1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 /* This file is for implementing all "generic" SSL functions that all libcurl
26 internals should use. It is then responsible for calling the proper
27 "backend" function.
28
29 SSL-functions in libcurl should call functions in this source file, and not
30 to any specific SSL-layer.
31
32 Curl_ssl_ - prefix for generic ones
33
34 Note that this source code uses the functions of the configured SSL
35 backend via the global Curl_ssl instance.
36
37 "SSL/TLS Strong Encryption: An Introduction"
38 https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html
39 */
40
41 #include "curl_setup.h"
42
43 #ifdef HAVE_SYS_TYPES_H
44 #include <sys/types.h>
45 #endif
46 #ifdef HAVE_SYS_STAT_H
47 #include <sys/stat.h>
48 #endif
49 #ifdef HAVE_FCNTL_H
50 #include <fcntl.h>
51 #endif
52
53 #include "urldata.h"
54 #include "cfilters.h"
55
56 #include "vtls.h" /* generic SSL protos etc */
57 #include "vtls_int.h"
58 #include "slist.h"
59 #include "sendf.h"
60 #include "strcase.h"
61 #include "url.h"
62 #include "progress.h"
63 #include "share.h"
64 #include "multiif.h"
65 #include "timeval.h"
66 #include "curl_md5.h"
67 #include "warnless.h"
68 #include "curl_base64.h"
69 #include "curl_printf.h"
70 #include "strdup.h"
71
72 /* The last #include files should be: */
73 #include "curl_memory.h"
74 #include "memdebug.h"
75
76
77 /* convenience macro to check if this handle is using a shared SSL session */
78 #define SSLSESSION_SHARED(data) (data->share && \
79 (data->share->specifier & \
80 (1<<CURL_LOCK_DATA_SSL_SESSION)))
81
82 #define CLONE_STRING(var) \
83 do { \
84 if(source->var) { \
85 dest->var = strdup(source->var); \
86 if(!dest->var) \
87 return FALSE; \
88 } \
89 else \
90 dest->var = NULL; \
91 } while(0)
92
93 #define CLONE_BLOB(var) \
94 do { \
95 if(blobdup(&dest->var, source->var)) \
96 return FALSE; \
97 } while(0)
98
blobdup(struct curl_blob ** dest,struct curl_blob * src)99 static CURLcode blobdup(struct curl_blob **dest,
100 struct curl_blob *src)
101 {
102 DEBUGASSERT(dest);
103 DEBUGASSERT(!*dest);
104 if(src) {
105 /* only if there's data to dupe! */
106 struct curl_blob *d;
107 d = malloc(sizeof(struct curl_blob) + src->len);
108 if(!d)
109 return CURLE_OUT_OF_MEMORY;
110 d->len = src->len;
111 /* Always duplicate because the connection may survive longer than the
112 handle that passed in the blob. */
113 d->flags = CURL_BLOB_COPY;
114 d->data = (void *)((char *)d + sizeof(struct curl_blob));
115 memcpy(d->data, src->data, src->len);
116 *dest = d;
117 }
118 return CURLE_OK;
119 }
120
121 /* returns TRUE if the blobs are identical */
blobcmp(struct curl_blob * first,struct curl_blob * second)122 static bool blobcmp(struct curl_blob *first, struct curl_blob *second)
123 {
124 if(!first && !second) /* both are NULL */
125 return TRUE;
126 if(!first || !second) /* one is NULL */
127 return FALSE;
128 if(first->len != second->len) /* different sizes */
129 return FALSE;
130 return !memcmp(first->data, second->data, first->len); /* same data */
131 }
132
133
134 bool
Curl_ssl_config_matches(struct ssl_primary_config * data,struct ssl_primary_config * needle)135 Curl_ssl_config_matches(struct ssl_primary_config *data,
136 struct ssl_primary_config *needle)
137 {
138 if((data->version == needle->version) &&
139 (data->version_max == needle->version_max) &&
140 (data->ssl_options == needle->ssl_options) &&
141 (data->verifypeer == needle->verifypeer) &&
142 (data->verifyhost == needle->verifyhost) &&
143 (data->verifystatus == needle->verifystatus) &&
144 blobcmp(data->cert_blob, needle->cert_blob) &&
145 blobcmp(data->ca_info_blob, needle->ca_info_blob) &&
146 blobcmp(data->issuercert_blob, needle->issuercert_blob) &&
147 Curl_safecmp(data->CApath, needle->CApath) &&
148 Curl_safecmp(data->CAfile, needle->CAfile) &&
149 Curl_safecmp(data->issuercert, needle->issuercert) &&
150 Curl_safecmp(data->clientcert, needle->clientcert) &&
151 #ifdef USE_TLS_SRP
152 !Curl_timestrcmp(data->username, needle->username) &&
153 !Curl_timestrcmp(data->password, needle->password) &&
154 #endif
155 strcasecompare(data->cipher_list, needle->cipher_list) &&
156 strcasecompare(data->cipher_list13, needle->cipher_list13) &&
157 strcasecompare(data->curves, needle->curves) &&
158 strcasecompare(data->CRLfile, needle->CRLfile) &&
159 strcasecompare(data->pinned_key, needle->pinned_key))
160 return TRUE;
161
162 return FALSE;
163 }
164
165 bool
Curl_clone_primary_ssl_config(struct ssl_primary_config * source,struct ssl_primary_config * dest)166 Curl_clone_primary_ssl_config(struct ssl_primary_config *source,
167 struct ssl_primary_config *dest)
168 {
169 dest->version = source->version;
170 dest->version_max = source->version_max;
171 dest->verifypeer = source->verifypeer;
172 dest->verifyhost = source->verifyhost;
173 dest->verifystatus = source->verifystatus;
174 dest->sessionid = source->sessionid;
175 dest->ssl_options = source->ssl_options;
176
177 CLONE_BLOB(cert_blob);
178 CLONE_BLOB(ca_info_blob);
179 CLONE_BLOB(issuercert_blob);
180 CLONE_STRING(CApath);
181 CLONE_STRING(CAfile);
182 CLONE_STRING(issuercert);
183 CLONE_STRING(clientcert);
184 CLONE_STRING(cipher_list);
185 CLONE_STRING(cipher_list13);
186 CLONE_STRING(pinned_key);
187 CLONE_STRING(curves);
188 CLONE_STRING(CRLfile);
189 #ifdef USE_TLS_SRP
190 CLONE_STRING(username);
191 CLONE_STRING(password);
192 #endif
193
194 return TRUE;
195 }
196
Curl_free_primary_ssl_config(struct ssl_primary_config * sslc)197 void Curl_free_primary_ssl_config(struct ssl_primary_config *sslc)
198 {
199 Curl_safefree(sslc->CApath);
200 Curl_safefree(sslc->CAfile);
201 Curl_safefree(sslc->issuercert);
202 Curl_safefree(sslc->clientcert);
203 Curl_safefree(sslc->cipher_list);
204 Curl_safefree(sslc->cipher_list13);
205 Curl_safefree(sslc->pinned_key);
206 Curl_safefree(sslc->cert_blob);
207 Curl_safefree(sslc->ca_info_blob);
208 Curl_safefree(sslc->issuercert_blob);
209 Curl_safefree(sslc->curves);
210 Curl_safefree(sslc->CRLfile);
211 #ifdef USE_TLS_SRP
212 Curl_safefree(sslc->username);
213 Curl_safefree(sslc->password);
214 #endif
215 }
216
217 #ifdef USE_SSL
218 static int multissl_setup(const struct Curl_ssl *backend);
219 #endif
220
Curl_ssl_backend(void)221 curl_sslbackend Curl_ssl_backend(void)
222 {
223 #ifdef USE_SSL
224 multissl_setup(NULL);
225 return Curl_ssl->info.id;
226 #else
227 return CURLSSLBACKEND_NONE;
228 #endif
229 }
230
231 #ifdef USE_SSL
232
233 /* "global" init done? */
234 static bool init_ssl = FALSE;
235
236 /**
237 * Global SSL init
238 *
239 * @retval 0 error initializing SSL
240 * @retval 1 SSL initialized successfully
241 */
Curl_ssl_init(void)242 int Curl_ssl_init(void)
243 {
244 /* make sure this is only done once */
245 if(init_ssl)
246 return 1;
247 init_ssl = TRUE; /* never again */
248
249 return Curl_ssl->init();
250 }
251
252 #if defined(CURL_WITH_MULTI_SSL)
253 static const struct Curl_ssl Curl_ssl_multi;
254 #endif
255
256 /* Global cleanup */
Curl_ssl_cleanup(void)257 void Curl_ssl_cleanup(void)
258 {
259 if(init_ssl) {
260 /* only cleanup if we did a previous init */
261 Curl_ssl->cleanup();
262 #if defined(CURL_WITH_MULTI_SSL)
263 Curl_ssl = &Curl_ssl_multi;
264 #endif
265 init_ssl = FALSE;
266 }
267 }
268
ssl_prefs_check(struct Curl_easy * data)269 static bool ssl_prefs_check(struct Curl_easy *data)
270 {
271 /* check for CURLOPT_SSLVERSION invalid parameter value */
272 const unsigned char sslver = data->set.ssl.primary.version;
273 if(sslver >= CURL_SSLVERSION_LAST) {
274 failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION");
275 return FALSE;
276 }
277
278 switch(data->set.ssl.primary.version_max) {
279 case CURL_SSLVERSION_MAX_NONE:
280 case CURL_SSLVERSION_MAX_DEFAULT:
281 break;
282
283 default:
284 if((data->set.ssl.primary.version_max >> 16) < sslver) {
285 failf(data, "CURL_SSLVERSION_MAX incompatible with CURL_SSLVERSION");
286 return FALSE;
287 }
288 }
289
290 return TRUE;
291 }
292
cf_ctx_new(struct Curl_easy * data,const struct alpn_spec * alpn)293 static struct ssl_connect_data *cf_ctx_new(struct Curl_easy *data,
294 const struct alpn_spec *alpn)
295 {
296 struct ssl_connect_data *ctx;
297
298 (void)data;
299 ctx = calloc(1, sizeof(*ctx));
300 if(!ctx)
301 return NULL;
302
303 ctx->alpn = alpn;
304 ctx->backend = calloc(1, Curl_ssl->sizeof_ssl_backend_data);
305 if(!ctx->backend) {
306 free(ctx);
307 return NULL;
308 }
309 return ctx;
310 }
311
cf_ctx_free(struct ssl_connect_data * ctx)312 static void cf_ctx_free(struct ssl_connect_data *ctx)
313 {
314 if(ctx) {
315 free(ctx->backend);
316 free(ctx);
317 }
318 }
319
ssl_connect(struct Curl_cfilter * cf,struct Curl_easy * data)320 static CURLcode ssl_connect(struct Curl_cfilter *cf, struct Curl_easy *data)
321 {
322 struct ssl_connect_data *connssl = cf->ctx;
323 CURLcode result;
324
325 if(!ssl_prefs_check(data))
326 return CURLE_SSL_CONNECT_ERROR;
327
328 /* mark this is being ssl-enabled from here on. */
329 connssl->state = ssl_connection_negotiating;
330
331 result = Curl_ssl->connect_blocking(cf, data);
332
333 if(!result) {
334 DEBUGASSERT(connssl->state == ssl_connection_complete);
335 }
336
337 return result;
338 }
339
340 static CURLcode
ssl_connect_nonblocking(struct Curl_cfilter * cf,struct Curl_easy * data,bool * done)341 ssl_connect_nonblocking(struct Curl_cfilter *cf, struct Curl_easy *data,
342 bool *done)
343 {
344 if(!ssl_prefs_check(data))
345 return CURLE_SSL_CONNECT_ERROR;
346
347 /* mark this is being ssl requested from here on. */
348 return Curl_ssl->connect_nonblocking(cf, data, done);
349 }
350
351 /*
352 * Lock shared SSL session data
353 */
Curl_ssl_sessionid_lock(struct Curl_easy * data)354 void Curl_ssl_sessionid_lock(struct Curl_easy *data)
355 {
356 if(SSLSESSION_SHARED(data))
357 Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
358 }
359
360 /*
361 * Unlock shared SSL session data
362 */
Curl_ssl_sessionid_unlock(struct Curl_easy * data)363 void Curl_ssl_sessionid_unlock(struct Curl_easy *data)
364 {
365 if(SSLSESSION_SHARED(data))
366 Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION);
367 }
368
369 /*
370 * Check if there's a session ID for the given connection in the cache, and if
371 * there's one suitable, it is provided. Returns TRUE when no entry matched.
