1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 * Copyright (C) Hoi-Ho Chan, <hoiho.chan@gmail.com>
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.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 * SPDX-License-Identifier: curl
23 *
24 ***************************************************************************/
25
26 /*
27 * Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
28 * but vtls.c should ever call or use these functions.
29 *
30 */
31
32 #include "curl_setup.h"
33
34 #ifdef USE_MBEDTLS
35
36 /* Define this to enable lots of debugging for mbedTLS */
37 /* #define MBEDTLS_DEBUG */
38
39 #include <mbedtls/version.h>
40 #if MBEDTLS_VERSION_NUMBER >= 0x02040000
41 #include <mbedtls/net_sockets.h>
42 #else
43 #include <mbedtls/net.h>
44 #endif
45 #include <mbedtls/ssl.h>
46 #include <mbedtls/x509.h>
47
48 #include <mbedtls/error.h>
49 #include <mbedtls/entropy.h>
50 #include <mbedtls/ctr_drbg.h>
51 #include <mbedtls/sha256.h>
52
53 #if MBEDTLS_VERSION_MAJOR >= 2
54 # ifdef MBEDTLS_DEBUG
55 # include <mbedtls/debug.h>
56 # endif
57 #endif
58
59 #include "urldata.h"
60 #include "sendf.h"
61 #include "inet_pton.h"
62 #include "mbedtls.h"
63 #include "vtls.h"
64 #include "vtls_int.h"
65 #include "parsedate.h"
66 #include "connect.h" /* for the connect timeout */
67 #include "select.h"
68 #include "multiif.h"
69 #include "mbedtls_threadlock.h"
70
71 /* The last 3 #include files should be in this order */
72 #include "curl_printf.h"
73 #include "curl_memory.h"
74 #include "memdebug.h"
75
76 /* ALPN for http2 */
77 #ifdef USE_HTTP2
78 # undef HAS_ALPN
79 # ifdef MBEDTLS_SSL_ALPN
80 # define HAS_ALPN
81 # endif
82 #endif
83
84 struct ssl_backend_data {
85 mbedtls_ctr_drbg_context ctr_drbg;
86 mbedtls_entropy_context entropy;
87 mbedtls_ssl_context ssl;
88 mbedtls_x509_crt cacert;
89 mbedtls_x509_crt clicert;
90 #ifdef MBEDTLS_X509_CRL_PARSE_C
91 mbedtls_x509_crl crl;
92 #endif
93 mbedtls_pk_context pk;
94 mbedtls_ssl_config config;
95 #ifdef HAS_ALPN
96 const char *protocols[3];
97 #endif
98 };
99
100 /* apply threading? */
101 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
102 #define THREADING_SUPPORT
103 #endif
104
105 #ifndef MBEDTLS_ERROR_C
106 #define mbedtls_strerror(a,b,c) b[0] = 0
107 #endif
108
109 #if defined(THREADING_SUPPORT)
110 static mbedtls_entropy_context ts_entropy;
111
112 static int entropy_init_initialized = 0;
113
114 /* start of entropy_init_mutex() */
entropy_init_mutex(mbedtls_entropy_context * ctx)115 static void entropy_init_mutex(mbedtls_entropy_context *ctx)
116 {
117 /* lock 0 = entropy_init_mutex() */
118 Curl_mbedtlsthreadlock_lock_function(0);
119 if(entropy_init_initialized == 0) {
120 mbedtls_entropy_init(ctx);
121 entropy_init_initialized = 1;
122 }
123 Curl_mbedtlsthreadlock_unlock_function(0);
124 }
125 /* end of entropy_init_mutex() */
126
127 /* start of entropy_func_mutex() */
entropy_func_mutex(void * data,unsigned char * output,size_t len)128 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
129 {
130 int ret;
131 /* lock 1 = entropy_func_mutex() */
132 Curl_mbedtlsthreadlock_lock_function(1);
133 ret = mbedtls_entropy_func(data, output, len);
134 Curl_mbedtlsthreadlock_unlock_function(1);
135
136 return ret;
137 }
138 /* end of entropy_func_mutex() */
139
140 #endif /* THREADING_SUPPORT */
141
142 #ifdef MBEDTLS_DEBUG
mbed_debug(void * context,int level,const char * f_name,int line_nb,const char * line)143 static void mbed_debug(void *context, int level, const char *f_name,
144 int line_nb, const char *line)
145 {
146 struct Curl_easy *data = NULL;
147
148 if(!context)
149 return;
150
151 data = (struct Curl_easy *)context;
152
153 infof(data, "%s", line);
154 (void) level;
155 }
156 #else
157 #endif
158
bio_cf_write(void * bio,const unsigned char * buf,size_t blen)159 static int bio_cf_write(void *bio, const unsigned char *buf, size_t blen)
160 {
161 struct Curl_cfilter *cf = bio;
162 struct Curl_easy *data = CF_DATA_CURRENT(cf);
163 ssize_t nwritten;
164 CURLcode result;
165
166 DEBUGASSERT(data);
167 nwritten = Curl_conn_cf_send(cf->next, data, (char *)buf, blen, &result);
168 DEBUGF(LOG_CF(data, cf, "bio_cf_out_write(len=%zu) -> %zd, err=%d",
169 blen, nwritten, result));
170 if(nwritten < 0 && CURLE_AGAIN == result) {
171 nwritten = MBEDTLS_ERR_SSL_WANT_WRITE;
172 }
173 return (int)nwritten;
174 }
175
bio_cf_read(void * bio,unsigned char * buf,size_t blen)176 static int bio_cf_read(void *bio, unsigned char *buf, size_t blen)
177 {
178 struct Curl_cfilter *cf = bio;
179 struct Curl_easy *data = CF_DATA_CURRENT(cf);
180 ssize_t nread;
181 CURLcode result;
182
183 DEBUGASSERT(data);
184 /* OpenSSL catches this case, so should we. */
185 if(!buf)
186 return 0;
187
188 nread = Curl_conn_cf_recv(cf->next, data, (char *)buf, blen, &result);
189 DEBUGF(LOG_CF(data, cf, "bio_cf_in_read(len=%zu) -> %zd, err=%d",
190 blen, nread, result));
191 if(nread < 0 && CURLE_AGAIN == result) {
