source: asp3_tinet_ecnl_arm/trunk/curl-7.57.0/lib/vtls/mbedtls.c@ 352

Last change on this file since 352 was 352, checked in by coas-nagasima, 6 years ago

arm向けASP3版ECNLを追加
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1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
9 * Copyright (C) 2012 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
10 *
11 * This software is licensed as described in the file COPYING, which
12 * you should have received as part of this distribution. The terms
13 * are also available at https://curl.haxx.se/docs/copyright.html.
14 *
15 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
16 * copies of the Software, and permit persons to whom the Software is
17 * furnished to do so, under the terms of the COPYING file.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ***************************************************************************/
23
24/*
25 * Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
26 * but vtls.c should ever call or use these functions.
27 *
28 */
29
30#include "curl_setup.h"
31
32#ifdef USE_MBEDTLS
33
34#include <mbedtls/version.h>
35#if MBEDTLS_VERSION_NUMBER >= 0x02040000
36#include <mbedtls/net_sockets.h>
37#else
38#include <mbedtls/net.h>
39#endif
40#include <mbedtls/ssl.h>
41#include <mbedtls/certs.h>
42#include <mbedtls/x509.h>
43
44#include <mbedtls/error.h>
45#include <mbedtls/entropy.h>
46#include <mbedtls/ctr_drbg.h>
47#include <mbedtls/sha256.h>
48
49#include "urldata.h"
50#include "sendf.h"
51#include "inet_pton.h"
52#include "mbedtls.h"
53#include "vtls.h"
54#include "parsedate.h"
55#include "connect.h" /* for the connect timeout */
56#include "select.h"
57#include "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
64struct 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)
85static mbedtls_entropy_context ts_entropy;
86
87static int entropy_init_initialized = 0;
88
89/* start of entropy_init_mutex() */
90static 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() */
103static 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
121static 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 */
149static 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
172static Curl_recv mbed_recv;
173static Curl_send mbed_send;
174
175static 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
193static CURLcode
194set_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 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
209 break;
210 }
211
212 switch(ssl_version_max) {
213 case CURL_SSLVERSION_MAX_NONE:
214 ssl_version_max = ssl_version << 16;
215 break;
216 case CURL_SSLVERSION_MAX_DEFAULT:
217 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
218 break;
219 }
220
221 result = mbedtls_version_from_curl(&mbedtls_ver_min, ssl_version);
222 if(result) {
223 failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
224 return result;
225 }
226 result = mbedtls_version_from_curl(&mbedtls_ver_max, ssl_version_max >> 16);
227 if(result) {
228 failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
229 return result;
230 }
231
232 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
233 mbedtls_ver_min);
