shibsp/attribute/resolver/impl/QueryAttributeResolver.cpp

   1 /*
   2  *  Copyright 2001-2007 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/Attribute.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 "util/SPConstants.h"
  35
  36 #include <log4cpp/Category.hh>
  37 #include <saml/exceptions.h>
  38 #include <saml/binding/SecurityPolicy.h>
  39 #include <saml/saml1/binding/SAML1SOAPClient.h>
  40 #include <saml/saml1/core/Assertions.h>
  41 #include <saml/saml1/core/Protocols.h>
  42 #include <saml/saml1/profile/AssertionValidator.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/MetadataProvider.h>
  47 #include <saml/saml2/profile/AssertionValidator.h>
  48 #include <xmltooling/util/NDC.h>
  49 #include <xmltooling/util/XMLHelper.h>
  50 #include <xercesc/util/XMLUniDefs.hpp>
  51
  52 using namespace shibsp;
  53 using namespace opensaml::saml1;
  54 using namespace opensaml::saml1p;
  55 using namespace opensaml::saml2;
  56 using namespace opensaml::saml2p;
  57 using namespace opensaml::saml2md;
  58 using namespace opensaml;
  59 using namespace xmltooling;
  60 using namespace log4cpp;
  61 using namespace std;
  62
  63 namespace shibsp {
  64
  65     class SHIBSP_DLLLOCAL QueryContext : public ResolutionContext
  66     {
  67     public:
  68         QueryContext(const Application& application, const Session& session)
  69             : m_query(true), m_app(application), m_session(&session), m_metadata(NULL), m_entity(NULL), m_nameid(NULL) {
  70         }
  71
  72         QueryContext(
  73             const Application& application,
  74             const EntityDescriptor* issuer,
  75             const NameID* nameid,
  76             const char* authncontext_class=NULL,
  77             const char* authncontext_decl=NULL,
  78             const vector<const opensaml::Assertion*>* tokens=NULL,
  79             const multimap<string,Attribute*>* attributes=NULL
  80             ) : m_query(true), m_app(application), m_session(NULL), m_metadata(NULL), m_entity(issuer),
  81                 m_nameid(nameid), m_class(authncontext_class), m_decl(authncontext_decl) {
  82
  83             if (tokens) {
  84                 for (vector<const opensaml::Assertion*>::const_iterator t = tokens->begin(); t!=tokens->end(); ++t) {
  85                     const saml2::Assertion* token2 = dynamic_cast<const saml2::Assertion*>(*t);
  86                     if (token2 && !token2->getAttributeStatements().empty()) {
  87                         m_query = false;
  88                     }
  89                     else {
  90                         const saml1::Assertion* token1 = dynamic_cast<const saml1::Assertion*>(*t);
  91                         if (token1 && !token1->getAttributeStatements().empty()) {
  92                             m_query = false;
  93                         }
  94                     }
  95                 }
  96             }
  97         }
  98
  99         ~QueryContext() {
 100             if (m_metadata)
 101                 m_metadata->unlock();
 102             for_each(m_attributes.begin(), m_attributes.end(), cleanup_pair<string,shibsp::Attribute>());
 103             for_each(m_assertions.begin(), m_assertions.end(), xmltooling::cleanup<opensaml::Assertion>());
 104         }
 105
 106         bool doQuery() const {
 107             return m_query;
 108         }
 109
 110         const Application& getApplication() const {
 111             return m_app;
 112         }
 113         const EntityDescriptor* getEntityDescriptor() const {
 114             if (m_entity)
 115                 return m_entity;
 116             if (m_session && m_session->getEntityID()) {
 117                 m_metadata = m_app.getMetadataProvider();
 118                 if (m_metadata) {
 119                     m_metadata->lock();
 120                     return m_entity = m_metadata->getEntityDescriptor(m_session->getEntityID());
