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

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
9 * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
10 *
11 * This software is licensed as described in the file COPYING, which
12 * you should have received as part of this distribution. The terms
13 * are also available at https://curl.haxx.se/docs/copyright.html.
14 *
15 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
16 * copies of the Software, and permit persons to whom the Software is
17 * furnished to do so, under the terms of the COPYING file.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ***************************************************************************/
23
24 /*
25 * Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
26 * but vtls.c should ever call or use these functions.
27 *
28 */
29
30 #include "curl_setup.h"
31
32 #ifdef USE_MBEDTLS
33
34 #include <mbedtls/version.h>
35 #if MBEDTLS_VERSION_NUMBER >= 0x02040000
36 #include <mbedtls/net_sockets.h>
37 #else
38 #include <mbedtls/net.h>
39 #endif
40 #include <mbedtls/ssl.h>
41 #include <mbedtls/certs.h>
42 #include <mbedtls/x509.h>
43
44 #include <mbedtls/error.h>
45 #include <mbedtls/entropy.h>
46 #include <mbedtls/ctr_drbg.h>
47 #include <mbedtls/sha256.h>
48
49 #include "urldata.h"
50 #include "sendf.h"
51 #include "inet_pton.h"
52 #include "mbedtls.h"
53 #include "vtls.h"
54 #include "parsedate.h"
55 #include "connect.h" /* for the connect timeout */
56 #include "select.h"
57 #include "multiif.h"
58 #include "polarssl_threadlock.h"
59
60 /* The last 3 #include files should be in this order */
61 #include "curl_printf.h"
62 #include "curl_memory.h"
63 #include "memdebug.h"
64
65 struct ssl_backend_data {
66 mbedtls_ctr_drbg_context ctr_drbg;
67 mbedtls_entropy_context entropy;
68 mbedtls_ssl_context ssl;
69 int server_fd;
70 mbedtls_x509_crt cacert;
71 mbedtls_x509_crt clicert;
72 mbedtls_x509_crl crl;
73 mbedtls_pk_context pk;
74 mbedtls_ssl_config config;
75 const char *protocols[3];
76 };
77
78 #define BACKEND connssl->backend
79
80 /* apply threading? */
81 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
82 #define THREADING_SUPPORT
83 #endif
84
85 #if defined(THREADING_SUPPORT)
86 static mbedtls_entropy_context ts_entropy;
87
88 static int entropy_init_initialized = 0;
89
90 /* start of entropy_init_mutex() */
91 static void entropy_init_mutex(mbedtls_entropy_context *ctx)
92 {
93 /* lock 0 = entropy_init_mutex() */
94 Curl_polarsslthreadlock_lock_function(0);
95 if(entropy_init_initialized == 0) {
96 mbedtls_entropy_init(ctx);
97 entropy_init_initialized = 1;
98 }
99 Curl_polarsslthreadlock_unlock_function(0);
100 }
101 /* end of entropy_init_mutex() */
102
103 /* start of entropy_func_mutex() */
104 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
105 {
106 int ret;
107 /* lock 1 = entropy_func_mutex() */
108 Curl_polarsslthreadlock_lock_function(1);
109 ret = mbedtls_entropy_func(data, output, len);
110 Curl_polarsslthreadlock_unlock_function(1);
111
112 return ret;
113 }
114 /* end of entropy_func_mutex() */
115
116 #endif /* THREADING_SUPPORT */
117
118 /* Define this to enable lots of debugging for mbedTLS */
119 #undef MBEDTLS_DEBUG
120
121 #ifdef MBEDTLS_DEBUG
122 static void mbed_debug(void *context, int level, const char *f_name,
123 int line_nb, const char *line)
124 {
125 struct Curl_easy *data = NULL;
126
127 if(!context)
128 return;
129
130 data = (struct Curl_easy *)context;
131
132 infof(data, "%s", line);
133 (void) level;
134 }
135 #else
136 #endif
137
138 /* ALPN for http2? */
139 #ifdef USE_NGHTTP2
140 # undef HAS_ALPN
141 # ifdef MBEDTLS_SSL_ALPN
142 # define HAS_ALPN
143 # endif
144 #endif
145
146
147 /*
148 * profile
149 */
150 static const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_fr =
151 {
152 /* Hashes from SHA-1 and above */
153 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA1) |
154 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_RIPEMD160) |
155 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA224) |
