1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Marc Hoersken, <info@marc-hoersken.de>
9 * Copyright (C) Mark Salisbury, <mark.salisbury@hp.com>
10 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 * SPDX-License-Identifier: curl
24 *
25 ***************************************************************************/
26
27 /*
28 * Source file for Schannel-specific certificate verification. This code should
29 * only be invoked by code in schannel.c.
30 */
31
32 #include "curl_setup.h"
33
34 #ifdef USE_SCHANNEL
35 #ifndef USE_WINDOWS_SSPI
36 # error "Can't compile SCHANNEL support without SSPI."
37 #endif
38
39 #include "schannel.h"
40 #include "schannel_int.h"
41
42 #include "vtls.h"
43 #include "vtls_int.h"
44 #include "sendf.h"
45 #include "strerror.h"
46 #include "curl_multibyte.h"
47 #include "curl_printf.h"
48 #include "hostcheck.h"
49 #include "version_win32.h"
50
51 /* The last #include file should be: */
52 #include "curl_memory.h"
53 #include "memdebug.h"
54
55 #define BACKEND ((struct schannel_ssl_backend_data *)connssl->backend)
56
57
58 #ifdef HAS_MANUAL_VERIFY_API
59
60 #define MAX_CAFILE_SIZE 1048576 /* 1 MiB */
61 #define BEGIN_CERT "-----BEGIN CERTIFICATE-----"
62 #define END_CERT "\n-----END CERTIFICATE-----"
63
64 struct cert_chain_engine_config_win7 {
65 DWORD cbSize;
66 HCERTSTORE hRestrictedRoot;
67 HCERTSTORE hRestrictedTrust;
68 HCERTSTORE hRestrictedOther;
69 DWORD cAdditionalStore;
70 HCERTSTORE *rghAdditionalStore;
71 DWORD dwFlags;
72 DWORD dwUrlRetrievalTimeout;
73 DWORD MaximumCachedCertificates;
74 DWORD CycleDetectionModulus;
75 HCERTSTORE hExclusiveRoot;
76 HCERTSTORE hExclusiveTrustedPeople;
77 };
78
is_cr_or_lf(char c)79 static int is_cr_or_lf(char c)
80 {
81 return c == '\r' || c == '\n';
82 }
83
84 /* Search the substring needle,needlelen into string haystack,haystacklen
85 * Strings don't need to be terminated by a '\0'.
86 * Similar of OSX/Linux memmem (not available on Visual Studio).
87 * Return position of beginning of first occurrence or NULL if not found
88 */
c_memmem(const void * haystack,size_t haystacklen,const void * needle,size_t needlelen)89 static const char *c_memmem(const void *haystack, size_t haystacklen,
90 const void *needle, size_t needlelen)
91 {
92 const char *p;
93 char first;
94 const char *str_limit = (const char *)haystack + haystacklen;
95 if(!needlelen || needlelen > haystacklen)
96 return NULL;
97 first = *(const char *)needle;
98 for(p = (const char *)haystack; p <= (str_limit - needlelen); p++)
99 if(((*p) == first) && (memcmp(p, needle, needlelen) == 0))
100 return p;
101
102 return NULL;
103 }
104
add_certs_data_to_store(HCERTSTORE trust_store,const char * ca_buffer,size_t ca_buffer_size,const char * ca_file_text,struct Curl_easy * data)105 static CURLcode add_certs_data_to_store(HCERTSTORE trust_store,
106 const char *ca_buffer,
107 size_t ca_buffer_size,
108 const char *ca_file_text,
109 struct Curl_easy *data)
110 {
111 const size_t begin_cert_len = strlen(BEGIN_CERT);
112 const size_t end_cert_len = strlen(END_CERT);
113 CURLcode result = CURLE_OK;
114 int num_certs = 0;
115 bool more_certs = 1;
116 const char *current_ca_file_ptr = ca_buffer;
117 const char *ca_buffer_limit = ca_buffer + ca_buffer_size;
118
119 while(more_certs && (current_ca_file_ptr<ca_buffer_limit)) {
120 const char *begin_cert_ptr = c_memmem(current_ca_file_ptr,
121 ca_buffer_limit-current_ca_file_ptr,
122 BEGIN_CERT,
123 begin_cert_len);
