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comparison mupdf-source/thirdparty/curl/lib/vtls/vtls.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23 /* This file is for implementing all "generic" SSL functions that all libcurl
24 internals should use. It is then responsible for calling the proper
25 "backend" function.
26
27 SSL-functions in libcurl should call functions in this source file, and not
28 to any specific SSL-layer.
29
30 Curl_ssl_ - prefix for generic ones
31
32 Note that this source code uses the functions of the configured SSL
33 backend via the global Curl_ssl instance.
34
35 "SSL/TLS Strong Encryption: An Introduction"
36 https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html
37 */
38
39 #include "curl_setup.h"
40
41 #ifdef HAVE_SYS_TYPES_H
42 #include <sys/types.h>
43 #endif
44 #ifdef HAVE_SYS_STAT_H
45 #include <sys/stat.h>
46 #endif
47 #ifdef HAVE_FCNTL_H
48 #include <fcntl.h>
49 #endif
50
51 #include "urldata.h"
52
53 #include "vtls.h" /* generic SSL protos etc */
54 #include "slist.h"
55 #include "sendf.h"
56 #include "strcase.h"
57 #include "url.h"
58 #include "progress.h"
59 #include "share.h"
60 #include "multiif.h"
61 #include "timeval.h"
62 #include "curl_md5.h"
63 #include "warnless.h"
64 #include "curl_base64.h"
65 #include "curl_printf.h"
66
67 /* The last #include files should be: */
68 #include "curl_memory.h"
69 #include "memdebug.h"
70
71 /* convenience macro to check if this handle is using a shared SSL session */
72 #define SSLSESSION_SHARED(data) (data->share && \
73 (data->share->specifier & \
74 (1<<CURL_LOCK_DATA_SSL_SESSION)))
75
76 #define CLONE_STRING(var) \
77 if(source->var) { \
78 dest->var = strdup(source->var); \
79 if(!dest->var) \
80 return FALSE; \
81 } \
82 else \
83 dest->var = NULL;
84
85 bool
86 Curl_ssl_config_matches(struct ssl_primary_config* data,
87 struct ssl_primary_config* needle)
88 {
89 if((data->version == needle->version) &&
90 (data->version_max == needle->version_max) &&
91 (data->verifypeer == needle->verifypeer) &&
92 (data->verifyhost == needle->verifyhost) &&
93 (data->verifystatus == needle->verifystatus) &&
94 Curl_safe_strcasecompare(data->CApath, needle->CApath) &&
95 Curl_safe_strcasecompare(data->CAfile, needle->CAfile) &&
96 Curl_safe_strcasecompare(data->clientcert, needle->clientcert) &&
97 Curl_safe_strcasecompare(data->random_file, needle->random_file) &&
98 Curl_safe_strcasecompare(data->egdsocket, needle->egdsocket) &&
99 Curl_safe_strcasecompare(data->cipher_list, needle->cipher_list) &&
100 Curl_safe_strcasecompare(data->cipher_list13, needle->cipher_list13))
101 return TRUE;
102
103 return FALSE;
104 }
105
106 bool
107 Curl_clone_primary_ssl_config(struct ssl_primary_config *source,
108 struct ssl_primary_config *dest)
109 {
110 dest->version = source->version;
111 dest->version_max = source->version_max;
112 dest->verifypeer = source->verifypeer;
113 dest->verifyhost = source->verifyhost;
114 dest->verifystatus = source->verifystatus;
115 dest->sessionid = source->sessionid;
116
117 CLONE_STRING(CApath);
118 CLONE_STRING(CAfile);
119 CLONE_STRING(clientcert);
120 CLONE_STRING(random_file);
121 CLONE_STRING(egdsocket);
122 CLONE_STRING(cipher_list);
123 CLONE_STRING(cipher_list13);
124
125 return TRUE;
126 }
127
128 void Curl_free_primary_ssl_config(struct ssl_primary_config* sslc)
129 {
130 Curl_safefree(sslc->CApath);
131 Curl_safefree(sslc->CAfile);
132 Curl_safefree(sslc->clientcert);
133 Curl_safefree(sslc->random_file);
134 Curl_safefree(sslc->egdsocket);
135 Curl_safefree(sslc->cipher_list);
136 Curl_safefree(sslc->cipher_list13);
137 }
138
139 #ifdef USE_SSL
140 static int multissl_init(const struct Curl_ssl *backend);
141 #endif
142
143 int Curl_ssl_backend(void)
144 {
145 #ifdef USE_SSL
146 multissl_init(NULL);
147 return Curl_ssl->info.id;
148 #else
149 return (int)CURLSSLBACKEND_NONE;
150 #endif
151 }
152
153 #ifdef USE_SSL
154
155 /* "global" init done? */
156 static bool init_ssl = FALSE;
157
158 /**
159 * Global SSL init
160 *
161 * @retval 0 error initializing SSL
162 * @retval 1 SSL initialized successfully
163 */
164 int Curl_ssl_init(void)
165 {
166 /* make sure this is only done once */
167 if(init_ssl)
168 return 1;
169 init_ssl = TRUE; /* never again */
170
171 return Curl_ssl->init();
172 }
173
174
175 /* Global cleanup */
176 void Curl_ssl_cleanup(void)
177 {
178 if(init_ssl) {
179 /* only cleanup if we did a previous init */
180 Curl_ssl->cleanup();
181 init_ssl = FALSE;
182 }
183 }
184
185 static bool ssl_prefs_check(struct Curl_easy *data)
186 {
187 /* check for CURLOPT_SSLVERSION invalid parameter value */
188 const long sslver = data->set.ssl.primary.version;
189 if((sslver < 0) || (sslver >= CURL_SSLVERSION_LAST)) {
190 failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION");
191 return FALSE;
192 }
193
194 switch(data->set.ssl.primary.version_max) {
195 case CURL_SSLVERSION_MAX_NONE:
196 case CURL_SSLVERSION_MAX_DEFAULT:
197 break;
198
199 default:
200 if((data->set.ssl.primary.version_max >> 16) < sslver) {
201 failf(data, "CURL_SSLVERSION_MAX incompatible with CURL_SSLVERSION");
202 return FALSE;
203 }
204 }
205
206 return TRUE;
207 }
208
209 static CURLcode
210 ssl_connect_init_proxy(struct connectdata *conn, int sockindex)
211 {
212 DEBUGASSERT(conn->bits.proxy_ssl_connected[sockindex]);
213 if(ssl_connection_complete == conn->ssl[sockindex].state &&
214 !conn->proxy_ssl[sockindex].use) {
215 struct ssl_backend_data *pbdata;
216
217 if(!(Curl_ssl->supports & SSLSUPP_HTTPS_PROXY))
218 return CURLE_NOT_BUILT_IN;
219
220 /* The pointers to the ssl backend data, which is opaque here, are swapped
221 rather than move the contents. */
222 pbdata = conn->proxy_ssl[sockindex].backend;
223 conn->proxy_ssl[sockindex] = conn->ssl[sockindex];
224
225 memset(&conn->ssl[sockindex], 0, sizeof(conn->ssl[sockindex]));
226 memset(pbdata, 0, Curl_ssl->sizeof_ssl_backend_data);
227
228 conn->ssl[sockindex].backend = pbdata;
229 }
230 return CURLE_OK;
231 }
232
233 CURLcode
234 Curl_ssl_connect(struct connectdata *conn, int sockindex)
235 {
236 CURLcode result;
237
238 if(conn->bits.proxy_ssl_connected[sockindex]) {
239 result = ssl_connect_init_proxy(conn, sockindex);
240 if(result)
241 return result;
242 }
243
244 if(!ssl_prefs_check(conn->data))
245 return CURLE_SSL_CONNECT_ERROR;
246
247 /* mark this is being ssl-enabled from here on. */
248 conn->ssl[sockindex].use = TRUE;
249 conn->ssl[sockindex].state = ssl_connection_negotiating;
250
251 result = Curl_ssl->connect_blocking(conn, sockindex);
252
253 if(!result)
254 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
255
256 return result;
257 }
258
259 CURLcode
260 Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex,
261 bool *done)
262 {
263 CURLcode result;
264 if(conn->bits.proxy_ssl_connected[sockindex]) {
265 result = ssl_connect_init_proxy(conn, sockindex);
266 if(result)
267 return result;
268 }
269
270 if(!ssl_prefs_check(conn->data))
271 return CURLE_SSL_CONNECT_ERROR;
272
273 /* mark this is being ssl requested from here on. */
274 conn->ssl[sockindex].use = TRUE;
275 result = Curl_ssl->connect_nonblocking(conn, sockindex, done);
276 if(!result && *done)
277 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
278 return result;
279 }
280
281 /*
282 * Lock shared SSL session data
283 */
284 void Curl_ssl_sessionid_lock(struct connectdata *conn)
285 {
286 if(SSLSESSION_SHARED(conn->data))
287 Curl_share_lock(conn->data,
288 CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
289 }
290
291 /*
292 * Unlock shared SSL session data
293 */
294 void Curl_ssl_sessionid_unlock(struct connectdata *conn)
295 {
296 if(SSLSESSION_SHARED(conn->data))
297 Curl_share_unlock(conn->data, CURL_LOCK_DATA_SSL_SESSION);
298 }
299
300 /*
301 * Check if there's a session ID for the given connection in the cache, and if
302 * there's one suitable, it is provided. Returns TRUE when no entry matched.
303 */
304 bool Curl_ssl_getsessionid(struct connectdata *conn,
305 void **ssl_sessionid,
306 size_t *idsize, /* set 0 if unknown */
307 int sockindex)
308 {
309 struct curl_ssl_session *check;
310 struct Curl_easy *data = conn->data;
311 size_t i;
312 long *general_age;
313 bool no_match = TRUE;
314
315 const bool isProxy = CONNECT_PROXY_SSL();
316 struct ssl_primary_config * const ssl_config = isProxy ?
317 &conn->proxy_ssl_config :
318 &conn->ssl_config;
319 const char * const name = isProxy ? conn->http_proxy.host.name :
320 conn->host.name;
321 int port = isProxy ? (int)conn->port : conn->remote_port;
322 *ssl_sessionid = NULL;
323
324 DEBUGASSERT(SSL_SET_OPTION(primary.sessionid));
325
326 if(!SSL_SET_OPTION(primary.sessionid))
327 /* session ID re-use is disabled */
328 return TRUE;
329
330 /* Lock if shared */
331 if(SSLSESSION_SHARED(data))
332 general_age = &data->share->sessionage;
333 else
334 general_age = &data->state.sessionage;
335
336 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
337 check = &data->state.session[i];
338 if(!check->sessionid)
339 /* not session ID means blank entry */
340 continue;
341 if(strcasecompare(name, check->name) &&
342 ((!conn->bits.conn_to_host && !check->conn_to_host) ||
343 (conn->bits.conn_to_host && check->conn_to_host &&
344 strcasecompare(conn->conn_to_host.name, check->conn_to_host))) &&
345 ((!conn->bits.conn_to_port && check->conn_to_port == -1) ||
346 (conn->bits.conn_to_port && check->conn_to_port != -1 &&
347 conn->conn_to_port == check->conn_to_port)) &&
348 (port == check->remote_port) &&
349 strcasecompare(conn->handler->scheme, check->scheme) &&
350 Curl_ssl_config_matches(ssl_config, &check->ssl_config)) {
351 /* yes, we have a session ID! */
352 (*general_age)++; /* increase general age */
353 check->age = *general_age; /* set this as used in this age */
354 *ssl_sessionid = check->sessionid;
355 if(idsize)
356 *idsize = check->idsize;
357 no_match = FALSE;
358 break;
359 }
360 }
361
362 return no_match;
363 }
364
365 /*
366 * Kill a single session ID entry in the cache.