156 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA256) |
157 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA384) |
158 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA512),
159 0xFFFFFFF, /* Any PK alg */
160 0xFFFFFFF, /* Any curve */
161 1024, /* RSA min key len */
162 };
163
164 /* See https://tls.mbed.org/discussions/generic/
165 howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
166 */
167 #define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
168 #define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
169
170 #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
171 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
172
173 static Curl_recv mbed_recv;
174 static Curl_send mbed_send;
175
176 static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
177 {
178 switch(version) {
179 case CURL_SSLVERSION_TLSv1_0:
180 *mbedver = MBEDTLS_SSL_MINOR_VERSION_1;
181 return CURLE_OK;
182 case CURL_SSLVERSION_TLSv1_1:
183 *mbedver = MBEDTLS_SSL_MINOR_VERSION_2;
184 return CURLE_OK;
185 case CURL_SSLVERSION_TLSv1_2:
186 *mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
187 return CURLE_OK;
188 case CURL_SSLVERSION_TLSv1_3:
189 break;
190 }
191 return CURLE_SSL_CONNECT_ERROR;
192 }
193
194 static CURLcode
195 set_ssl_version_min_max(struct connectdata *conn, int sockindex)
196 {
197 struct Curl_easy *data = conn->data;
198 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
199 int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_1;
200 int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_1;
201 long ssl_version = SSL_CONN_CONFIG(version);
202 long ssl_version_max = SSL_CONN_CONFIG(version_max);
203 CURLcode result = CURLE_OK;
204
205 switch(ssl_version) {
206 case CURL_SSLVERSION_DEFAULT:
207 case CURL_SSLVERSION_TLSv1:
208 ssl_version = CURL_SSLVERSION_TLSv1_0;
209 break;
210 }
211
212 switch(ssl_version_max) {
213 case CURL_SSLVERSION_MAX_NONE:
214 case CURL_SSLVERSION_MAX_DEFAULT:
215 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
216 break;
217 }
218
219 result = mbedtls_version_from_curl(&mbedtls_ver_min, ssl_version);
220 if(result) {
221 failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
222 return result;
223 }
224 result = mbedtls_version_from_curl(&mbedtls_ver_max, ssl_version_max >> 16);
225 if(result) {
226 failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
227 return result;
228 }
229
230 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
231 mbedtls_ver_min);
232 mbedtls_ssl_conf_max_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
233 mbedtls_ver_max);
234
235 return result;
236 }
237
238 static CURLcode
239 mbed_connect_step1(struct connectdata *conn,
240 int sockindex)
241 {
242 struct Curl_easy *data = conn->data;
243 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
244 const char * const ssl_cafile = SSL_CONN_CONFIG(CAfile);
245 const bool verifypeer = SSL_CONN_CONFIG(verifypeer);
246 const char * const ssl_capath = SSL_CONN_CONFIG(CApath);
247 char * const ssl_cert = SSL_SET_OPTION(cert);
248 const char * const ssl_crlfile = SSL_SET_OPTION(CRLfile);
249 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
250 conn->host.name;
251 const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
252 int ret = -1;
253 char errorbuf[128];
254 errorbuf[0] = 0;
255
256 /* mbedTLS only supports SSLv3 and TLSv1 */
257 if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
258 failf(data, "mbedTLS does not support SSLv2");
259 return CURLE_SSL_CONNECT_ERROR;
260 }
261
262 #ifdef THREADING_SUPPORT
263 entropy_init_mutex(&ts_entropy);
264 mbedtls_ctr_drbg_init(&BACKEND->ctr_drbg);
265
266 ret = mbedtls_ctr_drbg_seed(&BACKEND->ctr_drbg, entropy_func_mutex,
267 &ts_entropy, NULL, 0);
268 if(ret) {
269 #ifdef MBEDTLS_ERROR_C
270 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
271 #endif /* MBEDTLS_ERROR_C */
272 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
273 -ret, errorbuf);
274 }
275 #else
276 mbedtls_entropy_init(&BACKEND->entropy);
