignator>::const_iterator ad = m_SAML1Designators.begin(); ad != m_SAML1Designators.end(); ++ad) {
 318                 auto_ptr<AttributeDesignator> adwrapper(ad->cloneAttributeDesignator());
 319                 query->getAttributeDesignators().push_back(adwrapper.get());
 320                 adwrapper.release();
 321             }
 322             Request* request = RequestBuilder::buildRequest();
 323             request->setAttributeQuery(query);
 324             request->setMinorVersion(version);
 325
 326             SAML1SOAPClient client(soaper, false);
 327             client.sendSAML(request, application.getId(), mcc, loc.get());
 328             response.reset(client.receiveSAML());
 329         }
 330         catch (exception& ex) {
 331             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 332             soaper.reset();
 333         }
 334     }
 335
 336     if (!response.get()) {
 337         m_log.error("unable to obtain a SAML response from attribute authority");
 338         throw BindingException("Unable to obtain a SAML response from attribute authority.");
 339     }
 340     else if (!response->getStatus() || !response->getStatus()->getStatusCode() || response->getStatus()->getStatusCode()->getValue()==nullptr ||
 341             *(response->getStatus()->getStatusCode()->getValue()) != saml1p::StatusCode::SUCCESS) {
 342         m_log.error("attribute authority returned a SAML error");
 343         throw FatalProfileException("Attribute authority returned a SAML error.");
 344     }
 345
 346     const vector<saml1::Assertion*>& assertions = const_cast<const saml1p::Response*>(response.get())->getAssertions();
 347     if (assertions.empty()) {
 348         m_log.warn("response from attribute authority was empty");
 349         return;
 350     }
 351     else if (assertions.size() > 1) {
 352         m_log.warn("simple resolver only supports one assertion in the query response");
 353     }
 354
 355     saml1::Assertion* newtoken = assertions.front();
 356
 357     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 358     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 359         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 360         throw SecurityPolicyException("Rejected unsigned assertion based on local policy.");
 361     }
 362
 363     try {
 364         // We're going to insist that the assertion issuer is the same as the peer.
 365         // Reset the policy's message bits and extract them from the assertion.
 366         policy->reset(true);
 367         policy->setMessageID(newtoken->getAssertionID());
 368         policy->setIssueInstant(newtoken->getIssueInstantEpoch());
 369         policy->setIssuer(newtoken->getIssuer());
 370         policy->evaluate(*newtoken);
 371
 372         // Now we can check the security status of the policy.
 373         if (!policy->isAuthenticated())
 374             throw SecurityPolicyException("Security of SAML 1.x query result not established.");
 375     }
 376     catch (exception& ex) {
 377         m_log.error("assertion failed policy validation: %s", ex.what());
 378         throw;
 379     }
 380
 381     newtoken->detach();
 382     response.release();  // detach blows away the Response
 383     ctx.getResolvedAssertions().push_back(newtoken);
 384
 385     // Finally, extract and filter the result.
 386     try {
 387         AttributeExtractor* extractor = application.getAttributeExtractor();
 388         if (extractor) {
 389             Locker extlocker(extractor);
 390             const vector<saml1::AttributeStatement*>& statements = const_cast<const saml1::Assertion*>(newtoken)->getAttributeStatements();
 391             for (indirect_iterator<vector<saml1::AttributeStatement*>::const_iterator> s = make_indirect_iterator(statements.begin());
 392                     s != make_indirect_iterator(statements.end()); ++s) {
 393                 if (m_subjectMatch) {
 394                     // Check for subject match.