234 mbedtls_ssl_conf_max_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
235 mbedtls_ver_max);
236
237 return result;
238}
239
240static CURLcode
241mbed_connect_step1(struct connectdata *conn,
242 int sockindex)
243{
244 struct Curl_easy *data = conn->data;
245 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
246 const char * const ssl_cafile = SSL_CONN_CONFIG(CAfile);
247 const bool verifypeer = SSL_CONN_CONFIG(verifypeer);
248 const char * const ssl_capath = SSL_CONN_CONFIG(CApath);
249 char * const ssl_cert = SSL_SET_OPTION(cert);
250 const char * const ssl_crlfile = SSL_SET_OPTION(CRLfile);
251 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
252 conn->host.name;
253 const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
254 int ret = -1;
255 char errorbuf[128];
256 errorbuf[0] = 0;
257
258 /* mbedTLS only supports SSLv3 and TLSv1 */
259 if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
260 failf(data, "mbedTLS does not support SSLv2");
261 return CURLE_SSL_CONNECT_ERROR;
262 }
263
264#ifdef THREADING_SUPPORT
265 entropy_init_mutex(&ts_entropy);
266 mbedtls_ctr_drbg_init(&BACKEND->ctr_drbg);
267
268 ret = mbedtls_ctr_drbg_seed(&BACKEND->ctr_drbg, entropy_func_mutex,
269 &ts_entropy, NULL, 0);
270 if(ret) {
271#ifdef MBEDTLS_ERROR_C
272 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
273#endif /* MBEDTLS_ERROR_C */
274 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
275 -ret, errorbuf);
276 }
277#else
278 mbedtls_entropy_init(&BACKEND->entropy);
279 mbedtls_ctr_drbg_init(&BACKEND->ctr_drbg);
280
281 ret = mbedtls_ctr_drbg_seed(&BACKEND->ctr_drbg, mbedtls_entropy_func,
282 &BACKEND->entropy, NULL, 0);
283 if(ret) {
284#ifdef MBEDTLS_ERROR_C
285 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
286#endif /* MBEDTLS_ERROR_C */
287 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
288 -ret, errorbuf);
289 }
290#endif /* THREADING_SUPPORT */
291
292 /* Load the trusted CA */
293 mbedtls_x509_crt_init(&BACKEND->cacert);
294
295 if(ssl_cafile) {
296 ret = mbedtls_x509_crt_parse_file(&BACKEND->cacert, ssl_cafile);
297
298 if(ret<0) {
299#ifdef MBEDTLS_ERROR_C
300 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
301#endif /* MBEDTLS_ERROR_C */
302 failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
303 ssl_cafile, -ret, errorbuf);
304
305 if(verifypeer)
306 return CURLE_SSL_CACERT_BADFILE;
307 }
308 }
309
310 if(ssl_capath) {
311 ret = mbedtls_x509_crt_parse_path(&BACKEND->cacert, ssl_capath);
312
313 if(ret<0) {
314#ifdef MBEDTLS_ERROR_C
315 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
316#endif /* MBEDTLS_ERROR_C */
317 failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
318 ssl_capath, -ret, errorbuf);
319
320 if(verifypeer)
321 return CURLE_SSL_CACERT_BADFILE;
322 }
323 }
324
325 /* Load the client certificate */
326 mbedtls_x509_crt_init(&BACKEND->clicert);
327
328 if(ssl_cert) {
329 ret = mbedtls_x509_crt_parse_file(&BACKEND->clicert, ssl_cert);
330
331 if(ret) {
332#ifdef MBEDTLS_ERROR_C
333 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
334#endif /* MBEDTLS_ERROR_C */
335 failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
