Botan: src/cert/x509store/x509stor.cpp Source File

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x509stor.cpp
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1 /*
2 * X.509 Certificate Store
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Distributed under the terms of the Botan license
6 */
7
8 #include <botan/x509stor.h>
9 #include <botan/parsing.h>
10 #include <botan/pubkey.h>
11 #include <botan/oids.h>
12 #include <botan/time.h>
13 #include <algorithm>
14 #include <memory>
15
16 namespace Botan {
17
18 namespace {
19
20 /*
21 * Do a validity check
22 */
23 s32bit validity_check(const X509_Time& start, const X509_Time& end,
24 u64bit current_time, u32bit slack)
25 {
26 const s32bit NOT_YET_VALID = -1, VALID_TIME = 0, EXPIRED = 1;
27
28 if(start.cmp(current_time + slack) > 0)
29 return NOT_YET_VALID;
30 if(end.cmp(current_time - slack) < 0)
31 return EXPIRED;
32 return VALID_TIME;
33 }
34
35 /*
36 * Compare the value of unique ID fields
37 */
38 bool compare_ids(const MemoryVector<byte>& id1,
39 const MemoryVector<byte>& id2)
40 {
41 if(!id1.size() || !id2.size())
42 return true;
43 return (id1 == id2);
44 }
45
46 /*
47 * Check a particular usage restriction
48 */
49 bool check_usage(const X509_Certificate& cert, X509_Store::Cert_Usage usage,
50 X509_Store::Cert_Usage check_for, Key_Constraints constraints)
51 {
52 if((usage & check_for) == 0)
53 return true;
54 if(cert.constraints() == NO_CONSTRAINTS)
55 return true;
56 if(cert.constraints() & constraints)
57 return true;
58 return false;
59 }
60
61 /*
62 * Check a particular usage restriction
63 */
64 bool check_usage(const X509_Certificate& cert, X509_Store::Cert_Usage usage,
65 X509_Store::Cert_Usage check_for,
66 const std::string& usage_oid)
67 {
68 if((usage & check_for) == 0)
69 return true;
70
71 const std::vector<std::string> constraints = cert.ex_constraints();
72
73 if(constraints.empty())
74 return true;
75
76 return std::binary_search(constraints.begin(), constraints.end(),
77 usage_oid);
78 }
79
80 /*
81 * Check the usage restrictions
82 */
83 X509_Code usage_check(const X509_Certificate& cert,
84 X509_Store::Cert_Usage usage)
85 {
86 if(usage == X509_Store::ANY)
87 return VERIFIED;
88
89 if(!check_usage(cert, usage, X509_Store::CRL_SIGNING, CRL_SIGN))
90 return CA_CERT_NOT_FOR_CRL_ISSUER;
91
92 if(!check_usage(cert, usage, X509_Store::TLS_SERVER, "PKIX.ServerAuth"))
93 return INVALID_USAGE;
94 if(!check_usage(cert, usage, X509_Store::TLS_CLIENT, "PKIX.ClientAuth"))
95 return INVALID_USAGE;
96 if(!check_usage(cert, usage, X509_Store::CODE_SIGNING, "PKIX.CodeSigning"))
97 return INVALID_USAGE;
98 if(!check_usage(cert, usage, X509_Store::EMAIL_PROTECTION,
99 "PKIX.EmailProtection"))
100 return INVALID_USAGE;
101 if(!check_usage(cert, usage, X509_Store::TIME_STAMPING,
102 "PKIX.TimeStamping"))
103 return INVALID_USAGE;
104
105 return VERIFIED;
106 }
107
108 }
109
110 /*
111 * Define equality for revocation data
112 */
113 bool X509_Store::CRL_Data::operator==(const CRL_Data& other) const
114 {
115 if(issuer != other.issuer)
116 return false;
117 if(serial != other.serial)
118 return false;
119 return compare_ids(auth_key_id, other.auth_key_id);
120 }
121
122 /*
123 * Define inequality for revocation data
124 */
125 bool X509_Store::CRL_Data::operator!=(const CRL_Data& other) const
126 {
127 return !((*this) == other);
128 }
129
130 /*
131 * Define an ordering for revocation data
132 */
