1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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 Curl_ossl_ - prefix for OpenSSL ones
32 Curl_gtls_ - prefix for GnuTLS ones
33 Curl_nss_ - prefix for NSS ones
34 Curl_gskit_ - prefix for GSKit ones
35 Curl_polarssl_ - prefix for PolarSSL ones
36 Curl_cyassl_ - prefix for CyaSSL ones
37 Curl_schannel_ - prefix for Schannel SSPI ones
38 Curl_darwinssl_ - prefix for SecureTransport (Darwin) ones
39
40 Note that this source code uses curlssl_* functions, and they are all
41 defines/macros #defined by the lib-specific header files.
42
43 "SSL/TLS Strong Encryption: An Introduction"
44 https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html
45 */
46
47 #include "curl_setup.h"
48
49 #ifdef HAVE_SYS_TYPES_H
50 #include <sys/types.h>
51 #endif
52 #ifdef HAVE_SYS_STAT_H
53 #include <sys/stat.h>
54 #endif
55 #ifdef HAVE_FCNTL_H
56 #include <fcntl.h>
57 #endif
58
59 #include "urldata.h"
60
61 #include "vtls.h" /* generic SSL protos etc */
62 #include "slist.h"
63 #include "sendf.h"
64 #include "strcase.h"
65 #include "url.h"
66 #include "progress.h"
67 #include "share.h"
68 #include "multiif.h"
69 #include "timeval.h"
70 #include "curl_md5.h"
71 #include "warnless.h"
72 #include "curl_base64.h"
73 #include "curl_printf.h"
74
75 /* The last #include files should be: */
76 #include "curl_memory.h"
77 #include "memdebug.h"
78
79 /* convenience macro to check if this handle is using a shared SSL session */
80 #define SSLSESSION_SHARED(data) (data->share && \
81 (data->share->specifier & \
82 (1<<CURL_LOCK_DATA_SSL_SESSION)))
83
84 #define CLONE_STRING(var) \
85 if(source->var) { \
86 dest->var = strdup(source->var); \
87 if(!dest->var) \
88 return FALSE; \
89 } \
90 else \
91 dest->var = NULL;
92
93 bool
Curl_ssl_config_matches(struct ssl_primary_config * data,struct ssl_primary_config * needle)94 Curl_ssl_config_matches(struct ssl_primary_config* data,
95 struct ssl_primary_config* needle)
96 {
97 if((data->version == needle->version) &&
98 (data->verifypeer == needle->verifypeer) &&
99 (data->verifyhost == needle->verifyhost) &&
100 Curl_safe_strcasecompare(data->CApath, needle->CApath) &&
101 Curl_safe_strcasecompare(data->CAfile, needle->CAfile) &&
102 Curl_safe_strcasecompare(data->clientcert, needle->clientcert) &&
103 Curl_safe_strcasecompare(data->cipher_list, needle->cipher_list))
104 return TRUE;
105
106 return FALSE;
107 }
108
109 bool
Curl_clone_primary_ssl_config(struct ssl_primary_config * source,struct ssl_primary_config * dest)110 Curl_clone_primary_ssl_config(struct ssl_primary_config *source,
111 struct ssl_primary_config *dest)
112 {
113 dest->verifyhost = source->verifyhost;
114 dest->verifypeer = source->verifypeer;
115 dest->version = source->version;
116
117 CLONE_STRING(CAfile);
118 CLONE_STRING(CApath);
119 CLONE_STRING(cipher_list);
120 CLONE_STRING(egdsocket);
121 CLONE_STRING(random_file);
122 CLONE_STRING(clientcert);
123 return TRUE;
124 }
125
Curl_free_primary_ssl_config(struct ssl_primary_config * sslc)126 void Curl_free_primary_ssl_config(struct ssl_primary_config* sslc)
127 {
128 Curl_safefree(sslc->CAfile);
129 Curl_safefree(sslc->CApath);
130 Curl_safefree(sslc->cipher_list);
131 Curl_safefree(sslc->egdsocket);
132 Curl_safefree(sslc->random_file);
133 Curl_safefree(sslc->clientcert);
134 }
135
Curl_ssl_backend(void)136 int Curl_ssl_backend(void)
137 {
138 return (int)CURL_SSL_BACKEND;
139 }
140
141 #ifdef USE_SSL
142
143 /* "global" init done? */
144 static bool init_ssl=FALSE;
145
146 /**
147 * Global SSL init
148 *
149 * @retval 0 error initializing SSL
150 * @retval 1 SSL initialized successfully
151 */
Curl_ssl_init(void)152 int Curl_ssl_init(void)
