1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
9 * Copyright (C) 2012 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
10 *
11 * This software is licensed as described in the file COPYING, which
12 * you should have received as part of this distribution. The terms
13 * are also available at https://curl.haxx.se/docs/copyright.html.
14 *
15 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
16 * copies of the Software, and permit persons to whom the Software is
17 * furnished to do so, under the terms of the COPYING file.
18 *
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
21 *
22 ***************************************************************************/
23
24 /*
25 * Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
26 * but vtls.c should ever call or use these functions.
27 *
28 */
29
30 #include "curl_setup.h"
31
32 #ifdef USE_MBEDTLS
33
34 #include <mbedtls/version.h>
35 #if MBEDTLS_VERSION_NUMBER >= 0x02040000
36 #include <mbedtls/net_sockets.h>
37 #else
38 #include <mbedtls/net.h>
39 #endif
40 #include <mbedtls/ssl.h>
41 #include <mbedtls/certs.h>
42 #include <mbedtls/x509.h>
43
44 #include <mbedtls/error.h>
45 #include <mbedtls/entropy.h>
46 #include <mbedtls/ctr_drbg.h>
47 #include <mbedtls/sha256.h>
48
49 #include "urldata.h"
50 #include "sendf.h"
51 #include "inet_pton.h"
52 #include "mbedtls.h"
53 #include "vtls.h"
54 #include "parsedate.h"
55 #include "connect.h" /* for the connect timeout */
56 #include "select.h"
57 #include "multiif.h"
58 #include "mbedtls_threadlock.h"
59
60 /* The last 3 #include files should be in this order */
61 #include "curl_printf.h"
62 #include "curl_memory.h"
63 #include "memdebug.h"
64
65 struct ssl_backend_data {
66 mbedtls_ctr_drbg_context ctr_drbg;
67 mbedtls_entropy_context entropy;
68 mbedtls_ssl_context ssl;
69 int server_fd;
70 mbedtls_x509_crt cacert;
71 mbedtls_x509_crt clicert;
72 mbedtls_x509_crl crl;
73 mbedtls_pk_context pk;
74 mbedtls_ssl_config config;
75 const char *protocols[3];
76 };
77
78 /* apply threading? */
79 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
80 #define THREADING_SUPPORT
81 #endif
82
83 #if defined(THREADING_SUPPORT)
84 static mbedtls_entropy_context ts_entropy;
85
86 static int entropy_init_initialized = 0;
87
88 /* start of entropy_init_mutex() */
entropy_init_mutex(mbedtls_entropy_context * ctx)89 static void entropy_init_mutex(mbedtls_entropy_context *ctx)
90 {
91 /* lock 0 = entropy_init_mutex() */
92 Curl_mbedtlsthreadlock_lock_function(0);
93 if(entropy_init_initialized == 0) {
94 mbedtls_entropy_init(ctx);
95 entropy_init_initialized = 1;
96 }
97 Curl_mbedtlsthreadlock_unlock_function(0);
98 }
99 /* end of entropy_init_mutex() */
100
101 /* start of entropy_func_mutex() */
entropy_func_mutex(void * data,unsigned char * output,size_t len)102 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
103 {
104 int ret;
105 /* lock 1 = entropy_func_mutex() */
106 Curl_mbedtlsthreadlock_lock_function(1);
107 ret = mbedtls_entropy_func(data, output, len);
108 Curl_mbedtlsthreadlock_unlock_function(1);
109
110 return ret;
111 }
112 /* end of entropy_func_mutex() */
113
114 #endif /* THREADING_SUPPORT */
115
116 /* Define this to enable lots of debugging for mbedTLS */
117 #undef MBEDTLS_DEBUG
118
119 #ifdef MBEDTLS_DEBUG
mbed_debug(void * context,int level,const char * f_name,int line_nb,const char * line)120 static void mbed_debug(void *context, int level, const char *f_name,
121 int line_nb, const char *line)
122 {
123 struct Curl_easy *data = NULL;
124
125 if(!context)
126 return;
127
128 data = (struct Curl_easy *)context;
129
130 infof(data, "%s", line);
131 (void) level;
132 }
133 #else
134 #endif
135
136 /* ALPN for http2? */