277 mbedtls_ctr_drbg_init(&BACKEND->ctr_drbg);
278
279 ret = mbedtls_ctr_drbg_seed(&BACKEND->ctr_drbg, mbedtls_entropy_func,
280 &BACKEND->entropy, NULL, 0);
281 if(ret) {
282 #ifdef MBEDTLS_ERROR_C
283 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
284 #endif /* MBEDTLS_ERROR_C */
285 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
286 -ret, errorbuf);
287 }
288 #endif /* THREADING_SUPPORT */
289
290 /* Load the trusted CA */
291 mbedtls_x509_crt_init(&BACKEND->cacert);
292
293 if(ssl_cafile) {
294 ret = mbedtls_x509_crt_parse_file(&BACKEND->cacert, ssl_cafile);
295
296 if(ret<0) {
297 #ifdef MBEDTLS_ERROR_C
298 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
299 #endif /* MBEDTLS_ERROR_C */
300 failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
301 ssl_cafile, -ret, errorbuf);
302
303 if(verifypeer)
304 return CURLE_SSL_CACERT_BADFILE;
305 }
306 }
307
308 if(ssl_capath) {
309 ret = mbedtls_x509_crt_parse_path(&BACKEND->cacert, ssl_capath);
310
311 if(ret<0) {
312 #ifdef MBEDTLS_ERROR_C
313 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
314 #endif /* MBEDTLS_ERROR_C */
315 failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
316 ssl_capath, -ret, errorbuf);
317
318 if(verifypeer)
319 return CURLE_SSL_CACERT_BADFILE;
320 }
321 }
322
323 /* Load the client certificate */
324 mbedtls_x509_crt_init(&BACKEND->clicert);
325
326 if(ssl_cert) {
327 ret = mbedtls_x509_crt_parse_file(&BACKEND->clicert, ssl_cert);
328
329 if(ret) {
330 #ifdef MBEDTLS_ERROR_C
331 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
332 #endif /* MBEDTLS_ERROR_C */
333 failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
334 ssl_cert, -ret, errorbuf);
335
336 return CURLE_SSL_CERTPROBLEM;
337 }
338 }
339
340 /* Load the client private key */
341 mbedtls_pk_init(&BACKEND->pk);
342
343 if(SSL_SET_OPTION(key)) {
344 ret = mbedtls_pk_parse_keyfile(&BACKEND->pk, SSL_SET_OPTION(key),
345 SSL_SET_OPTION(key_passwd));
346 if(ret == 0 && !(mbedtls_pk_can_do(&BACKEND->pk, MBEDTLS_PK_RSA) ||
347 mbedtls_pk_can_do(&BACKEND->pk, MBEDTLS_PK_ECKEY)))
348 ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
349
350 if(ret) {
351 #ifdef MBEDTLS_ERROR_C
352 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
353 #endif /* MBEDTLS_ERROR_C */
354 failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
355 SSL_SET_OPTION(key), -ret, errorbuf);
356
357 return CURLE_SSL_CERTPROBLEM;
358 }
359 }
360
361 /* Load the CRL */
362 mbedtls_x509_crl_init(&BACKEND->crl);
363
364 if(ssl_crlfile) {
365 ret = mbedtls_x509_crl_parse_file(&BACKEND->crl, ssl_crlfile);
366
367 if(ret) {
368 #ifdef MBEDTLS_ERROR_C
369 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
370 #endif /* MBEDTLS_ERROR_C */
371 failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
372 ssl_crlfile, -ret, errorbuf);
373
374 return CURLE_SSL_CRL_BADFILE;
375 }
376 }
377
378 infof(data, "mbedTLS: Connecting to %s:%ld\n", hostname, port);
379
380 mbedtls_ssl_config_init(&BACKEND->config);
381
382 mbedtls_ssl_init(&BACKEND->ssl);
383 if(mbedtls_ssl_setup(&BACKEND->ssl, &BACKEND->config)) {
384 failf(data, "mbedTLS: ssl_init failed");
385 return CURLE_SSL_CONNECT_ERROR;
386 }
387 ret = mbedtls_ssl_config_defaults(&BACKEND->config,
388 MBEDTLS_SSL_IS_CLIENT,
389 MBEDTLS_SSL_TRANSPORT_STREAM,
390 MBEDTLS_SSL_PRESET_DEFAULT);
391 if(ret) {
392 failf(data, "mbedTLS: ssl_config failed");
393 return CURLE_SSL_CONNECT_ERROR;
394 }
395
396 /* new profile with RSA min key len = 1024 ... */
397 mbedtls_ssl_conf_cert_profile(&BACKEND->config,
398 &mbedtls_x509_crt_profile_fr);
399
400 switch(SSL_CONN_CONFIG(version)) {
401 case CURL_SSLVERSION_DEFAULT:
402 case CURL_SSLVERSION_TLSv1:
403 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
404 MBEDTLS_SSL_MINOR_VERSION_1);
405 infof(data, "mbedTLS: Set min SSL version to TLS 1.0\n");
406 break;
407 case CURL_SSLVERSION_SSLv3:
408 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
409 MBEDTLS_SSL_MINOR_VERSION_0);
410 mbedtls_ssl_conf_max_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