153 {
154 /* make sure this is only done once */
155 if(init_ssl)
156 return 1;
157 init_ssl = TRUE; /* never again */
158
159 return curlssl_init();
160 }
161
162
163 /* Global cleanup */
Curl_ssl_cleanup(void)164 void Curl_ssl_cleanup(void)
165 {
166 if(init_ssl) {
167 /* only cleanup if we did a previous init */
168 curlssl_cleanup();
169 init_ssl = FALSE;
170 }
171 }
172
ssl_prefs_check(struct Curl_easy * data)173 static bool ssl_prefs_check(struct Curl_easy *data)
174 {
175 /* check for CURLOPT_SSLVERSION invalid parameter value */
176 if((data->set.ssl.primary.version < 0)
177 || (data->set.ssl.primary.version >= CURL_SSLVERSION_LAST)) {
178 failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION");
179 return FALSE;
180 }
181 return TRUE;
182 }
183
184 static CURLcode
ssl_connect_init_proxy(struct connectdata * conn,int sockindex)185 ssl_connect_init_proxy(struct connectdata *conn, int sockindex)
186 {
187 DEBUGASSERT(conn->bits.proxy_ssl_connected[sockindex]);
188 if(ssl_connection_complete == conn->ssl[sockindex].state &&
189 !conn->proxy_ssl[sockindex].use) {
190 #if defined(HTTPS_PROXY_SUPPORT)
191 conn->proxy_ssl[sockindex] = conn->ssl[sockindex];
192 memset(&conn->ssl[sockindex], 0, sizeof(conn->ssl[sockindex]));
193 #else
194 return CURLE_NOT_BUILT_IN;
195 #endif
196 }
197 return CURLE_OK;
198 }
199
200 CURLcode
Curl_ssl_connect(struct connectdata * conn,int sockindex)201 Curl_ssl_connect(struct connectdata *conn, int sockindex)
202 {
203 CURLcode result;
204
205 if(conn->bits.proxy_ssl_connected[sockindex]) {
206 result = ssl_connect_init_proxy(conn, sockindex);
207 if(result)
208 return result;
209 }
210
211 if(!ssl_prefs_check(conn->data))
212 return CURLE_SSL_CONNECT_ERROR;
213
214 /* mark this is being ssl-enabled from here on. */
215 conn->ssl[sockindex].use = TRUE;
216 conn->ssl[sockindex].state = ssl_connection_negotiating;
217
218 result = curlssl_connect(conn, sockindex);
219
220 if(!result)
221 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
222
223 return result;
224 }
225
226 CURLcode
Curl_ssl_connect_nonblocking(struct connectdata * conn,int sockindex,bool * done)227 Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex,
228 bool *done)
229 {
230 CURLcode result;
231 if(conn->bits.proxy_ssl_connected[sockindex]) {
232 result = ssl_connect_init_proxy(conn, sockindex);
233 if(result)
234 return result;
235 }
236
237 if(!ssl_prefs_check(conn->data))
238 return CURLE_SSL_CONNECT_ERROR;
239
240 /* mark this is being ssl requested from here on. */
241 conn->ssl[sockindex].use = TRUE;
242 #ifdef curlssl_connect_nonblocking
243 result = curlssl_connect_nonblocking(conn, sockindex, done);
244 #else
245 *done = TRUE; /* fallback to BLOCKING */
246 result = curlssl_connect(conn, sockindex);
247 #endif /* non-blocking connect support */
248 if(!result && *done)
249 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
250 return result;
251 }
252
253 /*
254 * Lock shared SSL session data
255 */
Curl_ssl_sessionid_lock(struct connectdata * conn)256 void Curl_ssl_sessionid_lock(struct connectdata *conn)
257 {
258 if(SSLSESSION_SHARED(conn->data))
259 Curl_share_lock(conn->data,
260 CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
261 }
262
263 /*
264 * Unlock shared SSL session data
265 */
Curl_ssl_sessionid_unlock(struct connectdata * conn)266 void Curl_ssl_sessionid_unlock(struct connectdata *conn)
267 {
268 if(SSLSESSION_SHARED(conn->data))
269 Curl_share_unlock(conn->data, CURL_LOCK_DATA_SSL_SESSION);
270 }
271
272 /*
273 * Check if there's a session ID for the given connection in the cache, and if
274 * there's one suitable, it is provided. Returns TRUE when no entry matched.
