shibsp/ServiceProvider.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  * ServiceProvider.cpp
  19  *
  20  * Interface to a Shibboleth ServiceProvider instance.
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "AccessControl.h"
  26 #include "Application.h"
  27 #include "ServiceProvider.h"
  28 #include "SessionCache.h"
  29 #include "SPRequest.h"
  30 #include "attribute/Attribute.h"
  31 #include "handler/SessionInitiator.h"
  32 #include "util/TemplateParameters.h"
  33
  34 #include <fstream>
  35 #include <sstream>
  36 #include <xmltooling/XMLToolingConfig.h>
  37 #include <xmltooling/util/NDC.h>
  38 #include <xmltooling/util/PathResolver.h>
  39 #include <xmltooling/util/URLEncoder.h>
  40 #include <xmltooling/util/XMLHelper.h>
  41
  42 using namespace shibsp;
  43 using namespace xmltooling::logging;
  44 using namespace xmltooling;
  45 using namespace std;
  46
  47 namespace shibsp {
  48     SHIBSP_DLLLOCAL PluginManager<ServiceProvider,string,const DOMElement*>::Factory XMLServiceProviderFactory;
  49
  50     long SHIBSP_DLLLOCAL sendError(
  51         Category& log, SPRequest& request, const Application* app, const char* page, TemplateParameters& tp, bool mayRedirect=true
  52         )
  53     {
  54         // The properties we need can be set in the RequestMap, or the Errors element.
  55         bool mderror = dynamic_cast<const opensaml::saml2md::MetadataException*>(tp.getRichException())!=NULL;
  56         pair<bool,const char*> redirectErrors = pair<bool,const char*>(false,NULL);
  57         pair<bool,const char*> pathname = pair<bool,const char*>(false,NULL);
  58
  59         // Strictly for error handling, detect a NULL application and point at the default.
  60         if (!app)
  61             app = request.getServiceProvider().getApplication("default");
  62
  63         const PropertySet* props=app->getPropertySet("Errors");
  64
  65         try {
  66             RequestMapper::Settings settings = request.getRequestSettings();
  67             if (mderror)
  68                 pathname = settings.first->getString("metadataError");
  69             if (!pathname.first) {
  70                 string pagename(page);
  71                 pagename += "Error";
  72                 pathname = settings.first->getString(pagename.c_str());
  73             }
  74             if (mayRedirect)
  75                 redirectErrors = settings.first->getString("redirectErrors");
  76         }
  77         catch (exception& ex) {
  78             log.error(ex.what());
  79         }
  80
  81         if (mayRedirect) {
  82             // Check for redirection on errors instead of template.
  83             if (!redirectErrors.first && props)
  84                 redirectErrors = props->getString("redirectErrors");
  85             if (redirectErrors.first) {
  86                 string loc(redirectErrors.second);
  87                 loc = loc + '?' + tp.toQueryString();
  88                 return request.sendRedirect(loc.c_str());
  89             }
  90         }
  91
  92         request.setContentType("text/html");
  93         request.setResponseHeader("Expires","01-Jan-1997 12:00:00 GMT");
  94         request.setResponseHeader("Cache-Control","private,no-store,no-cache");
  95
  96         if (!pathname.first && props) {
  97             if (mderror)
  98                 pathname=props->getString("metadata");
  99             if (!pathname.first)
 100                 pathname=props->getString(page);
 101         }
 102         if (pathname.first) {
 103             string fname(pathname.second);
 104             ifstream infile(XMLToolingConfig::getConfig().getPathResolver()->resolve(fname, PathResolver::XMLTOOLING_CFG_FILE).c_str());
 105             if (infile) {
 106                 tp.setPropertySet(props);
 107                 stringstream str;
 108                 XMLToolingConfig::getConfig().getTemplateEngine()->run(infile, str, tp, tp.getRichException());
 109                 return request.sendResponse(str);
 110             }
 111         }
 112
 113         if (!strcmp(page,"access")) {
 114             istringstream msg("Access Denied");
 115             return request.sendResponse(msg, HTTPResponse::XMLTOOLING_HTTP_STATUS_FORBIDDEN);
 116         }
 117
 118         log.error("sendError could not process error template (%s)", page);
 119         istringstream msg("Internal Server Error. Please contact the site administrator.");
 120         return request.sendError(msg);
 121     }
 122
 123     void SHIBSP_DLLLOCAL clearHeaders(SPRequest& request) {
 124         const Application& app = request.getApplication();
 125         app.clearHeader(request, "Shib-Session-ID", "HTTP_SHIB_SESSION_ID");
