shibsp/attribute/resolver/impl/SimpleAggregationAttributeResolver.cpp

   1 /*
   2  *  Copyright 2009 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  * SimpleAggregationAttributeResolver.cpp
  19  *
  20  * AttributeResolver based on SAML queries to third-party AA sources.
  21  */
  22
  23 #include "internal.h"
  24 #include "Application.h"
  25 #include "ServiceProvider.h"
  26 #include "SessionCache.h"
  27 #include "attribute/NameIDAttribute.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 "util/SPConstants.h"
  36
  37 #include <saml/exceptions.h>
  38 #include <saml/SAMLConfig.h>
  39 #include <saml/binding/SecurityPolicy.h>
  40 #include <saml/saml2/binding/SAML2SOAPClient.h>
  41 #include <saml/saml2/core/Protocols.h>
  42 #include <saml/saml2/metadata/MetadataProvider.h>
  43 #include <xmltooling/util/NDC.h>
  44 #include <xmltooling/util/XMLHelper.h>
  45 #include <xercesc/util/XMLUniDefs.hpp>
  46
  47 using namespace shibsp;
  48 using namespace opensaml::saml2;
  49 using namespace opensaml::saml2p;
  50 using namespace opensaml::saml2md;
  51 using namespace opensaml;
  52 using namespace xmltooling;
  53 using namespace std;
  54
  55 namespace shibsp {
  56
  57     class SHIBSP_DLLLOCAL SimpleAggregationContext : public ResolutionContext
  58     {
  59     public:
  60         SimpleAggregationContext(const Application& application, const Session& session)
  61             : m_app(application),
  62               m_session(&session),
  63               m_nameid(NULL),
  64               m_class(XMLString::transcode(session.getAuthnContextClassRef())),
  65               m_decl(XMLString::transcode(session.getAuthnContextDeclRef())),
  66               m_inputTokens(NULL),
  67               m_inputAttributes(NULL) {
  68         }
  69
  70         SimpleAggregationContext(
  71             const Application& application,
  72             const NameID* nameid=NULL,
  73             const XMLCh* authncontext_class=NULL,
  74             const XMLCh* authncontext_decl=NULL,
  75             const vector<const opensaml::Assertion*>* tokens=NULL,
  76             const vector<shibsp::Attribute*>* attributes=NULL
  77             ) : m_app(application),
  78                 m_session(NULL),
  79                 m_nameid(nameid),
  80                 m_class(const_cast<XMLCh*>(authncontext_class)),
  81                 m_decl(const_cast<XMLCh*>(authncontext_decl)),
  82                 m_inputTokens(tokens),
  83                 m_inputAttributes(attributes) {
  84         }
  85
  86         ~SimpleAggregationContext() {
  87             for_each(m_attributes.begin(), m_attributes.end(), xmltooling::cleanup<shibsp::Attribute>());
  88             for_each(m_assertions.begin(), m_assertions.end(), xmltooling::cleanup<opensaml::Assertion>());
  89             if (m_session) {
  90                 XMLString::release(&m_class);
  91                 XMLString::release(&m_decl);
  92             }
  93         }
  94
  95         const Application& getApplication() const {
  96             return m_app;
  97         }
  98         const NameID* getNameID() const {
  99             return m_session ? m_session->getNameID() : m_nameid;
 100         }
 101         const XMLCh* getClassRef() const {
 102             return m_class;
 103         }
 104         const XMLCh* getDeclRef() const {
 105             return m_decl;
 106         }
 107         const Session* getSession() const {
 108             return m_session;
 109         }
 110         const vector<shibsp::Attribute*>* getInputAttributes() const {
 111             return m_inputAttributes;
 112         }
 113         const vector<const opensaml::Assertion*>* getInputTokens() const {
 114             return m_inputTokens;
 115         }
 116         vector<shibsp::Attribute*>& getResolvedAttributes() {
 117             return m_attributes;
 118         }
 119         vector<opensaml::Assertion*>& getResolvedAssertions() {
 120             return m_assertions;
 121         }
 122
 123     private:
 124         const Application& m_app;
 125         const Session* m_session;
 126         const NameID* m_nameid;
 127         XMLCh* m_class;
 128         XMLCh* m_decl;