275 */
Curl_ssl_getsessionid(struct connectdata * conn,void ** ssl_sessionid,size_t * idsize,int sockindex)276 bool Curl_ssl_getsessionid(struct connectdata *conn,
277 void **ssl_sessionid,
278 size_t *idsize, /* set 0 if unknown */
279 int sockindex)
280 {
281 struct curl_ssl_session *check;
282 struct Curl_easy *data = conn->data;
283 size_t i;
284 long *general_age;
285 bool no_match = TRUE;
286
287 const bool isProxy = CONNECT_PROXY_SSL();
288 struct ssl_primary_config * const ssl_config = isProxy ?
289 &conn->proxy_ssl_config :
290 &conn->ssl_config;
291 const char * const name = isProxy ? conn->http_proxy.host.name :
292 conn->host.name;
293 int port = isProxy ? (int)conn->port : conn->remote_port;
294 *ssl_sessionid = NULL;
295
296 DEBUGASSERT(data->set.general_ssl.sessionid);
297
298 if(!data->set.general_ssl.sessionid)
299 /* session ID re-use is disabled */
300 return TRUE;
301
302 /* Lock if shared */
303 if(SSLSESSION_SHARED(data))
304 general_age = &data->share->sessionage;
305 else
306 general_age = &data->state.sessionage;
307
308 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
309 check = &data->state.session[i];
310 if(!check->sessionid)
311 /* not session ID means blank entry */
312 continue;
313 if(strcasecompare(name, check->name) &&
314 ((!conn->bits.conn_to_host && !check->conn_to_host) ||
315 (conn->bits.conn_to_host && check->conn_to_host &&
316 strcasecompare(conn->conn_to_host.name, check->conn_to_host))) &&
317 ((!conn->bits.conn_to_port && check->conn_to_port == -1) ||
318 (conn->bits.conn_to_port && check->conn_to_port != -1 &&
319 conn->conn_to_port == check->conn_to_port)) &&
320 (port == check->remote_port) &&
321 strcasecompare(conn->handler->scheme, check->scheme) &&
322 Curl_ssl_config_matches(ssl_config, &check->ssl_config)) {
323 /* yes, we have a session ID! */
324 (*general_age)++; /* increase general age */
325 check->age = *general_age; /* set this as used in this age */
326 *ssl_sessionid = check->sessionid;
327 if(idsize)
328 *idsize = check->idsize;
329 no_match = FALSE;
330 break;
331 }
332 }
333
334 return no_match;
335 }
336
337 /*
338 * Kill a single session ID entry in the cache.
339 */
Curl_ssl_kill_session(struct curl_ssl_session * session)340 void Curl_ssl_kill_session(struct curl_ssl_session *session)
341 {
342 if(session->sessionid) {
343 /* defensive check */
344
345 /* free the ID the SSL-layer specific way */
346 curlssl_session_free(session->sessionid);
347
348 session->sessionid = NULL;
349 session->age = 0; /* fresh */
350
351 Curl_free_primary_ssl_config(&session->ssl_config);
352
353 Curl_safefree(session->name);
354 Curl_safefree(session->conn_to_host);
355 }
356 }
357
358 /*
359 * Delete the given session ID from the cache.
360 */
Curl_ssl_delsessionid(struct connectdata * conn,void * ssl_sessionid)361 void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid)
362 {
363 size_t i;
364 struct Curl_easy *data=conn->data;
365
366 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) {
367 struct curl_ssl_session *check = &data->state.session[i];
368
369 if(check->sessionid == ssl_sessionid) {
370 Curl_ssl_kill_session(check);
371 break;
372 }
373 }
374 }
375
376 /*
377 * Store session id in the session cache. The ID passed on to this function
378 * must already have been extracted and allocated the proper way for the SSL
379 * layer. Curl_XXXX_session_free() will be called to free/kill the session ID
380 * later on.