192 nread = MBEDTLS_ERR_SSL_WANT_READ;
193 }
194 return (int)nread;
195 }
196
197 /*
198 * profile
199 */
200 static const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_fr =
201 {
202 /* Hashes from SHA-1 and above */
203 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA1) |
204 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_RIPEMD160) |
205 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA224) |
206 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA256) |
207 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA384) |
208 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA512),
209 0xFFFFFFF, /* Any PK alg */
210 0xFFFFFFF, /* Any curve */
211 1024, /* RSA min key len */
212 };
213
214 /* See https://tls.mbed.org/discussions/generic/
215 howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
216 */
217 #define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
218 #define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
219
220 #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
221 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
222
mbedtls_version_from_curl(int * mbedver,long version)223 static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
224 {
225 #if MBEDTLS_VERSION_NUMBER >= 0x03000000
226 switch(version) {
227 case CURL_SSLVERSION_TLSv1_0:
228 case CURL_SSLVERSION_TLSv1_1:
229 case CURL_SSLVERSION_TLSv1_2:
230 *mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
231 return CURLE_OK;
232 case CURL_SSLVERSION_TLSv1_3:
233 break;
234 }
235 #else
236 switch(version) {
237 case CURL_SSLVERSION_TLSv1_0:
238 *mbedver = MBEDTLS_SSL_MINOR_VERSION_1;
239 return CURLE_OK;
240 case CURL_SSLVERSION_TLSv1_1:
241 *mbedver = MBEDTLS_SSL_MINOR_VERSION_2;
242 return CURLE_OK;
243 case CURL_SSLVERSION_TLSv1_2:
244 *mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
245 return CURLE_OK;
246 case CURL_SSLVERSION_TLSv1_3:
247 break;
248 }
249 #endif
250
251 return CURLE_SSL_CONNECT_ERROR;
252 }
253
254 static CURLcode
set_ssl_version_min_max(struct Curl_cfilter * cf,struct Curl_easy * data)255 set_ssl_version_min_max(struct Curl_cfilter *cf, struct Curl_easy *data)
256 {
257 struct ssl_connect_data *connssl = cf->ctx;
258 struct ssl_backend_data *backend = connssl->backend;
259 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
260 #if MBEDTLS_VERSION_NUMBER >= 0x03000000
261 int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_3;
262 int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_3;
263 #else
264 int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_1;
265 int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_1;
266 #endif
267 long ssl_version = conn_config->version;
268 long ssl_version_max = conn_config->version_max;
269 CURLcode result = CURLE_OK;
270
271 DEBUGASSERT(backend);
272
273 switch(ssl_version) {
274 case CURL_SSLVERSION_DEFAULT:
275 case CURL_SSLVERSION_TLSv1:
276 ssl_version = CURL_SSLVERSION_TLSv1_0;
277 break;
278 }
279
280 switch(ssl_version_max) {
281 case CURL_SSLVERSION_MAX_NONE:
282 case CURL_SSLVERSION_MAX_DEFAULT:
283 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
284 break;
285 }
286
287 result = mbedtls_version_from_curl(&mbedtls_ver_min, ssl_version);
288 if(result) {
289 failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
290 return result;
291 }
292 result = mbedtls_version_from_curl(&mbedtls_ver_max, ssl_version_max >> 16);
293 if(result) {
294 failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
295 return result;
296 }
297
298 mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
299 mbedtls_ver_min);
300 mbedtls_ssl_conf_max_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
301 mbedtls_ver_max);
302
303 return result;
304 }
305
306 static CURLcode
mbed_connect_step1(struct Curl_cfilter * cf,struct Curl_easy * data)307 mbed_connect_step1(struct Curl_cfilter *cf, struct Curl_easy *data)
308 {
309 struct ssl_connect_data *connssl = cf->ctx;
310 struct ssl_backend_data *backend = connssl->backend;
311 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
312 const struct curl_blob *ca_info_blob = conn_config->ca_info_blob;
313 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
314 const char * const ssl_cafile =
315 /* CURLOPT_CAINFO_BLOB overrides CURLOPT_CAINFO */
316 (ca_info_blob ? NULL : conn_config->CAfile);
317 const bool verifypeer = conn_config->verifypeer;
318 const char * const ssl_capath = conn_config->CApath;
319 char * const ssl_cert = ssl_config->primary.clientcert;
320 const struct curl_blob *ssl_cert_blob = ssl_config->primary.cert_blob;
321 const char * const ssl_crlfile = ssl_config->primary.CRLfile;
322 const char *hostname = connssl->hostname;
323 int ret = -1;
324 char errorbuf[128];
325
326 DEBUGASSERT(backend);
327
328 if((conn_config->version == CURL_SSLVERSION_SSLv2) ||
329 (conn_config->version == CURL_SSLVERSION_SSLv3)) {
330 failf(data, "Not supported SSL version");
