various fixes, add a sample attribute to exercise code
[mech_eap.git] / 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.
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23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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 /*
52  * gss_eap_saml_assertion_provider is for retrieving the underlying
53  * assertion.
54  */
55 gss_eap_saml_assertion_provider::gss_eap_saml_assertion_provider(void)
56 {
57     m_assertion = NULL;
58     m_authenticated = false;
59 }
60
61 gss_eap_saml_assertion_provider::~gss_eap_saml_assertion_provider(void)
62 {
63     delete m_assertion;
64 }
65
66 bool
67 gss_eap_saml_assertion_provider::initFromExistingContext(const gss_eap_attr_ctx *manager,
68                                                          const gss_eap_attr_provider *ctx)
69 {
70     /* Then we may be creating from an existing attribute context */
71     const gss_eap_saml_assertion_provider *saml;
72
73     assert(m_assertion == NULL);
74
75     if (!gss_eap_attr_provider::initFromExistingContext(manager, ctx))
76         return false;
77
78     saml = static_cast<const gss_eap_saml_assertion_provider *>(ctx);
79     setAssertion(saml->getAssertion(), saml->authenticated());
80
81     return true;
82 }
83
84 bool
85 gss_eap_saml_assertion_provider::initFromGssContext(const gss_eap_attr_ctx *manager,
86                                                     const gss_cred_id_t gssCred,
87                                                     const gss_ctx_id_t gssCtx)
88 {
89     const gss_eap_radius_attr_provider *radius;
90     gss_buffer_desc value = GSS_C_EMPTY_BUFFER;
91     int authenticated, complete, more = -1;
92     OM_uint32 minor;
93
94     assert(m_assertion == NULL);
95
96     if (!gss_eap_attr_provider::initFromGssContext(manager, gssCred, gssCtx))
97         return false;
98
99     radius = static_cast<const gss_eap_radius_attr_provider *>
100         (m_manager->getProvider(ATTR_TYPE_RADIUS));
101     if (radius != NULL &&
102         radius->getAttribute(PW_SAML_ASSERTION, &authenticated, &complete,
103                              &value, NULL, &more)) {
104         setAssertion(&value, authenticated);
105         gss_release_buffer(&minor, &value);
106     } else {
107         m_assertion = NULL;
108     }
109
110     return true;
111 }
112
113 void
114 gss_eap_saml_assertion_provider::setAssertion(const saml2::Assertion *assertion,
115                                               bool authenticated)
116 {
117
118     delete m_assertion;
119
120     if (assertion != NULL) {
121         m_assertion = dynamic_cast<saml2::Assertion *>(assertion->clone());
122         m_authenticated = authenticated;
123     } else {
124         m_assertion = NULL;
125         m_authenticated = false;
126     }
127 }
128
129 void
130 gss_eap_saml_assertion_provider::setAssertion(const gss_buffer_t buffer,
131                                               bool authenticated)
132 {
133     delete m_assertion;
134
135     m_assertion = parseAssertion(buffer);
136     m_authenticated = (m_assertion != NULL && authenticated);
137 }
138
139 saml2::Assertion *
140 gss_eap_saml_assertion_provider::parseAssertion(const gss_buffer_t buffer)
141 {
142     string str((char *)buffer->value, buffer->length);
143     istringstream istream(str);
144     DOMDocument *doc;
145     const XMLObjectBuilder *b;
146
147     doc = XMLToolingConfig::getConfig().getParser().parse(istream);
148     b = XMLObjectBuilder::getBuilder(doc->getDocumentElement());
149
150     return dynamic_cast<saml2::Assertion *>(b->buildFromDocument(doc));
151 }
152
153 bool
154 gss_eap_saml_assertion_provider::getAttributeTypes(gss_eap_attr_enumeration_cb addAttribute,
155                                                    void *data) const
156 {
157     bool ret;
158
159     /* just add the prefix */
160     if (m_assertion != NULL)
161         ret = addAttribute(this, GSS_C_NO_BUFFER, data);
162     else
163         ret = true;
164
165     return ret;