336 ssl_cert, -ret, errorbuf);
337
338 return CURLE_SSL_CERTPROBLEM;
339 }
340 }
341
342 /* Load the client private key */
343 mbedtls_pk_init(&BACKEND->pk);
344
345 if(SSL_SET_OPTION(key)) {
346 ret = mbedtls_pk_parse_keyfile(&BACKEND->pk, SSL_SET_OPTION(key),
347 SSL_SET_OPTION(key_passwd));
348 if(ret == 0 && !mbedtls_pk_can_do(&BACKEND->pk, MBEDTLS_PK_RSA))
349 ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
350
351 if(ret) {
352#ifdef MBEDTLS_ERROR_C
353 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
354#endif /* MBEDTLS_ERROR_C */
355 failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
356 SSL_SET_OPTION(key), -ret, errorbuf);
357
358 return CURLE_SSL_CERTPROBLEM;
359 }
360 }
361
362 /* Load the CRL */
363 mbedtls_x509_crl_init(&BACKEND->crl);
364
365 if(ssl_crlfile) {
366 ret = mbedtls_x509_crl_parse_file(&BACKEND->crl, ssl_crlfile);
367
368 if(ret) {
369#ifdef MBEDTLS_ERROR_C
370 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
371#endif /* MBEDTLS_ERROR_C */
372 failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
373 ssl_crlfile, -ret, errorbuf);
374
375 return CURLE_SSL_CRL_BADFILE;
376 }
377 }
378
379 infof(data, "mbedTLS: Connecting to %s:%d\n", hostname, port);
380
381 mbedtls_ssl_config_init(&BACKEND->config);
382
383 mbedtls_ssl_init(&BACKEND->ssl);
384 if(mbedtls_ssl_setup(&BACKEND->ssl, &BACKEND->config)) {
385 failf(data, "mbedTLS: ssl_init failed");
386 return CURLE_SSL_CONNECT_ERROR;
387 }
388 ret = mbedtls_ssl_config_defaults(&BACKEND->config,
389 MBEDTLS_SSL_IS_CLIENT,
390 MBEDTLS_SSL_TRANSPORT_STREAM,
391 MBEDTLS_SSL_PRESET_DEFAULT);
392 if(ret) {
393 failf(data, "mbedTLS: ssl_config failed");
394 return CURLE_SSL_CONNECT_ERROR;
395 }
396
397 /* new profile with RSA min key len = 1024 ... */
398 mbedtls_ssl_conf_cert_profile(&BACKEND->config,
399 &mbedtls_x509_crt_profile_fr);
400
401 switch(SSL_CONN_CONFIG(version)) {
402 case CURL_SSLVERSION_DEFAULT:
403 case CURL_SSLVERSION_TLSv1:
404 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
405 MBEDTLS_SSL_MINOR_VERSION_1);
406 infof(data, "mbedTLS: Set min SSL version to TLS 1.0\n");
407 break;
408 case CURL_SSLVERSION_SSLv3:
409 mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
410 MBEDTLS_SSL_MINOR_VERSION_0);
411 mbedtls_ssl_conf_max_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
412 MBEDTLS_SSL_MINOR_VERSION_0);
413 infof(data, "mbedTLS: Set SSL version to SSLv3\n");
414 break;
415 case CURL_SSLVERSION_TLSv1_0:
416 case CURL_SSLVERSION_TLSv1_1:
417 case CURL_SSLVERSION_TLSv1_2:
418 case CURL_SSLVERSION_TLSv1_3:
419 {
420 CURLcode result = set_ssl_version_min_max(conn, sockindex);
421 if(result != CURLE_OK)
422 return result;
423 break;
424 }
425 default:
426 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
427 return CURLE_SSL_CONNECT_ERROR;
428 }
429
430 mbedtls_ssl_conf_authmode(&BACKEND->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
431
432 mbedtls_ssl_conf_rng(&BACKEND->config, mbedtls_ctr_drbg_random,
433 &BACKEND->ctr_drbg);
434 mbedtls_ssl_set_bio(&BACKEND->ssl, &conn->sock[sockindex],
435 mbedtls_net_send,
436 mbedtls_net_recv,
437 NULL /* rev_timeout() */);
438