367 */
368 void Curl_ssl_kill_session(struct curl_ssl_session *session)
369 {
370 if(session->sessionid) {
371 /* defensive check */
372
373 /* free the ID the SSL-layer specific way */
374 Curl_ssl->session_free(session->sessionid);
375
376 session->sessionid = NULL;
377 session->age = 0; /* fresh */
378
379 Curl_free_primary_ssl_config(&session->ssl_config);
380
381 Curl_safefree(session->name);
382 Curl_safefree(session->conn_to_host);
383 }
384 }
385
386 /*
387 * Delete the given session ID from the cache.
388 */
389 void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid)
390 {
391 size_t i;
392 struct Curl_easy *data = conn->data;
393
394 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
395 struct curl_ssl_session *check = &data->state.session[i];
396
397 if(check->sessionid == ssl_sessionid) {
398 Curl_ssl_kill_session(check);
399 break;
400 }
401 }
402 }
403
404 /*
405 * Store session id in the session cache. The ID passed on to this function
406 * must already have been extracted and allocated the proper way for the SSL
407 * layer. Curl_XXXX_session_free() will be called to free/kill the session ID
408 * later on.
409 */
410 CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
411 void *ssl_sessionid,
412 size_t idsize,
413 int sockindex)
414 {
415 size_t i;
416 struct Curl_easy *data = conn->data; /* the mother of all structs */
417 struct curl_ssl_session *store = &data->state.session[0];
418 long oldest_age = data->state.session[0].age; /* zero if unused */
419 char *clone_host;
420 char *clone_conn_to_host;
421 int conn_to_port;
422 long *general_age;
423 const bool isProxy = CONNECT_PROXY_SSL();
424 struct ssl_primary_config * const ssl_config = isProxy ?
425 &conn->proxy_ssl_config :
426 &conn->ssl_config;
427
428 DEBUGASSERT(SSL_SET_OPTION(primary.sessionid));
429
430 clone_host = strdup(isProxy ? conn->http_proxy.host.name : conn->host.name);
431 if(!clone_host)
432 return CURLE_OUT_OF_MEMORY; /* bail out */
433
434 if(conn->bits.conn_to_host) {
435 clone_conn_to_host = strdup(conn->conn_to_host.name);
436 if(!clone_conn_to_host) {
437 free(clone_host);
438 return CURLE_OUT_OF_MEMORY; /* bail out */
439 }
440 }
441 else
442 clone_conn_to_host = NULL;
443
444 if(conn->bits.conn_to_port)
445 conn_to_port = conn->conn_to_port;
446 else
447 conn_to_port = -1;
448
449 /* Now we should add the session ID and the host name to the cache, (remove
450 the oldest if necessary) */
451
452 /* If using shared SSL session, lock! */
453 if(SSLSESSION_SHARED(data)) {
454 general_age = &data->share->sessionage;
455 }
456 else {
457 general_age = &data->state.sessionage;
458 }
459
460 /* find an empty slot for us, or find the oldest */
461 for(i = 1; (i < data->set.general_ssl.max_ssl_sessions) &&
462 data->state.session[i].sessionid; i++) {
463 if(data->state.session[i].age < oldest_age) {
464 oldest_age = data->state.session[i].age;
465 store = &data->state.session[i];
466 }
467 }
468 if(i == data->set.general_ssl.max_ssl_sessions)
469 /* cache is full, we must "kill" the oldest entry! */
470 Curl_ssl_kill_session(store);
471 else
472 store = &data->state.session[i]; /* use this slot */
473
474 /* now init the session struct wisely */
475 store->sessionid = ssl_sessionid;
476 store->idsize = idsize;
477 store->age = *general_age; /* set current age */
478 /* free it if there's one already present */
479 free(store->name);
480 free(store->conn_to_host);
481 store->name = clone_host; /* clone host name */
482 store->conn_to_host = clone_conn_to_host; /* clone connect to host name */
483 store->conn_to_port = conn_to_port; /* connect to port number */
484 /* port number */
485 store->remote_port = isProxy ? (int)conn->port : conn->remote_port;
486 store->scheme = conn->handler->scheme;
487
488 if(!Curl_clone_primary_ssl_config(ssl_config, &store->ssl_config)) {
489 store->sessionid = NULL; /* let caller free sessionid */
490 free(clone_host);
491 free(clone_conn_to_host);
492 return CURLE_OUT_OF_MEMORY;
493 }
494
495 return CURLE_OK;
496 }
497
498
499 void Curl_ssl_close_all(struct Curl_easy *data)
500 {
501 /* kill the session ID cache if not shared */
502 if(data->state.session && !SSLSESSION_SHARED(data)) {
503 size_t i;
504 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++)
505 /* the single-killer function handles empty table slots */
506 Curl_ssl_kill_session(&data->state.session[i]);
507
508 /* free the cache data */
509 Curl_safefree(data->state.session);
510 }
511
512 Curl_ssl->close_all(data);
513 }
514
515 #if defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \
516 defined(USE_SECTRANSP) || defined(USE_POLARSSL) || defined(USE_NSS) || \
517 defined(USE_MBEDTLS) || defined(USE_WOLFSSL)
518 int Curl_ssl_getsock(struct connectdata *conn, curl_socket_t *socks)
519 {
520 struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
521
522 if(connssl->connecting_state == ssl_connect_2_writing) {
523 /* write mode */
524 socks[0] = conn->sock[FIRSTSOCKET];
525 return GETSOCK_WRITESOCK(0);
526 }
527 if(connssl->connecting_state == ssl_connect_2_reading) {
528 /* read mode */
529 socks[0] = conn->sock[FIRSTSOCKET];