331 return CURLE_NOT_BUILT_IN;
332 }
333
334 #ifdef THREADING_SUPPORT
335 entropy_init_mutex(&ts_entropy);
336 mbedtls_ctr_drbg_init(&backend->ctr_drbg);
337
338 ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, entropy_func_mutex,
339 &ts_entropy, NULL, 0);
340 if(ret) {
341 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
342 failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
343 -ret, errorbuf);
344 return CURLE_FAILED_INIT;
345 }
346 #else
347 mbedtls_entropy_init(&backend->entropy);
348 mbedtls_ctr_drbg_init(&backend->ctr_drbg);
349
350 ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, mbedtls_entropy_func,
351 &backend->entropy, NULL, 0);
352 if(ret) {
353 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
354 failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
355 -ret, errorbuf);
356 return CURLE_FAILED_INIT;
357 }
358 #endif /* THREADING_SUPPORT */
359
360 /* Load the trusted CA */
361 mbedtls_x509_crt_init(&backend->cacert);
362
363 if(ca_info_blob && verifypeer) {
364 /* Unfortunately, mbedtls_x509_crt_parse() requires the data to be null
365 terminated even when provided the exact length, forcing us to waste
366 extra memory here. */
367 unsigned char *newblob = malloc(ca_info_blob->len + 1);
368 if(!newblob)
369 return CURLE_OUT_OF_MEMORY;
370 memcpy(newblob, ca_info_blob->data, ca_info_blob->len);
371 newblob[ca_info_blob->len] = 0; /* null terminate */
372 ret = mbedtls_x509_crt_parse(&backend->cacert, newblob,
373 ca_info_blob->len + 1);
374 free(newblob);
375 if(ret<0) {
376 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
377 failf(data, "Error importing ca cert blob - mbedTLS: (-0x%04X) %s",
378 -ret, errorbuf);
379 return CURLE_SSL_CERTPROBLEM;
380 }
381 }
382
383 if(ssl_cafile && verifypeer) {
384 #ifdef MBEDTLS_FS_IO
385 ret = mbedtls_x509_crt_parse_file(&backend->cacert, ssl_cafile);
386
387 if(ret<0) {
388 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
389 failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
390 ssl_cafile, -ret, errorbuf);
391 return CURLE_SSL_CACERT_BADFILE;
392 }
393 #else
394 failf(data, "mbedtls: functions that use the filesystem not built in");
395 return CURLE_NOT_BUILT_IN;
396 #endif
397 }
398
399 if(ssl_capath) {
400 #ifdef MBEDTLS_FS_IO
401 ret = mbedtls_x509_crt_parse_path(&backend->cacert, ssl_capath);
402
403 if(ret<0) {
404 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
405 failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
406 ssl_capath, -ret, errorbuf);
407
408 if(verifypeer)
409 return CURLE_SSL_CACERT_BADFILE;
410 }
411 #else
412 failf(data, "mbedtls: functions that use the filesystem not built in");
413 return CURLE_NOT_BUILT_IN;
414 #endif
415 }
416
417 /* Load the client certificate */
418 mbedtls_x509_crt_init(&backend->clicert);
419
420 if(ssl_cert) {
421 #ifdef MBEDTLS_FS_IO
422 ret = mbedtls_x509_crt_parse_file(&backend->clicert, ssl_cert);
423
424 if(ret) {
425 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
426 failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
427 ssl_cert, -ret, errorbuf);
428
429 return CURLE_SSL_CERTPROBLEM;
430 }
431 #else
432 failf(data, "mbedtls: functions that use the filesystem not built in");
433 return CURLE_NOT_BUILT_IN;
434 #endif
435 }
436
437 if(ssl_cert_blob) {
438 /* Unfortunately, mbedtls_x509_crt_parse() requires the data to be null
439 terminated even when provided the exact length, forcing us to waste
440 extra memory here. */
441 unsigned char *newblob = malloc(ssl_cert_blob->len + 1);
442 if(!newblob)
443 return CURLE_OUT_OF_MEMORY;
444 memcpy(newblob, ssl_cert_blob->data, ssl_cert_blob->len);
445 newblob[ssl_cert_blob->len] = 0; /* null terminate */
446 ret = mbedtls_x509_crt_parse(&backend->clicert, newblob,
447 ssl_cert_blob->len + 1);
448 free(newblob);
449
450 if(ret) {
451 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
452 failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
453 ssl_config->key, -ret, errorbuf);
454 return CURLE_SSL_CERTPROBLEM;
455 }
456 }
457
458 /* Load the client private key */
459 mbedtls_pk_init(&backend->pk);
460
461 if(ssl_config->key || ssl_config->key_blob) {
462 if(ssl_config->key) {
463 #ifdef MBEDTLS_FS_IO
464 #if MBEDTLS_VERSION_NUMBER >= 0x03000000
465 ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
466 ssl_config->key_passwd,
467 mbedtls_ctr_drbg_random,
468 &backend->ctr_drbg);
469 #else
470 ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
471 ssl_config->key_passwd);
472 #endif
473
474 if(ret) {
475 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
476 failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
477 ssl_config->key, -ret, errorbuf);
478 return CURLE_SSL_CERTPROBLEM;
479 }
480 #else
481 failf(data, "mbedtls: functions that use the filesystem not built in");
482 return CURLE_NOT_BUILT_IN;
483 #endif
484 }
485 else {
486 const struct curl_blob *ssl_key_blob = ssl_config->key_blob;