411 MBEDTLS_SSL_MINOR_VERSION_0);
412 infof(data, "mbedTLS: Set SSL version to SSLv3\n");
413 break;
414 case CURL_SSLVERSION_TLSv1_0:
415 case CURL_SSLVERSION_TLSv1_1:
416 case CURL_SSLVERSION_TLSv1_2:
417 case CURL_SSLVERSION_TLSv1_3:
418 {
419 CURLcode result = set_ssl_version_min_max(conn, sockindex);
420 if(result != CURLE_OK)
421 return result;
422 break;
423 }
424 default:
425 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
426 return CURLE_SSL_CONNECT_ERROR;
427 }
428
429 mbedtls_ssl_conf_authmode(&BACKEND->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
430
431 mbedtls_ssl_conf_rng(&BACKEND->config, mbedtls_ctr_drbg_random,
432 &BACKEND->ctr_drbg);
433 mbedtls_ssl_set_bio(&BACKEND->ssl, &conn->sock[sockindex],
434 mbedtls_net_send,
435 mbedtls_net_recv,
436 NULL /* rev_timeout() */);
437
438 mbedtls_ssl_conf_ciphersuites(&BACKEND->config,
439 mbedtls_ssl_list_ciphersuites());
440
441 #if defined(MBEDTLS_SSL_RENEGOTIATION)
442 mbedtls_ssl_conf_renegotiation(&BACKEND->config,
443 MBEDTLS_SSL_RENEGOTIATION_ENABLED);
444 #endif
445
446 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
447 mbedtls_ssl_conf_session_tickets(&BACKEND->config,
448 MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
449 #endif
450
451 /* Check if there's a cached ID we can/should use here! */
452 if(SSL_SET_OPTION(primary.sessionid)) {
453 void *old_session = NULL;
454
455 Curl_ssl_sessionid_lock(conn);
456 if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
457 ret = mbedtls_ssl_set_session(&BACKEND->ssl, old_session);
458 if(ret) {
459 Curl_ssl_sessionid_unlock(conn);
460 failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
461 return CURLE_SSL_CONNECT_ERROR;
462 }
463 infof(data, "mbedTLS re-using session\n");
464 }
465 Curl_ssl_sessionid_unlock(conn);
466 }
467
468 mbedtls_ssl_conf_ca_chain(&BACKEND->config,
469 &BACKEND->cacert,
470 &BACKEND->crl);
471
472 if(SSL_SET_OPTION(key)) {
473 mbedtls_ssl_conf_own_cert(&BACKEND->config,
474 &BACKEND->clicert, &BACKEND->pk);
475 }
476 if(mbedtls_ssl_set_hostname(&BACKEND->ssl, hostname)) {
477 /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks *and*
478 the name to set in the SNI extension. So even if curl connects to a
479 host specified as an IP address, this function must be used. */
480 failf(data, "couldn't set hostname in mbedTLS");
481 return CURLE_SSL_CONNECT_ERROR;
482 }
483
484 #ifdef HAS_ALPN
485 if(conn->bits.tls_enable_alpn) {
486 const char **p = &BACKEND->protocols[0];
487 #ifdef USE_NGHTTP2
488 if(data->set.httpversion >= CURL_HTTP_VERSION_2)
489 *p++ = NGHTTP2_PROTO_VERSION_ID;
490 #endif
491 *p++ = ALPN_HTTP_1_1;
492 *p = NULL;
493 /* this function doesn't clone the protocols array, which is why we need
494 to keep it around */
495 if(mbedtls_ssl_conf_alpn_protocols(&BACKEND->config,
496 &BACKEND->protocols[0])) {
497 failf(data, "Failed setting ALPN protocols");
498 return CURLE_SSL_CONNECT_ERROR;
499 }
500 for(p = &BACKEND->protocols[0]; *p; ++p)
501 infof(data, "ALPN, offering %s\n", *p);
502 }
503 #endif
504
505 #ifdef MBEDTLS_DEBUG
506 /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
507 mbedtls_ssl_conf_dbg(&BACKEND->config, mbed_debug, data);
508 /* - 0 No debug
509 * - 1 Error
510 * - 2 State change
511 * - 3 Informational
512 * - 4 Verbose
513 */
514 mbedtls_debug_set_threshold(4);
515 #endif
516
517 /* give application a chance to interfere with mbedTLS set up. */
518 if(data->set.ssl.fsslctx) {
519 ret = (*data->set.ssl.fsslctx)(data, &BACKEND->config,
520 data->set.ssl.fsslctxp);
521 if(ret) {
522 failf(data, "error signaled by ssl ctx callback");
523 return ret;
524 }
525 }
526
527 connssl->connecting_state = ssl_connect_2;
528
529 return CURLE_OK;
530 }
531
532 static CURLcode
533 mbed_connect_step2(struct connectdata *conn,
534 int sockindex)
535 {
536 int ret;
537 struct Curl_easy *data = conn->data;
538 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
539 const mbedtls_x509_crt *peercert;
540 const char * const pinnedpubkey = SSL_IS_PROXY() ?
