shibsp/handler/impl/AssertionConsumerService.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  * AssertionConsumerService.cpp
  19  *
  20  * Base class for handlers that create sessions by consuming SSO protocol responses.
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "Application.h"
  26 #include "ServiceProvider.h"
  27 #include "SPRequest.h"
  28 #include "handler/AssertionConsumerService.h"
  29 #include "util/SPConstants.h"
  30
  31 # include <ctime>
  32 #ifndef SHIBSP_LITE
  33 # include "attribute/Attribute.h"
  34 # include "attribute/filtering/AttributeFilter.h"
  35 # include "attribute/filtering/BasicFilteringContext.h"
  36 # include "attribute/resolver/AttributeExtractor.h"
  37 # include "attribute/resolver/AttributeResolver.h"
  38 # include "attribute/resolver/ResolutionContext.h"
  39 # include "metadata/MetadataProviderCriteria.h"
  40 # include "security/SecurityPolicy.h"
  41 # include "security/SecurityPolicyProvider.h"
  42 # include <saml/exceptions.h>
  43 # include <saml/SAMLConfig.h>
  44 # include <saml/saml1/core/Assertions.h>
  45 # include <saml/saml2/metadata/Metadata.h>
  46 # include <saml/util/CommonDomainCookie.h>
  47 using namespace samlconstants;
  48 using opensaml::saml2md::MetadataProvider;
  49 using opensaml::saml2md::RoleDescriptor;
  50 using opensaml::saml2md::EntityDescriptor;
  51 using opensaml::saml2md::IDPSSODescriptor;
  52 using opensaml::saml2md::SPSSODescriptor;
  53 #else
  54 # include "lite/CommonDomainCookie.h"
  55 #endif
  56
  57 using namespace shibspconstants;
  58 using namespace shibsp;
  59 using namespace opensaml;
  60 using namespace xmltooling;
  61 using namespace std;
  62
  63 AssertionConsumerService::AssertionConsumerService(
  64     const DOMElement* e, const char* appId, Category& log, DOMNodeFilter* filter, const map<string,string>* remapper
  65     ) : AbstractHandler(e, log, filter, remapper)
  66 #ifndef SHIBSP_LITE
  67         ,m_decoder(nullptr), m_role(samlconstants::SAML20MD_NS, opensaml::saml2md::IDPSSODescriptor::LOCAL_NAME)
  68 #endif
  69 {
  70     if (!e)
  71         return;
  72     string address(appId);
  73     address += getString("Location").second;
  74     setAddress(address.c_str());
  75 #ifndef SHIBSP_LITE
  76     if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
  77         m_decoder = SAMLConfig::getConfig().MessageDecoderManager.newPlugin(
  78             getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
  79             );
  80         m_decoder->setArtifactResolver(SPConfig::getConfig().getArtifactResolver());
  81     }
  82 #endif
  83 }
  84
  85 AssertionConsumerService::~AssertionConsumerService()
  86 {
  87 #ifndef SHIBSP_LITE
  88     delete m_decoder;
  89 #endif
  90 }
  91
  92 pair<bool,long> AssertionConsumerService::run(SPRequest& request, bool isHandler) const
  93 {
  94     string relayState;
  95     SPConfig& conf = SPConfig::getConfig();
  96
  97     if (conf.isEnabled(SPConfig::OutOfProcess)) {
  98         // When out of process, we run natively and directly process the message.
  99         return processMessage(request.getApplication(), request, request);
 100     }
 101     else {
 102         // When not out of process, we remote all the message processing.
 103         vector<string> headers(1, "Cookie");
 104         DDF out,in = wrap(request, &headers);
 105         DDFJanitor jin(in), jout(out);
 106         out=request.getServiceProvider().getListenerService()->send(in);
 107         return unwrap(request, out);
 108     }
 109 }
 110
 111 void AssertionConsumerService::receive(DDF& in, ostream& out)
 112 {
 113     // Find application.
 114     const char* aid=in["application_id"].string();
 115     const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : nullptr;
 116     if (!app) {
 117         // Something's horribly wrong.
 118         m_log.error("couldn't find application (%s) for new session", aid ? aid : "(missing)");
 119         throw ConfigurationException("Unable to locate application for new session, deleted?");
 120     }
 121
 122     // Unpack the request.