137 #ifdef USE_NGHTTP2
138 # undef HAS_ALPN
139 # ifdef MBEDTLS_SSL_ALPN
140 # define HAS_ALPN
141 # endif
142 #endif
143
144
145 /*
146 * profile
147 */
148 static const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_fr =
149 {
150 /* Hashes from SHA-1 and above */
151 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA1) |
152 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_RIPEMD160) |
153 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA224) |
154 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA256) |
155 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA384) |
156 MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA512),
157 0xFFFFFFF, /* Any PK alg */
158 0xFFFFFFF, /* Any curve */
159 1024, /* RSA min key len */
160 };
161
162 /* See https://tls.mbed.org/discussions/generic/
163 howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
164 */
165 #define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
166 #define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
167
168 #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
169 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
170
171 static Curl_recv mbed_recv;
172 static Curl_send mbed_send;
173
mbedtls_version_from_curl(int * mbedver,long version)174 static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
175 {
176 switch(version) {
177 case CURL_SSLVERSION_TLSv1_0:
178 *mbedver = MBEDTLS_SSL_MINOR_VERSION_1;
179 return CURLE_OK;
180 case CURL_SSLVERSION_TLSv1_1:
181 *mbedver = MBEDTLS_SSL_MINOR_VERSION_2;
182 return CURLE_OK;
183 case CURL_SSLVERSION_TLSv1_2:
184 *mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
185 return CURLE_OK;
186 case CURL_SSLVERSION_TLSv1_3:
187 break;
188 }
189 return CURLE_SSL_CONNECT_ERROR;
190 }
191
192 static CURLcode
set_ssl_version_min_max(struct connectdata * conn,int sockindex)193 set_ssl_version_min_max(struct connectdata *conn, int sockindex)
194 {
195 struct Curl_easy *data = conn->data;
196 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
197 struct ssl_backend_data *backend = connssl->backend;
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
mbed_connect_step1(struct connectdata * conn,int sockindex)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 struct ssl_backend_data *backend = connssl->backend;
244 const char * const ssl_cafile = SSL_CONN_CONFIG(CAfile);
245 const bool verifypeer = SSL_CONN_CONFIG(verifypeer);
246 const char * const ssl_capath = SSL_CONN_CONFIG(CApath);
247 char * const ssl_cert = SSL_SET_OPTION(cert);
248 const char * const ssl_crlfile = SSL_SET_OPTION(CRLfile);
249 #ifndef CURL_DISABLE_PROXY
250 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
251 conn->host.name;
252 const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
253 #else
254 const char * const hostname = conn->host.name;
255 const long int port = conn->remote_port;
256 #endif
257 int ret = -1;
258 char errorbuf[128];
259 errorbuf[0] = 0;
260
261 /* mbedTLS only supports SSLv3 and TLSv1 */
262 if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
263 failf(data, "mbedTLS does not support SSLv2");
264 return CURLE_SSL_CONNECT_ERROR;
265 }
266
267 #ifdef THREADING_SUPPORT
268 entropy_init_mutex(&ts_entropy);
269 mbedtls_ctr_drbg_init(&backend->ctr_drbg);
270
271 ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, entropy_func_mutex,
272 &ts_entropy, NULL, 0);
273 if(ret) {
274 #ifdef MBEDTLS_ERROR_C
275 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
276 #endif /* MBEDTLS_ERROR_C */
277 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
278 -ret, errorbuf);
279 }
280 #else
281 mbedtls_entropy_init(&backend->entropy);
282 mbedtls_ctr_drbg_init(&backend->ctr_drbg);
283