381 */
Curl_ssl_addsessionid(struct connectdata * conn,void * ssl_sessionid,size_t idsize,int sockindex)382 CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
383 void *ssl_sessionid,
384 size_t idsize,
385 int sockindex)
386 {
387 size_t i;
388 struct Curl_easy *data=conn->data; /* the mother of all structs */
389 struct curl_ssl_session *store = &data->state.session[0];
390 long oldest_age=data->state.session[0].age; /* zero if unused */
391 char *clone_host;
392 char *clone_conn_to_host;
393 int conn_to_port;
394 long *general_age;
395 const bool isProxy = CONNECT_PROXY_SSL();
396 struct ssl_primary_config * const ssl_config = isProxy ?
397 &conn->proxy_ssl_config :
398 &conn->ssl_config;
399
400 DEBUGASSERT(data->set.general_ssl.sessionid);
401
402 clone_host = strdup(isProxy ? conn->http_proxy.host.name : conn->host.name);
403 if(!clone_host)
404 return CURLE_OUT_OF_MEMORY; /* bail out */
405
406 if(conn->bits.conn_to_host) {
407 clone_conn_to_host = strdup(conn->conn_to_host.name);
408 if(!clone_conn_to_host) {
409 free(clone_host);
410 return CURLE_OUT_OF_MEMORY; /* bail out */
411 }
412 }
413 else
414 clone_conn_to_host = NULL;
415
416 if(conn->bits.conn_to_port)
417 conn_to_port = conn->conn_to_port;
418 else
419 conn_to_port = -1;
420
421 /* Now we should add the session ID and the host name to the cache, (remove
422 the oldest if necessary) */
423
424 /* If using shared SSL session, lock! */
425 if(SSLSESSION_SHARED(data)) {
426 general_age = &data->share->sessionage;
427 }
428 else {
429 general_age = &data->state.sessionage;
430 }
431
432 /* find an empty slot for us, or find the oldest */
433 for(i = 1; (i < data->set.general_ssl.max_ssl_sessions) &&
434 data->state.session[i].sessionid; i++) {
435 if(data->state.session[i].age < oldest_age) {
436 oldest_age = data->state.session[i].age;
437 store = &data->state.session[i];
438 }
439 }
440 if(i == data->set.general_ssl.max_ssl_sessions)
441 /* cache is full, we must "kill" the oldest entry! */
442 Curl_ssl_kill_session(store);
443 else
444 store = &data->state.session[i]; /* use this slot */
445
446 /* now init the session struct wisely */
447 store->sessionid = ssl_sessionid;
448 store->idsize = idsize;
449 store->age = *general_age; /* set current age */
450 /* free it if there's one already present */
451 free(store->name);
452 free(store->conn_to_host);
453 store->name = clone_host; /* clone host name */
454 store->conn_to_host = clone_conn_to_host; /* clone connect to host name */
455 store->conn_to_port = conn_to_port; /* connect to port number */
456 /* port number */
457 store->remote_port = isProxy ? (int)conn->port : conn->remote_port;
458 store->scheme = conn->handler->scheme;
459
460 if(!Curl_clone_primary_ssl_config(ssl_config, &store->ssl_config)) {
461 store->sessionid = NULL; /* let caller free sessionid */
462 free(clone_host);
463 free(clone_conn_to_host);
464 return CURLE_OUT_OF_MEMORY;
465 }
466
467 return CURLE_OK;
468 }
469
470
Curl_ssl_close_all(struct Curl_easy * data)471 void Curl_ssl_close_all(struct Curl_easy *data)
472 {
473 size_t i;
474 /* kill the session ID cache if not shared */
475 if(data->state.session && !SSLSESSION_SHARED(data)) {
476 for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++)
477 /* the single-killer function handles empty table slots */
478 Curl_ssl_kill_session(&data->state.session[i]);
479
480 /* free the cache data */
481 Curl_safefree(data->state.session);
482 }
483
484 curlssl_close_all(data);
485 }
486
487 #if defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \
488 defined(USE_DARWINSSL) || defined(USE_POLARSSL) || defined(USE_NSS) || \
489 defined(USE_MBEDTLS)
Curl_ssl_getsock(struct connectdata * conn,curl_socket_t * socks,int numsocks)490 int Curl_ssl_getsock(struct connectdata *conn, curl_socket_t *socks,
491 int numsocks)
492 {
493 struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
494
495 if(!numsocks)
496 return GETSOCK_BLANK;
497
498 if(connssl->connecting_state == ssl_connect_2_writing) {
499 /* write mode */
500 socks[0] = conn->sock[FIRSTSOCKET];
501 return GETSOCK_WRITESOCK(0);
502 }
503 else if(connssl->connecting_state == ssl_connect_2_reading) {
504 /* read mode */
505 socks[0] = conn->sock[FIRSTSOCKET];
506 return GETSOCK_READSOCK(0);
507 }
508
509 return GETSOCK_BLANK;
510 }
511 #else
Curl_ssl_getsock(struct connectdata * conn,curl_socket_t * socks,int numsocks)512 int Curl_ssl_getsock(struct connectdata *conn,
513 curl_socket_t *socks,
514 int numsocks)
515 {
516 (void)conn;
517 (void)socks;
518 (void)numsocks;
519 return GETSOCK_BLANK;
520 }
521 /* USE_OPENSSL || USE_GNUTLS || USE_SCHANNEL || USE_DARWINSSL || USE_NSS */
522 #endif
523
Curl_ssl_close(struct connectdata * conn,int sockindex)524 void Curl_ssl_close(struct connectdata *conn, int sockindex)
525 {
526 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
527 curlssl_close(conn, sockindex);
528 }
529
Curl_ssl_shutdown(struct connectdata * conn,int sockindex)530 CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex)
531 {
532 if(curlssl_shutdown(conn, sockindex))
533 return CURLE_SSL_SHUTDOWN_FAILED;
534
535 conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */
536 conn->ssl[sockindex].state = ssl_connection_none;
537
538 conn->recv[sockindex] = Curl_recv_plain;
539 conn->send[sockindex] = Curl_send_plain;
540
541 return CURLE_OK;
542 }
543
544 /* Selects an SSL crypto engine
545 */
Curl_ssl_set_engine(struct Curl_easy * data,const char * engine)546 CURLcode Curl_ssl_set_engine(struct Curl_easy *data, const char *engine)
547 {
548 return curlssl_set_engine(data, engine);
549 }
550
551 /* Selects the default SSL crypto engine
552 */
Curl_ssl_set_engine_default(struct Curl_easy * data)553 CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data)
554 {
555 return curlssl_set_engine_default(data);
556 }
557
558 /* Return list of OpenSSL crypto engine names. */
Curl_ssl_engines_list(struct Curl_easy * data)559 struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data)
560 {
561 return curlssl_engines_list(data);
562 }
563
564 /*
565 * This sets up a session ID cache to the specified size. Make sure this code
566 * is agnostic to what underlying SSL technology we use.
567 */
Curl_ssl_initsessions(struct Curl_easy * data,size_t amount)568 CURLcode Curl_ssl_initsessions(struct Curl_easy *data, size_t amount)
569 {
570 struct curl_ssl_session *session;
571
572 if(data->state.session)
573 /* this is just a precaution to prevent multiple inits */
574 return CURLE_OK;
575
576 session = calloc(amount, sizeof(struct curl_ssl_session));
577 if(!session)
578 return CURLE_OUT_OF_MEMORY;
579
580 /* store the info in the SSL section */
581 data->set.general_ssl.max_ssl_sessions = amount;
582 data->state.session = session;
583 data->state.sessionage = 1; /* this is brand new */
584 return CURLE_OK;
585 }
586
Curl_ssl_version(char * buffer,size_t size)587 size_t Curl_ssl_version(char *buffer, size_t size)
588 {
589 return curlssl_version(buffer, size);
590 }
591
592 /*
593 * This function tries to determine connection status.