124 if(!begin_cert_ptr || !is_cr_or_lf(begin_cert_ptr[begin_cert_len])) {
125 more_certs = 0;
126 }
127 else {
128 const char *end_cert_ptr = c_memmem(begin_cert_ptr,
129 ca_buffer_limit-begin_cert_ptr,
130 END_CERT,
131 end_cert_len);
132 if(!end_cert_ptr) {
133 failf(data,
134 "schannel: CA file '%s' is not correctly formatted",
135 ca_file_text);
136 result = CURLE_SSL_CACERT_BADFILE;
137 more_certs = 0;
138 }
139 else {
140 CERT_BLOB cert_blob;
141 CERT_CONTEXT *cert_context = NULL;
142 BOOL add_cert_result = FALSE;
143 DWORD actual_content_type = 0;
144 DWORD cert_size = (DWORD)
145 ((end_cert_ptr + end_cert_len) - begin_cert_ptr);
146
147 cert_blob.pbData = (BYTE *)begin_cert_ptr;
148 cert_blob.cbData = cert_size;
149 if(!CryptQueryObject(CERT_QUERY_OBJECT_BLOB,
150 &cert_blob,
151 CERT_QUERY_CONTENT_FLAG_CERT,
152 CERT_QUERY_FORMAT_FLAG_ALL,
153 0,
154 NULL,
155 &actual_content_type,
156 NULL,
157 NULL,
158 NULL,
159 (const void **)&cert_context)) {
160 char buffer[STRERROR_LEN];
161 failf(data,
162 "schannel: failed to extract certificate from CA file "
163 "'%s': %s",
164 ca_file_text,
165 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
166 result = CURLE_SSL_CACERT_BADFILE;
167 more_certs = 0;
168 }
169 else {
170 current_ca_file_ptr = begin_cert_ptr + cert_size;
171
172 /* Sanity check that the cert_context object is the right type */
173 if(CERT_QUERY_CONTENT_CERT != actual_content_type) {
174 failf(data,
175 "schannel: unexpected content type '%lu' when extracting "
176 "certificate from CA file '%s'",
177 actual_content_type, ca_file_text);
178 result = CURLE_SSL_CACERT_BADFILE;
179 more_certs = 0;
180 }
181 else {
182 add_cert_result =
183 CertAddCertificateContextToStore(trust_store,
184 cert_context,
185 CERT_STORE_ADD_ALWAYS,
186 NULL);
187 CertFreeCertificateContext(cert_context);
188 if(!add_cert_result) {
189 char buffer[STRERROR_LEN];
190 failf(data,
191 "schannel: failed to add certificate from CA file '%s' "
192 "to certificate store: %s",
193 ca_file_text,
194 Curl_winapi_strerror(GetLastError(), buffer,
195 sizeof(buffer)));
196 result = CURLE_SSL_CACERT_BADFILE;
197 more_certs = 0;
198 }
199 else {
200 num_certs++;
201 }
202 }
203 }
204 }
205 }
206 }
207
208 if(result == CURLE_OK) {
209 if(!num_certs) {
210 infof(data,
211 "schannel: did not add any certificates from CA file '%s'",
212 ca_file_text);
213 }
214 else {
215 infof(data,
216 "schannel: added %d certificate(s) from CA file '%s'",
217 num_certs, ca_file_text);
218 }
219 }
220 return result;
221 }
222
add_certs_file_to_store(HCERTSTORE trust_store,const char * ca_file,struct Curl_easy * data)223 static CURLcode add_certs_file_to_store(HCERTSTORE trust_store,
224 const char *ca_file,
225 struct Curl_easy *data)
226 {
227 CURLcode result;
228 HANDLE ca_file_handle = INVALID_HANDLE_VALUE;
229 LARGE_INTEGER file_size;
230 char *ca_file_buffer = NULL;
231 TCHAR *ca_file_tstr = NULL;
232 size_t ca_file_bufsize = 0;
233 DWORD total_bytes_read = 0;
234
235 ca_file_tstr = curlx_convert_UTF8_to_tchar((char *)ca_file);
236 if(!ca_file_tstr) {
237 char buffer[STRERROR_LEN];
238 failf(data,
239 "schannel: invalid path name for CA file '%s': %s",
240 ca_file,
241 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
242 result = CURLE_SSL_CACERT_BADFILE;
243 goto cleanup;
244 }
245
246 /*
247 * Read the CA file completely into memory before parsing it. This
248 * optimizes for the common case where the CA file will be relatively
249 * small ( < 1 MiB ).