541 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
542 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
543
544 conn->recv[sockindex] = mbed_recv;
545 conn->send[sockindex] = mbed_send;
546
547 ret = mbedtls_ssl_handshake(&BACKEND->ssl);
548
549 if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
550 connssl->connecting_state = ssl_connect_2_reading;
551 return CURLE_OK;
552 }
553 else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
554 connssl->connecting_state = ssl_connect_2_writing;
555 return CURLE_OK;
556 }
557 else if(ret) {
558 char errorbuf[128];
559 errorbuf[0] = 0;
560 #ifdef MBEDTLS_ERROR_C
561 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
562 #endif /* MBEDTLS_ERROR_C */
563 failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
564 -ret, errorbuf);
565 return CURLE_SSL_CONNECT_ERROR;
566 }
567
568 infof(data, "mbedTLS: Handshake complete, cipher is %s\n",
569 mbedtls_ssl_get_ciphersuite(&BACKEND->ssl)
570 );
571
572 ret = mbedtls_ssl_get_verify_result(&BACKEND->ssl);
573
574 if(!SSL_CONN_CONFIG(verifyhost))
575 /* Ignore hostname errors if verifyhost is disabled */
576 ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH;
577
578 if(ret && SSL_CONN_CONFIG(verifypeer)) {
579 if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
580 failf(data, "Cert verify failed: BADCERT_EXPIRED");
581
582 else if(ret & MBEDTLS_X509_BADCERT_REVOKED)
583 failf(data, "Cert verify failed: BADCERT_REVOKED");
584
585 else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
586 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
587
588 else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
589 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
590
591 return CURLE_PEER_FAILED_VERIFICATION;
592 }
593
594 peercert = mbedtls_ssl_get_peer_cert(&BACKEND->ssl);
595
596 if(peercert && data->set.verbose) {
597 const size_t bufsize = 16384;
598 char *buffer = malloc(bufsize);
599
600 if(!buffer)
601 return CURLE_OUT_OF_MEMORY;
602
603 if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0)
604 infof(data, "Dumping cert info:\n%s\n", buffer);
605 else
606 infof(data, "Unable to dump certificate information.\n");
607
608 free(buffer);
609 }
610
611 if(pinnedpubkey) {
612 int size;
613 CURLcode result;
614 mbedtls_x509_crt *p;
615 unsigned char pubkey[PUB_DER_MAX_BYTES];
616
617 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
618 failf(data, "Failed due to missing peer certificate");
619 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
620 }
621
622 p = calloc(1, sizeof(*p));
623
624 if(!p)
625 return CURLE_OUT_OF_MEMORY;
626
627 mbedtls_x509_crt_init(p);
628
629 /* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der
630 needs a non-const key, for now.
631 https://github.com/ARMmbed/mbedtls/issues/396 */
632 if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
633 failf(data, "Failed copying peer certificate");
634 mbedtls_x509_crt_free(p);
635 free(p);
636 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
637 }
638
639 size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
640
641 if(size <= 0) {
642 failf(data, "Failed copying public key from peer certificate");
643 mbedtls_x509_crt_free(p);
644 free(p);
645 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
646 }
647
648 /* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */
649 result = Curl_pin_peer_pubkey(data,
650 pinnedpubkey,
651 &pubkey[PUB_DER_MAX_BYTES - size], size);
652 if(result) {
653 mbedtls_x509_crt_free(p);
654 free(p);
655 return result;
656 }
657
658 mbedtls_x509_crt_free(p);
659 free(p);
660 }
661
662 #ifdef HAS_ALPN
663 if(conn->bits.tls_enable_alpn) {
664 const char *next_protocol = mbedtls_ssl_get_alpn_protocol(&BACKEND->ssl);
665
666 if(next_protocol) {
667 infof(data, "ALPN, server accepted to use %s\n", next_protocol);
668 #ifdef USE_NGHTTP2
669 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
670 NGHTTP2_PROTO_VERSION_ID_LEN) &&
671 !next_protocol[NGHTTP2_PROTO_VERSION_ID_LEN]) {
672 conn->negnpn = CURL_HTTP_VERSION_2;
673 }
674 else
675 #endif
676 if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH) &&
677 !next_protocol[ALPN_HTTP_1_1_LENGTH]) {
678 conn->negnpn = CURL_HTTP_VERSION_1_1;
679 }
680 }
681 else {
682 infof(data, "ALPN, server did not agree to a protocol\n");
