1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 * Copyright (C) Marc Hoersken, <info@marc-hoersken.de>
10 * Copyright (C) Mark Salisbury, <mark.salisbury@hp.com>
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 all Schannel-specific code for the TLS/SSL layer. No code
29 * but vtls.c should ever call or use these functions.
30 */
31
32 #include "curl_setup.h"
33
34 #ifdef USE_SCHANNEL
35
36 #ifndef USE_WINDOWS_SSPI
37 # error "cannot compile SCHANNEL support without SSPI."
38 #endif
39
40 #include "schannel.h"
41 #include "schannel_int.h"
42 #include "vtls.h"
43 #include "vtls_int.h"
44 #include "strcase.h"
45 #include "sendf.h"
46 #include "connect.h" /* for the connect timeout */
47 #include "strerror.h"
48 #include "select.h" /* for the socket readiness */
49 #include "inet_pton.h" /* for IP addr SNI check */
50 #include "curl_multibyte.h"
51 #include "warnless.h"
52 #include "x509asn1.h"
53 #include "curl_printf.h"
54 #include "multiif.h"
55 #include "version_win32.h"
56 #include "rand.h"
57
58 /* The last #include file should be: */
59 #include "curl_memory.h"
60 #include "memdebug.h"
61
62 /* ALPN requires version 8.1 of the Windows SDK, which was
63 shipped with Visual Studio 2013, aka _MSC_VER 1800:
64
65 https://technet.microsoft.com/en-us/library/hh831771%28v=ws.11%29.aspx
66 */
67 #if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(_USING_V110_SDK71_)
68 # define HAS_ALPN 1
69 #endif
70
71 #ifndef BCRYPT_CHACHA20_POLY1305_ALGORITHM
72 #define BCRYPT_CHACHA20_POLY1305_ALGORITHM L"CHACHA20_POLY1305"
73 #endif
74
75 #ifndef BCRYPT_CHAIN_MODE_CCM
76 #define BCRYPT_CHAIN_MODE_CCM L"ChainingModeCCM"
77 #endif
78
79 #ifndef BCRYPT_CHAIN_MODE_GCM
80 #define BCRYPT_CHAIN_MODE_GCM L"ChainingModeGCM"
81 #endif
82
83 #ifndef BCRYPT_AES_ALGORITHM
84 #define BCRYPT_AES_ALGORITHM L"AES"
85 #endif
86
87 #ifndef BCRYPT_SHA256_ALGORITHM
88 #define BCRYPT_SHA256_ALGORITHM L"SHA256"
89 #endif
90
91 #ifndef BCRYPT_SHA384_ALGORITHM
92 #define BCRYPT_SHA384_ALGORITHM L"SHA384"
93 #endif
94
95 #ifdef HAS_CLIENT_CERT_PATH
96 #ifdef UNICODE
97 #define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_W
98 #else
99 #define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_A
100 #endif
101 #endif
102
103 #ifndef SP_PROT_TLS1_0_CLIENT
104 #define SP_PROT_TLS1_0_CLIENT SP_PROT_TLS1_CLIENT
105 #endif
106
107 #ifndef SP_PROT_TLS1_1_CLIENT
108 #define SP_PROT_TLS1_1_CLIENT 0x00000200
109 #endif
110
111 #ifndef SP_PROT_TLS1_2_CLIENT
112 #define SP_PROT_TLS1_2_CLIENT 0x00000800
113 #endif
114
115 #ifndef SP_PROT_TLS1_3_CLIENT
116 #define SP_PROT_TLS1_3_CLIENT 0x00002000
117 #endif
118
119 #ifndef SCH_USE_STRONG_CRYPTO
120 #define SCH_USE_STRONG_CRYPTO 0x00400000
121 #endif
122
123 #ifndef SECBUFFER_ALERT
124 #define SECBUFFER_ALERT 17
125 #endif
126
127 /* Both schannel buffer sizes must be > 0 */
128 #define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
129 #define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
130
131 #define CERT_THUMBPRINT_STR_LEN 40
132 #define CERT_THUMBPRINT_DATA_LEN 20
133
134 /* Uncomment to force verbose output
135 * #define infof(x, y, ...) printf(y, __VA_ARGS__)
136 * #define failf(x, y, ...) printf(y, __VA_ARGS__)
137 */
138
139 #ifndef CALG_SHA_256
140 # define CALG_SHA_256 0x0000800c
141 #endif
142
143 #ifndef PKCS12_NO_PERSIST_KEY
144 #define PKCS12_NO_PERSIST_KEY 0x00008000
145 #endif
146
147 static CURLcode schannel_pkp_pin_peer_pubkey(struct Curl_cfilter *cf,
148 struct Curl_easy *data,
149 const char *pinnedpubkey);
150
InitSecBuffer(SecBuffer * buffer,unsigned long BufType,void * BufDataPtr,unsigned long BufByteSize)151 static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
152 void *BufDataPtr, unsigned long BufByteSize)
153 {
154 buffer->cbBuffer = BufByteSize;
155 buffer->BufferType = BufType;
156 buffer->pvBuffer = BufDataPtr;
157 }
158
InitSecBufferDesc(SecBufferDesc * desc,SecBuffer * BufArr,unsigned long NumArrElem)159 static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
160 unsigned long NumArrElem)
161 {
162 desc->ulVersion = SECBUFFER_VERSION;
163 desc->pBuffers = BufArr;
164 desc->cBuffers = NumArrElem;
165 }
166
167 static CURLcode
schannel_set_ssl_version_min_max(DWORD * enabled_protocols,struct Curl_cfilter * cf,struct Curl_easy * data)168 schannel_set_ssl_version_min_max(DWORD *enabled_protocols,
169 struct Curl_cfilter *cf,
170 struct Curl_easy *data)
171 {
172 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
173 long ssl_version = conn_config->version;
174 long ssl_version_max = (long)conn_config->version_max;
175 long i = ssl_version;
176
177 switch(ssl_version_max) {
178 case CURL_SSLVERSION_MAX_NONE:
179 case CURL_SSLVERSION_MAX_DEFAULT:
180
181 /* Windows Server 2022 and newer (including Windows 11) support TLS 1.3
182 built-in. Previous builds of Windows 10 had broken TLS 1.3
183 implementations that could be enabled via registry.
184 */
185 if(curlx_verify_windows_version(10, 0, 20348, PLATFORM_WINNT,
186 VERSION_GREATER_THAN_EQUAL)) {
187 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_3;
188 }
189 else /* Windows 10 and older */
190 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
191
192 break;
193 }
194
195 for(; i <= (ssl_version_max >> 16); ++i) {
196 switch(i) {
197 case CURL_SSLVERSION_TLSv1_0:
198 (*enabled_protocols) |= SP_PROT_TLS1_0_CLIENT;
199 break;
200 case CURL_SSLVERSION_TLSv1_1:
201 (*enabled_protocols) |= SP_PROT_TLS1_1_CLIENT;
202 break;
203 case CURL_SSLVERSION_TLSv1_2:
204 (*enabled_protocols) |= SP_PROT_TLS1_2_CLIENT;
205 break;
206 case CURL_SSLVERSION_TLSv1_3:
207
208 /* Windows Server 2022 and newer */
209 if(curlx_verify_windows_version(10, 0, 20348, PLATFORM_WINNT,
210 VERSION_GREATER_THAN_EQUAL)) {
211 (*enabled_protocols) |= SP_PROT_TLS1_3_CLIENT;
212 break;
213 }
214 else { /* Windows 10 and older */
215 failf(data, "schannel: TLS 1.3 not supported on Windows prior to 11");
216 return CURLE_SSL_CONNECT_ERROR;
217 }
218 }
219 }
220 return CURLE_OK;
221 }
222
223 /* longest is 26, buffer is slightly bigger */
224 #define LONGEST_ALG_ID 32
225 #define CIPHEROPTION(x) {#x, x}
226
227 struct algo {
228 const char *name;
229 int id;
230 };
231
232 static const struct algo algs[]= {
233 CIPHEROPTION(CALG_MD2),
234 CIPHEROPTION(CALG_MD4),
235 CIPHEROPTION(CALG_MD5),
236 CIPHEROPTION(CALG_SHA),
237 CIPHEROPTION(CALG_SHA1),
238 CIPHEROPTION(CALG_MAC),
239 CIPHEROPTION(CALG_RSA_SIGN),
240 CIPHEROPTION(CALG_DSS_SIGN),
241 /* ifdefs for the options that are defined conditionally in wincrypt.h */
242 #ifdef CALG_NO_SIGN
243 CIPHEROPTION(CALG_NO_SIGN),
244 #endif
245 CIPHEROPTION(CALG_RSA_KEYX),
246 CIPHEROPTION(CALG_DES),
247 #ifdef CALG_3DES_112
248 CIPHEROPTION(CALG_3DES_112),
249 #endif
250 CIPHEROPTION(CALG_3DES),
251 CIPHEROPTION(CALG_DESX),
252 CIPHEROPTION(CALG_RC2),
253 CIPHEROPTION(CALG_RC4),
254 CIPHEROPTION(CALG_SEAL),
255 #ifdef CALG_DH_SF
256 CIPHEROPTION(CALG_DH_SF),
257 #endif
258 CIPHEROPTION(CALG_DH_EPHEM),
259 #ifdef CALG_AGREEDKEY_ANY
260 CIPHEROPTION(CALG_AGREEDKEY_ANY),
261 #endif
262 #ifdef CALG_HUGHES_MD5
263 CIPHEROPTION(CALG_HUGHES_MD5),
264 #endif
265 CIPHEROPTION(CALG_SKIPJACK),
266 #ifdef CALG_TEK
267 CIPHEROPTION(CALG_TEK),
268 #endif
269 CIPHEROPTION(CALG_CYLINK_MEK),
270 CIPHEROPTION(CALG_SSL3_SHAMD5),
271 #ifdef CALG_SSL3_MASTER
272 CIPHEROPTION(CALG_SSL3_MASTER),
273 #endif
274 #ifdef CALG_SCHANNEL_MASTER_HASH
275 CIPHEROPTION(CALG_SCHANNEL_MASTER_HASH),
276 #endif
277 #ifdef CALG_SCHANNEL_MAC_KEY
278 CIPHEROPTION(CALG_SCHANNEL_MAC_KEY),
279 #endif
280 #ifdef CALG_SCHANNEL_ENC_KEY
281 CIPHEROPTION(CALG_SCHANNEL_ENC_KEY),
282 #endif
283 #ifdef CALG_PCT1_MASTER
284 CIPHEROPTION(CALG_PCT1_MASTER),
285 #endif
286 #ifdef CALG_SSL2_MASTER
287 CIPHEROPTION(CALG_SSL2_MASTER),
288 #endif
289 #ifdef CALG_TLS1_MASTER
290 CIPHEROPTION(CALG_TLS1_MASTER),
291 #endif
292 #ifdef CALG_RC5
293 CIPHEROPTION(CALG_RC5),
294 #endif
295 #ifdef CALG_HMAC
296 CIPHEROPTION(CALG_HMAC),
297 #endif
298 #ifdef CALG_TLS1PRF
299 CIPHEROPTION(CALG_TLS1PRF),
300 #endif
301 #ifdef CALG_HASH_REPLACE_OWF
302 CIPHEROPTION(CALG_HASH_REPLACE_OWF),
303 #endif
304 #ifdef CALG_AES_128
305 CIPHEROPTION(CALG_AES_128),
306 #endif
307 #ifdef CALG_AES_192
308 CIPHEROPTION(CALG_AES_192),
309 #endif
310 #ifdef CALG_AES_256
311 CIPHEROPTION(CALG_AES_256),
312 #endif
313 #ifdef CALG_AES
314 CIPHEROPTION(CALG_AES),
315 #endif
316 #ifdef CALG_SHA_256
317 CIPHEROPTION(CALG_SHA_256),
318 #endif
319 #ifdef CALG_SHA_384
320 CIPHEROPTION(CALG_SHA_384),
321 #endif
322 #ifdef CALG_SHA_512
323 CIPHEROPTION(CALG_SHA_512),
324 #endif
325 #ifdef CALG_ECDH
326 CIPHEROPTION(CALG_ECDH),
327 #endif
328 #ifdef CALG_ECMQV
329 CIPHEROPTION(CALG_ECMQV),
330 #endif
331 #ifdef CALG_ECDSA
332 CIPHEROPTION(CALG_ECDSA),
333 #endif
334 #ifdef CALG_ECDH_EPHEM
335 CIPHEROPTION(CALG_ECDH_EPHEM),
336 #endif
337 {NULL, 0},
338 };
339
340 static int
get_alg_id_by_name(char * name)341 get_alg_id_by_name(char *name)
342 {
343 char *nameEnd = strchr(name, ':');
344 size_t n = nameEnd ? (size_t)(nameEnd - name) : strlen(name);
345 int i;
346
347 for(i = 0; algs[i].name; i++) {
348 if((n == strlen(algs[i].name) && !strncmp(algs[i].name, name, n)))
349 return algs[i].id;
350 }
351 return 0; /* not found */
352 }
353
354 #define NUM_CIPHERS 47 /* There are 47 options listed above */
355
356 static CURLcode
set_ssl_ciphers(SCHANNEL_CRED * schannel_cred,char * ciphers,ALG_ID * algIds)357 set_ssl_ciphers(SCHANNEL_CRED *schannel_cred, char *ciphers,
358 ALG_ID *algIds)
359 {
360 char *startCur = ciphers;
361 int algCount = 0;
362 while(startCur && (0 != *startCur) && (algCount < NUM_CIPHERS)) {
363 long alg = strtol(startCur, 0, 0);
364 if(!alg)
365 alg = get_alg_id_by_name(startCur);
366 if(alg)
367 algIds[algCount++] = (ALG_ID)alg;
368 else if(!strncmp(startCur, "USE_STRONG_CRYPTO",
369 sizeof("USE_STRONG_CRYPTO") - 1) ||
370 !strncmp(startCur, "SCH_USE_STRONG_CRYPTO",
371 sizeof("SCH_USE_STRONG_CRYPTO") - 1))
372 schannel_cred->dwFlags |= SCH_USE_STRONG_CRYPTO;
373 else
374 return CURLE_SSL_CIPHER;
375 startCur = strchr(startCur, ':');
376 if(startCur)
377 startCur++;
378 }
379 schannel_cred->palgSupportedAlgs = algIds;
380 schannel_cred->cSupportedAlgs = (DWORD)algCount;
381 return CURLE_OK;
382 }
383
384 #ifdef HAS_CLIENT_CERT_PATH
385
386 /* Function allocates memory for store_path only if CURLE_OK is returned */
387 static CURLcode
get_cert_location(TCHAR * path,DWORD * store_name,TCHAR ** store_path,TCHAR ** thumbprint)388 get_cert_location(TCHAR *path, DWORD *store_name, TCHAR **store_path,
389 TCHAR **thumbprint)
390 {
391 TCHAR *sep;
392 TCHAR *store_path_start;
393 size_t store_name_len;
394
395 sep = _tcschr(path, TEXT('\\'));
396 if(!sep)
397 return CURLE_SSL_CERTPROBLEM;
398
399 store_name_len = sep - path;
400
401 if(_tcsncmp(path, TEXT("CurrentUser"), store_name_len) == 0)
402 *store_name = CERT_SYSTEM_STORE_CURRENT_USER;
403 else if(_tcsncmp(path, TEXT("LocalMachine"), store_name_len) == 0)
404 *store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE;
405 else if(_tcsncmp(path, TEXT("CurrentService"), store_name_len) == 0)
406 *store_name = CERT_SYSTEM_STORE_CURRENT_SERVICE;
407 else if(_tcsncmp(path, TEXT("Services"), store_name_len) == 0)
408 *store_name = CERT_SYSTEM_STORE_SERVICES;
409 else if(_tcsncmp(path, TEXT("Users"), store_name_len) == 0)
410 *store_name = CERT_SYSTEM_STORE_USERS;
411 else if(_tcsncmp(path, TEXT("CurrentUserGroupPolicy"),
412 store_name_len) == 0)
413 *store_name = CERT_SYSTEM_STORE_CURRENT_USER_GROUP_POLICY;
414 else if(_tcsncmp(path, TEXT("LocalMachineGroupPolicy"),
415 store_name_len) == 0)
416 *store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_GROUP_POLICY;
417 else if(_tcsncmp(path, TEXT("LocalMachineEnterprise"),