284 ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, mbedtls_entropy_func,
285 &backend->entropy, NULL, 0);
286 if(ret) {
287 #ifdef MBEDTLS_ERROR_C
288 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
289 #endif /* MBEDTLS_ERROR_C */
290 failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
291 -ret, errorbuf);
292 }
293 #endif /* THREADING_SUPPORT */
294
295 /* Load the trusted CA */
296 mbedtls_x509_crt_init(&backend->cacert);
297
298 if(ssl_cafile) {
299 ret = mbedtls_x509_crt_parse_file(&backend->cacert, ssl_cafile);
300
301 if(ret<0) {
302 #ifdef MBEDTLS_ERROR_C
303 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
304 #endif /* MBEDTLS_ERROR_C */
305 failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
306 ssl_cafile, -ret, errorbuf);
307
308 if(verifypeer)
309 return CURLE_SSL_CACERT_BADFILE;
310 }
311 }
312
313 if(ssl_capath) {
314 ret = mbedtls_x509_crt_parse_path(&backend->cacert, ssl_capath);
315
316 if(ret<0) {
317 #ifdef MBEDTLS_ERROR_C
318 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
319 #endif /* MBEDTLS_ERROR_C */
320 failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
321 ssl_capath, -ret, errorbuf);
322
323 if(verifypeer)
324 return CURLE_SSL_CACERT_BADFILE;
325 }
326 }
327
328 /* Load the client certificate */
329 mbedtls_x509_crt_init(&backend->clicert);
330
331 if(ssl_cert) {
332 ret = mbedtls_x509_crt_parse_file(&backend->clicert, ssl_cert);
333
334 if(ret) {
335 #ifdef MBEDTLS_ERROR_C
336 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
337 #endif /* MBEDTLS_ERROR_C */
338 failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
339 ssl_cert, -ret, errorbuf);
340
341 return CURLE_SSL_CERTPROBLEM;
342 }
343 }
344
345 /* Load the client private key */
346 mbedtls_pk_init(&backend->pk);
347
348 if(SSL_SET_OPTION(key)) {
349 ret = mbedtls_pk_parse_keyfile(&backend->pk, SSL_SET_OPTION(key),
350 SSL_SET_OPTION(key_passwd));
351 if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) ||
352 mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_ECKEY)))
353 ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
354
355 if(ret) {
356 #ifdef MBEDTLS_ERROR_C
357 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
358 #endif /* MBEDTLS_ERROR_C */
359 failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
360 SSL_SET_OPTION(key), -ret, errorbuf);
361
362 return CURLE_SSL_CERTPROBLEM;
363 }
364 }
365
366 /* Load the CRL */
367 mbedtls_x509_crl_init(&backend->crl);
368
369 if(ssl_crlfile) {
370 ret = mbedtls_x509_crl_parse_file(&backend->crl, ssl_crlfile);
371
372 if(ret) {
373 #ifdef MBEDTLS_ERROR_C
374 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
375 #endif /* MBEDTLS_ERROR_C */
376 failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
377 ssl_crlfile, -ret, errorbuf);
378
379 return CURLE_SSL_CRL_BADFILE;
380 }
381 }
382
383 infof(data, "mbedTLS: Connecting to %s:%ld\n", hostname, port);
384
385 mbedtls_ssl_config_init(&backend->config);
386
387 mbedtls_ssl_init(&backend->ssl);
388 if(mbedtls_ssl_setup(&backend->ssl, &backend->config)) {
389 failf(data, "mbedTLS: ssl_init failed");
390 return CURLE_SSL_CONNECT_ERROR;
391 }
392 ret = mbedtls_ssl_config_defaults(&backend->config,
393 MBEDTLS_SSL_IS_CLIENT,
394 MBEDTLS_SSL_TRANSPORT_STREAM,
395 MBEDTLS_SSL_PRESET_DEFAULT);
396 if(ret) {
397 failf(data, "mbedTLS: ssl_config failed");
398 return CURLE_SSL_CONNECT_ERROR;
399 }
400
401 /* new profile with RSA min key len = 1024 ... */
402 mbedtls_ssl_conf_cert_profile(&backend->config,
403 &mbedtls_x509_crt_profile_fr);
404
405 switch(SSL_CONN_CONFIG(version)) {
406 case CURL_SSLVERSION_DEFAULT:
407 case CURL_SSLVERSION_TLSv1:
408 mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
