shibsp/attribute/resolver/impl/QueryAttributeResolver.cpp

   1 /*
   2  *  Copyright 2001-2010 Internet2
   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 /**
  18  * QueryAttributeResolver.cpp
  19  *
  20  * AttributeResolver based on SAML queries.
  21  */
  22
  23 #include "internal.h"
  24 #include "Application.h"
  25 #include "ServiceProvider.h"
  26 #include "SessionCache.h"
  27 #include "attribute/SimpleAttribute.h"
  28 #include "attribute/filtering/AttributeFilter.h"
  29 #include "attribute/filtering/BasicFilteringContext.h"
  30 #include "attribute/resolver/AttributeExtractor.h"
  31 #include "attribute/resolver/AttributeResolver.h"
  32 #include "attribute/resolver/ResolutionContext.h"
  33 #include "binding/SOAPClient.h"
  34 #include "metadata/MetadataProviderCriteria.h"
  35 #include "security/SecurityPolicy.h"
  36 #include "security/SecurityPolicyProvider.h"
  37 #include "util/SPConstants.h"
  38
  39 #include <saml/exceptions.h>
  40 #include <saml/saml1/binding/SAML1SOAPClient.h>
  41 #include <saml/saml1/core/Assertions.h>
  42 #include <saml/saml1/core/Protocols.h>
  43 #include <saml/saml2/binding/SAML2SOAPClient.h>
  44 #include <saml/saml2/core/Protocols.h>
  45 #include <saml/saml2/metadata/Metadata.h>
  46 #include <saml/saml2/metadata/MetadataCredentialCriteria.h>
  47 #include <saml/saml2/metadata/MetadataProvider.h>
  48 #include <xmltooling/XMLToolingConfig.h>
  49 #include <xmltooling/util/NDC.h>
  50 #include <xmltooling/util/URLEncoder.h>
  51 #include <xmltooling/util/XMLHelper.h>
  52 #include <xercesc/util/XMLUniDefs.hpp>
  53
  54 using namespace shibsp;
  55 using namespace opensaml::saml1;
  56 using namespace opensaml::saml1p;
  57 using namespace opensaml::saml2;
  58 using namespace opensaml::saml2p;
  59 using namespace opensaml::saml2md;
  60 using namespace opensaml;
  61 using namespace xmltooling;
  62 using namespace std;
  63
  64 namespace shibsp {
  65
  66     class SHIBSP_DLLLOCAL QueryContext : public ResolutionContext
  67     {
  68     public:
  69         QueryContext(const Application& application, const Session& session)
  70                 : m_query(true), m_app(application), m_session(&session), m_metadata(nullptr), m_entity(nullptr), m_nameid(nullptr) {
  71             m_protocol = XMLString::transcode(session.getProtocol());
  72             m_class = XMLString::transcode(session.getAuthnContextClassRef());
  73             m_decl = XMLString::transcode(session.getAuthnContextDeclRef());
  74         }
  75
  76         QueryContext(
  77             const Application& application,
  78             const EntityDescriptor* issuer,
  79             const XMLCh* protocol,
  80             const NameID* nameid=nullptr,
  81             const XMLCh* authncontext_class=nullptr,
  82             const XMLCh* authncontext_decl=nullptr,
  83             const vector<const opensaml::Assertion*>* tokens=nullptr
  84             ) : m_query(true), m_app(application), m_session(nullptr), m_metadata(nullptr), m_entity(issuer),
  85                 m_protocol(protocol), m_nameid(nameid), m_class(authncontext_class), m_decl(authncontext_decl) {
  86
  87             if (tokens) {
  88                 for (vector<const opensaml::Assertion*>::const_iterator t = tokens->begin(); t!=tokens->end(); ++t) {
  89                     const saml2::Assertion* token2 = dynamic_cast<const saml2::Assertion*>(*t);
  90                     if (token2 && !token2->getAttributeStatements().empty()) {
  91                         m_query = false;
  92                     }
  93                     else {
  94                         const saml1::Assertion* token1 = dynamic_cast<const saml1::Assertion*>(*t);
  95                         if (token1 && !token1->getAttributeStatements().empty()) {
  96                             m_query = false;
  97                         }
  98                     }
  99                 }
 100             }
 101         }
 102
 103         ~QueryContext() {
 104             if (m_session) {
 105                 XMLString::release((XMLCh**)&m_protocol);