250 */
251 ca_file_handle = CreateFile(ca_file_tstr,
252 GENERIC_READ,
253 FILE_SHARE_READ,
254 NULL,
255 OPEN_EXISTING,
256 FILE_ATTRIBUTE_NORMAL,
257 NULL);
258 if(ca_file_handle == INVALID_HANDLE_VALUE) {
259 char buffer[STRERROR_LEN];
260 failf(data,
261 "schannel: failed to open CA file '%s': %s",
262 ca_file,
263 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
264 result = CURLE_SSL_CACERT_BADFILE;
265 goto cleanup;
266 }
267
268 if(!GetFileSizeEx(ca_file_handle, &file_size)) {
269 char buffer[STRERROR_LEN];
270 failf(data,
271 "schannel: failed to determine size of CA file '%s': %s",
272 ca_file,
273 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
274 result = CURLE_SSL_CACERT_BADFILE;
275 goto cleanup;
276 }
277
278 if(file_size.QuadPart > MAX_CAFILE_SIZE) {
279 failf(data,
280 "schannel: CA file exceeds max size of %u bytes",
281 MAX_CAFILE_SIZE);
282 result = CURLE_SSL_CACERT_BADFILE;
283 goto cleanup;
284 }
285
286 ca_file_bufsize = (size_t)file_size.QuadPart;
287 ca_file_buffer = (char *)malloc(ca_file_bufsize + 1);
288 if(!ca_file_buffer) {
289 result = CURLE_OUT_OF_MEMORY;
290 goto cleanup;
291 }
292
293 while(total_bytes_read < ca_file_bufsize) {
294 DWORD bytes_to_read = (DWORD)(ca_file_bufsize - total_bytes_read);
295 DWORD bytes_read = 0;
296
297 if(!ReadFile(ca_file_handle, ca_file_buffer + total_bytes_read,
298 bytes_to_read, &bytes_read, NULL)) {
299 char buffer[STRERROR_LEN];
300 failf(data,
301 "schannel: failed to read from CA file '%s': %s",
302 ca_file,
303 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
304 result = CURLE_SSL_CACERT_BADFILE;
305 goto cleanup;
306 }
307 if(bytes_read == 0) {
308 /* Premature EOF -- adjust the bufsize to the new value */
309 ca_file_bufsize = total_bytes_read;
310 }
311 else {
312 total_bytes_read += bytes_read;
313 }
314 }
315
316 /* Null terminate the buffer */
317 ca_file_buffer[ca_file_bufsize] = '\0';
318
319 result = add_certs_data_to_store(trust_store,
320 ca_file_buffer, ca_file_bufsize,
321 ca_file,
322 data);
323
324 cleanup:
325 if(ca_file_handle != INVALID_HANDLE_VALUE) {
326 CloseHandle(ca_file_handle);
327 }
328 Curl_safefree(ca_file_buffer);
329 curlx_unicodefree(ca_file_tstr);
330
331 return result;
332 }
333
334 #endif /* HAS_MANUAL_VERIFY_API */
335
336 /*
337 * Returns the number of characters necessary to populate all the host_names.
338 * If host_names is not NULL, populate it with all the host names. Each string
339 * in the host_names is null-terminated and the last string is double
340 * null-terminated. If no DNS names are found, a single null-terminated empty
341 * string is returned.
