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 "exceptions.h"
  25 #include "Application.h"
  26 #include "ServiceProvider.h"
  27 #include "SessionCache.h"
  28 #include "attribute/NameIDAttribute.h"
  29 #include "attribute/filtering/AttributeFilter.h"
  30 #include "attribute/filtering/BasicFilteringContext.h"
  31 #include "attribute/resolver/AttributeExtractor.h"
  32 #include "attribute/resolver/AttributeResolver.h"
  33 #include "attribute/resolver/ResolutionContext.h"
  34 #include "binding/SOAPClient.h"
  35 #include "metadata/MetadataProviderCriteria.h"
  36 #include "security/SecurityPolicy.h"
  37 #include "util/SPConstants.h"
  38
  39 #include <saml/exceptions.h>
  40 #include <saml/SAMLConfig.h>
  41 #include <saml/saml2/binding/SAML2SOAPClient.h>
  42 #include <saml/saml2/core/Protocols.h>
  43 #include <saml/saml2/metadata/Metadata.h>
  44 #include <saml/saml2/metadata/MetadataProvider.h>
  45 #include <xmltooling/XMLToolingConfig.h>
  46 #include <xmltooling/security/TrustEngine.h>
  47 #include <xmltooling/util/NDC.h>
  48 #include <xmltooling/util/XMLHelper.h>
  49 #include <xercesc/util/XMLUniDefs.hpp>
  50
  51 using namespace shibsp;
  52 using namespace opensaml::saml2;
  53 using namespace opensaml::saml2p;
  54 using namespace opensaml::saml2md;
  55 using namespace opensaml;
  56 using namespace xmltooling;
  57 using namespace std;
  58
  59 namespace shibsp {
  60
  61     class SHIBSP_DLLLOCAL SimpleAggregationContext : public ResolutionContext
  62     {
  63     public:
  64         SimpleAggregationContext(const Application& application, const Session& session)
  65             : m_app(application),
  66               m_session(&session),
  67               m_nameid(NULL),
  68               m_class(XMLString::transcode(session.getAuthnContextClassRef())),
  69               m_decl(XMLString::transcode(session.getAuthnContextDeclRef())),
  70               m_inputTokens(NULL),
  71               m_inputAttributes(NULL) {
  72         }
  73
  74         SimpleAggregationContext(
  75             const Application& application,
  76             const NameID* nameid=NULL,
  77             const XMLCh* authncontext_class=NULL,
  78             const XMLCh* authncontext_decl=NULL,
  79             const vector<const opensaml::Assertion*>* tokens=NULL,
  80             const vector<shibsp::Attribute*>* attributes=NULL
  81             ) : m_app(application),
  82                 m_session(NULL),
  83                 m_nameid(nameid),
  84                 m_class(const_cast<XMLCh*>(authncontext_class)),
  85                 m_decl(const_cast<XMLCh*>(authncontext_decl)),
  86                 m_inputTokens(tokens),
  87                 m_inputAttributes(attributes) {
  88         }
  89
  90         ~SimpleAggregationContext() {
  91             for_each(m_attributes.begin(), m_attributes.end(), xmltooling::cleanup<shibsp::Attribute>());
  92             for_each(m_assertions.begin(), m_assertions.end(), xmltooling::cleanup<opensaml::Assertion>());
  93             if (m_session) {
  94                 XMLString::release(&m_class);
  95                 XMLString::release(&m_decl);
  96             }
  97         }
  98
  99         const Application& getApplication() const {
 100             return m_app;
 101         }
 102         const NameID* getNameID() const {
 103             return m_session ? m_session->getNameID() : m_nameid;
 104         }
 105         const XMLCh* getClassRef() const {
 106             return m_class;
 107         }
 108         const XMLCh* getDeclRef() const {
 109             return m_decl;
 110         }
 111         const Session* getSession() const {
 112             return m_session;
 113         }
 114         const vector<shibsp::Attribute*>* getInputAttributes() const {
 115             return m_inputAttributes;
 116         }
 117         const vector<const opensaml::Assertion*>* getInputTokens() const {
 118             return m_inputTokens;
 119         }
 120         vector<shibsp::Attribute*>& getResolvedAttributes() {
 121             return m_attributes;
 122         }
 123         vector<opensaml::Assertion*>& getResolvedAssertions() {
 124             return m_assertions;
 125         }
 126
 127     private:
 128         const Application& m_app;
 129         const Session* m_session;