418 store_name_len) == 0)
419 *store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE;
420 else
421 return CURLE_SSL_CERTPROBLEM;
422
423 store_path_start = sep + 1;
424
425 sep = _tcschr(store_path_start, TEXT('\\'));
426 if(!sep)
427 return CURLE_SSL_CERTPROBLEM;
428
429 *thumbprint = sep + 1;
430 if(_tcslen(*thumbprint) != CERT_THUMBPRINT_STR_LEN)
431 return CURLE_SSL_CERTPROBLEM;
432
433 *sep = TEXT('\0');
434 *store_path = _tcsdup(store_path_start);
435 *sep = TEXT('\\');
436 if(!*store_path)
437 return CURLE_OUT_OF_MEMORY;
438
439 return CURLE_OK;
440 }
441 #endif
442
algo(const char * check,char * namep,size_t nlen)443 static bool algo(const char *check, char *namep, size_t nlen)
444 {
445 return (strlen(check) == nlen) && !strncmp(check, namep, nlen);
446 }
447
448 static CURLcode
schannel_acquire_credential_handle(struct Curl_cfilter * cf,struct Curl_easy * data)449 schannel_acquire_credential_handle(struct Curl_cfilter *cf,
450 struct Curl_easy *data)
451 {
452 struct ssl_connect_data *connssl = cf->ctx;
453 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
454 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
455
456 #ifdef HAS_CLIENT_CERT_PATH
457 PCCERT_CONTEXT client_certs[1] = { NULL };
458 HCERTSTORE client_cert_store = NULL;
459 #endif
460 SECURITY_STATUS sspi_status = SEC_E_OK;
461 CURLcode result;
462
463 /* setup Schannel API options */
464 DWORD flags = 0;
465 DWORD enabled_protocols = 0;
466
467 struct schannel_ssl_backend_data *backend =
468 (struct schannel_ssl_backend_data *)(connssl->backend);
469
470 DEBUGASSERT(backend);
471
472 if(conn_config->verifypeer) {
473 #ifdef HAS_MANUAL_VERIFY_API
474 if(backend->use_manual_cred_validation)
475 flags = SCH_CRED_MANUAL_CRED_VALIDATION;
476 else
477 #endif
478 flags = SCH_CRED_AUTO_CRED_VALIDATION;
479
480 if(ssl_config->no_revoke) {
481 flags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
482 SCH_CRED_IGNORE_REVOCATION_OFFLINE;
483
484 DEBUGF(infof(data, "schannel: disabled server certificate revocation "
485 "checks"));
486 }
487 else if(ssl_config->revoke_best_effort) {
488 flags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
489 SCH_CRED_IGNORE_REVOCATION_OFFLINE | SCH_CRED_REVOCATION_CHECK_CHAIN;
490
491 DEBUGF(infof(data, "schannel: ignore revocation offline errors"));
492 }
493 else {
494 flags |= SCH_CRED_REVOCATION_CHECK_CHAIN;
495
496 DEBUGF(infof(data,
497 "schannel: checking server certificate revocation"));
498 }
499 }
500 else {
501 flags = SCH_CRED_MANUAL_CRED_VALIDATION |
502 SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
503 SCH_CRED_IGNORE_REVOCATION_OFFLINE;
504 DEBUGF(infof(data,
505 "schannel: disabled server cert revocation checks"));
506 }
507
508 if(!conn_config->verifyhost) {
509 flags |= SCH_CRED_NO_SERVERNAME_CHECK;
510 DEBUGF(infof(data, "schannel: verifyhost setting prevents Schannel from "
511 "comparing the supplied target name with the subject "
512 "names in server certificates."));
513 }
514
515 if(!ssl_config->auto_client_cert) {
516 flags &= ~(DWORD)SCH_CRED_USE_DEFAULT_CREDS;
517 flags |= SCH_CRED_NO_DEFAULT_CREDS;
518 infof(data, "schannel: disabled automatic use of client certificate");
519 }
520 else
521 infof(data, "schannel: enabled automatic use of client certificate");
522
523 switch(conn_config->version) {
524 case CURL_SSLVERSION_DEFAULT:
525 case CURL_SSLVERSION_TLSv1:
526 case CURL_SSLVERSION_TLSv1_0:
527 case CURL_SSLVERSION_TLSv1_1:
528 case CURL_SSLVERSION_TLSv1_2:
529 case CURL_SSLVERSION_TLSv1_3:
530 {
531 result = schannel_set_ssl_version_min_max(&enabled_protocols, cf, data);
532 if(result != CURLE_OK)
533 return result;
534 break;
535 }
536 case CURL_SSLVERSION_SSLv3:
537 case CURL_SSLVERSION_SSLv2:
538 failf(data, "SSL versions not supported");
539 return CURLE_NOT_BUILT_IN;
540 default:
541 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
542 return CURLE_SSL_CONNECT_ERROR;
543 }
544
545 #ifdef HAS_CLIENT_CERT_PATH
546 /* client certificate */
547 if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
548 DWORD cert_store_name = 0;
549 TCHAR *cert_store_path = NULL;
550 TCHAR *cert_thumbprint_str = NULL;
551 CRYPT_HASH_BLOB cert_thumbprint;
552 BYTE cert_thumbprint_data[CERT_THUMBPRINT_DATA_LEN];
553 HCERTSTORE cert_store = NULL;
554 FILE *fInCert = NULL;
555 void *certdata = NULL;
556 size_t certsize = 0;
557 bool blob = data->set.ssl.primary.cert_blob != NULL;
558 TCHAR *cert_path = NULL;
559 if(blob) {
560 certdata = data->set.ssl.primary.cert_blob->data;
561 certsize = data->set.ssl.primary.cert_blob->len;
562 }
563 else {
564 cert_path = curlx_convert_UTF8_to_tchar(
565 data->set.ssl.primary.clientcert);
566 if(!cert_path)
567 return CURLE_OUT_OF_MEMORY;
568
569 result = get_cert_location(cert_path, &cert_store_name,
570 &cert_store_path, &cert_thumbprint_str);
571
572 if(result && (data->set.ssl.primary.clientcert[0]!='\0'))
573 fInCert = fopen(data->set.ssl.primary.clientcert, "rb");
574
575 if(result && !fInCert) {
576 failf(data, "schannel: Failed to get certificate location"
577 " or file for %s",
578 data->set.ssl.primary.clientcert);
579 curlx_unicodefree(cert_path);
580 return result;
581 }
582 }
583
584 if((fInCert || blob) && (data->set.ssl.cert_type) &&
585 (!strcasecompare(data->set.ssl.cert_type, "P12"))) {
586 failf(data, "schannel: certificate format compatibility error "
587 " for %s",
588 blob ? "(memory blob)" : data->set.ssl.primary.clientcert);
589 curlx_unicodefree(cert_path);
590 return CURLE_SSL_CERTPROBLEM;
591 }
592
593 if(fInCert || blob) {
594 /* Reading a .P12 or .pfx file, like the example at bottom of
595 https://social.msdn.microsoft.com/Forums/windowsdesktop/
596 en-US/3e7bc95f-b21a-4bcd-bd2c-7f996718cae5
597 */
598 CRYPT_DATA_BLOB datablob;
599 WCHAR* pszPassword;
600 size_t pwd_len = 0;
601 int str_w_len = 0;
602 const char *cert_showfilename_error = blob ?
603 "(memory blob)" : data->set.ssl.primary.clientcert;
604 curlx_unicodefree(cert_path);
605 if(fInCert) {
606 long cert_tell = 0;
607 bool continue_reading = fseek(fInCert, 0, SEEK_END) == 0;
608 if(continue_reading)
609 cert_tell = ftell(fInCert);
610 if(cert_tell < 0)
611 continue_reading = FALSE;
612 else
613 certsize = (size_t)cert_tell;
614 if(continue_reading)
615 continue_reading = fseek(fInCert, 0, SEEK_SET) == 0;
616 if(continue_reading)
617 certdata = malloc(certsize + 1);
618 if((!certdata) ||
619 ((int) fread(certdata, certsize, 1, fInCert) != 1))
620 continue_reading = FALSE;
621 fclose(fInCert);
622 if(!continue_reading) {
623 failf(data, "schannel: Failed to read cert file %s",
624 data->set.ssl.primary.clientcert);
625 free(certdata);
626 return CURLE_SSL_CERTPROBLEM;
627 }
628 }
629
630 /* Convert key-pair data to the in-memory certificate store */
631 datablob.pbData = (BYTE*)certdata;
632 datablob.cbData = (DWORD)certsize;
633
634 if(data->set.ssl.key_passwd)
635 pwd_len = strlen(data->set.ssl.key_passwd);
636 pszPassword = (WCHAR*)malloc(sizeof(WCHAR)*(pwd_len + 1));
637 if(pszPassword) {
638 if(pwd_len > 0)
639 str_w_len = MultiByteToWideChar(CP_UTF8,
640 MB_ERR_INVALID_CHARS,
641 data->set.ssl.key_passwd,
642 (int)pwd_len,
643 pszPassword, (int)(pwd_len + 1));
644
645 if((str_w_len >= 0) && (str_w_len <= (int)pwd_len))
646 pszPassword[str_w_len] = 0;
647 else
648 pszPassword[0] = 0;
649
650 if(curlx_verify_windows_version(6, 0, 0, PLATFORM_WINNT,
651 VERSION_GREATER_THAN_EQUAL))
652 cert_store = PFXImportCertStore(&datablob, pszPassword,
653 PKCS12_NO_PERSIST_KEY);
654 else
655 cert_store = PFXImportCertStore(&datablob, pszPassword, 0);
656
657 free(pszPassword);
658 }
659 if(!blob)
660 free(certdata);
661 if(!cert_store) {
662 DWORD errorcode = GetLastError();
663 if(errorcode == ERROR_INVALID_PASSWORD)
664 failf(data, "schannel: Failed to import cert file %s, "
665 "password is bad",
666 cert_showfilename_error);
667 else
668 failf(data, "schannel: Failed to import cert file %s, "
669 "last error is 0x%lx",
670 cert_showfilename_error, errorcode);
671 return CURLE_SSL_CERTPROBLEM;
672 }
673
674 client_certs[0] = CertFindCertificateInStore(
675 cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
676 CERT_FIND_ANY, NULL, NULL);
677
678 if(!client_certs[0]) {
679 failf(data, "schannel: Failed to get certificate from file %s"
680 ", last error is 0x%lx",
681 cert_showfilename_error, GetLastError());
682 CertCloseStore(cert_store, 0);
683 return CURLE_SSL_CERTPROBLEM;
684 }
685 }
686 else {
687 cert_store =
688 CertOpenStore(CURL_CERT_STORE_PROV_SYSTEM, 0,
689 (HCRYPTPROV)NULL,
690 CERT_STORE_OPEN_EXISTING_FLAG | cert_store_name,
691 cert_store_path);
692 if(!cert_store) {
693 char *path_utf8 =
694 curlx_convert_tchar_to_UTF8(cert_store_path);
695 failf(data, "schannel: Failed to open cert store %lx %s, "
696 "last error is 0x%lx",
697 cert_store_name,
698 (path_utf8 ? path_utf8 : "(unknown)"),
699 GetLastError());
700 free(cert_store_path);
701 curlx_unicodefree(path_utf8);
702 curlx_unicodefree(cert_path);
703 return CURLE_SSL_CERTPROBLEM;
704 }
705 free(cert_store_path);
706
707 cert_thumbprint.pbData = cert_thumbprint_data;
708 cert_thumbprint.cbData = CERT_THUMBPRINT_DATA_LEN;
709
710 if(!CryptStringToBinary(cert_thumbprint_str,
711 CERT_THUMBPRINT_STR_LEN,
712 CRYPT_STRING_HEX,
713 cert_thumbprint_data,
714 &cert_thumbprint.cbData,
715 NULL, NULL)) {
716 curlx_unicodefree(cert_path);
717 CertCloseStore(cert_store, 0);
718 return CURLE_SSL_CERTPROBLEM;
719 }
720
721 client_certs[0] = CertFindCertificateInStore(
722 cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
723 CERT_FIND_HASH, &cert_thumbprint, NULL);
724
725 curlx_unicodefree(cert_path);
726
727 if(!client_certs[0]) {
728 /* CRYPT_E_NOT_FOUND / E_INVALIDARG */
729 CertCloseStore(cert_store, 0);
730 return CURLE_SSL_CERTPROBLEM;
731 }
732 }
733 client_cert_store = cert_store;
734 }
735 #else
736 if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
737 failf(data, "schannel: client cert support not built in");
738 return CURLE_NOT_BUILT_IN;
739 }
740 #endif
741
742 /* allocate memory for the reusable credential handle */
743 backend->cred = (struct Curl_schannel_cred *)
744 calloc(1, sizeof(struct Curl_schannel_cred));
745 if(!backend->cred) {
746 failf(data, "schannel: unable to allocate memory");
747
748 #ifdef HAS_CLIENT_CERT_PATH
749 if(client_certs[0])
750 CertFreeCertificateContext(client_certs[0]);
751 if(client_cert_store)
752 CertCloseStore(client_cert_store, 0);
753 #endif
754
755 return CURLE_OUT_OF_MEMORY;
756 }
757 backend->cred->refcount = 1;
758
759 #ifdef HAS_CLIENT_CERT_PATH
760 /* Since we did not persist the key, we need to extend the store's
761 * lifetime until the end of the connection
762 */
763 backend->cred->client_cert_store = client_cert_store;
764 #endif
765
766 /* We support TLS 1.3 starting in Windows 10 version 1809 (OS build 17763) as
767 long as the user did not set a legacy algorithm list
768 (CURLOPT_SSL_CIPHER_LIST). */
769 if(!conn_config->cipher_list &&
770 curlx_verify_windows_version(10, 0, 17763, PLATFORM_WINNT,
771 VERSION_GREATER_THAN_EQUAL)) {
772
773 char *ciphers13 = 0;
774
775 bool disable_aes_gcm_sha384 = FALSE;
776 bool disable_aes_gcm_sha256 = FALSE;
777 bool disable_chacha_poly = FALSE;
778 bool disable_aes_ccm_8_sha256 = FALSE;
779 bool disable_aes_ccm_sha256 = FALSE;
780
781 SCH_CREDENTIALS credentials = { 0 };
782 TLS_PARAMETERS tls_parameters = { 0 };
783 CRYPTO_SETTINGS crypto_settings[4] = { { 0 } };
784 UNICODE_STRING blocked_ccm_modes[1] = { { 0 } };
785 UNICODE_STRING blocked_gcm_modes[1] = { { 0 } };
786
787 int crypto_settings_idx = 0;
788
789
790 /* If TLS 1.3 ciphers are explicitly listed, then
791 * disable all the ciphers and re-enable which
792 * ciphers the user has provided.