487 const unsigned char *key_data =
488 (const unsigned char *)ssl_key_blob->data;
489 const char *passwd = ssl_config->key_passwd;
490 #if MBEDTLS_VERSION_NUMBER >= 0x03000000
491 ret = mbedtls_pk_parse_key(&backend->pk, key_data, ssl_key_blob->len,
492 (const unsigned char *)passwd,
493 passwd ? strlen(passwd) : 0,
494 mbedtls_ctr_drbg_random,
495 &backend->ctr_drbg);
496 #else
497 ret = mbedtls_pk_parse_key(&backend->pk, key_data, ssl_key_blob->len,
498 (const unsigned char *)passwd,
499 passwd ? strlen(passwd) : 0);
500 #endif
501
502 if(ret) {
503 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
504 failf(data, "Error parsing private key - mbedTLS: (-0x%04X) %s",
505 -ret, errorbuf);
506 return CURLE_SSL_CERTPROBLEM;
507 }
508 }
509
510 if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) ||
511 mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_ECKEY)))
512 ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
513 }
514
515 /* Load the CRL */
516 #ifdef MBEDTLS_X509_CRL_PARSE_C
517 mbedtls_x509_crl_init(&backend->crl);
518
519 if(ssl_crlfile) {
520 #ifdef MBEDTLS_FS_IO
521 ret = mbedtls_x509_crl_parse_file(&backend->crl, ssl_crlfile);
522
523 if(ret) {
524 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
525 failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
526 ssl_crlfile, -ret, errorbuf);
527
528 return CURLE_SSL_CRL_BADFILE;
529 }
530 #else
531 failf(data, "mbedtls: functions that use the filesystem not built in");
532 return CURLE_NOT_BUILT_IN;
533 #endif
534 }
535 #else
536 if(ssl_crlfile) {
537 failf(data, "mbedtls: crl support not built in");
538 return CURLE_NOT_BUILT_IN;
539 }
540 #endif
541
542 infof(data, "mbedTLS: Connecting to %s:%d", hostname, connssl->port);
543
544 mbedtls_ssl_config_init(&backend->config);
545 ret = mbedtls_ssl_config_defaults(&backend->config,
546 MBEDTLS_SSL_IS_CLIENT,
547 MBEDTLS_SSL_TRANSPORT_STREAM,
548 MBEDTLS_SSL_PRESET_DEFAULT);
549 if(ret) {
550 failf(data, "mbedTLS: ssl_config failed");
551 return CURLE_SSL_CONNECT_ERROR;
552 }
553
554 mbedtls_ssl_init(&backend->ssl);
555 if(mbedtls_ssl_setup(&backend->ssl, &backend->config)) {
556 failf(data, "mbedTLS: ssl_init failed");
557 return CURLE_SSL_CONNECT_ERROR;
558 }
559
560 /* new profile with RSA min key len = 1024 ... */
561 mbedtls_ssl_conf_cert_profile(&backend->config,
562 &mbedtls_x509_crt_profile_fr);
563
564 switch(conn_config->version) {
565 case CURL_SSLVERSION_DEFAULT:
566 case CURL_SSLVERSION_TLSv1:
567 #if MBEDTLS_VERSION_NUMBER < 0x03000000
568 mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
569 MBEDTLS_SSL_MINOR_VERSION_1);
570 infof(data, "mbedTLS: Set min SSL version to TLS 1.0");
571 break;
572 #endif
573 case CURL_SSLVERSION_TLSv1_0:
574 case CURL_SSLVERSION_TLSv1_1:
575 case CURL_SSLVERSION_TLSv1_2:
576 case CURL_SSLVERSION_TLSv1_3:
577 {
578 CURLcode result = set_ssl_version_min_max(cf, data);
579 if(result != CURLE_OK)
580 return result;
581 break;
582 }
583 default:
584 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
585 return CURLE_SSL_CONNECT_ERROR;
586 }
587
588 mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
589
590 mbedtls_ssl_conf_rng(&backend->config, mbedtls_ctr_drbg_random,
591 &backend->ctr_drbg);
592 mbedtls_ssl_set_bio(&backend->ssl, cf, bio_cf_write, bio_cf_read,
593 NULL /* rev_timeout() */);
594
595 mbedtls_ssl_conf_ciphersuites(&backend->config,
596 mbedtls_ssl_list_ciphersuites());
597
598 #if defined(MBEDTLS_SSL_RENEGOTIATION)
599 mbedtls_ssl_conf_renegotiation(&backend->config,
600 MBEDTLS_SSL_RENEGOTIATION_ENABLED);
601 #endif
602
603 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
604 mbedtls_ssl_conf_session_tickets(&backend->config,
605 MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
606 #endif
607
608 /* Check if there's a cached ID we can/should use here! */
609 if(ssl_config->primary.sessionid) {
610 void *old_session = NULL;
611
612 Curl_ssl_sessionid_lock(data);
613 if(!Curl_ssl_getsessionid(cf, data, &old_session, NULL)) {
614 ret = mbedtls_ssl_set_session(&backend->ssl, old_session);
615 if(ret) {
616 Curl_ssl_sessionid_unlock(data);
617 failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
618 return CURLE_SSL_CONNECT_ERROR;
619 }
620 infof(data, "mbedTLS re-using session");
621 }
622 Curl_ssl_sessionid_unlock(data);
623 }
624
625 mbedtls_ssl_conf_ca_chain(&backend->config,
626 &backend->cacert,
627 #ifdef MBEDTLS_X509_CRL_PARSE_C
628 &backend->crl);
629 #else
630 NULL);
631 #endif
632
633 if(ssl_config->key || ssl_config->key_blob) {
634 mbedtls_ssl_conf_own_cert(&backend->config,
635 &backend->clicert, &backend->pk);
636 }
637 {
638 char *snihost = Curl_ssl_snihost(data, hostname, NULL);
639 if(!snihost || mbedtls_ssl_set_hostname(&backend->ssl, snihost)) {
640 /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks and
641 the name to set in the SNI extension. So even if curl connects to a