 123     auto_ptr<HTTPRequest> req(getRequest(in));
 124
 125     // Wrap a response shim.
 126     DDF ret(nullptr);
 127     DDFJanitor jout(ret);
 128     auto_ptr<HTTPResponse> resp(getResponse(ret));
 129
 130     // Since we're remoted, the result should either be a throw, a false/0 return,
 131     // which we just return as an empty structure, or a response/redirect,
 132     // which we capture in the facade and send back.
 133     processMessage(*app, *req.get(), *resp.get());
 134     out << ret;
 135 }
 136
 137 pair<bool,long> AssertionConsumerService::processMessage(
 138     const Application& application, const HTTPRequest& httpRequest, HTTPResponse& httpResponse
 139     ) const
 140 {
 141 #ifndef SHIBSP_LITE
 142     // Locate policy key.
 143     pair<bool,const char*> policyId = getString("policyId", m_configNS.get());  // namespace-qualified if inside handler element
 144     if (!policyId.first)
 145         policyId = application.getString("policyId");   // unqualified in Application(s) element
 146
 147     // Lock metadata for use by policy.
 148     Locker metadataLocker(application.getMetadataProvider());
 149
 150     // Create the policy.
 151     auto_ptr<opensaml::SecurityPolicy> policy(
 152         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, &m_role, policyId.second)
 153         );
 154
 155     string relayState;
 156     try {
 157         // Decode the message and process it in a protocol-specific way.
 158         auto_ptr<XMLObject> msg(m_decoder->decode(relayState, httpRequest, *(policy.get())));
 159         if (!msg.get())
 160             throw BindingException("Failed to decode an SSO protocol response.");
 161         DDF postData = recoverPostData(application, httpRequest, httpResponse, relayState.c_str());
 162         DDFJanitor postjan(postData);
 163         recoverRelayState(application, httpRequest, httpResponse, relayState);
 164         implementProtocol(application, httpRequest, httpResponse, *(policy.get()), NULL, *msg.get());
 165
 166         auto_ptr_char issuer(policy->getIssuer() ? policy->getIssuer()->getName() : nullptr);
 167
 168         // History cookie.
 169         if (issuer.get() && *issuer.get())
 170             maintainHistory(application, httpRequest, httpResponse, issuer.get());
 171
 172         // Now redirect to the state value. By now, it should be set to *something* usable.
 173         // First check for POST data.
 174         if (!postData.islist()) {
 175             m_log.debug("ACS returning via redirect to: %s", relayState.c_str());
 176             return make_pair(true, httpResponse.sendRedirect(relayState.c_str()));
 177         }
 178         else {
 179             m_log.debug("ACS returning via POST to: %s", relayState.c_str());
 180             return make_pair(true, sendPostResponse(application, httpResponse, relayState.c_str(), postData));
 181         }
 182     }
 183     catch (XMLToolingException& ex) {
 184         // Check for isPassive error condition.
 185         const char* sc2 = ex.getProperty("statusCode2");
 186         if (sc2 && !strcmp(sc2, "urn:oasis:names:tc:SAML:2.0:status:NoPassive")) {
 187             pair<bool,bool> ignore = getBool("ignoreNoPassive", m_configNS.get());  // namespace-qualified if inside handler element
 188             if (ignore.first && ignore.second && !relayState.empty()) {
 189                 m_log.debug("ignoring SAML status of NoPassive and redirecting to resource...");
 190                 return make_pair(true, httpResponse.sendRedirect(relayState.c_str()));
 191             }
 192         }
 193         if (!relayState.empty())
 194             ex.addProperty("RelayState", relayState.c_str());
 195         throw;
 196     }
 197 #else
 198     throw ConfigurationException("Cannot process message using lite version of shibsp library.");
 199 #endif
 200 }
 201
 202 void AssertionConsumerService::checkAddress(const Application& application, const HTTPRequest& httpRequest, const char* issuedTo) const
 203 {
 204     if (!issuedTo || !*issuedTo)
 205         return;
 206
 207     const PropertySet* props=application.getPropertySet("Sessions");
 208     pair<bool,bool> checkAddress = props ? props->getBool("checkAddress") : make_pair(false,true);
 209     if (!checkAddress.first)
 210         checkAddress.second=true;
 211
 212     if (checkAddress.second) {
 213         m_log.debug("checking client address");
 214         if (httpRequest.getRemoteAddr() != issuedTo) {
 215             throw FatalProfileException(
 216                "Your client's current address ($client_addr) differs from the one used when you authenticated "
 217                 "to your identity provider. To correct this problem, you may need to bypass a proxy server. "
 218                 "Please contact your local support staff or help desk for assistance.",
 219                 namedparams(1,"client_addr",httpRequest.getRemoteAddr().c_str())
 220                 );
 221         }
 222     }
 223 }
 224
 225 #ifndef SHIBSP_LITE
 226
 227 const char* AssertionConsumerService::getType() const
 228 {
 229     return "AssertionConsumerService";
 230 }
 231
 232 void AssertionConsumerService::generateMetadata(SPSSODescriptor& role, const char* handlerURL) const
 233 {
 234     // Initial guess at index to use.