372 */
Curl_ssl_getsessionid(struct Curl_cfilter * cf,struct Curl_easy * data,void ** ssl_sessionid,size_t * idsize)373 bool Curl_ssl_getsessionid(struct Curl_cfilter *cf,
374 struct Curl_easy *data,
375 void **ssl_sessionid,
376 size_t *idsize) /* set 0 if unknown */
377 {
378 struct ssl_connect_data *connssl = cf->ctx;
379 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
380 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
381 struct Curl_ssl_session *check;
382 size_t i;
383 long *general_age;
384 bool no_match = TRUE;
385
386 *ssl_sessionid = NULL;
387 if(!ssl_config)
388 return TRUE;
389
390 DEBUGASSERT(ssl_config->primary.sessionid);
391
392 if(!ssl_config->primary.sessionid || !data->state.session)
393 /* session ID re-use is disabled or the session cache has not been
394 setup */
395 return TRUE;
396
397 /* Lock if shared */
398 if(SSLSESSION_SHARED(data))
399 general_age = &data->share->sessionage;
400 else
401 general_age = &data->state.sessionage;
402
403 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
404 check = &data->state.session[i];
405 if(!check->sessionid)
406 /* not session ID means blank entry */
407 continue;
408 if(strcasecompare(connssl->hostname, check->name) &&
409 ((!cf->conn->bits.conn_to_host && !check->conn_to_host) ||
410 (cf->conn->bits.conn_to_host && check->conn_to_host &&
411 strcasecompare(cf->conn->conn_to_host.name, check->conn_to_host))) &&
412 ((!cf->conn->bits.conn_to_port && check->conn_to_port == -1) ||
413 (cf->conn->bits.conn_to_port && check->conn_to_port != -1 &&
414 cf->conn->conn_to_port == check->conn_to_port)) &&
415 (connssl->port == check->remote_port) &&
416 strcasecompare(cf->conn->handler->scheme, check->scheme) &&
417 Curl_ssl_config_matches(conn_config, &check->ssl_config)) {
418 /* yes, we have a session ID! */
419 (*general_age)++; /* increase general age */
420 check->age = *general_age; /* set this as used in this age */
421 *ssl_sessionid = check->sessionid;
422 if(idsize)
423 *idsize = check->idsize;
424 no_match = FALSE;
425 break;
426 }
427 }
428
429 DEBUGF(infof(data, DMSG(data, "%s Session ID in cache for %s %s://%s:%d"),
430 no_match? "Didn't find": "Found",
431 Curl_ssl_cf_is_proxy(cf) ? "proxy" : "host",
432 cf->conn->handler->scheme, connssl->hostname, connssl->port));
433 return no_match;
434 }
435
436 /*
437 * Kill a single session ID entry in the cache.
438 */
Curl_ssl_kill_session(struct Curl_ssl_session * session)439 void Curl_ssl_kill_session(struct Curl_ssl_session *session)
440 {
441 if(session->sessionid) {
442 /* defensive check */
443
444 /* free the ID the SSL-layer specific way */
445 Curl_ssl->session_free(session->sessionid);
446
447 session->sessionid = NULL;
448 session->age = 0; /* fresh */
449
450 Curl_free_primary_ssl_config(&session->ssl_config);
451
452 Curl_safefree(session->name);
453 Curl_safefree(session->conn_to_host);
454 }
455 }
456
457 /*
458 * Delete the given session ID from the cache.
459 */
Curl_ssl_delsessionid(struct Curl_easy * data,void * ssl_sessionid)460 void Curl_ssl_delsessionid(struct Curl_easy *data, void *ssl_sessionid)
461 {
462 size_t i;
463
464 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
465 struct Curl_ssl_session *check = &data->state.session[i];
466
467 if(check->sessionid == ssl_sessionid) {
468 Curl_ssl_kill_session(check);
469 break;
470 }
471 }
472 }
473
474 /*
475 * Store session id in the session cache. The ID passed on to this function
476 * must already have been extracted and allocated the proper way for the SSL
477 * layer. Curl_XXXX_session_free() will be called to free/kill the session ID
478 * later on.
479 */
Curl_ssl_addsessionid(struct Curl_cfilter * cf,struct Curl_easy * data,void * ssl_sessionid,size_t idsize,bool * added)480 CURLcode Curl_ssl_addsessionid(struct Curl_cfilter *cf,
481 struct Curl_easy *data,
482 void *ssl_sessionid,
483 size_t idsize,
484 bool *added)
485 {
486 struct ssl_connect_data *connssl = cf->ctx;
487 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
488 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
489 size_t i;
490 struct Curl_ssl_session *store;
491 long oldest_age;
492 char *clone_host;
493 char *clone_conn_to_host;
494 int conn_to_port;
495 long *general_age;
496
497 if(added)
498 *added = FALSE;
499
500 if(!data->state.session)
501 return CURLE_OK;
502
503 store = &data->state.session[0];
504 oldest_age = data->state.session[0].age; /* zero if unused */
505 (void)ssl_config;
506 DEBUGASSERT(ssl_config->primary.sessionid);
507
508 clone_host = strdup(connssl->hostname);
509 if(!clone_host)
510 return CURLE_OUT_OF_MEMORY; /* bail out */
511
512 if(cf->conn->bits.conn_to_host) {
513 clone_conn_to_host = strdup(cf->conn->conn_to_host.name);
514 if(!clone_conn_to_host) {
515 free(clone_host);
516 return CURLE_OUT_OF_MEMORY; /* bail out */
517 }
518 }
519 else
520 clone_conn_to_host = NULL;
521
522 if(cf->conn->bits.conn_to_port)
523 conn_to_port = cf->conn->conn_to_port;
524 else
525 conn_to_port = -1;
526
527 /* Now we should add the session ID and the host name to the cache, (remove
528 the oldest if necessary) */
529
530 /* If using shared SSL session, lock! */
531 if(SSLSESSION_SHARED(data)) {
532 general_age = &data->share->sessionage;
533 }
534 else {
535 general_age = &data->state.sessionage;
536 }
537
538 /* find an empty slot for us, or find the oldest */
539 for(i = 1; (i < data->set.general_ssl.max_ssl_sessions) &&
540 data->state.session[i].sessionid; i++) {
541 if(data->state.session[i].age < oldest_age) {
542 oldest_age = data->state.session[i].age;
543 store = &data->state.session[i];
544 }
545 }
546 if(i == data->set.general_ssl.max_ssl_sessions)
547 /* cache is full, we must "kill" the oldest entry! */
548 Curl_ssl_kill_session(store);
549 else
550 store = &data->state.session[i]; /* use this slot */
551
552 /* now init the session struct wisely */
553 store->sessionid = ssl_sessionid;
554 store->idsize = idsize;
555 store->age = *general_age; /* set current age */
556 /* free it if there's one already present */
557 free(store->name);
558 free(store->conn_to_host);
559 store->name = clone_host; /* clone host name */
560 store->conn_to_host = clone_conn_to_host; /* clone connect to host name */
561 store->conn_to_port = conn_to_port; /* connect to port number */
562 /* port number */
563 store->remote_port = connssl->port;
564 store->scheme = cf->conn->handler->scheme;
565
566 if(!Curl_clone_primary_ssl_config(conn_config, &store->ssl_config)) {
567 Curl_free_primary_ssl_config(&store->ssl_config);
568 store->sessionid = NULL; /* let caller free sessionid */
569 free(clone_host);
570 free(clone_conn_to_host);
571 return CURLE_OUT_OF_MEMORY;
572 }
573
574 if(added)
575 *added = TRUE;
576
577 DEBUGF(infof(data, DMSG(data, "Added Session ID to cache for %s://%s:%d"
578 " [%s]"), store->scheme, store->name, store->remote_port,
579 Curl_ssl_cf_is_proxy(cf) ? "PROXY" : "server"));
580 return CURLE_OK;
581 }
582
Curl_free_multi_ssl_backend_data(struct multi_ssl_backend_data * mbackend)583 void Curl_free_multi_ssl_backend_data(struct multi_ssl_backend_data *mbackend)
584 {
585 if(Curl_ssl->free_multi_ssl_backend_data && mbackend)
586 Curl_ssl->free_multi_ssl_backend_data(mbackend);
587 }
588
Curl_ssl_close_all(struct Curl_easy * data)589 void Curl_ssl_close_all(struct Curl_easy *data)
590 {
591 /* kill the session ID cache if not shared */
592 if(data->state.session && !SSLSESSION_SHARED(data)) {
593 size_t i;
594 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++)
595 /* the single-killer function handles empty table slots */
596 Curl_ssl_kill_session(&data->state.session[i]);
597
598 /* free the cache data */
599 Curl_safefree(data->state.session);
600 }
601
602 Curl_ssl->close_all(data);
603 }
604
Curl_ssl_get_select_socks(struct Curl_cfilter * cf,struct Curl_easy * data,curl_socket_t * socks)605 int Curl_ssl_get_select_socks(struct Curl_cfilter *cf, struct Curl_easy *data,
606 curl_socket_t *socks)
607 {
608 struct ssl_connect_data *connssl = cf->ctx;