 126         app.clearHeader(request, "Shib-Identity-Provider", "HTTP_SHIB_IDENTITY_PROVIDER");
 127         app.clearHeader(request, "Shib-Authentication-Method", "HTTP_SHIB_AUTHENTICATION_METHOD");
 128         app.clearHeader(request, "Shib-Authentication-Instant", "HTTP_SHIB_AUTHENTICATION_INSTANT");
 129         app.clearHeader(request, "Shib-AuthnContext-Class", "HTTP_SHIB_AUTHNCONTEXT_CLASS");
 130         app.clearHeader(request, "Shib-AuthnContext-Decl", "HTTP_SHIB_AUTHNCONTEXT_DECL");
 131         app.clearHeader(request, "Shib-Assertion-Count", "HTTP_SHIB_ASSERTION_COUNT");
 132         app.clearAttributeHeaders(request);
 133         request.clearHeader("REMOTE_USER", "HTTP_REMOTE_USER");
 134     }
 135 };
 136
 137 void SHIBSP_API shibsp::registerServiceProviders()
 138 {
 139     SPConfig::getConfig().ServiceProviderManager.registerFactory(XML_SERVICE_PROVIDER, XMLServiceProviderFactory);
 140 }
 141
 142 pair<bool,long> ServiceProvider::doAuthentication(SPRequest& request, bool handler) const
 143 {
 144 #ifdef _DEBUG
 145     xmltooling::NDC ndc("doAuthentication");
 146 #endif
 147     Category& log = Category::getInstance(SHIBSP_LOGCAT".ServiceProvider");
 148
 149     const Application* app=NULL;
 150     string targetURL = request.getRequestURL();
 151
 152     try {
 153         RequestMapper::Settings settings = request.getRequestSettings();
 154         app = &(request.getApplication());
 155
 156         // If not SSL, check to see if we should block or redirect it.
 157         if (!request.isSecure()) {
 158             pair<bool,const char*> redirectToSSL = settings.first->getString("redirectToSSL");
 159             if (redirectToSSL.first) {
 160 #ifdef HAVE_STRCASECMP
 161                 if (!strcasecmp("GET",request.getMethod()) || !strcasecmp("HEAD",request.getMethod())) {
 162 #else
 163                 if (!stricmp("GET",request.getMethod()) || !stricmp("HEAD",request.getMethod())) {
 164 #endif
 165                     // Compute the new target URL
 166                     string redirectURL = string("https://") + request.getHostname();
 167                     if (strcmp(redirectToSSL.second,"443")) {
 168                         redirectURL = redirectURL + ':' + redirectToSSL.second;
 169                     }
 170                     redirectURL += request.getRequestURI();
 171                     return make_pair(true, request.sendRedirect(redirectURL.c_str()));
 172                 }
 173                 else {
 174                     TemplateParameters tp;
 175                     tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 176                     return make_pair(true,sendError(log, request, app, "ssl", tp, false));
 177                 }
 178             }
 179         }
 180
 181         const char* handlerURL=request.getHandlerURL(targetURL.c_str());
 182         if (!handlerURL)
 183             throw ConfigurationException("Cannot determine handler from resource URL, check configuration.");
 184
 185         // If the request URL contains the handler base URL for this application, either dispatch
 186         // directly (mainly Apache 2.0) or just pass back control.
 187         if (strstr(targetURL.c_str(),handlerURL)) {
 188             if (handler)
 189                 return doHandler(request);
 190             else
 191                 return make_pair(true, request.returnOK());
 192         }
 193
 194         // Three settings dictate how to proceed.
 195         pair<bool,const char*> authType = settings.first->getString("authType");
 196         pair<bool,bool> requireSession = settings.first->getBool("requireSession");
 197         pair<bool,const char*> requireSessionWith = settings.first->getString("requireSessionWith");
 198
 199         // If no session is required AND the AuthType (an Apache-derived concept) isn't shibboleth,
 200         // then we ignore this request and consider it unprotected. Apache might lie to us if
 201         // ShibBasicHijack is on, but that's up to it.
 202         if ((!requireSession.first || !requireSession.second) && !requireSessionWith.first &&
 203 #ifdef HAVE_STRCASECMP
 204                 (!authType.first || strcasecmp(authType.second,"shibboleth")))
 205 #else
 206                 (!authType.first || _stricmp(authType.second,"shibboleth")))
 207 #endif
 208             return make_pair(true,request.returnDecline());
 209
 210         // Fix for secadv 20050901
 211         clearHeaders(request);
 212
 213         Session* session = NULL;
 214         try {
 215             session = request.getSession();
 216         }
 217         catch (exception& e) {
 218             log.warn("error during session lookup: %s", e.what());
 219             // If it's not a retryable session failure, we throw to the outer handler for reporting.