439 mbedtls_ssl_conf_ciphersuites(&BACKEND->config,
440 mbedtls_ssl_list_ciphersuites());
441
442#if defined(MBEDTLS_SSL_RENEGOTIATION)
443 mbedtls_ssl_conf_renegotiation(&BACKEND->config,
444 MBEDTLS_SSL_RENEGOTIATION_ENABLED);
445#endif
446
447#if defined(MBEDTLS_SSL_SESSION_TICKETS)
448 mbedtls_ssl_conf_session_tickets(&BACKEND->config,
449 MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
450#endif
451
452 /* Check if there's a cached ID we can/should use here! */
453 if(SSL_SET_OPTION(primary.sessionid)) {
454 void *old_session = NULL;
455
456 Curl_ssl_sessionid_lock(conn);
457 if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
458 ret = mbedtls_ssl_set_session(&BACKEND->ssl, old_session);
459 if(ret) {
460 Curl_ssl_sessionid_unlock(conn);
461 failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
462 return CURLE_SSL_CONNECT_ERROR;
463 }
464 infof(data, "mbedTLS re-using session\n");
465 }
466 Curl_ssl_sessionid_unlock(conn);
467 }
468
469 mbedtls_ssl_conf_ca_chain(&BACKEND->config,
470 &BACKEND->cacert,
471 &BACKEND->crl);
472
473 if(SSL_SET_OPTION(key)) {
474 mbedtls_ssl_conf_own_cert(&BACKEND->config,
475 &BACKEND->clicert, &BACKEND->pk);
476 }
477 if(mbedtls_ssl_set_hostname(&BACKEND->ssl, hostname)) {
478 /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks *and*
479 the name to set in the SNI extension. So even if curl connects to a
480 host specified as an IP address, this function must be used. */
481 failf(data, "couldn't set hostname in mbedTLS");
482 return CURLE_SSL_CONNECT_ERROR;
483 }
484
485#ifdef HAS_ALPN
486 if(conn->bits.tls_enable_alpn) {
487 const char **p = &BACKEND->protocols[0];
488#ifdef USE_NGHTTP2
489 if(data->set.httpversion >= CURL_HTTP_VERSION_2)
490 *p++ = NGHTTP2_PROTO_VERSION_ID;
491#endif
492 *p++ = ALPN_HTTP_1_1;
493 *p = NULL;
494 /* this function doesn't clone the protocols array, which is why we need
495 to keep it around */
496 if(mbedtls_ssl_conf_alpn_protocols(&BACKEND->config,
497 &BACKEND->protocols[0])) {
498 failf(data, "Failed setting ALPN protocols");
499 return CURLE_SSL_CONNECT_ERROR;
500 }
501 for(p = &BACKEND->protocols[0]; *p; ++p)
502 infof(data, "ALPN, offering %s\n", *p);
503 }
504#endif
505
506#ifdef MBEDTLS_DEBUG
507 /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
508 mbedtls_ssl_conf_dbg(&BACKEND->config, mbed_debug, data);
509 /* - 0 No debug
510 * - 1 Error
511 * - 2 State change
512 * - 3 Informational
513 * - 4 Verbose
514 */
515 mbedtls_debug_set_threshold(4);
516#endif
517
518 /* give application a chance to interfere with mbedTLS set up. */
519 if(data->set.ssl.fsslctx) {
520 ret = (*data->set.ssl.fsslctx)(data, &BACKEND->config,
521 data->set.ssl.fsslctxp);
522 if(ret) {
523 failf(data, "error signaled by ssl ctx callback");
524 return ret;
525 }
526 }
527
528 connssl->connecting_state = ssl_connect_2;
529
530 return CURLE_OK;
531}
532
533static CURLcode
534mbed_connect_step2(struct connectdata *conn,
535 int sockindex)
536{
537 int ret;
538 struct Curl_easy *data = conn->data;
539 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
540 const mbedtls_x509_crt *peercert;
541 const char * const pinnedpubkey = SSL_IS_PROXY() ?