642 host specified as an IP address, this function must be used. */
643 failf(data, "Failed to set SNI");
644 return CURLE_SSL_CONNECT_ERROR;
645 }
646 }
647
648 #ifdef HAS_ALPN
649 if(connssl->alpn) {
650 struct alpn_proto_buf proto;
651 size_t i;
652
653 for(i = 0; i < connssl->alpn->count; ++i) {
654 backend->protocols[i] = connssl->alpn->entries[i];
655 }
656 /* this function doesn't clone the protocols array, which is why we need
657 to keep it around */
658 if(mbedtls_ssl_conf_alpn_protocols(&backend->config,
659 &backend->protocols[0])) {
660 failf(data, "Failed setting ALPN protocols");
661 return CURLE_SSL_CONNECT_ERROR;
662 }
663 Curl_alpn_to_proto_str(&proto, connssl->alpn);
664 infof(data, VTLS_INFOF_ALPN_OFFER_1STR, proto.data);
665 }
666 #endif
667
668 #ifdef MBEDTLS_DEBUG
669 /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
670 mbedtls_ssl_conf_dbg(&backend->config, mbed_debug, data);
671 /* - 0 No debug
672 * - 1 Error
673 * - 2 State change
674 * - 3 Informational
675 * - 4 Verbose
676 */
677 mbedtls_debug_set_threshold(4);
678 #endif
679
680 /* give application a chance to interfere with mbedTLS set up. */
681 if(data->set.ssl.fsslctx) {
682 ret = (*data->set.ssl.fsslctx)(data, &backend->config,
683 data->set.ssl.fsslctxp);
684 if(ret) {
685 failf(data, "error signaled by ssl ctx callback");
686 return ret;
687 }
688 }
689
690 connssl->connecting_state = ssl_connect_2;
691
692 return CURLE_OK;
693 }
694
695 static CURLcode
mbed_connect_step2(struct Curl_cfilter * cf,struct Curl_easy * data)696 mbed_connect_step2(struct Curl_cfilter *cf, struct Curl_easy *data)
697 {
698 int ret;
699 struct ssl_connect_data *connssl = cf->ctx;
700 struct ssl_backend_data *backend = connssl->backend;
701 struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
702 const mbedtls_x509_crt *peercert;
703 const char * const pinnedpubkey = Curl_ssl_cf_is_proxy(cf)?
704 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY]:
705 data->set.str[STRING_SSL_PINNEDPUBLICKEY];
706
707 DEBUGASSERT(backend);
708
709 ret = mbedtls_ssl_handshake(&backend->ssl);
710
711 if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
712 connssl->connecting_state = ssl_connect_2_reading;
713 return CURLE_OK;
714 }
715 else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
716 connssl->connecting_state = ssl_connect_2_writing;
717 return CURLE_OK;
718 }
719 else if(ret) {
720 char errorbuf[128];
721 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
722 failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
723 -ret, errorbuf);
724 return CURLE_SSL_CONNECT_ERROR;
725 }
726
727 infof(data, "mbedTLS: Handshake complete, cipher is %s",
728 mbedtls_ssl_get_ciphersuite(&backend->ssl));
729
730 ret = mbedtls_ssl_get_verify_result(&backend->ssl);
731
732 if(!conn_config->verifyhost)
733 /* Ignore hostname errors if verifyhost is disabled */
734 ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH;
735
736 if(ret && conn_config->verifypeer) {
737 if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
738 failf(data, "Cert verify failed: BADCERT_EXPIRED");
739
740 else if(ret & MBEDTLS_X509_BADCERT_REVOKED)
741 failf(data, "Cert verify failed: BADCERT_REVOKED");
742
743 else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
744 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
745
746 else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
747 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
748
749 else if(ret & MBEDTLS_X509_BADCERT_FUTURE)
750 failf(data, "Cert verify failed: BADCERT_FUTURE");
751
752 return CURLE_PEER_FAILED_VERIFICATION;
753 }
754
755 peercert = mbedtls_ssl_get_peer_cert(&backend->ssl);
756
757 if(peercert && data->set.verbose) {
758 const size_t bufsize = 16384;
759 char *buffer = malloc(bufsize);
760
761 if(!buffer)
762 return CURLE_OUT_OF_MEMORY;
763
764 if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0)
765 infof(data, "Dumping cert info: %s", buffer);
766 else
767 infof(data, "Unable to dump certificate information");
768
769 free(buffer);
770 }
771
772 if(pinnedpubkey) {
773 int size;
774 CURLcode result;
775 mbedtls_x509_crt *p = NULL;
776 unsigned char *pubkey = NULL;
777
778 #if MBEDTLS_VERSION_NUMBER == 0x03000000
779 if(!peercert || !peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(p) ||
780 !peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(len)) {
781 #else
782 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
783 #endif
784 failf(data, "Failed due to missing peer certificate");
785 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
786 }
787
788 p = calloc(1, sizeof(*p));
789
790 if(!p)
791 return CURLE_OUT_OF_MEMORY;
792
793 pubkey = malloc(PUB_DER_MAX_BYTES);
794
795 if(!pubkey) {
796 result = CURLE_OUT_OF_MEMORY;
797 goto pinnedpubkey_error;
798 }
799
800 mbedtls_x509_crt_init(p);
801
802 /* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der
803 needs a non-const key, for now.