793 */
794 ciphers13 = conn_config->cipher_list13;
795 if(ciphers13) {
796 const int remaining_ciphers = 5;
797
798 /* detect which remaining ciphers to enable
799 and then disable everything else.
800 */
801
802 char *startCur = ciphers13;
803 int algCount = 0;
804 char *nameEnd;
805
806 disable_aes_gcm_sha384 = TRUE;
807 disable_aes_gcm_sha256 = TRUE;
808 disable_chacha_poly = TRUE;
809 disable_aes_ccm_8_sha256 = TRUE;
810 disable_aes_ccm_sha256 = TRUE;
811
812 while(startCur && (0 != *startCur) && (algCount < remaining_ciphers)) {
813 size_t n;
814 char *namep;
815 nameEnd = strchr(startCur, ':');
816 n = nameEnd ? (size_t)(nameEnd - startCur) : strlen(startCur);
817 namep = startCur;
818
819 if(disable_aes_gcm_sha384 &&
820 algo("TLS_AES_256_GCM_SHA384", namep, n)) {
821 disable_aes_gcm_sha384 = FALSE;
822 }
823 else if(disable_aes_gcm_sha256
824 && algo("TLS_AES_128_GCM_SHA256", namep, n)) {
825 disable_aes_gcm_sha256 = FALSE;
826 }
827 else if(disable_chacha_poly
828 && algo("TLS_CHACHA20_POLY1305_SHA256", namep, n)) {
829 disable_chacha_poly = FALSE;
830 }
831 else if(disable_aes_ccm_8_sha256
832 && algo("TLS_AES_128_CCM_8_SHA256", namep, n)) {
833 disable_aes_ccm_8_sha256 = FALSE;
834 }
835 else if(disable_aes_ccm_sha256
836 && algo("TLS_AES_128_CCM_SHA256", namep, n)) {
837 disable_aes_ccm_sha256 = FALSE;
838 }
839 else {
840 failf(data, "schannel: Unknown TLS 1.3 cipher: %.*s", (int)n, namep);
841 return CURLE_SSL_CIPHER;
842 }
843
844 startCur = nameEnd;
845 if(startCur)
846 startCur++;
847
848 algCount++;
849 }
850 }
851
852 if(disable_aes_gcm_sha384 && disable_aes_gcm_sha256
853 && disable_chacha_poly && disable_aes_ccm_8_sha256
854 && disable_aes_ccm_sha256) {
855 failf(data, "schannel: All available TLS 1.3 ciphers were disabled");
856 return CURLE_SSL_CIPHER;
857 }
858
859 /* Disable TLS_AES_128_CCM_8_SHA256 and/or TLS_AES_128_CCM_SHA256 */
860 if(disable_aes_ccm_8_sha256 || disable_aes_ccm_sha256) {
861 /*
862 Disallow AES_CCM algorithm.
863 */
864 blocked_ccm_modes[0].Length = sizeof(BCRYPT_CHAIN_MODE_CCM);
865 blocked_ccm_modes[0].MaximumLength = sizeof(BCRYPT_CHAIN_MODE_CCM);
866 blocked_ccm_modes[0].Buffer = (PWSTR)BCRYPT_CHAIN_MODE_CCM;
867
868 crypto_settings[crypto_settings_idx].eAlgorithmUsage =
869 TlsParametersCngAlgUsageCipher;
870 crypto_settings[crypto_settings_idx].rgstrChainingModes =
871 blocked_ccm_modes;
872 crypto_settings[crypto_settings_idx].cChainingModes =
873 ARRAYSIZE(blocked_ccm_modes);
874 crypto_settings[crypto_settings_idx].strCngAlgId.Length =
875 sizeof(BCRYPT_AES_ALGORITHM);
876 crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
877 sizeof(BCRYPT_AES_ALGORITHM);
878 crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
879 (PWSTR)BCRYPT_AES_ALGORITHM;
880
881 /* only disabling one of the CCM modes */
882 if(disable_aes_ccm_8_sha256 != disable_aes_ccm_sha256) {
883 if(disable_aes_ccm_8_sha256)
884 crypto_settings[crypto_settings_idx].dwMinBitLength = 128;
885 else /* disable_aes_ccm_sha256 */
886 crypto_settings[crypto_settings_idx].dwMaxBitLength = 64;
887 }
888
889 crypto_settings_idx++;
890 }
891
892 /* Disable TLS_AES_256_GCM_SHA384 and/or TLS_AES_128_GCM_SHA256 */
893 if(disable_aes_gcm_sha384 || disable_aes_gcm_sha256) {
894
895 /*
896 Disallow AES_GCM algorithm
897 */
898 blocked_gcm_modes[0].Length = sizeof(BCRYPT_CHAIN_MODE_GCM);
899 blocked_gcm_modes[0].MaximumLength = sizeof(BCRYPT_CHAIN_MODE_GCM);
900 blocked_gcm_modes[0].Buffer = (PWSTR)BCRYPT_CHAIN_MODE_GCM;
901
902 /* if only one is disabled, then explicitly disable the
903 digest cipher suite (sha384 or sha256) */
904 if(disable_aes_gcm_sha384 != disable_aes_gcm_sha256) {
905 crypto_settings[crypto_settings_idx].eAlgorithmUsage =
906 TlsParametersCngAlgUsageDigest;
907 crypto_settings[crypto_settings_idx].strCngAlgId.Length =
908 sizeof(disable_aes_gcm_sha384 ?
909 BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
910 crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
911 sizeof(disable_aes_gcm_sha384 ?
912 BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
913 crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
914 (PWSTR)(disable_aes_gcm_sha384 ?
915 BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
916 }
917 else { /* Disable both AES_GCM ciphers */
918 crypto_settings[crypto_settings_idx].eAlgorithmUsage =
919 TlsParametersCngAlgUsageCipher;
920 crypto_settings[crypto_settings_idx].strCngAlgId.Length =
921 sizeof(BCRYPT_AES_ALGORITHM);
922 crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
923 sizeof(BCRYPT_AES_ALGORITHM);
924 crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
925 (PWSTR)BCRYPT_AES_ALGORITHM;
926 }
927
928 crypto_settings[crypto_settings_idx].rgstrChainingModes =
929 blocked_gcm_modes;
930 crypto_settings[crypto_settings_idx].cChainingModes = 1;
931
932 crypto_settings_idx++;
933 }
934
935 /*
936 Disable ChaCha20-Poly1305.
937 */
938 if(disable_chacha_poly) {
939 crypto_settings[crypto_settings_idx].eAlgorithmUsage =
940 TlsParametersCngAlgUsageCipher;
941 crypto_settings[crypto_settings_idx].strCngAlgId.Length =
942 sizeof(BCRYPT_CHACHA20_POLY1305_ALGORITHM);
943 crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
944 sizeof(BCRYPT_CHACHA20_POLY1305_ALGORITHM);
945 crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
946 (PWSTR)BCRYPT_CHACHA20_POLY1305_ALGORITHM;
947 crypto_settings_idx++;
948 }
949
950 tls_parameters.pDisabledCrypto = crypto_settings;
951
952 /* The number of blocked suites */
953 tls_parameters.cDisabledCrypto = (DWORD)crypto_settings_idx;
954 credentials.pTlsParameters = &tls_parameters;
955 credentials.cTlsParameters = 1;
956
957 credentials.dwVersion = SCH_CREDENTIALS_VERSION;
958 credentials.dwFlags = flags | SCH_USE_STRONG_CRYPTO;
959
960 credentials.pTlsParameters->grbitDisabledProtocols =
961 (DWORD)~enabled_protocols;
962
963 #ifdef HAS_CLIENT_CERT_PATH
964 if(client_certs[0]) {
965 credentials.cCreds = 1;
966 credentials.paCred = client_certs;
967 }
968 #endif
969
970 sspi_status =
971 Curl_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR*)UNISP_NAME,
972 SECPKG_CRED_OUTBOUND, NULL,
973 &credentials, NULL, NULL,
974 &backend->cred->cred_handle,
975 &backend->cred->time_stamp);
976 }
977 else {
978 /* Pre-Windows 10 1809 or the user set a legacy algorithm list. Although MS
979 does not document it, currently Schannel will not negotiate TLS 1.3 when
980 SCHANNEL_CRED is used. */
981 ALG_ID algIds[NUM_CIPHERS];
982 char *ciphers = conn_config->cipher_list;
983 SCHANNEL_CRED schannel_cred = { 0 };
984 schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
985 schannel_cred.dwFlags = flags;
986 schannel_cred.grbitEnabledProtocols = enabled_protocols;
987
988 if(ciphers) {
989 if((enabled_protocols & SP_PROT_TLS1_3_CLIENT)) {
990 infof(data, "schannel: WARNING: This version of Schannel may "
991 "negotiate a less-secure TLS version than TLS 1.3 because the "
992 "user set an algorithm cipher list.");
993 }
994 if(conn_config->cipher_list13) {
995 failf(data, "schannel: This version of Schannel does not support "
996 "setting an algorithm cipher list and TLS 1.3 cipher list at "
997 "the same time");
998 return CURLE_SSL_CIPHER;
999 }
1000 result = set_ssl_ciphers(&schannel_cred, ciphers, algIds);
1001 if(CURLE_OK != result) {
1002 failf(data, "schannel: Failed setting algorithm cipher list");
1003 return result;
1004 }
1005 }
1006 else {
1007 schannel_cred.dwFlags = flags | SCH_USE_STRONG_CRYPTO;
1008 }
1009
1010 #ifdef HAS_CLIENT_CERT_PATH
1011 if(client_certs[0]) {
1012 schannel_cred.cCreds = 1;
1013 schannel_cred.paCred = client_certs;
1014 }
1015 #endif
1016
1017 sspi_status =
1018 Curl_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR*)UNISP_NAME,
1019 SECPKG_CRED_OUTBOUND, NULL,
1020 &schannel_cred, NULL, NULL,
1021 &backend->cred->cred_handle,
1022 &backend->cred->time_stamp);
1023 }
1024
1025 #ifdef HAS_CLIENT_CERT_PATH
1026 if(client_certs[0])
1027 CertFreeCertificateContext(client_certs[0]);
1028 #endif
1029
1030 if(sspi_status != SEC_E_OK) {
1031 char buffer[STRERROR_LEN];
1032 failf(data, "schannel: AcquireCredentialsHandle failed: %s",
1033 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1034 Curl_safefree(backend->cred);
1035 switch(sspi_status) {
1036 case SEC_E_INSUFFICIENT_MEMORY:
1037 return CURLE_OUT_OF_MEMORY;
1038 case SEC_E_NO_CREDENTIALS:
1039 case SEC_E_SECPKG_NOT_FOUND:
1040 case SEC_E_NOT_OWNER:
1041 case SEC_E_UNKNOWN_CREDENTIALS:
1042 case SEC_E_INTERNAL_ERROR:
1043 default:
1044 return CURLE_SSL_CONNECT_ERROR;
1045 }
1046 }
1047
1048 return CURLE_OK;
1049 }
1050
1051 static CURLcode
schannel_connect_step1(struct Curl_cfilter * cf,struct Curl_easy * data)1052 schannel_connect_step1(struct Curl_cfilter *cf, struct Curl_easy *data)
1053 {
1054 ssize_t written = -1;
1055 struct ssl_connect_data *connssl = cf->ctx;
1056 struct schannel_ssl_backend_data *backend =
1057 (struct schannel_ssl_backend_data *)connssl->backend;
1058 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
1059 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
1060 SecBuffer outbuf;
1061 SecBufferDesc outbuf_desc;
1062 SecBuffer inbuf;
1063 SecBufferDesc inbuf_desc;
1064 #ifdef HAS_ALPN
1065 unsigned char alpn_buffer[128];
1066 #endif
1067 SECURITY_STATUS sspi_status = SEC_E_OK;
1068 struct Curl_schannel_cred *old_cred = NULL;
1069 CURLcode result;
1070
1071 DEBUGASSERT(backend);
1072 DEBUGF(infof(data,
1073 "schannel: SSL/TLS connection with %s port %d (step 1/3)",
1074 connssl->peer.hostname, connssl->peer.port));
1075
1076 if(curlx_verify_windows_version(5, 1, 0, PLATFORM_WINNT,
1077 VERSION_LESS_THAN_EQUAL)) {
1078 /* Schannel in Windows XP (OS version 5.1) uses legacy handshakes and
1079 algorithms that may not be supported by all servers. */
1080 infof(data, "schannel: Windows version is old and may not be able to "
1081 "connect to some servers due to lack of SNI, algorithms, etc.");
1082 }
1083
1084 #ifdef HAS_ALPN
1085 /* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above.