342 */
cert_get_name_string(struct Curl_easy * data,CERT_CONTEXT * cert_context,LPTSTR host_names,DWORD length)343 static DWORD cert_get_name_string(struct Curl_easy *data,
344 CERT_CONTEXT *cert_context,
345 LPTSTR host_names,
346 DWORD length)
347 {
348 DWORD actual_length = 0;
349 BOOL compute_content = FALSE;
350 CERT_INFO *cert_info = NULL;
351 CERT_EXTENSION *extension = NULL;
352 CRYPT_DECODE_PARA decode_para = {0, 0, 0};
353 CERT_ALT_NAME_INFO *alt_name_info = NULL;
354 DWORD alt_name_info_size = 0;
355 BOOL ret_val = FALSE;
356 LPTSTR current_pos = NULL;
357 DWORD i;
358
359 #ifdef CERT_NAME_SEARCH_ALL_NAMES_FLAG
360 /* CERT_NAME_SEARCH_ALL_NAMES_FLAG is available from Windows 8 onwards. */
361 if(curlx_verify_windows_version(6, 2, 0, PLATFORM_WINNT,
362 VERSION_GREATER_THAN_EQUAL)) {
363 /* CertGetNameString will provide the 8-bit character string without
364 * any decoding */
365 DWORD name_flags =
366 CERT_NAME_DISABLE_IE4_UTF8_FLAG | CERT_NAME_SEARCH_ALL_NAMES_FLAG;
367 actual_length = CertGetNameString(cert_context,
368 CERT_NAME_DNS_TYPE,
369 name_flags,
370 NULL,
371 host_names,
372 length);
373 return actual_length;
374 }
375 #endif
376
377 compute_content = host_names != NULL && length != 0;
378
379 /* Initialize default return values. */
380 actual_length = 1;
381 if(compute_content) {
382 *host_names = '\0';
383 }
384
385 if(!cert_context) {
386 failf(data, "schannel: Null certificate context.");
387 return actual_length;
388 }
389
390 cert_info = cert_context->pCertInfo;
391 if(!cert_info) {
392 failf(data, "schannel: Null certificate info.");
393 return actual_length;
394 }
395
396 extension = CertFindExtension(szOID_SUBJECT_ALT_NAME2,
397 cert_info->cExtension,
398 cert_info->rgExtension);
399 if(!extension) {
400 failf(data, "schannel: CertFindExtension() returned no extension.");
401 return actual_length;
402 }
403
404 decode_para.cbSize = sizeof(CRYPT_DECODE_PARA);
405
406 ret_val =
407 CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
408 szOID_SUBJECT_ALT_NAME2,
409 extension->Value.pbData,
410 extension->Value.cbData,
411 CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG,
412 &decode_para,
413 &alt_name_info,
414 &alt_name_info_size);
415 if(!ret_val) {
416 failf(data,
417 "schannel: CryptDecodeObjectEx() returned no alternate name "
418 "information.");
419 return actual_length;
420 }
421
422 current_pos = host_names;
423
424 /* Iterate over the alternate names and populate host_names. */
425 for(i = 0; i < alt_name_info->cAltEntry; i++) {
426 const CERT_ALT_NAME_ENTRY *entry = &alt_name_info->rgAltEntry[i];
427 wchar_t *dns_w = NULL;
428 size_t current_length = 0;
429
430 if(entry->dwAltNameChoice != CERT_ALT_NAME_DNS_NAME) {
431 continue;
432 }
433 if(!entry->pwszDNSName) {
434 infof(data, "schannel: Empty DNS name.");
435 continue;
436 }
437 current_length = wcslen(entry->pwszDNSName) + 1;
438 if(!compute_content) {
439 actual_length += (DWORD)current_length;
440 continue;
441 }
442 /* Sanity check to prevent buffer overrun. */
443 if((actual_length + current_length) > length) {
444 failf(data, "schannel: Not enough memory to list all host names.");
445 break;
446 }
447 dns_w = entry->pwszDNSName;
448 /* pwszDNSName is in ia5 string format and hence doesn't contain any
449 * non-ascii characters. */
450 while(*dns_w != '\0') {
451 *current_pos++ = (char)(*dns_w++);
452 }
453 *current_pos++ = '\0';
454 actual_length += (DWORD)current_length;
455 }
456 if(compute_content) {
457 /* Last string has double null-terminator. */
458 *current_pos = '\0';
459 }
460 return actual_length;
461 }
462
463 /* Verify the server's hostname */
Curl_verify_host(struct Curl_cfilter * cf,struct Curl_easy * data)464 CURLcode Curl_verify_host(struct Curl_cfilter *cf,