609 curl_socket_t sock = Curl_conn_cf_get_socket(cf->next, data);
610
611 if(sock != CURL_SOCKET_BAD) {
612 if(connssl->connecting_state == ssl_connect_2_writing) {
613 /* write mode */
614 socks[0] = sock;
615 return GETSOCK_WRITESOCK(0);
616 }
617 if(connssl->connecting_state == ssl_connect_2_reading) {
618 /* read mode */
619 socks[0] = sock;
620 return GETSOCK_READSOCK(0);
621 }
622 }
623 return GETSOCK_BLANK;
624 }
625
626 /* Selects an SSL crypto engine
627 */
Curl_ssl_set_engine(struct Curl_easy * data,const char * engine)628 CURLcode Curl_ssl_set_engine(struct Curl_easy *data, const char *engine)
629 {
630 return Curl_ssl->set_engine(data, engine);
631 }
632
633 /* Selects the default SSL crypto engine
634 */
Curl_ssl_set_engine_default(struct Curl_easy * data)635 CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data)
636 {
637 return Curl_ssl->set_engine_default(data);
638 }
639
640 /* Return list of OpenSSL crypto engine names. */
Curl_ssl_engines_list(struct Curl_easy * data)641 struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data)
642 {
643 return Curl_ssl->engines_list(data);
644 }
645
646 /*
647 * This sets up a session ID cache to the specified size. Make sure this code
648 * is agnostic to what underlying SSL technology we use.
649 */
Curl_ssl_initsessions(struct Curl_easy * data,size_t amount)650 CURLcode Curl_ssl_initsessions(struct Curl_easy *data, size_t amount)
651 {
652 struct Curl_ssl_session *session;
653
654 if(data->state.session)
655 /* this is just a precaution to prevent multiple inits */
656 return CURLE_OK;
657
658 session = calloc(amount, sizeof(struct Curl_ssl_session));
659 if(!session)
660 return CURLE_OUT_OF_MEMORY;
661
662 /* store the info in the SSL section */
663 data->set.general_ssl.max_ssl_sessions = amount;
664 data->state.session = session;
665 data->state.sessionage = 1; /* this is brand new */
666 return CURLE_OK;
667 }
668
669 static size_t multissl_version(char *buffer, size_t size);
670
Curl_ssl_version(char * buffer,size_t size)671 void Curl_ssl_version(char *buffer, size_t size)
672 {
673 #ifdef CURL_WITH_MULTI_SSL
674 (void)multissl_version(buffer, size);
675 #else
676 (void)Curl_ssl->version(buffer, size);
677 #endif
678 }
679
Curl_ssl_free_certinfo(struct Curl_easy * data)680 void Curl_ssl_free_certinfo(struct Curl_easy *data)
681 {
682 struct curl_certinfo *ci = &data->info.certs;
683
684 if(ci->num_of_certs) {
685 /* free all individual lists used */
686 int i;
687 for(i = 0; i<ci->num_of_certs; i++) {
688 curl_slist_free_all(ci->certinfo[i]);
689 ci->certinfo[i] = NULL;
690 }
691
692 free(ci->certinfo); /* free the actual array too */
693 ci->certinfo = NULL;
694 ci->num_of_certs = 0;
695 }
696 }
697
Curl_ssl_init_certinfo(struct Curl_easy * data,int num)698 CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num)
699 {
700 struct curl_certinfo *ci = &data->info.certs;
701 struct curl_slist **table;
702
703 /* Free any previous certificate information structures */
704 Curl_ssl_free_certinfo(data);
705
706 /* Allocate the required certificate information structures */
707 table = calloc((size_t) num, sizeof(struct curl_slist *));
708 if(!table)
709 return CURLE_OUT_OF_MEMORY;
710
711 ci->num_of_certs = num;
712 ci->certinfo = table;
713
714 return CURLE_OK;
715 }
716
717 /*
718 * 'value' is NOT a null-terminated string
719 */
Curl_ssl_push_certinfo_len(struct Curl_easy * data,int certnum,const char * label,const char * value,size_t valuelen)720 CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data,
721 int certnum,
722 const char *label,
723 const char *value,
724 size_t valuelen)
725 {
726 struct curl_certinfo *ci = &data->info.certs;
727 char *output;
728 struct curl_slist *nl;
729 CURLcode result = CURLE_OK;
730 size_t labellen = strlen(label);
731 size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */
732
733 output = malloc(outlen);
734 if(!output)
735 return CURLE_OUT_OF_MEMORY;
736
737 /* sprintf the label and colon */
738 msnprintf(output, outlen, "%s:", label);
739
740 /* memcpy the value (it might not be null-terminated) */
741 memcpy(&output[labellen + 1], value, valuelen);
742
743 /* null-terminate the output */
744 output[labellen + 1 + valuelen] = 0;
745
746 nl = Curl_slist_append_nodup(ci->certinfo[certnum], output);
747 if(!nl) {
748 free(output);
749 curl_slist_free_all(ci->certinfo[certnum]);
750 result = CURLE_OUT_OF_MEMORY;
751 }
752
753 ci->certinfo[certnum] = nl;
754 return result;
755 }
756
757 /*
758 * This is a convenience function for push_certinfo_len that takes a zero
759 * terminated value.
760 */
Curl_ssl_push_certinfo(struct Curl_easy * data,int certnum,const char * label,const char * value)761 CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data,
762 int certnum,
763 const char *label,
764 const char *value)
765 {
766 size_t valuelen = strlen(value);
767
768 return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen);
769 }
770
Curl_ssl_random(struct Curl_easy * data,unsigned char * entropy,size_t length)771 CURLcode Curl_ssl_random(struct Curl_easy *data,
772 unsigned char *entropy,
773 size_t length)
774 {
775 return Curl_ssl->random(data, entropy, length);
776 }
777
778 /*
779 * Curl_ssl_snihost() converts the input host name to a suitable SNI name put
780 * in data->state.buffer. Returns a pointer to the name (or NULL if a problem)
781 * and stores the new length in 'olen'.
782 *
783 * SNI fields must not have any trailing dot and while RFC 6066 section 3 says
784 * the SNI field is case insensitive, browsers always send the data lowercase
785 * and subsequently there are numerous servers out there that don't work
786 * unless the name is lowercased.
787 */
788
Curl_ssl_snihost(struct Curl_easy * data,const char * host,size_t * olen)789 char *Curl_ssl_snihost(struct Curl_easy *data, const char *host, size_t *olen)
790 {
791 size_t len = strlen(host);
792 if(len && (host[len-1] == '.'))
793 len--;
794 if(len >= data->set.buffer_size)
795 return NULL;
796
797 Curl_strntolower(data->state.buffer, host, len);
798 data->state.buffer[len] = 0;
799 if(olen)
800 *olen = len;
801 return data->state.buffer;
802 }
803
804 /*
805 * Public key pem to der conversion
806 */
807
pubkey_pem_to_der(const char * pem,unsigned char ** der,size_t * der_len)808 static CURLcode pubkey_pem_to_der(const char *pem,
809 unsigned char **der, size_t *der_len)
810 {
811 char *stripped_pem, *begin_pos, *end_pos;
812 size_t pem_count, stripped_pem_count = 0, pem_len;
813 CURLcode result;
814
815 /* if no pem, exit. */
816 if(!pem)
817 return CURLE_BAD_CONTENT_ENCODING;
818
819 begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----");
820 if(!begin_pos)
821 return CURLE_BAD_CONTENT_ENCODING;
822
823 pem_count = begin_pos - pem;
824 /* Invalid if not at beginning AND not directly following \n */
825 if(0 != pem_count && '\n' != pem[pem_count - 1])
826 return CURLE_BAD_CONTENT_ENCODING;
827
828 /* 26 is length of "-----BEGIN PUBLIC KEY-----" */
829 pem_count += 26;
830
831 /* Invalid if not directly following \n */
832 end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----");
833 if(!end_pos)
834 return CURLE_BAD_CONTENT_ENCODING;
835
836 pem_len = end_pos - pem;
837
838 stripped_pem = malloc(pem_len - pem_count + 1);
839 if(!stripped_pem)
840 return CURLE_OUT_OF_MEMORY;
841
842 /*
843 * Here we loop through the pem array one character at a time between the
844 * correct indices, and place each character that is not '\n' or '\r'
845 * into the stripped_pem array, which should represent the raw base64 string
846 */
847 while(pem_count < pem_len) {
848 if('\n' != pem[pem_count] && '\r' != pem[pem_count])
849 stripped_pem[stripped_pem_count++] = pem[pem_count];
850 ++pem_count;
851 }
852 /* Place the null terminator in the correct place */
853 stripped_pem[stripped_pem_count] = '\0';
854
855 result = Curl_base64_decode(stripped_pem, der, der_len);
856
857 Curl_safefree(stripped_pem);
858
859 return result;
860 }
861
862 /*
863 * Generic pinned public key check.
