mbedtls.c@ 99371

Last change on this file since 99371 was 99344, checked in by vboxsync, 2 years ago
curl-8.0.1: Applied and adjusted our curl changes to 7.87.0 bugref:10417
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File size: 38.4 KB

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1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) Daniel Stenberg, <[email protected]>, et al.
9	* Copyright (C) Hoi-Ho Chan, <[email protected]>
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() */
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() */
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
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
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
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
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
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
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
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 */

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source: vbox/trunk/src/libs/curl-8.0.1/lib/vtls/mbedtls.c@ 99371

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