 129         const vector<const opensaml::Assertion*>* m_inputTokens;
 130         const vector<shibsp::Attribute*>* m_inputAttributes;
 131         vector<shibsp::Attribute*> m_attributes;
 132         vector<opensaml::Assertion*> m_assertions;
 133     };
 134
 135     class SHIBSP_DLLLOCAL SimpleAggregationResolver : public AttributeResolver
 136     {
 137     public:
 138         SimpleAggregationResolver(const DOMElement* e);
 139         ~SimpleAggregationResolver() {
 140             delete m_trust;
 141             delete m_metadata;
 142             for_each(m_designators.begin(), m_designators.end(), xmltooling::cleanup<saml2::Attribute>());
 143         }
 144
 145         Lockable* lock() {return this;}
 146         void unlock() {}
 147
 148         ResolutionContext* createResolutionContext(
 149             const Application& application,
 150             const EntityDescriptor* issuer,
 151             const XMLCh* protocol,
 152             const NameID* nameid=NULL,
 153             const XMLCh* authncontext_class=NULL,
 154             const XMLCh* authncontext_decl=NULL,
 155             const vector<const opensaml::Assertion*>* tokens=NULL,
 156             const vector<shibsp::Attribute*>* attributes=NULL
 157             ) const {
 158             return new SimpleAggregationContext(application,nameid,authncontext_class,authncontext_decl,tokens,attributes);
 159         }
 160
 161         ResolutionContext* createResolutionContext(const Application& application, const Session& session) const {
 162             return new SimpleAggregationContext(application,session);
 163         }
 164
 165         void resolveAttributes(ResolutionContext& ctx) const;
 166
 167         void getAttributeIds(vector<string>& attributes) const {
 168             // Nothing to do, only the extractor would actually generate them.
 169         }
 170
 171     private:
 172         bool doQuery(SimpleAggregationContext& ctx, const char* entityID, const NameID* name) const;
 173
 174         Category& m_log;
 175         string m_policyId;
 176         vector<string> m_attributeIds;
 177         xstring m_format;
 178         MetadataProvider* m_metadata;
 179         TrustEngine* m_trust;
 180         vector<saml2::Attribute*> m_designators;
 181         vector< pair<string,bool> > m_sources;
 182     };
 183
 184     AttributeResolver* SHIBSP_DLLLOCAL SimpleAggregationResolverFactory(const DOMElement* const & e)
 185     {
 186         return new SimpleAggregationResolver(e);
 187     }
 188
 189     static const XMLCh attributeId[] =          UNICODE_LITERAL_11(a,t,t,r,i,b,u,t,e,I,d);
 190     static const XMLCh Entity[] =               UNICODE_LITERAL_6(E,n,t,i,t,y);
 191     static const XMLCh EntityReference[] =      UNICODE_LITERAL_15(E,n,t,i,t,y,R,e,f,e,r,e,n,c,e);
 192     static const XMLCh format[] =               UNICODE_LITERAL_6(f,o,r,m,a,t);
 193     static const XMLCh _MetadataProvider[] =    UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
 194     static const XMLCh policyId[] =             UNICODE_LITERAL_8(p,o,l,i,c,y,I,d);
 195     static const XMLCh _TrustEngine[] =         UNICODE_LITERAL_11(T,r,u,s,t,E,n,g,i,n,e);
 196     static const XMLCh _type[] =                UNICODE_LITERAL_4(t,y,p,e);
 197 };
 198
 199 SimpleAggregationResolver::SimpleAggregationResolver(const DOMElement* e)
 200     : m_log(Category::getInstance(SHIBSP_LOGCAT".AttributeResolver.SimpleAggregation")), m_metadata(NULL), m_trust(NULL)
 201 {
 202 #ifdef _DEBUG
 203     xmltooling::NDC ndc("SimpleAggregationResolver");
 204 #endif
 205
 206     const XMLCh* pid = e ? e->getAttributeNS(NULL, policyId) : NULL;
 207     if (pid && *pid) {
 208         auto_ptr_char temp(pid);
 209         m_policyId = temp.get();
 210     }
 211
 212     pid = e ? e->getAttributeNS(NULL, attributeId) : NULL;
 213     if (pid && *pid) {
 214         char* dup = XMLString::transcode(pid);
 215         char* pos;
 216         char* start = dup;
 217         while (start && *start) {
 218             while (*start && isspace(*start))
 219                 start++;
 220             if (!*start)
 221                 break;
 222             pos = strchr(start,' ');
 223             if (pos)
 224                 *pos=0;
