mech_eap/util_saml.cpp

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 #include <sstream>
  36
  37 #include <xercesc/util/XMLUniDefs.hpp>
  38 #include <xmltooling/XMLToolingConfig.h>
  39 #include <xmltooling/util/XMLHelper.h>
  40
  41 #include <saml/saml1/core/Assertions.h>
  42 #include <saml/saml2/core/Assertions.h>
  43 #include <saml/saml2/metadata/Metadata.h>
  44
  45 using namespace xmltooling;
  46 using namespace opensaml::saml2md;
  47 using namespace opensaml;
  48 using namespace xercesc;
  49 using namespace std;
  50
  51 class auto_ptr_gss_buffer {
  52     MAKE_NONCOPYABLE(auto_ptr_gss_buffer);
  53     public:
  54         auto_ptr_gss_buffer() : m_buf(NULL) {
  55         }
  56         auto_ptr_gss_buffer(const gss_buffer_t src) {
  57             m_buf = new XMLCh[src->length + 1];
  58             XMLString::transcode((const char *)src->value, m_buf, src->length);
  59         }
  60         ~auto_ptr_gss_buffer() {
  61             xercesc::XMLString::release(&m_buf);
  62         }
  63         const XMLCh* get() const {
  64             return m_buf;
  65         }
  66         XMLCh* release() {
  67             XMLCh *temp = m_buf; m_buf = NULL; return temp;
  68         }
  69     private:
  70         XMLCh *m_buf;
  71 };
  72
  73 /*
  74  * gss_eap_saml_assertion_provider is for retrieving the underlying
  75  * assertion.
  76  */
  77 bool
  78 gss_eap_saml_assertion_provider::initFromExistingContext(const gss_eap_attr_ctx *manager,
  79                                                          const gss_eap_attr_provider *ctx)
  80 {
  81     /* Then we may be creating from an existing attribute context */
  82     const gss_eap_saml_assertion_provider *saml;
  83
  84     assert(m_assertion == NULL);
  85
  86     if (!gss_eap_attr_provider::initFromExistingContext(manager, ctx))
  87         return false;
  88
  89     saml = static_cast<const gss_eap_saml_assertion_provider *>(ctx);
  90     setAssertion(saml->getAssertion());
  91
  92     return true;
  93 }
  94
  95 bool
  96 gss_eap_saml_assertion_provider::initFromGssContext(const gss_eap_attr_ctx *manager,
  97                                                     const gss_cred_id_t gssCred,
  98                                                     const gss_ctx_id_t gssCtx)
  99 {
 100     const gss_eap_radius_attr_provider *radius;
 101     gss_buffer_desc value = GSS_C_EMPTY_BUFFER;
 102     int authenticated, complete, more = -1;
 103     OM_uint32 minor;
 104
 105     assert(m_assertion == NULL);
 106
 107     if (!gss_eap_attr_provider::initFromGssContext(manager, gssCred, gssCtx))
 108         return false;
 109
 110     radius = static_cast<const gss_eap_radius_attr_provider *>
 111         (m_manager->getProvider(ATTR_TYPE_RADIUS));
 112     if (radius != NULL &&
 113         radius->getAttribute(512 /* XXX */, &authenticated, &complete,
 114                              &value, NULL, &more)) {
 115         m_assertion = parseAssertion(&value);
 116         gss_release_buffer(&minor, &value);
 117     } else {
 118         m_assertion = NULL;
 119     }
 120
 121     return true;
 122 }
 123
 124 gss_eap_saml_assertion_provider::~gss_eap_saml_assertion_provider(void)
 125 {
 126     delete m_assertion;
 127 }
 128
 129 void
 130 gss_eap_saml_assertion_provider::setAssertion(const saml2::Assertion *assertion)
 131 {
 132
 133     delete m_assertion;
 134
 135     if (assertion != NULL)
 136         m_assertion = dynamic_cast<saml2::Assertion*>(assertion->clone());
 137     else
 138         m_assertion = NULL;
 139 }
 140
 141 saml2::Assertion *
 142 gss_eap_saml_assertion_provider::parseAssertion(const gss_buffer_t buffer)
 143 {
 144     string str((char *)buffer->value, buffer->length);
 145     istringstream istream(str);
 146     DOMDocument *doc;
 147     const XMLObjectBuilder *b;
 148
 149     doc = XMLToolingConfig::getConfig().getParser().parse(istream);
 150     b = XMLObjectBuilder::getBuilder(doc->getDocumentElement());