864 */
865
Curl_pin_peer_pubkey(struct Curl_easy * data,const char * pinnedpubkey,const unsigned char * pubkey,size_t pubkeylen)866 CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
867 const char *pinnedpubkey,
868 const unsigned char *pubkey, size_t pubkeylen)
869 {
870 FILE *fp;
871 unsigned char *buf = NULL, *pem_ptr = NULL;
872 CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
873
874 /* if a path wasn't specified, don't pin */
875 if(!pinnedpubkey)
876 return CURLE_OK;
877 if(!pubkey || !pubkeylen)
878 return result;
879
880 /* only do this if pinnedpubkey starts with "sha256//", length 8 */
881 if(strncmp(pinnedpubkey, "sha256//", 8) == 0) {
882 CURLcode encode;
883 size_t encodedlen, pinkeylen;
884 char *encoded, *pinkeycopy, *begin_pos, *end_pos;
885 unsigned char *sha256sumdigest;
886
887 if(!Curl_ssl->sha256sum) {
888 /* without sha256 support, this cannot match */
889 return result;
890 }
891
892 /* compute sha256sum of public key */
893 sha256sumdigest = malloc(CURL_SHA256_DIGEST_LENGTH);
894 if(!sha256sumdigest)
895 return CURLE_OUT_OF_MEMORY;
896 encode = Curl_ssl->sha256sum(pubkey, pubkeylen,
897 sha256sumdigest, CURL_SHA256_DIGEST_LENGTH);
898
899 if(encode != CURLE_OK)
900 return encode;
901
902 encode = Curl_base64_encode((char *)sha256sumdigest,
903 CURL_SHA256_DIGEST_LENGTH, &encoded,
904 &encodedlen);
905 Curl_safefree(sha256sumdigest);
906
907 if(encode)
908 return encode;
909
910 infof(data, " public key hash: sha256//%s", encoded);
911
912 /* it starts with sha256//, copy so we can modify it */
913 pinkeylen = strlen(pinnedpubkey) + 1;
914 pinkeycopy = malloc(pinkeylen);
915 if(!pinkeycopy) {
916 Curl_safefree(encoded);
917 return CURLE_OUT_OF_MEMORY;
918 }
919 memcpy(pinkeycopy, pinnedpubkey, pinkeylen);
920 /* point begin_pos to the copy, and start extracting keys */
921 begin_pos = pinkeycopy;
922 do {
923 end_pos = strstr(begin_pos, ";sha256//");
924 /*
925 * if there is an end_pos, null terminate,
926 * otherwise it'll go to the end of the original string
927 */
928 if(end_pos)
929 end_pos[0] = '\0';
930
931 /* compare base64 sha256 digests, 8 is the length of "sha256//" */
932 if(encodedlen == strlen(begin_pos + 8) &&
933 !memcmp(encoded, begin_pos + 8, encodedlen)) {
934 result = CURLE_OK;
935 break;
936 }
937
938 /*
939 * change back the null-terminator we changed earlier,
940 * and look for next begin
941 */
942 if(end_pos) {
943 end_pos[0] = ';';
944 begin_pos = strstr(end_pos, "sha256//");
945 }
946 } while(end_pos && begin_pos);
947 Curl_safefree(encoded);
948 Curl_safefree(pinkeycopy);
949 return result;
950 }
951
952 fp = fopen(pinnedpubkey, "rb");
953 if(!fp)
954 return result;
955
956 do {
957 long filesize;
958 size_t size, pem_len;
959 CURLcode pem_read;
960
961 /* Determine the file's size */
962 if(fseek(fp, 0, SEEK_END))
963 break;
964 filesize = ftell(fp);
965 if(fseek(fp, 0, SEEK_SET))
966 break;
967 if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE)
968 break;
969
970 /*
971 * if the size of our certificate is bigger than the file
972 * size then it can't match
973 */
974 size = curlx_sotouz((curl_off_t) filesize);
975 if(pubkeylen > size)
976 break;
977
978 /*
979 * Allocate buffer for the pinned key
980 * With 1 additional byte for null terminator in case of PEM key
981 */
982 buf = malloc(size + 1);
983 if(!buf)
984 break;
985
986 /* Returns number of elements read, which should be 1 */
987 if((int) fread(buf, size, 1, fp) != 1)
988 break;
989
990 /* If the sizes are the same, it can't be base64 encoded, must be der */
991 if(pubkeylen == size) {
992 if(!memcmp(pubkey, buf, pubkeylen))
993 result = CURLE_OK;
994 break;
995 }
996
997 /*
998 * Otherwise we will assume it's PEM and try to decode it
999 * after placing null terminator
1000 */
1001 buf[size] = '\0';
1002 pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len);
1003 /* if it wasn't read successfully, exit */
1004 if(pem_read)
1005 break;
1006
1007 /*
1008 * if the size of our certificate doesn't match the size of
1009 * the decoded file, they can't be the same, otherwise compare
1010 */
1011 if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen))
1012 result = CURLE_OK;
1013 } while(0);
1014
1015 Curl_safefree(buf);
1016 Curl_safefree(pem_ptr);
1017 fclose(fp);
1018
1019 return result;
1020 }
1021
1022 /*
1023 * Check whether the SSL backend supports the status_request extension.
1024 */
Curl_ssl_cert_status_request(void)1025 bool Curl_ssl_cert_status_request(void)
1026 {
1027 return Curl_ssl->cert_status_request();
1028 }
1029
1030 /*
1031 * Check whether the SSL backend supports false start.
1032 */
Curl_ssl_false_start(struct Curl_easy * data)1033 bool Curl_ssl_false_start(struct Curl_easy *data)
1034 {
1035 (void)data;
1036 return Curl_ssl->false_start();
1037 }
1038
1039 /*
1040 * Default implementations for unsupported functions.
1041 */
1042
Curl_none_init(void)1043 int Curl_none_init(void)
1044 {
1045 return 1;
1046 }
1047
Curl_none_cleanup(void)1048 void Curl_none_cleanup(void)
1049 { }
1050
Curl_none_shutdown(struct Curl_cfilter * cf UNUSED_PARAM,struct Curl_easy * data UNUSED_PARAM)1051 int Curl_none_shutdown(struct Curl_cfilter *cf UNUSED_PARAM,
1052 struct Curl_easy *data UNUSED_PARAM)
1053 {
1054 (void)data;
1055 (void)cf;
1056 return 0;
1057 }
1058
Curl_none_check_cxn(struct Curl_cfilter * cf,struct Curl_easy * data)1059 int Curl_none_check_cxn(struct Curl_cfilter *cf, struct Curl_easy *data)
1060 {
1061 (void)cf;
1062 (void)data;
1063 return -1;
1064 }
1065
Curl_none_random(struct Curl_easy * data UNUSED_PARAM,unsigned char * entropy UNUSED_PARAM,size_t length UNUSED_PARAM)1066 CURLcode Curl_none_random(struct Curl_easy *data UNUSED_PARAM,
1067 unsigned char *entropy UNUSED_PARAM,
1068 size_t length UNUSED_PARAM)
1069 {
1070 (void)data;
1071 (void)entropy;
1072 (void)length;
1073 return CURLE_NOT_BUILT_IN;
1074 }
1075
Curl_none_close_all(struct Curl_easy * data UNUSED_PARAM)1076 void Curl_none_close_all(struct Curl_easy *data UNUSED_PARAM)
1077 {
1078 (void)data;
1079 }
1080
Curl_none_session_free(void * ptr UNUSED_PARAM)1081 void Curl_none_session_free(void *ptr UNUSED_PARAM)
1082 {
1083 (void)ptr;
1084 }
1085
Curl_none_data_pending(struct Curl_cfilter * cf UNUSED_PARAM,const struct Curl_easy * data UNUSED_PARAM)1086 bool Curl_none_data_pending(struct Curl_cfilter *cf UNUSED_PARAM,
1087 const struct Curl_easy *data UNUSED_PARAM)
1088 {
1089 (void)cf;
1090 (void)data;
1091 return 0;
1092 }
1093
Curl_none_cert_status_request(void)1094 bool Curl_none_cert_status_request(void)
1095 {
1096 return FALSE;
1097 }
1098
Curl_none_set_engine(struct Curl_easy * data UNUSED_PARAM,const char * engine UNUSED_PARAM)1099 CURLcode Curl_none_set_engine(struct Curl_easy *data UNUSED_PARAM,
1100 const char *engine UNUSED_PARAM)
1101 {
1102 (void)data;
1103 (void)engine;
1104 return CURLE_NOT_BUILT_IN;
1105 }
1106
Curl_none_set_engine_default(struct Curl_easy * data UNUSED_PARAM)1107 CURLcode Curl_none_set_engine_default(struct Curl_easy *data UNUSED_PARAM)
1108 {
1109 (void)data;
1110 return CURLE_NOT_BUILT_IN;
1111 }
1112
Curl_none_engines_list(struct Curl_easy * data UNUSED_PARAM)1113 struct curl_slist *Curl_none_engines_list(struct Curl_easy *data UNUSED_PARAM)
1114 {
1115 (void)data;
1116 return (struct curl_slist *)NULL;
1117 }
1118
Curl_none_false_start(void)1119 bool Curl_none_false_start(void)
1120 {
1121 return FALSE;
1122 }
1123
multissl_init(void)1124 static int multissl_init(void)
1125 {
1126 if(multissl_setup(NULL))
1127 return 1;
1128 return Curl_ssl->init();
1129 }
1130
multissl_connect(struct Curl_cfilter * cf,struct Curl_easy * data)1131 static CURLcode multissl_connect(struct Curl_cfilter *cf,