465 struct Curl_easy *data)
466 {
467 struct ssl_connect_data *connssl = cf->ctx;
468 SECURITY_STATUS sspi_status;
469 CURLcode result = CURLE_PEER_FAILED_VERIFICATION;
470 CERT_CONTEXT *pCertContextServer = NULL;
471 TCHAR *cert_hostname_buff = NULL;
472 size_t cert_hostname_buff_index = 0;
473 const char *conn_hostname = connssl->peer.hostname;
474 size_t hostlen = strlen(conn_hostname);
475 DWORD len = 0;
476 DWORD actual_len = 0;
477
478 sspi_status =
479 s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
480 SECPKG_ATTR_REMOTE_CERT_CONTEXT,
481 &pCertContextServer);
482
483 if((sspi_status != SEC_E_OK) || !pCertContextServer) {
484 char buffer[STRERROR_LEN];
485 failf(data, "schannel: Failed to read remote certificate context: %s",
486 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
487 result = CURLE_PEER_FAILED_VERIFICATION;
488 goto cleanup;
489 }
490
491 /* Determine the size of the string needed for the cert hostname */
492 len = cert_get_name_string(data, pCertContextServer, NULL, 0);
493 if(len == 0) {
494 failf(data,
495 "schannel: CertGetNameString() returned no "
496 "certificate name information");
497 result = CURLE_PEER_FAILED_VERIFICATION;
498 goto cleanup;
499 }
500
501 /* CertGetNameString guarantees that the returned name will not contain
502 * embedded null bytes. This appears to be undocumented behavior.
503 */
504 cert_hostname_buff = (LPTSTR)malloc(len * sizeof(TCHAR));
505 if(!cert_hostname_buff) {
506 result = CURLE_OUT_OF_MEMORY;
507 goto cleanup;
508 }
509 actual_len = cert_get_name_string(
510 data, pCertContextServer, (LPTSTR)cert_hostname_buff, len);
511
512 /* Sanity check */
513 if(actual_len != len) {
514 failf(data,
515 "schannel: CertGetNameString() returned certificate "
516 "name information of unexpected size");
517 result = CURLE_PEER_FAILED_VERIFICATION;
518 goto cleanup;
519 }
520
521 /* cert_hostname_buff contains all DNS names, where each name is
522 * null-terminated and the last DNS name is double null-terminated. Due to
523 * this encoding, use the length of the buffer to iterate over all names.
524 */
525 result = CURLE_PEER_FAILED_VERIFICATION;
526 while(cert_hostname_buff_index < len &&
527 cert_hostname_buff[cert_hostname_buff_index] != TEXT('\0') &&
528 result == CURLE_PEER_FAILED_VERIFICATION) {
529
530 char *cert_hostname;
531
532 /* Comparing the cert name and the connection hostname encoded as UTF-8
533 * is acceptable since both values are assumed to use ASCII
534 * (or some equivalent) encoding
535 */
536 cert_hostname = curlx_convert_tchar_to_UTF8(
537 &cert_hostname_buff[cert_hostname_buff_index]);
538 if(!cert_hostname) {
539 result = CURLE_OUT_OF_MEMORY;
540 }
541 else {
542 if(Curl_cert_hostcheck(cert_hostname, strlen(cert_hostname),
543 conn_hostname, hostlen)) {
544 infof(data,
545 "schannel: connection hostname (%s) validated "
546 "against certificate name (%s)",
547 conn_hostname, cert_hostname);
548 result = CURLE_OK;
549 }
550 else {
551 size_t cert_hostname_len;
552
553 infof(data,
554 "schannel: connection hostname (%s) did not match "
555 "against certificate name (%s)",
556 conn_hostname, cert_hostname);
557
558 cert_hostname_len =
559 _tcslen(&cert_hostname_buff[cert_hostname_buff_index]);
560
561 /* Move on to next cert name */
562 cert_hostname_buff_index += cert_hostname_len + 1;
563
564 result = CURLE_PEER_FAILED_VERIFICATION;
565 }
566 curlx_unicodefree(cert_hostname);
567 }
568 }
569
570 if(result == CURLE_PEER_FAILED_VERIFICATION) {
571 failf(data,
572 "schannel: CertGetNameString() failed to match "
573 "connection hostname (%s) against server certificate names",
574 conn_hostname);
575 }