 106                 XMLString::release((XMLCh**)&m_class);
 107                 XMLString::release((XMLCh**)&m_decl);
 108             }
 109             if (m_metadata)
 110                 m_metadata->unlock();
 111             for_each(m_attributes.begin(), m_attributes.end(), xmltooling::cleanup<shibsp::Attribute>());
 112             for_each(m_assertions.begin(), m_assertions.end(), xmltooling::cleanup<opensaml::Assertion>());
 113         }
 114
 115         bool doQuery() const {
 116             return m_query;
 117         }
 118
 119         const Application& getApplication() const {
 120             return m_app;
 121         }
 122         const EntityDescriptor* getEntityDescriptor() const {
 123             if (m_entity)
 124                 return m_entity;
 125             if (m_session && m_session->getEntityID()) {
 126                 m_metadata = m_app.getMetadataProvider(false);
 127                 if (m_metadata) {
 128                     m_metadata->lock();
 129                     return m_entity = m_metadata->getEntityDescriptor(MetadataProviderCriteria(m_app, m_session->getEntityID())).first;
 130                 }
 131             }
 132             return nullptr;
 133         }
 134         const XMLCh* getProtocol() const {
 135             return m_protocol;
 136         }
 137         const NameID* getNameID() const {
 138             return m_session ? m_session->getNameID() : m_nameid;
 139         }
 140         const XMLCh* getClassRef() const {
 141             return m_class;
 142         }
 143         const XMLCh* getDeclRef() const {
 144             return m_decl;
 145         }
 146         const Session* getSession() const {
 147             return m_session;
 148         }
 149         vector<shibsp::Attribute*>& getResolvedAttributes() {
 150             return m_attributes;
 151         }
 152         vector<opensaml::Assertion*>& getResolvedAssertions() {
 153             return m_assertions;
 154         }
 155
 156     private:
 157         bool m_query;
 158         const Application& m_app;
 159         const Session* m_session;
 160         mutable MetadataProvider* m_metadata;
 161         mutable const EntityDescriptor* m_entity;
 162         const XMLCh* m_protocol;
 163         const NameID* m_nameid;
 164         const XMLCh* m_class;
 165         const XMLCh* m_decl;
 166         vector<shibsp::Attribute*> m_attributes;
 167         vector<opensaml::Assertion*> m_assertions;
 168     };
 169
 170     class SHIBSP_DLLLOCAL QueryResolver : public AttributeResolver
 171     {
 172     public:
 173         QueryResolver(const DOMElement* e);
 174         ~QueryResolver() {
 175             for_each(m_SAML1Designators.begin(), m_SAML1Designators.end(), xmltooling::cleanup<AttributeDesignator>());
 176             for_each(m_SAML2Designators.begin(), m_SAML2Designators.end(), xmltooling::cleanup<saml2::Attribute>());
 177         }
 178
 179         Lockable* lock() {return this;}
 180         void unlock() {}
 181
 182         ResolutionContext* createResolutionContext(
 183             const Application& application,
 184             const EntityDescriptor* issuer,
 185             const XMLCh* protocol,
 186             const NameID* nameid=nullptr,
 187             const XMLCh* authncontext_class=nullptr,
 188             const XMLCh* authncontext_decl=nullptr,
 189             const vector<const opensaml::Assertion*>* tokens=nullptr,
 190             const vector<shibsp::Attribute*>* attributes=nullptr
 191             ) const {
 192             return new QueryContext(application,issuer,protocol,nameid,authncontext_class,authncontext_decl,tokens);
 193         }
 194
 195         ResolutionContext* createResolutionContext(const Application& application, const Session& session) const {
 196             return new QueryContext(application,session);
 197         }
 198
 199         void resolveAttributes(ResolutionContext& ctx) const;
 200
 201         void getAttributeIds(vector<string>& attributes) const {
 202             // Nothing to do, only the extractor would actually generate them.