 225             m_attributeIds.push_back(start);
 226             start = pos ? pos+1 : NULL;
 227         }
 228         XMLString::release(&dup);
 229
 230         pid = e->getAttributeNS(NULL, format);
 231         if (pid && *pid)
 232             m_format = pid;
 233
 234     }
 235
 236     DOMElement* child = XMLHelper::getFirstChildElement(e, _MetadataProvider);
 237     if (child) {
 238         auto_ptr_char type(child->getAttributeNS(NULL, _type));
 239         if (!type.get() || !*type.get())
 240             throw ConfigurationException("MetadataProvider element missing type attribute.");
 241         m_log.info("building MetadataProvider of type %s...", type.get());
 242         auto_ptr<MetadataProvider> mp(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(type.get(), child));
 243         mp->init();
 244         m_metadata = mp.release();
 245     }
 246
 247     child = XMLHelper::getFirstChildElement(e,  _TrustEngine);
 248     if (child) {
 249         try {
 250             auto_ptr_char type(child->getAttributeNS(NULL, _type));
 251             if (!type.get() || !*type.get())
 252                 throw ConfigurationException("TrustEngine element missing type attribute.");
 253             m_log.info("building TrustEngine of type %s...", type.get());
 254             m_trust = XMLToolingConfig::getConfig().TrustEngineManager.newPlugin(type.get(), child);
 255         }
 256         catch (exception&) {
 257             delete m_metadata;
 258             throw;
 259         }
 260     }
 261
 262     child = XMLHelper::getFirstChildElement(e);
 263     while (child) {
 264         if (child->hasChildNodes() && XMLString::equals(child->getLocalName(), Entity)) {
 265             pid = child->getFirstChild()->getNodeValue();
 266             if (pid && *pid) {
 267                 auto_ptr_char tpid(pid);
 268                 m_sources.push_back(pair<string,bool>(tpid.get(),true));
 269             }
 270         }
 271         else if (child->hasChildNodes() && XMLString::equals(child->getLocalName(), EntityReference)) {
 272             pid = child->getFirstChild()->getNodeValue();
 273             if (pid && *pid) {
 274                 auto_ptr_char tpid(pid);
 275                 m_sources.push_back(pair<string,bool>(tpid.get(),false));
 276             }
 277         }
 278         else if (XMLHelper::isNodeNamed(child, samlconstants::SAML20_NS, saml2::Attribute::LOCAL_NAME)) {
 279             try {
 280                 auto_ptr<XMLObject> obj(saml2::AttributeBuilder::buildOneFromElement(child));
 281                 saml2::Attribute* down = dynamic_cast<saml2::Attribute*>(obj.get());
 282                 if (down) {
 283                     m_designators.push_back(down);
 284                     obj.release();
 285                 }
 286             }
 287             catch (exception& ex) {
 288                 m_log.error("exception loading attribute designator: %s", ex.what());
 289             }
 290         }
 291         child = XMLHelper::getNextSiblingElement(child);
 292     }
 293
 294 }
 295
 296 bool SimpleAggregationResolver::doQuery(SimpleAggregationContext& ctx, const char* entityID, const NameID* name) const
 297 {
 298 #ifdef _DEBUG
 299     xmltooling::NDC ndc("doQuery");
 300 #endif
 301     const Application& application = ctx.getApplication();
 302     MetadataProviderCriteria mc(application, entityID, &AttributeAuthorityDescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS);
 303     Locker mlocker(m_metadata);
 304     const AttributeAuthorityDescriptor* AA=NULL;
 305     pair<const EntityDescriptor*,const RoleDescriptor*> mdresult =
 306         (m_metadata ? m_metadata : application.getMetadataProvider())->getEntityDescriptor(mc);
 307     if (!mdresult.first) {
 308         m_log.warn("unable to locate metadata for provider (%s)", entityID);
 309         return false;
 310     }
 311     else if (!(AA=dynamic_cast<const AttributeAuthorityDescriptor*>(mdresult.second))) {
 312         m_log.warn("no SAML 2 AttributeAuthority role found in metadata for (%s)", entityID);
 313         return false;
 314     }
 315
 316     const PropertySet* relyingParty = application.getRelyingParty(mdresult.first);
 317
 318     // Locate policy key.