1132 struct Curl_easy *data)
1133 {
1134 if(multissl_setup(NULL))
1135 return CURLE_FAILED_INIT;
1136 return Curl_ssl->connect_blocking(cf, data);
1137 }
1138
multissl_connect_nonblocking(struct Curl_cfilter * cf,struct Curl_easy * data,bool * done)1139 static CURLcode multissl_connect_nonblocking(struct Curl_cfilter *cf,
1140 struct Curl_easy *data,
1141 bool *done)
1142 {
1143 if(multissl_setup(NULL))
1144 return CURLE_FAILED_INIT;
1145 return Curl_ssl->connect_nonblocking(cf, data, done);
1146 }
1147
multissl_get_select_socks(struct Curl_cfilter * cf,struct Curl_easy * data,curl_socket_t * socks)1148 static int multissl_get_select_socks(struct Curl_cfilter *cf,
1149 struct Curl_easy *data,
1150 curl_socket_t *socks)
1151 {
1152 if(multissl_setup(NULL))
1153 return 0;
1154 return Curl_ssl->get_select_socks(cf, data, socks);
1155 }
1156
multissl_get_internals(struct ssl_connect_data * connssl,CURLINFO info)1157 static void *multissl_get_internals(struct ssl_connect_data *connssl,
1158 CURLINFO info)
1159 {
1160 if(multissl_setup(NULL))
1161 return NULL;
1162 return Curl_ssl->get_internals(connssl, info);
1163 }
1164
multissl_close(struct Curl_cfilter * cf,struct Curl_easy * data)1165 static void multissl_close(struct Curl_cfilter *cf, struct Curl_easy *data)
1166 {
1167 if(multissl_setup(NULL))
1168 return;
1169 Curl_ssl->close(cf, data);
1170 }
1171
multissl_recv_plain(struct Curl_cfilter * cf,struct Curl_easy * data,char * buf,size_t len,CURLcode * code)1172 static ssize_t multissl_recv_plain(struct Curl_cfilter *cf,
1173 struct Curl_easy *data,
1174 char *buf, size_t len, CURLcode *code)
1175 {
1176 if(multissl_setup(NULL))
1177 return CURLE_FAILED_INIT;
1178 return Curl_ssl->recv_plain(cf, data, buf, len, code);
1179 }
1180
multissl_send_plain(struct Curl_cfilter * cf,struct Curl_easy * data,const void * mem,size_t len,CURLcode * code)1181 static ssize_t multissl_send_plain(struct Curl_cfilter *cf,
1182 struct Curl_easy *data,
1183 const void *mem, size_t len,
1184 CURLcode *code)
1185 {
1186 if(multissl_setup(NULL))
1187 return CURLE_FAILED_INIT;
1188 return Curl_ssl->send_plain(cf, data, mem, len, code);
1189 }
1190
1191 static const struct Curl_ssl Curl_ssl_multi = {
1192 { CURLSSLBACKEND_NONE, "multi" }, /* info */
1193 0, /* supports nothing */
1194 (size_t)-1, /* something insanely large to be on the safe side */
1195
1196 multissl_init, /* init */
1197 Curl_none_cleanup, /* cleanup */
1198 multissl_version, /* version */
1199 Curl_none_check_cxn, /* check_cxn */
1200 Curl_none_shutdown, /* shutdown */
1201 Curl_none_data_pending, /* data_pending */
1202 Curl_none_random, /* random */
1203 Curl_none_cert_status_request, /* cert_status_request */
1204 multissl_connect, /* connect */
1205 multissl_connect_nonblocking, /* connect_nonblocking */
1206 multissl_get_select_socks, /* getsock */
1207 multissl_get_internals, /* get_internals */
1208 multissl_close, /* close_one */
1209 Curl_none_close_all, /* close_all */
1210 Curl_none_session_free, /* session_free */
1211 Curl_none_set_engine, /* set_engine */
1212 Curl_none_set_engine_default, /* set_engine_default */
1213 Curl_none_engines_list, /* engines_list */
1214 Curl_none_false_start, /* false_start */
1215 NULL, /* sha256sum */
1216 NULL, /* associate_connection */
1217 NULL, /* disassociate_connection */
1218 NULL, /* free_multi_ssl_backend_data */
1219 multissl_recv_plain, /* recv decrypted data */
1220 multissl_send_plain, /* send data to encrypt */
1221 };
1222
1223 const struct Curl_ssl *Curl_ssl =
1224 #if defined(CURL_WITH_MULTI_SSL)
1225 &Curl_ssl_multi;
1226 #elif defined(USE_WOLFSSL)
1227 &Curl_ssl_wolfssl;
1228 #elif defined(USE_SECTRANSP)
1229 &Curl_ssl_sectransp;
1230 #elif defined(USE_GNUTLS)
1231 &Curl_ssl_gnutls;
1232 #elif defined(USE_GSKIT)
1233 &Curl_ssl_gskit;
1234 #elif defined(USE_MBEDTLS)
1235 &Curl_ssl_mbedtls;
1236 #elif defined(USE_NSS)
1237 &Curl_ssl_nss;
1238 #elif defined(USE_RUSTLS)
1239 &Curl_ssl_rustls;
1240 #elif defined(USE_OPENSSL)
1241 &Curl_ssl_openssl;
1242 #elif defined(USE_SCHANNEL)
1243 &Curl_ssl_schannel;
1244 #elif defined(USE_BEARSSL)
1245 &Curl_ssl_bearssl;
1246 #else
1247 #error "Missing struct Curl_ssl for selected SSL backend"
1248 #endif
1249
1250 static const struct Curl_ssl *available_backends[] = {
1251 #if defined(USE_WOLFSSL)
1252 &Curl_ssl_wolfssl,
1253 #endif
1254 #if defined(USE_SECTRANSP)
1255 &Curl_ssl_sectransp,
1256 #endif
1257 #if defined(USE_GNUTLS)
1258 &Curl_ssl_gnutls,
1259 #endif
1260 #if defined(USE_GSKIT)
1261 &Curl_ssl_gskit,
1262 #endif
1263 #if defined(USE_MBEDTLS)
1264 &Curl_ssl_mbedtls,
1265 #endif
1266 #if defined(USE_NSS)
1267 &Curl_ssl_nss,
1268 #endif
1269 #if defined(USE_OPENSSL)
1270 &Curl_ssl_openssl,
1271 #endif
1272 #if defined(USE_SCHANNEL)
1273 &Curl_ssl_schannel,
1274 #endif
1275 #if defined(USE_BEARSSL)
1276 &Curl_ssl_bearssl,
1277 #endif
1278 #if defined(USE_RUSTLS)
1279 &Curl_ssl_rustls,
1280 #endif
1281 NULL
1282 };
1283
multissl_version(char * buffer,size_t size)1284 static size_t multissl_version(char *buffer, size_t size)
1285 {
1286 static const struct Curl_ssl *selected;
1287 static char backends[200];
1288 static size_t backends_len;
1289 const struct Curl_ssl *current;
1290
1291 current = Curl_ssl == &Curl_ssl_multi ? available_backends[0] : Curl_ssl;
1292
1293 if(current != selected) {
1294 char *p = backends;
1295 char *end = backends + sizeof(backends);
1296 int i;
1297
1298 selected = current;
1299
1300 backends[0] = '\0';
1301
1302 for(i = 0; available_backends[i]; ++i) {
1303 char vb[200];
1304 bool paren = (selected != available_backends[i]);
1305
1306 if(available_backends[i]->version(vb, sizeof(vb))) {
1307 p += msnprintf(p, end - p, "%s%s%s%s", (p != backends ? " " : ""),
1308 (paren ? "(" : ""), vb, (paren ? ")" : ""));
1309 }
1310 }
1311
1312 backends_len = p - backends;
1313 }
1314
1315 if(!size)
1316 return 0;
1317
1318 if(size <= backends_len) {
1319 strncpy(buffer, backends, size - 1);
1320 buffer[size - 1] = '\0';
1321 return size - 1;
1322 }
1323
1324 strcpy(buffer, backends);
1325 return backends_len;
1326 }
1327
multissl_setup(const struct Curl_ssl * backend)1328 static int multissl_setup(const struct Curl_ssl *backend)
1329 {
1330 const char *env;
1331 char *env_tmp;
1332
1333 if(Curl_ssl != &Curl_ssl_multi)
1334 return 1;
1335
1336 if(backend) {
1337 Curl_ssl = backend;
1338 return 0;
1339 }
1340
1341 if(!available_backends[0])
1342 return 1;
1343
1344 env = env_tmp = curl_getenv("CURL_SSL_BACKEND");
1345 #ifdef CURL_DEFAULT_SSL_BACKEND
1346 if(!env)
1347 env = CURL_DEFAULT_SSL_BACKEND;
1348 #endif
1349 if(env) {
1350 int i;
1351 for(i = 0; available_backends[i]; i++) {
1352 if(strcasecompare(env, available_backends[i]->info.name)) {
1353 Curl_ssl = available_backends[i];
1354 free(env_tmp);
1355 return 0;
1356 }
1357 }
1358 }
1359
1360 /* Fall back to first available backend */
1361 Curl_ssl = available_backends[0];
1362 free(env_tmp);
1363 return 0;
1364 }
1365
1366 /* This function is used to select the SSL backend to use. It is called by
1367 curl_global_sslset (easy.c) which uses the global init lock. */
Curl_init_sslset_nolock(curl_sslbackend id,const char * name,const curl_ssl_backend *** avail)1368 CURLsslset Curl_init_sslset_nolock(curl_sslbackend id, const char *name,
1369 const curl_ssl_backend ***avail)
1370 {
1371 int i;
1372
1373 if(avail)
1374 *avail = (const curl_ssl_backend **)&available_backends;
1375
1376 if(Curl_ssl != &Curl_ssl_multi)
1377 return id == Curl_ssl->info.id ||
1378 (name && strcasecompare(name, Curl_ssl->info.name)) ?