409 MBEDTLS_SSL_MINOR_VERSION_1);
410 infof(data, "mbedTLS: Set min SSL version to TLS 1.0\n");
411 break;
412 case CURL_SSLVERSION_SSLv3:
413 mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
414 MBEDTLS_SSL_MINOR_VERSION_0);
415 mbedtls_ssl_conf_max_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
416 MBEDTLS_SSL_MINOR_VERSION_0);
417 infof(data, "mbedTLS: Set SSL version to SSLv3\n");
418 break;
419 case CURL_SSLVERSION_TLSv1_0:
420 case CURL_SSLVERSION_TLSv1_1:
421 case CURL_SSLVERSION_TLSv1_2:
422 case CURL_SSLVERSION_TLSv1_3:
423 {
424 CURLcode result = set_ssl_version_min_max(conn, sockindex);
425 if(result != CURLE_OK)
426 return result;
427 break;
428 }
429 default:
430 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
431 return CURLE_SSL_CONNECT_ERROR;
432 }
433
434 mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
435
436 mbedtls_ssl_conf_rng(&backend->config, mbedtls_ctr_drbg_random,
437 &backend->ctr_drbg);
438 mbedtls_ssl_set_bio(&backend->ssl, &conn->sock[sockindex],
439 mbedtls_net_send,
440 mbedtls_net_recv,
441 NULL /* rev_timeout() */);
442
443 mbedtls_ssl_conf_ciphersuites(&backend->config,
444 mbedtls_ssl_list_ciphersuites());
445
446 #if defined(MBEDTLS_SSL_RENEGOTIATION)
447 mbedtls_ssl_conf_renegotiation(&backend->config,
448 MBEDTLS_SSL_RENEGOTIATION_ENABLED);
449 #endif
450
451 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
452 mbedtls_ssl_conf_session_tickets(&backend->config,
453 MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
454 #endif
455
456 /* Check if there's a cached ID we can/should use here! */
457 if(SSL_SET_OPTION(primary.sessionid)) {
458 void *old_session = NULL;
459
460 Curl_ssl_sessionid_lock(conn);
461 if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
462 ret = mbedtls_ssl_set_session(&backend->ssl, old_session);
463 if(ret) {
464 Curl_ssl_sessionid_unlock(conn);
465 failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
466 return CURLE_SSL_CONNECT_ERROR;
467 }
468 infof(data, "mbedTLS re-using session\n");
469 }
470 Curl_ssl_sessionid_unlock(conn);
471 }
472
473 mbedtls_ssl_conf_ca_chain(&backend->config,
474 &backend->cacert,
475 &backend->crl);
476
477 if(SSL_SET_OPTION(key)) {
478 mbedtls_ssl_conf_own_cert(&backend->config,
479 &backend->clicert, &backend->pk);
480 }
481 if(mbedtls_ssl_set_hostname(&backend->ssl, hostname)) {
482 /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks *and*
483 the name to set in the SNI extension. So even if curl connects to a
484 host specified as an IP address, this function must be used. */
485 failf(data, "couldn't set hostname in mbedTLS");
486 return CURLE_SSL_CONNECT_ERROR;
487 }
488
489 #ifdef HAS_ALPN
490 if(conn->bits.tls_enable_alpn) {
491 const char **p = &backend->protocols[0];
492 #ifdef USE_NGHTTP2
493 if(data->set.httpversion >= CURL_HTTP_VERSION_2)
494 *p++ = NGHTTP2_PROTO_VERSION_ID;
495 #endif
496 *p++ = ALPN_HTTP_1_1;
497 *p = NULL;
498 /* this function doesn't clone the protocols array, which is why we need
499 to keep it around */
500 if(mbedtls_ssl_conf_alpn_protocols(&backend->config,
501 &backend->protocols[0])) {
502 failf(data, "Failed setting ALPN protocols");
503 return CURLE_SSL_CONNECT_ERROR;
504 }
505 for(p = &backend->protocols[0]; *p; ++p)
506 infof(data, "ALPN, offering %s\n", *p);
507 }
508 #endif
509
510 #ifdef MBEDTLS_DEBUG
511 /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
512 mbedtls_ssl_conf_dbg(&backend->config, mbed_debug, data);
513 /* - 0 No debug
514 * - 1 Error
515 * - 2 State change
516 * - 3 Informational
517 * - 4 Verbose
518 */
519 mbedtls_debug_set_threshold(4);
520 #endif
521
522 /* give application a chance to interfere with mbedTLS set up. */