 220             if (dynamic_cast<opensaml::RetryableProfileException*>(&e)==NULL)
 221                 throw;
 222         }
 223
 224         if (!session) {
 225             // No session.  Maybe that's acceptable?
 226             if ((!requireSession.first || !requireSession.second) && !requireSessionWith.first)
 227                 return make_pair(true,request.returnOK());
 228
 229             // No session, but we require one. Initiate a new session using the indicated method.
 230             const SessionInitiator* initiator=NULL;
 231             if (requireSessionWith.first) {
 232                 initiator=app->getSessionInitiatorById(requireSessionWith.second);
 233                 if (!initiator) {
 234                     throw ConfigurationException(
 235                         "No session initiator found with id ($1), check requireSessionWith command.", params(1,requireSessionWith.second)
 236                         );
 237                 }
 238             }
 239             else {
 240                 initiator=app->getDefaultSessionInitiator();
 241                 if (!initiator)
 242                     throw ConfigurationException("No default session initiator found, check configuration.");
 243             }
 244
 245             return initiator->run(request,false);
 246         }
 247
 248         // We're done.  Everything is okay.  Nothing to report.  Nothing to do..
 249         // Let the caller decide how to proceed.
 250         log.debug("doAuthentication succeeded");
 251         return make_pair(false,0L);
 252     }
 253     catch (exception& e) {
 254         TemplateParameters tp(&e);
 255         tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 256         return make_pair(true,sendError(log, request, app, "session", tp));
 257     }
 258 }
 259
 260 pair<bool,long> ServiceProvider::doAuthorization(SPRequest& request) const
 261 {
 262 #ifdef _DEBUG
 263     xmltooling::NDC ndc("doAuthorization");
 264 #endif
 265     Category& log = Category::getInstance(SHIBSP_LOGCAT".ServiceProvider");
 266
 267     const Application* app=NULL;
 268     string targetURL = request.getRequestURL();
 269
 270     try {
 271         RequestMapper::Settings settings = request.getRequestSettings();
 272         app = &(request.getApplication());
 273
 274         // Three settings dictate how to proceed.
 275         pair<bool,const char*> authType = settings.first->getString("authType");
 276         pair<bool,bool> requireSession = settings.first->getBool("requireSession");
 277         pair<bool,const char*> requireSessionWith = settings.first->getString("requireSessionWith");
 278
 279         // If no session is required AND the AuthType (an Apache-derived concept) isn't shibboleth,
 280         // then we ignore this request and consider it unprotected. Apache might lie to us if
 281         // ShibBasicHijack is on, but that's up to it.
 282         if ((!requireSession.first || !requireSession.second) && !requireSessionWith.first &&
 283 #ifdef HAVE_STRCASECMP
 284                 (!authType.first || strcasecmp(authType.second,"shibboleth")))
 285 #else
 286                 (!authType.first || _stricmp(authType.second,"shibboleth")))
 287 #endif
 288             return make_pair(true,request.returnDecline());
 289
 290         // Do we have an access control plugin?
 291         if (settings.second) {
 292             const Session* session = NULL;
 293             try {
 294                 session = request.getSession(false);
 295             }
 296             catch (exception& e) {
 297                 log.warn("unable to obtain session to pass to access control provider: %s", e.what());
 298             }
 299
 300             Locker acllock(settings.second);
 301             switch (settings.second->authorized(request,session)) {
 302                 case AccessControl::shib_acl_true:
 303                     log.debug("access control provider granted access");
 304                     return make_pair(true,request.returnOK());
 305
 306                 case AccessControl::shib_acl_false:
 307                 {
 308                     log.warn("access control provider denied access");
 309                     TemplateParameters tp;
 310                     tp.m_map["requestURL"] = targetURL;
 311                     return make_pair(true,sendError(log, request, app, "access", tp, false));
 312                 }
 313
 314                 default:
 315                     // Use the "DECLINE" interface to signal we don't know what to do.