1086 Also it does not seem to be supported for WINE, see curl bug #983. */
1087 backend->use_alpn = connssl->alpn &&
1088 !GetProcAddress(GetModuleHandle(TEXT("ntdll")),
1089 "wine_get_version") &&
1090 curlx_verify_windows_version(6, 3, 0, PLATFORM_WINNT,
1091 VERSION_GREATER_THAN_EQUAL);
1092 #else
1093 backend->use_alpn = false;
1094 #endif
1095
1096 #ifdef _WIN32_WCE
1097 #ifdef HAS_MANUAL_VERIFY_API
1098 /* certificate validation on CE does not seem to work right; we will
1099 * do it following a more manual process. */
1100 backend->use_manual_cred_validation = true;
1101 #else
1102 #error "compiler too old to support Windows CE requisite manual cert verify"
1103 #endif
1104 #else
1105 #ifdef HAS_MANUAL_VERIFY_API
1106 if(conn_config->CAfile || conn_config->ca_info_blob) {
1107 if(curlx_verify_windows_version(6, 1, 0, PLATFORM_WINNT,
1108 VERSION_GREATER_THAN_EQUAL)) {
1109 backend->use_manual_cred_validation = true;
1110 }
1111 else {
1112 failf(data, "schannel: this version of Windows is too old to support "
1113 "certificate verification via CA bundle file.");
1114 return CURLE_SSL_CACERT_BADFILE;
1115 }
1116 }
1117 else
1118 backend->use_manual_cred_validation = false;
1119 #else
1120 if(conn_config->CAfile || conn_config->ca_info_blob) {
1121 failf(data, "schannel: CA cert support not built in");
1122 return CURLE_NOT_BUILT_IN;
1123 }
1124 #endif
1125 #endif
1126
1127 backend->cred = NULL;
1128
1129 /* check for an existing reusable credential handle */
1130 if(ssl_config->primary.cache_session) {
1131 Curl_ssl_sessionid_lock(data);
1132 if(!Curl_ssl_getsessionid(cf, data, &connssl->peer,
1133 (void **)&old_cred, NULL)) {
1134 backend->cred = old_cred;
1135 DEBUGF(infof(data, "schannel: reusing existing credential handle"));
1136
1137 /* increment the reference counter of the credential/session handle */
1138 backend->cred->refcount++;
1139 DEBUGF(infof(data,
1140 "schannel: incremented credential handle refcount = %d",
1141 backend->cred->refcount));
1142 }
1143 Curl_ssl_sessionid_unlock(data);
1144 }
1145
1146 if(!backend->cred) {
1147 char *snihost;
1148 result = schannel_acquire_credential_handle(cf, data);
1149 if(result)
1150 return result;
1151 /* schannel_acquire_credential_handle() sets backend->cred accordingly or
1152 it returns error otherwise. */
1153
1154 /* A hostname associated with the credential is needed by
1155 InitializeSecurityContext for SNI and other reasons. */
1156 snihost = connssl->peer.sni ? connssl->peer.sni : connssl->peer.hostname;
1157 backend->cred->sni_hostname = curlx_convert_UTF8_to_tchar(snihost);
1158 if(!backend->cred->sni_hostname)
1159 return CURLE_OUT_OF_MEMORY;
1160 }
1161
1162 /* Warn if SNI is disabled due to use of an IP address */
1163 if(connssl->peer.type != CURL_SSL_PEER_DNS) {
1164 infof(data, "schannel: using IP address, SNI is not supported by OS.");
1165 }
1166
1167 #ifdef HAS_ALPN
1168 if(backend->use_alpn) {
1169 int cur = 0;
1170 int list_start_index = 0;
1171 unsigned int *extension_len = NULL;
1172 unsigned short* list_len = NULL;
1173 struct alpn_proto_buf proto;
1174
1175 /* The first four bytes will be an unsigned int indicating number
1176 of bytes of data in the rest of the buffer. */
1177 extension_len = (unsigned int *)(void *)(&alpn_buffer[cur]);
1178 cur += (int)sizeof(unsigned int);
1179
1180 /* The next four bytes are an indicator that this buffer will contain
1181 ALPN data, as opposed to NPN, for example. */
1182 *(unsigned int *)(void *)&alpn_buffer[cur] =
1183 SecApplicationProtocolNegotiationExt_ALPN;
1184 cur += (int)sizeof(unsigned int);
1185
1186 /* The next two bytes will be an unsigned short indicating the number
1187 of bytes used to list the preferred protocols. */
1188 list_len = (unsigned short*)(void *)(&alpn_buffer[cur]);
1189 cur += (int)sizeof(unsigned short);
1190
1191 list_start_index = cur;
1192
1193 result = Curl_alpn_to_proto_buf(&proto, connssl->alpn);
1194 if(result) {
1195 failf(data, "Error setting ALPN");
1196 return CURLE_SSL_CONNECT_ERROR;
1197 }
1198 memcpy(&alpn_buffer[cur], proto.data, proto.len);
1199 cur += proto.len;
1200
1201 *list_len = curlx_uitous(cur - list_start_index);
1202 *extension_len = (unsigned int)(*list_len +
1203 sizeof(unsigned int) + sizeof(unsigned short));
1204
1205 InitSecBuffer(&inbuf, SECBUFFER_APPLICATION_PROTOCOLS, alpn_buffer, cur);
1206 InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
1207
1208 Curl_alpn_to_proto_str(&proto, connssl->alpn);
1209 infof(data, VTLS_INFOF_ALPN_OFFER_1STR, proto.data);
1210 }
1211 else {
1212 InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
1213 InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
1214 }
1215 #else /* HAS_ALPN */
1216 InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
1217 InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
1218 #endif
1219
1220 /* setup output buffer */
1221 InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
1222 InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
1223
1224 /* security request flags */
1225 backend->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
1226 ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
1227 ISC_REQ_STREAM;
1228
1229 if(!ssl_config->auto_client_cert) {
1230 backend->req_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
1231 }
1232
1233 /* allocate memory for the security context handle */
1234 backend->ctxt = (struct Curl_schannel_ctxt *)
1235 calloc(1, sizeof(struct Curl_schannel_ctxt));
1236 if(!backend->ctxt) {
1237 failf(data, "schannel: unable to allocate memory");
1238 return CURLE_OUT_OF_MEMORY;
1239 }
1240
1241 /* Schannel InitializeSecurityContext:
1242 https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx
1243
1244 At the moment we do not pass inbuf unless we are using ALPN since we only
1245 use it for that, and WINE (for which we currently disable ALPN) is giving
1246 us problems with inbuf regardless. https://github.com/curl/curl/issues/983
1247 */
1248 sspi_status = Curl_pSecFn->InitializeSecurityContext(
1249 &backend->cred->cred_handle, NULL, backend->cred->sni_hostname,
1250 backend->req_flags, 0, 0,
1251 (backend->use_alpn ? &inbuf_desc : NULL),
1252 0, &backend->ctxt->ctxt_handle,
1253 &outbuf_desc, &backend->ret_flags, &backend->ctxt->time_stamp);
1254
1255 if(sspi_status != SEC_I_CONTINUE_NEEDED) {
1256 char buffer[STRERROR_LEN];
1257 Curl_safefree(backend->ctxt);
1258 switch(sspi_status) {
1259 case SEC_E_INSUFFICIENT_MEMORY:
1260 failf(data, "schannel: initial InitializeSecurityContext failed: %s",
1261 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1262 return CURLE_OUT_OF_MEMORY;
1263 case SEC_E_WRONG_PRINCIPAL:
1264 failf(data, "schannel: SNI or certificate check failed: %s",
1265 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1266 return CURLE_PEER_FAILED_VERIFICATION;
1267 /*
1268 case SEC_E_INVALID_HANDLE:
1269 case SEC_E_INVALID_TOKEN:
1270 case SEC_E_LOGON_DENIED:
1271 case SEC_E_TARGET_UNKNOWN:
1272 case SEC_E_NO_AUTHENTICATING_AUTHORITY:
1273 case SEC_E_INTERNAL_ERROR:
1274 case SEC_E_NO_CREDENTIALS:
1275 case SEC_E_UNSUPPORTED_FUNCTION:
1276 case SEC_E_APPLICATION_PROTOCOL_MISMATCH:
1277 */
1278 default:
1279 failf(data, "schannel: initial InitializeSecurityContext failed: %s",
1280 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1281 return CURLE_SSL_CONNECT_ERROR;
1282 }
1283 }
1284
1285 DEBUGF(infof(data, "schannel: sending initial handshake data: "
1286 "sending %lu bytes.", outbuf.cbBuffer));
1287
1288 /* send initial handshake data which is now stored in output buffer */
1289 written = Curl_conn_cf_send(cf->next, data,
1290 outbuf.pvBuffer, outbuf.cbBuffer, FALSE,
1291 &result);
1292 Curl_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
1293 if((result != CURLE_OK) || (outbuf.cbBuffer != (size_t) written)) {
1294 failf(data, "schannel: failed to send initial handshake data: "
1295 "sent %zd of %lu bytes", written, outbuf.cbBuffer);
1296 return CURLE_SSL_CONNECT_ERROR;
1297 }
1298
1299 DEBUGF(infof(data, "schannel: sent initial handshake data: "
1300 "sent %zd bytes", written));
1301
1302 backend->recv_unrecoverable_err = CURLE_OK;
1303 backend->recv_sspi_close_notify = false;
1304 backend->recv_connection_closed = false;
1305 backend->recv_renegotiating = false;
1306 backend->encdata_is_incomplete = false;
1307
1308 /* continue to second handshake step */
1309 connssl->connecting_state = ssl_connect_2;
1310
1311 return CURLE_OK;
1312 }
1313
1314 static CURLcode
schannel_connect_step2(struct Curl_cfilter * cf,struct Curl_easy * data)1315 schannel_connect_step2(struct Curl_cfilter *cf, struct Curl_easy *data)
1316 {
1317 struct ssl_connect_data *connssl = cf->ctx;
1318 struct schannel_ssl_backend_data *backend =
1319 (struct schannel_ssl_backend_data *)connssl->backend;
1320 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
1321 int i;
1322 ssize_t nread = -1, written = -1;
1323 unsigned char *reallocated_buffer;
1324 SecBuffer outbuf[3];
1325 SecBufferDesc outbuf_desc;
1326 SecBuffer inbuf[2];
1327 SecBufferDesc inbuf_desc;
1328 SECURITY_STATUS sspi_status = SEC_E_OK;
1329 CURLcode result;
1330 bool doread;
1331 const char *pubkey_ptr;
1332
1333 DEBUGASSERT(backend);
1334
1335 doread = (connssl->io_need & CURL_SSL_IO_NEED_SEND) ? FALSE : TRUE;
1336 connssl->io_need = CURL_SSL_IO_NEED_NONE;
1337
1338 DEBUGF(infof(data,
1339 "schannel: SSL/TLS connection with %s port %d (step 2/3)",
1340 connssl->peer.hostname, connssl->peer.port));
1341
1342 if(!backend->cred || !backend->ctxt)
1343 return CURLE_SSL_CONNECT_ERROR;
1344
1345 /* buffer to store previously received and decrypted data */
1346 if(!backend->decdata_buffer) {
1347 backend->decdata_offset = 0;
1348 backend->decdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
1349 backend->decdata_buffer = malloc(backend->decdata_length);
1350 if(!backend->decdata_buffer) {
1351 failf(data, "schannel: unable to allocate memory");
1352 return CURLE_OUT_OF_MEMORY;
1353 }
1354 }
1355
1356 /* buffer to store previously received and encrypted data */
1357 if(!backend->encdata_buffer) {
1358 backend->encdata_is_incomplete = false;
1359 backend->encdata_offset = 0;
1360 backend->encdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
1361 backend->encdata_buffer = malloc(backend->encdata_length);
1362 if(!backend->encdata_buffer) {
1363 failf(data, "schannel: unable to allocate memory");
1364 return CURLE_OUT_OF_MEMORY;
1365 }
1366 }
1367
1368 /* if we need a bigger buffer to read a full message, increase buffer now */
1369 if(backend->encdata_length - backend->encdata_offset <
1370 CURL_SCHANNEL_BUFFER_FREE_SIZE) {
1371 /* increase internal encrypted data buffer */
1372 size_t reallocated_length = backend->encdata_offset +
1373 CURL_SCHANNEL_BUFFER_FREE_SIZE;
1374 reallocated_buffer = realloc(backend->encdata_buffer,
1375 reallocated_length);
1376
1377 if(!reallocated_buffer) {
1378 failf(data, "schannel: unable to re-allocate memory");
1379 return CURLE_OUT_OF_MEMORY;
1380 }
1381 else {
1382 backend->encdata_buffer = reallocated_buffer;
1383 backend->encdata_length = reallocated_length;
1384 }
1385 }
1386
1387 for(;;) {
1388 if(doread) {
1389 /* read encrypted handshake data from socket */
1390 nread = Curl_conn_cf_recv(cf->next, data,
1391 (char *) (backend->encdata_buffer +
1392 backend->encdata_offset),
1393 backend->encdata_length -
1394 backend->encdata_offset,
1395 &result);
1396 if(result == CURLE_AGAIN) {
1397 connssl->io_need = CURL_SSL_IO_NEED_RECV;
1398 DEBUGF(infof(data, "schannel: failed to receive handshake, "
1399 "need more data"));
1400 return CURLE_OK;
1401 }
1402 else if((result != CURLE_OK) || (nread == 0)) {
1403 failf(data, "schannel: failed to receive handshake, "
1404 "SSL/TLS connection failed");
1405 return CURLE_SSL_CONNECT_ERROR;
1406 }
1407
1408 /* increase encrypted data buffer offset */
1409 backend->encdata_offset += nread;
1410 backend->encdata_is_incomplete = false;
1411 DEBUGF(infof(data, "schannel: encrypted data got %zd", nread));
1412 }
1413
1414 DEBUGF(infof(data,
1415 "schannel: encrypted data buffer: offset %zu length %zu",
1416 backend->encdata_offset, backend->encdata_length));
1417
1418 /* setup input buffers */
1419 InitSecBuffer(&inbuf[0], SECBUFFER_TOKEN, malloc(backend->encdata_offset),
1420 curlx_uztoul(backend->encdata_offset));
1421 InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
1422 InitSecBufferDesc(&inbuf_desc, inbuf, 2);
1423
1424 /* setup output buffers */
1425 InitSecBuffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
1426 InitSecBuffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
1427 InitSecBuffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0);
1428 InitSecBufferDesc(&outbuf_desc, outbuf, 3);
1429
1430 if(!inbuf[0].pvBuffer) {
1431 failf(data, "schannel: unable to allocate memory");
1432 return CURLE_OUT_OF_MEMORY;
1433 }
1434
1435 /* copy received handshake data into input buffer */
1436 memcpy(inbuf[0].pvBuffer, backend->encdata_buffer,
1437 backend->encdata_offset);
1438
1439 sspi_status = Curl_pSecFn->InitializeSecurityContext(
1440 &backend->cred->cred_handle, &backend->ctxt->ctxt_handle,
1441 backend->cred->sni_hostname, backend->req_flags,
1442 0, 0, &inbuf_desc, 0, NULL,
1443 &outbuf_desc, &backend->ret_flags, &backend->ctxt->time_stamp);
1444
1445 /* free buffer for received handshake data */
1446 Curl_safefree(inbuf[0].pvBuffer);
1447
1448 /* check if the handshake was incomplete */
1449 if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
1450 backend->encdata_is_incomplete = true;
1451 connssl->io_need = CURL_SSL_IO_NEED_RECV;
1452 DEBUGF(infof(data,
1453 "schannel: received incomplete message, need more data"));
1454 return CURLE_OK;
1455 }
1456
1457 /* If the server has requested a client certificate, attempt to continue
1458 the handshake without one. This will allow connections to servers which
1459 request a client certificate but do not require it. */
1460 if(sspi_status == SEC_I_INCOMPLETE_CREDENTIALS &&
1461 !(backend->req_flags & ISC_REQ_USE_SUPPLIED_CREDS)) {
1462 backend->req_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
1463 connssl->io_need = CURL_SSL_IO_NEED_SEND;
1464 DEBUGF(infof(data,
1465 "schannel: a client certificate has been requested"));
1466 return CURLE_OK;
1467 }
1468
1469 /* check if the handshake needs to be continued */
1470 if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
1471 for(i = 0; i < 3; i++) {
1472 /* search for handshake tokens that need to be send */
1473 if(outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
1474 DEBUGF(infof(data, "schannel: sending next handshake data: "
1475 "sending %lu bytes.", outbuf[i].cbBuffer));
1476
1477 /* send handshake token to server */
1478 written = Curl_conn_cf_send(cf->next, data,
1479 outbuf[i].pvBuffer, outbuf[i].cbBuffer,
1480 FALSE, &result);
1481 if((result != CURLE_OK) ||
1482 (outbuf[i].cbBuffer != (size_t) written)) {
1483 failf(data, "schannel: failed to send next handshake data: "
1484 "sent %zd of %lu bytes", written, outbuf[i].cbBuffer);
1485 return CURLE_SSL_CONNECT_ERROR;
1486 }
1487 }
1488
1489 /* free obsolete buffer */
1490 if(outbuf[i].pvBuffer) {
1491 Curl_pSecFn->FreeContextBuffer(outbuf[i].pvBuffer);
1492 }
1493 }
1494 }
1495 else {
1496 char buffer[STRERROR_LEN];
1497 switch(sspi_status) {
1498 case SEC_E_INSUFFICIENT_MEMORY:
1499 failf(data, "schannel: next InitializeSecurityContext failed: %s",
1500 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1501 return CURLE_OUT_OF_MEMORY;
1502 case SEC_E_WRONG_PRINCIPAL:
1503 failf(data, "schannel: SNI or certificate check failed: %s",
1504 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1505 return CURLE_PEER_FAILED_VERIFICATION;
1506 case SEC_E_UNTRUSTED_ROOT:
1507 failf(data, "schannel: %s",
1508 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1509 return CURLE_PEER_FAILED_VERIFICATION;
1510 /*
1511 case SEC_E_INVALID_HANDLE:
1512 case SEC_E_INVALID_TOKEN:
1513 case SEC_E_LOGON_DENIED:
1514 case SEC_E_TARGET_UNKNOWN:
1515 case SEC_E_NO_AUTHENTICATING_AUTHORITY:
1516 case SEC_E_INTERNAL_ERROR:
1517 case SEC_E_NO_CREDENTIALS:
1518 case SEC_E_UNSUPPORTED_FUNCTION:
1519 case SEC_E_APPLICATION_PROTOCOL_MISMATCH:
1520 */
1521 default:
1522 failf(data, "schannel: next InitializeSecurityContext failed: %s",
1523 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
1524 return CURLE_SSL_CONNECT_ERROR;
1525 }
1526 }
1527
1528 /* check if there was additional remaining encrypted data */
1529 if(inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
1530 DEBUGF(infof(data, "schannel: encrypted data length: %lu",
1531 inbuf[1].cbBuffer));
1532 /*
1533 There are two cases where we could be getting extra data here:
1534 1) If we are renegotiating a connection and the handshake is already
1535 complete (from the server perspective), it can encrypted app data
1536 (not handshake data) in an extra buffer at this point.