523 if(data->set.ssl.fsslctx) {
524 ret = (*data->set.ssl.fsslctx)(data, &backend->config,
525 data->set.ssl.fsslctxp);
526 if(ret) {
527 failf(data, "error signaled by ssl ctx callback");
528 return ret;
529 }
530 }
531
532 connssl->connecting_state = ssl_connect_2;
533
534 return CURLE_OK;
535 }
536
537 static CURLcode
mbed_connect_step2(struct connectdata * conn,int sockindex)538 mbed_connect_step2(struct connectdata *conn,
539 int sockindex)
540 {
541 int ret;
542 struct Curl_easy *data = conn->data;
543 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
544 struct ssl_backend_data *backend = connssl->backend;
545 const mbedtls_x509_crt *peercert;
546 #ifndef CURL_DISABLE_PROXY
547 const char * const pinnedpubkey = SSL_IS_PROXY() ?
548 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
549 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
550 #else
551 const char * const pinnedpubkey =
552 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
553 #endif
554
555 conn->recv[sockindex] = mbed_recv;
556 conn->send[sockindex] = mbed_send;
557
558 ret = mbedtls_ssl_handshake(&backend->ssl);
559
560 if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
561 connssl->connecting_state = ssl_connect_2_reading;
562 return CURLE_OK;
563 }
564 else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
565 connssl->connecting_state = ssl_connect_2_writing;
566 return CURLE_OK;
567 }
568 else if(ret) {
569 char errorbuf[128];
570 errorbuf[0] = 0;
571 #ifdef MBEDTLS_ERROR_C
572 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
573 #endif /* MBEDTLS_ERROR_C */
574 failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
575 -ret, errorbuf);
576 return CURLE_SSL_CONNECT_ERROR;
577 }
578
579 infof(data, "mbedTLS: Handshake complete, cipher is %s\n",
580 mbedtls_ssl_get_ciphersuite(&backend->ssl)
581 );
582
583 ret = mbedtls_ssl_get_verify_result(&backend->ssl);
584
585 if(!SSL_CONN_CONFIG(verifyhost))
586 /* Ignore hostname errors if verifyhost is disabled */
587 ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH;
588
589 if(ret && SSL_CONN_CONFIG(verifypeer)) {
590 if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
591 failf(data, "Cert verify failed: BADCERT_EXPIRED");
592
593 else if(ret & MBEDTLS_X509_BADCERT_REVOKED)
594 failf(data, "Cert verify failed: BADCERT_REVOKED");
595
596 else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
597 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
598
599 else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
600 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
601
602 else if(ret & MBEDTLS_X509_BADCERT_FUTURE)
603 failf(data, "Cert verify failed: BADCERT_FUTURE");
604
605 return CURLE_PEER_FAILED_VERIFICATION;
606 }
607
608 peercert = mbedtls_ssl_get_peer_cert(&backend->ssl);
609
610 if(peercert && data->set.verbose) {
611 const size_t bufsize = 16384;
612 char *buffer = malloc(bufsize);
613
614 if(!buffer)
615 return CURLE_OUT_OF_MEMORY;
616
617 if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0)
618 infof(data, "Dumping cert info:\n%s\n", buffer);
619 else
620 infof(data, "Unable to dump certificate information.\n");
621
622 free(buffer);
623 }
624
625 if(pinnedpubkey) {
626 int size;
627 CURLcode result;
628 mbedtls_x509_crt *p;
629 unsigned char pubkey[PUB_DER_MAX_BYTES];
630
631 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
632 failf(data, "Failed due to missing peer certificate");
633 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
634 }
635
636 p = calloc(1, sizeof(*p));
637
638 if(!p)
639 return CURLE_OUT_OF_MEMORY;
640
641 mbedtls_x509_crt_init(p);
642
643 /* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der
644 needs a non-const key, for now.