1379 CURLSSLSET_OK :
1380 #if defined(CURL_WITH_MULTI_SSL)
1381 CURLSSLSET_TOO_LATE;
1382 #else
1383 CURLSSLSET_UNKNOWN_BACKEND;
1384 #endif
1385
1386 for(i = 0; available_backends[i]; i++) {
1387 if(available_backends[i]->info.id == id ||
1388 (name && strcasecompare(available_backends[i]->info.name, name))) {
1389 multissl_setup(available_backends[i]);
1390 return CURLSSLSET_OK;
1391 }
1392 }
1393
1394 return CURLSSLSET_UNKNOWN_BACKEND;
1395 }
1396
1397 #else /* USE_SSL */
Curl_init_sslset_nolock(curl_sslbackend id,const char * name,const curl_ssl_backend *** avail)1398 CURLsslset Curl_init_sslset_nolock(curl_sslbackend id, const char *name,
1399 const curl_ssl_backend ***avail)
1400 {
1401 (void)id;
1402 (void)name;
1403 (void)avail;
1404 return CURLSSLSET_NO_BACKENDS;
1405 }
1406
1407 #endif /* !USE_SSL */
1408
1409 #ifdef USE_SSL
1410
free_hostname(struct ssl_connect_data * connssl)1411 static void free_hostname(struct ssl_connect_data *connssl)
1412 {
1413 if(connssl->dispname != connssl->hostname)
1414 free(connssl->dispname);
1415 free(connssl->hostname);
1416 connssl->hostname = connssl->dispname = NULL;
1417 }
1418
cf_close(struct Curl_cfilter * cf,struct Curl_easy * data)1419 static void cf_close(struct Curl_cfilter *cf, struct Curl_easy *data)
1420 {
1421 struct ssl_connect_data *connssl = cf->ctx;
1422 if(connssl) {
1423 Curl_ssl->close(cf, data);
1424 connssl->state = ssl_connection_none;
1425 free_hostname(connssl);
1426 }
1427 cf->connected = FALSE;
1428 }
1429
reinit_hostname(struct Curl_cfilter * cf)1430 static CURLcode reinit_hostname(struct Curl_cfilter *cf)
1431 {
1432 struct ssl_connect_data *connssl = cf->ctx;
1433 const char *ehostname, *edispname;
1434 int eport;
1435
1436 /* We need the hostname for SNI negotiation. Once handshaked, this
1437 * remains the SNI hostname for the TLS connection. But when the
1438 * connection is reused, the settings in cf->conn might change.
1439 * So we keep a copy of the hostname we use for SNI.
1440 */
1441 #ifndef CURL_DISABLE_PROXY
1442 if(Curl_ssl_cf_is_proxy(cf)) {
1443 ehostname = cf->conn->http_proxy.host.name;
1444 edispname = cf->conn->http_proxy.host.dispname;
1445 eport = cf->conn->http_proxy.port;
1446 }
1447 else
1448 #endif
1449 {
1450 ehostname = cf->conn->host.name;
1451 edispname = cf->conn->host.dispname;
1452 eport = cf->conn->remote_port;
1453 }
1454
1455 /* change if ehostname changed */
1456 if(ehostname && (!connssl->hostname
1457 || strcmp(ehostname, connssl->hostname))) {
1458 free_hostname(connssl);
1459 connssl->hostname = strdup(ehostname);
1460 if(!connssl->hostname) {
1461 free_hostname(connssl);
1462 return CURLE_OUT_OF_MEMORY;
1463 }
1464 if(!edispname || !strcmp(ehostname, edispname))
1465 connssl->dispname = connssl->hostname;
1466 else {
1467 connssl->dispname = strdup(edispname);
1468 if(!connssl->dispname) {
1469 free_hostname(connssl);
1470 return CURLE_OUT_OF_MEMORY;
1471 }
1472 }
1473 }
1474 connssl->port = eport;
1475 return CURLE_OK;
1476 }
1477
ssl_cf_destroy(struct Curl_cfilter * cf,struct Curl_easy * data)1478 static void ssl_cf_destroy(struct Curl_cfilter *cf, struct Curl_easy *data)
1479 {
1480 struct cf_call_data save;
1481
1482 CF_DATA_SAVE(save, cf, data);
1483 cf_close(cf, data);
1484 CF_DATA_RESTORE(cf, save);
1485 cf_ctx_free(cf->ctx);
1486 cf->ctx = NULL;
1487 }
1488
ssl_cf_close(struct Curl_cfilter * cf,struct Curl_easy * data)1489 static void ssl_cf_close(struct Curl_cfilter *cf,
1490 struct Curl_easy *data)
1491 {
1492 struct cf_call_data save;
1493
1494 CF_DATA_SAVE(save, cf, data);
1495 cf_close(cf, data);
1496 cf->next->cft->close(cf->next, data);
1497 CF_DATA_RESTORE(cf, save);
1498 }
1499
ssl_cf_connect(struct Curl_cfilter * cf,struct Curl_easy * data,bool blocking,bool * done)1500 static CURLcode ssl_cf_connect(struct Curl_cfilter *cf,
1501 struct Curl_easy *data,
1502 bool blocking, bool *done)
1503 {
1504 struct ssl_connect_data *connssl = cf->ctx;
1505 struct cf_call_data save;
1506 CURLcode result;
1507
1508 if(cf->connected) {
1509 *done = TRUE;
1510 return CURLE_OK;
1511 }
1512
1513 CF_DATA_SAVE(save, cf, data);
1514 (void)connssl;
1515 DEBUGASSERT(data->conn);
1516 DEBUGASSERT(data->conn == cf->conn);
1517 DEBUGASSERT(connssl);
1518 DEBUGASSERT(cf->conn->host.name);
1519
1520 result = cf->next->cft->connect(cf->next, data, blocking, done);
1521 if(result || !*done)
1522 goto out;
1523
1524 *done = FALSE;
1525 result = reinit_hostname(cf);
1526 if(result)
1527 goto out;
1528
1529 if(blocking) {
1530 result = ssl_connect(cf, data);
1531 *done = (result == CURLE_OK);
1532 }
1533 else {
1534 result = ssl_connect_nonblocking(cf, data, done);
1535 }
1536
1537 if(!result && *done) {
1538 cf->connected = TRUE;
1539 connssl->handshake_done = Curl_now();
1540 DEBUGASSERT(connssl->state == ssl_connection_complete);
1541 }
1542 out:
1543 CF_DATA_RESTORE(cf, save);
1544 return result;
1545 }
1546
ssl_cf_data_pending(struct Curl_cfilter * cf,const struct Curl_easy * data)1547 static bool ssl_cf_data_pending(struct Curl_cfilter *cf,
1548 const struct Curl_easy *data)
1549 {
1550 struct cf_call_data save;
1551 bool result;
1552
1553 CF_DATA_SAVE(save, cf, data);
1554 if(Curl_ssl->data_pending(cf, data))
1555 result = TRUE;
1556 else
1557 result = cf->next->cft->has_data_pending(cf->next, data);
1558 CF_DATA_RESTORE(cf, save);
1559 return result;
1560 }
1561
ssl_cf_send(struct Curl_cfilter * cf,struct Curl_easy * data,const void * buf,size_t len,CURLcode * err)1562 static ssize_t ssl_cf_send(struct Curl_cfilter *cf,
1563 struct Curl_easy *data, const void *buf, size_t len,
1564 CURLcode *err)
1565 {
1566 struct cf_call_data save;
1567 ssize_t nwritten;
1568
1569 CF_DATA_SAVE(save, cf, data);
1570 *err = CURLE_OK;
1571 nwritten = Curl_ssl->send_plain(cf, data, buf, len, err);
1572 CF_DATA_RESTORE(cf, save);
1573 return nwritten;
1574 }
1575
ssl_cf_recv(struct Curl_cfilter * cf,struct Curl_easy * data,char * buf,size_t len,CURLcode * err)1576 static ssize_t ssl_cf_recv(struct Curl_cfilter *cf,
1577 struct Curl_easy *data, char *buf, size_t len,
1578 CURLcode *err)
1579 {
1580 struct cf_call_data save;
1581 ssize_t nread;
1582
1583 CF_DATA_SAVE(save, cf, data);
1584 *err = CURLE_OK;
1585 nread = Curl_ssl->recv_plain(cf, data, buf, len, err);
1586 CF_DATA_RESTORE(cf, save);
1587 return nread;
1588 }
1589
ssl_cf_get_select_socks(struct Curl_cfilter * cf,struct Curl_easy * data,curl_socket_t * socks)1590 static int ssl_cf_get_select_socks(struct Curl_cfilter *cf,
1591 struct Curl_easy *data,
1592 curl_socket_t *socks)
1593 {
1594 struct cf_call_data save;
1595 int result;
1596
1597 CF_DATA_SAVE(save, cf, data);
1598 result = Curl_ssl->get_select_socks(cf, data, socks);
1599 CF_DATA_RESTORE(cf, save);
1600 return result;
1601 }
1602
ssl_cf_cntrl(struct Curl_cfilter * cf,struct Curl_easy * data,int event,int arg1,void * arg2)1603 static CURLcode ssl_cf_cntrl(struct Curl_cfilter *cf,
1604 struct Curl_easy *data,
1605 int event, int arg1, void *arg2)
1606 {
1607 struct cf_call_data save;
1608
1609 (void)arg1;
1610 (void)arg2;
1611 switch(event) {
1612 case CF_CTRL_DATA_ATTACH:
1613 if(Curl_ssl->attach_data) {
1614 CF_DATA_SAVE(save, cf, data);
1615 Curl_ssl->attach_data(cf, data);
1616 CF_DATA_RESTORE(cf, save);
1617 }
1618 break;
1619 case CF_CTRL_DATA_DETACH:
1620 if(Curl_ssl->detach_data) {
1621 CF_DATA_SAVE(save, cf, data);
1622 Curl_ssl->detach_data(cf, data);
1623 CF_DATA_RESTORE(cf, save);
1624 }
1625 break;
1626 default:
1627 break;
1628 }
1629 return CURLE_OK;
1630 }
1631
ssl_cf_query(struct Curl_cfilter * cf,struct Curl_easy * data,int query,int * pres1,void * pres2)1632 static CURLcode ssl_cf_query(struct Curl_cfilter *cf,
1633 struct Curl_easy *data,
1634 int query, int *pres1, void *pres2)
1635 {
1636 struct ssl_connect_data *connssl = cf->ctx;
1637
1638 switch(query) {
1639 case CF_QUERY_TIMER_APPCONNECT: {
1640 struct curltime *when = pres2;
1641 if(cf->connected && !Curl_ssl_cf_is_proxy(cf))
1642 *when = connssl->handshake_done;
1643 return CURLE_OK;
1644 }
1645 default:
1646 break;
1647 }
1648 return cf->next?