 130         const NameID* m_nameid;
 131         XMLCh* m_class;
 132         XMLCh* m_decl;
 133         const vector<const opensaml::Assertion*>* m_inputTokens;
 134         const vector<shibsp::Attribute*>* m_inputAttributes;
 135         vector<shibsp::Attribute*> m_attributes;
 136         vector<opensaml::Assertion*> m_assertions;
 137     };
 138
 139     class SHIBSP_DLLLOCAL SimpleAggregationResolver : public AttributeResolver
 140     {
 141     public:
 142         SimpleAggregationResolver(const DOMElement* e);
 143         ~SimpleAggregationResolver() {
 144             delete m_trust;
 145             delete m_metadata;
 146             for_each(m_designators.begin(), m_designators.end(), xmltooling::cleanup<saml2::Attribute>());
 147         }
 148
 149         Lockable* lock() {return this;}
 150         void unlock() {}
 151
 152         ResolutionContext* createResolutionContext(
 153             const Application& application,
 154             const EntityDescriptor* issuer,
 155             const XMLCh* protocol,
 156             const NameID* nameid=NULL,
 157             const XMLCh* authncontext_class=NULL,
 158             const XMLCh* authncontext_decl=NULL,
 159             const vector<const opensaml::Assertion*>* tokens=NULL,
 160             const vector<shibsp::Attribute*>* attributes=NULL
 161             ) const {
 162             return new SimpleAggregationContext(application,nameid,authncontext_class,authncontext_decl,tokens,attributes);
 163         }
 164
 165         ResolutionContext* createResolutionContext(const Application& application, const Session& session) const {
 166             return new SimpleAggregationContext(application,session);
 167         }
 168
 169         void resolveAttributes(ResolutionContext& ctx) const;
 170
 171         void getAttributeIds(vector<string>& attributes) const {
 172             // Nothing to do, only the extractor would actually generate them.
 173         }
 174
 175     private:
 176         bool doQuery(SimpleAggregationContext& ctx, const char* entityID, const NameID* name) const;
 177
 178         Category& m_log;
 179         string m_policyId;
 180         vector<string> m_attributeIds;
 181         xstring m_format;
 182         MetadataProvider* m_metadata;
 183         TrustEngine* m_trust;
 184         vector<saml2::Attribute*> m_designators;
 185         vector< pair<string,bool> > m_sources;
 186     };
 187
 188     AttributeResolver* SHIBSP_DLLLOCAL SimpleAggregationResolverFactory(const DOMElement* const & e)
 189     {
 190         return new SimpleAggregationResolver(e);
 191     }
 192
 193     static const XMLCh attributeId[] =          UNICODE_LITERAL_11(a,t,t,r,i,b,u,t,e,I,d);
 194     static const XMLCh Entity[] =               UNICODE_LITERAL_6(E,n,t,i,t,y);
 195     static const XMLCh EntityReference[] =      UNICODE_LITERAL_15(E,n,t,i,t,y,R,e,f,e,r,e,n,c,e);
 196     static const XMLCh format[] =               UNICODE_LITERAL_6(f,o,r,m,a,t);
 197     static const XMLCh _MetadataProvider[] =    UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
 198     static const XMLCh policyId[] =             UNICODE_LITERAL_8(p,o,l,i,c,y,I,d);
 199     static const XMLCh _TrustEngine[] =         UNICODE_LITERAL_11(T,r,u,s,t,E,n,g,i,n,e);
 200     static const XMLCh _type[] =                UNICODE_LITERAL_4(t,y,p,e);
 201 };
 202
 203 SimpleAggregationResolver::SimpleAggregationResolver(const DOMElement* e)
 204     : m_log(Category::getInstance(SHIBSP_LOGCAT".AttributeResolver.SimpleAggregation")), m_metadata(NULL), m_trust(NULL)
 205 {
 206 #ifdef _DEBUG
 207     xmltooling::NDC ndc("SimpleAggregationResolver");
 208 #endif
 209
 210     const XMLCh* pid = e ? e->getAttributeNS(NULL, policyId) : NULL;
 211     if (pid && *pid) {
 212         auto_ptr_char temp(pid);
 213         m_policyId = temp.get();
 214     }
 215
 216     pid = e ? e->getAttributeNS(NULL, attributeId) : NULL;
 217     if (pid && *pid) {
 218         char* dup = XMLString::transcode(pid);
 219         char* pos;
 220         char* start = dup;
 221         while (start && *start) {
 222             while (*start && isspace(*start))
 223                 start++;
 224             if (!*start)
 225                 break;
 226             pos = strchr(start,' ');