576 else if(result != CURLE_OK)
577 failf(data, "schannel: server certificate name verification failed");
578
579 cleanup:
580 Curl_safefree(cert_hostname_buff);
581
582 if(pCertContextServer)
583 CertFreeCertificateContext(pCertContextServer);
584
585 return result;
586 }
587
588
589 #ifdef HAS_MANUAL_VERIFY_API
590 /* Verify the server's certificate and hostname */
Curl_verify_certificate(struct Curl_cfilter * cf,struct Curl_easy * data)591 CURLcode Curl_verify_certificate(struct Curl_cfilter *cf,
592 struct Curl_easy *data)
593 {
594 struct ssl_connect_data *connssl = cf->ctx;
595 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
596 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
597 SECURITY_STATUS sspi_status;
598 CURLcode result = CURLE_OK;
599 CERT_CONTEXT *pCertContextServer = NULL;
600 const CERT_CHAIN_CONTEXT *pChainContext = NULL;
601 HCERTCHAINENGINE cert_chain_engine = NULL;
602 HCERTSTORE trust_store = NULL;
603 HCERTSTORE own_trust_store = NULL;
604
605 DEBUGASSERT(BACKEND);
606
607 sspi_status =
608 s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
609 SECPKG_ATTR_REMOTE_CERT_CONTEXT,
610 &pCertContextServer);
611
612 if((sspi_status != SEC_E_OK) || !pCertContextServer) {
613 char buffer[STRERROR_LEN];
614 failf(data, "schannel: Failed to read remote certificate context: %s",
615 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
616 result = CURLE_PEER_FAILED_VERIFICATION;
617 }
618
619 if(result == CURLE_OK &&
620 (conn_config->CAfile || conn_config->ca_info_blob) &&
621 BACKEND->use_manual_cred_validation) {
622 /*
623 * Create a chain engine that uses the certificates in the CA file as
624 * trusted certificates. This is only supported on Windows 7+.
625 */
626
627 if(curlx_verify_windows_version(6, 1, 0, PLATFORM_WINNT,
628 VERSION_LESS_THAN)) {
629 failf(data, "schannel: this version of Windows is too old to support "
630 "certificate verification via CA bundle file.");
631 result = CURLE_SSL_CACERT_BADFILE;
632 }
633 else {
634 /* try cache */
635 trust_store = Curl_schannel_get_cached_cert_store(cf, data);
636
637 if(trust_store) {
638 infof(data, "schannel: reusing certificate store from cache");
639 }
640 else {
641 /* Open the certificate store */
642 trust_store = CertOpenStore(CERT_STORE_PROV_MEMORY,
643 0,
644 (HCRYPTPROV)NULL,
645 CERT_STORE_CREATE_NEW_FLAG,
646 NULL);
647 if(!trust_store) {
648 char buffer[STRERROR_LEN];
649 failf(data, "schannel: failed to create certificate store: %s",
650 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
651 result = CURLE_SSL_CACERT_BADFILE;
652 }
653 else {
654 const struct curl_blob *ca_info_blob = conn_config->ca_info_blob;
655 own_trust_store = trust_store;
656
657 if(ca_info_blob) {
658 result = add_certs_data_to_store(trust_store,
659 (const char *)ca_info_blob->data,
660 ca_info_blob->len,
661 "(memory blob)",
662 data);
663 }
664 else {
665 result = add_certs_file_to_store(trust_store,
666 conn_config->CAfile,
667 data);
668 }
669 if(result == CURLE_OK) {
670 if(Curl_schannel_set_cached_cert_store(cf, data, trust_store)) {
671 own_trust_store = NULL;
672 }
673 }
674 }
675 }
676 }
677
678 if(result == CURLE_OK) {
679 struct cert_chain_engine_config_win7 engine_config;
680 BOOL create_engine_result;
681
682 memset(&engine_config, 0, sizeof(engine_config));
683 engine_config.cbSize = sizeof(engine_config);
684 engine_config.hExclusiveRoot = trust_store;
685
686 /* CertCreateCertificateChainEngine will check the expected size of the
687 * CERT_CHAIN_ENGINE_CONFIG structure and fail if the specified size
688 * does not match the expected size. When this occurs, it indicates that
689 * CAINFO is not supported on the version of Windows in use.