166 }
167
168 void
169 gss_eap_saml_assertion_provider::setAttribute(int complete,
170                                               const gss_buffer_t attr,
171                                               const gss_buffer_t value)
172 {
173     if (attr == GSS_C_NO_BUFFER || attr->length == 0) {
174         setAssertion(value);
175     }
176 }
177
178 void
179 gss_eap_saml_assertion_provider::deleteAttribute(const gss_buffer_t value)
180 {
181     delete m_assertion;
182     m_assertion = NULL;
183     m_authenticated = false;
184 }
185
186 time_t
187 gss_eap_saml_assertion_provider::getExpiryTime(void) const
188 {
189     saml2::Conditions *conditions;
190     time_t expiryTime = 0;
191
192     if (m_assertion == NULL)
193         return 0;
194
195     conditions = m_assertion->getConditions();
196
197     if (conditions != NULL && conditions->getNotOnOrAfter() != NULL)
198         expiryTime = conditions->getNotOnOrAfter()->getEpoch();
199
200     return expiryTime;
201 }
202
203 bool
204 gss_eap_saml_assertion_provider::getAttribute(const gss_buffer_t attr,
205                                               int *authenticated,
206                                               int *complete,
207                                               gss_buffer_t value,
208                                               gss_buffer_t display_value,
209                                               int *more) const
210 {
211     string str;
212
213     if (attr != GSS_C_NO_BUFFER || attr->length != 0)
214         return false;
215
216     if (m_assertion == NULL)
217         return false;
218
219     if (*more != -1)
220         return false;
221
222     if (authenticated != NULL)
223         *authenticated = m_authenticated;
224     if (complete != NULL)
225         *complete = true;
226
227     XMLHelper::serialize(m_assertion->marshall((DOMDocument *)NULL), str);
228
229     duplicateBuffer(str, value);
230     *more = 0;
231
232     return true;
233 }
234
235 gss_any_t
236 gss_eap_saml_assertion_provider::mapToAny(int authenticated,
237                                           gss_buffer_t type_id) const
238 {
239     return (gss_any_t)m_assertion;
240 }
241
242 void
243 gss_eap_saml_assertion_provider::releaseAnyNameMapping(gss_buffer_t type_id,
244                                                        gss_any_t input) const
245 {
246     delete ((saml2::Assertion *)input);
247 }
248
249 void
250 gss_eap_saml_assertion_provider::exportToBuffer(gss_buffer_t buffer) const
251 {
252     ostringstream sink;
253     string str;
254
255     buffer->length = 0;
256     buffer->value = NULL;
257
258     if (m_assertion == NULL)
259         return;
260
261     sink << *m_assertion;
262     str = sink.str();
263
264     duplicateBuffer(str, buffer);
265 }
266
267 bool
268 gss_eap_saml_assertion_provider::initFromBuffer(const gss_eap_attr_ctx *ctx,
269                                                 const gss_buffer_t buffer)
270 {
271     if (!gss_eap_attr_provider::initFromBuffer(ctx, buffer))
272         return false;
273
274     if (buffer->length == 0)
275         return true;
276
277     assert(m_assertion == NULL);
278
279     setAssertion(buffer);
280     /* TODO XXX how to propagate authenticated flag? */
281
282     return true;
283 }
284
285 bool
286 gss_eap_saml_assertion_provider::init(void)
287 {
288     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML_ASSERTION,
289                                        "urn:ietf:params:gss-eap:saml-aaa-assertion",
290                                        gss_eap_saml_assertion_provider::createAttrContext);
291     return true;
292 }
293
294 void
295 gss_eap_saml_assertion_provider::finalize(void)
296 {
297     gss_eap_attr_ctx::unregisterProvider(ATTR_TYPE_SAML_ASSERTION);
298 }
299
300 gss_eap_attr_provider *
301 gss_eap_saml_assertion_provider::createAttrContext(void)
302 {
303     return new gss_eap_saml_assertion_provider;
304 }
305
306 /*
307  * gss_eap_saml_attr_provider is for retrieving the underlying attributes.