 395                     const NameIdentifier* respName = s->getSubject() ? s->getSubject()->getNameIdentifier() : nullptr;
 396                     if (!respName || !XMLString::equals(respName->getName(), ctx.getNameID()->getName()) ||
 397                         !XMLString::equals(respName->getFormat(), ctx.getNameID()->getFormat()) ||
 398                         !XMLString::equals(respName->getNameQualifier(), ctx.getNameID()->getNameQualifier())) {
 399                         if (respName)
 400                             m_log.warnStream() << "ignoring AttributeStatement without strongly matching NameIdentifier in Subject: " <<
 401                                 *respName << logging::eol;
 402                         else
 403                             m_log.warn("ignoring AttributeStatement without NameIdentifier in Subject");
 404                         continue;
 405                     }
 406                 }
 407                 extractor->extractAttributes(application, AA, *s, ctx.getResolvedAttributes());
 408             }
 409         }
 410
 411         AttributeFilter* filter = application.getAttributeFilter();
 412         if (filter) {
 413             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 414             Locker filtlocker(filter);
 415             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 416         }
 417     }
 418     catch (exception& ex) {
 419         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 420         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 421         ctx.getResolvedAttributes().clear();
 422         throw;
 423     }
 424 }
 425
 426 void QueryResolver::SAML2Query(QueryContext& ctx) const
 427 {
 428 #ifdef _DEBUG
 429     xmltooling::NDC ndc("query");
 430 #endif
 431
 432     const AttributeAuthorityDescriptor* AA =
 433         find_if(ctx.getEntityDescriptor()->getAttributeAuthorityDescriptors(), isValidForProtocol(samlconstants::SAML20P_NS));
 434     if (!AA) {
 435         m_log.warn("no SAML 2 AttributeAuthority role found in metadata");
 436         return;
 437     }
 438
 439     const Application& application = ctx.getApplication();
 440     const PropertySet* relyingParty = application.getRelyingParty(ctx.getEntityDescriptor());
 441     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 442     pair<bool,const char*> encryption = relyingParty->getString("encryption");
 443
 444     // Locate policy key.
 445     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 446
 447     // Set up policy and SOAP client.
 448     scoped_ptr<SecurityPolicy> policy(
 449         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, nullptr, policyId)
 450         );
 451     policy->getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 452     MetadataCredentialCriteria mcc(*AA);
 453     shibsp::SOAPClient soaper(*policy);
 454
 455     auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
 456     auto_ptr<saml2p::StatusResponseType> srt;
 457     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 458     for (indirect_iterator<vector<AttributeService*>::const_iterator> ep = make_indirect_iterator(endpoints.begin());
 459             !srt.get() && ep != make_indirect_iterator(endpoints.end()); ++ep) {
 460         if (!XMLString::equals(ep->getBinding(), binding.get())  || !ep->getLocation())
 461             continue;
 462         auto_ptr_char loc(ep->getLocation());
 463         try {
 464             auto_ptr<saml2::Subject> subject(saml2::SubjectBuilder::buildSubject());
 465
 466             // Encrypt the NameID?
 467             if (encryption.first && (!strcmp(encryption.second, "true") || !strcmp(encryption.second, "back"))) {
 468                 auto_ptr<EncryptedID> encrypted(EncryptedIDBuilder::buildEncryptedID());
 469                 encrypted->encrypt(
 470                     *ctx.getNameID(),
 471                     *(application.getMetadataProvider()),
 472                     mcc,
 473                     false,
 474                     relyingParty->getXMLString("encryptionAlg").second
 475                     );
 476                 subject->setEncryptedID(encrypted.get());
 477                 encrypted.release();
 478             }
 479             else {
 480                 auto_ptr<NameID> namewrapper(ctx.getNameID()->cloneNameID());
 481                 subject->setNameID(namewrapper.get());
 482                 namewrapper.release();
 483             }
 484
 485             saml2p::AttributeQuery* query = saml2p::AttributeQueryBuilder::buildAttributeQuery();
 486             query->setSubject(subject.release());
 487             Issuer* iss = IssuerBuilder::buildIssuer();
 488             iss->setName(relyingParty->getXMLString("entityID").second);
 489             query->setIssuer(iss);
 490             for (ptr_vector<saml2::Attribute>::const_iterator ad = m_SAML2Designators.begin(); ad != m_SAML2Designators.end(); ++ad) {
 491                 auto_ptr<saml2::Attribute> adwrapper(ad->cloneAttribute());
 492                 query->getAttributes().push_back(adwrapper.get());
 493                 adwrapper.release();
 494             }
 495
 496             SAML2SOAPClient client(soaper, false);
 497             client.sendSAML(query, application.getId(), mcc, loc.get());
 498             srt.reset(client.receiveSAML());
 499         }
 500         catch (exception& ex) {
 501             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 502             soaper.reset();
 503         }
 504     }
 505
 506     if (!srt.get()) {
 507         m_log.error("unable to obtain a SAML response from attribute authority");
 508         throw BindingException("Unable to obtain a SAML response from attribute authority.");
 509     }
 510
 511     saml2p::Response* response = dynamic_cast<saml2p::Response*>(srt.get());
 512     if (!response) {
 513         m_log.error("message was not a samlp:Response");
 514         throw FatalProfileException("Attribute authority returned an unrecognized message.");
 515     }
 516     else if (!response->getStatus() || !response->getStatus()->getStatusCode() ||
 517             !XMLString::equals(response->getStatus()->getStatusCode()->getValue(), saml2p::StatusCode::SUCCESS)) {
 518         m_log.error("attribute authority returned a SAML error");
 519         throw FatalProfileException("Attribute authority returned a SAML error.");
 520     }
 521
 522     saml2::Assertion* newtoken = nullptr;
 523     auto_ptr<saml2::Assertion> newtokenwrapper;
 524     const vector<saml2::Assertion*>& assertions = const_cast<const saml2p::Response*>(response)->getAssertions();
 525     if (assertions.empty()) {
 526         // Check for encryption.