804 https://github.com/ARMmbed/mbedtls/issues/396 */
805 #if MBEDTLS_VERSION_NUMBER == 0x03000000
806 if(mbedtls_x509_crt_parse_der(p,
807 peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(p),
808 peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(len))) {
809 #else
810 if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
811 #endif
812 failf(data, "Failed copying peer certificate");
813 result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
814 goto pinnedpubkey_error;
815 }
816
817 #if MBEDTLS_VERSION_NUMBER == 0x03000000
818 size = mbedtls_pk_write_pubkey_der(&p->MBEDTLS_PRIVATE(pk), pubkey,
819 PUB_DER_MAX_BYTES);
820 #else
821 size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
822 #endif
823
824 if(size <= 0) {
825 failf(data, "Failed copying public key from peer certificate");
826 result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
827 goto pinnedpubkey_error;
828 }
829
830 /* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */
831 result = Curl_pin_peer_pubkey(data,
832 pinnedpubkey,
833 &pubkey[PUB_DER_MAX_BYTES - size], size);
834 pinnedpubkey_error:
835 mbedtls_x509_crt_free(p);
836 free(p);
837 free(pubkey);
838 if(result) {
839 return result;
840 }
841 }
842
843 #ifdef HAS_ALPN
844 if(connssl->alpn) {
845 const char *proto = mbedtls_ssl_get_alpn_protocol(&backend->ssl);
846
847 Curl_alpn_set_negotiated(cf, data, (const unsigned char *)proto,
848 proto? strlen(proto) : 0);
849 }
850 #endif
851
852 connssl->connecting_state = ssl_connect_3;
853 infof(data, "SSL connected");
854
855 return CURLE_OK;
856 }
857
858 static CURLcode
859 mbed_connect_step3(struct Curl_cfilter *cf, struct Curl_easy *data)
860 {
861 CURLcode retcode = CURLE_OK;
862 struct ssl_connect_data *connssl = cf->ctx;
863 struct ssl_backend_data *backend = connssl->backend;
864 struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
865
866 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
867 DEBUGASSERT(backend);
868
869 if(ssl_config->primary.sessionid) {
870 int ret;
871 mbedtls_ssl_session *our_ssl_sessionid;
872 void *old_ssl_sessionid = NULL;
873 bool added = FALSE;
874
875 our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
876 if(!our_ssl_sessionid)
877 return CURLE_OUT_OF_MEMORY;
878
879 mbedtls_ssl_session_init(our_ssl_sessionid);
880
881 ret = mbedtls_ssl_get_session(&backend->ssl, our_ssl_sessionid);
882 if(ret) {
883 if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
884 mbedtls_ssl_session_free(our_ssl_sessionid);
885 free(our_ssl_sessionid);
886 failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
887 return CURLE_SSL_CONNECT_ERROR;
888 }
889
890 /* If there's already a matching session in the cache, delete it */
891 Curl_ssl_sessionid_lock(data);
892 if(!Curl_ssl_getsessionid(cf, data, &old_ssl_sessionid, NULL))
893 Curl_ssl_delsessionid(data, old_ssl_sessionid);
894
895 retcode = Curl_ssl_addsessionid(cf, data, our_ssl_sessionid,
896 0, &added);
897 Curl_ssl_sessionid_unlock(data);
898 if(!added) {
899 mbedtls_ssl_session_free(our_ssl_sessionid);
900 free(our_ssl_sessionid);
901 }
902 if(retcode) {
903 failf(data, "failed to store ssl session");
904 return retcode;
905 }
906 }
907
908 connssl->connecting_state = ssl_connect_done;
909
910 return CURLE_OK;
911 }
912
913 static ssize_t mbed_send(struct Curl_cfilter *cf, struct Curl_easy *data,
914 const void *mem, size_t len,
915 CURLcode *curlcode)
916 {
917 struct ssl_connect_data *connssl = cf->ctx;
918 struct ssl_backend_data *backend = connssl->backend;
919 int ret = -1;
920
921 (void)data;
922 DEBUGASSERT(backend);
923 ret = mbedtls_ssl_write(&backend->ssl, (unsigned char *)mem, len);
924
925 if(ret < 0) {
926 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
927 CURLE_AGAIN : CURLE_SEND_ERROR;
928 ret = -1;
929 }
930
931 return ret;
932 }
933
934 static void mbedtls_close_all(struct Curl_easy *data)
935 {
936 (void)data;
937 }
938
939 static void mbedtls_close(struct Curl_cfilter *cf, struct Curl_easy *data)
940 {
941 struct ssl_connect_data *connssl = cf->ctx;
942 struct ssl_backend_data *backend = connssl->backend;
943 char buf[32];
944
945 (void)data;
946 DEBUGASSERT(backend);
947
948 /* Maybe the server has already sent a close notify alert.