542 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
543 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
544
545#ifdef HAS_ALPN
546 const char *next_protocol;
547#endif
548
549 char errorbuf[128];
550 errorbuf[0] = 0;
551
552 conn->recv[sockindex] = mbed_recv;
553 conn->send[sockindex] = mbed_send;
554
555 ret = mbedtls_ssl_handshake(&BACKEND->ssl);
556
557 if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
558 connssl->connecting_state = ssl_connect_2_reading;
559 return CURLE_OK;
560 }
561 else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
562 connssl->connecting_state = ssl_connect_2_writing;
563 return CURLE_OK;
564 }
565 else if(ret) {
566#ifdef MBEDTLS_ERROR_C
567 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
568#endif /* MBEDTLS_ERROR_C */
569 failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
570 -ret, errorbuf);
571 return CURLE_SSL_CONNECT_ERROR;
572 }
573
574 infof(data, "mbedTLS: Handshake complete, cipher is %s\n",
575 mbedtls_ssl_get_ciphersuite(&BACKEND->ssl)
576 );
577
578 ret = mbedtls_ssl_get_verify_result(&BACKEND->ssl);
579
580 if(ret && SSL_CONN_CONFIG(verifypeer)) {
581 if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
582 failf(data, "Cert verify failed: BADCERT_EXPIRED");
583
584 if(ret & MBEDTLS_X509_BADCERT_REVOKED) {
585 failf(data, "Cert verify failed: BADCERT_REVOKED");
586 return CURLE_SSL_CACERT;
587 }
588
589 if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
590 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
591
592 if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
593 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
594
595 return CURLE_PEER_FAILED_VERIFICATION;
596 }
597
598 peercert = mbedtls_ssl_get_peer_cert(&BACKEND->ssl);
599
600 if(peercert && data->set.verbose) {
601 const size_t bufsize = 16384;
602 char *buffer = malloc(bufsize);
603
604 if(!buffer)
605 return CURLE_OUT_OF_MEMORY;
606
607 if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0)
608 infof(data, "Dumping cert info:\n%s\n", buffer);
609 else
610 infof(data, "Unable to dump certificate information.\n");
611
612 free(buffer);
613 }
614
615 if(pinnedpubkey) {
616 int size;
617 CURLcode result;
618 mbedtls_x509_crt *p;
619 unsigned char pubkey[PUB_DER_MAX_BYTES];
620
621 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
622 failf(data, "Failed due to missing peer certificate");
623 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
624 }
625
626 p = calloc(1, sizeof(*p));
627
628 if(!p)
629 return CURLE_OUT_OF_MEMORY;
630
631 mbedtls_x509_crt_init(p);
632
633 /* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der
634 needs a non-const key, for now.
635 https://github.com/ARMmbed/mbedtls/issues/396 */
636 if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
637 failf(data, "Failed copying peer certificate");
638 mbedtls_x509_crt_free(p);
639 free(p);
640 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
641 }
642
643 size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
644
645 if(size <= 0) {
646 failf(data, "Failed copying public key from peer certificate");
647 mbedtls_x509_crt_free(p);
648 free(p);
649 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
650 }
651
652 /* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */
653 result = Curl_pin_peer_pubkey(data,
654 pinnedpubkey,
655 &pubkey[PUB_DER_MAX_BYTES - size], size);
656 if(result) {
657 mbedtls_x509_crt_free(p);
658 free(p);
659 return result;
660 }
661
662 mbedtls_x509_crt_free(p);
663 free(p);
664 }
665
666#ifdef HAS_ALPN
667 if(conn->bits.tls_enable_alpn) {
668 next_protocol = mbedtls_ssl_get_alpn_protocol(&BACKEND->ssl);
669
670 if(next_protocol) {
671 infof(data, "ALPN, server accepted to use %s\n", next_protocol);
672#ifdef USE_NGHTTP2
673 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
674 NGHTTP2_PROTO_VERSION_ID_LEN) &&
675 !next_protocol[NGHTTP2_PROTO_VERSION_ID_LEN]) {