 203         }
 204
 205     private:
 206         void SAML1Query(QueryContext& ctx) const;
 207         void SAML2Query(QueryContext& ctx) const;
 208
 209         Category& m_log;
 210         string m_policyId;
 211         bool m_subjectMatch;
 212         vector<AttributeDesignator*> m_SAML1Designators;
 213         vector<saml2::Attribute*> m_SAML2Designators;
 214         vector<string> m_exceptionId;
 215     };
 216
 217     AttributeResolver* SHIBSP_DLLLOCAL QueryResolverFactory(const DOMElement* const & e)
 218     {
 219         return new QueryResolver(e);
 220     }
 221
 222     static const XMLCh exceptionId[] =  UNICODE_LITERAL_11(e,x,c,e,p,t,i,o,n,I,d);
 223     static const XMLCh policyId[] =     UNICODE_LITERAL_8(p,o,l,i,c,y,I,d);
 224     static const XMLCh subjectMatch[] = UNICODE_LITERAL_12(s,u,b,j,e,c,t,M,a,t,c,h);
 225 };
 226
 227 QueryResolver::QueryResolver(const DOMElement* e)
 228     : m_log(Category::getInstance(SHIBSP_LOGCAT".AttributeResolver.Query")),
 229         m_policyId(XMLHelper::getAttrString(e, nullptr, policyId)),
 230         m_subjectMatch(XMLHelper::getAttrBool(e, false, subjectMatch))
 231 {
 232 #ifdef _DEBUG
 233     xmltooling::NDC ndc("QueryResolver");
 234 #endif
 235
 236     DOMElement* child = XMLHelper::getFirstChildElement(e);
 237     while (child) {
 238         try {
 239             if (XMLHelper::isNodeNamed(child, samlconstants::SAML20_NS, saml2::Attribute::LOCAL_NAME)) {
 240                 auto_ptr<XMLObject> obj(saml2::AttributeBuilder::buildOneFromElement(child));
 241                 saml2::Attribute* down = dynamic_cast<saml2::Attribute*>(obj.get());
 242                 if (down) {
 243                     m_SAML2Designators.push_back(down);
 244                     obj.release();
 245                 }
 246             }
 247             else if (XMLHelper::isNodeNamed(child, samlconstants::SAML1_NS, AttributeDesignator::LOCAL_NAME)) {
 248                 auto_ptr<XMLObject> obj(AttributeDesignatorBuilder::buildOneFromElement(child));
 249                 AttributeDesignator* down = dynamic_cast<AttributeDesignator*>(obj.get());
 250                 if (down) {
 251                     m_SAML1Designators.push_back(down);
 252                     obj.release();
 253                 }
 254             }
 255         }
 256         catch (exception& ex) {
 257             m_log.error("exception loading attribute designator: %s", ex.what());
 258         }
 259         child = XMLHelper::getNextSiblingElement(child);
 260     }
 261
 262     string exid(XMLHelper::getAttrString(e, nullptr, exceptionId));
 263     if (!exid.empty())
 264         m_exceptionId.push_back(exid);
 265 }
 266
 267 void QueryResolver::SAML1Query(QueryContext& ctx) const
 268 {
 269 #ifdef _DEBUG
 270     xmltooling::NDC ndc("query");
 271 #endif
 272
 273     int version = XMLString::equals(ctx.getProtocol(), samlconstants::SAML11_PROTOCOL_ENUM) ? 1 : 0;
 274     const AttributeAuthorityDescriptor* AA =
 275         find_if(ctx.getEntityDescriptor()->getAttributeAuthorityDescriptors(), isValidForProtocol(ctx.getProtocol()));
 276     if (!AA) {
 277         m_log.warn("no SAML 1.%d AttributeAuthority role found in metadata", version);
 278         return;
 279     }
 280
 281     const Application& application = ctx.getApplication();
 282     const PropertySet* relyingParty = application.getRelyingParty(ctx.getEntityDescriptor());
 283
 284     // Locate policy key.
 285     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 286
 287     // Set up policy and SOAP client.