 151
 152     return dynamic_cast<saml2::Assertion *>(b->buildFromDocument(doc));
 153 }
 154
 155 bool
 156 gss_eap_saml_assertion_provider::getAttributeTypes(gss_eap_attr_enumeration_cb addAttribute,
 157                                                    void *data) const
 158 {
 159     /* just add the prefix */
 160     return addAttribute(this, GSS_C_NO_BUFFER, data);
 161 }
 162
 163 void
 164 gss_eap_saml_assertion_provider::setAttribute(int complete,
 165                                               const gss_buffer_t attr,
 166                                               const gss_buffer_t value)
 167 {
 168     if (attr == GSS_C_NO_BUFFER || attr->length == 0) {
 169         saml2::Assertion *assertion = parseAssertion(value);
 170
 171         delete m_assertion;
 172         m_assertion = assertion;
 173     }
 174 }
 175
 176 void
 177 gss_eap_saml_assertion_provider::deleteAttribute(const gss_buffer_t value)
 178 {
 179     delete m_assertion;
 180     m_assertion = NULL;
 181 }
 182
 183 bool
 184 gss_eap_saml_assertion_provider::getAttribute(const gss_buffer_t attr,
 185                                               int *authenticated,
 186                                               int *complete,
 187                                               gss_buffer_t value,
 188                                               gss_buffer_t display_value,
 189                                               int *more) const
 190 {
 191     string str;
 192
 193     if (attr != GSS_C_NO_BUFFER || attr->length != 0)
 194         return false;
 195
 196     if (m_assertion == NULL)
 197         return false;
 198
 199     if (*more != -1)
 200         return false;
 201
 202     *authenticated = true;
 203     *complete = false;
 204
 205     XMLHelper::serialize(m_assertion->marshall((DOMDocument *)NULL), str);
 206
 207     duplicateBuffer(str, value);
 208     *more = 0;
 209
 210     return true;
 211 }
 212
 213 gss_any_t
 214 gss_eap_saml_assertion_provider::mapToAny(int authenticated,
 215                                           gss_buffer_t type_id) const
 216 {
 217     return (gss_any_t)m_assertion;
 218 }
 219
 220 void
 221 gss_eap_saml_assertion_provider::releaseAnyNameMapping(gss_buffer_t type_id,
 222                                                        gss_any_t input) const
 223 {
 224     delete ((saml2::Assertion *)input);
 225 }
 226
 227 void
 228 gss_eap_saml_assertion_provider::exportToBuffer(gss_buffer_t buffer) const
 229 {
 230     ostringstream sink;
 231     string str;
 232
 233     buffer->length = 0;
 234     buffer->value = NULL;
 235
 236     if (m_assertion == NULL)
 237         return;
 238
 239     sink << *m_assertion;
 240     str = sink.str();
 241
 242     duplicateBuffer(str, buffer);
 243 }
 244
 245 bool
 246 gss_eap_saml_assertion_provider::initFromBuffer(const gss_eap_attr_ctx *ctx,
 247                                                 const gss_buffer_t buffer)
 248 {
 249     if (!gss_eap_attr_provider::initFromBuffer(ctx, buffer))
 250         return false;
 251
 252     assert(m_assertion == NULL);
 253
 254     if (buffer->length == 0)
 255         return true;
 256
 257     m_assertion = parseAssertion(buffer);
 258     return (m_assertion != NULL);
 259 }
 260
 261 bool
 262 gss_eap_saml_assertion_provider::init(void)
 263 {
 264     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML_ASSERTION,
 265                                        gss_eap_saml_assertion_provider::createAttrContext);
 266     return true;
 267 }
 268
 269 void
 270 gss_eap_saml_assertion_provider::finalize(void)
 271 {
 272     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML_ASSERTION, NULL);
 273 }
 274
 275 gss_eap_attr_provider *
 276 gss_eap_saml_assertion_provider::createAttrContext(void)
 277 {
 278     return new gss_eap_saml_assertion_provider;
 279 }
 280
 281 /*
 282  * gss_eap_saml_attr_provider is for retrieving the underlying attributes.