133 bool X509_Store::CRL_Data::operator<(const X509_Store::CRL_Data& other) const
134 {
135 if(*this == other)
136 return false;
137
138 const MemoryVector<byte>& serial1 = serial;
139 const MemoryVector<byte>& key_id1 = auth_key_id;
140 const MemoryVector<byte>& serial2 = other.serial;
141 const MemoryVector<byte>& key_id2 = other.auth_key_id;
142
143 if(compare_ids(key_id1, key_id2) == false)
144 {
145 if(std::lexicographical_compare(key_id1.begin(), key_id1.end(),
146 key_id2.begin(), key_id2.end()))
147 return true;
148
149 if(std::lexicographical_compare(key_id2.begin(), key_id2.end(),
150 key_id1.begin(), key_id1.end()))
151 return false;
152 }
153
154 if(compare_ids(serial1, serial2) == false)
155 {
156 if(std::lexicographical_compare(serial1.begin(), serial1.end(),
157 serial2.begin(), serial2.end()))
158 return true;
159
160 if(std::lexicographical_compare(serial2.begin(), serial2.end(),
161 serial1.begin(), serial1.end()))
162 return false;
163 }
164
165 return (issuer < other.issuer);
166 }
167
168 /*
169 * X509_Store Constructor
170 */
171 X509_Store::X509_Store(u32bit slack, u32bit cache_timeout)
172 {
173 revoked_info_valid = true;
174
175 validation_cache_timeout = cache_timeout;
176 time_slack = slack;
177 }
178
179 /*
180 * X509_Store Copy Constructor
181 */
182 X509_Store::X509_Store(const X509_Store& other)
183 {
184 certs = other.certs;
185 revoked = other.revoked;
186 revoked_info_valid = other.revoked_info_valid;
187 for(size_t j = 0; j != other.stores.size(); ++j)
188 stores[j] = other.stores[j]->clone();
189 time_slack = other.time_slack;
190 validation_cache_timeout = other.validation_cache_timeout;
191 }
192
193 /*
194 * X509_Store Destructor
195 */
196 X509_Store::~X509_Store()
197 {
198 for(size_t j = 0; j != stores.size(); ++j)
199 delete stores[j];
200 }
201
202 /*
203 * Verify a certificate's authenticity
204 */
205 X509_Code X509_Store::validate_cert(const X509_Certificate& cert,
206 Cert_Usage cert_usage)
207 {
208 recompute_revoked_info();
209
210 std::vector<size_t> indexes;
211 X509_Code chaining_result = construct_cert_chain(cert, indexes);
212 if(chaining_result != VERIFIED)
213 return chaining_result;
214
215 const u64bit current_time = system_time();
216
217 s32bit time_check = validity_check(cert.start_time(), cert.end_time(),
218 current_time, time_slack);
219 if(time_check < 0) return CERT_NOT_YET_VALID;
220 else if(time_check > 0) return CERT_HAS_EXPIRED;
221
222 X509_Code sig_check_result = check_sig(cert, certs[indexes[0]]);
223 if(sig_check_result != VERIFIED)
224 return sig_check_result;
225
226 if(is_revoked(cert))
227 return CERT_IS_REVOKED;
228
229 for(size_t j = 0; j != indexes.size() - 1; ++j)
230 {
231 const X509_Certificate& current_cert = certs[indexes[j]].cert;
232
233 time_check = validity_check(current_cert.start_time(),
234 current_cert.end_time(),
235 current_time,
236 time_slack);
237
238 if(time_check < 0) return CERT_NOT_YET_VALID;
239 else if(time_check > 0) return CERT_HAS_EXPIRED;
240
241 sig_check_result = check_sig(certs[indexes[j]], certs[indexes[j+1]]);
242 if(sig_check_result != VERIFIED)
243 return sig_check_result;
244 }
245
246 return usage_check(cert, cert_usage);
247 }
248
249 /*
250 * Find this certificate
251 */
252 size_t X509_Store::find_cert(const X509_DN& subject_dn,
253 const MemoryRegion<byte>& subject_key_id) const
254 {
255 for(size_t j = 0; j != certs.size(); ++j)
256 {
257 const X509_Certificate& this_cert = certs[j].cert;