 235     pair<bool,unsigned int> ix = pair<bool,unsigned int>(false,0);
 236     if (!strncmp(handlerURL, "https", 5))
 237         ix = getUnsignedInt("sslIndex", shibspconstants::ASCII_SHIB2SPCONFIG_NS);
 238     if (!ix.first)
 239         ix = getUnsignedInt("index");
 240     if (!ix.first)
 241         ix.second = 1;
 242
 243     // Find maximum index in use and go one higher.
 244     const vector<saml2md::AssertionConsumerService*>& services = const_cast<const SPSSODescriptor&>(role).getAssertionConsumerServices();
 245     if (!services.empty() && ix.second <= services.back()->getIndex().second)
 246         ix.second = services.back()->getIndex().second + 1;
 247
 248     const char* loc = getString("Location").second;
 249     string hurl(handlerURL);
 250     if (*loc != '/')
 251         hurl += '/';
 252     hurl += loc;
 253     auto_ptr_XMLCh widen(hurl.c_str());
 254
 255     saml2md::AssertionConsumerService* ep = saml2md::AssertionConsumerServiceBuilder::buildAssertionConsumerService();
 256     ep->setLocation(widen.get());
 257     ep->setBinding(getXMLString("Binding").second);
 258     ep->setIndex(ix.second);
 259     role.getAssertionConsumerServices().push_back(ep);
 260 }
 261
 262 opensaml::SecurityPolicy* AssertionConsumerService::createSecurityPolicy(
 263     const Application& application, const xmltooling::QName* role, bool validate, const char* policyId
 264     ) const
 265 {
 266     return new SecurityPolicy(application, role, validate, policyId);
 267 }
 268
 269 class SHIBSP_DLLLOCAL DummyContext : public ResolutionContext
 270 {
 271 public:
 272     DummyContext(const vector<Attribute*>& attributes) : m_attributes(attributes) {
 273     }
 274
 275     virtual ~DummyContext() {
 276         for_each(m_attributes.begin(), m_attributes.end(), xmltooling::cleanup<Attribute>());
 277     }
 278
 279     vector<Attribute*>& getResolvedAttributes() {
 280         return m_attributes;
 281     }
 282     vector<Assertion*>& getResolvedAssertions() {
 283         return m_tokens;
 284     }
 285
 286 private:
 287     vector<Attribute*> m_attributes;
 288     static vector<Assertion*> m_tokens; // never any tokens, so just share an empty vector
 289 };
 290
 291 vector<Assertion*> DummyContext::m_tokens;
 292
 293 ResolutionContext* AssertionConsumerService::resolveAttributes(
 294     const Application& application,
 295     const saml2md::RoleDescriptor* issuer,
 296     const XMLCh* protocol,
 297     const saml1::NameIdentifier* v1nameid,
 298     const saml2::NameID* nameid,
 299     const XMLCh* authncontext_class,
 300     const XMLCh* authncontext_decl,
 301     const vector<const Assertion*>* tokens
 302     ) const
 303 {
 304     // First we do the extraction of any pushed information, including from metadata.