676 conn->negnpn = CURL_HTTP_VERSION_2;
677 }
678 else
679#endif
680 if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH) &&
681 !next_protocol[ALPN_HTTP_1_1_LENGTH]) {
682 conn->negnpn = CURL_HTTP_VERSION_1_1;
683 }
684 }
685 else {
686 infof(data, "ALPN, server did not agree to a protocol\n");
687 }
688 }
689#endif
690
691 connssl->connecting_state = ssl_connect_3;
692 infof(data, "SSL connected\n");
693
694 return CURLE_OK;
695}
696
697static CURLcode
698mbed_connect_step3(struct connectdata *conn,
699 int sockindex)
700{
701 CURLcode retcode = CURLE_OK;
702 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
703 struct Curl_easy *data = conn->data;
704
705 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
706
707 if(SSL_SET_OPTION(primary.sessionid)) {
708 int ret;
709 mbedtls_ssl_session *our_ssl_sessionid;
710 void *old_ssl_sessionid = NULL;
711
712 our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
713 if(!our_ssl_sessionid)
714 return CURLE_OUT_OF_MEMORY;
715
716 mbedtls_ssl_session_init(our_ssl_sessionid);
717
718 ret = mbedtls_ssl_get_session(&BACKEND->ssl, our_ssl_sessionid);
719 if(ret) {
720 free(our_ssl_sessionid);
721 failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
722 return CURLE_SSL_CONNECT_ERROR;
723 }
724
725 /* If there's already a matching session in the cache, delete it */
726 Curl_ssl_sessionid_lock(conn);
727 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
728 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
729
730 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
731 Curl_ssl_sessionid_unlock(conn);
732 if(retcode) {
733 free(our_ssl_sessionid);
734 failf(data, "failed to store ssl session");
735 return retcode;
736 }
737 }
738
739 connssl->connecting_state = ssl_connect_done;
740
741 return CURLE_OK;
742}
743
744static ssize_t mbed_send(struct connectdata *conn, int sockindex,
745 const void *mem, size_t len,
746 CURLcode *curlcode)
747{
748 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
749 int ret = -1;
750
751 ret = mbedtls_ssl_write(&BACKEND->ssl,
752 (unsigned char *)mem, len);
753
754 if(ret < 0) {
755 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
756 CURLE_AGAIN : CURLE_SEND_ERROR;
757 ret = -1;
758 }
759
760 return ret;
761}
762
763static void Curl_mbedtls_close_all(struct Curl_easy *data)
764{
765 (void)data;
766}
767
768static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
769{
770 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
771 mbedtls_pk_free(&BACKEND->pk);
772 mbedtls_x509_crt_free(&BACKEND->clicert);
773 mbedtls_x509_crt_free(&BACKEND->cacert);
774 mbedtls_x509_crl_free(&BACKEND->crl);
775 mbedtls_ssl_config_free(&BACKEND->config);
776 mbedtls_ssl_free(&BACKEND->ssl);
777 mbedtls_ctr_drbg_free(&BACKEND->ctr_drbg);
778#ifndef THREADING_SUPPORT
779 mbedtls_entropy_free(&BACKEND->entropy);
780#endif /* THREADING_SUPPORT */
781}
782
783static ssize_t mbed_recv(struct connectdata *conn, int num,
784 char *buf, size_t buffersize,
785 CURLcode *curlcode)
786{
787 struct ssl_connect_data *connssl = &conn->ssl[num];
788 int ret = -1;
789 ssize_t len = -1;
790
791 memset(buf, 0, buffersize);
792 ret = mbedtls_ssl_read(&BACKEND->ssl, (unsigned char *)buf,
793 buffersize);
794
795 if(ret <= 0) {
796 if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
797 return 0;
798
799 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
800 CURLE_AGAIN : CURLE_RECV_ERROR;
801 return -1;
802 }
803
804 len = ret;
805
806 return len;
807}
808
809static void Curl_mbedtls_session_free(void *ptr)
810{
811 mbedtls_ssl_session_free(ptr);
812 free(ptr);
813}
814
815static size_t Curl_mbedtls_version(char *buffer, size_t size)
816{
817 unsigned int version = mbedtls_version_get_number();
818 return snprintf(buffer, size, "mbedTLS/%d.%d.%d", version>>24,
819 (version>>16)&0xff, (version>>8)&0xff);
820}
821
822static CURLcode Curl_mbedtls_random(struct Curl_easy *data,
823 unsigned char *entropy, size_t length)