258 if(compare_ids(this_cert.subject_key_id(), subject_key_id) &&
259 this_cert.subject_dn() == subject_dn)
260 return j;
261 }
262 return NO_CERT_FOUND;
263 }
264
265 /*
266 * Find the parent of this certificate
267 */
268 size_t X509_Store::find_parent_of(const X509_Certificate& cert)
269 {
270 const X509_DN issuer_dn = cert.issuer_dn();
271 const MemoryVector<byte> auth_key_id = cert.authority_key_id();
272
273 size_t index = find_cert(issuer_dn, auth_key_id);
274
275 if(index != NO_CERT_FOUND)
276 return index;
277
278 for(size_t j = 0; j != stores.size(); ++j)
279 {
280 std::vector<X509_Certificate> got =
281 stores[j]->find_cert_by_subject_and_key_id(issuer_dn, auth_key_id);
282
283 for(size_t k = 0; k != got.size(); ++k)
284 add_cert(got[k]);
285 }
286
287 return find_cert(issuer_dn, auth_key_id);
288 }
289
290 /*
291 * Construct a chain of certificate relationships
292 */
293 X509_Code X509_Store::construct_cert_chain(const X509_Certificate& end_cert,
294 std::vector<size_t>& indexes,
295 bool need_full_chain)
296 {
297 size_t parent = find_parent_of(end_cert);
298
299 while(true)
300 {
301 if(parent == NO_CERT_FOUND)
302 return CERT_ISSUER_NOT_FOUND;
303 indexes.push_back(parent);
304
305 if(certs[parent].is_verified(validation_cache_timeout))
306 if(certs[parent].verify_result() != VERIFIED)
307 return certs[parent].verify_result();
308
309 const X509_Certificate& parent_cert = certs[parent].cert;
310 if(!parent_cert.is_CA_cert())
311 return CA_CERT_NOT_FOR_CERT_ISSUER;
312
313 if(certs[parent].is_trusted())
314 break;
315 if(parent_cert.is_self_signed())
316 return CANNOT_ESTABLISH_TRUST;
317
318 if(parent_cert.path_limit() < indexes.size() - 1)
319 return CERT_CHAIN_TOO_LONG;
320
321 parent = find_parent_of(parent_cert);
322 }
323
324 if(need_full_chain)
325 return VERIFIED;
326
327 while(true)
328 {
329 if(indexes.size() < 2)
330 break;
331
332 const size_t cert = indexes.back();
333
334 if(certs[cert].is_verified(validation_cache_timeout))
335 {
336 if(certs[cert].verify_result() != VERIFIED)
337 throw Internal_Error("X509_Store::construct_cert_chain");
338 indexes.pop_back();
339 }
340 else
341 break;
342 }
343
344 const size_t last_cert = indexes.back();
345 const size_t parent_of_last_cert = find_parent_of(certs[last_cert].cert);
346 if(parent_of_last_cert == NO_CERT_FOUND)
347 return CERT_ISSUER_NOT_FOUND;
348 indexes.push_back(parent_of_last_cert);
349
350 return VERIFIED;
351 }
352
353 /*
354 * Check the CAs signature on a certificate
355 */
356 X509_Code X509_Store::check_sig(const Cert_Info& cert_info,
357 const Cert_Info& ca_cert_info) const
358 {
359 if(cert_info.is_verified(validation_cache_timeout))
360 return cert_info.verify_result();
361
362 const X509_Certificate& cert = cert_info.cert;
363 const X509_Certificate& ca_cert = ca_cert_info.cert;
364
365 X509_Code verify_code = check_sig(cert, ca_cert.subject_public_key());
366
367 cert_info.set_result(verify_code);
368
369 return verify_code;
370 }
371
372 /*
373 * Check a CA's signature
374 */
375 X509_Code X509_Store::check_sig(const X509_Object& object, Public_Key* key)
376 {
377 std::auto_ptr<Public_Key> pub_key(key);
378
379 try {
380 std::vector<std::string> sig_info =
381 split_on(OIDS::lookup(object.signature_algorithm().oid), '/');
382
383 if(sig_info.size() != 2 || sig_info[0] != pub_key->algo_name())
384 return SIGNATURE_ERROR;
385
386 std::string padding = sig_info[1];
387 Signature_Format format;
388 if(key->message_parts() >= 2) format = DER_SEQUENCE;