645 https://github.com/ARMmbed/mbedtls/issues/396 */
646 if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
647 failf(data, "Failed copying peer certificate");
648 mbedtls_x509_crt_free(p);
649 free(p);
650 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
651 }
652
653 size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
654
655 if(size <= 0) {
656 failf(data, "Failed copying public key from peer certificate");
657 mbedtls_x509_crt_free(p);
658 free(p);
659 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
660 }
661
662 /* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */
663 result = Curl_pin_peer_pubkey(data,
664 pinnedpubkey,
665 &pubkey[PUB_DER_MAX_BYTES - size], size);
666 if(result) {
667 mbedtls_x509_crt_free(p);
668 free(p);
669 return result;
670 }
671
672 mbedtls_x509_crt_free(p);
673 free(p);
674 }
675
676 #ifdef HAS_ALPN
677 if(conn->bits.tls_enable_alpn) {
678 const char *next_protocol = mbedtls_ssl_get_alpn_protocol(&backend->ssl);
679
680 if(next_protocol) {
681 infof(data, "ALPN, server accepted to use %s\n", next_protocol);
682 #ifdef USE_NGHTTP2
683 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
684 NGHTTP2_PROTO_VERSION_ID_LEN) &&
685 !next_protocol[NGHTTP2_PROTO_VERSION_ID_LEN]) {
686 conn->negnpn = CURL_HTTP_VERSION_2;
687 }
688 else
689 #endif
690 if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH) &&
691 !next_protocol[ALPN_HTTP_1_1_LENGTH]) {
692 conn->negnpn = CURL_HTTP_VERSION_1_1;
693 }
694 }
695 else {
696 infof(data, "ALPN, server did not agree to a protocol\n");
697 }
698 Curl_multiuse_state(conn, conn->negnpn == CURL_HTTP_VERSION_2 ?
699 BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
700 }
701 #endif
702
703 connssl->connecting_state = ssl_connect_3;
704 infof(data, "SSL connected\n");
705
706 return CURLE_OK;
707 }
708
709 static CURLcode
mbed_connect_step3(struct connectdata * conn,int sockindex)710 mbed_connect_step3(struct connectdata *conn,
711 int sockindex)
712 {
713 CURLcode retcode = CURLE_OK;
714 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
715 struct ssl_backend_data *backend = connssl->backend;
716 struct Curl_easy *data = conn->data;
717
718 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
719
720 if(SSL_SET_OPTION(primary.sessionid)) {
721 int ret;
722 mbedtls_ssl_session *our_ssl_sessionid;
723 void *old_ssl_sessionid = NULL;
724
725 our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
726 if(!our_ssl_sessionid)
727 return CURLE_OUT_OF_MEMORY;
728
729 mbedtls_ssl_session_init(our_ssl_sessionid);
730
731 ret = mbedtls_ssl_get_session(&backend->ssl, our_ssl_sessionid);
732 if(ret) {
733 if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
734 mbedtls_ssl_session_free(our_ssl_sessionid);
735 free(our_ssl_sessionid);
736 failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
737 return CURLE_SSL_CONNECT_ERROR;
738 }
739
740 /* If there's already a matching session in the cache, delete it */
741 Curl_ssl_sessionid_lock(conn);
742 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
743 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
744
745 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
746 Curl_ssl_sessionid_unlock(conn);
747 if(retcode) {
748 mbedtls_ssl_session_free(our_ssl_sessionid);
749 free(our_ssl_sessionid);
750 failf(data, "failed to store ssl session");
751 return retcode;
752 }
753 }
754
755 connssl->connecting_state = ssl_connect_done;
756
757 return CURLE_OK;
758 }
759