824{
825#if defined(MBEDTLS_CTR_DRBG_C)
826 int ret = -1;
827 char errorbuf[128];
828 mbedtls_entropy_context ctr_entropy;
829 mbedtls_ctr_drbg_context ctr_drbg;
830 mbedtls_entropy_init(&ctr_entropy);
831 mbedtls_ctr_drbg_init(&ctr_drbg);
832 errorbuf[0] = 0;
833
834 ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
835 &ctr_entropy, NULL, 0);
836
837 if(ret) {
838#ifdef MBEDTLS_ERROR_C
839 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
840#endif /* MBEDTLS_ERROR_C */
841 failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
842 -ret, errorbuf);
843 }
844 else {
845 ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
846
847 if(ret) {
848#ifdef MBEDTLS_ERROR_C
849 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
850#endif /* MBEDTLS_ERROR_C */
851 failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
852 -ret, errorbuf);
853 }
854 }
855
856 mbedtls_ctr_drbg_free(&ctr_drbg);
857 mbedtls_entropy_free(&ctr_entropy);
858
859 return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
860#elif defined(MBEDTLS_HAVEGE_C)
861 mbedtls_havege_state hs;
862 mbedtls_havege_init(&hs);
863 mbedtls_havege_random(&hs, entropy, length);
864 mbedtls_havege_free(&hs);
865 return CURLE_OK;
866#else
867 return CURLE_NOT_BUILT_IN;
868#endif
869}
870
871static CURLcode
872mbed_connect_common(struct connectdata *conn,
873 int sockindex,
874 bool nonblocking,
875 bool *done)
876{
877 CURLcode retcode;
878 struct Curl_easy *data = conn->data;
879 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
880 curl_socket_t sockfd = conn->sock[sockindex];
881 long timeout_ms;
882 int what;
883
884 /* check if the connection has already been established */
885 if(ssl_connection_complete == connssl->state) {
886 *done = TRUE;
887 return CURLE_OK;
888 }
889
890 if(ssl_connect_1 == connssl->connecting_state) {
891 /* Find out how much more time we're allowed */
892 timeout_ms = Curl_timeleft(data, NULL, TRUE);
893
894 if(timeout_ms < 0) {
895 /* no need to continue if time already is up */
896 failf(data, "SSL connection timeout");
897 return CURLE_OPERATION_TIMEDOUT;
898 }
899 retcode = mbed_connect_step1(conn, sockindex);
900 if(retcode)
901 return retcode;
902 }
903
904 while(ssl_connect_2 == connssl->connecting_state ||
905 ssl_connect_2_reading == connssl->connecting_state ||
906 ssl_connect_2_writing == connssl->connecting_state) {
907
908 /* check allowed time left */
909 timeout_ms = Curl_timeleft(data, NULL, TRUE);
910
911 if(timeout_ms < 0) {
912 /* no need to continue if time already is up */
913 failf(data, "SSL connection timeout");
914 return CURLE_OPERATION_TIMEDOUT;
915 }
916
917 /* if ssl is expecting something, check if it's available. */
918 if(connssl->connecting_state == ssl_connect_2_reading
919 || connssl->connecting_state == ssl_connect_2_writing) {
920
921 curl_socket_t writefd = ssl_connect_2_writing ==
922 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
923 curl_socket_t readfd = ssl_connect_2_reading ==
924 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
925
926 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
927 nonblocking ? 0 : timeout_ms);
928 if(what < 0) {
929 /* fatal error */
930 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
931 return CURLE_SSL_CONNECT_ERROR;
932 }
933 else if(0 == what) {
934 if(nonblocking) {
935 *done = FALSE;
936 return CURLE_OK;
937 }
938 else {
939 /* timeout */
940 failf(data, "SSL connection timeout");
941 return CURLE_OPERATION_TIMEDOUT;
942 }
943 }
944 /* socket is readable or writable */
945 }
946
947 /* Run transaction, and return to the caller if it failed or if
948 * this connection is part of a multi handle and this loop would
949 * execute again. This permits the owner of a multi handle to
950 * abort a connection attempt before step2 has completed while
951 * ensuring that a client using select() or epoll() will always
952 * have a valid fdset to wait on.