308  */
309 bool
310 gss_eap_saml_attr_provider::getAssertion(int *authenticated,
311                                          const saml2::Assertion **pAssertion) const
312 {
313     const gss_eap_saml_assertion_provider *saml;
314
315     if (authenticated != NULL)
316         *authenticated = false;
317     if (pAssertion != NULL)
318         *pAssertion = NULL;
319
320     saml = static_cast<const gss_eap_saml_assertion_provider *>
321         (m_manager->getProvider(ATTR_TYPE_SAML_ASSERTION));
322     if (saml == NULL)
323         return false;
324
325     if (authenticated != NULL)
326         *authenticated = saml->authenticated();
327     if (pAssertion != NULL)
328         *pAssertion = saml->getAssertion();
329
330     return (saml->getAssertion() != NULL);
331 }
332
333 bool
334 gss_eap_saml_attr_provider::getAttributeTypes(gss_eap_attr_enumeration_cb addAttribute,
335                                               void *data) const
336 {
337     const saml2::Assertion *assertion;
338     bool ret = true;
339     int authenticated;
340
341     if (!getAssertion(&authenticated, &assertion))
342         return true;
343
344     /*
345      * Note: the first prefix is added by the attribute provider manager
346      *
347      * From draft-hartman-gss-eap-naming-00:
348      *
349      *   Each attribute carried in the assertion SHOULD also be a GSS name
350      *   attribute.  The name of this attribute has three parts, all separated
351      *   by an ASCII space character.  The first part is
352      *   urn:ietf:params:gss-eap:saml-attr.  The second part is the URI for
353      *   the SAML attribute name format.  The final part is the name of the
354      *   SAML attribute.  If the mechanism performs an additional attribute
355      *   query, the retrieved attributes SHOULD be GSS-API name attributes
356      *   using the same name syntax.
357      */
358     const vector<saml2::Attribute*>& attrs2 =
359         const_cast<const saml2::AttributeStatement*>(assertion->getAttributeStatements().front())->getAttributes();
360     for (vector<saml2::Attribute*>::const_iterator a = attrs2.begin();
361         a != attrs2.end();
362         ++a)
363     {
364         const XMLCh *attributeName = (*a)->getName();
365         const XMLCh *attributeNameFormat = (*a)->getNameFormat();
366         XMLCh *qualifiedName;
367         XMLCh space[2] = { ' ', 0 };
368         gss_buffer_desc utf8;
369
370         qualifiedName = new XMLCh[XMLString::stringLen(attributeName) + 1 +
371                                   XMLString::stringLen(attributeNameFormat) + 1];
372         XMLString::copyString(qualifiedName, attributeName);
373         XMLString::catString(qualifiedName, space);
374         XMLString::catString(qualifiedName, attributeNameFormat);
375
376         utf8.value = (void *)toUTF8(qualifiedName);
377         utf8.length = strlen((char *)utf8.value);
378
379         ret = addAttribute(this, &utf8, data);
380
381         delete qualifiedName;
382
383         if (!ret)
384             break;
385     }
386
387     return ret;
388 }
389
390 void
391 gss_eap_saml_attr_provider::setAttribute(int complete,
392                                          const gss_buffer_t attr,
393                                          const gss_buffer_t value)
394 {
395 }
396
397 void
398 gss_eap_saml_attr_provider::deleteAttribute(const gss_buffer_t value)
399 {
400 }
401
402 static BaseRefVectorOf<XMLCh> *
403 decomposeAttributeName(const gss_buffer_t attr)
404 {
405     XMLCh *qualifiedAttr = new XMLCh[attr->length + 1];
406     XMLString::transcode((const char *)attr->value, qualifiedAttr, attr->length);
407
408     BaseRefVectorOf<XMLCh> *components = XMLString::tokenizeString(qualifiedAttr);
409
410     delete qualifiedAttr;
411
412     return components;
413 }
414
415 bool
416 gss_eap_saml_attr_provider::getAttribute(const gss_buffer_t attr,
417                                          int *authenticated,
418                                          int *complete,
419                                          const saml2::Attribute **pAttribute) const
420 {
421     const saml2::Assertion *assertion;
422
423     if (authenticated != NULL)
424         *authenticated = false;
425     if (complete != NULL)
