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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "net/cert/x509_certificate.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/memory/scoped_ptr.h" | |
9 #include "base/pickle.h" | |
10 #include "base/sha1.h" | |
11 #include "base/strings/string_util.h" | |
12 #include "base/strings/utf_string_conversions.h" | |
13 #include "crypto/capi_util.h" | |
14 #include "crypto/scoped_capi_types.h" | |
15 #include "crypto/sha2.h" | |
16 #include "net/base/net_errors.h" | |
17 | |
18 // Implement CalculateChainFingerprint() with our native crypto library. | |
19 #if defined(USE_OPENSSL) | |
20 #include <openssl/sha.h> | |
21 #else | |
22 #include <blapi.h> | |
23 #endif | |
24 | |
25 #pragma comment(lib, "crypt32.lib") | |
26 | |
27 using base::Time; | |
28 | |
29 namespace net { | |
30 | |
31 namespace { | |
32 | |
33 typedef crypto::ScopedCAPIHandle< | |
34 HCERTSTORE, | |
35 crypto::CAPIDestroyerWithFlags<HCERTSTORE, | |
36 CertCloseStore, 0> > ScopedHCERTSTORE; | |
37 | |
38 void ExplodedTimeToSystemTime(const base::Time::Exploded& exploded, | |
39 SYSTEMTIME* system_time) { | |
40 system_time->wYear = static_cast<WORD>(exploded.year); | |
41 system_time->wMonth = static_cast<WORD>(exploded.month); | |
42 system_time->wDayOfWeek = static_cast<WORD>(exploded.day_of_week); | |
43 system_time->wDay = static_cast<WORD>(exploded.day_of_month); | |
44 system_time->wHour = static_cast<WORD>(exploded.hour); | |
45 system_time->wMinute = static_cast<WORD>(exploded.minute); | |
46 system_time->wSecond = static_cast<WORD>(exploded.second); | |
47 system_time->wMilliseconds = static_cast<WORD>(exploded.millisecond); | |
48 } | |
49 | |
50 //----------------------------------------------------------------------------- | |
51 | |
52 // Decodes the cert's subjectAltName extension into a CERT_ALT_NAME_INFO | |
53 // structure and stores it in *output. | |
54 void GetCertSubjectAltName( | |
55 PCCERT_CONTEXT cert, | |
56 scoped_ptr<CERT_ALT_NAME_INFO, base::FreeDeleter>* output) { | |
57 PCERT_EXTENSION extension = CertFindExtension(szOID_SUBJECT_ALT_NAME2, | |
58 cert->pCertInfo->cExtension, | |
59 cert->pCertInfo->rgExtension); | |
60 if (!extension) | |
61 return; | |
62 | |
63 CRYPT_DECODE_PARA decode_para; | |
64 decode_para.cbSize = sizeof(decode_para); | |
65 decode_para.pfnAlloc = crypto::CryptAlloc; | |
66 decode_para.pfnFree = crypto::CryptFree; | |
67 CERT_ALT_NAME_INFO* alt_name_info = NULL; | |
68 DWORD alt_name_info_size = 0; | |
69 BOOL rv; | |
70 rv = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, | |
71 szOID_SUBJECT_ALT_NAME2, | |
72 extension->Value.pbData, | |
73 extension->Value.cbData, | |
74 CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, | |
75 &decode_para, | |
76 &alt_name_info, | |
77 &alt_name_info_size); | |
78 if (rv) | |
79 output->reset(alt_name_info); | |
80 } | |
81 | |
82 void AddCertsFromStore(HCERTSTORE store, | |
83 X509Certificate::OSCertHandles* results) { | |
84 PCCERT_CONTEXT cert = NULL; | |
85 | |
86 while ((cert = CertEnumCertificatesInStore(store, cert)) != NULL) { | |
87 PCCERT_CONTEXT to_add = NULL; | |
88 if (CertAddCertificateContextToStore( | |