 121                 }
 122             }
 123             return NULL;
 124         }
 125         const NameID* getNameID() const {
 126             return m_session ? m_session->getNameID() : m_nameid;
 127         }
 128         const char* getClassRef() const {
 129             return m_session ? m_session->getAuthnContextClassRef() :  m_class;
 130         }
 131         const char* getDeclRef() const {
 132             return m_session ? m_session->getAuthnContextDeclRef() : m_decl;
 133         }
 134         const Session* getSession() const {
 135             return m_session;
 136         }
 137         multimap<string,shibsp::Attribute*>& getResolvedAttributes() {
 138             return m_attributes;
 139         }
 140         vector<opensaml::Assertion*>& getResolvedAssertions() {
 141             return m_assertions;
 142         }
 143
 144     private:
 145         bool m_query;
 146         const Application& m_app;
 147         const Session* m_session;
 148         mutable MetadataProvider* m_metadata;
 149         mutable const EntityDescriptor* m_entity;
 150         const NameID* m_nameid;
 151         const char* m_class;
 152         const char* m_decl;
 153         multimap<string,shibsp::Attribute*> m_attributes;
 154         vector<opensaml::Assertion*> m_assertions;
 155     };
 156
 157     class SHIBSP_DLLLOCAL QueryResolver : public AttributeResolver
 158     {
 159     public:
 160         QueryResolver(const DOMElement* e);
 161         ~QueryResolver() {
 162             for_each(m_SAML1Designators.begin(), m_SAML1Designators.end(), xmltooling::cleanup<AttributeDesignator>());
 163             for_each(m_SAML2Designators.begin(), m_SAML2Designators.end(), xmltooling::cleanup<saml2::Attribute>());
 164         }
 165
 166         Lockable* lock() {return this;}
 167         void unlock() {}
 168
 169         ResolutionContext* createResolutionContext(
 170             const Application& application,
 171             const EntityDescriptor* issuer,
 172             const NameID* nameid,
 173             const char* authncontext_class=NULL,
 174             const char* authncontext_decl=NULL,
 175             const vector<const opensaml::Assertion*>* tokens=NULL,
 176             const multimap<string,shibsp::Attribute*>* attributes=NULL
 177             ) const {
 178             return new QueryContext(application,issuer,nameid,authncontext_class,authncontext_decl,tokens,attributes);
 179         }
 180
 181         ResolutionContext* createResolutionContext(const Application& application, const Session& session) const {
 182             return new QueryContext(application,session);
 183         }
 184
 185         void resolveAttributes(ResolutionContext& ctx) const;
 186
 187     private:
 188         bool SAML1Query(QueryContext& ctx) const;
 189         bool SAML2Query(QueryContext& ctx) const;
 190
 191         Category& m_log;
 192         vector<AttributeDesignator*> m_SAML1Designators;
 193         vector<saml2::Attribute*> m_SAML2Designators;
 194     };
 195
 196     AttributeResolver* SHIBSP_DLLLOCAL QueryResolverFactory(const DOMElement* const & e)
 197     {
 198         return new QueryResolver(e);
 199     }
 200
 201 };
 202
 203 void SHIBSP_API shibsp::registerAttributeResolvers()
 204 {
 205     SPConfig::getConfig().AttributeResolverManager.registerFactory(QUERY_ATTRIBUTE_RESOLVER, QueryResolverFactory);
 206 }
 207
 208 QueryResolver::QueryResolver(const DOMElement* e) : m_log(Category::getInstance(SHIBSP_LOGCAT".AttributeResolver"))
 209 {
 210 #ifdef _DEBUG
 211     xmltooling::NDC ndc("QueryResolver");
 212 #endif
 213
 214     DOMElement* child = XMLHelper::getFirstChildElement(e);
 215     while (child) {
 216         try {
 217             if (XMLHelper::isNodeNamed(e, samlconstants::SAML20_NS, saml2::Attribute::LOCAL_NAME)) {