mbed_send(struct connectdata * conn,int sockindex,const void * mem,size_t len,CURLcode * curlcode)760 static ssize_t mbed_send(struct connectdata *conn, int sockindex,
761 const void *mem, size_t len,
762 CURLcode *curlcode)
763 {
764 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
765 struct ssl_backend_data *backend = connssl->backend;
766 int ret = -1;
767
768 ret = mbedtls_ssl_write(&backend->ssl,
769 (unsigned char *)mem, len);
770
771 if(ret < 0) {
772 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
773 CURLE_AGAIN : CURLE_SEND_ERROR;
774 ret = -1;
775 }
776
777 return ret;
778 }
779
Curl_mbedtls_close_all(struct Curl_easy * data)780 static void Curl_mbedtls_close_all(struct Curl_easy *data)
781 {
782 (void)data;
783 }
784
Curl_mbedtls_close(struct connectdata * conn,int sockindex)785 static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
786 {
787 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
788 struct ssl_backend_data *backend = connssl->backend;
789 mbedtls_pk_free(&backend->pk);
790 mbedtls_x509_crt_free(&backend->clicert);
791 mbedtls_x509_crt_free(&backend->cacert);
792 mbedtls_x509_crl_free(&backend->crl);
793 mbedtls_ssl_config_free(&backend->config);
794 mbedtls_ssl_free(&backend->ssl);
795 mbedtls_ctr_drbg_free(&backend->ctr_drbg);
796 #ifndef THREADING_SUPPORT
797 mbedtls_entropy_free(&backend->entropy);
798 #endif /* THREADING_SUPPORT */
799 }
800
mbed_recv(struct connectdata * conn,int num,char * buf,size_t buffersize,CURLcode * curlcode)801 static ssize_t mbed_recv(struct connectdata *conn, int num,
802 char *buf, size_t buffersize,
803 CURLcode *curlcode)
804 {
805 struct ssl_connect_data *connssl = &conn->ssl[num];
806 struct ssl_backend_data *backend = connssl->backend;
807 int ret = -1;
808 ssize_t len = -1;
809
810 memset(buf, 0, buffersize);
811 ret = mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf,
812 buffersize);
813
814 if(ret <= 0) {
815 if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
816 return 0;
817
818 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
819 CURLE_AGAIN : CURLE_RECV_ERROR;
820 return -1;
821 }
822
823 len = ret;
824
825 return len;
826 }
827
Curl_mbedtls_session_free(void * ptr)828 static void Curl_mbedtls_session_free(void *ptr)
829 {
830 mbedtls_ssl_session_free(ptr);
831 free(ptr);
832 }
833
Curl_mbedtls_version(char * buffer,size_t size)834 static size_t Curl_mbedtls_version(char *buffer, size_t size)
835 {
836 #ifdef MBEDTLS_VERSION_C
837 /* if mbedtls_version_get_number() is available it is better */
838 unsigned int version = mbedtls_version_get_number();
839 return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
840 (version>>16)&0xff, (version>>8)&0xff);
841 #else
842 return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
843 #endif
844 }
845
Curl_mbedtls_random(struct Curl_easy * data,unsigned char * entropy,size_t length)846 static CURLcode Curl_mbedtls_random(struct Curl_easy *data,
847 unsigned char *entropy, size_t length)
848 {
849 #if defined(MBEDTLS_CTR_DRBG_C)
850 int ret = -1;
851 char errorbuf[128];
852 mbedtls_entropy_context ctr_entropy;
853 mbedtls_ctr_drbg_context ctr_drbg;
854 mbedtls_entropy_init(&ctr_entropy);
855 mbedtls_ctr_drbg_init(&ctr_drbg);
856 errorbuf[0] = 0;
857
858 ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
859 &ctr_entropy, NULL, 0);
860
861 if(ret) {
862 #ifdef MBEDTLS_ERROR_C
863 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
864 #endif /* MBEDTLS_ERROR_C */
865 failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