594 *
595 * Return codes:
596 * 1 means the connection is still in place
597 * 0 means the connection has been closed
598 * -1 means the connection status is unknown
599 */
Curl_ssl_check_cxn(struct connectdata * conn)600 int Curl_ssl_check_cxn(struct connectdata *conn)
601 {
602 return curlssl_check_cxn(conn);
603 }
604
Curl_ssl_data_pending(const struct connectdata * conn,int connindex)605 bool Curl_ssl_data_pending(const struct connectdata *conn,
606 int connindex)
607 {
608 return curlssl_data_pending(conn, connindex);
609 }
610
Curl_ssl_free_certinfo(struct Curl_easy * data)611 void Curl_ssl_free_certinfo(struct Curl_easy *data)
612 {
613 int i;
614 struct curl_certinfo *ci = &data->info.certs;
615
616 if(ci->num_of_certs) {
617 /* free all individual lists used */
618 for(i=0; i<ci->num_of_certs; i++) {
619 curl_slist_free_all(ci->certinfo[i]);
620 ci->certinfo[i] = NULL;
621 }
622
623 free(ci->certinfo); /* free the actual array too */
624 ci->certinfo = NULL;
625 ci->num_of_certs = 0;
626 }
627 }
628
Curl_ssl_init_certinfo(struct Curl_easy * data,int num)629 CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num)
630 {
631 struct curl_certinfo *ci = &data->info.certs;
632 struct curl_slist **table;
633
634 /* Free any previous certificate information structures */
635 Curl_ssl_free_certinfo(data);
636
637 /* Allocate the required certificate information structures */
638 table = calloc((size_t) num, sizeof(struct curl_slist *));
639 if(!table)
640 return CURLE_OUT_OF_MEMORY;
641
642 ci->num_of_certs = num;
643 ci->certinfo = table;
644
645 return CURLE_OK;
646 }
647
648 /*
649 * 'value' is NOT a zero terminated string
650 */
Curl_ssl_push_certinfo_len(struct Curl_easy * data,int certnum,const char * label,const char * value,size_t valuelen)651 CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data,
652 int certnum,
653 const char *label,
654 const char *value,
655 size_t valuelen)
656 {
657 struct curl_certinfo *ci = &data->info.certs;
658 char *output;
659 struct curl_slist *nl;
660 CURLcode result = CURLE_OK;
661 size_t labellen = strlen(label);
662 size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */
663
664 output = malloc(outlen);
665 if(!output)
666 return CURLE_OUT_OF_MEMORY;
667
668 /* sprintf the label and colon */
669 snprintf(output, outlen, "%s:", label);
670
671 /* memcpy the value (it might not be zero terminated) */
672 memcpy(&output[labellen+1], value, valuelen);
673
674 /* zero terminate the output */
675 output[labellen + 1 + valuelen] = 0;
676
677 nl = Curl_slist_append_nodup(ci->certinfo[certnum], output);
678 if(!nl) {
679 free(output);
680 curl_slist_free_all(ci->certinfo[certnum]);
681 result = CURLE_OUT_OF_MEMORY;
682 }
683
684 ci->certinfo[certnum] = nl;
685 return result;
686 }
687
688 /*
689 * This is a convenience function for push_certinfo_len that takes a zero
690 * terminated value.