 305     vector<Attribute*> resolvedAttributes;
 306     AttributeExtractor* extractor = application.getAttributeExtractor();
 307     if (extractor) {
 308         Locker extlocker(extractor);
 309         if (issuer) {
 310             pair<bool,const char*> mprefix = application.getString("metadataAttributePrefix");
 311             if (mprefix.first) {
 312                 m_log.debug("extracting metadata-derived attributes...");
 313                 try {
 314                     // We pass nullptr for "issuer" because the IdP isn't the one asserting metadata-based attributes.
 315                     extractor->extractAttributes(application, nullptr, *issuer, resolvedAttributes);
 316                     for (vector<Attribute*>::iterator a = resolvedAttributes.begin(); a != resolvedAttributes.end(); ++a) {
 317                         vector<string>& ids = (*a)->getAliases();
 318                         for (vector<string>::iterator id = ids.begin(); id != ids.end(); ++id)
 319                             *id = mprefix.second + *id;
 320                     }
 321                 }
 322                 catch (exception& ex) {
 323                     m_log.error("caught exception extracting attributes: %s", ex.what());
 324                 }
 325             }
 326         }
 327         m_log.debug("extracting pushed attributes...");
 328         if (v1nameid) {
 329             try {
 330                 extractor->extractAttributes(application, issuer, *v1nameid, resolvedAttributes);
 331             }
 332             catch (exception& ex) {
 333                 m_log.error("caught exception extracting attributes: %s", ex.what());
 334             }
 335         }
 336         else if (nameid) {
 337             try {
 338                 extractor->extractAttributes(application, issuer, *nameid, resolvedAttributes);
 339             }
 340             catch (exception& ex) {
 341                 m_log.error("caught exception extracting attributes: %s", ex.what());
 342             }
 343         }
 344         if (tokens) {
 345             for (vector<const Assertion*>::const_iterator t = tokens->begin(); t!=tokens->end(); ++t) {
 346                 try {
 347                     extractor->extractAttributes(application, issuer, *(*t), resolvedAttributes);
 348                 }
 349                 catch (exception& ex) {
 350                     m_log.error("caught exception extracting attributes: %s", ex.what());
 351                 }
 352             }
 353         }
 354
 355         AttributeFilter* filter = application.getAttributeFilter();
 356         if (filter && !resolvedAttributes.empty()) {
 357             BasicFilteringContext fc(application, resolvedAttributes, issuer, authncontext_class);
 358             Locker filtlocker(filter);
 359             try {
 360                 filter->filterAttributes(fc, resolvedAttributes);
 361             }
 362             catch (exception& ex) {
 363                 m_log.error("caught exception filtering attributes: %s", ex.what());
 364                 m_log.error("dumping extracted attributes due to filtering exception");
 365                 for_each(resolvedAttributes.begin(), resolvedAttributes.end(), xmltooling::cleanup<shibsp::Attribute>());
 366                 resolvedAttributes.clear();
 367             }
 368         }
 369     }
 370     else {
 371         m_log.warn("no AttributeExtractor plugin installed, check log during startup");
 372     }
 373
 374     try {
 375         AttributeResolver* resolver = application.getAttributeResolver();
 376         if (resolver) {
 377             m_log.debug("resolving attributes...");
 378
 379             Locker locker(resolver);
 380             auto_ptr<ResolutionContext> ctx(
 381                 resolver->createResolutionContext(
 382                     application,
 383                     issuer ? dynamic_cast<const saml2md::EntityDescriptor*>(issuer->getParent()) : nullptr,
 384                     protocol,
 385                     nameid,
 386                     authncontext_class,
 387                     authncontext_decl,
 388                     tokens,
 389                     &resolvedAttributes
 390                     )
 391                 );
 392             resolver->resolveAttributes(*ctx.get());
 393             // Copy over any pushed attributes.