1537 2) (sspi_status == SEC_I_CONTINUE_NEEDED) We are negotiating a
1538 connection and this extra data is part of the handshake.
1539 We should process the data immediately; waiting for the socket to
1540 be ready may fail since the server is done sending handshake data.
1541 */
1542 /* check if the remaining data is less than the total amount
1543 and therefore begins after the already processed data */
1544 if(backend->encdata_offset > inbuf[1].cbBuffer) {
1545 memmove(backend->encdata_buffer,
1546 (backend->encdata_buffer + backend->encdata_offset) -
1547 inbuf[1].cbBuffer, inbuf[1].cbBuffer);
1548 backend->encdata_offset = inbuf[1].cbBuffer;
1549 if(sspi_status == SEC_I_CONTINUE_NEEDED) {
1550 doread = FALSE;
1551 continue;
1552 }
1553 }
1554 }
1555 else {
1556 backend->encdata_offset = 0;
1557 }
1558 break;
1559 }
1560
1561 /* check if the handshake needs to be continued */
1562 if(sspi_status == SEC_I_CONTINUE_NEEDED) {
1563 connssl->io_need = CURL_SSL_IO_NEED_RECV;
1564 return CURLE_OK;
1565 }
1566
1567 /* check if the handshake is complete */
1568 if(sspi_status == SEC_E_OK) {
1569 connssl->connecting_state = ssl_connect_3;
1570 DEBUGF(infof(data, "schannel: SSL/TLS handshake complete"));
1571 }
1572
1573 #ifndef CURL_DISABLE_PROXY
1574 pubkey_ptr = Curl_ssl_cf_is_proxy(cf) ?
1575 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
1576 data->set.str[STRING_SSL_PINNEDPUBLICKEY];
1577 #else
1578 pubkey_ptr = data->set.str[STRING_SSL_PINNEDPUBLICKEY];
1579 #endif
1580 if(pubkey_ptr) {
1581 result = schannel_pkp_pin_peer_pubkey(cf, data, pubkey_ptr);
1582 if(result) {
1583 failf(data, "SSL: public key does not match pinned public key");
1584 return result;
1585 }
1586 }
1587
1588 #ifdef HAS_MANUAL_VERIFY_API
1589 if(conn_config->verifypeer && backend->use_manual_cred_validation) {
1590 /* Certificate verification also verifies the hostname if verifyhost */
1591 return Curl_verify_certificate(cf, data);
1592 }
1593 #endif
1594
1595 /* Verify the hostname manually when certificate verification is disabled,
1596 because in that case Schannel will not verify it. */
1597 if(!conn_config->verifypeer && conn_config->verifyhost)
1598 return Curl_verify_host(cf, data);
1599
1600 return CURLE_OK;
1601 }
1602
1603 static bool
valid_cert_encoding(const CERT_CONTEXT * cert_context)1604 valid_cert_encoding(const CERT_CONTEXT *cert_context)
1605 {
1606 return (cert_context != NULL) &&
1607 ((cert_context->dwCertEncodingType & X509_ASN_ENCODING) != 0) &&
1608 (cert_context->pbCertEncoded != NULL) &&
1609 (cert_context->cbCertEncoded > 0);
1610 }
1611
1612 typedef bool(*Read_crt_func)(const CERT_CONTEXT *ccert_context,
1613 bool reverse_order, void *arg);
1614
1615 static void
traverse_cert_store(const CERT_CONTEXT * context,Read_crt_func func,void * arg)1616 traverse_cert_store(const CERT_CONTEXT *context, Read_crt_func func,
1617 void *arg)
1618 {
1619 const CERT_CONTEXT *current_context = NULL;
1620 bool should_continue = true;
1621 bool first = true;
1622 bool reverse_order = false;
1623 while(should_continue &&
1624 (current_context = CertEnumCertificatesInStore(
1625 context->hCertStore,
1626 current_context)) != NULL) {
1627 /* Windows 11 22H2 OS Build 22621.674 or higher enumerates certificates in
1628 leaf-to-root order while all previous versions of Windows enumerate
1629 certificates in root-to-leaf order. Determine the order of enumeration
1630 by comparing SECPKG_ATTR_REMOTE_CERT_CONTEXT's pbCertContext with the
1631 first certificate's pbCertContext. */
1632 if(first && context->pbCertEncoded != current_context->pbCertEncoded)
1633 reverse_order = true;
1634 should_continue = func(current_context, reverse_order, arg);
1635 first = false;
1636 }
1637
1638 if(current_context)
1639 CertFreeCertificateContext(current_context);
1640 }
1641
1642 static bool
cert_counter_callback(const CERT_CONTEXT * ccert_context,bool reverse_order,void * certs_count)1643 cert_counter_callback(const CERT_CONTEXT *ccert_context, bool reverse_order,
1644 void *certs_count)
1645 {
1646 (void)reverse_order; /* unused */
1647 if(valid_cert_encoding(ccert_context))
1648 (*(int *)certs_count)++;
1649 return true;
1650 }
1651
1652 struct Adder_args
1653 {
1654 struct Curl_easy *data;
1655 CURLcode result;
1656 int idx;
1657 int certs_count;
1658 };
1659
1660 static bool
add_cert_to_certinfo(const CERT_CONTEXT * ccert_context,bool reverse_order,void * raw_arg)1661 add_cert_to_certinfo(const CERT_CONTEXT *ccert_context, bool reverse_order,
1662 void *raw_arg)
1663 {
1664 struct Adder_args *args = (struct Adder_args*)raw_arg;
1665 args->result = CURLE_OK;
1666 if(valid_cert_encoding(ccert_context)) {
1667 const char *beg = (const char *) ccert_context->pbCertEncoded;
1668 const char *end = beg + ccert_context->cbCertEncoded;
1669 int insert_index = reverse_order ? (args->certs_count - 1) - args->idx :
1670 args->idx;
1671 args->result = Curl_extract_certinfo(args->data, insert_index,
1672 beg, end);
1673 args->idx++;
1674 }
1675 return args->result == CURLE_OK;
1676 }
1677
schannel_session_free(void * sessionid,size_t idsize)1678 static void schannel_session_free(void *sessionid, size_t idsize)
1679 {
1680 /* this is expected to be called under sessionid lock */
1681 struct Curl_schannel_cred *cred = sessionid;
1682
1683 (void)idsize;
1684 if(cred) {
1685 cred->refcount--;
1686 if(cred->refcount == 0) {
1687 Curl_pSecFn->FreeCredentialsHandle(&cred->cred_handle);
1688 curlx_unicodefree(cred->sni_hostname);
1689 #ifdef HAS_CLIENT_CERT_PATH
1690 if(cred->client_cert_store) {
1691 CertCloseStore(cred->client_cert_store, 0);
1692 cred->client_cert_store = NULL;
1693 }
1694 #endif
1695 Curl_safefree(cred);
1696 }
1697 }
1698 }
1699
1700 static CURLcode
schannel_connect_step3(struct Curl_cfilter * cf,struct Curl_easy * data)1701 schannel_connect_step3(struct Curl_cfilter *cf, struct Curl_easy *data)
1702 {
1703 struct ssl_connect_data *connssl = cf->ctx;
1704 struct schannel_ssl_backend_data *backend =
1705 (struct schannel_ssl_backend_data *)connssl->backend;
1706 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
1707 CURLcode result = CURLE_OK;
1708 SECURITY_STATUS sspi_status = SEC_E_OK;
1709 CERT_CONTEXT *ccert_context = NULL;
1710 #ifdef HAS_ALPN
1711 SecPkgContext_ApplicationProtocol alpn_result;
1712 #endif
1713
1714 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
1715 DEBUGASSERT(backend);
1716
1717 DEBUGF(infof(data,
1718 "schannel: SSL/TLS connection with %s port %d (step 3/3)",
1719 connssl->peer.hostname, connssl->peer.port));
1720
1721 if(!backend->cred)
1722 return CURLE_SSL_CONNECT_ERROR;
1723
1724 /* check if the required context attributes are met */
1725 if(backend->ret_flags != backend->req_flags) {
1726 if(!(backend->ret_flags & ISC_RET_SEQUENCE_DETECT))
1727 failf(data, "schannel: failed to setup sequence detection");
1728 if(!(backend->ret_flags & ISC_RET_REPLAY_DETECT))
1729 failf(data, "schannel: failed to setup replay detection");
1730 if(!(backend->ret_flags & ISC_RET_CONFIDENTIALITY))
1731 failf(data, "schannel: failed to setup confidentiality");
1732 if(!(backend->ret_flags & ISC_RET_ALLOCATED_MEMORY))
1733 failf(data, "schannel: failed to setup memory allocation");
1734 if(!(backend->ret_flags & ISC_RET_STREAM))
1735 failf(data, "schannel: failed to setup stream orientation");
1736 return CURLE_SSL_CONNECT_ERROR;
1737 }
1738
1739 #ifdef HAS_ALPN
1740 if(backend->use_alpn) {
1741 sspi_status =
1742 Curl_pSecFn->QueryContextAttributes(&backend->ctxt->ctxt_handle,
1743 SECPKG_ATTR_APPLICATION_PROTOCOL,
1744 &alpn_result);
1745
1746 if(sspi_status != SEC_E_OK) {
1747 failf(data, "schannel: failed to retrieve ALPN result");
1748 return CURLE_SSL_CONNECT_ERROR;
1749 }
1750
1751 if(alpn_result.ProtoNegoStatus ==
1752 SecApplicationProtocolNegotiationStatus_Success) {
1753 unsigned char prev_alpn = cf->conn->alpn;
1754
1755 Curl_alpn_set_negotiated(cf, data, alpn_result.ProtocolId,
1756 alpn_result.ProtocolIdSize);
1757 if(backend->recv_renegotiating) {
1758 if(prev_alpn != cf->conn->alpn &&
1759 prev_alpn != CURL_HTTP_VERSION_NONE) {
1760 /* Renegotiation selected a different protocol now, we cannot
1761 * deal with this */
1762 failf(data, "schannel: server selected an ALPN protocol too late");
1763 return CURLE_SSL_CONNECT_ERROR;
1764 }
1765 }
1766 }
1767 else {
1768 if(!backend->recv_renegotiating)
1769 Curl_alpn_set_negotiated(cf, data, NULL, 0);
1770 }
1771 }
1772 #endif
1773
1774 /* save the current session data for possible reuse */
1775 if(ssl_config->primary.cache_session) {
1776 Curl_ssl_sessionid_lock(data);
1777 /* Up ref count since call takes ownership */
1778 backend->cred->refcount++;
1779 result = Curl_ssl_set_sessionid(cf, data, &connssl->peer, backend->cred,
1780 sizeof(struct Curl_schannel_cred),
1781 schannel_session_free);
1782 Curl_ssl_sessionid_unlock(data);
1783 if(result)
1784 return result;
1785 }
1786
1787 if(data->set.ssl.certinfo) {
1788 int certs_count = 0;
1789 sspi_status =
1790 Curl_pSecFn->QueryContextAttributes(&backend->ctxt->ctxt_handle,
1791 SECPKG_ATTR_REMOTE_CERT_CONTEXT,
1792 &ccert_context);
1793
1794 if((sspi_status != SEC_E_OK) || !ccert_context) {
1795 failf(data, "schannel: failed to retrieve remote cert context");
1796 return CURLE_PEER_FAILED_VERIFICATION;
1797 }
1798
1799 traverse_cert_store(ccert_context, cert_counter_callback, &certs_count);
1800
1801 result = Curl_ssl_init_certinfo(data, certs_count);
1802 if(!result) {
1803 struct Adder_args args;
1804 args.data = data;
1805 args.idx = 0;
1806 args.certs_count = certs_count;
1807 traverse_cert_store(ccert_context, add_cert_to_certinfo, &args);
1808 result = args.result;
1809 }
1810 CertFreeCertificateContext(ccert_context);
1811 if(result)
1812 return result;
1813 }
1814
1815 connssl->connecting_state = ssl_connect_done;
1816
1817 return CURLE_OK;
1818 }
1819
1820 static CURLcode
schannel_connect_common(struct Curl_cfilter * cf,struct Curl_easy * data,bool nonblocking,bool * done)1821 schannel_connect_common(struct Curl_cfilter *cf,
1822 struct Curl_easy *data,
1823 bool nonblocking, bool *done)
1824 {
1825 CURLcode result;
1826 struct ssl_connect_data *connssl = cf->ctx;
1827 curl_socket_t sockfd = Curl_conn_cf_get_socket(cf, data);
1828 timediff_t timeout_ms;
1829 int what;
1830
1831 /* check if the connection has already been established */
1832 if(ssl_connection_complete == connssl->state) {
1833 *done = TRUE;
1834 return CURLE_OK;
1835 }
1836
1837 if(ssl_connect_1 == connssl->connecting_state) {
1838 /* check out how much more time we are allowed */
1839 timeout_ms = Curl_timeleft(data, NULL, TRUE);
1840
1841 if(timeout_ms < 0) {
1842 /* no need to continue if time already is up */
1843 failf(data, "SSL/TLS connection timeout");
1844 return CURLE_OPERATION_TIMEDOUT;
1845 }
1846
1847 result = schannel_connect_step1(cf, data);
1848 if(result)
1849 return result;
1850 }
1851
1852 while(ssl_connect_2 == connssl->connecting_state) {
1853
1854 /* check out how much more time we are allowed */
1855 timeout_ms = Curl_timeleft(data, NULL, TRUE);
1856
1857 if(timeout_ms < 0) {
1858 /* no need to continue if time already is up */
1859 failf(data, "SSL/TLS connection timeout");
1860 return CURLE_OPERATION_TIMEDOUT;
1861 }
1862
1863 /* if ssl is expecting something, check if it is available. */
1864 if(connssl->io_need) {
1865
1866 curl_socket_t writefd = (connssl->io_need & CURL_SSL_IO_NEED_SEND) ?