 316                     return make_pair(true,request.returnDecline());
 317             }
 318         }
 319         else {
 320             return make_pair(true,request.returnDecline());
 321         }
 322     }
 323     catch (exception& e) {
 324         TemplateParameters tp(&e);
 325         tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 326         return make_pair(true,sendError(log, request, app, "access", tp));
 327     }
 328 }
 329
 330 pair<bool,long> ServiceProvider::doExport(SPRequest& request, bool requireSession) const
 331 {
 332 #ifdef _DEBUG
 333     xmltooling::NDC ndc("doExport");
 334 #endif
 335     Category& log = Category::getInstance(SHIBSP_LOGCAT".ServiceProvider");
 336
 337     const Application* app=NULL;
 338     string targetURL = request.getRequestURL();
 339
 340     try {
 341         RequestMapper::Settings settings = request.getRequestSettings();
 342         app = &(request.getApplication());
 343
 344         const Session* session = NULL;
 345         try {
 346             session = request.getSession(false);
 347         }
 348         catch (exception& e) {
 349             log.warn("unable to obtain session to export to request: %s", e.what());
 350                 // If we have to have a session, then this is a fatal error.
 351                 if (requireSession)
 352                         throw;
 353         }
 354
 355                 // Still no data?
 356         if (!session) {
 357                 if (requireSession)
 358                 throw opensaml::RetryableProfileException("Unable to obtain session to export to request.");
 359                 else
 360                         return make_pair(false,0L);     // just bail silently
 361         }
 362
 363         app->setHeader(request, "Shib-Application-ID", app->getId());
 364         app->setHeader(request, "Shib-Session-ID", session->getID());
 365
 366         // Export the IdP name and Authn method/context info.
 367         const char* hval = session->getEntityID();
 368         if (hval)
 369             app->setHeader(request, "Shib-Identity-Provider", hval);
 370         hval = session->getAuthnInstant();
 371         if (hval)
 372             app->setHeader(request, "Shib-Authentication-Instant", hval);
 373         hval = session->getAuthnContextClassRef();
 374         if (hval) {
 375             app->setHeader(request, "Shib-Authentication-Method", hval);
 376             app->setHeader(request, "Shib-AuthnContext-Class", hval);
 377         }
 378         hval = session->getAuthnContextDeclRef();
 379         if (hval)
 380             app->setHeader(request, "Shib-AuthnContext-Decl", hval);
 381
 382         // Maybe export the assertion keys.
 383         pair<bool,bool> exp=settings.first->getBool("exportAssertion");
 384         if (exp.first && exp.second) {
 385             const PropertySet* sessions=app->getPropertySet("Sessions");
 386             pair<bool,const char*> exportLocation = sessions ? sessions->getString("exportLocation") : pair<bool,const char*>(false,NULL);
 387             if (!exportLocation.first)
 388                 log.warn("can't export assertions without an exportLocation Sessions property");
 389             else {
 390                 const URLEncoder* encoder = XMLToolingConfig::getConfig().getURLEncoder();
 391                 string exportName = "Shib-Assertion-00";
 392                 string baseURL;
 393                 if (!strncmp(exportLocation.second, "http", 4))
 394                     baseURL = exportLocation.second;
 395                 else
 396                     baseURL = string(request.getHandlerURL(targetURL.c_str())) + exportLocation.second;
 397                 baseURL = baseURL + "?key=" + session->getID() + "&ID=";
 398                 const vector<const char*>& tokens = session->getAssertionIDs();
 399                 vector<const char*>::size_type count = 0;
 400                 for (vector<const char*>::const_iterator tokenids = tokens.begin(); tokenids!=tokens.end(); ++tokenids) {
 401                     count++;
 402                     *(exportName.rbegin()) = '0' + (count%10);
 403                     *(++exportName.rbegin()) = '0' + (count/10);
 404                     string fullURL = baseURL + encoder->encode(*tokenids);
 405                     app->setHeader(request, exportName.c_str(), fullURL.c_str());
 406                 }
 407                 app->setHeader(request, "Shib-Assertion-Count", exportName.c_str() + 15);
 408             }
 409         }
 410
 411         // Export the attributes.
 412         const multimap<string,const Attribute*>& attributes = session->getIndexedAttributes();
 413         for (multimap<string,const Attribute*>::const_iterator a = attributes.begin(); a!=attributes.end(); ++a) {
 414             string header(app->getSecureHeader(request, a->first.c_str()));
 415             const vector<string>& vals = a->second->getSerializedValues();
 416             for (vector<string>::const_iterator v = vals.begin(); v!=vals.end(); ++v) {
 417                 if (!header.empty())
 418                     header += ";";
 419                 string::size_type pos = v->find_first_of(';',string::size_type(0));
 420                 if (pos!=string::npos) {
 421                     string value(*v);
 422                     for (; pos != string::npos; pos = value.find_first_of(';',pos)) {
 423                         value.insert(pos, "\\");
 424                         pos += 2;
 425                     }
 426                     header += value;
 427                 }
 428                 else {
 429                     header += (*v);
 430                 }
 431             }
 432             app->setHeader(request, a->first.c_str(), header.c_str());
 433         }
 434
 435         // Check for REMOTE_USER.