683 }
684 Curl_multiuse_state(conn, conn->negnpn == CURL_HTTP_VERSION_2 ?
685 BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
686 }
687 #endif
688
689 connssl->connecting_state = ssl_connect_3;
690 infof(data, "SSL connected\n");
691
692 return CURLE_OK;
693 }
694
695 static CURLcode
696 mbed_connect_step3(struct connectdata *conn,
697 int sockindex)
698 {
699 CURLcode retcode = CURLE_OK;
700 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
701 struct Curl_easy *data = conn->data;
702
703 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
704
705 if(SSL_SET_OPTION(primary.sessionid)) {
706 int ret;
707 mbedtls_ssl_session *our_ssl_sessionid;
708 void *old_ssl_sessionid = NULL;
709
710 our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
711 if(!our_ssl_sessionid)
712 return CURLE_OUT_OF_MEMORY;
713
714 mbedtls_ssl_session_init(our_ssl_sessionid);
715
716 ret = mbedtls_ssl_get_session(&BACKEND->ssl, our_ssl_sessionid);
717 if(ret) {
718 if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
719 mbedtls_ssl_session_free(our_ssl_sessionid);
720 free(our_ssl_sessionid);
721 failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
722 return CURLE_SSL_CONNECT_ERROR;
723 }
724
725 /* If there's already a matching session in the cache, delete it */
726 Curl_ssl_sessionid_lock(conn);
727 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
728 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
729
730 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
731 Curl_ssl_sessionid_unlock(conn);
732 if(retcode) {
733 mbedtls_ssl_session_free(our_ssl_sessionid);
734 free(our_ssl_sessionid);
735 failf(data, "failed to store ssl session");
736 return retcode;
737 }
738 }
739
740 connssl->connecting_state = ssl_connect_done;
741
742 return CURLE_OK;
743 }
744
745 static ssize_t mbed_send(struct connectdata *conn, int sockindex,
746 const void *mem, size_t len,
747 CURLcode *curlcode)
748 {
749 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
750 int ret = -1;
751
752 ret = mbedtls_ssl_write(&BACKEND->ssl,
753 (unsigned char *)mem, len);
754
755 if(ret < 0) {
756 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
757 CURLE_AGAIN : CURLE_SEND_ERROR;
758 ret = -1;
759 }
760
761 return ret;
762 }
763
764 static void Curl_mbedtls_close_all(struct Curl_easy *data)
765 {
766 (void)data;
767 }
768
769 static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
770 {
771 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
772 mbedtls_pk_free(&BACKEND->pk);
773 mbedtls_x509_crt_free(&BACKEND->clicert);
774 mbedtls_x509_crt_free(&BACKEND->cacert);
775 mbedtls_x509_crl_free(&BACKEND->crl);
776 mbedtls_ssl_config_free(&BACKEND->config);
777 mbedtls_ssl_free(&BACKEND->ssl);
778 mbedtls_ctr_drbg_free(&BACKEND->ctr_drbg);
779 #ifndef THREADING_SUPPORT
780 mbedtls_entropy_free(&BACKEND->entropy);
781 #endif /* THREADING_SUPPORT */
782 }
783
784 static ssize_t mbed_recv(struct connectdata *conn, int num,
785 char *buf, size_t buffersize,
786 CURLcode *curlcode)
787 {
788 struct ssl_connect_data *connssl = &conn->ssl[num];
789 int ret = -1;
790 ssize_t len = -1;
791
792 memset(buf, 0, buffersize);
793 ret = mbedtls_ssl_read(&BACKEND->ssl, (unsigned char *)buf,
794 buffersize);
795
796 if(ret <= 0) {
797 if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
798 return 0;
799
800 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
801 CURLE_AGAIN : CURLE_RECV_ERROR;
802 return -1;
803 }
804
805 len = ret;
806
807 return len;
808 }
809
810 static void Curl_mbedtls_session_free(void *ptr)
811 {
812 mbedtls_ssl_session_free(ptr);
813 free(ptr);
814 }
815
816 static size_t Curl_mbedtls_version(char *buffer, size_t size)
817 {
818 #ifdef MBEDTLS_VERSION_C
819 /* if mbedtls_version_get_number() is available it is better */
820 unsigned int version = mbedtls_version_get_number();
821 return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
822 (version>>16)&0xff, (version>>8)&0xff);
823 #else
824 return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
825 #endif