1649 cf->next->cft->query(cf->next, data, query, pres1, pres2) :
1650 CURLE_UNKNOWN_OPTION;
1651 }
1652
cf_ssl_is_alive(struct Curl_cfilter * cf,struct Curl_easy * data,bool * input_pending)1653 static bool cf_ssl_is_alive(struct Curl_cfilter *cf, struct Curl_easy *data,
1654 bool *input_pending)
1655 {
1656 struct cf_call_data save;
1657 int result;
1658 /*
1659 * This function tries to determine connection status.
1660 *
1661 * Return codes:
1662 * 1 means the connection is still in place
1663 * 0 means the connection has been closed
1664 * -1 means the connection status is unknown
1665 */
1666 CF_DATA_SAVE(save, cf, data);
1667 result = Curl_ssl->check_cxn(cf, data);
1668 CF_DATA_RESTORE(cf, save);
1669 if(result > 0) {
1670 *input_pending = TRUE;
1671 return TRUE;
1672 }
1673 if(result == 0) {
1674 *input_pending = FALSE;
1675 return FALSE;
1676 }
1677 /* ssl backend does not know */
1678 return cf->next?
1679 cf->next->cft->is_alive(cf->next, data, input_pending) :
1680 FALSE; /* pessimistic in absence of data */
1681 }
1682
1683 struct Curl_cftype Curl_cft_ssl = {
1684 "SSL",
1685 CF_TYPE_SSL,
1686 CURL_LOG_DEFAULT,
1687 ssl_cf_destroy,
1688 ssl_cf_connect,
1689 ssl_cf_close,
1690 Curl_cf_def_get_host,
1691 ssl_cf_get_select_socks,
1692 ssl_cf_data_pending,
1693 ssl_cf_send,
1694 ssl_cf_recv,
1695 ssl_cf_cntrl,
1696 cf_ssl_is_alive,
1697 Curl_cf_def_conn_keep_alive,
1698 ssl_cf_query,
1699 };
1700
1701 struct Curl_cftype Curl_cft_ssl_proxy = {
1702 "SSL-PROXY",
1703 CF_TYPE_SSL,
1704 CURL_LOG_DEFAULT,
1705 ssl_cf_destroy,
1706 ssl_cf_connect,
1707 ssl_cf_close,
1708 Curl_cf_def_get_host,
1709 ssl_cf_get_select_socks,
1710 ssl_cf_data_pending,
1711 ssl_cf_send,
1712 ssl_cf_recv,
1713 ssl_cf_cntrl,
1714 cf_ssl_is_alive,
1715 Curl_cf_def_conn_keep_alive,
1716 Curl_cf_def_query,
1717 };
1718
cf_ssl_create(struct Curl_cfilter ** pcf,struct Curl_easy * data,struct connectdata * conn)1719 static CURLcode cf_ssl_create(struct Curl_cfilter **pcf,
1720 struct Curl_easy *data,
1721 struct connectdata *conn)
1722 {
1723 struct Curl_cfilter *cf = NULL;
1724 struct ssl_connect_data *ctx;
1725 CURLcode result;
1726
1727 DEBUGASSERT(data->conn);
1728
1729 ctx = cf_ctx_new(data, Curl_alpn_get_spec(data, conn));
1730 if(!ctx) {
1731 result = CURLE_OUT_OF_MEMORY;
1732 goto out;
1733 }
1734
1735 result = Curl_cf_create(&cf, &Curl_cft_ssl, ctx);
1736
1737 out:
1738 if(result)
1739 cf_ctx_free(ctx);
1740 *pcf = result? NULL : cf;
1741 return result;
1742 }
1743
Curl_ssl_cfilter_add(struct Curl_easy * data,struct connectdata * conn,int sockindex)1744 CURLcode Curl_ssl_cfilter_add(struct Curl_easy *data,
1745 struct connectdata *conn,
1746 int sockindex)
1747 {
1748 struct Curl_cfilter *cf;
1749 CURLcode result;
1750
1751 result = cf_ssl_create(&cf, data, conn);
1752 if(!result)
1753 Curl_conn_cf_add(data, conn, sockindex, cf);
1754 return result;
1755 }
1756
Curl_cf_ssl_insert_after(struct Curl_cfilter * cf_at,struct Curl_easy * data)1757 CURLcode Curl_cf_ssl_insert_after(struct Curl_cfilter *cf_at,
1758 struct Curl_easy *data)
1759 {
1760 struct Curl_cfilter *cf;
1761 CURLcode result;
1762
1763 result = cf_ssl_create(&cf, data, cf_at->conn);
1764 if(!result)
1765 Curl_conn_cf_insert_after(cf_at, cf);
1766 return result;
1767 }
1768
1769 #ifndef CURL_DISABLE_PROXY
cf_ssl_proxy_create(struct Curl_cfilter ** pcf,struct Curl_easy * data,struct connectdata * conn)1770 static CURLcode cf_ssl_proxy_create(struct Curl_cfilter **pcf,
1771 struct Curl_easy *data,
1772 struct connectdata *conn)
1773 {
1774 struct Curl_cfilter *cf = NULL;
1775 struct ssl_connect_data *ctx;
1776 CURLcode result;
1777
1778 ctx = cf_ctx_new(data, Curl_alpn_get_proxy_spec(data, conn));
1779 if(!ctx) {
1780 result = CURLE_OUT_OF_MEMORY;
1781 goto out;
1782 }
1783 result = Curl_cf_create(&cf, &Curl_cft_ssl_proxy, ctx);
1784
1785 out:
1786 if(result)
1787 cf_ctx_free(ctx);
1788 *pcf = result? NULL : cf;
1789 return result;
1790 }
1791
Curl_ssl_cfilter_proxy_add(struct Curl_easy * data,struct connectdata * conn,int sockindex)1792 CURLcode Curl_ssl_cfilter_proxy_add(struct Curl_easy *data,
1793 struct connectdata *conn,
1794 int sockindex)
1795 {
1796 struct Curl_cfilter *cf;
1797 CURLcode result;
1798
1799 result = cf_ssl_proxy_create(&cf, data, conn);
1800 if(!result)
1801 Curl_conn_cf_add(data, conn, sockindex, cf);
1802 return result;
1803 }
1804
Curl_cf_ssl_proxy_insert_after(struct Curl_cfilter * cf_at,struct Curl_easy * data)1805 CURLcode Curl_cf_ssl_proxy_insert_after(struct Curl_cfilter *cf_at,
1806 struct Curl_easy *data)
1807 {
1808 struct Curl_cfilter *cf;
1809 CURLcode result;
1810
1811 result = cf_ssl_proxy_create(&cf, data, cf_at->conn);
1812 if(!result)
1813 Curl_conn_cf_insert_after(cf_at, cf);
1814 return result;
1815 }
1816
1817 #endif /* !CURL_DISABLE_PROXY */
1818
Curl_ssl_supports(struct Curl_easy * data,int option)1819 bool Curl_ssl_supports(struct Curl_easy *data, int option)
1820 {
1821 (void)data;
1822 return (Curl_ssl->supports & option)? TRUE : FALSE;
1823 }
1824
Curl_ssl_get_internals(struct Curl_easy * data,int sockindex,CURLINFO info,int n)1825 void *Curl_ssl_get_internals(struct Curl_easy *data, int sockindex,
1826 CURLINFO info, int n)
1827 {
1828 void *result = NULL;
1829 (void)n;
1830 if(data->conn) {
1831 struct Curl_cfilter *cf;
1832 /* get first filter in chain, if any is present */
1833 cf = Curl_ssl_cf_get_ssl(data->conn->cfilter[sockindex]);
1834 if(cf) {
1835 struct cf_call_data save;
1836 CF_DATA_SAVE(save, cf, data);
1837 result = Curl_ssl->get_internals(cf->ctx, info);
1838 CF_DATA_RESTORE(cf, save);
1839 }
1840 }
1841 return result;
1842 }
1843
Curl_ssl_cfilter_remove(struct Curl_easy * data,int sockindex)1844 CURLcode Curl_ssl_cfilter_remove(struct Curl_easy *data,
1845 int sockindex)
1846 {
1847 struct Curl_cfilter *cf = data->conn? data->conn->cfilter[sockindex] : NULL;
1848 CURLcode result = CURLE_OK;
1849
1850 (void)data;
1851 for(; cf; cf = cf->next) {
1852 if(cf->cft == &Curl_cft_ssl) {
1853 if(Curl_ssl->shut_down(cf, data))
1854 result = CURLE_SSL_SHUTDOWN_FAILED;
1855 Curl_conn_cf_discard(cf, data);
1856 break;
1857 }
1858 }
1859 return result;
1860 }
1861
get_ssl_cf_engaged(struct connectdata * conn,int sockindex)1862 static struct Curl_cfilter *get_ssl_cf_engaged(struct connectdata *conn,
1863 int sockindex)
1864 {
1865 struct Curl_cfilter *cf, *lowest_ssl_cf = NULL;
1866
1867 for(cf = conn->cfilter[sockindex]; cf; cf = cf->next) {
1868 if(cf->cft == &Curl_cft_ssl || cf->cft == &Curl_cft_ssl_proxy) {
1869 lowest_ssl_cf = cf;
1870 if(cf->connected || (cf->next && cf->next->connected)) {
1871 /* connected or about to start */
1872 return cf;
1873 }
1874 }
1875 }
1876 return lowest_ssl_cf;
1877 }
1878
Curl_ssl_cf_is_proxy(struct Curl_cfilter * cf)1879 bool Curl_ssl_cf_is_proxy(struct Curl_cfilter *cf)
1880 {
1881 return (cf->cft == &Curl_cft_ssl_proxy);
1882 }
1883
1884 struct ssl_config_data *
Curl_ssl_cf_get_config(struct Curl_cfilter * cf,struct Curl_easy * data)1885 Curl_ssl_cf_get_config(struct Curl_cfilter *cf, struct Curl_easy *data)
1886 {
1887 #ifdef CURL_DISABLE_PROXY
1888 (void)cf;
1889 return &data->set.ssl;
1890 #else
1891 return Curl_ssl_cf_is_proxy(cf)? &data->set.proxy_ssl : &data->set.ssl;
1892 #endif
1893 }
1894
1895 struct ssl_config_data *
Curl_ssl_get_config(struct Curl_easy * data,int sockindex)1896 Curl_ssl_get_config(struct Curl_easy *data, int sockindex)
1897 {
1898 struct Curl_cfilter *cf;
1899
1900 (void)data;
1901 DEBUGASSERT(data->conn);
1902 cf = get_ssl_cf_engaged(data->conn, sockindex);
1903 return cf? Curl_ssl_cf_get_config(cf, data) : &data->set.ssl;
1904 }
1905
1906 struct ssl_primary_config *
Curl_ssl_cf_get_primary_config(struct Curl_cfilter * cf)1907 Curl_ssl_cf_get_primary_config(struct Curl_cfilter *cf)
1908 {
1909 #ifdef CURL_DISABLE_PROXY
1910 return &cf->conn->ssl_config;
1911 #else
1912 return Curl_ssl_cf_is_proxy(cf)?