 288     auto_ptr<SecurityPolicy> policy(
 289         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, nullptr, policyId)
 290         );
 291     policy->getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 292     MetadataCredentialCriteria mcc(*AA);
 293     shibsp::SOAPClient soaper(*policy.get());
 294
 295     auto_ptr_XMLCh binding(samlconstants::SAML1_BINDING_SOAP);
 296     saml1p::Response* response=nullptr;
 297     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 298     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !response && ep!=endpoints.end(); ++ep) {
 299         if (!XMLString::equals((*ep)->getBinding(),binding.get()) || !(*ep)->getLocation())
 300             continue;
 301         auto_ptr_char loc((*ep)->getLocation());
 302         try {
 303             NameIdentifier* nameid = NameIdentifierBuilder::buildNameIdentifier();
 304             nameid->setName(ctx.getNameID()->getName());
 305             nameid->setFormat(ctx.getNameID()->getFormat());
 306             nameid->setNameQualifier(ctx.getNameID()->getNameQualifier());
 307             saml1::Subject* subject = saml1::SubjectBuilder::buildSubject();
 308             subject->setNameIdentifier(nameid);
 309             saml1p::AttributeQuery* query = saml1p::AttributeQueryBuilder::buildAttributeQuery();
 310             query->setSubject(subject);
 311             query->setResource(relyingParty->getXMLString("entityID").second);
 312             for (vector<AttributeDesignator*>::const_iterator ad = m_SAML1Designators.begin(); ad!=m_SAML1Designators.end(); ++ad)
 313                 query->getAttributeDesignators().push_back((*ad)->cloneAttributeDesignator());
 314             Request* request = RequestBuilder::buildRequest();
 315             request->setAttributeQuery(query);
 316             request->setMinorVersion(version);
 317
 318             SAML1SOAPClient client(soaper, false);
 319             client.sendSAML(request, application.getId(), mcc, loc.get());
 320             response = client.receiveSAML();
 321         }
 322         catch (exception& ex) {
 323             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 324             soaper.reset();
 325         }
 326     }
 327
 328     if (!response) {
 329         m_log.error("unable to obtain a SAML response from attribute authority");
 330         throw BindingException("Unable to obtain a SAML response from attribute authority.");
 331     }
 332     else if (!response->getStatus() || !response->getStatus()->getStatusCode() || response->getStatus()->getStatusCode()->getValue()==nullptr ||
 333             *(response->getStatus()->getStatusCode()->getValue()) != saml1p::StatusCode::SUCCESS) {
 334         delete response;
 335         m_log.error("attribute authority returned a SAML error");
 336         throw FatalProfileException("Attribute authority returned a SAML error.");
 337     }
 338
 339     const vector<saml1::Assertion*>& assertions = const_cast<const saml1p::Response*>(response)->getAssertions();
 340     if (assertions.empty()) {
 341         delete response;
 342         m_log.warn("response from attribute authority was empty");
 343         return;
 344     }
 345     else if (assertions.size()>1) {
 346         m_log.warn("simple resolver only supports one assertion in the query response");
 347     }
 348
 349     auto_ptr<saml1p::Response> wrapper(response);
 350     saml1::Assertion* newtoken = assertions.front();
 351
 352     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 353     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 354         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 355         throw SecurityPolicyException("Rejected unsigned assertion based on local policy.");
 356     }
 357
 358     try {
 359         // We're going to insist that the assertion issuer is the same as the peer.
 360         // Reset the policy's message bits and extract them from the assertion.
 361         policy->reset(true);
 362         policy->setMessageID(newtoken->getAssertionID());
 363         policy->setIssueInstant(newtoken->getIssueInstantEpoch());
 364         policy->setIssuer(newtoken->getIssuer());
 365         policy->evaluate(*newtoken);
 366
 367         // Now we can check the security status of the policy.
 368         if (!policy->isAuthenticated())
 369             throw SecurityPolicyException("Security of SAML 1.x query result not established.");
 370     }
 371     catch (exception& ex) {
 372         m_log.error("assertion failed policy validation: %s", ex.what());
 373         throw;
 374     }
 375
 376     newtoken->detach();
 377     wrapper.release();  // detach blows away the Response
 378     ctx.getResolvedAssertions().push_back(newtoken);
 379
 380     // Finally, extract and filter the result.
 381     try {
 382         AttributeExtractor* extractor = application.getAttributeExtractor();
 383         if (extractor) {
 384             Locker extlocker(extractor);
 385             const vector<saml1::AttributeStatement*>& statements = const_cast<const saml1::Assertion*>(newtoken)->getAttributeStatements();
 386             for (vector<saml1::AttributeStatement*>::const_iterator s = statements.begin(); s!=statements.end(); ++s) {
 387                 if (m_subjectMatch) {
 388                     // Check for subject match.