 218                 auto_ptr<XMLObject> obj(saml2::AttributeBuilder::buildOneFromElement(child));
 219                 saml2::Attribute* down = dynamic_cast<saml2::Attribute*>(obj.get());
 220                 if (down) {
 221                     m_SAML2Designators.push_back(down);
 222                     obj.release();
 223                 }
 224             }
 225             else if (XMLHelper::isNodeNamed(e, samlconstants::SAML1P_NS, AttributeDesignator::LOCAL_NAME)) {
 226                 auto_ptr<XMLObject> obj(AttributeDesignatorBuilder::buildOneFromElement(child));
 227                 AttributeDesignator* down = dynamic_cast<AttributeDesignator*>(obj.get());
 228                 if (down) {
 229                     m_SAML1Designators.push_back(down);
 230                     obj.release();
 231                 }
 232             }
 233         }
 234         catch (exception& ex) {
 235             m_log.error("exception loading attribute designator: %s", ex.what());
 236         }
 237         child = XMLHelper::getNextSiblingElement(child);
 238     }
 239 }
 240
 241 bool QueryResolver::SAML1Query(QueryContext& ctx) const
 242 {
 243 #ifdef _DEBUG
 244     xmltooling::NDC ndc("query");
 245 #endif
 246
 247     int version = 1;
 248     const AttributeAuthorityDescriptor* AA = ctx.getEntityDescriptor()->getAttributeAuthorityDescriptor(samlconstants::SAML11_PROTOCOL_ENUM);
 249     if (!AA) {
 250         AA = ctx.getEntityDescriptor()->getAttributeAuthorityDescriptor(samlconstants::SAML10_PROTOCOL_ENUM);
 251         version = 0;
 252     }
 253     if (!AA) {
 254         m_log.info("no SAML 1.x AttributeAuthority role found in metadata");
 255         return false;
 256     }
 257
 258     shibsp::SecurityPolicy policy(ctx.getApplication());
 259     MetadataCredentialCriteria mcc(*AA);
 260     shibsp::SOAPClient soaper(policy);
 261     const PropertySet* policySettings =
 262         ctx.getApplication().getServiceProvider().getPolicySettings(ctx.getApplication().getString("policyId").second);
 263     pair<bool,bool> signedAssertions = policySettings->getBool("signedAssertions");
 264
 265     auto_ptr_XMLCh binding(samlconstants::SAML1_BINDING_SOAP);
 266     saml1p::Response* response=NULL;
 267     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 268     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !response && ep!=endpoints.end(); ++ep) {
 269         try {
 270             if (!XMLString::equals((*ep)->getBinding(),binding.get()))
 271                 continue;
 272             auto_ptr_char loc((*ep)->getLocation());
 273             auto_ptr_XMLCh issuer(ctx.getApplication().getString("entityID").second);
 274             NameIdentifier* nameid = NameIdentifierBuilder::buildNameIdentifier();
 275             nameid->setName(ctx.getNameID()->getName());
 276             nameid->setFormat(ctx.getNameID()->getFormat());
 277             nameid->setNameQualifier(ctx.getNameID()->getNameQualifier());
 278             saml1::Subject* subject = saml1::SubjectBuilder::buildSubject();
 279             subject->setNameIdentifier(nameid);
 280             saml1p::AttributeQuery* query = saml1p::AttributeQueryBuilder::buildAttributeQuery();
 281             query->setSubject(subject);
 282             query->setResource(issuer.get());
 283             for (vector<AttributeDesignator*>::const_iterator ad = m_SAML1Designators.begin(); ad!=m_SAML1Designators.end(); ++ad)
 284                 query->getAttributeDesignators().push_back((*ad)->cloneAttributeDesignator());
 285             Request* request = RequestBuilder::buildRequest();
 286             request->setAttributeQuery(query);
 287             request->setMinorVersion(version);
 288
 289             SAML1SOAPClient client(soaper);
 290             client.sendSAML(request, mcc, loc.get());
 291             response = client.receiveSAML();
 292         }
 293         catch (exception& ex) {