 527         const vector<saml2::EncryptedAssertion*>& encassertions = const_cast<const saml2p::Response*>(response)->getEncryptedAssertions();
 528         if (encassertions.empty()) {
 529             m_log.warn("response from attribute authority was empty");
 530             return;
 531         }
 532         else if (encassertions.size() > 1) {
 533             m_log.warn("simple resolver only supports one assertion in the query response");
 534         }
 535
 536         CredentialResolver* cr = application.getCredentialResolver();
 537         if (!cr) {
 538             m_log.warn("found encrypted assertion, but no CredentialResolver was available");
 539             throw FatalProfileException("Assertion was encrypted, but no decryption credentials are available.");
 540         }
 541
 542         // With this flag on, we block unauthenticated ciphertext when decrypting,
 543         // unless the protocol was authenticated.
 544         pair<bool,bool> authenticatedCipher = application.getBool("requireAuthenticatedCipher");
 545         if (policy->isAuthenticated())
 546             authenticatedCipher.second = false;
 547
 548         // Attempt to decrypt it.
 549         try {
 550             Locker credlocker(cr);
 551             auto_ptr<XMLObject> tokenwrapper(
 552                 encassertions.front()->decrypt(
 553                     *cr, relyingParty->getXMLString("entityID").second, &mcc, authenticatedCipher.first && authenticatedCipher.second
 554                     )
 555                 );
 556             newtoken = dynamic_cast<saml2::Assertion*>(tokenwrapper.get());
 557             if (newtoken) {
 558                 tokenwrapper.release();
 559                 newtokenwrapper.reset(newtoken);
 560                 if (m_log.isDebugEnabled())
 561                     m_log.debugStream() << "decrypted Assertion: " << *newtoken << logging::eol;
 562             }
 563         }
 564         catch (exception& ex) {
 565             m_log.error(ex.what());
 566             throw;
 567         }
 568     }
 569     else {
 570         if (assertions.size() > 1)
 571             m_log.warn("simple resolver only supports one assertion in the query response");
 572         newtoken = assertions.front();
 573     }
 574
 575     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 576         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 577         throw SecurityPolicyException("Rejected unsigned assertion based on local policy.");
 578     }
 579
 580     try {
 581         // We're going to insist that the assertion issuer is the same as the peer.
 582         // Reset the policy's message bits and extract them from the assertion.
 583         policy->reset(true);
 584         policy->setMessageID(newtoken->getID());
 585         policy->setIssueInstant(newtoken->getIssueInstantEpoch());
 586         policy->setIssuer(newtoken->getIssuer());
 587         policy->evaluate(*newtoken);
 588
 589         // Now we can check the security status of the policy.
 590         if (!policy->isAuthenticated())
 591             throw SecurityPolicyException("Security of SAML 2.0 query result not established.");
 592
 593         if (m_subjectMatch) {
 594             // Check for subject match.
 595             auto_ptr<NameID> nameIDwrapper;
 596             NameID* respName = newtoken->getSubject() ? newtoken->getSubject()->getNameID() : nullptr;
 597             if (!respName) {
 598                 // Check for encryption.