89 NULL, // The cert won't be persisted in any cert store. This breaks | |
90 // any association the context currently has to |store|, which | |
91 // allows us, the caller, to safely close |store| without | |
92 // releasing the cert handles. | |
93 cert, | |
94 CERT_STORE_ADD_USE_EXISTING, | |
95 &to_add) && to_add != NULL) { | |
96 // When processing stores generated from PKCS#7/PKCS#12 files, it | |
97 // appears that the order returned is the inverse of the order that it | |
98 // appeared in the file. | |
99 // TODO(rsleevi): Ensure this order is consistent across all Win | |
100 // versions | |
101 results->insert(results->begin(), to_add); | |
102 } | |
103 } | |
104 } | |
105 | |
106 X509Certificate::OSCertHandles ParsePKCS7(const char* data, size_t length) { | |
107 X509Certificate::OSCertHandles results; | |
108 CERT_BLOB data_blob; | |
109 data_blob.cbData = length; | |
110 data_blob.pbData = reinterpret_cast<BYTE*>(const_cast<char*>(data)); | |
111 | |
112 HCERTSTORE out_store = NULL; | |
113 | |
114 DWORD expected_types = CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED | | |
115 CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED | | |
116 CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED; | |
117 | |
118 if (!CryptQueryObject(CERT_QUERY_OBJECT_BLOB, &data_blob, expected_types, | |
119 CERT_QUERY_FORMAT_FLAG_BINARY, 0, NULL, NULL, NULL, | |
120 &out_store, NULL, NULL) || out_store == NULL) { | |
121 return results; | |
122 } | |
123 | |
124 AddCertsFromStore(out_store, &results); | |
125 CertCloseStore(out_store, CERT_CLOSE_STORE_CHECK_FLAG); | |
126 | |
127 return results; | |
128 } | |
129 | |
130 // Given a CERT_NAME_BLOB, returns true if it appears in a given list, | |
131 // formatted as a vector of strings holding DER-encoded X.509 | |
132 // DistinguishedName entries. | |
133 bool IsCertNameBlobInIssuerList( | |
134 CERT_NAME_BLOB* name_blob, | |
135 const std::vector<std::string>& issuer_names) { | |
136 for (std::vector<std::string>::const_iterator it = issuer_names.begin(); | |
137 it != issuer_names.end(); ++it) { | |
138 CERT_NAME_BLOB issuer_blob; | |
139 issuer_blob.pbData = | |
140 reinterpret_cast<BYTE*>(const_cast<char*>(it->data())); | |
141 issuer_blob.cbData = static_cast<DWORD>(it->length()); | |
142 | |
143 BOOL rb = CertCompareCertificateName( | |
144 X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, &issuer_blob, name_blob); | |
145 if (rb) | |
146 return true; | |
147 } | |
148 return false; | |
149 } | |
150 | |
151 } // namespace | |
152 | |
153 void X509Certificate::Initialize() { | |
154 DCHECK(cert_handle_); | |
155 subject_.ParseDistinguishedName(cert_handle_->pCertInfo->Subject.pbData, | |
156 cert_handle_->pCertInfo->Subject.cbData); | |
157 issuer_.ParseDistinguishedName(cert_handle_->pCertInfo->Issuer.pbData, | |
158 cert_handle_->pCertInfo->Issuer.cbData); | |
159 | |
160 valid_start_ = Time::FromFileTime(cert_handle_->pCertInfo->NotBefore); | |
161 valid_expiry_ = Time::FromFileTime(cert_handle_->pCertInfo->NotAfter); | |
162 | |
163 fingerprint_ = CalculateFingerprint(cert_handle_); | |
164 ca_fingerprint_ = CalculateCAFingerprint(intermediate_ca_certs_); | |