389 else format = IEEE_1363;
390
391 PK_Verifier verifier(*pub_key.get(), padding, format);
392
393 bool valid = verifier.verify_message(object.tbs_data(),
394 object.signature());
395
396 if(valid)
397 return VERIFIED;
398 else
399 return SIGNATURE_ERROR;
400 }
401 catch(Lookup_Error) { return CA_CERT_CANNOT_SIGN; }
402 catch(Decoding_Error) { return CERT_FORMAT_ERROR; }
403 catch(Exception) {}
404
405 return UNKNOWN_X509_ERROR;
406 }
407
408 /*
409 * Recompute the revocation status of the certs
410 */
411 void X509_Store::recompute_revoked_info() const
412 {
413 if(revoked_info_valid)
414 return;
415
416 for(size_t j = 0; j != certs.size(); ++j)
417 {
418 if((certs[j].is_verified(validation_cache_timeout)) &&
419 (certs[j].verify_result() != VERIFIED))
420 continue;
421
422 if(is_revoked(certs[j].cert))
423 certs[j].set_result(CERT_IS_REVOKED);
424 }
425
426 revoked_info_valid = true;
427 }
428
429 /*
430 * Check if a certificate is revoked
431 */
432 bool X509_Store::is_revoked(const X509_Certificate& cert) const
433 {
434 CRL_Data revoked_info;
435 revoked_info.issuer = cert.issuer_dn();
436 revoked_info.serial = cert.serial_number();
437 revoked_info.auth_key_id = cert.authority_key_id();
438
439 if(std::binary_search(revoked.begin(), revoked.end(), revoked_info))
440 return true;
441 return false;
442 }
443
444 /*
445 * Construct a path back to a root for this cert
446 */
447 std::vector<X509_Certificate>
448 X509_Store::get_cert_chain(const X509_Certificate& cert)
449 {
450 std::vector<X509_Certificate> result;
451 std::vector<size_t> indexes;
452 X509_Code chaining_result = construct_cert_chain(cert, indexes, true);
453
454 if(chaining_result != VERIFIED)
455 throw Invalid_State("X509_Store::get_cert_chain: Can't construct chain");
456
457 for(size_t j = 0; j != indexes.size(); ++j)
458 result.push_back(certs[indexes[j]].cert);
459 return result;
460 }
461
462 /*
463 * Add a certificate store to the list of stores
464 */
465 void X509_Store::add_new_certstore(Certificate_Store* certstore)
466 {
467 stores.push_back(certstore);
468 }
469
470 /*
471 * Add a certificate to the store
472 */
473 void X509_Store::add_cert(const X509_Certificate& cert, bool trusted)
474 {
475 if(trusted && !cert.is_self_signed())
476 throw Invalid_Argument("X509_Store: Trusted certs must be self-signed");
477
478 if(find_cert(cert.subject_dn(), cert.subject_key_id()) == NO_CERT_FOUND)
479 {
480 revoked_info_valid = false;
481 Cert_Info info(cert, trusted);
482 certs.push_back(info);
483 }
484 else if(trusted)
485 {
486 for(size_t j = 0; j != certs.size(); ++j)
487 {
488 const X509_Certificate& this_cert = certs[j].cert;
489 if(this_cert == cert)
490 certs[j].trusted = trusted;
491 }
492 }
493 }
494
495 /*
496 * Add one or more certificates to the store
497 */
498 void X509_Store::do_add_certs(DataSource& source, bool trusted)
499 {
500 while(!source.end_of_data())
501 {
502 try {
503 X509_Certificate cert(source);
504 add_cert(cert, trusted);
505 }
506 catch(Decoding_Error) {}
507 catch(Invalid_Argument) {}
508 }
509 }
510
511 /*
512 * Add one or more certificates to the store
513 */
514 void X509_Store::add_certs(DataSource& source)
515 {
516 do_add_certs(source, false);
517 }
518
519 /*
520 * Add one or more certificates to the store
521 */
522 void X509_Store::add_trusted_certs(DataSource& source)
523 {
524 do_add_certs(source, true);
525 }
526
527 /*
528 * Add one or more certificates to the store