 389                     const NameIdentifier* respName = (*s)->getSubject() ? (*s)->getSubject()->getNameIdentifier() : nullptr;
 390                     if (!respName || !XMLString::equals(respName->getName(), ctx.getNameID()->getName()) ||
 391                         !XMLString::equals(respName->getFormat(), ctx.getNameID()->getFormat()) ||
 392                         !XMLString::equals(respName->getNameQualifier(), ctx.getNameID()->getNameQualifier())) {
 393                         if (respName)
 394                             m_log.warnStream() << "ignoring AttributeStatement without strongly matching NameIdentifier in Subject: " <<
 395                                 *respName << logging::eol;
 396                         else
 397                             m_log.warn("ignoring AttributeStatement without NameIdentifier in Subject");
 398                         continue;
 399                     }
 400                 }
 401                 extractor->extractAttributes(application, AA, *(*s), ctx.getResolvedAttributes());
 402             }
 403         }
 404
 405         AttributeFilter* filter = application.getAttributeFilter();
 406         if (filter) {
 407             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 408             Locker filtlocker(filter);
 409             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 410         }
 411     }
 412     catch (exception& ex) {
 413         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 414         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 415         ctx.getResolvedAttributes().clear();
 416         throw;
 417     }
 418 }
 419
 420 void QueryResolver::SAML2Query(QueryContext& ctx) const
 421 {
 422 #ifdef _DEBUG
 423     xmltooling::NDC ndc("query");
 424 #endif
 425
 426     const AttributeAuthorityDescriptor* AA =
 427         find_if(ctx.getEntityDescriptor()->getAttributeAuthorityDescriptors(), isValidForProtocol(samlconstants::SAML20P_NS));
 428     if (!AA) {
 429         m_log.warn("no SAML 2 AttributeAuthority role found in metadata");
 430         return;
 431     }
 432
 433     const Application& application = ctx.getApplication();
 434     const PropertySet* relyingParty = application.getRelyingParty(ctx.getEntityDescriptor());
 435     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 436     pair<bool,const char*> encryption = relyingParty->getString("encryption");
 437
 438     // Locate policy key.
 439     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 440
 441     // Set up policy and SOAP client.
 442     auto_ptr<SecurityPolicy> policy(
 443         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, nullptr, policyId)
 444         );
 445     policy->getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 446     MetadataCredentialCriteria mcc(*AA);
 447     shibsp::SOAPClient soaper(*policy.get());
 448
 449     auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
 450     saml2p::StatusResponseType* srt=nullptr;
 451     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 452     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !srt && ep!=endpoints.end(); ++ep) {
 453         if (!XMLString::equals((*ep)->getBinding(),binding.get())  || !(*ep)->getLocation())
 454             continue;
 455         auto_ptr_char loc((*ep)->getLocation());
 456         try {
 457             auto_ptr<saml2::Subject> subject(saml2::SubjectBuilder::buildSubject());
 458
 459             // Encrypt the NameID?
 460             if (encryption.first && (!strcmp(encryption.second, "true") || !strcmp(encryption.second, "back"))) {
 461                 auto_ptr<EncryptedID> encrypted(EncryptedIDBuilder::buildEncryptedID());
 462                 encrypted->encrypt(
 463                     *ctx.getNameID(),
 464                     *(application.getMetadataProvider()),
 465                     mcc,
 466                     false,
 467                     relyingParty->getXMLString("encryptionAlg").second
 468                     );
 469                 subject->setEncryptedID(encrypted.release());
 470             }
 471             else {
 472                 subject->setNameID(ctx.getNameID()->cloneNameID());
 473             }
 474
 475             saml2p::AttributeQuery* query = saml2p::AttributeQueryBuilder::buildAttributeQuery();
 476             query->setSubject(subject.release());
 477             Issuer* iss = IssuerBuilder::buildIssuer();
 478             iss->setName(relyingParty->getXMLString("entityID").second);
 479             query->setIssuer(iss);
 480             for (vector<saml2::Attribute*>::const_iterator ad = m_SAML2Designators.begin(); ad!=m_SAML2Designators.end(); ++ad)
 481                 query->getAttributes().push_back((*ad)->cloneAttribute());
 482
 483             SAML2SOAPClient client(soaper, false);
 484             client.sendSAML(query, application.getId(), mcc, loc.get());
 485             srt = client.receiveSAML();
 486         }
 487         catch (exception& ex) {
 488             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 489             soaper.reset();
 490         }
 491     }
 492
 493     if (!srt) {
 494         m_log.error("unable to obtain a SAML response from attribute authority");
 495         throw BindingException("Unable to obtain a SAML response from attribute authority.");
 496     }
 497
 498     auto_ptr<saml2p::StatusResponseType> wrapper(srt);
 499
 500     saml2p::Response* response = dynamic_cast<saml2p::Response*>(srt);
 501     if (!response) {
 502         m_log.error("message was not a samlp:Response");
 503         throw FatalProfileException("Attribute authority returned an unrecognized message.");
 504     }
 505     else if (!response->getStatus() || !response->getStatus()->getStatusCode() ||
 506             !XMLString::equals(response->getStatus()->getStatusCode()->getValue(), saml2p::StatusCode::SUCCESS)) {
 507         m_log.error("attribute authority returned a SAML error");
 508         throw FatalProfileException("Attribute authority returned a SAML error.");
 509     }
 510
 511     saml2::Assertion* newtoken = nullptr;
 512     const vector<saml2::Assertion*>& assertions = const_cast<const saml2p::Response*>(response)->getAssertions();
 513     if (assertions.empty()) {
 514         // Check for encryption.