 227             if (pos)
 228                 *pos=0;
 229             m_attributeIds.push_back(start);
 230             start = pos ? pos+1 : NULL;
 231         }
 232         XMLString::release(&dup);
 233
 234         pid = e->getAttributeNS(NULL, format);
 235         if (pid && *pid)
 236             m_format = pid;
 237
 238     }
 239
 240     DOMElement* child = XMLHelper::getFirstChildElement(e, _MetadataProvider);
 241     if (child) {
 242         auto_ptr_char type(child->getAttributeNS(NULL, _type));
 243         if (!type.get() || !*type.get())
 244             throw ConfigurationException("MetadataProvider element missing type attribute.");
 245         m_log.info("building MetadataProvider of type %s...", type.get());
 246         auto_ptr<MetadataProvider> mp(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(type.get(), child));
 247         mp->init();
 248         m_metadata = mp.release();
 249     }
 250
 251     child = XMLHelper::getFirstChildElement(e,  _TrustEngine);
 252     if (child) {
 253         try {
 254             auto_ptr_char type(child->getAttributeNS(NULL, _type));
 255             if (!type.get() || !*type.get())
 256                 throw ConfigurationException("TrustEngine element missing type attribute.");
 257             m_log.info("building TrustEngine of type %s...", type.get());
 258             m_trust = XMLToolingConfig::getConfig().TrustEngineManager.newPlugin(type.get(), child);
 259         }
 260         catch (exception&) {
 261             delete m_metadata;
 262             throw;
 263         }
 264     }
 265
 266     child = XMLHelper::getFirstChildElement(e);
 267     while (child) {
 268         if (child->hasChildNodes() && XMLString::equals(child->getLocalName(), Entity)) {
 269             pid = child->getFirstChild()->getNodeValue();
 270             if (pid && *pid) {
 271                 auto_ptr_char tpid(pid);
 272                 m_sources.push_back(pair<string,bool>(tpid.get(),true));
 273             }
 274         }
 275         else if (child->hasChildNodes() && XMLString::equals(child->getLocalName(), EntityReference)) {
 276             pid = child->getFirstChild()->getNodeValue();
 277             if (pid && *pid) {
 278                 auto_ptr_char tpid(pid);
 279                 m_sources.push_back(pair<string,bool>(tpid.get(),false));
 280             }
 281         }
 282         else if (XMLHelper::isNodeNamed(child, samlconstants::SAML20_NS, saml2::Attribute::LOCAL_NAME)) {
 283             try {
 284                 auto_ptr<XMLObject> obj(saml2::AttributeBuilder::buildOneFromElement(child));
 285                 saml2::Attribute* down = dynamic_cast<saml2::Attribute*>(obj.get());
 286                 if (down) {
 287                     m_designators.push_back(down);
 288                     obj.release();
 289                 }
 290             }
 291             catch (exception& ex) {
 292                 m_log.error("exception loading attribute designator: %s", ex.what());
 293             }
 294         }
 295         child = XMLHelper::getNextSiblingElement(child);
 296     }
 297
 298 }
 299
 300 bool SimpleAggregationResolver::doQuery(SimpleAggregationContext& ctx, const char* entityID, const NameID* name) const
 301 {
 302 #ifdef _DEBUG
 303     xmltooling::NDC ndc("doQuery");
 304 #endif
 305     const Application& application = ctx.getApplication();
 306     MetadataProviderCriteria mc(application, entityID, &AttributeAuthorityDescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS);
 307     Locker mlocker(m_metadata);
 308     const AttributeAuthorityDescriptor* AA=NULL;
 309     pair<const EntityDescriptor*,const RoleDescriptor*> mdresult =
 310         (m_metadata ? m_metadata : application.getMetadataProvider())->getEntityDescriptor(mc);
 311     if (!mdresult.first) {
 312         m_log.warn("unable to locate metadata for provider (%s)", entityID);
 313         return false;
 314     }
 315     else if (!(AA=dynamic_cast<const AttributeAuthorityDescriptor*>(mdresult.second))) {
 316         m_log.warn("no SAML 2 AttributeAuthority role found in metadata for (%s)", entityID);
 317         return false;
 318     }
 319
 320     const PropertySet* relyingParty = application.getRelyingParty(mdresult.first);
 321
 322     // Locate policy key.