530 return GETSOCK_READSOCK(0);
531 }
532
533 return GETSOCK_BLANK;
534 }
535 #else
536 int Curl_ssl_getsock(struct connectdata *conn,
537 curl_socket_t *socks)
538 {
539 (void)conn;
540 (void)socks;
541 return GETSOCK_BLANK;
542 }
543 /* USE_OPENSSL || USE_GNUTLS || USE_SCHANNEL || USE_SECTRANSP || USE_NSS */
544 #endif
545
546 void Curl_ssl_close(struct connectdata *conn, int sockindex)
547 {
548 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
549 Curl_ssl->close_one(conn, sockindex);
550 }
551
552 CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex)
553 {
554 if(Curl_ssl->shut_down(conn, sockindex))
555 return CURLE_SSL_SHUTDOWN_FAILED;
556
557 conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */
558 conn->ssl[sockindex].state = ssl_connection_none;
559
560 conn->recv[sockindex] = Curl_recv_plain;
561 conn->send[sockindex] = Curl_send_plain;
562
563 return CURLE_OK;
564 }
565
566 /* Selects an SSL crypto engine
567 */
568 CURLcode Curl_ssl_set_engine(struct Curl_easy *data, const char *engine)
569 {
570 return Curl_ssl->set_engine(data, engine);
571 }
572
573 /* Selects the default SSL crypto engine
574 */
575 CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data)
576 {
577 return Curl_ssl->set_engine_default(data);
578 }
579
580 /* Return list of OpenSSL crypto engine names. */
581 struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data)
582 {
583 return Curl_ssl->engines_list(data);
584 }
585
586 /*
587 * This sets up a session ID cache to the specified size. Make sure this code
588 * is agnostic to what underlying SSL technology we use.
589 */
590 CURLcode Curl_ssl_initsessions(struct Curl_easy *data, size_t amount)
591 {
592 struct curl_ssl_session *session;
593
594 if(data->state.session)
595 /* this is just a precaution to prevent multiple inits */
596 return CURLE_OK;
597
598 session = calloc(amount, sizeof(struct curl_ssl_session));
599 if(!session)
600 return CURLE_OUT_OF_MEMORY;
601
602 /* store the info in the SSL section */
603 data->set.general_ssl.max_ssl_sessions = amount;
604 data->state.session = session;
605 data->state.sessionage = 1; /* this is brand new */
606 return CURLE_OK;
607 }
608
609 static size_t Curl_multissl_version(char *buffer, size_t size);
610
611 size_t Curl_ssl_version(char *buffer, size_t size)
612 {
613 #ifdef CURL_WITH_MULTI_SSL
614 return Curl_multissl_version(buffer, size);
615 #else
616 return Curl_ssl->version(buffer, size);
617 #endif
618 }
619
620 /*
621 * This function tries to determine connection status.
622 *
623 * Return codes:
624 * 1 means the connection is still in place
625 * 0 means the connection has been closed
626 * -1 means the connection status is unknown
627 */
628 int Curl_ssl_check_cxn(struct connectdata *conn)
629 {
630 return Curl_ssl->check_cxn(conn);
631 }
632
633 bool Curl_ssl_data_pending(const struct connectdata *conn,
634 int connindex)
635 {
636 return Curl_ssl->data_pending(conn, connindex);
637 }
638
639 void Curl_ssl_free_certinfo(struct Curl_easy *data)
640 {
641 struct curl_certinfo *ci = &data->info.certs;
642
643 if(ci->num_of_certs) {
644 /* free all individual lists used */
645 int i;
646 for(i = 0; i<ci->num_of_certs; i++) {
647 curl_slist_free_all(ci->certinfo[i]);
648 ci->certinfo[i] = NULL;
649 }
650
651 free(ci->certinfo); /* free the actual array too */
652 ci->certinfo = NULL;
653 ci->num_of_certs = 0;
654 }
655 }
656
657 CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num)
658 {
659 struct curl_certinfo *ci = &data->info.certs;
660 struct curl_slist **table;
661
662 /* Free any previous certificate information structures */
663 Curl_ssl_free_certinfo(data);
664
665 /* Allocate the required certificate information structures */
666 table = calloc((size_t) num, sizeof(struct curl_slist *));
667 if(!table)
668 return CURLE_OUT_OF_MEMORY;
669
670 ci->num_of_certs = num;
671 ci->certinfo = table;
672
673 return CURLE_OK;
674 }
675
676 /*
677 * 'value' is NOT a zero terminated string
678 */
679 CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data,
680 int certnum,
681 const char *label,
682 const char *value,
683 size_t valuelen)
684 {
685 struct curl_certinfo *ci = &data->info.certs;
686 char *output;
687 struct curl_slist *nl;
688 CURLcode result = CURLE_OK;
689 size_t labellen = strlen(label);
690 size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */
691
692 output = malloc(outlen);
693 if(!output)
694 return CURLE_OUT_OF_MEMORY;
695
696 /* sprintf the label and colon */
697 msnprintf(output, outlen, "%s:", label);
698
699 /* memcpy the value (it might not be zero terminated) */
700 memcpy(&output[labellen + 1], value, valuelen);
701
702 /* zero terminate the output */
703 output[labellen + 1 + valuelen] = 0;
704
705 nl = Curl_slist_append_nodup(ci->certinfo[certnum], output);
706 if(!nl) {
707 free(output);
708 curl_slist_free_all(ci->certinfo[certnum]);
709 result = CURLE_OUT_OF_MEMORY;
710 }
711
712 ci->certinfo[certnum] = nl;
713 return result;
714 }
715
716 /*
717 * This is a convenience function for push_certinfo_len that takes a zero
718 * terminated value.