949 Read it to avoid an RST on the TCP connection. */
950 (void)mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf, sizeof(buf));
951
952 mbedtls_pk_free(&backend->pk);
953 mbedtls_x509_crt_free(&backend->clicert);
954 mbedtls_x509_crt_free(&backend->cacert);
955 #ifdef MBEDTLS_X509_CRL_PARSE_C
956 mbedtls_x509_crl_free(&backend->crl);
957 #endif
958 mbedtls_ssl_config_free(&backend->config);
959 mbedtls_ssl_free(&backend->ssl);
960 mbedtls_ctr_drbg_free(&backend->ctr_drbg);
961 #ifndef THREADING_SUPPORT
962 mbedtls_entropy_free(&backend->entropy);
963 #endif /* THREADING_SUPPORT */
964 }
965
966 static ssize_t mbed_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
967 char *buf, size_t buffersize,
968 CURLcode *curlcode)
969 {
970 struct ssl_connect_data *connssl = cf->ctx;
971 struct ssl_backend_data *backend = connssl->backend;
972 int ret = -1;
973 ssize_t len = -1;
974
975 (void)data;
976 DEBUGASSERT(backend);
977
978 ret = mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf,
979 buffersize);
980
981 if(ret <= 0) {
982 if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
983 return 0;
984
985 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
986 CURLE_AGAIN : CURLE_RECV_ERROR;
987 return -1;
988 }
989
990 len = ret;
991
992 return len;
993 }
994
995 static void mbedtls_session_free(void *ptr)
996 {
997 mbedtls_ssl_session_free(ptr);
998 free(ptr);
999 }
1000
1001 static size_t mbedtls_version(char *buffer, size_t size)
1002 {
1003 #ifdef MBEDTLS_VERSION_C
1004 /* if mbedtls_version_get_number() is available it is better */
1005 unsigned int version = mbedtls_version_get_number();
1006 return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
1007 (version>>16)&0xff, (version>>8)&0xff);
1008 #else
1009 return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
1010 #endif
1011 }
1012
1013 static CURLcode mbedtls_random(struct Curl_easy *data,
1014 unsigned char *entropy, size_t length)
1015 {
1016 #if defined(MBEDTLS_CTR_DRBG_C)
1017 int ret = -1;
1018 char errorbuf[128];
1019 mbedtls_entropy_context ctr_entropy;
1020 mbedtls_ctr_drbg_context ctr_drbg;
1021 mbedtls_entropy_init(&ctr_entropy);
1022 mbedtls_ctr_drbg_init(&ctr_drbg);
1023
1024 ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
1025 &ctr_entropy, NULL, 0);
1026
1027 if(ret) {
1028 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
1029 failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
1030 -ret, errorbuf);
1031 }
1032 else {
1033 ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
1034
1035 if(ret) {
1036 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
1037 failf(data, "mbedtls_ctr_drbg_random returned (-0x%04X) %s",
1038 -ret, errorbuf);
1039 }
1040 }
1041
1042 mbedtls_ctr_drbg_free(&ctr_drbg);
1043 mbedtls_entropy_free(&ctr_entropy);
1044
1045 return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
1046 #elif defined(MBEDTLS_HAVEGE_C)
1047 mbedtls_havege_state hs;
1048 mbedtls_havege_init(&hs);
1049 mbedtls_havege_random(&hs, entropy, length);
1050 mbedtls_havege_free(&hs);
1051 return CURLE_OK;
1052 #else
1053 return CURLE_NOT_BUILT_IN;
1054 #endif
1055 }
1056
1057 static CURLcode
1058 mbed_connect_common(struct Curl_cfilter *cf, struct Curl_easy *data,
1059 bool nonblocking,
1060 bool *done)
1061 {
1062 CURLcode retcode;
1063 struct ssl_connect_data *connssl = cf->ctx;
1064 curl_socket_t sockfd = Curl_conn_cf_get_socket(cf, data);
1065 timediff_t timeout_ms;
1066 int what;
1067
1068 /* check if the connection has already been established */
1069 if(ssl_connection_complete == connssl->state) {
1070 *done = TRUE;
1071 return CURLE_OK;
1072 }
1073
1074 if(ssl_connect_1 == connssl->connecting_state) {
1075 /* Find out how much more time we're allowed */
1076 timeout_ms = Curl_timeleft(data, NULL, TRUE);
1077
1078 if(timeout_ms < 0) {
1079 /* no need to continue if time already is up */
1080 failf(data, "SSL connection timeout");
1081 return CURLE_OPERATION_TIMEDOUT;
1082 }
1083 retcode = mbed_connect_step1(cf, data);
1084 if(retcode)
1085 return retcode;
1086 }
1087
1088 while(ssl_connect_2 == connssl->connecting_state ||
1089 ssl_connect_2_reading == connssl->connecting_state ||
1090 ssl_connect_2_writing == connssl->connecting_state) {
1091
1092 /* check allowed time left */
1093 timeout_ms = Curl_timeleft(data, NULL, TRUE);
1094
1095 if(timeout_ms < 0) {
1096 /* no need to continue if time already is up */
1097 failf(data, "SSL connection timeout");
1098 return CURLE_OPERATION_TIMEDOUT;
1099 }
1100
1101 /* if ssl is expecting something, check if it's available. */
1102 if(connssl->connecting_state == ssl_connect_2_reading
1103 || connssl->connecting_state == ssl_connect_2_writing) {
1104
1105 curl_socket_t writefd = ssl_connect_2_writing ==
1106 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
1107 curl_socket_t readfd = ssl_connect_2_reading ==
1108 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
1109
1110 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
1111 nonblocking ? 0 : timeout_ms);
1112 if(what < 0) {
1113 /* fatal error */
1114 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
1115 return CURLE_SSL_CONNECT_ERROR;
1116 }
1117 else if(0 == what) {
1118 if(nonblocking) {
1119 *done = FALSE;
1120 return CURLE_OK;
1121 }
1122 else {
1123 /* timeout */
1124 failf(data, "SSL connection timeout");
1125 return CURLE_OPERATION_TIMEDOUT;
1126 }
1127 }
1128 /* socket is readable or writable */
1129 }
1130
1131 /* Run transaction, and return to the caller if it failed or if
1132 * this connection is part of a multi handle and this loop would
1133 * execute again. This permits the owner of a multi handle to
1134 * abort a connection attempt before step2 has completed while
1135 * ensuring that a client using select() or epoll() will always
1136 * have a valid fdset to wait on.