 283  */
 284 const saml2::Assertion *
 285 gss_eap_saml_attr_provider::getAssertion(void) const
 286 {
 287     const gss_eap_saml_assertion_provider *saml;
 288
 289     saml = static_cast<const gss_eap_saml_assertion_provider *>
 290         (m_manager->getProvider(ATTR_TYPE_SAML_ASSERTION));
 291     if (saml != NULL)
 292         return saml->getAssertion();
 293
 294     return NULL;
 295 }
 296
 297 gss_eap_saml_attr_provider::~gss_eap_saml_attr_provider(void)
 298 {
 299     /* Nothing to do, we're just a wrapper around the assertion provider. */
 300 }
 301
 302 bool
 303 gss_eap_saml_attr_provider::getAttributeTypes(gss_eap_attr_enumeration_cb addAttribute,
 304                                               void *data) const
 305 {
 306     const saml2::Assertion *assertion = getAssertion();
 307
 308     if (assertion == NULL)
 309         return true;
 310
 311     const vector<saml2::Attribute*>& attrs2 =
 312         const_cast<const saml2::AttributeStatement*>(assertion->getAttributeStatements().front())->getAttributes();
 313     for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
 314         a != attrs2.end();
 315         ++a)
 316     {
 317         gss_buffer_desc attribute;
 318
 319         attribute.value = (void *)toUTF8((*a)->getName(), true);
 320         attribute.length = strlen((char *)attribute.value);
 321
 322         if (!addAttribute(this, &attribute, data))
 323             return false;
 324
 325         delete (char *)attribute.value;
 326     }
 327
 328     return true;
 329 }
 330
 331 void
 332 gss_eap_saml_attr_provider::setAttribute(int complete,
 333                                          const gss_buffer_t attr,
 334                                          const gss_buffer_t value)
 335 {
 336 }
 337
 338 void
 339 gss_eap_saml_attr_provider::deleteAttribute(const gss_buffer_t value)
 340 {
 341 }
 342
 343 const saml2::Attribute *
 344 gss_eap_saml_attr_provider::getAttribute(const gss_buffer_t attr) const
 345 {
 346     const saml2::Assertion *assertion = getAssertion();
 347     saml2::AttributeStatement *statement;
 348
 349     if (assertion == NULL)
 350         return NULL;
 351
 352     if (assertion->getAttributeStatements().size() == 0)
 353         return NULL;
 354
 355     statement = assertion->getAttributeStatements().front();
 356
 357     auto_ptr_gss_buffer attrname(attr);
 358
 359     const vector<saml2::Attribute*>& attrs2 =
 360         const_cast<const saml2::AttributeStatement*>(statement)->getAttributes();
 361
 362     for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
 363         a != attrs2.end();
 364         ++a) {
 365         if (XMLString::equals((*a)->getName(), attrname.get()))
 366             return *a;
 367     }
 368
 369     return NULL;
 370 }
 371
 372 bool
 373 gss_eap_saml_attr_provider::getAttribute(const gss_buffer_t attr,
 374                                          int *authenticated,
 375                                          int *complete,
 376                                          gss_buffer_t value,
 377                                          gss_buffer_t display_value,
 378                                          int *more) const
 379 {
 380     const saml2::Attribute *a;
 381     const saml2::AttributeValue *av;
 382     int nvalues, i = *more;
 383
 384     *more = 0;
 385
 386     a = getAttribute(attr);
 387     if (a == NULL)
 388         return false;
 389
 390     nvalues = a->getAttributeValues().size();
 391
 392     if (i == -1)
 393         i = 0;
 394     else if (i >= nvalues)
 395         return false;
 396     av = dynamic_cast<const saml2::AttributeValue *>(a->getAttributeValues().at(i)
 397 );
 398     if (av == NULL)
 399         return false;
 400
 401     *authenticated = TRUE;
 402     *complete = FALSE;
 403
 404     value->value = toUTF8(av->getTextContent(), true);
 405     value->length = strlen((char *)value->value);
 406
 407     if (nvalues > ++i)
 408         *more = i;
 409
 410     return true;
 411 }
 412
 413 gss_any_t
 414 gss_eap_saml_attr_provider::mapToAny(int authenticated,
 415                                      gss_buffer_t type_id) const
 416 {
 417     return (gss_any_t)NULL;
 418 }
 419
 420 void
 421 gss_eap_saml_attr_provider::releaseAnyNameMapping(gss_buffer_t type_id,
 422                                                   gss_any_t input) const
 423 {
 424 }
 425
 426 void
 427 gss_eap_saml_attr_provider::exportToBuffer(gss_buffer_t buffer) const
 428 {
 429     buffer->length = 0;
 430     buffer->value = NULL;
 431 }
 432
 433 bool
 434 gss_eap_saml_attr_provider::initFromBuffer(const gss_eap_attr_ctx *ctx,
 435                                            const gss_buffer_t buffer)
 436 {
 437     return true;
 438 }
 439
 440 bool
 441 gss_eap_saml_attr_provider::init(void)
 442 {
 443     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML,
 444                                          gss_eap_saml_attr_provider::createAttrContext);
 445     return true;
 446 }
 447
 448 void
 449 gss_eap_saml_attr_provider::finalize(void)
 450 {
 451     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML, NULL);
 452 }
 453
 454 gss_eap_attr_provider *
 455 gss_eap_saml_attr_provider::createAttrContext(void)
 456 {
 457     return new gss_eap_saml_attr_provider;
 458 }