691 */
Curl_ssl_push_certinfo(struct Curl_easy * data,int certnum,const char * label,const char * value)692 CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data,
693 int certnum,
694 const char *label,
695 const char *value)
696 {
697 size_t valuelen = strlen(value);
698
699 return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen);
700 }
701
Curl_ssl_random(struct Curl_easy * data,unsigned char * entropy,size_t length)702 CURLcode Curl_ssl_random(struct Curl_easy *data,
703 unsigned char *entropy,
704 size_t length)
705 {
706 return curlssl_random(data, entropy, length);
707 }
708
709 /*
710 * Public key pem to der conversion
711 */
712
pubkey_pem_to_der(const char * pem,unsigned char ** der,size_t * der_len)713 static CURLcode pubkey_pem_to_der(const char *pem,
714 unsigned char **der, size_t *der_len)
715 {
716 char *stripped_pem, *begin_pos, *end_pos;
717 size_t pem_count, stripped_pem_count = 0, pem_len;
718 CURLcode result;
719
720 /* if no pem, exit. */
721 if(!pem)
722 return CURLE_BAD_CONTENT_ENCODING;
723
724 begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----");
725 if(!begin_pos)
726 return CURLE_BAD_CONTENT_ENCODING;
727
728 pem_count = begin_pos - pem;
729 /* Invalid if not at beginning AND not directly following \n */
730 if(0 != pem_count && '\n' != pem[pem_count - 1])
731 return CURLE_BAD_CONTENT_ENCODING;
732
733 /* 26 is length of "-----BEGIN PUBLIC KEY-----" */
734 pem_count += 26;
735
736 /* Invalid if not directly following \n */
737 end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----");
738 if(!end_pos)
739 return CURLE_BAD_CONTENT_ENCODING;
740
741 pem_len = end_pos - pem;
742
743 stripped_pem = malloc(pem_len - pem_count + 1);
744 if(!stripped_pem)
745 return CURLE_OUT_OF_MEMORY;
746
747 /*
748 * Here we loop through the pem array one character at a time between the
749 * correct indices, and place each character that is not '\n' or '\r'
750 * into the stripped_pem array, which should represent the raw base64 string
751 */
752 while(pem_count < pem_len) {
753 if('\n' != pem[pem_count] && '\r' != pem[pem_count])
754 stripped_pem[stripped_pem_count++] = pem[pem_count];
755 ++pem_count;
756 }
757 /* Place the null terminator in the correct place */
758 stripped_pem[stripped_pem_count] = '\0';
759
760 result = Curl_base64_decode(stripped_pem, der, der_len);
761
762 Curl_safefree(stripped_pem);
763
764 return result;
765 }
766
767 /*
768 * Generic pinned public key check.
769 */
770
Curl_pin_peer_pubkey(struct Curl_easy * data,const char * pinnedpubkey,const unsigned char * pubkey,size_t pubkeylen)771 CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
772 const char *pinnedpubkey,
773 const unsigned char *pubkey, size_t pubkeylen)
774 {
775 FILE *fp;
776 unsigned char *buf = NULL, *pem_ptr = NULL;
777 long filesize;
778 size_t size, pem_len;
779 CURLcode pem_read;
780 CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
781 #ifdef curlssl_sha256sum
782 CURLcode encode;
783 size_t encodedlen, pinkeylen;
784 char *encoded, *pinkeycopy, *begin_pos, *end_pos;
785 unsigned char *sha256sumdigest = NULL;
786 #endif
787
788 /* if a path wasn't specified, don't pin */
789 if(!pinnedpubkey)
790 return CURLE_OK;
791 if(!pubkey || !pubkeylen)
792 return result;
793
794 /* only do this if pinnedpubkey starts with "sha256//", length 8 */
795 if(strncmp(pinnedpubkey, "sha256//", 8) == 0) {
796 #ifdef curlssl_sha256sum
797 /* compute sha256sum of public key */
798 sha256sumdigest = malloc(SHA256_DIGEST_LENGTH);
799 if(!sha256sumdigest)
800 return CURLE_OUT_OF_MEMORY;
801 curlssl_sha256sum(pubkey, pubkeylen,
802 sha256sumdigest, SHA256_DIGEST_LENGTH);
803 encode = Curl_base64_encode(data, (char *)sha256sumdigest,
804 SHA256_DIGEST_LENGTH, &encoded, &encodedlen);
805 Curl_safefree(sha256sumdigest);
806
807 if(encode)
808 return encode;
809
810 infof(data, "\t public key hash: sha256//%s\n", encoded);
811
812 /* it starts with sha256//, copy so we can modify it */