165 | |
166 const CRYPT_INTEGER_BLOB* serial = &cert_handle_->pCertInfo->SerialNumber; | |
167 scoped_ptr<uint8[]> serial_bytes(new uint8[serial->cbData]); | |
168 for (unsigned i = 0; i < serial->cbData; i++) | |
169 serial_bytes[i] = serial->pbData[serial->cbData - i - 1]; | |
170 serial_number_ = std::string( | |
171 reinterpret_cast<char*>(serial_bytes.get()), serial->cbData); | |
172 } | |
173 | |
174 void X509Certificate::GetSubjectAltName( | |
175 std::vector<std::string>* dns_names, | |
176 std::vector<std::string>* ip_addrs) const { | |
177 if (dns_names) | |
178 dns_names->clear(); | |
179 if (ip_addrs) | |
180 ip_addrs->clear(); | |
181 | |
182 if (!cert_handle_) | |
183 return; | |
184 | |
185 scoped_ptr<CERT_ALT_NAME_INFO, base::FreeDeleter> alt_name_info; | |
186 GetCertSubjectAltName(cert_handle_, &alt_name_info); | |
187 CERT_ALT_NAME_INFO* alt_name = alt_name_info.get(); | |
188 if (alt_name) { | |
189 int num_entries = alt_name->cAltEntry; | |
190 for (int i = 0; i < num_entries; i++) { | |
191 // dNSName is an ASN.1 IA5String representing a string of ASCII | |
192 // characters, so we can use UTF16ToASCII here. | |
193 const CERT_ALT_NAME_ENTRY& entry = alt_name->rgAltEntry[i]; | |
194 | |
195 if (dns_names && entry.dwAltNameChoice == CERT_ALT_NAME_DNS_NAME) { | |
196 dns_names->push_back(base::UTF16ToASCII(entry.pwszDNSName)); | |
197 } else if (ip_addrs && | |
198 entry.dwAltNameChoice == CERT_ALT_NAME_IP_ADDRESS) { | |
199 ip_addrs->push_back(std::string( | |
200 reinterpret_cast<const char*>(entry.IPAddress.pbData), | |
201 entry.IPAddress.cbData)); | |
202 } | |
203 } | |
204 } | |
205 } | |
206 | |
207 PCCERT_CONTEXT X509Certificate::CreateOSCertChainForCert() const { | |
208 // Create an in-memory certificate store to hold this certificate and | |
209 // any intermediate certificates in |intermediate_ca_certs_|. The store | |
210 // will be referenced in the returned PCCERT_CONTEXT, and will not be freed | |
211 // until the PCCERT_CONTEXT is freed. | |
212 ScopedHCERTSTORE store(CertOpenStore( | |
213 CERT_STORE_PROV_MEMORY, 0, NULL, | |
214 CERT_STORE_DEFER_CLOSE_UNTIL_LAST_FREE_FLAG, NULL)); | |
215 if (!store.get()) | |
216 return NULL; | |
217 | |
218 // NOTE: This preserves all of the properties of |os_cert_handle()| except | |
219 // for CERT_KEY_PROV_HANDLE_PROP_ID and CERT_KEY_CONTEXT_PROP_ID - the two | |
220 // properties that hold access to already-opened private keys. If a handle | |
221 // has already been unlocked (eg: PIN prompt), then the first time that the | |
222 // identity is used for client auth, it may prompt the user again. | |
223 PCCERT_CONTEXT primary_cert; | |
224 BOOL ok = CertAddCertificateContextToStore(store.get(), os_cert_handle(), | |
225 CERT_STORE_ADD_ALWAYS, | |
226 &primary_cert); | |
227 if (!ok || !primary_cert) | |
228 return NULL; | |
229 | |
230 for (size_t i = 0; i < intermediate_ca_certs_.size(); ++i) { | |
231 CertAddCertificateContextToStore(store.get(), intermediate_ca_certs_[i], | |
232 CERT_STORE_ADD_ALWAYS, NULL); | |
233 } | |
234 | |
235 // Note: |store| is explicitly not released, as the call to CertCloseStore() | |