 319     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 320
 321     // Access policy properties.
 322     const PropertySet* settings = application.getServiceProvider().getPolicySettings(policyId);
 323     pair<bool,bool> validate = settings->getBool("validate");
 324
 325     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 326     pair<bool,const char*> encryption = relyingParty->getString("encryption");
 327
 328     shibsp::SecurityPolicy policy(application, NULL, validate.first && validate.second, policyId);
 329     if (m_metadata)
 330         policy.setMetadataProvider(m_metadata);
 331     if (m_trust)
 332         policy.setTrustEngine(m_trust);
 333     policy.getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 334
 335     MetadataCredentialCriteria mcc(*AA);
 336     shibsp::SOAPClient soaper(policy);
 337
 338     auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
 339     saml2p::StatusResponseType* srt=NULL;
 340     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 341     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !srt && ep!=endpoints.end(); ++ep) {
 342         if (!XMLString::equals((*ep)->getBinding(),binding.get())  || !(*ep)->getLocation())
 343             continue;
 344         auto_ptr_char loc((*ep)->getLocation());
 345         try {
 346             auto_ptr<saml2::Subject> subject(saml2::SubjectBuilder::buildSubject());
 347
 348             // Encrypt the NameID?
 349             if (encryption.first && (!strcmp(encryption.second, "true") || !strcmp(encryption.second, "back"))) {
 350                 auto_ptr<EncryptedID> encrypted(EncryptedIDBuilder::buildEncryptedID());
 351                 MetadataCredentialCriteria mcc(*AA);
 352                 encrypted->encrypt(
 353                     *name,
 354                     *(policy.getMetadataProvider()),
 355                     mcc,
 356                     false,
 357                     relyingParty->getXMLString("encryptionAlg").second
 358                     );
 359                 subject->setEncryptedID(encrypted.release());
 360             }
 361             else {
 362                 subject->setNameID(name->cloneNameID());
 363             }
 364
 365             saml2p::AttributeQuery* query = saml2p::AttributeQueryBuilder::buildAttributeQuery();
 366             query->setSubject(subject.release());
 367             Issuer* iss = IssuerBuilder::buildIssuer();
 368             iss->setName(relyingParty->getXMLString("entityID").second);
 369             query->setIssuer(iss);
 370             for (vector<saml2::Attribute*>::const_iterator ad = m_designators.begin(); ad!=m_designators.end(); ++ad)
 371                 query->getAttributes().push_back((*ad)->cloneAttribute());
 372
 373             SAML2SOAPClient client(soaper, false);
 374             client.sendSAML(query, application.getId(), mcc, loc.get());
 375             srt = client.receiveSAML();
 376         }
 377         catch (exception& ex) {
 378             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 379             soaper.reset();
 380         }
 381     }
 382
 383     if (!srt) {
 384         m_log.error("unable to obtain a SAML response from attribute authority (%s)", entityID);
 385         return false;
 386     }
 387     saml2p::Response* response = dynamic_cast<saml2p::Response*>(srt);
 388     if (!response) {
 389         delete srt;
 390         m_log.error("message was not a samlp:Response");
 391         return true;
 392     }
 393     else if (!response->getStatus() || !response->getStatus()->getStatusCode() ||
 394             !XMLString::equals(response->getStatus()->getStatusCode()->getValue(), saml2p::StatusCode::SUCCESS)) {
 395         delete srt;
 396         m_log.error("attribute authority (%s) returned a SAML error", entityID);
 397         return true;
 398     }
 399
 400     const vector<saml2::Assertion*>& assertions = const_cast<const saml2p::Response*>(response)->getAssertions();
 401     if (assertions.empty()) {
 402         delete srt;
 403         m_log.warn("response from attribute authority (%s) was empty", entityID);
 404         return true;
 405     }
 406     else if (assertions.size()>1)
 407         m_log.warn("resolver only supports one assertion in the query response");
 408
 409     auto_ptr<saml2p::StatusResponseType> wrapper(srt);
 410     saml2::Assertion* newtoken = assertions.front();
 411
 412     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 413         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 414         return true;
 415     }
 416
 417     try {
 418         // We're going to insist that the assertion issuer is the same as the peer.