719 */
720 CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data,
721 int certnum,
722 const char *label,
723 const char *value)
724 {
725 size_t valuelen = strlen(value);
726
727 return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen);
728 }
729
730 CURLcode Curl_ssl_random(struct Curl_easy *data,
731 unsigned char *entropy,
732 size_t length)
733 {
734 return Curl_ssl->random(data, entropy, length);
735 }
736
737 /*
738 * Public key pem to der conversion
739 */
740
741 static CURLcode pubkey_pem_to_der(const char *pem,
742 unsigned char **der, size_t *der_len)
743 {
744 char *stripped_pem, *begin_pos, *end_pos;
745 size_t pem_count, stripped_pem_count = 0, pem_len;
746 CURLcode result;
747
748 /* if no pem, exit. */
749 if(!pem)
750 return CURLE_BAD_CONTENT_ENCODING;
751
752 begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----");
753 if(!begin_pos)
754 return CURLE_BAD_CONTENT_ENCODING;
755
756 pem_count = begin_pos - pem;
757 /* Invalid if not at beginning AND not directly following \n */
758 if(0 != pem_count && '\n' != pem[pem_count - 1])
759 return CURLE_BAD_CONTENT_ENCODING;
760
761 /* 26 is length of "-----BEGIN PUBLIC KEY-----" */
762 pem_count += 26;
763
764 /* Invalid if not directly following \n */
765 end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----");
766 if(!end_pos)
767 return CURLE_BAD_CONTENT_ENCODING;
768
769 pem_len = end_pos - pem;
770
771 stripped_pem = malloc(pem_len - pem_count + 1);
772 if(!stripped_pem)
773 return CURLE_OUT_OF_MEMORY;
774
775 /*
776 * Here we loop through the pem array one character at a time between the
777 * correct indices, and place each character that is not '\n' or '\r'
778 * into the stripped_pem array, which should represent the raw base64 string
779 */
780 while(pem_count < pem_len) {
781 if('\n' != pem[pem_count] && '\r' != pem[pem_count])
782 stripped_pem[stripped_pem_count++] = pem[pem_count];
783 ++pem_count;
784 }
785 /* Place the null terminator in the correct place */
786 stripped_pem[stripped_pem_count] = '\0';
787
788 result = Curl_base64_decode(stripped_pem, der, der_len);
789
790 Curl_safefree(stripped_pem);
791
792 return result;
793 }
794
795 /*
796 * Generic pinned public key check.
797 */
798
799 CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
800 const char *pinnedpubkey,
801 const unsigned char *pubkey, size_t pubkeylen)
802 {
803 FILE *fp;
804 unsigned char *buf = NULL, *pem_ptr = NULL;
805 CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
806
807 /* if a path wasn't specified, don't pin */
808 if(!pinnedpubkey)
809 return CURLE_OK;
810 if(!pubkey || !pubkeylen)
811 return result;
812
813 /* only do this if pinnedpubkey starts with "sha256//", length 8 */
814 if(strncmp(pinnedpubkey, "sha256//", 8) == 0) {
815 CURLcode encode;
816 size_t encodedlen, pinkeylen;
817 char *encoded, *pinkeycopy, *begin_pos, *end_pos;
818 unsigned char *sha256sumdigest;
819
820 if(!Curl_ssl->sha256sum) {
821 /* without sha256 support, this cannot match */
822 return result;
823 }
824
825 /* compute sha256sum of public key */
826 sha256sumdigest = malloc(CURL_SHA256_DIGEST_LENGTH);
827 if(!sha256sumdigest)
828 return CURLE_OUT_OF_MEMORY;
829 encode = Curl_ssl->sha256sum(pubkey, pubkeylen,
830 sha256sumdigest, CURL_SHA256_DIGEST_LENGTH);
831
832 if(encode != CURLE_OK)
833 return encode;
834
835 encode = Curl_base64_encode(data, (char *)sha256sumdigest,
836 CURL_SHA256_DIGEST_LENGTH, &encoded,
837 &encodedlen);
838 Curl_safefree(sha256sumdigest);
839
840 if(encode)
841 return encode;
842
843 infof(data, "\t public key hash: sha256//%s\n", encoded);
844
845 /* it starts with sha256//, copy so we can modify it */