1867 sockfd : CURL_SOCKET_BAD;
1868 curl_socket_t readfd = (connssl->io_need & CURL_SSL_IO_NEED_RECV) ?
1869 sockfd : CURL_SOCKET_BAD;
1870
1871 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
1872 nonblocking ? 0 : timeout_ms);
1873 if(what < 0) {
1874 /* fatal error */
1875 failf(data, "select/poll on SSL/TLS socket, errno: %d", SOCKERRNO);
1876 return CURLE_SSL_CONNECT_ERROR;
1877 }
1878 else if(0 == what) {
1879 if(nonblocking) {
1880 *done = FALSE;
1881 return CURLE_OK;
1882 }
1883 else {
1884 /* timeout */
1885 failf(data, "SSL/TLS connection timeout");
1886 return CURLE_OPERATION_TIMEDOUT;
1887 }
1888 }
1889 /* socket is readable or writable */
1890 }
1891
1892 /* Run transaction, and return to the caller if it failed or if
1893 * this connection is part of a multi handle and this loop would
1894 * execute again. This permits the owner of a multi handle to
1895 * abort a connection attempt before step2 has completed while
1896 * ensuring that a client using select() or epoll() will always
1897 * have a valid fdset to wait on.
1898 */
1899 result = schannel_connect_step2(cf, data);
1900 if(result || (nonblocking && (ssl_connect_2 == connssl->connecting_state)))
1901 return result;
1902
1903 } /* repeat step2 until all transactions are done. */
1904
1905 if(ssl_connect_3 == connssl->connecting_state) {
1906 result = schannel_connect_step3(cf, data);
1907 if(result)
1908 return result;
1909 }
1910
1911 if(ssl_connect_done == connssl->connecting_state) {
1912 connssl->state = ssl_connection_complete;
1913
1914 #ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
1915 /* When SSPI is used in combination with Schannel
1916 * we need the Schannel context to create the Schannel
1917 * binding to pass the IIS extended protection checks.
1918 * Available on Windows 7 or later.
1919 */
1920 {
1921 struct schannel_ssl_backend_data *backend =
1922 (struct schannel_ssl_backend_data *)connssl->backend;
1923 DEBUGASSERT(backend);
1924 cf->conn->sslContext = &backend->ctxt->ctxt_handle;
1925 }
1926 #endif
1927
1928 *done = TRUE;
1929 }
1930 else
1931 *done = FALSE;
1932
1933 /* reset our connection state machine */
1934 connssl->connecting_state = ssl_connect_1;
1935
1936 return CURLE_OK;
1937 }
1938
1939 static ssize_t
schannel_send(struct Curl_cfilter * cf,struct Curl_easy * data,const void * buf,size_t len,CURLcode * err)1940 schannel_send(struct Curl_cfilter *cf, struct Curl_easy *data,
1941 const void *buf, size_t len, CURLcode *err)
1942 {
1943 ssize_t written = -1;
1944 size_t data_len = 0;
1945 unsigned char *ptr = NULL;
1946 struct ssl_connect_data *connssl = cf->ctx;
1947 SecBuffer outbuf[4];
1948 SecBufferDesc outbuf_desc;
1949 SECURITY_STATUS sspi_status = SEC_E_OK;
1950 CURLcode result;
1951 struct schannel_ssl_backend_data *backend =
1952 (struct schannel_ssl_backend_data *)connssl->backend;
1953
1954 DEBUGASSERT(backend);
1955
1956 /* check if the maximum stream sizes were queried */
1957 if(backend->stream_sizes.cbMaximumMessage == 0) {
1958 sspi_status = Curl_pSecFn->QueryContextAttributes(
1959 &backend->ctxt->ctxt_handle,
1960 SECPKG_ATTR_STREAM_SIZES,
1961 &backend->stream_sizes);
1962 if(sspi_status != SEC_E_OK) {
1963 *err = CURLE_SEND_ERROR;
1964 return -1;
1965 }
1966 }
1967
1968 /* check if the buffer is longer than the maximum message length */
1969 if(len > backend->stream_sizes.cbMaximumMessage) {
1970 len = backend->stream_sizes.cbMaximumMessage;
1971 }
1972
1973 /* calculate the complete message length and allocate a buffer for it */
1974 data_len = backend->stream_sizes.cbHeader + len +
1975 backend->stream_sizes.cbTrailer;
1976 ptr = (unsigned char *) malloc(data_len);
1977 if(!ptr) {
1978 *err = CURLE_OUT_OF_MEMORY;
1979 return -1;
1980 }
1981
1982 /* setup output buffers (header, data, trailer, empty) */
1983 InitSecBuffer(&outbuf[0], SECBUFFER_STREAM_HEADER,
1984 ptr, backend->stream_sizes.cbHeader);
1985 InitSecBuffer(&outbuf[1], SECBUFFER_DATA,
1986 ptr + backend->stream_sizes.cbHeader, curlx_uztoul(len));
1987 InitSecBuffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,
1988 ptr + backend->stream_sizes.cbHeader + len,
1989 backend->stream_sizes.cbTrailer);
1990 InitSecBuffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);
1991 InitSecBufferDesc(&outbuf_desc, outbuf, 4);
1992
1993 /* copy data into output buffer */
1994 memcpy(outbuf[1].pvBuffer, buf, len);
1995
1996 /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375390.aspx */
1997 sspi_status = Curl_pSecFn->EncryptMessage(&backend->ctxt->ctxt_handle, 0,
1998 &outbuf_desc, 0);
1999
2000 /* check if the message was encrypted */
2001 if(sspi_status == SEC_E_OK) {
2002 written = 0;
2003
2004 /* send the encrypted message including header, data and trailer */
2005 len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
2006
2007 /*
2008 it is important to send the full message which includes the header,
2009 encrypted payload, and trailer. Until the client receives all the
2010 data a coherent message has not been delivered and the client
2011 cannot read any of it.
2012
2013 If we wanted to buffer the unwritten encrypted bytes, we would
2014 tell the client that all data it has requested to be sent has been
2015 sent. The unwritten encrypted bytes would be the first bytes to
2016 send on the next invocation.
2017 Here's the catch with this - if we tell the client that all the
2018 bytes have been sent, will the client call this method again to
2019 send the buffered data? Looking at who calls this function, it
2020 seems the answer is NO.
2021 */
2022
2023 /* send entire message or fail */
2024 while(len > (size_t)written) {
2025 ssize_t this_write = 0;
2026 int what;
2027 timediff_t timeout_ms = Curl_timeleft(data, NULL, FALSE);
2028 if(timeout_ms < 0) {
2029 /* we already got the timeout */
2030 failf(data, "schannel: timed out sending data "
2031 "(bytes sent: %zd)", written);
2032 *err = CURLE_OPERATION_TIMEDOUT;
2033 written = -1;
2034 break;
2035 }
2036 else if(!timeout_ms)
2037 timeout_ms = TIMEDIFF_T_MAX;
2038 what = SOCKET_WRITABLE(Curl_conn_cf_get_socket(cf, data), timeout_ms);
2039 if(what < 0) {
2040 /* fatal error */
2041 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
2042 *err = CURLE_SEND_ERROR;
2043 written = -1;
2044 break;
2045 }
2046 else if(0 == what) {
2047 failf(data, "schannel: timed out sending data "
2048 "(bytes sent: %zd)", written);
2049 *err = CURLE_OPERATION_TIMEDOUT;
2050 written = -1;
2051 break;
2052 }
2053 /* socket is writable */
2054
2055 this_write = Curl_conn_cf_send(cf->next, data,
2056 ptr + written, len - written,
2057 FALSE, &result);
2058 if(result == CURLE_AGAIN)
2059 continue;
2060 else if(result != CURLE_OK) {
2061 *err = result;
2062 written = -1;
2063 break;
2064 }
2065
2066 written += this_write;
2067 }
2068 }
2069 else if(sspi_status == SEC_E_INSUFFICIENT_MEMORY) {
2070 *err = CURLE_OUT_OF_MEMORY;
2071 }
2072 else{
2073 *err = CURLE_SEND_ERROR;
2074 }
2075
2076 Curl_safefree(ptr);
2077
2078 if(len == (size_t)written)
2079 /* Encrypted message including header, data and trailer entirely sent.
2080 The return value is the number of unencrypted bytes that were sent. */
2081 written = outbuf[1].cbBuffer;
2082
2083 return written;
2084 }
2085
2086 static ssize_t
schannel_recv(struct Curl_cfilter * cf,struct Curl_easy * data,char * buf,size_t len,CURLcode * err)2087 schannel_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
2088 char *buf, size_t len, CURLcode *err)
2089 {
2090 size_t size = 0;
2091 ssize_t nread = -1;
2092 struct ssl_connect_data *connssl = cf->ctx;
2093 unsigned char *reallocated_buffer;
2094 size_t reallocated_length;
2095 bool done = FALSE;
2096 SecBuffer inbuf[4];
2097 SecBufferDesc inbuf_desc;
2098 SECURITY_STATUS sspi_status = SEC_E_OK;
2099 /* we want the length of the encrypted buffer to be at least large enough
2100 that it can hold all the bytes requested and some TLS record overhead. */
2101 size_t min_encdata_length = len + CURL_SCHANNEL_BUFFER_FREE_SIZE;
2102 struct schannel_ssl_backend_data *backend =
2103 (struct schannel_ssl_backend_data *)connssl->backend;
2104
2105 DEBUGASSERT(backend);
2106
2107 /****************************************************************************
2108 * Do not return or set backend->recv_unrecoverable_err unless in the
2109 * cleanup. The pattern for return error is set *err, optional infof, goto
2110 * cleanup.
2111 *
2112 * Our priority is to always return as much decrypted data to the caller as
2113 * possible, even if an error occurs. The state of the decrypted buffer must
2114 * always be valid. Transfer of decrypted data to the caller's buffer is
2115 * handled in the cleanup.
2116 */
2117
2118 DEBUGF(infof(data, "schannel: client wants to read %zu bytes", len));
2119 *err = CURLE_OK;
2120
2121 if(len && len <= backend->decdata_offset) {
2122 infof(data, "schannel: enough decrypted data is already available");
2123 goto cleanup;
2124 }
2125 else if(backend->recv_unrecoverable_err) {
2126 *err = backend->recv_unrecoverable_err;
2127 infof(data, "schannel: an unrecoverable error occurred in a prior call");
2128 goto cleanup;
2129 }
2130 else if(backend->recv_sspi_close_notify) {
2131 /* once a server has indicated shutdown there is no more encrypted data */
2132 infof(data, "schannel: server indicated shutdown in a prior call");
2133 goto cleanup;
2134 }
2135 /* it is debatable what to return when !len. Regardless we cannot return
2136 immediately because there may be data to decrypt (in the case we want to
2137 decrypt all encrypted cached data) so handle !len later in cleanup.
2138 */
2139 else if(len && !backend->recv_connection_closed) {
2140 /* increase enc buffer in order to fit the requested amount of data */
2141 size = backend->encdata_length - backend->encdata_offset;
2142 if(size < CURL_SCHANNEL_BUFFER_FREE_SIZE ||
2143 backend->encdata_length < min_encdata_length) {
2144 reallocated_length = backend->encdata_offset +
2145 CURL_SCHANNEL_BUFFER_FREE_SIZE;
2146 if(reallocated_length < min_encdata_length) {
2147 reallocated_length = min_encdata_length;
2148 }
2149 reallocated_buffer = realloc(backend->encdata_buffer,
2150 reallocated_length);
2151 if(!reallocated_buffer) {
2152 *err = CURLE_OUT_OF_MEMORY;
2153 failf(data, "schannel: unable to re-allocate memory");
2154 goto cleanup;
2155 }
2156
2157 backend->encdata_buffer = reallocated_buffer;
2158 backend->encdata_length = reallocated_length;
2159 size = backend->encdata_length - backend->encdata_offset;
2160 DEBUGF(infof(data, "schannel: encdata_buffer resized %zu",
2161 backend->encdata_length));
2162 }
2163
2164 DEBUGF(infof(data,
2165 "schannel: encrypted data buffer: offset %zu length %zu",
2166 backend->encdata_offset, backend->encdata_length));
2167
2168 /* read encrypted data from socket */
2169 nread = Curl_conn_cf_recv(cf->next, data,
2170 (char *)(backend->encdata_buffer +
2171 backend->encdata_offset),
2172 size, err);
2173 if(*err) {
2174 nread = -1;
2175 if(*err == CURLE_AGAIN)
2176 DEBUGF(infof(data,
2177 "schannel: recv returned CURLE_AGAIN"));
2178 else if(*err == CURLE_RECV_ERROR)
2179 infof(data, "schannel: recv returned CURLE_RECV_ERROR");
2180 else
2181 infof(data, "schannel: recv returned error %d", *err);
2182 }
2183 else if(nread == 0) {
2184 backend->recv_connection_closed = true;
2185 DEBUGF(infof(data, "schannel: server closed the connection"));
2186 }
2187 else if(nread > 0) {
2188 backend->encdata_offset += (size_t)nread;
2189 backend->encdata_is_incomplete = false;
2190 DEBUGF(infof(data, "schannel: encrypted data got %zd", nread));
2191 }
2192 }
2193
2194 DEBUGF(infof(data,
2195 "schannel: encrypted data buffer: offset %zu length %zu",
2196 backend->encdata_offset, backend->encdata_length));
2197
2198 /* decrypt loop */
2199 while(backend->encdata_offset > 0 && sspi_status == SEC_E_OK &&
2200 (!len || backend->decdata_offset < len ||
2201 backend->recv_connection_closed)) {
2202 /* prepare data buffer for DecryptMessage call */
2203 InitSecBuffer(&inbuf[0], SECBUFFER_DATA, backend->encdata_buffer,
2204 curlx_uztoul(backend->encdata_offset));
2205
2206 /* we need 3 more empty input buffers for possible output */
2207 InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
2208 InitSecBuffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);
2209 InitSecBuffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);
2210 InitSecBufferDesc(&inbuf_desc, inbuf, 4);
2211
2212 /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375348.aspx
2213 */
2214 sspi_status = Curl_pSecFn->DecryptMessage(&backend->ctxt->ctxt_handle,
2215 &inbuf_desc, 0, NULL);
2216
2217 /* check if everything went fine (server may want to renegotiate
2218 or shutdown the connection context) */
2219 if(sspi_status == SEC_E_OK || sspi_status == SEC_I_RENEGOTIATE ||
2220 sspi_status == SEC_I_CONTEXT_EXPIRED) {
2221 /* check for successfully decrypted data, even before actual
2222 renegotiation or shutdown of the connection context */
2223 if(inbuf[1].BufferType == SECBUFFER_DATA) {
2224 DEBUGF(infof(data, "schannel: decrypted data length: %lu",
2225 inbuf[1].cbBuffer));
2226
2227 /* increase buffer in order to fit the received amount of data */
2228 size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_FREE_SIZE ?