953 */
954 retcode = mbed_connect_step2(conn, sockindex);
955 if(retcode || (nonblocking &&
956 (ssl_connect_2 == connssl->connecting_state ||
957 ssl_connect_2_reading == connssl->connecting_state ||
958 ssl_connect_2_writing == connssl->connecting_state)))
959 return retcode;
960
961 } /* repeat step2 until all transactions are done. */
962
963 if(ssl_connect_3 == connssl->connecting_state) {
964 retcode = mbed_connect_step3(conn, sockindex);
965 if(retcode)
966 return retcode;
967 }
968
969 if(ssl_connect_done == connssl->connecting_state) {
970 connssl->state = ssl_connection_complete;
971 conn->recv[sockindex] = mbed_recv;
972 conn->send[sockindex] = mbed_send;
973 *done = TRUE;
974 }
975 else
976 *done = FALSE;
977
978 /* Reset our connect state machine */
979 connssl->connecting_state = ssl_connect_1;
980
981 return CURLE_OK;
982}
983
984static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
985 int sockindex, bool *done)
986{
987 return mbed_connect_common(conn, sockindex, TRUE, done);
988}
989
990
991static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
992{
993 CURLcode retcode;
994 bool done = FALSE;
995
996 retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
997 if(retcode)
998 return retcode;
999
1000 DEBUGASSERT(done);
1001
1002 return CURLE_OK;
1003}
1004
1005/*
1006 * return 0 error initializing SSL
1007 * return 1 SSL initialized successfully
1008 */
1009static int Curl_mbedtls_init(void)
1010{
1011 return Curl_polarsslthreadlock_thread_setup();
1012}
1013
1014static void Curl_mbedtls_cleanup(void)
1015{
1016 (void)Curl_polarsslthreadlock_thread_cleanup();
1017}
1018
1019static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
1020 int sockindex)
1021{
1022 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1023 return mbedtls_ssl_get_bytes_avail(&BACKEND->ssl) != 0;
1024}
1025
1026static void Curl_mbedtls_sha256sum(const unsigned char *input,
1027 size_t inputlen,
1028 unsigned char *sha256sum,
1029 size_t sha256len UNUSED_PARAM)
1030{
1031 (void)sha256len;
1032 mbedtls_sha256(input, inputlen, sha256sum, 0);
1033}
1034
1035static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
1036 CURLINFO info UNUSED_PARAM)
1037{
1038 (void)info;
1039 return &BACKEND->ssl;
1040}
1041
1042const struct Curl_ssl Curl_ssl_mbedtls = {
1043 { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1044
1045 1, /* have_ca_path */
1046 0, /* have_certinfo */
1047 1, /* have_pinnedpubkey */
1048 1, /* have_ssl_ctx */
1049 0, /* support_https_proxy */
1050
1051 sizeof(struct ssl_backend_data),
1052
1053 Curl_mbedtls_init, /* init */
1054 Curl_mbedtls_cleanup, /* cleanup */
1055 Curl_mbedtls_version, /* version */
1056 Curl_none_check_cxn, /* check_cxn */
1057 Curl_none_shutdown, /* shutdown */
1058 Curl_mbedtls_data_pending, /* data_pending */
1059 Curl_mbedtls_random, /* random */
1060 Curl_none_cert_status_request, /* cert_status_request */
1061 Curl_mbedtls_connect, /* connect */
1062 Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
1063 Curl_mbedtls_get_internals, /* get_internals */
1064 Curl_mbedtls_close, /* close_one */
1065 Curl_mbedtls_close_all, /* close_all */
1066 Curl_mbedtls_session_free, /* session_free */
1067 Curl_none_set_engine, /* set_engine */
1068 Curl_none_set_engine_default, /* set_engine_default */
1069 Curl_none_engines_list, /* engines_list */
1070 Curl_none_false_start, /* false_start */
1071 Curl_none_md5sum, /* md5sum */
1072 Curl_mbedtls_sha256sum /* sha256sum */
1073};
1074
1075#endif /* USE_MBEDTLS */
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