236 // when |store| goes out of scope will not actually free the store. Instead, | |
237 // the store will be freed when |primary_cert| is freed. | |
238 return primary_cert; | |
239 } | |
240 | |
241 // static | |
242 bool X509Certificate::GetDEREncoded(X509Certificate::OSCertHandle cert_handle, | |
243 std::string* encoded) { | |
244 if (!cert_handle || !cert_handle->pbCertEncoded || | |
245 !cert_handle->cbCertEncoded) { | |
246 return false; | |
247 } | |
248 encoded->assign(reinterpret_cast<char*>(cert_handle->pbCertEncoded), | |
249 cert_handle->cbCertEncoded); | |
250 return true; | |
251 } | |
252 | |
253 // static | |
254 bool X509Certificate::IsSameOSCert(X509Certificate::OSCertHandle a, | |
255 X509Certificate::OSCertHandle b) { | |
256 DCHECK(a && b); | |
257 if (a == b) | |
258 return true; | |
259 return a->cbCertEncoded == b->cbCertEncoded && | |
260 memcmp(a->pbCertEncoded, b->pbCertEncoded, a->cbCertEncoded) == 0; | |
261 } | |
262 | |
263 // static | |
264 X509Certificate::OSCertHandle X509Certificate::CreateOSCertHandleFromBytes( | |
265 const char* data, int length) { | |
266 OSCertHandle cert_handle = NULL; | |
267 if (!CertAddEncodedCertificateToStore( | |
268 NULL, X509_ASN_ENCODING, reinterpret_cast<const BYTE*>(data), | |
269 length, CERT_STORE_ADD_USE_EXISTING, &cert_handle)) | |
270 return NULL; | |
271 | |
272 return cert_handle; | |
273 } | |
274 | |
275 X509Certificate::OSCertHandles X509Certificate::CreateOSCertHandlesFromBytes( | |
276 const char* data, int length, Format format) { | |
277 OSCertHandles results; | |
278 switch (format) { | |
279 case FORMAT_SINGLE_CERTIFICATE: { | |
280 OSCertHandle handle = CreateOSCertHandleFromBytes(data, length); | |
281 if (handle != NULL) | |
282 results.push_back(handle); | |
283 break; | |
284 } | |
285 case FORMAT_PKCS7: | |
286 results = ParsePKCS7(data, length); | |
287 break; | |
288 default: | |
289 NOTREACHED() << "Certificate format " << format << " unimplemented"; | |
290 break; | |
291 } | |
292 | |
293 return results; | |
294 } | |
295 | |
296 // static | |
297 X509Certificate::OSCertHandle X509Certificate::DupOSCertHandle( | |
298 OSCertHandle cert_handle) { | |
299 return CertDuplicateCertificateContext(cert_handle); | |
300 } | |
301 | |
302 // static | |
303 void X509Certificate::FreeOSCertHandle(OSCertHandle cert_handle) { | |
304 CertFreeCertificateContext(cert_handle); | |
305 } | |
306 | |
307 // static | |
308 SHA1HashValue X509Certificate::CalculateFingerprint( | |
309 OSCertHandle cert) { | |
310 DCHECK(NULL != cert->pbCertEncoded); | |
311 DCHECK_NE(static_cast<DWORD>(0), cert->cbCertEncoded); | |
312 | |
313 BOOL rv; | |
314 SHA1HashValue sha1; | |
315 DWORD sha1_size = sizeof(sha1.data); | |
316 rv = CryptHashCertificate(NULL, CALG_SHA1, 0, cert->pbCertEncoded, | |
317 cert->cbCertEncoded, sha1.data, &sha1_size); | |
318 DCHECK(rv && sha1_size == sizeof(sha1.data)); | |
319 if (!rv) | |
320 memset(sha1.data, 0, sizeof(sha1.data)); | |
321 return sha1; | |
322 } | |
323 | |
324 // static | |
325 SHA256HashValue X509Certificate::CalculateFingerprint256(OSCertHandle cert) { | |
326 DCHECK(NULL != cert->pbCertEncoded); | |