 419         // Reset the policy's message bits and extract them from the assertion.
 420         policy.reset(true);
 421         policy.setMessageID(newtoken->getID());
 422         policy.setIssueInstant(newtoken->getIssueInstantEpoch());
 423         policy.setIssuer(newtoken->getIssuer());
 424         policy.evaluate(*newtoken);
 425
 426         // Now we can check the security status of the policy.
 427         if (!policy.isAuthenticated())
 428             throw SecurityPolicyException("Security of SAML 2.0 query result not established.");
 429     }
 430     catch (exception& ex) {
 431         m_log.error("assertion failed policy validation: %s", ex.what());
 432         return true;
 433     }
 434
 435     newtoken->detach();
 436     wrapper.release();
 437     ctx.getResolvedAssertions().push_back(newtoken);
 438
 439     // Finally, extract and filter the result.
 440     try {
 441         AttributeExtractor* extractor = application.getAttributeExtractor();
 442         if (extractor) {
 443             Locker extlocker(extractor);
 444             extractor->extractAttributes(application, AA, *newtoken, ctx.getResolvedAttributes());
 445         }
 446
 447         AttributeFilter* filter = application.getAttributeFilter();
 448         if (filter) {
 449             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 450             Locker filtlocker(filter);
 451             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 452         }
 453     }
 454     catch (exception& ex) {
 455         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 456         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 457         ctx.getResolvedAttributes().clear();
 458     }
 459
 460     return true;
 461 }
 462
 463 void SimpleAggregationResolver::resolveAttributes(ResolutionContext& ctx) const
 464 {
 465 #ifdef _DEBUG
 466     xmltooling::NDC ndc("resolveAttributes");
 467 #endif
 468
 469     SimpleAggregationContext& qctx = dynamic_cast<SimpleAggregationContext&>(ctx);
 470
 471     // First we manufacture the appropriate NameID to use.
 472     NameID* n=NULL;
 473     for (vector<string>::const_iterator a = m_attributeIds.begin(); !n && a != m_attributeIds.end(); ++a) {
 474         const Attribute* attr=NULL;
 475         if (qctx.getSession()) {
 476             // Input attributes should be available via multimap.
 477             pair<multimap<string,const Attribute*>::const_iterator, multimap<string,const Attribute*>::const_iterator> range =
 478                 qctx.getSession()->getIndexedAttributes().equal_range(*a);
 479             for (; !attr && range.first != range.second; ++range.first) {
 480                 if (range.first->second->valueCount() > 0)
 481                     attr = range.first->second;
 482             }
 483         }
 484         else if (qctx.getInputAttributes()) {
 485             // Have to loop over unindexed set.
 486             const vector<Attribute*>* matches = qctx.getInputAttributes();
 487             for (vector<Attribute*>::const_iterator match = matches->begin(); !attr && match != matches->end(); ++match) {
 488                 if (*a == (*match)->getId() && (*match)->valueCount() > 0)
 489                     attr = *match;
 490             }
 491         }
 492
 493         if (attr) {
 494             m_log.debug("using input attribute (%s) as identifier for queries", attr->getId());
 495             n = NameIDBuilder::buildNameID();
 496             const NameIDAttribute* down = dynamic_cast<const NameIDAttribute*>(attr);
 497             if (down) {
 498                 // We can create a NameID directly from the source material.