826 }
827
828 static CURLcode Curl_mbedtls_random(struct Curl_easy *data,
829 unsigned char *entropy, size_t length)
830 {
831 #if defined(MBEDTLS_CTR_DRBG_C)
832 int ret = -1;
833 char errorbuf[128];
834 mbedtls_entropy_context ctr_entropy;
835 mbedtls_ctr_drbg_context ctr_drbg;
836 mbedtls_entropy_init(&ctr_entropy);
837 mbedtls_ctr_drbg_init(&ctr_drbg);
838 errorbuf[0] = 0;
839
840 ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
841 &ctr_entropy, NULL, 0);
842
843 if(ret) {
844 #ifdef MBEDTLS_ERROR_C
845 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
846 #endif /* MBEDTLS_ERROR_C */
847 failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
848 -ret, errorbuf);
849 }
850 else {
851 ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
852
853 if(ret) {
854 #ifdef MBEDTLS_ERROR_C
855 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
856 #endif /* MBEDTLS_ERROR_C */
857 failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
858 -ret, errorbuf);
859 }
860 }
861
862 mbedtls_ctr_drbg_free(&ctr_drbg);
863 mbedtls_entropy_free(&ctr_entropy);
864
865 return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
866 #elif defined(MBEDTLS_HAVEGE_C)
867 mbedtls_havege_state hs;
868 mbedtls_havege_init(&hs);
869 mbedtls_havege_random(&hs, entropy, length);
870 mbedtls_havege_free(&hs);
871 return CURLE_OK;
872 #else
873 return CURLE_NOT_BUILT_IN;
874 #endif
875 }
876
877 static CURLcode
878 mbed_connect_common(struct connectdata *conn,
879 int sockindex,
880 bool nonblocking,
881 bool *done)
882 {
883 CURLcode retcode;
884 struct Curl_easy *data = conn->data;
885 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
886 curl_socket_t sockfd = conn->sock[sockindex];
887 long timeout_ms;
888 int what;
889
890 /* check if the connection has already been established */
891 if(ssl_connection_complete == connssl->state) {
892 *done = TRUE;
893 return CURLE_OK;
894 }
895
896 if(ssl_connect_1 == connssl->connecting_state) {
897 /* Find out how much more time we're allowed */
898 timeout_ms = Curl_timeleft(data, NULL, TRUE);
899
900 if(timeout_ms < 0) {
901 /* no need to continue if time already is up */
902 failf(data, "SSL connection timeout");
903 return CURLE_OPERATION_TIMEDOUT;
904 }
905 retcode = mbed_connect_step1(conn, sockindex);
906 if(retcode)
907 return retcode;
908 }
909
910 while(ssl_connect_2 == connssl->connecting_state ||
911 ssl_connect_2_reading == connssl->connecting_state ||
912 ssl_connect_2_writing == connssl->connecting_state) {
913
914 /* check allowed time left */
915 timeout_ms = Curl_timeleft(data, NULL, TRUE);
916
917 if(timeout_ms < 0) {
918 /* no need to continue if time already is up */
919 failf(data, "SSL connection timeout");
920 return CURLE_OPERATION_TIMEDOUT;
921 }
922
923 /* if ssl is expecting something, check if it's available. */
924 if(connssl->connecting_state == ssl_connect_2_reading
925 || connssl->connecting_state == ssl_connect_2_writing) {
926
927 curl_socket_t writefd = ssl_connect_2_writing ==
928 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
929 curl_socket_t readfd = ssl_connect_2_reading ==
930 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
931
932 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
933 nonblocking ? 0 : timeout_ms);
934 if(what < 0) {
935 /* fatal error */
936 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
937 return CURLE_SSL_CONNECT_ERROR;
938 }
939 else if(0 == what) {
940 if(nonblocking) {
941 *done = FALSE;
942 return CURLE_OK;
943 }
944 else {
945 /* timeout */
946 failf(data, "SSL connection timeout");
947 return CURLE_OPERATION_TIMEDOUT;
948 }
949 }
950 /* socket is readable or writable */
951 }
952
953 /* Run transaction, and return to the caller if it failed or if
954 * this connection is part of a multi handle and this loop would
955 * execute again. This permits the owner of a multi handle to
956 * abort a connection attempt before step2 has completed while
957 * ensuring that a client using select() or epoll() will always
958 * have a valid fdset to wait on.