846 pinkeylen = strlen(pinnedpubkey) + 1;
847 pinkeycopy = malloc(pinkeylen);
848 if(!pinkeycopy) {
849 Curl_safefree(encoded);
850 return CURLE_OUT_OF_MEMORY;
851 }
852 memcpy(pinkeycopy, pinnedpubkey, pinkeylen);
853 /* point begin_pos to the copy, and start extracting keys */
854 begin_pos = pinkeycopy;
855 do {
856 end_pos = strstr(begin_pos, ";sha256//");
857 /*
858 * if there is an end_pos, null terminate,
859 * otherwise it'll go to the end of the original string
860 */
861 if(end_pos)
862 end_pos[0] = '\0';
863
864 /* compare base64 sha256 digests, 8 is the length of "sha256//" */
865 if(encodedlen == strlen(begin_pos + 8) &&
866 !memcmp(encoded, begin_pos + 8, encodedlen)) {
867 result = CURLE_OK;
868 break;
869 }
870
871 /*
872 * change back the null-terminator we changed earlier,
873 * and look for next begin
874 */
875 if(end_pos) {
876 end_pos[0] = ';';
877 begin_pos = strstr(end_pos, "sha256//");
878 }
879 } while(end_pos && begin_pos);
880 Curl_safefree(encoded);
881 Curl_safefree(pinkeycopy);
882 return result;
883 }
884
885 fp = fopen(pinnedpubkey, "rb");
886 if(!fp)
887 return result;
888
889 do {
890 long filesize;
891 size_t size, pem_len;
892 CURLcode pem_read;
893
894 /* Determine the file's size */
895 if(fseek(fp, 0, SEEK_END))
896 break;
897 filesize = ftell(fp);
898 if(fseek(fp, 0, SEEK_SET))
899 break;
900 if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE)
901 break;
902
903 /*
904 * if the size of our certificate is bigger than the file
905 * size then it can't match
906 */
907 size = curlx_sotouz((curl_off_t) filesize);
908 if(pubkeylen > size)
909 break;
910
911 /*
912 * Allocate buffer for the pinned key
913 * With 1 additional byte for null terminator in case of PEM key
914 */
915 buf = malloc(size + 1);
916 if(!buf)
917 break;
918
919 /* Returns number of elements read, which should be 1 */
920 if((int) fread(buf, size, 1, fp) != 1)
921 break;
922
923 /* If the sizes are the same, it can't be base64 encoded, must be der */
924 if(pubkeylen == size) {
925 if(!memcmp(pubkey, buf, pubkeylen))
926 result = CURLE_OK;
927 break;
928 }
929
930 /*
931 * Otherwise we will assume it's PEM and try to decode it
932 * after placing null terminator
933 */
934 buf[size] = '\0';
935 pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len);
936 /* if it wasn't read successfully, exit */
937 if(pem_read)
938 break;
939
940 /*
941 * if the size of our certificate doesn't match the size of
942 * the decoded file, they can't be the same, otherwise compare
943 */
944 if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen))
945 result = CURLE_OK;
946 } while(0);
947
948 Curl_safefree(buf);
949 Curl_safefree(pem_ptr);
950 fclose(fp);
951
952 return result;
953 }
954
955 #ifndef CURL_DISABLE_CRYPTO_AUTH
956 CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */
957 size_t tmplen,
958 unsigned char *md5sum, /* output */
959 size_t md5len)
960 {
961 return Curl_ssl->md5sum(tmp, tmplen, md5sum, md5len);
962 }
963 #endif
964
965 /*
966 * Check whether the SSL backend supports the status_request extension.
967 */
968 bool Curl_ssl_cert_status_request(void)
969 {
970 return Curl_ssl->cert_status_request();
971 }
972
973 /*
974 * Check whether the SSL backend supports false start.
975 */
976 bool Curl_ssl_false_start(void)
977 {
978 return Curl_ssl->false_start();
979 }
980
981 /*
982 * Check whether the SSL backend supports setting TLS 1.3 cipher suites
983 */
984 bool Curl_ssl_tls13_ciphersuites(void)
985 {
986 return Curl_ssl->supports & SSLSUPP_TLS13_CIPHERSUITES;
987 }
988
989 /*
990 * Default implementations for unsupported functions.