 515         const vector<saml2::EncryptedAssertion*>& encassertions = const_cast<const saml2p::Response*>(response)->getEncryptedAssertions();
 516         if (encassertions.empty()) {
 517             m_log.warn("response from attribute authority was empty");
 518             return;
 519         }
 520         else if (encassertions.size() > 1) {
 521             m_log.warn("simple resolver only supports one assertion in the query response");
 522         }
 523
 524         CredentialResolver* cr=application.getCredentialResolver();
 525         if (!cr) {
 526             m_log.warn("found encrypted assertion, but no CredentialResolver was available");
 527             throw FatalProfileException("Assertion was encrypted, but no decryption credentials are available.");
 528         }
 529
 530         // Attempt to decrypt it.
 531         try {
 532             Locker credlocker(cr);
 533             auto_ptr<XMLObject> tokenwrapper(encassertions.front()->decrypt(*cr, relyingParty->getXMLString("entityID").second, &mcc));
 534             newtoken = dynamic_cast<saml2::Assertion*>(tokenwrapper.get());
 535             if (newtoken) {
 536                 tokenwrapper.release();
 537                 if (m_log.isDebugEnabled())
 538                     m_log.debugStream() << "decrypted Assertion: " << *newtoken << logging::eol;
 539                 // Free the Response now, so we know this is a stand-alone token later.
 540                 delete wrapper.release();
 541             }
 542         }
 543         catch (exception& ex) {
 544             m_log.error(ex.what());
 545             throw;
 546         }
 547     }
 548     else {
 549         if (assertions.size() > 1)
 550             m_log.warn("simple resolver only supports one assertion in the query response");
 551         newtoken = assertions.front();
 552     }
 553
 554     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 555         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 556         if (!wrapper.get())
 557             delete newtoken;
 558         throw SecurityPolicyException("Rejected unsigned assertion based on local policy.");
 559     }
 560
 561     try {
 562         // We're going to insist that the assertion issuer is the same as the peer.
 563         // Reset the policy's message bits and extract them from the assertion.
 564         policy->reset(true);
 565         policy->setMessageID(newtoken->getID());
 566         policy->setIssueInstant(newtoken->getIssueInstantEpoch());
 567         policy->setIssuer(newtoken->getIssuer());
 568         policy->evaluate(*newtoken);
 569
 570         // Now we can check the security status of the policy.
 571         if (!policy->isAuthenticated())
 572             throw SecurityPolicyException("Security of SAML 2.0 query result not established.");
 573
 574         if (m_subjectMatch) {
 575             // Check for subject match.
 576             bool ownedName = false;
 577             NameID* respName = newtoken->getSubject() ? newtoken->getSubject()->getNameID() : nullptr;
 578             if (!respName) {
 579                 // Check for encryption.