959 */
960 retcode = mbed_connect_step2(conn, sockindex);
961 if(retcode || (nonblocking &&
962 (ssl_connect_2 == connssl->connecting_state ||
963 ssl_connect_2_reading == connssl->connecting_state ||
964 ssl_connect_2_writing == connssl->connecting_state)))
965 return retcode;
966
967 } /* repeat step2 until all transactions are done. */
968
969 if(ssl_connect_3 == connssl->connecting_state) {
970 retcode = mbed_connect_step3(conn, sockindex);
971 if(retcode)
972 return retcode;
973 }
974
975 if(ssl_connect_done == connssl->connecting_state) {
976 connssl->state = ssl_connection_complete;
977 conn->recv[sockindex] = mbed_recv;
978 conn->send[sockindex] = mbed_send;
979 *done = TRUE;
980 }
981 else
982 *done = FALSE;
983
984 /* Reset our connect state machine */
985 connssl->connecting_state = ssl_connect_1;
986
987 return CURLE_OK;
988 }
989
990 static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
991 int sockindex, bool *done)
992 {
993 return mbed_connect_common(conn, sockindex, TRUE, done);
994 }
995
996
997 static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
998 {
999 CURLcode retcode;
1000 bool done = FALSE;
1001
1002 retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
1003 if(retcode)
1004 return retcode;
1005
1006 DEBUGASSERT(done);
1007
1008 return CURLE_OK;
1009 }
1010
1011 /*
1012 * return 0 error initializing SSL
1013 * return 1 SSL initialized successfully
1014 */
1015 static int Curl_mbedtls_init(void)
1016 {
1017 return Curl_polarsslthreadlock_thread_setup();
1018 }
1019
1020 static void Curl_mbedtls_cleanup(void)
1021 {
1022 (void)Curl_polarsslthreadlock_thread_cleanup();
1023 }
1024
1025 static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
1026 int sockindex)
1027 {
1028 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1029 return mbedtls_ssl_get_bytes_avail(&BACKEND->ssl) != 0;
1030 }
1031
1032 static CURLcode Curl_mbedtls_sha256sum(const unsigned char *input,
1033 size_t inputlen,
1034 unsigned char *sha256sum,
1035 size_t sha256len UNUSED_PARAM)
1036 {
1037 (void)sha256len;
1038 #if MBEDTLS_VERSION_NUMBER < 0x02070000
1039 mbedtls_sha256(input, inputlen, sha256sum, 0);
1040 #else
1041 /* returns 0 on success, otherwise failure */
1042 if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
1043 return CURLE_BAD_FUNCTION_ARGUMENT;
1044 #endif
1045 return CURLE_OK;
1046 }
1047
1048 static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
1049 CURLINFO info UNUSED_PARAM)
1050 {
1051 (void)info;
1052 return &BACKEND->ssl;
1053 }
1054
1055 const struct Curl_ssl Curl_ssl_mbedtls = {
1056 { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1057
1058 SSLSUPP_CA_PATH |
1059 SSLSUPP_PINNEDPUBKEY |
1060 SSLSUPP_SSL_CTX,
1061
1062 sizeof(struct ssl_backend_data),
1063
1064 Curl_mbedtls_init, /* init */
1065 Curl_mbedtls_cleanup, /* cleanup */
1066 Curl_mbedtls_version, /* version */
1067 Curl_none_check_cxn, /* check_cxn */
1068 Curl_none_shutdown, /* shutdown */
1069 Curl_mbedtls_data_pending, /* data_pending */
1070 Curl_mbedtls_random, /* random */
1071 Curl_none_cert_status_request, /* cert_status_request */
1072 Curl_mbedtls_connect, /* connect */
1073 Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
1074 Curl_mbedtls_get_internals, /* get_internals */
1075 Curl_mbedtls_close, /* close_one */
1076 Curl_mbedtls_close_all, /* close_all */
1077 Curl_mbedtls_session_free, /* session_free */
1078 Curl_none_set_engine, /* set_engine */
1079 Curl_none_set_engine_default, /* set_engine_default */
1080 Curl_none_engines_list, /* engines_list */
1081 Curl_none_false_start, /* false_start */
1082 Curl_none_md5sum, /* md5sum */
1083 Curl_mbedtls_sha256sum /* sha256sum */
1084 };
1085
1086 #endif /* USE_MBEDTLS */