2229 inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_FREE_SIZE;
2230 if(backend->decdata_length - backend->decdata_offset < size ||
2231 backend->decdata_length < len) {
2232 /* increase internal decrypted data buffer */
2233 reallocated_length = backend->decdata_offset + size;
2234 /* make sure that the requested amount of data fits */
2235 if(reallocated_length < len) {
2236 reallocated_length = len;
2237 }
2238 reallocated_buffer = realloc(backend->decdata_buffer,
2239 reallocated_length);
2240 if(!reallocated_buffer) {
2241 *err = CURLE_OUT_OF_MEMORY;
2242 failf(data, "schannel: unable to re-allocate memory");
2243 goto cleanup;
2244 }
2245 backend->decdata_buffer = reallocated_buffer;
2246 backend->decdata_length = reallocated_length;
2247 }
2248
2249 /* copy decrypted data to internal buffer */
2250 size = inbuf[1].cbBuffer;
2251 if(size) {
2252 memcpy(backend->decdata_buffer + backend->decdata_offset,
2253 inbuf[1].pvBuffer, size);
2254 backend->decdata_offset += size;
2255 }
2256
2257 DEBUGF(infof(data, "schannel: decrypted data added: %zu", size));
2258 DEBUGF(infof(data,
2259 "schannel: decrypted cached: offset %zu length %zu",
2260 backend->decdata_offset, backend->decdata_length));
2261 }
2262
2263 /* check for remaining encrypted data */
2264 if(inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
2265 DEBUGF(infof(data, "schannel: encrypted data length: %lu",
2266 inbuf[3].cbBuffer));
2267
2268 /* check if the remaining data is less than the total amount
2269 * and therefore begins after the already processed data
2270 */
2271 if(backend->encdata_offset > inbuf[3].cbBuffer) {
2272 /* move remaining encrypted data forward to the beginning of
2273 buffer */
2274 memmove(backend->encdata_buffer,
2275 (backend->encdata_buffer + backend->encdata_offset) -
2276 inbuf[3].cbBuffer, inbuf[3].cbBuffer);
2277 backend->encdata_offset = inbuf[3].cbBuffer;
2278 }
2279
2280 DEBUGF(infof(data,
2281 "schannel: encrypted cached: offset %zu length %zu",
2282 backend->encdata_offset, backend->encdata_length));
2283 }
2284 else {
2285 /* reset encrypted buffer offset, because there is no data remaining */
2286 backend->encdata_offset = 0;
2287 }
2288
2289 /* check if server wants to renegotiate the connection context */
2290 if(sspi_status == SEC_I_RENEGOTIATE) {
2291 infof(data, "schannel: remote party requests renegotiation");
2292 if(*err && *err != CURLE_AGAIN) {
2293 infof(data, "schannel: cannot renegotiate, an error is pending");
2294 goto cleanup;
2295 }
2296
2297 /* begin renegotiation */
2298 infof(data, "schannel: renegotiating SSL/TLS connection");
2299 connssl->state = ssl_connection_negotiating;
2300 connssl->connecting_state = ssl_connect_2;
2301 connssl->io_need = CURL_SSL_IO_NEED_SEND;
2302 backend->recv_renegotiating = true;
2303 *err = schannel_connect_common(cf, data, FALSE, &done);
2304 backend->recv_renegotiating = false;
2305 if(*err) {
2306 infof(data, "schannel: renegotiation failed");
2307 goto cleanup;
2308 }
2309 /* now retry receiving data */
2310 sspi_status = SEC_E_OK;
2311 infof(data, "schannel: SSL/TLS connection renegotiated");
2312 continue;
2313 }
2314 /* check if the server closed the connection */
2315 else if(sspi_status == SEC_I_CONTEXT_EXPIRED) {
2316 /* In Windows 2000 SEC_I_CONTEXT_EXPIRED (close_notify) is not
2317 returned so we have to work around that in cleanup. */
2318 backend->recv_sspi_close_notify = true;
2319 if(!backend->recv_connection_closed)
2320 backend->recv_connection_closed = true;
2321 infof(data,
2322 "schannel: server close notification received (close_notify)");
2323 goto cleanup;
2324 }
2325 }
2326 else if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
2327 backend->encdata_is_incomplete = true;
2328 if(!*err)
2329 *err = CURLE_AGAIN;
2330 infof(data, "schannel: failed to decrypt data, need more data");
2331 goto cleanup;
2332 }
2333 else {
2334 #ifndef CURL_DISABLE_VERBOSE_STRINGS
2335 char buffer[STRERROR_LEN];
2336 infof(data, "schannel: failed to read data from server: %s",
2337 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
2338 #endif
2339 *err = CURLE_RECV_ERROR;
2340 goto cleanup;
2341 }
2342 }
2343
2344 DEBUGF(infof(data,
2345 "schannel: encrypted data buffer: offset %zu length %zu",
2346 backend->encdata_offset, backend->encdata_length));
2347
2348 DEBUGF(infof(data,
2349 "schannel: decrypted data buffer: offset %zu length %zu",
2350 backend->decdata_offset, backend->decdata_length));
2351
2352 cleanup:
2353 /* Warning- there is no guarantee the encdata state is valid at this point */
2354 DEBUGF(infof(data, "schannel: schannel_recv cleanup"));
2355
2356 /* Error if the connection has closed without a close_notify.
2357
2358 The behavior here is a matter of debate. We do not want to be vulnerable
2359 to a truncation attack however there is some browser precedent for
2360 ignoring the close_notify for compatibility reasons.
2361
2362 Additionally, Windows 2000 (v5.0) is a special case since it seems it
2363 does not return close_notify. In that case if the connection was closed we
2364 assume it was graceful (close_notify) since there does not seem to be a
2365 way to tell.
2366 */
2367 if(len && !backend->decdata_offset && backend->recv_connection_closed &&
2368 !backend->recv_sspi_close_notify) {
2369 bool isWin2k = curlx_verify_windows_version(5, 0, 0, PLATFORM_WINNT,
2370 VERSION_EQUAL);
2371
2372 if(isWin2k && sspi_status == SEC_E_OK)
2373 backend->recv_sspi_close_notify = true;
2374 else {
2375 *err = CURLE_RECV_ERROR;
2376 infof(data, "schannel: server closed abruptly (missing close_notify)");
2377 }
2378 }
2379
2380 /* Any error other than CURLE_AGAIN is an unrecoverable error. */
2381 if(*err && *err != CURLE_AGAIN)
2382 backend->recv_unrecoverable_err = *err;
2383
2384 size = len < backend->decdata_offset ? len : backend->decdata_offset;
2385 if(size) {
2386 memcpy(buf, backend->decdata_buffer, size);
2387 memmove(backend->decdata_buffer, backend->decdata_buffer + size,
2388 backend->decdata_offset - size);
2389 backend->decdata_offset -= size;
2390 DEBUGF(infof(data, "schannel: decrypted data returned %zu", size));
2391 DEBUGF(infof(data,
2392 "schannel: decrypted data buffer: offset %zu length %zu",
2393 backend->decdata_offset, backend->decdata_length));
2394 *err = CURLE_OK;
2395 return (ssize_t)size;
2396 }
2397
2398 if(!*err && !backend->recv_connection_closed)
2399 *err = CURLE_AGAIN;
2400
2401 /* it is debatable what to return when !len. We could return whatever error
2402 we got from decryption but instead we override here so the return is
2403 consistent.
2404 */
2405 if(!len)
2406 *err = CURLE_OK;
2407
2408 return *err ? -1 : 0;
2409 }
2410
schannel_connect_nonblocking(struct Curl_cfilter * cf,struct Curl_easy * data,bool * done)2411 static CURLcode schannel_connect_nonblocking(struct Curl_cfilter *cf,
2412 struct Curl_easy *data,
2413 bool *done)
2414 {
2415 return schannel_connect_common(cf, data, TRUE, done);
2416 }
2417
schannel_connect(struct Curl_cfilter * cf,struct Curl_easy * data)2418 static CURLcode schannel_connect(struct Curl_cfilter *cf,
2419 struct Curl_easy *data)
2420 {
2421 CURLcode result;
2422 bool done = FALSE;
2423
2424 result = schannel_connect_common(cf, data, FALSE, &done);
2425 if(result)
2426 return result;
2427
2428 DEBUGASSERT(done);
2429
2430 return CURLE_OK;
2431 }
2432
schannel_data_pending(struct Curl_cfilter * cf,const struct Curl_easy * data)2433 static bool schannel_data_pending(struct Curl_cfilter *cf,
2434 const struct Curl_easy *data)
2435 {
2436 const struct ssl_connect_data *connssl = cf->ctx;
2437 struct schannel_ssl_backend_data *backend =
2438 (struct schannel_ssl_backend_data *)connssl->backend;
2439
2440 (void)data;
2441 DEBUGASSERT(backend);
2442
2443 if(backend->ctxt) /* SSL/TLS is in use */
2444 return (backend->decdata_offset > 0 ||
2445 (backend->encdata_offset > 0 && !backend->encdata_is_incomplete) ||
2446 backend->recv_connection_closed ||
2447 backend->recv_sspi_close_notify ||
2448 backend->recv_unrecoverable_err);
2449 else
2450 return FALSE;
2451 }
2452
2453 /* shut down the SSL connection and clean up related memory.
2454 this function can be called multiple times on the same connection including
2455 if the SSL connection failed (eg connection made but failed handshake). */
schannel_shutdown(struct Curl_cfilter * cf,struct Curl_easy * data,bool send_shutdown,bool * done)2456 static CURLcode schannel_shutdown(struct Curl_cfilter *cf,
2457 struct Curl_easy *data,
2458 bool send_shutdown, bool *done)
2459 {
2460 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/aa380138.aspx
2461 * Shutting Down an Schannel Connection
2462 */
2463 struct ssl_connect_data *connssl = cf->ctx;
2464 struct schannel_ssl_backend_data *backend =
2465 (struct schannel_ssl_backend_data *)connssl->backend;
2466 CURLcode result = CURLE_OK;
2467
2468 if(cf->shutdown) {
2469 *done = TRUE;
2470 return CURLE_OK;
2471 }
2472
2473 DEBUGASSERT(data);
2474 DEBUGASSERT(backend);
2475
2476 /* Not supported in schannel */
2477 (void)send_shutdown;
2478
2479 *done = FALSE;
2480 if(backend->ctxt) {
2481 infof(data, "schannel: shutting down SSL/TLS connection with %s port %d",
2482 connssl->peer.hostname, connssl->peer.port);
2483 }
2484
2485 if(!backend->ctxt || cf->shutdown) {
2486 *done = TRUE;
2487 goto out;
2488 }
2489
2490 if(backend->cred && backend->ctxt && !backend->sent_shutdown) {
2491 SecBufferDesc BuffDesc;
2492 SecBuffer Buffer;
2493 SECURITY_STATUS sspi_status;
2494 SecBuffer outbuf;
2495 SecBufferDesc outbuf_desc;
2496 DWORD dwshut = SCHANNEL_SHUTDOWN;
2497
2498 InitSecBuffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
2499 InitSecBufferDesc(&BuffDesc, &Buffer, 1);
2500
2501 sspi_status = Curl_pSecFn->ApplyControlToken(&backend->ctxt->ctxt_handle,
2502 &BuffDesc);
2503
2504 if(sspi_status != SEC_E_OK) {
2505 char buffer[STRERROR_LEN];
2506 failf(data, "schannel: ApplyControlToken failure: %s",
2507 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
2508 result = CURLE_SEND_ERROR;
2509 goto out;
2510 }
2511
2512 /* setup output buffer */
2513 InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
2514 InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
2515
2516 sspi_status = Curl_pSecFn->InitializeSecurityContext(
2517 &backend->cred->cred_handle,
2518 &backend->ctxt->ctxt_handle,
2519 backend->cred->sni_hostname,
2520 backend->req_flags,
2521 0,
2522 0,
2523 NULL,
2524 0,
2525 &backend->ctxt->ctxt_handle,
2526 &outbuf_desc,
2527 &backend->ret_flags,
2528 &backend->ctxt->time_stamp);
2529
2530 if((sspi_status == SEC_E_OK) || (sspi_status == SEC_I_CONTEXT_EXPIRED)) {
2531 /* send close message which is in output buffer */
2532 ssize_t written = Curl_conn_cf_send(cf->next, data,
2533 outbuf.pvBuffer, outbuf.cbBuffer,
2534 FALSE, &result);
2535 Curl_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
2536 if(!result) {
2537 if(written < (ssize_t)outbuf.cbBuffer) {
2538 /* TODO: handle partial sends */
2539 infof(data, "schannel: failed to send close msg: %s"
2540 " (bytes written: %zd)", curl_easy_strerror(result), written);
2541 result = CURLE_SEND_ERROR;
2542 goto out;
2543 }
2544 backend->sent_shutdown = TRUE;
2545 *done = TRUE;
2546 }
2547 else if(result == CURLE_AGAIN) {
2548 connssl->io_need = CURL_SSL_IO_NEED_SEND;
2549 result = CURLE_OK;
2550 goto out;
2551 }
2552 else {
2553 if(!backend->recv_connection_closed) {
2554 infof(data, "schannel: error sending close msg: %d", result);
2555 result = CURLE_SEND_ERROR;
2556 goto out;
2557 }
2558 /* Looks like server already closed the connection.