690 */
691 create_engine_result =
692 CertCreateCertificateChainEngine(
693 (CERT_CHAIN_ENGINE_CONFIG *)&engine_config, &cert_chain_engine);
694 if(!create_engine_result) {
695 char buffer[STRERROR_LEN];
696 failf(data,
697 "schannel: failed to create certificate chain engine: %s",
698 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
699 result = CURLE_SSL_CACERT_BADFILE;
700 }
701 }
702 }
703
704 if(result == CURLE_OK) {
705 CERT_CHAIN_PARA ChainPara;
706
707 memset(&ChainPara, 0, sizeof(ChainPara));
708 ChainPara.cbSize = sizeof(ChainPara);
709
710 if(!CertGetCertificateChain(cert_chain_engine,
711 pCertContextServer,
712 NULL,
713 pCertContextServer->hCertStore,
714 &ChainPara,
715 (ssl_config->no_revoke ? 0 :
716 CERT_CHAIN_REVOCATION_CHECK_CHAIN),
717 NULL,
718 &pChainContext)) {
719 char buffer[STRERROR_LEN];
720 failf(data, "schannel: CertGetCertificateChain failed: %s",
721 Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
722 pChainContext = NULL;
723 result = CURLE_PEER_FAILED_VERIFICATION;
724 }
725
726 if(result == CURLE_OK) {
727 CERT_SIMPLE_CHAIN *pSimpleChain = pChainContext->rgpChain[0];
728 DWORD dwTrustErrorMask = ~(DWORD)(CERT_TRUST_IS_NOT_TIME_NESTED);
729 dwTrustErrorMask &= pSimpleChain->TrustStatus.dwErrorStatus;
730
731 if(data->set.ssl.revoke_best_effort) {
732 /* Ignore errors when root certificates are missing the revocation
733 * list URL, or when the list could not be downloaded because the
734 * server is currently unreachable. */
735 dwTrustErrorMask &= ~(DWORD)(CERT_TRUST_REVOCATION_STATUS_UNKNOWN |
736 CERT_TRUST_IS_OFFLINE_REVOCATION);
737 }
738
739 if(dwTrustErrorMask) {
740 if(dwTrustErrorMask & CERT_TRUST_IS_REVOKED)
741 failf(data, "schannel: CertGetCertificateChain trust error"
742 " CERT_TRUST_IS_REVOKED");
743 else if(dwTrustErrorMask & CERT_TRUST_IS_PARTIAL_CHAIN)
744 failf(data, "schannel: CertGetCertificateChain trust error"
745 " CERT_TRUST_IS_PARTIAL_CHAIN");
746 else if(dwTrustErrorMask & CERT_TRUST_IS_UNTRUSTED_ROOT)
747 failf(data, "schannel: CertGetCertificateChain trust error"
748 " CERT_TRUST_IS_UNTRUSTED_ROOT");
749 else if(dwTrustErrorMask & CERT_TRUST_IS_NOT_TIME_VALID)
750 failf(data, "schannel: CertGetCertificateChain trust error"
751 " CERT_TRUST_IS_NOT_TIME_VALID");
752 else if(dwTrustErrorMask & CERT_TRUST_REVOCATION_STATUS_UNKNOWN)
753 failf(data, "schannel: CertGetCertificateChain trust error"
754 " CERT_TRUST_REVOCATION_STATUS_UNKNOWN");
755 else
756 failf(data, "schannel: CertGetCertificateChain error mask: 0x%08lx",
757 dwTrustErrorMask);
758 result = CURLE_PEER_FAILED_VERIFICATION;
759 }
760 }
761 }
762
763 if(result == CURLE_OK) {
764 if(conn_config->verifyhost) {
765 result = Curl_verify_host(cf, data);
766 }
767 }
768
769 if(cert_chain_engine) {
770 CertFreeCertificateChainEngine(cert_chain_engine);
771 }
772
773 if(own_trust_store) {
774 CertCloseStore(own_trust_store, 0);
775 }
776
777 if(pChainContext)
778 CertFreeCertificateChain(pChainContext);
779
780 if(pCertContextServer)
781 CertFreeCertificateContext(pCertContextServer);
782
783 return result;
784 }
785
786 #endif /* HAS_MANUAL_VERIFY_API */
787 #endif /* USE_SCHANNEL */
788