 580                 EncryptedID* encname = newtoken->getSubject() ? newtoken->getSubject()->getEncryptedID() : nullptr;
 581                 if (encname) {
 582                     CredentialResolver* cr=application.getCredentialResolver();
 583                     if (!cr)
 584                         m_log.warn("found EncryptedID, but no CredentialResolver was available");
 585                     else {
 586                         Locker credlocker(cr);
 587                         auto_ptr<XMLObject> decryptedID(encname->decrypt(*cr, relyingParty->getXMLString("entityID").second, &mcc));
 588                         respName = dynamic_cast<NameID*>(decryptedID.get());
 589                         if (respName) {
 590                             ownedName = true;
 591                             decryptedID.release();
 592                             if (m_log.isDebugEnabled())
 593                                 m_log.debugStream() << "decrypted NameID: " << *respName << logging::eol;
 594                         }
 595                     }
 596                 }
 597             }
 598
 599             auto_ptr<NameID> nameIDwrapper(ownedName ? respName : nullptr);
 600
 601             if (!respName || !XMLString::equals(respName->getName(), ctx.getNameID()->getName()) ||
 602                 !XMLString::equals(respName->getFormat(), ctx.getNameID()->getFormat()) ||
 603                 !XMLString::equals(respName->getNameQualifier(), ctx.getNameID()->getNameQualifier()) ||
 604                 !XMLString::equals(respName->getSPNameQualifier(), ctx.getNameID()->getSPNameQualifier())) {
 605                 if (respName)
 606                     m_log.warnStream() << "ignoring Assertion without strongly matching NameID in Subject: " <<
 607                         *respName << logging::eol;
 608                 else
 609                     m_log.warn("ignoring Assertion without NameID in Subject");
 610                 if (!wrapper.get())
 611                     delete newtoken;
 612                 return;
 613             }
 614         }
 615     }
 616     catch (exception& ex) {
 617         m_log.error("assertion failed policy validation: %s", ex.what());
 618         if (!wrapper.get())
 619             delete newtoken;
 620         throw;
 621     }
 622
 623     if (wrapper.get()) {
 624         newtoken->detach();
 625         wrapper.release();  // detach blows away the Response
 626     }
 627     ctx.getResolvedAssertions().push_back(newtoken);
 628
 629     // Finally, extract and filter the result.
 630     try {
 631         AttributeExtractor* extractor = application.getAttributeExtractor();
 632         if (extractor) {
 633             Locker extlocker(extractor);
 634             extractor->extractAttributes(application, AA, *newtoken, ctx.getResolvedAttributes());
 635         }
 636
 637         AttributeFilter* filter = application.getAttributeFilter();
 638         if (filter) {
 639             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 640             Locker filtlocker(filter);
 641             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 642         }
 643     }
 644     catch (exception& ex) {
 645         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 646         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 647         ctx.getResolvedAttributes().clear();
 648         throw;
 649     }
 650 }
 651
 652 void QueryResolver::resolveAttributes(ResolutionContext& ctx) const
 653 {
 654 #ifdef _DEBUG
 655     xmltooling::NDC ndc("resolveAttributes");
 656 #endif
 657
 658     QueryContext& qctx = dynamic_cast<QueryContext&>(ctx);
 659     if (!qctx.doQuery()) {
 660         m_log.debug("found AttributeStatement in input to new session, skipping query");
 661         return;
 662     }
 663
 664     try {
 665         if (qctx.getNameID() && qctx.getEntityDescriptor()) {
 666             if (XMLString::equals(qctx.getProtocol(), samlconstants::SAML20P_NS)) {
 667                 m_log.debug("attempting SAML 2.0 attribute query");
 668                 SAML2Query(qctx);
 669             }
 670             else if (XMLString::equals(qctx.getProtocol(), samlconstants::SAML11_PROTOCOL_ENUM) ||
 671                     XMLString::equals(qctx.getProtocol(), samlconstants::SAML10_PROTOCOL_ENUM)) {
 672                 m_log.debug("attempting SAML 1.x attribute query");
 673                 SAML1Query(qctx);
 674             }
 675             else {
 676                 m_log.info("SSO protocol does not allow for attribute query");
 677             }
 678         }
 679         else {
 680             m_log.warn("can't attempt attribute query, either no NameID or no metadata to use");
 681         }
 682     }
 683     catch (exception& ex) {
 684         // Already logged.
 685         if (!m_exceptionId.empty()) {
 686             SimpleAttribute* attr = new SimpleAttribute(m_exceptionId);
 687             attr->getValues().push_back(XMLToolingConfig::getConfig().getURLEncoder()->encode(ex.what()));
 688             qctx.getResolvedAttributes().push_back(attr);
 689         }
 690     }
 691 }