 394             if (!resolvedAttributes.empty())
 395                 ctx->getResolvedAttributes().insert(ctx->getResolvedAttributes().end(), resolvedAttributes.begin(), resolvedAttributes.end());
 396             return ctx.release();
 397         }
 398     }
 399     catch (exception& ex) {
 400         m_log.error("attribute resolution failed: %s", ex.what());
 401     }
 402
 403     if (!resolvedAttributes.empty())
 404         return new DummyContext(resolvedAttributes);
 405     return nullptr;
 406 }
 407
 408 void AssertionConsumerService::extractMessageDetails(const Assertion& assertion, const XMLCh* protocol, opensaml::SecurityPolicy& policy) const
 409 {
 410     policy.setMessageID(assertion.getID());
 411     policy.setIssueInstant(assertion.getIssueInstantEpoch());
 412
 413     if (XMLString::equals(assertion.getElementQName().getNamespaceURI(), samlconstants::SAML20_NS)) {
 414         const saml2::Assertion* a2 = dynamic_cast<const saml2::Assertion*>(&assertion);
 415         if (a2) {
 416             m_log.debug("extracting issuer from SAML 2.0 assertion");
 417             policy.setIssuer(a2->getIssuer());
 418         }
 419     }
 420     else {
 421         const saml1::Assertion* a1 = dynamic_cast<const saml1::Assertion*>(&assertion);
 422         if (a1) {
 423             m_log.debug("extracting issuer from SAML 1.x assertion");
 424             policy.setIssuer(a1->getIssuer());
 425         }
 426     }
 427
 428     if (policy.getIssuer() && !policy.getIssuerMetadata() && policy.getMetadataProvider()) {
 429         if (policy.getIssuer()->getFormat() && !XMLString::equals(policy.getIssuer()->getFormat(), saml2::NameIDType::ENTITY)) {
 430             m_log.warn("non-system entity issuer, skipping metadata lookup");
 431             return;
 432         }
 433         m_log.debug("searching metadata for assertion issuer...");
 434         pair<const EntityDescriptor*,const RoleDescriptor*> entity;
 435         MetadataProvider::Criteria& mc = policy.getMetadataProviderCriteria();
 436         mc.entityID_unicode = policy.getIssuer()->getName();
 437         mc.role = &IDPSSODescriptor::ELEMENT_QNAME;
 438         mc.protocol = protocol;
 439         entity = policy.getMetadataProvider()->getEntityDescriptor(mc);
 440         if (!entity.first) {
 441             auto_ptr_char iname(policy.getIssuer()->getName());
 442             m_log.warn("no metadata found, can't establish identity of issuer (%s)", iname.get());
 443         }
 444         else if (!entity.second) {
 445             m_log.warn("unable to find compatible IdP role in metadata");
 446         }
 447         else {
 448             policy.setIssuerMetadata(entity.second);
 449         }
 450     }
 451 }
 452
 453 #endif
 454
 455 void AssertionConsumerService::maintainHistory(
 456     const Application& application, const HTTPRequest& request, HTTPResponse& response, const char* entityID
 457     ) const
 458 {
 459     static const char* defProps="; path=/";
 460
 461     const PropertySet* sessionProps=application.getPropertySet("Sessions");
 462     pair<bool,bool> idpHistory=sessionProps->getBool("idpHistory");
 463
 464     if (idpHistory.first && idpHistory.second) {
 465         pair<bool,const char*> cookieProps=sessionProps->getString("cookieProps");
 466         if (!cookieProps.first)
 467             cookieProps.second=defProps;
 468
 469         // Set an IdP history cookie locally (essentially just a CDC).
 470         CommonDomainCookie cdc(request.getCookie(CommonDomainCookie::CDCName));
 471
 472         // Either leave in memory or set an expiration.
 473         pair<bool,unsigned int> days=sessionProps->getUnsignedInt("idpHistoryDays");
 474         if (!days.first || days.second==0) {
 475             string c = string(cdc.set(entityID)) + cookieProps.second;
 476             response.setCookie(CommonDomainCookie::CDCName, c.c_str());
 477         }
 478         else {
 479             time_t now=time(nullptr) + (days.second * 24 * 60 * 60);
 480 #ifdef HAVE_GMTIME_R
 481             struct tm res;
 482             struct tm* ptime=gmtime_r(&now,&res);
 483 #else
 484             struct tm* ptime=gmtime(&now);
 485 #endif
 486             char timebuf[64];
 487             strftime(timebuf,64,"%a, %d %b %Y %H:%M:%S GMT",ptime);
 488             string c = string(cdc.set(entityID)) + cookieProps.second + "; expires=" + timebuf;
 489             response.setCookie(CommonDomainCookie::CDCName, c.c_str());
 490         }
 491     }
 492 }