991 */
992
993 int Curl_none_init(void)
994 {
995 return 1;
996 }
997
998 void Curl_none_cleanup(void)
999 { }
1000
1001 int Curl_none_shutdown(struct connectdata *conn UNUSED_PARAM,
1002 int sockindex UNUSED_PARAM)
1003 {
1004 (void)conn;
1005 (void)sockindex;
1006 return 0;
1007 }
1008
1009 int Curl_none_check_cxn(struct connectdata *conn UNUSED_PARAM)
1010 {
1011 (void)conn;
1012 return -1;
1013 }
1014
1015 CURLcode Curl_none_random(struct Curl_easy *data UNUSED_PARAM,
1016 unsigned char *entropy UNUSED_PARAM,
1017 size_t length UNUSED_PARAM)
1018 {
1019 (void)data;
1020 (void)entropy;
1021 (void)length;
1022 return CURLE_NOT_BUILT_IN;
1023 }
1024
1025 void Curl_none_close_all(struct Curl_easy *data UNUSED_PARAM)
1026 {
1027 (void)data;
1028 }
1029
1030 void Curl_none_session_free(void *ptr UNUSED_PARAM)
1031 {
1032 (void)ptr;
1033 }
1034
1035 bool Curl_none_data_pending(const struct connectdata *conn UNUSED_PARAM,
1036 int connindex UNUSED_PARAM)
1037 {
1038 (void)conn;
1039 (void)connindex;
1040 return 0;
1041 }
1042
1043 bool Curl_none_cert_status_request(void)
1044 {
1045 return FALSE;
1046 }
1047
1048 CURLcode Curl_none_set_engine(struct Curl_easy *data UNUSED_PARAM,
1049 const char *engine UNUSED_PARAM)
1050 {
1051 (void)data;
1052 (void)engine;
1053 return CURLE_NOT_BUILT_IN;
1054 }
1055
1056 CURLcode Curl_none_set_engine_default(struct Curl_easy *data UNUSED_PARAM)
1057 {
1058 (void)data;
1059 return CURLE_NOT_BUILT_IN;
1060 }
1061
1062 struct curl_slist *Curl_none_engines_list(struct Curl_easy *data UNUSED_PARAM)
1063 {
1064 (void)data;
1065 return (struct curl_slist *)NULL;
1066 }
1067
1068 bool Curl_none_false_start(void)
1069 {
1070 return FALSE;
1071 }
1072
1073 #ifndef CURL_DISABLE_CRYPTO_AUTH
1074 CURLcode Curl_none_md5sum(unsigned char *input, size_t inputlen,
1075 unsigned char *md5sum, size_t md5len UNUSED_PARAM)
1076 {
1077 MD5_context *MD5pw;
1078
1079 (void)md5len;
1080
1081 MD5pw = Curl_MD5_init(Curl_DIGEST_MD5);
1082 if(!MD5pw)
1083 return CURLE_OUT_OF_MEMORY;
1084 Curl_MD5_update(MD5pw, input, curlx_uztoui(inputlen));
1085 Curl_MD5_final(MD5pw, md5sum);
1086 return CURLE_OK;
1087 }
1088 #else
1089 CURLcode Curl_none_md5sum(unsigned char *input UNUSED_PARAM,
1090 size_t inputlen UNUSED_PARAM,
1091 unsigned char *md5sum UNUSED_PARAM,
1092 size_t md5len UNUSED_PARAM)
1093 {
1094 (void)input;
1095 (void)inputlen;
1096 (void)md5sum;
1097 (void)md5len;
1098 return CURLE_NOT_BUILT_IN;
1099 }
1100 #endif
1101
1102 static int Curl_multissl_init(void)
1103 {
1104 if(multissl_init(NULL))
1105 return 1;
1106 return Curl_ssl->init();
1107 }
1108
1109 static CURLcode Curl_multissl_connect(struct connectdata *conn, int sockindex)
1110 {
1111 if(multissl_init(NULL))
1112 return CURLE_FAILED_INIT;
1113 return Curl_ssl->connect_blocking(conn, sockindex);
1114 }
1115
1116 static CURLcode Curl_multissl_connect_nonblocking(struct connectdata *conn,
1117 int sockindex, bool *done)
1118 {
1119 if(multissl_init(NULL))
1120 return CURLE_FAILED_INIT;
1121 return Curl_ssl->connect_nonblocking(conn, sockindex, done);
1122 }
1123
1124 static void *Curl_multissl_get_internals(struct ssl_connect_data *connssl,
1125 CURLINFO info)
1126 {
1127 if(multissl_init(NULL))
1128 return NULL;
1129 return Curl_ssl->get_internals(connssl, info);
1130 }
1131
1132 static void Curl_multissl_close(struct connectdata *conn, int sockindex)
1133 {
1134 if(multissl_init(NULL))
1135 return;
1136 Curl_ssl->close_one(conn, sockindex);
1137 }
1138
1139 static const struct Curl_ssl Curl_ssl_multi = {
1140 { CURLSSLBACKEND_NONE, "multi" }, /* info */
1141 0, /* supports nothing */
1142 (size_t)-1, /* something insanely large to be on the safe side */
1143
1144 Curl_multissl_init, /* init */
1145 Curl_none_cleanup, /* cleanup */
1146 Curl_multissl_version, /* version */
1147 Curl_none_check_cxn, /* check_cxn */
1148 Curl_none_shutdown, /* shutdown */
1149 Curl_none_data_pending, /* data_pending */
1150 Curl_none_random, /* random */
1151 Curl_none_cert_status_request, /* cert_status_request */
1152 Curl_multissl_connect, /* connect */
1153 Curl_multissl_connect_nonblocking, /* connect_nonblocking */
1154 Curl_multissl_get_internals, /* get_internals */
1155 Curl_multissl_close, /* close_one */
1156 Curl_none_close_all, /* close_all */
1157 Curl_none_session_free, /* session_free */
1158 Curl_none_set_engine, /* set_engine */
1159 Curl_none_set_engine_default, /* set_engine_default */
1160 Curl_none_engines_list, /* engines_list */