327 DCHECK_NE(0u, cert->cbCertEncoded); | |
328 | |
329 SHA256HashValue sha256; | |
330 size_t sha256_size = sizeof(sha256.data); | |
331 | |
332 // Use crypto::SHA256HashString for two reasons: | |
333 // * < Windows Vista does not have universal SHA-256 support. | |
334 // * More efficient on Windows > Vista (less overhead since non-default CSP | |
335 // is not needed). | |
336 base::StringPiece der_cert(reinterpret_cast<const char*>(cert->pbCertEncoded), | |
337 cert->cbCertEncoded); | |
338 crypto::SHA256HashString(der_cert, sha256.data, sha256_size); | |
339 return sha256; | |
340 } | |
341 | |
342 SHA1HashValue X509Certificate::CalculateCAFingerprint( | |
343 const OSCertHandles& intermediates) { | |
344 SHA1HashValue sha1; | |
345 memset(sha1.data, 0, sizeof(sha1.data)); | |
346 | |
347 #if defined(USE_OPENSSL) | |
348 SHA_CTX ctx; | |
349 if (!SHA1_Init(&ctx)) | |
350 return sha1; | |
351 for (size_t i = 0; i < intermediates.size(); ++i) { | |
352 PCCERT_CONTEXT ca_cert = intermediates[i]; | |
353 if (!SHA1_Update(&ctx, ca_cert->pbCertEncoded, ca_cert->cbCertEncoded)) | |
354 return sha1; | |
355 } | |
356 SHA1_Final(sha1.data, &ctx); | |
357 #else // !USE_OPENSSL | |
358 SHA1Context* sha1_ctx = SHA1_NewContext(); | |
359 if (!sha1_ctx) | |
360 return sha1; | |
361 SHA1_Begin(sha1_ctx); | |
362 for (size_t i = 0; i < intermediates.size(); ++i) { | |
363 PCCERT_CONTEXT ca_cert = intermediates[i]; | |
364 SHA1_Update(sha1_ctx, ca_cert->pbCertEncoded, ca_cert->cbCertEncoded); | |
365 } | |
366 unsigned int result_len; | |
367 SHA1_End(sha1_ctx, sha1.data, &result_len, SHA1_LENGTH); | |
368 SHA1_DestroyContext(sha1_ctx, PR_TRUE); | |
369 #endif // USE_OPENSSL | |
370 | |
371 return sha1; | |
372 } | |
373 | |
374 // static | |
375 X509Certificate::OSCertHandle | |
376 X509Certificate::ReadOSCertHandleFromPickle(PickleIterator* pickle_iter) { | |
377 const char* data; | |
378 int length; | |
379 if (!pickle_iter->ReadData(&data, &length)) | |
380 return NULL; | |
381 | |
382 // Legacy serialized certificates were serialized with extended attributes, | |
383 // rather than as DER only. As a result, these serialized certificates are | |
384 // not portable across platforms and may have side-effects on Windows due | |
385 // to extended attributes being serialized/deserialized - | |
386 // http://crbug.com/118706. To avoid deserializing these attributes, write | |
387 // the deserialized cert into a temporary cert store and then create a new | |
388 // cert from the DER - that is, without attributes. | |
389 ScopedHCERTSTORE store( | |
390 CertOpenStore(CERT_STORE_PROV_MEMORY, 0, NULL, 0, NULL)); | |
391 if (!store.get()) | |
392 return NULL; | |
393 | |
394 OSCertHandle cert_handle = NULL; | |
395 if (!CertAddSerializedElementToStore( | |
396 store.get(), reinterpret_cast<const BYTE*>(data), length, | |
397 CERT_STORE_ADD_NEW, 0, CERT_STORE_CERTIFICATE_CONTEXT_FLAG, | |
398 NULL, reinterpret_cast<const void **>(&cert_handle))) { | |
399 return NULL; | |
400 } | |
401 | |
402 std::string encoded; | |
403 bool ok = GetDEREncoded(cert_handle, &encoded); | |
404 FreeOSCertHandle(cert_handle); | |
405 cert_handle = NULL; | |
406 | |
407 if (ok) | |