 294             m_log.error("exception making SAML query: %s", ex.what());
 295             soaper.reset();
 296         }
 297     }
 298
 299     if (!response) {
 300         m_log.error("unable to successfully query for attributes");
 301         return false;
 302     }
 303
 304     const vector<saml1::Assertion*>& assertions = const_cast<const saml1p::Response*>(response)->getAssertions();
 305     if (assertions.size()>1)
 306         m_log.warn("simple resolver only supports one assertion in the query response");
 307
 308     auto_ptr<saml1p::Response> wrapper(response);
 309     saml1::Assertion* newtoken = assertions.front();
 310
 311     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 312         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 313         return true;
 314     }
 315
 316     try {
 317         policy.evaluate(*newtoken);
 318         if (!policy.isSecure())
 319             throw SecurityPolicyException("Security of SAML 1.x query result not established.");
 320         saml1::AssertionValidator tokval(ctx.getApplication().getAudiences(), time(NULL));
 321         tokval.validateAssertion(*newtoken);
 322     }
 323     catch (exception& ex) {
 324         m_log.error("assertion failed policy/validation: %s", ex.what());
 325         return true;
 326     }
 327
 328     newtoken->detach();
 329     wrapper.release();
 330     ctx.getResolvedAssertions().push_back(newtoken);
 331
 332     // Finally, extract and filter the result.
 333     try {
 334         AttributeExtractor* extractor = ctx.getApplication().getAttributeExtractor();
 335         if (extractor) {
 336             Locker extlocker(extractor);
 337             extractor->extractAttributes(ctx.getApplication(), AA, *newtoken, ctx.getResolvedAttributes());
 338         }
 339
 340         AttributeFilter* filter = ctx.getApplication().getAttributeFilter();
 341         if (filter) {
 342             BasicFilteringContext fc(ctx.getApplication(), ctx.getResolvedAttributes(), AA, ctx.getClassRef(), ctx.getDeclRef());
 343             Locker filtlocker(filter);
 344             filter->filterAttributes(fc, ctx.getResolvedAttributes());
 345         }
 346     }
 347     catch (exception& ex) {
 348         m_log.error("caught exception extracting/filtering attributes from query result: %s", ex.what());
 349         for_each(ctx.getResolvedAttributes().begin(), ctx.getResolvedAttributes().end(), cleanup_pair<string,shibsp::Attribute>());
 350         ctx.getResolvedAttributes().clear();
 351     }
 352
 353     return true;
 354 }
 355
 356 bool QueryResolver::SAML2Query(QueryContext& ctx) const
 357 {
 358 #ifdef _DEBUG
 359     xmltooling::NDC ndc("query");
 360 #endif
 361
 362     const AttributeAuthorityDescriptor* AA = ctx.getEntityDescriptor()->getAttributeAuthorityDescriptor(samlconstants::SAML20P_NS);
 363     if (!AA) {
 364         m_log.info("no SAML 2 AttributeAuthority role found in metadata");
 365         return false;
 366     }
 367
 368     shibsp::SecurityPolicy policy(ctx.getApplication());
 369     MetadataCredentialCriteria mcc(*AA);
 370     shibsp::SOAPClient soaper(policy);
 371     const PropertySet* policySettings =
 372         ctx.getApplication().getServiceProvider().getPolicySettings(ctx.getApplication().getString("policyId").second);
 373     pair<bool,bool> signedAssertions = policySettings->getBool("signedAssertions");
 374
 375     auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
 376     saml2p::StatusResponseType* srt=NULL;
 377     const vector<AttributeService*>& endpoints=AA->getAttributeServices();
 378     for (vector<AttributeService*>::const_iterator ep=endpoints.begin(); !srt && ep!=endpoints.end(); ++ep) {
 379         try {
 380             if (!XMLString::equals((*ep)->getBinding(),binding.get()))
 381                 continue;
 382             auto_ptr_char loc((*ep)->getLocation());