1161 Curl_none_false_start, /* false_start */
1162 Curl_none_md5sum, /* md5sum */
1163 NULL /* sha256sum */
1164 };
1165
1166 const struct Curl_ssl *Curl_ssl =
1167 #if defined(CURL_WITH_MULTI_SSL)
1168 &Curl_ssl_multi;
1169 #elif defined(USE_WOLFSSL)
1170 &Curl_ssl_wolfssl;
1171 #elif defined(USE_SECTRANSP)
1172 &Curl_ssl_sectransp;
1173 #elif defined(USE_GNUTLS)
1174 &Curl_ssl_gnutls;
1175 #elif defined(USE_GSKIT)
1176 &Curl_ssl_gskit;
1177 #elif defined(USE_MBEDTLS)
1178 &Curl_ssl_mbedtls;
1179 #elif defined(USE_NSS)
1180 &Curl_ssl_nss;
1181 #elif defined(USE_OPENSSL)
1182 &Curl_ssl_openssl;
1183 #elif defined(USE_POLARSSL)
1184 &Curl_ssl_polarssl;
1185 #elif defined(USE_SCHANNEL)
1186 &Curl_ssl_schannel;
1187 #elif defined(USE_MESALINK)
1188 &Curl_ssl_mesalink;
1189 #else
1190 #error "Missing struct Curl_ssl for selected SSL backend"
1191 #endif
1192
1193 static const struct Curl_ssl *available_backends[] = {
1194 #if defined(USE_WOLFSSL)
1195 &Curl_ssl_wolfssl,
1196 #endif
1197 #if defined(USE_SECTRANSP)
1198 &Curl_ssl_sectransp,
1199 #endif
1200 #if defined(USE_GNUTLS)
1201 &Curl_ssl_gnutls,
1202 #endif
1203 #if defined(USE_GSKIT)
1204 &Curl_ssl_gskit,
1205 #endif
1206 #if defined(USE_MBEDTLS)
1207 &Curl_ssl_mbedtls,
1208 #endif
1209 #if defined(USE_NSS)
1210 &Curl_ssl_nss,
1211 #endif
1212 #if defined(USE_OPENSSL)
1213 &Curl_ssl_openssl,
1214 #endif
1215 #if defined(USE_POLARSSL)
1216 &Curl_ssl_polarssl,
1217 #endif
1218 #if defined(USE_SCHANNEL)
1219 &Curl_ssl_schannel,
1220 #endif
1221 #if defined(USE_MESALINK)
1222 &Curl_ssl_mesalink,
1223 #endif
1224 NULL
1225 };
1226
1227 static size_t Curl_multissl_version(char *buffer, size_t size)
1228 {
1229 static const struct Curl_ssl *selected;
1230 static char backends[200];
1231 static size_t total;
1232 const struct Curl_ssl *current;
1233
1234 current = Curl_ssl == &Curl_ssl_multi ? available_backends[0] : Curl_ssl;
1235
1236 if(current != selected) {
1237 char *p = backends;
1238 char *end = backends + sizeof(backends);
1239 int i;
1240
1241 selected = current;
1242
1243 for(i = 0; available_backends[i] && p < (end - 4); i++) {
1244 if(i)
1245 *(p++) = ' ';
1246 if(selected != available_backends[i])
1247 *(p++) = '(';
1248 p += available_backends[i]->version(p, end - p - 2);
1249 if(selected != available_backends[i])
1250 *(p++) = ')';
1251 }
1252 *p = '\0';
1253 total = p - backends;
1254 }
1255
1256 if(size > total)
1257 memcpy(buffer, backends, total + 1);
1258 else {
1259 memcpy(buffer, backends, size - 1);
1260 buffer[size - 1] = '\0';
1261 }
1262
1263 return CURLMIN(size - 1, total);
1264 }
1265
1266 static int multissl_init(const struct Curl_ssl *backend)
1267 {
1268 const char *env;
1269 char *env_tmp;
1270
1271 if(Curl_ssl != &Curl_ssl_multi)
1272 return 1;
1273
1274 if(backend) {
1275 Curl_ssl = backend;
1276 return 0;
1277 }
1278
1279 if(!available_backends[0])
1280 return 1;
1281
1282 env = env_tmp = curl_getenv("CURL_SSL_BACKEND");
1283 #ifdef CURL_DEFAULT_SSL_BACKEND
1284 if(!env)
1285 env = CURL_DEFAULT_SSL_BACKEND;
1286 #endif
1287 if(env) {
1288 int i;
1289 for(i = 0; available_backends[i]; i++) {
1290 if(strcasecompare(env, available_backends[i]->info.name)) {
1291 Curl_ssl = available_backends[i];
1292 curl_free(env_tmp);
1293 return 0;
1294 }
1295 }
1296 }
1297
1298 /* Fall back to first available backend */
1299 Curl_ssl = available_backends[0];
1300 curl_free(env_tmp);
1301 return 0;
1302 }
1303
1304 CURLsslset curl_global_sslset(curl_sslbackend id, const char *name,
1305 const curl_ssl_backend ***avail)
1306 {
1307 int i;
1308
1309 if(avail)
1310 *avail = (const curl_ssl_backend **)&available_backends;
1311
1312 if(Curl_ssl != &Curl_ssl_multi)
1313 return id == Curl_ssl->info.id ||
1314 (name && strcasecompare(name, Curl_ssl->info.name)) ?
1315 CURLSSLSET_OK :
1316 #if defined(CURL_WITH_MULTI_SSL)
1317 CURLSSLSET_TOO_LATE;
1318 #else
1319 CURLSSLSET_UNKNOWN_BACKEND;
1320 #endif
1321
1322 for(i = 0; available_backends[i]; i++) {
1323 if(available_backends[i]->info.id == id ||
1324 (name && strcasecompare(available_backends[i]->info.name, name))) {
1325 multissl_init(available_backends[i]);
1326 return CURLSSLSET_OK;
1327 }
1328 }
1329
1330 return CURLSSLSET_UNKNOWN_BACKEND;
1331 }
1332
1333 #else /* USE_SSL */
1334 CURLsslset curl_global_sslset(curl_sslbackend id, const char *name,
1335 const curl_ssl_backend ***avail)
1336 {
1337 (void)id;
1338 (void)name;
1339 (void)avail;
1340 return CURLSSLSET_NO_BACKENDS;
1341 }
1342
1343 #endif /* !USE_SSL */