 599                 EncryptedID* encname = newtoken->getSubject() ? newtoken->getSubject()->getEncryptedID() : nullptr;
 600                 if (encname) {
 601                     CredentialResolver* cr=application.getCredentialResolver();
 602                     if (!cr)
 603                         m_log.warn("found EncryptedID, but no CredentialResolver was available");
 604                     else {
 605                         Locker credlocker(cr);
 606                         auto_ptr<XMLObject> decryptedID(encname->decrypt(*cr, relyingParty->getXMLString("entityID").second, &mcc));
 607                         respName = dynamic_cast<NameID*>(decryptedID.get());
 608                         if (respName) {
 609                             decryptedID.release();
 610                             nameIDwrapper.reset(respName);
 611                             if (m_log.isDebugEnabled())
 612                                 m_log.debugStream() << "decrypted NameID: " << *respName << logging::eol;
 613                         }
 614                     }
 615                 }
 616             }
 617
 618             if (!respName || !XMLString::equals(respName->getName(), ctx.getNameID()->getName()) ||
 619                 !XMLString::equals(respName->getFormat(), ctx.getNameID()->getFormat()) ||
 620                 !XMLString::equals(respName->getNameQualifier(), ctx.getNameID()->getNameQualifier()) ||
 621                 !XMLString::equals(respName->getSPNameQualifier(), ctx.getNameID()->getSPNameQualifier())) {
 622                 if (respName)
 623                     m_log.warnStream() << "ignoring Assertion without strongly matching NameID in Subject: " <<
 624                         *respName << logging::eol;
 625                 else
 626                     m_log.warn("ignoring Assertion without NameID in Subject");
 627                 return;
 628             }
 629         }
 630     }
 631     catch (exception& ex) {
 632         m_log.error("assertion failed policy validation: %s", ex.what());
 633         throw;
 634     }
 635
 636     // If the token's embedded, detach it.
 637     if (!newtokenwrapper.get()) {
 638         newtoken->detach();
 639         srt.release();  // detach blows away the Response, so avoid a double free
 640         newtokenwrapper.reset(newtoken);
 641     }
 642     ctx.getResolvedAssertions().push_back(newtoken);
 643     newtokenwrapper.release();
 644
 645     // Finally, extract and filter the result.
 646     try {
 647         AttributeExtractor* extractor = application.getAttributeExtractor();
 648         if (extractor) {
 649             Locker extlocker(extractor);
 650             extractor->extractAttributes(application, AA, *newtoken, ctx.getResolvedAttributes());
 651         }
 652
 653         AttributeFilter* filter = application.getAttributeFilter();
 654         if (filter) {
 655             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 656             Locker filtlocker(filter);
 657             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 658         }
 659     }
 660     catch (exception& ex) {
 661         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 662         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 663         ctx.getResolvedAttributes().clear();
 664         throw;
 665     }
 666 }
 667
 668 void QueryResolver::resolveAttributes(ResolutionContext& ctx) const
 669 {
 670 #ifdef _DEBUG
 671     xmltooling::NDC ndc("resolveAttributes");
 672 #endif
 673
 674     QueryContext& qctx = dynamic_cast<QueryContext&>(ctx);
 675     if (!qctx.doQuery()) {
 676         m_log.debug("found AttributeStatement in input to new session, skipping query");
 677         return;
 678     }
 679
 680     try {
 681         if (qctx.getNameID() && qctx.getEntityDescriptor()) {
 682             if (XMLString::equals(qctx.getProtocol(), samlconstants::SAML20P_NS)) {
 683                 m_log.debug("attempting SAML 2.0 attribute query");
 684                 SAML2Query(qctx);
 685             }
 686             else if (XMLString::equals(qctx.getProtocol(), samlconstants::SAML11_PROTOCOL_ENUM) ||
 687                     XMLString::equals(qctx.getProtocol(), samlconstants::SAML10_PROTOCOL_ENUM)) {
 688                 m_log.debug("attempting SAML 1.x attribute query");
 689                 SAML1Query(qctx);
 690             }
 691             else {
 692                 m_log.info("SSO protocol does not allow for attribute query");
 693             }
 694         }
 695         else {
 696             m_log.warn("can't attempt attribute query, either no NameID or no metadata to use");
 697         }
 698     }
 699     catch (exception& ex) {
 700         // Already logged.
 701         if (!m_exceptionId.empty()) {
 702             auto_ptr<SimpleAttribute> attr(new SimpleAttribute(m_exceptionId));
 703             attr->getValues().push_back(XMLToolingConfig::getConfig().getURLEncoder()->encode(ex.what()));
 704             qctx.getResolvedAttributes().push_back(attr.get());
 705             attr.release();
 706         }
 707     }
 708 }