2559 * An error to send our close notify is not a failure. */
2560 *done = TRUE;
2561 result = CURLE_OK;
2562 }
2563 }
2564 }
2565
2566 /* If the connection seems open and we have not seen the close notify
2567 * from the server yet, try to receive it. */
2568 if(backend->cred && backend->ctxt &&
2569 !backend->recv_sspi_close_notify && !backend->recv_connection_closed) {
2570 char buffer[1024];
2571 ssize_t nread;
2572
2573 nread = schannel_recv(cf, data, buffer, sizeof(buffer), &result);
2574 if(nread > 0) {
2575 /* still data coming in? */
2576 }
2577 else if(nread == 0) {
2578 /* We got the close notify alert and are done. */
2579 backend->recv_connection_closed = TRUE;
2580 *done = TRUE;
2581 }
2582 else if(nread < 0 && result == CURLE_AGAIN) {
2583 connssl->io_need = CURL_SSL_IO_NEED_RECV;
2584 }
2585 else {
2586 CURL_TRC_CF(data, cf, "SSL shutdown, error %d", result);
2587 result = CURLE_RECV_ERROR;
2588 }
2589 }
2590
2591 out:
2592 cf->shutdown = (result || *done);
2593 return result;
2594 }
2595
schannel_close(struct Curl_cfilter * cf,struct Curl_easy * data)2596 static void schannel_close(struct Curl_cfilter *cf, struct Curl_easy *data)
2597 {
2598 struct ssl_connect_data *connssl = cf->ctx;
2599 struct schannel_ssl_backend_data *backend =
2600 (struct schannel_ssl_backend_data *)connssl->backend;
2601
2602 DEBUGASSERT(data);
2603 DEBUGASSERT(backend);
2604
2605 /* free SSPI Schannel API security context handle */
2606 if(backend->ctxt) {
2607 DEBUGF(infof(data, "schannel: clear security context handle"));
2608 Curl_pSecFn->DeleteSecurityContext(&backend->ctxt->ctxt_handle);
2609 Curl_safefree(backend->ctxt);
2610 }
2611
2612 /* free SSPI Schannel API credential handle */
2613 if(backend->cred) {
2614 Curl_ssl_sessionid_lock(data);
2615 schannel_session_free(backend->cred, 0);
2616 Curl_ssl_sessionid_unlock(data);
2617 backend->cred = NULL;
2618 }
2619
2620 /* free internal buffer for received encrypted data */
2621 if(backend->encdata_buffer) {
2622 Curl_safefree(backend->encdata_buffer);
2623 backend->encdata_length = 0;
2624 backend->encdata_offset = 0;
2625 backend->encdata_is_incomplete = false;
2626 }
2627
2628 /* free internal buffer for received decrypted data */
2629 if(backend->decdata_buffer) {
2630 Curl_safefree(backend->decdata_buffer);
2631 backend->decdata_length = 0;
2632 backend->decdata_offset = 0;
2633 }
2634 }
2635
schannel_init(void)2636 static int schannel_init(void)
2637 {
2638 return (Curl_sspi_global_init() == CURLE_OK ? 1 : 0);
2639 }
2640
schannel_cleanup(void)2641 static void schannel_cleanup(void)
2642 {
2643 Curl_sspi_global_cleanup();
2644 }
2645
schannel_version(char * buffer,size_t size)2646 static size_t schannel_version(char *buffer, size_t size)
2647 {
2648 return msnprintf(buffer, size, "Schannel");
2649 }
2650
schannel_random(struct Curl_easy * data UNUSED_PARAM,unsigned char * entropy,size_t length)2651 static CURLcode schannel_random(struct Curl_easy *data UNUSED_PARAM,
2652 unsigned char *entropy, size_t length)
2653 {
2654 (void)data;
2655
2656 return Curl_win32_random(entropy, length);
2657 }
2658
schannel_pkp_pin_peer_pubkey(struct Curl_cfilter * cf,struct Curl_easy * data,const char * pinnedpubkey)2659 static CURLcode schannel_pkp_pin_peer_pubkey(struct Curl_cfilter *cf,
2660 struct Curl_easy *data,
2661 const char *pinnedpubkey)
2662 {
2663 struct ssl_connect_data *connssl = cf->ctx;
2664 struct schannel_ssl_backend_data *backend =
2665 (struct schannel_ssl_backend_data *)connssl->backend;
2666 CERT_CONTEXT *pCertContextServer = NULL;
2667
2668 /* Result is returned to caller */
2669 CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
2670
2671 DEBUGASSERT(backend);
2672
2673 /* if a path was not specified, do not pin */
2674 if(!pinnedpubkey)
2675 return CURLE_OK;
2676
2677 do {
2678 SECURITY_STATUS sspi_status;
2679 const char *x509_der;
2680 DWORD x509_der_len;
2681 struct Curl_X509certificate x509_parsed;
2682 struct Curl_asn1Element *pubkey;
2683
2684 sspi_status =
2685 Curl_pSecFn->QueryContextAttributes(&backend->ctxt->ctxt_handle,
2686 SECPKG_ATTR_REMOTE_CERT_CONTEXT,
2687 &pCertContextServer);
2688
2689 if((sspi_status != SEC_E_OK) || !pCertContextServer) {
2690 char buffer[STRERROR_LEN];
2691 failf(data, "schannel: Failed to read remote certificate context: %s",
2692 Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
2693 break; /* failed */
2694 }
2695
2696
2697 if(!(((pCertContextServer->dwCertEncodingType & X509_ASN_ENCODING) != 0) &&
2698 (pCertContextServer->cbCertEncoded > 0)))
2699 break;
2700
2701 x509_der = (const char *)pCertContextServer->pbCertEncoded;
2702 x509_der_len = pCertContextServer->cbCertEncoded;
2703 memset(&x509_parsed, 0, sizeof(x509_parsed));
2704 if(Curl_parseX509(&x509_parsed, x509_der, x509_der + x509_der_len))
2705 break;
2706
2707 pubkey = &x509_parsed.subjectPublicKeyInfo;
2708 if(!pubkey->header || pubkey->end <= pubkey->header) {
2709 failf(data, "SSL: failed retrieving public key from server certificate");
2710 break;
2711 }
2712
2713 result = Curl_pin_peer_pubkey(data,
2714 pinnedpubkey,
2715 (const unsigned char *)pubkey->header,
2716 (size_t)(pubkey->end - pubkey->header));
2717 if(result) {
2718 failf(data, "SSL: public key does not match pinned public key");
2719 }
2720 } while(0);
2721
2722 if(pCertContextServer)
2723 CertFreeCertificateContext(pCertContextServer);
2724
2725 return result;
2726 }
2727
schannel_checksum(const unsigned char * input,size_t inputlen,unsigned char * checksum,size_t checksumlen,DWORD provType,const unsigned int algId)2728 static void schannel_checksum(const unsigned char *input,
2729 size_t inputlen,
2730 unsigned char *checksum,
2731 size_t checksumlen,
2732 DWORD provType,
2733 const unsigned int algId)
2734 {
2735 #ifdef CURL_WINDOWS_UWP
2736 (void)input;
2737 (void)inputlen;
2738 (void)provType;
2739 (void)algId;
2740 memset(checksum, 0, checksumlen);
2741 #else
2742 HCRYPTPROV hProv = 0;
2743 HCRYPTHASH hHash = 0;
2744 DWORD cbHashSize = 0;
2745 DWORD dwHashSizeLen = (DWORD)sizeof(cbHashSize);
2746 DWORD dwChecksumLen = (DWORD)checksumlen;
2747
2748 /* since this can fail in multiple ways, zero memory first so we never
2749 * return old data
2750 */
2751 memset(checksum, 0, checksumlen);
2752
2753 if(!CryptAcquireContext(&hProv, NULL, NULL, provType,
2754 CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
2755 return; /* failed */
2756
2757 do {
2758 if(!CryptCreateHash(hProv, algId, 0, 0, &hHash))
2759 break; /* failed */
2760
2761 if(!CryptHashData(hHash, input, (DWORD)inputlen, 0))
2762 break; /* failed */
2763
2764 /* get hash size */
2765 if(!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&cbHashSize,
2766 &dwHashSizeLen, 0))
2767 break; /* failed */
2768
2769 /* check hash size */
2770 if(checksumlen < cbHashSize)
2771 break; /* failed */
2772
2773 if(CryptGetHashParam(hHash, HP_HASHVAL, checksum, &dwChecksumLen, 0))
2774 break; /* failed */
2775 } while(0);
2776
2777 if(hHash)
2778 CryptDestroyHash(hHash);
2779
2780 if(hProv)
2781 CryptReleaseContext(hProv, 0);
2782 #endif
2783 }
2784
schannel_sha256sum(const unsigned char * input,size_t inputlen,unsigned char * sha256sum,size_t sha256len)2785 static CURLcode schannel_sha256sum(const unsigned char *input,
2786 size_t inputlen,
2787 unsigned char *sha256sum,
2788 size_t sha256len)
2789 {
2790 schannel_checksum(input, inputlen, sha256sum, sha256len,
2791 PROV_RSA_AES, CALG_SHA_256);
2792 return CURLE_OK;
2793 }
2794
schannel_get_internals(struct ssl_connect_data * connssl,CURLINFO info UNUSED_PARAM)2795 static void *schannel_get_internals(struct ssl_connect_data *connssl,
2796 CURLINFO info UNUSED_PARAM)
2797 {
2798 struct schannel_ssl_backend_data *backend =
2799 (struct schannel_ssl_backend_data *)connssl->backend;
2800 (void)info;
2801 DEBUGASSERT(backend);
2802 return &backend->ctxt->ctxt_handle;
2803 }
2804
Curl_schannel_get_cached_cert_store(struct Curl_cfilter * cf,const struct Curl_easy * data)2805 HCERTSTORE Curl_schannel_get_cached_cert_store(struct Curl_cfilter *cf,
2806 const struct Curl_easy *data)
2807 {
2808 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
2809 struct Curl_multi *multi = data->multi;
2810 const struct curl_blob *ca_info_blob = conn_config->ca_info_blob;
2811 struct schannel_cert_share *share;
2812 const struct ssl_general_config *cfg = &data->set.general_ssl;
2813 timediff_t timeout_ms;
2814 timediff_t elapsed_ms;
2815 struct curltime now;
2816 unsigned char info_blob_digest[CURL_SHA256_DIGEST_LENGTH];
2817
2818 DEBUGASSERT(multi);
2819
2820 if(!multi) {
2821 return NULL;
2822 }
2823
2824 share = Curl_hash_pick(&multi->proto_hash,
2825 (void *)MPROTO_SCHANNEL_CERT_SHARE_KEY,
2826 sizeof(MPROTO_SCHANNEL_CERT_SHARE_KEY)-1);
2827 if(!share || !share->cert_store) {
2828 return NULL;
2829 }
2830
2831 /* zero ca_cache_timeout completely disables caching */
2832 if(!cfg->ca_cache_timeout) {
2833 return NULL;
2834 }
2835
2836 /* check for cache timeout by using the cached_x509_store_expired timediff
2837 calculation pattern from openssl.c.
2838 negative timeout means retain forever. */
2839 timeout_ms = cfg->ca_cache_timeout * (timediff_t)1000;
2840 if(timeout_ms >= 0) {
2841 now = Curl_now();
2842 elapsed_ms = Curl_timediff(now, share->time);
2843 if(elapsed_ms >= timeout_ms) {
2844 return NULL;
2845 }
2846 }
2847
2848 if(ca_info_blob) {
2849 if(share->CAinfo_blob_size != ca_info_blob->len) {
2850 return NULL;
2851 }
2852 schannel_sha256sum((const unsigned char *)ca_info_blob->data,
2853 ca_info_blob->len,
2854 info_blob_digest,
2855 CURL_SHA256_DIGEST_LENGTH);
2856 if(memcmp(share->CAinfo_blob_digest, info_blob_digest,
2857 CURL_SHA256_DIGEST_LENGTH)) {
2858 return NULL;
2859 }
2860 }
2861 else {
2862 if(!conn_config->CAfile || !share->CAfile ||
2863 strcmp(share->CAfile, conn_config->CAfile)) {
2864 return NULL;
2865 }
2866 }
2867
2868 return share->cert_store;
2869 }
2870
schannel_cert_share_free(void * key,size_t key_len,void * p)2871 static void schannel_cert_share_free(void *key, size_t key_len, void *p)
2872 {
2873 struct schannel_cert_share *share = p;
2874 DEBUGASSERT(key_len == (sizeof(MPROTO_SCHANNEL_CERT_SHARE_KEY)-1));
2875 DEBUGASSERT(!memcmp(MPROTO_SCHANNEL_CERT_SHARE_KEY, key, key_len));
2876 (void)key;
2877 (void)key_len;
2878 if(share->cert_store) {
2879 CertCloseStore(share->cert_store, 0);
2880 }
2881 free(share->CAfile);
2882 free(share);
2883 }
2884
Curl_schannel_set_cached_cert_store(struct Curl_cfilter * cf,const struct Curl_easy * data,HCERTSTORE cert_store)2885 bool Curl_schannel_set_cached_cert_store(struct Curl_cfilter *cf,
2886 const struct Curl_easy *data,
2887 HCERTSTORE cert_store)
2888 {
2889 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
2890 struct Curl_multi *multi = data->multi;
2891 const struct curl_blob *ca_info_blob = conn_config->ca_info_blob;
2892 struct schannel_cert_share *share;
2893 size_t CAinfo_blob_size = 0;
2894 char *CAfile = NULL;
2895
2896 DEBUGASSERT(multi);
2897
2898 if(!multi) {
2899 return false;
2900 }
2901
2902 share = Curl_hash_pick(&multi->proto_hash,
2903 (void *)MPROTO_SCHANNEL_CERT_SHARE_KEY,
2904 sizeof(MPROTO_SCHANNEL_CERT_SHARE_KEY)-1);
2905 if(!share) {
2906 share = calloc(1, sizeof(*share));
2907 if(!share) {
2908 return false;
2909 }
2910 if(!Curl_hash_add2(&multi->proto_hash,
2911 (void *)MPROTO_SCHANNEL_CERT_SHARE_KEY,
2912 sizeof(MPROTO_SCHANNEL_CERT_SHARE_KEY)-1,
2913 share, schannel_cert_share_free)) {
2914 free(share);
2915 return false;
2916 }
2917 }
2918
2919 if(ca_info_blob) {
2920 schannel_sha256sum((const unsigned char *)ca_info_blob->data,
2921 ca_info_blob->len,
2922 share->CAinfo_blob_digest,
2923 CURL_SHA256_DIGEST_LENGTH);
2924 CAinfo_blob_size = ca_info_blob->len;
2925 }
2926 else {
2927 if(conn_config->CAfile) {
2928 CAfile = strdup(conn_config->CAfile);
2929 if(!CAfile) {
2930 return false;
2931 }
2932 }
2933 }
2934
2935 /* free old cache data */
2936 if(share->cert_store) {
2937 CertCloseStore(share->cert_store, 0);
2938 }
2939 free(share->CAfile);
2940
2941 share->time = Curl_now();
2942 share->cert_store = cert_store;
2943 share->CAinfo_blob_size = CAinfo_blob_size;
2944 share->CAfile = CAfile;
2945 return true;
2946 }
2947
2948 const struct Curl_ssl Curl_ssl_schannel = {
2949 { CURLSSLBACKEND_SCHANNEL, "schannel" }, /* info */
2950
2951 SSLSUPP_CERTINFO |
2952 #ifdef HAS_MANUAL_VERIFY_API
2953 SSLSUPP_CAINFO_BLOB |
2954 #endif
2955 #ifndef CURL_WINDOWS_UWP
2956 SSLSUPP_PINNEDPUBKEY |
2957 #endif
2958 SSLSUPP_TLS13_CIPHERSUITES |
2959 SSLSUPP_CA_CACHE |
2960 SSLSUPP_HTTPS_PROXY |
2961 SSLSUPP_CIPHER_LIST,
2962
2963 sizeof(struct schannel_ssl_backend_data),
2964
2965 schannel_init, /* init */
2966 schannel_cleanup, /* cleanup */
2967 schannel_version, /* version */
2968 Curl_none_check_cxn, /* check_cxn */
2969 schannel_shutdown, /* shutdown */
2970 schannel_data_pending, /* data_pending */
2971 schannel_random, /* random */
2972 Curl_none_cert_status_request, /* cert_status_request */
2973 schannel_connect, /* connect */
2974 schannel_connect_nonblocking, /* connect_nonblocking */
2975 Curl_ssl_adjust_pollset, /* adjust_pollset */
2976 schannel_get_internals, /* get_internals */
2977 schannel_close, /* close_one */
2978 Curl_none_close_all, /* close_all */
2979 Curl_none_set_engine, /* set_engine */
2980 Curl_none_set_engine_default, /* set_engine_default */
2981 Curl_none_engines_list, /* engines_list */
2982 Curl_none_false_start, /* false_start */
2983 schannel_sha256sum, /* sha256sum */
2984 NULL, /* associate_connection */
2985 NULL, /* disassociate_connection */
2986 schannel_recv, /* recv decrypted data */
2987 schannel_send, /* send data to encrypt */
2988 NULL, /* get_channel_binding */
2989 };
2990
2991 #endif /* USE_SCHANNEL */
2992