529 */
530 X509_Code X509_Store::add_crl(const X509_CRL& crl)
531 {
532 s32bit time_check = validity_check(crl.this_update(), crl.next_update(),
533 system_time(), time_slack);
534
535 if(time_check < 0) return CRL_NOT_YET_VALID;
536 else if(time_check > 0) return CRL_HAS_EXPIRED;
537
538 size_t cert_index = NO_CERT_FOUND;
539
540 for(size_t j = 0; j != certs.size(); ++j)
541 {
542 const X509_Certificate& this_cert = certs[j].cert;
543 if(compare_ids(this_cert.subject_key_id(), crl.authority_key_id()))
544 {
545 if(this_cert.subject_dn() == crl.issuer_dn())
546 cert_index = j;
547 }
548 }
549
550 if(cert_index == NO_CERT_FOUND)
551 return CRL_ISSUER_NOT_FOUND;
552
553 const X509_Certificate& ca_cert = certs[cert_index].cert;
554
555 X509_Code verify_result = validate_cert(ca_cert, CRL_SIGNING);
556 if(verify_result != VERIFIED)
557 return verify_result;
558
559 verify_result = check_sig(crl, ca_cert.subject_public_key());
560 if(verify_result != VERIFIED)
561 return verify_result;
562
563 std::vector<CRL_Entry> revoked_certs = crl.get_revoked();
564
565 for(size_t j = 0; j != revoked_certs.size(); ++j)
566 {
567 CRL_Data revoked_info;
568 revoked_info.issuer = crl.issuer_dn();
569 revoked_info.serial = revoked_certs[j].serial_number();
570 revoked_info.auth_key_id = crl.authority_key_id();
571
572 std::vector<CRL_Data>::iterator p =
573 std::find(revoked.begin(), revoked.end(), revoked_info);
574
575 if(revoked_certs[j].reason_code() == REMOVE_FROM_CRL)
576 {
577 if(p == revoked.end()) continue;
578 revoked.erase(p);
579 }
580 else
581 {
582 if(p != revoked.end()) continue;
583 revoked.push_back(revoked_info);
584 }
585 }
586
587 std::sort(revoked.begin(), revoked.end());
588 revoked_info_valid = false;
589
590 return VERIFIED;
591 }
592
593 /*
594 * PEM encode the set of certificates
595 */
596 std::string X509_Store::PEM_encode() const
597 {
598 std::string cert_store;
599 for(size_t j = 0; j != certs.size(); ++j)
600 cert_store += certs[j].cert.PEM_encode();
601 return cert_store;
602 }
603
604 /*
605 * Create a Cert_Info structure
606 */
607 X509_Store::Cert_Info::Cert_Info(const X509_Certificate& c,
608 bool t) : cert(c), trusted(t)
609 {
610 checked = false;
611 result = UNKNOWN_X509_ERROR;
612 last_checked = 0;
613 }
614
615 /*
616 * Return the verification results
617 */
618 X509_Code X509_Store::Cert_Info::verify_result() const
619 {
620 if(!checked)
621 throw Invalid_State("Cert_Info::verify_result() called; not checked");
622 return result;
623 }
624
625 /*
626 * Set the verification results
627 */
628 void X509_Store::Cert_Info::set_result(X509_Code code) const
629 {
630 result = code;
631 last_checked = system_time();
632 checked = true;
633 }
634
635 /*
636 * Check if this certificate can be trusted
637 */
638 bool X509_Store::Cert_Info::is_trusted() const
639 {
640 return trusted;
641 }
642
643 /*
644 * Check if this certificate has been verified
645 */
646 bool X509_Store::Cert_Info::is_verified(u32bit timeout) const
647 {
648 if(!checked)
649 return false;
650 if(result != VERIFIED && result != CERT_NOT_YET_VALID)
651 return true;
652
653 const u64bit current_time = system_time();
654
655 if(current_time > last_checked + timeout)
656 checked = false;
657
658 return checked;
659 }
660
661 }
Botan::X509_Store::CRL_SIGNING
Definition: x509stor.h:58
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Definition: x509stor.cpp:596
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