426         *complete = true;
427     *pAttribute = NULL;
428
429     if (!getAssertion(authenticated, &assertion) ||
430         assertion->getAttributeStatements().size() == 0)
431         return false;
432
433     /* Check the attribute name consists of name format | whsp | name */
434     BaseRefVectorOf<XMLCh> *components = decomposeAttributeName(attr);
435     if (components == NULL || components->size() != 2) {
436         delete components;
437         return false;
438     }
439
440     /* For each attribute statement, look for an attribute match */
441     const vector <saml2::AttributeStatement *>&statements =
442         assertion->getAttributeStatements();
443     const saml2::Attribute *ret = NULL;
444
445     for (vector<saml2::AttributeStatement *>::const_iterator s = statements.begin();
446         s != statements.end();
447         ++s) {
448         const vector<saml2::Attribute*>& attrs =
449             const_cast<const saml2::AttributeStatement*>(*s)->getAttributes();
450
451         for (vector<saml2::Attribute*>::const_iterator a = attrs.begin(); a != attrs.end(); ++a) {
452             if (XMLString::equals((*a)->getNameFormat(), components->elementAt(0)) &&
453                 XMLString::equals((*a)->getName(), components->elementAt(1))) {
454                 ret = *a;
455                 break;
456             }
457         }
458
459         if (ret != NULL)
460             break;
461     }
462
463     delete components;
464
465     *pAttribute = ret;
466
467     return (ret != NULL);
468 }
469
470 bool
471 gss_eap_saml_attr_provider::getAttribute(const gss_buffer_t attr,
472                                          int *authenticated,
473                                          int *complete,
474                                          gss_buffer_t value,
475                                          gss_buffer_t display_value,
476                                          int *more) const
477 {
478     const saml2::Attribute *a;
479     const saml2::AttributeValue *av;
480     int nvalues, i = *more;
481
482     *more = 0;
483
484     if (!getAttribute(attr, authenticated, complete, &a))
485         return false;
486
487     nvalues = a->getAttributeValues().size();
488
489     if (i == -1)
490         i = 0;
491     else if (i >= nvalues)
492         return false;
493     av = dynamic_cast<const saml2::AttributeValue *>(a->getAttributeValues().at(i)
494 );
495     if (av != NULL) {
496         if (value != NULL) {
497             value->value = toUTF8(av->getTextContent(), true);
498             value->length = strlen((char *)value->value);
499         }
500         if (display_value != NULL) {
501             display_value->value = toUTF8(av->getTextContent(), true);
502             display_value->length = strlen((char *)value->value);
503         }
504     }
505
506     if (nvalues > ++i)
507         *more = i;
508
509     return true;
510 }
511
512 gss_any_t
513 gss_eap_saml_attr_provider::mapToAny(int authenticated,
514                                      gss_buffer_t type_id) const
515 {
516     return (gss_any_t)NULL;
517 }
518
519 void
520 gss_eap_saml_attr_provider::releaseAnyNameMapping(gss_buffer_t type_id,
521                                                   gss_any_t input) const
522 {
523 }
524
525 void
526 gss_eap_saml_attr_provider::exportToBuffer(gss_buffer_t buffer) const
527 {
528     buffer->length = 0;
529     buffer->value = NULL;
530 }
531
532 bool
533 gss_eap_saml_attr_provider::initFromBuffer(const gss_eap_attr_ctx *ctx,
534                                            const gss_buffer_t buffer)
535 {
536     return gss_eap_attr_provider::initFromBuffer(ctx, buffer);
537 }
538
539 bool
540 gss_eap_saml_attr_provider::init(void)
541 {
542     gss_eap_attr_ctx::registerProvider(ATTR_TYPE_SAML,
543                                        "urn:ietf:params:gss-eap:saml-attr",
544                                        gss_eap_saml_attr_provider::createAttrContext);
545     return true;
546 }
547
548 void
549 gss_eap_saml_attr_provider::finalize(void)
550 {
551     gss_eap_attr_ctx::unregisterProvider(ATTR_TYPE_SAML);
552 }
553
554 gss_eap_attr_provider *
555 gss_eap_saml_attr_provider::createAttrContext(void)
556 {
557     return new gss_eap_saml_attr_provider;
558 }