 436         bool remoteUserSet = false;
 437         const vector<string>& rmids = app->getRemoteUserAttributeIds();
 438         for (vector<string>::const_iterator rmid = rmids.begin(); !remoteUserSet && rmid != rmids.end(); ++rmid) {
 439             pair<multimap<string,const Attribute*>::const_iterator,multimap<string,const Attribute*>::const_iterator> matches =
 440                 attributes.equal_range(*rmid);
 441             while (matches.first != matches.second) {
 442                 const vector<string>& vals = matches.first->second->getSerializedValues();
 443                 if (!vals.empty()) {
 444                     request.setRemoteUser(vals.front().c_str());
 445                     remoteUserSet = true;
 446                     break;
 447                 }
 448             }
 449         }
 450
 451         return make_pair(false,0L);
 452     }
 453     catch (exception& e) {
 454         TemplateParameters tp(&e);
 455         tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 456         return make_pair(true,sendError(log, request, app, "session", tp));
 457     }
 458 }
 459
 460 pair<bool,long> ServiceProvider::doHandler(SPRequest& request) const
 461 {
 462 #ifdef _DEBUG
 463     xmltooling::NDC ndc("doHandler");
 464 #endif
 465     Category& log = Category::getInstance(SHIBSP_LOGCAT".ServiceProvider");
 466
 467     const Application* app=NULL;
 468     string targetURL = request.getRequestURL();
 469
 470     try {
 471         RequestMapper::Settings settings = request.getRequestSettings();
 472         app = &(request.getApplication());
 473
 474         // If not SSL, check to see if we should block or redirect it.
 475         if (!request.isSecure()) {
 476             pair<bool,const char*> redirectToSSL = settings.first->getString("redirectToSSL");
 477             if (redirectToSSL.first) {
 478 #ifdef HAVE_STRCASECMP
 479                 if (!strcasecmp("GET",request.getMethod()) || !strcasecmp("HEAD",request.getMethod())) {
 480 #else
 481                 if (!stricmp("GET",request.getMethod()) || !stricmp("HEAD",request.getMethod())) {
 482 #endif
 483                     // Compute the new target URL
 484                     string redirectURL = string("https://") + request.getHostname();
 485                     if (strcmp(redirectToSSL.second,"443")) {
 486                         redirectURL = redirectURL + ':' + redirectToSSL.second;
 487                     }
 488                     redirectURL += request.getRequestURI();
 489                     return make_pair(true, request.sendRedirect(redirectURL.c_str()));
 490                 }
 491                 else {
 492                     TemplateParameters tp;
 493                     tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 494                     return make_pair(true,sendError(log, request, app, "ssl", tp, false));
 495                 }
 496             }
 497         }
 498
 499         const char* handlerURL=request.getHandlerURL(targetURL.c_str());
 500         if (!handlerURL)
 501             throw ConfigurationException("Cannot determine handler from resource URL, check configuration.");
 502
 503         // Make sure we only process handler requests.
 504         if (!strstr(targetURL.c_str(),handlerURL))
 505             return make_pair(true, request.returnDecline());
 506
 507         const PropertySet* sessionProps=app->getPropertySet("Sessions");
 508         if (!sessionProps)
 509             throw ConfigurationException("Unable to map request to application session settings, check configuration.");
 510
 511         // Process incoming request.
 512         pair<bool,bool> handlerSSL=sessionProps->getBool("handlerSSL");
 513
 514         // Make sure this is SSL, if it should be
 515         if ((!handlerSSL.first || handlerSSL.second) && !request.isSecure())
 516             throw opensaml::FatalProfileException("Blocked non-SSL access to Shibboleth handler.");
 517
 518         // We dispatch based on our path info. We know the request URL begins with or equals the handler URL,
 519         // so the path info is the next character (or null).
 520         const Handler* handler=app->getHandler(targetURL.c_str() + strlen(handlerURL));
 521         if (!handler)
 522             throw ConfigurationException("Shibboleth handler invoked at an unconfigured location.");
 523
 524         pair<bool,long> hret=handler->run(request);
 525
 526         // Did the handler run successfully?
 527         if (hret.first)
 528             return hret;
 529
 530         throw ConfigurationException("Configured Shibboleth handler failed to process the request.");
 531     }
 532     catch (exception& e) {
 533         TemplateParameters tp(&e);
 534         tp.m_map["requestURL"] = targetURL.substr(0,targetURL.find('?'));
 535         tp.m_request = &request;
 536         return make_pair(true,sendError(log, request, app, "session", tp));
 537     }
 538 }