 323     const char* policyId = m_policyId.empty() ? application.getString("policyId").second : m_policyId.c_str();
 324
 325     // Access policy properties.
 326     const PropertySet* settings = application.getServiceProvider().getPolicySettings(policyId);
 327     pair<bool,bool> validate = settings->getBool("validate");
 328
 329     pair<bool,bool> signedAssertions = relyingParty->getBool("requireSignedAssertions");
 330     pair<bool,const char*> encryption = relyingParty->getString("encryption");
 331
 332     shibsp::SecurityPolicy policy(application, NULL, validate.first && validate.second, policyId);
 333     if (m_metadata)
 334         policy.setMetadataProvider(m_metadata);
 335     if (m_trust)
 336         policy.setTrustEngine(m_trust);
 337     policy.getAudiences().push_back(relyingParty->getXMLString("entityID").second);
 338
 339     MetadataCredentialCriteria mcc(*AA);
 340     shibsp::SOAPClient soaper(policy);
 341
 342     auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
 343     saml2p::StatusResponseType* srt=NULL;
 344     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 345     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !srt && ep!=endpoints.end(); ++ep) {
 346         if (!XMLString::equals((*ep)->getBinding(),binding.get())  || !(*ep)->getLocation())
 347             continue;
 348         auto_ptr_char loc((*ep)->getLocation());
 349         try {
 350             auto_ptr<saml2::Subject> subject(saml2::SubjectBuilder::buildSubject());
 351
 352             // Encrypt the NameID?
 353             if (encryption.first && (!strcmp(encryption.second, "true") || !strcmp(encryption.second, "back"))) {
 354                 auto_ptr<EncryptedID> encrypted(EncryptedIDBuilder::buildEncryptedID());
 355                 MetadataCredentialCriteria mcc(*AA);
 356                 encrypted->encrypt(
 357                     *name,
 358                     *(policy.getMetadataProvider()),
 359                     mcc,
 360                     false,
 361                     relyingParty->getXMLString("encryptionAlg").second
 362                     );
 363                 subject->setEncryptedID(encrypted.release());
 364             }
 365             else {
 366                 subject->setNameID(name->cloneNameID());
 367             }
 368
 369             saml2p::AttributeQuery* query = saml2p::AttributeQueryBuilder::buildAttributeQuery();
 370             query->setSubject(subject.release());
 371             Issuer* iss = IssuerBuilder::buildIssuer();
 372             iss->setName(relyingParty->getXMLString("entityID").second);
 373             query->setIssuer(iss);
 374             for (vector<saml2::Attribute*>::const_iterator ad = m_designators.begin(); ad!=m_designators.end(); ++ad)
 375                 query->getAttributes().push_back((*ad)->cloneAttribute());
 376
 377             SAML2SOAPClient client(soaper, false);
 378             client.sendSAML(query, application.getId(), mcc, loc.get());
 379             srt = client.receiveSAML();
 380         }
 381         catch (exception& ex) {
 382             m_log.error("exception during SAML query to %s: %s", loc.get(), ex.what());
 383             soaper.reset();
 384         }
 385     }
 386
 387     if (!srt) {
 388         m_log.error("unable to obtain a SAML response from attribute authority (%s)", entityID);
 389         return false;
 390     }
 391     saml2p::Response* response = dynamic_cast<saml2p::Response*>(srt);
 392     if (!response) {
 393         delete srt;
 394         m_log.error("message was not a samlp:Response");
 395         return true;
 396     }
 397     else if (!response->getStatus() || !response->getStatus()->getStatusCode() ||
 398             !XMLString::equals(response->getStatus()->getStatusCode()->getValue(), saml2p::StatusCode::SUCCESS)) {
 399         delete srt;
 400         m_log.error("attribute authority (%s) returned a SAML error", entityID);
 401         return true;
 402     }
 403
 404     const vector<saml2::Assertion*>& assertions = const_cast<const saml2p::Response*>(response)->getAssertions();
 405     if (assertions.empty()) {
 406         delete srt;
 407         m_log.warn("response from attribute authority (%s) was empty", entityID);
 408         return true;
 409     }
 410     else if (assertions.size()>1)
 411         m_log.warn("resolver only supports one assertion in the query response");
 412
 413     auto_ptr<saml2p::StatusResponseType> wrapper(srt);
 414     saml2::Assertion* newtoken = assertions.front();
 415
 416     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 417         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 418         return true;
 419     }
 420
 421     try {
 422         // We're going to insist that the assertion issuer is the same as the peer.