 499                 const NameIDAttribute::Value& v = down->getValues().front();
 500                 XMLCh* val = fromUTF8(v.m_Name.c_str());
 501                 n->setName(val);
 502                 delete[] val;
 503                 if (!v.m_Format.empty()) {
 504                     val = fromUTF8(v.m_Format.c_str());
 505                     n->setFormat(val);
 506                     delete[] val;
 507                 }
 508                 if (!v.m_NameQualifier.empty()) {
 509                     val = fromUTF8(v.m_NameQualifier.c_str());
 510                     n->setNameQualifier(val);
 511                     delete[] val;
 512                 }
 513                 if (!v.m_SPNameQualifier.empty()) {
 514                     val = fromUTF8(v.m_SPNameQualifier.c_str());
 515                     n->setSPNameQualifier(val);
 516                     delete[] val;
 517                 }
 518                 if (!v.m_SPProvidedID.empty()) {
 519                     val = fromUTF8(v.m_SPProvidedID.c_str());
 520                     n->setSPProvidedID(val);
 521                     delete[] val;
 522                 }
 523             }
 524             else {
 525                 // We have to mock up the NameID.
 526                 XMLCh* val = fromUTF8(attr->getSerializedValues().front().c_str());
 527                 n->setName(val);
 528                 delete[] val;
 529                 if (!m_format.empty())
 530                     n->setFormat(m_format.c_str());
 531             }
 532         }
 533     }
 534
 535     if (!n) {
 536         if (qctx.getNameID() && m_attributeIds.empty()) {
 537             m_log.debug("using authenticated NameID as identifier for queries");
 538         }
 539         else {
 540             m_log.warn("unable to resolve attributes, no suitable query identifier found");
 541             return;
 542         }
 543     }
 544
 545     auto_ptr<NameID> wrapper(n);
 546
 547     set<string> history;
 548
 549     // We have a master loop over all the possible sources of material.
 550     for (vector< pair<string,bool> >::const_iterator source = m_sources.begin(); source != m_sources.end(); ++source) {
 551         if (source->second) {
 552             // A literal entityID to query.
 553             if (history.count(source->first) == 0) {
 554                 m_log.debug("issuing SAML query to (%s)", source->first.c_str());
 555                 doQuery(qctx, source->first.c_str(), n ? n : qctx.getNameID());
 556                 history.insert(source->first);
 557             }
 558             else {
 559                 m_log.debug("skipping previously queried attribute source (%s)", source->first.c_str());
 560             }
 561         }
 562         else {
 563             m_log.debug("using attribute sources referenced in attribute (%s)", source->first.c_str());
 564             if (qctx.getSession()) {
 565                 // Input attributes should be available via multimap.
 566                 pair<multimap<string,const Attribute*>::const_iterator, multimap<string,const Attribute*>::const_iterator> range =
 567                     qctx.getSession()->getIndexedAttributes().equal_range(source->first);
 568                 for (; range.first != range.second; ++range.first) {
 569                     const vector<string>& links = range.first->second->getSerializedValues();
 570                     for (vector<string>::const_iterator link = links.begin(); link != links.end(); ++link) {
 571                         if (history.count(*link) == 0) {
 572                             m_log.debug("issuing SAML query to (%s)", link->c_str());
 573                             doQuery(qctx, link->c_str(), n ? n : qctx.getNameID());
 574                             history.insert(*link);
 575                         }
 576                         else {
 577                             m_log.debug("skipping previously queried attribute source (%s)", link->c_str());
 578                         }
 579                     }
 580                 }
 581             }
 582             else if (qctx.getInputAttributes()) {
 583                 // Have to loop over unindexed set.
 584                 const vector<Attribute*>* matches = qctx.getInputAttributes();
 585                 for (vector<Attribute*>::const_iterator match = matches->begin(); match != matches->end(); ++match) {
 586                     if (source->first == (*match)->getId()) {
 587                         const vector<string>& links = (*match)->getSerializedValues();
 588                         for (vector<string>::const_iterator link = links.begin(); link != links.end(); ++link) {
 589                             if (history.count(*link) == 0) {
 590                                 m_log.debug("issuing SAML query to (%s)", link->c_str());
 591                                 doQuery(qctx, link->c_str(), n ? n : qctx.getNameID());
 592                                 history.insert(*link);
 593                             }
 594                             else {
 595                                 m_log.debug("skipping previously queried attribute source (%s)", link->c_str());
 596                             }
 597                         }
 598                     }
 599                 }
 600             }
 601         }
 602     }
 603 }