408 cert_handle = CreateOSCertHandleFromBytes(encoded.data(), encoded.size()); | |
409 return cert_handle; | |
410 } | |
411 | |
412 // static | |
413 bool X509Certificate::WriteOSCertHandleToPickle(OSCertHandle cert_handle, | |
414 Pickle* pickle) { | |
415 return pickle->WriteData( | |
416 reinterpret_cast<char*>(cert_handle->pbCertEncoded), | |
417 cert_handle->cbCertEncoded); | |
418 } | |
419 | |
420 // static | |
421 void X509Certificate::GetPublicKeyInfo(OSCertHandle cert_handle, | |
422 size_t* size_bits, | |
423 PublicKeyType* type) { | |
424 *type = kPublicKeyTypeUnknown; | |
425 *size_bits = 0; | |
426 | |
427 PCCRYPT_OID_INFO oid_info = CryptFindOIDInfo( | |
428 CRYPT_OID_INFO_OID_KEY, | |
429 cert_handle->pCertInfo->SubjectPublicKeyInfo.Algorithm.pszObjId, | |
430 CRYPT_PUBKEY_ALG_OID_GROUP_ID); | |
431 if (!oid_info) | |
432 return; | |
433 | |
434 CHECK_EQ(oid_info->dwGroupId, | |
435 static_cast<DWORD>(CRYPT_PUBKEY_ALG_OID_GROUP_ID)); | |
436 | |
437 *size_bits = CertGetPublicKeyLength( | |
438 X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, | |
439 &cert_handle->pCertInfo->SubjectPublicKeyInfo); | |
440 | |
441 if (IS_SPECIAL_OID_INFO_ALGID(oid_info->Algid)) { | |
442 // For an EC public key, oid_info->Algid is CALG_OID_INFO_PARAMETERS | |
443 // (0xFFFFFFFE). Need to handle it as a special case. | |
444 if (strcmp(oid_info->pszOID, szOID_ECC_PUBLIC_KEY) == 0) { | |
445 *type = kPublicKeyTypeECDSA; | |
446 } else { | |
447 NOTREACHED(); | |
448 } | |
449 return; | |
450 } | |
451 switch (oid_info->Algid) { | |
452 case CALG_RSA_SIGN: | |
453 case CALG_RSA_KEYX: | |
454 *type = kPublicKeyTypeRSA; | |
455 break; | |
456 case CALG_DSS_SIGN: | |
457 *type = kPublicKeyTypeDSA; | |
458 break; | |
459 case CALG_ECDSA: | |
460 *type = kPublicKeyTypeECDSA; | |
461 break; | |
462 case CALG_ECDH: | |
463 *type = kPublicKeyTypeECDH; | |
464 break; | |
465 } | |
466 } | |
467 | |
468 bool X509Certificate::IsIssuedByEncoded( | |
469 const std::vector<std::string>& valid_issuers) { | |
470 | |
471 // If the certificate's issuer in the list? | |
472 if (IsCertNameBlobInIssuerList(&cert_handle_->pCertInfo->Issuer, | |
473 valid_issuers)) { | |
474 return true; | |
475 } | |
476 // Otherwise, is any of the intermediate CA subjects in the list? | |
477 for (OSCertHandles::iterator it = intermediate_ca_certs_.begin(); | |
478 it != intermediate_ca_certs_.end(); ++it) { | |
479 if (IsCertNameBlobInIssuerList(&(*it)->pCertInfo->Issuer, | |
480 valid_issuers)) { | |
481 return true; | |
482 } | |
483 } | |
484 | |
485 return false; | |
486 } | |
487 | |
488 // static | |
489 bool X509Certificate::IsSelfSigned(OSCertHandle cert_handle) { | |
490 return !!CryptVerifyCertificateSignatureEx( | |
491 NULL, | |
492 X509_ASN_ENCODING, | |
493 CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT, | |
494 reinterpret_cast<void*>(const_cast<PCERT_CONTEXT>(cert_handle)), | |
495 CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT, | |
496 reinterpret_cast<void*>(const_cast<PCERT_CONTEXT>(cert_handle)), | |
497 0, | |
498 NULL); | |
499 } | |
500 | |
501 } // namespace net | |
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