mbedtls.c@ 85671

Last change on this file since 85671 was 85671, checked in by vboxsync, 4 years ago
Export out internal curl copy to make it a lot simpler to build VBox (OSE) on Windows. bugref:9814
Property svn:eol-style set to `native`
File size: 31.7 KB

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

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source: vbox/trunk/src/libs/curl-7.64.0/lib/vtls/mbedtls.c@ 85671

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