 423         // Reset the policy's message bits and extract them from the assertion.
 424         policy.reset(true);
 425         policy.setMessageID(newtoken->getID());
 426         policy.setIssueInstant(newtoken->getIssueInstantEpoch());
 427         policy.setIssuer(newtoken->getIssuer());
 428         policy.evaluate(*newtoken);
 429
 430         // Now we can check the security status of the policy.
 431         if (!policy.isAuthenticated())
 432             throw SecurityPolicyException("Security of SAML 2.0 query result not established.");
 433     }
 434     catch (exception& ex) {
 435         m_log.error("assertion failed policy validation: %s", ex.what());
 436         return true;
 437     }
 438
 439     newtoken->detach();
 440     wrapper.release();
 441     ctx.getResolvedAssertions().push_back(newtoken);
 442
 443     // Finally, extract and filter the result.
 444     try {
 445         AttributeExtractor* extractor = application.getAttributeExtractor();
 446         if (extractor) {
 447             Locker extlocker(extractor);
 448             extractor->extractAttributes(application, AA, *newtoken, ctx.getResolvedAttributes());
 449         }
 450
 451         AttributeFilter* filter = application.getAttributeFilter();
 452         if (filter) {
 453             BasicFilteringContext fc(application, ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 454             Locker filtlocker(filter);
 455             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 456         }
 457     }
 458     catch (exception& ex) {
 459         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 460         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), xmltooling::cleanup<shibsp::Attribute>());
 461         ctx.getResolvedAttributes().clear();
 462     }
 463
 464     return true;
 465 }
 466
 467 void SimpleAggregationResolver::resolveAttributes(ResolutionContext& ctx) const
 468 {
 469 #ifdef _DEBUG
 470     xmltooling::NDC ndc("resolveAttributes");
 471 #endif
 472
 473     SimpleAggregationContext& qctx = dynamic_cast<SimpleAggregationContext&>(ctx);
 474
 475     // First we manufacture the appropriate NameID to use.
 476     NameID* n=NULL;
 477     for (vector<string>::const_iterator a = m_attributeIds.begin(); !n && a != m_attributeIds.end(); ++a) {
 478         const Attribute* attr=NULL;
 479         if (qctx.getSession()) {
 480             // Input attributes should be available via multimap.
 481             pair<multimap<string,const Attribute*>::const_iterator, multimap<string,const Attribute*>::const_iterator> range =
 482                 qctx.getSession()->getIndexedAttributes().equal_range(*a);
 483             for (; !attr && range.first != range.second; ++range.first) {
 484                 if (range.first->second->valueCount() > 0)
 485                     attr = range.first->second;
 486             }
 487         }
 488         else if (qctx.getInputAttributes()) {
 489             // Have to loop over unindexed set.
 490             const vector<Attribute*>* matches = qctx.getInputAttributes();
 491             for (vector<Attribute*>::const_iterator match = matches->begin(); !attr && match != matches->end(); ++match) {
 492                 if (*a == (*match)->getId() && (*match)->valueCount() > 0)
 493                     attr = *match;
 494             }
 495         }
 496
 497         if (attr) {
 498             m_log.debug("using input attribute (%s) as identifier for queries", attr->getId());
 499             n = NameIDBuilder::buildNameID();
 500             const NameIDAttribute* down = dynamic_cast<const NameIDAttribute*>(attr);
 501             if (down) {
 502                 // We can create a NameID directly from the source material.