1913 &cf->conn->proxy_ssl_config : &cf->conn->ssl_config;
1914 #endif
1915 }
1916
1917 struct ssl_primary_config *
Curl_ssl_get_primary_config(struct Curl_easy * data,struct connectdata * conn,int sockindex)1918 Curl_ssl_get_primary_config(struct Curl_easy *data,
1919 struct connectdata *conn,
1920 int sockindex)
1921 {
1922 struct Curl_cfilter *cf;
1923
1924 (void)data;
1925 DEBUGASSERT(conn);
1926 cf = get_ssl_cf_engaged(conn, sockindex);
1927 return cf? Curl_ssl_cf_get_primary_config(cf) : NULL;
1928 }
1929
Curl_ssl_cf_get_ssl(struct Curl_cfilter * cf)1930 struct Curl_cfilter *Curl_ssl_cf_get_ssl(struct Curl_cfilter *cf)
1931 {
1932 for(; cf; cf = cf->next) {
1933 if(cf->cft == &Curl_cft_ssl || cf->cft == &Curl_cft_ssl_proxy)
1934 return cf;
1935 }
1936 return NULL;
1937 }
1938
1939 static const struct alpn_spec ALPN_SPEC_H10 = {
1940 { ALPN_HTTP_1_0 }, 1
1941 };
1942 static const struct alpn_spec ALPN_SPEC_H11 = {
1943 { ALPN_HTTP_1_1 }, 1
1944 };
1945 #ifdef USE_HTTP2
1946 static const struct alpn_spec ALPN_SPEC_H2_H11 = {
1947 { ALPN_H2, ALPN_HTTP_1_1 }, 2
1948 };
1949 #endif
1950
1951 const struct alpn_spec *
Curl_alpn_get_spec(struct Curl_easy * data,struct connectdata * conn)1952 Curl_alpn_get_spec(struct Curl_easy *data, struct connectdata *conn)
1953 {
1954 if(!conn->bits.tls_enable_alpn)
1955 return NULL;
1956 if(data->state.httpwant == CURL_HTTP_VERSION_1_0)
1957 return &ALPN_SPEC_H10;
1958 #ifdef USE_HTTP2
1959 if(data->state.httpwant >= CURL_HTTP_VERSION_2)
1960 return &ALPN_SPEC_H2_H11;
1961 #endif
1962 return &ALPN_SPEC_H11;
1963 }
1964
1965 const struct alpn_spec *
Curl_alpn_get_proxy_spec(struct Curl_easy * data,struct connectdata * conn)1966 Curl_alpn_get_proxy_spec(struct Curl_easy *data, struct connectdata *conn)
1967 {
1968 if(!conn->bits.tls_enable_alpn)
1969 return NULL;
1970 if(data->state.httpwant == CURL_HTTP_VERSION_1_0)
1971 return &ALPN_SPEC_H10;
1972 return &ALPN_SPEC_H11;
1973 }
1974
Curl_alpn_to_proto_buf(struct alpn_proto_buf * buf,const struct alpn_spec * spec)1975 CURLcode Curl_alpn_to_proto_buf(struct alpn_proto_buf *buf,
1976 const struct alpn_spec *spec)
1977 {
1978 size_t i, len;
1979 int off = 0;
1980 unsigned char blen;
1981
1982 memset(buf, 0, sizeof(*buf));
1983 for(i = 0; spec && i < spec->count; ++i) {
1984 len = strlen(spec->entries[i]);
1985 if(len >= ALPN_NAME_MAX)
1986 return CURLE_FAILED_INIT;
1987 blen = (unsigned char)len;
1988 if(off + blen + 1 >= (int)sizeof(buf->data))
1989 return CURLE_FAILED_INIT;
1990 buf->data[off++] = blen;
1991 memcpy(buf->data + off, spec->entries[i], blen);
1992 off += blen;
1993 }
1994 buf->len = off;
1995 return CURLE_OK;
1996 }
1997
Curl_alpn_to_proto_str(struct alpn_proto_buf * buf,const struct alpn_spec * spec)1998 CURLcode Curl_alpn_to_proto_str(struct alpn_proto_buf *buf,
1999 const struct alpn_spec *spec)
2000 {
2001 size_t i, len;
2002 size_t off = 0;
2003
2004 memset(buf, 0, sizeof(*buf));
2005 for(i = 0; spec && i < spec->count; ++i) {
2006 len = strlen(spec->entries[i]);
2007 if(len >= ALPN_NAME_MAX)
2008 return CURLE_FAILED_INIT;
2009 if(off + len + 2 >= (int)sizeof(buf->data))
2010 return CURLE_FAILED_INIT;
2011 if(off)
2012 buf->data[off++] = ',';
2013 memcpy(buf->data + off, spec->entries[i], len);
2014 off += len;
2015 }
2016 buf->data[off] = '\0';
2017 buf->len = (int)off;
2018 return CURLE_OK;
2019 }
2020
Curl_alpn_set_negotiated(struct Curl_cfilter * cf,struct Curl_easy * data,const unsigned char * proto,size_t proto_len)2021 CURLcode Curl_alpn_set_negotiated(struct Curl_cfilter *cf,
2022 struct Curl_easy *data,
2023 const unsigned char *proto,
2024 size_t proto_len)
2025 {
2026 int can_multi = 0;
2027
2028 if(proto && proto_len) {
2029 if(proto_len == ALPN_HTTP_1_1_LENGTH &&
2030 !memcmp(ALPN_HTTP_1_1, proto, ALPN_HTTP_1_1_LENGTH)) {
2031 cf->conn->alpn = CURL_HTTP_VERSION_1_1;
2032 }
2033 else if(proto_len == ALPN_HTTP_1_0_LENGTH &&
2034 !memcmp(ALPN_HTTP_1_0, proto, ALPN_HTTP_1_0_LENGTH)) {
2035 cf->conn->alpn = CURL_HTTP_VERSION_1_0;
2036 }
2037 #ifdef USE_HTTP2
2038 else if(proto_len == ALPN_H2_LENGTH &&
2039 !memcmp(ALPN_H2, proto, ALPN_H2_LENGTH)) {
2040 cf->conn->alpn = CURL_HTTP_VERSION_2;
2041 can_multi = 1;
2042 }
2043 #endif
2044 #ifdef USE_HTTP3
2045 else if(proto_len == ALPN_H3_LENGTH &&
2046 !memcmp(ALPN_H3, proto, ALPN_H3_LENGTH)) {
2047 cf->conn->alpn = CURL_HTTP_VERSION_3;
2048 can_multi = 1;
2049 }
2050 #endif
2051 else {
2052 cf->conn->alpn = CURL_HTTP_VERSION_NONE;
2053 failf(data, "unsupported ALPN protocol: '%.*s'", (int)proto_len, proto);
2054 /* TODO: do we want to fail this? Previous code just ignored it and
2055 * some vtls backends even ignore the return code of this function. */
2056 /* return CURLE_NOT_BUILT_IN; */
2057 goto out;
2058 }
2059 infof(data, VTLS_INFOF_ALPN_ACCEPTED_LEN_1STR, (int)proto_len, proto);
2060 }
2061 else {
2062 cf->conn->alpn = CURL_HTTP_VERSION_NONE;
2063 infof(data, VTLS_INFOF_NO_ALPN);
2064 }
2065
2066 out:
2067 Curl_multiuse_state(data, can_multi? BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
2068 return CURLE_OK;
2069 }
2070
2071 #endif /* USE_SSL */
2072