 383             auto_ptr_XMLCh issuer(ctx.getApplication().getString("entityID").second);
 384             saml2::Subject* subject = saml2::SubjectBuilder::buildSubject();
 385             subject->setNameID(ctx.getNameID()->cloneNameID());
 386             saml2p::AttributeQuery* query = saml2p::AttributeQueryBuilder::buildAttributeQuery();
 387             query->setSubject(subject);
 388             Issuer* iss = IssuerBuilder::buildIssuer();
 389             iss->setName(issuer.get());
 390             query->setIssuer(iss);
 391             for (vector<saml2::Attribute*>::const_iterator ad = m_SAML2Designators.begin(); ad!=m_SAML2Designators.end(); ++ad)
 392                 query->getAttributes().push_back((*ad)->cloneAttribute());
 393
 394             SAML2SOAPClient client(soaper);
 395             client.sendSAML(query, mcc, loc.get());
 396             srt = client.receiveSAML();
 397         }
 398         catch (exception& ex) {
 399             m_log.error("exception making SAML query: %s", ex.what());
 400             soaper.reset();
 401         }
 402     }
 403
 404     if (!srt) {
 405         m_log.error("unable to successfully query for attributes");
 406         return false;
 407     }
 408     saml2p::Response* response = dynamic_cast<saml2p::Response*>(srt);
 409     if (!response) {
 410         delete srt;
 411         m_log.error("message was not a samlp:Response");
 412         return true;
 413     }
 414
 415     const vector<saml2::Assertion*>& assertions = const_cast<const saml2p::Response*>(response)->getAssertions();
 416     if (assertions.size()>1)
 417         m_log.warn("simple resolver only supports one assertion in the query response");
 418
 419     auto_ptr<saml2p::Response> wrapper(response);
 420     saml2::Assertion* newtoken = assertions.front();
 421
 422     if (!newtoken->getSignature() && signedAssertions.first && signedAssertions.second) {
 423         m_log.error("assertion unsigned, rejecting it based on signedAssertions policy");
 424         return true;
 425     }
 426
 427     try {
 428         policy.evaluate(*newtoken);
 429         if (!policy.isSecure())
 430             throw SecurityPolicyException("Security of SAML 2.0 query result not established.");
 431         saml2::AssertionValidator tokval(ctx.getApplication().getAudiences(), time(NULL));
 432         tokval.validateAssertion(*newtoken);
 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 = ctx.getApplication().getAttributeExtractor();
 446         if (extractor) {
 447             Locker extlocker(extractor);
 448             extractor->extractAttributes(ctx.getApplication(), AA, *newtoken, ctx.getResolvedAttributes());
 449         }
 450
 451         AttributeFilter* filter = ctx.getApplication().getAttributeFilter();
 452         if (filter) {
 453             BasicFilteringContext fc(ctx.getApplication(), 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(), cleanup_pair<string,shibsp::Attribute>());
 461         ctx.getResolvedAttributes().clear();
 462     }
 463
 464     return true;
 465 }
 466
 467 void QueryResolver::resolveAttributes(ResolutionContext& ctx) const
 468 {
 469 #ifdef _DEBUG
 470     xmltooling::NDC ndc("resolveAttributes");
 471 #endif
 472
 473     QueryContext& qctx = dynamic_cast<QueryContext&>(ctx);
 474     if (!qctx.doQuery()) {
 475         m_log.debug("found AttributeStatement in input to new session, skipping query");
 476         return;
 477     }
 478
 479     if (qctx.getNameID() && qctx.getEntityDescriptor()) {
 480         m_log.debug("attempting SAML 2.0 attribute query");
 481         if (!SAML2Query(qctx)) {
 482             m_log.debug("attempting SAML 1.x attribute query");
 483             SAML1Query(qctx);
 484         }
 485     }
 486     m_log.warn("can't attempt attribute query, either no NameID or no metadata to use");
 487 }