 503                 const NameIDAttribute::Value& v = down->getValues().front();
 504                 XMLCh* val = fromUTF8(v.m_Name.c_str());
 505                 n->setName(val);
 506                 delete[] val;
 507                 if (!v.m_Format.empty()) {
 508                     val = fromUTF8(v.m_Format.c_str());
 509                     n->setFormat(val);
 510                     delete[] val;
 511                 }
 512                 if (!v.m_NameQualifier.empty()) {
 513                     val = fromUTF8(v.m_NameQualifier.c_str());
 514                     n->setNameQualifier(val);
 515                     delete[] val;
 516                 }
 517                 if (!v.m_SPNameQualifier.empty()) {
 518                     val = fromUTF8(v.m_SPNameQualifier.c_str());
 519                     n->setSPNameQualifier(val);
 520                     delete[] val;
 521                 }
 522                 if (!v.m_SPProvidedID.empty()) {
 523                     val = fromUTF8(v.m_SPProvidedID.c_str());
 524                     n->setSPProvidedID(val);
 525                     delete[] val;
 526                 }
 527             }
 528             else {
 529                 // We have to mock up the NameID.
 530                 XMLCh* val = fromUTF8(attr->getSerializedValues().front().c_str());
 531                 n->setName(val);
 532                 delete[] val;
 533                 if (!m_format.empty())
 534                     n->setFormat(m_format.c_str());
 535             }
 536         }
 537     }
 538
 539     if (!n) {
 540         if (qctx.getNameID() && m_attributeIds.empty()) {
 541             m_log.debug("using authenticated NameID as identifier for queries");
 542         }
 543         else {
 544             m_log.warn("unable to resolve attributes, no suitable query identifier found");
 545             return;
 546         }
 547     }
 548
 549     auto_ptr<NameID> wrapper(n);
 550
 551     set<string> history;
 552
 553     // We have a master loop over all the possible sources of material.
 554     for (vector< pair<string,bool> >::const_iterator source = m_sources.begin(); source != m_sources.end(); ++source) {
 555         if (source->second) {
 556             // A literal entityID to query.
 557             if (history.count(source->first) == 0) {
 558                 m_log.debug("issuing SAML query to (%s)", source->first.c_str());
 559                 doQuery(qctx, source->first.c_str(), n ? n : qctx.getNameID());
 560                 history.insert(source->first);
 561             }
 562             else {
 563                 m_log.debug("skipping previously queried attribute source (%s)", source->first.c_str());
 564             }
 565         }
 566         else {
 567             m_log.debug("using attribute sources referenced in attribute (%s)", source->first.c_str());
 568             if (qctx.getSession()) {
 569                 // Input attributes should be available via multimap.
 570                 pair<multimap<string,const Attribute*>::const_iterator, multimap<string,const Attribute*>::const_iterator> range =
 571                     qctx.getSession()->getIndexedAttributes().equal_range(source->first);
 572                 for (; range.first != range.second; ++range.first) {
 573                     const vector<string>& links = range.first->second->getSerializedValues();
 574                     for (vector<string>::const_iterator link = links.begin(); link != links.end(); ++link) {
 575                         if (history.count(*link) == 0) {
 576                             m_log.debug("issuing SAML query to (%s)", link->c_str());
 577                             doQuery(qctx, link->c_str(), n ? n : qctx.getNameID());
 578                             history.insert(*link);
 579                         }
 580                         else {
 581                             m_log.debug("skipping previously queried attribute source (%s)", link->c_str());
 582                         }
 583                     }
 584                 }
 585             }
 586             else if (qctx.getInputAttributes()) {
 587                 // Have to loop over unindexed set.
 588                 const vector<Attribute*>* matches = qctx.getInputAttributes();
 589                 for (vector<Attribute*>::const_iterator match = matches->begin(); match != matches->end(); ++match) {
 590                     if (source->first == (*match)->getId()) {
 591                         const vector<string>& links = (*match)->getSerializedValues();
 592                         for (vector<string>::const_iterator link = links.begin(); link != links.end(); ++link) {
 593                             if (history.count(*link) == 0) {
 594                                 m_log.debug("issuing SAML query to (%s)", link->c_str());
 595                                 doQuery(qctx, link->c_str(), n ? n : qctx.getNameID());
 596                                 history.insert(*link);
 597                             }
 598                             else {
 599                                 m_log.debug("skipping previously queried attribute source (%s)", link->c_str());
 600                             }
 601                         }
 602                     }
 603                 }
 604             }
 605         }
 606     }
 607 }