1137 */
1138 retcode = mbed_connect_step2(cf, data);
1139 if(retcode || (nonblocking &&
1140 (ssl_connect_2 == connssl->connecting_state ||
1141 ssl_connect_2_reading == connssl->connecting_state ||
1142 ssl_connect_2_writing == connssl->connecting_state)))
1143 return retcode;
1144
1145 } /* repeat step2 until all transactions are done. */
1146
1147 if(ssl_connect_3 == connssl->connecting_state) {
1148 retcode = mbed_connect_step3(cf, data);
1149 if(retcode)
1150 return retcode;
1151 }
1152
1153 if(ssl_connect_done == connssl->connecting_state) {
1154 connssl->state = ssl_connection_complete;
1155 *done = TRUE;
1156 }
1157 else
1158 *done = FALSE;
1159
1160 /* Reset our connect state machine */
1161 connssl->connecting_state = ssl_connect_1;
1162
1163 return CURLE_OK;
1164 }
1165
1166 static CURLcode mbedtls_connect_nonblocking(struct Curl_cfilter *cf,
1167 struct Curl_easy *data,
1168 bool *done)
1169 {
1170 return mbed_connect_common(cf, data, TRUE, done);
1171 }
1172
1173
1174 static CURLcode mbedtls_connect(struct Curl_cfilter *cf,
1175 struct Curl_easy *data)
1176 {
1177 CURLcode retcode;
1178 bool done = FALSE;
1179
1180 retcode = mbed_connect_common(cf, data, FALSE, &done);
1181 if(retcode)
1182 return retcode;
1183
1184 DEBUGASSERT(done);
1185
1186 return CURLE_OK;
1187 }
1188
1189 /*
1190 * return 0 error initializing SSL
1191 * return 1 SSL initialized successfully
1192 */
1193 static int mbedtls_init(void)
1194 {
1195 return Curl_mbedtlsthreadlock_thread_setup();
1196 }
1197
1198 static void mbedtls_cleanup(void)
1199 {
1200 (void)Curl_mbedtlsthreadlock_thread_cleanup();
1201 }
1202
1203 static bool mbedtls_data_pending(struct Curl_cfilter *cf,
1204 const struct Curl_easy *data)
1205 {
1206 struct ssl_connect_data *ctx = cf->ctx;
1207
1208 (void)data;
1209 DEBUGASSERT(ctx && ctx->backend);
1210 return mbedtls_ssl_get_bytes_avail(&ctx->backend->ssl) != 0;
1211 }
1212
1213 static CURLcode mbedtls_sha256sum(const unsigned char *input,
1214 size_t inputlen,
1215 unsigned char *sha256sum,
1216 size_t sha256len UNUSED_PARAM)
1217 {
1218 /* TODO: explain this for different mbedtls 2.x vs 3 version */
1219 (void)sha256len;
1220 #if MBEDTLS_VERSION_NUMBER < 0x02070000
1221 mbedtls_sha256(input, inputlen, sha256sum, 0);
1222 #else
1223 /* returns 0 on success, otherwise failure */
1224 #if MBEDTLS_VERSION_NUMBER >= 0x03000000
1225 if(mbedtls_sha256(input, inputlen, sha256sum, 0) != 0)
1226 #else
1227 if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
1228 #endif
1229 return CURLE_BAD_FUNCTION_ARGUMENT;
1230 #endif
1231 return CURLE_OK;
1232 }
1233
1234 static void *mbedtls_get_internals(struct ssl_connect_data *connssl,
1235 CURLINFO info UNUSED_PARAM)
1236 {
1237 struct ssl_backend_data *backend = connssl->backend;
1238 (void)info;
1239 DEBUGASSERT(backend);
1240 return &backend->ssl;
1241 }
1242
1243 const struct Curl_ssl Curl_ssl_mbedtls = {
1244 { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1245
1246 SSLSUPP_CA_PATH |
1247 SSLSUPP_CAINFO_BLOB |
1248 SSLSUPP_PINNEDPUBKEY |
1249 SSLSUPP_SSL_CTX |
1250 SSLSUPP_HTTPS_PROXY,
1251
1252 sizeof(struct ssl_backend_data),
1253
1254 mbedtls_init, /* init */
1255 mbedtls_cleanup, /* cleanup */
1256 mbedtls_version, /* version */
1257 Curl_none_check_cxn, /* check_cxn */
1258 Curl_none_shutdown, /* shutdown */
1259 mbedtls_data_pending, /* data_pending */
1260 mbedtls_random, /* random */
1261 Curl_none_cert_status_request, /* cert_status_request */
1262 mbedtls_connect, /* connect */
1263 mbedtls_connect_nonblocking, /* connect_nonblocking */
1264 Curl_ssl_get_select_socks, /* getsock */
1265 mbedtls_get_internals, /* get_internals */
1266 mbedtls_close, /* close_one */
1267 mbedtls_close_all, /* close_all */
1268 mbedtls_session_free, /* session_free */
1269 Curl_none_set_engine, /* set_engine */
1270 Curl_none_set_engine_default, /* set_engine_default */
1271 Curl_none_engines_list, /* engines_list */
1272 Curl_none_false_start, /* false_start */
1273 mbedtls_sha256sum, /* sha256sum */
1274 NULL, /* associate_connection */
1275 NULL, /* disassociate_connection */
1276 NULL, /* free_multi_ssl_backend_data */
1277 mbed_recv, /* recv decrypted data */
1278 mbed_send, /* send data to encrypt */
1279 };
1280
1281 #endif /* USE_MBEDTLS */
1282