813 pinkeylen = strlen(pinnedpubkey) + 1;
814 pinkeycopy = malloc(pinkeylen);
815 if(!pinkeycopy) {
816 Curl_safefree(encoded);
817 return CURLE_OUT_OF_MEMORY;
818 }
819 memcpy(pinkeycopy, pinnedpubkey, pinkeylen);
820 /* point begin_pos to the copy, and start extracting keys */
821 begin_pos = pinkeycopy;
822 do {
823 end_pos = strstr(begin_pos, ";sha256//");
824 /*
825 * if there is an end_pos, null terminate,
826 * otherwise it'll go to the end of the original string
827 */
828 if(end_pos)
829 end_pos[0] = '\0';
830
831 /* compare base64 sha256 digests, 8 is the length of "sha256//" */
832 if(encodedlen == strlen(begin_pos + 8) &&
833 !memcmp(encoded, begin_pos + 8, encodedlen)) {
834 result = CURLE_OK;
835 break;
836 }
837
838 /*
839 * change back the null-terminator we changed earlier,
840 * and look for next begin
841 */
842 if(end_pos) {
843 end_pos[0] = ';';
844 begin_pos = strstr(end_pos, "sha256//");
845 }
846 } while(end_pos && begin_pos);
847 Curl_safefree(encoded);
848 Curl_safefree(pinkeycopy);
849 #else
850 /* without sha256 support, this cannot match */
851 (void)data;
852 #endif
853 return result;
854 }
855
856 fp = fopen(pinnedpubkey, "rb");
857 if(!fp)
858 return result;
859
860 do {
861 /* Determine the file's size */
862 if(fseek(fp, 0, SEEK_END))
863 break;
864 filesize = ftell(fp);
865 if(fseek(fp, 0, SEEK_SET))
866 break;
867 if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE)
868 break;
869
870 /*
871 * if the size of our certificate is bigger than the file
872 * size then it can't match
873 */
874 size = curlx_sotouz((curl_off_t) filesize);
875 if(pubkeylen > size)
876 break;
877
878 /*
879 * Allocate buffer for the pinned key
880 * With 1 additional byte for null terminator in case of PEM key
881 */
882 buf = malloc(size + 1);
883 if(!buf)
884 break;
885
886 /* Returns number of elements read, which should be 1 */
887 if((int) fread(buf, size, 1, fp) != 1)
888 break;
889
890 /* If the sizes are the same, it can't be base64 encoded, must be der */
891 if(pubkeylen == size) {
892 if(!memcmp(pubkey, buf, pubkeylen))
893 result = CURLE_OK;
894 break;
895 }
896
897 /*
898 * Otherwise we will assume it's PEM and try to decode it
899 * after placing null terminator
900 */
901 buf[size] = '\0';
902 pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len);
903 /* if it wasn't read successfully, exit */
904 if(pem_read)
905 break;
906
907 /*
908 * if the size of our certificate doesn't match the size of
909 * the decoded file, they can't be the same, otherwise compare
910 */
911 if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen))
912 result = CURLE_OK;
913 } while(0);
914
915 Curl_safefree(buf);
916 Curl_safefree(pem_ptr);
917 fclose(fp);
918
919 return result;
920 }
921
922 #ifndef CURL_DISABLE_CRYPTO_AUTH
Curl_ssl_md5sum(unsigned char * tmp,size_t tmplen,unsigned char * md5sum,size_t md5len)923 CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */
924 size_t tmplen,
925 unsigned char *md5sum, /* output */
926 size_t md5len)
927 {
928 #ifdef curlssl_md5sum
929 curlssl_md5sum(tmp, tmplen, md5sum, md5len);
930 #else
931 MD5_context *MD5pw;
932
933 (void) md5len;
934
935 MD5pw = Curl_MD5_init(Curl_DIGEST_MD5);
936 if(!MD5pw)
937 return CURLE_OUT_OF_MEMORY;
938 Curl_MD5_update(MD5pw, tmp, curlx_uztoui(tmplen));
939 Curl_MD5_final(MD5pw, md5sum);
940 #endif
941 return CURLE_OK;
942 }
943 #endif
944
945 /*
946 * Check whether the SSL backend supports the status_request extension.
947 */
Curl_ssl_cert_status_request(void)948 bool Curl_ssl_cert_status_request(void)
949 {
950 #ifdef curlssl_cert_status_request
951 return curlssl_cert_status_request();
952 #else
953 return FALSE;
954 #endif
955 }
956
957 /*
958 * Check whether the SSL backend supports false start.
959 */
Curl_ssl_false_start(void)960 bool Curl_ssl_false_start(void)
961 {
962 #ifdef curlssl_false_start
963 return curlssl_false_start();
964 #else
965 return FALSE;
966 #endif
967 }
968
969 #endif /* USE_SSL */
970