866 -ret, errorbuf);
867 }
868 else {
869 ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
870
871 if(ret) {
872 #ifdef MBEDTLS_ERROR_C
873 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
874 #endif /* MBEDTLS_ERROR_C */
875 failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
876 -ret, errorbuf);
877 }
878 }
879
880 mbedtls_ctr_drbg_free(&ctr_drbg);
881 mbedtls_entropy_free(&ctr_entropy);
882
883 return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
884 #elif defined(MBEDTLS_HAVEGE_C)
885 mbedtls_havege_state hs;
886 mbedtls_havege_init(&hs);
887 mbedtls_havege_random(&hs, entropy, length);
888 mbedtls_havege_free(&hs);
889 return CURLE_OK;
890 #else
891 return CURLE_NOT_BUILT_IN;
892 #endif
893 }
894
895 static CURLcode
mbed_connect_common(struct connectdata * conn,int sockindex,bool nonblocking,bool * done)896 mbed_connect_common(struct connectdata *conn,
897 int sockindex,
898 bool nonblocking,
899 bool *done)
900 {
901 CURLcode retcode;
902 struct Curl_easy *data = conn->data;
903 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
904 curl_socket_t sockfd = conn->sock[sockindex];
905 timediff_t timeout_ms;
906 int what;
907
908 /* check if the connection has already been established */
909 if(ssl_connection_complete == connssl->state) {
910 *done = TRUE;
911 return CURLE_OK;
912 }
913
914 if(ssl_connect_1 == connssl->connecting_state) {
915 /* Find out how much more time we're allowed */
916 timeout_ms = Curl_timeleft(data, NULL, TRUE);
917
918 if(timeout_ms < 0) {
919 /* no need to continue if time already is up */
920 failf(data, "SSL connection timeout");
921 return CURLE_OPERATION_TIMEDOUT;
922 }
923 retcode = mbed_connect_step1(conn, sockindex);
924 if(retcode)
925 return retcode;
926 }
927
928 while(ssl_connect_2 == connssl->connecting_state ||
929 ssl_connect_2_reading == connssl->connecting_state ||
930 ssl_connect_2_writing == connssl->connecting_state) {
931
932 /* check allowed time left */
933 timeout_ms = Curl_timeleft(data, NULL, TRUE);
934
935 if(timeout_ms < 0) {
936 /* no need to continue if time already is up */
937 failf(data, "SSL connection timeout");
938 return CURLE_OPERATION_TIMEDOUT;
939 }
940
941 /* if ssl is expecting something, check if it's available. */
942 if(connssl->connecting_state == ssl_connect_2_reading
943 || connssl->connecting_state == ssl_connect_2_writing) {
944
945 curl_socket_t writefd = ssl_connect_2_writing ==
946 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
947 curl_socket_t readfd = ssl_connect_2_reading ==
948 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
949
950 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
951 nonblocking ? 0 : timeout_ms);
952 if(what < 0) {
953 /* fatal error */
954 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
955 return CURLE_SSL_CONNECT_ERROR;
956 }
957 else if(0 == what) {
958 if(nonblocking) {
959 *done = FALSE;
960 return CURLE_OK;
961 }
962 else {
963 /* timeout */
964 failf(data, "SSL connection timeout");
965 return CURLE_OPERATION_TIMEDOUT;
966 }
967 }
968 /* socket is readable or writable */
969 }
970
971 /* Run transaction, and return to the caller if it failed or if
972 * this connection is part of a multi handle and this loop would
973 * execute again. This permits the owner of a multi handle to
974 * abort a connection attempt before step2 has completed while
975 * ensuring that a client using select() or epoll() will always
976 * have a valid fdset to wait on.
977 */
978 retcode = mbed_connect_step2(conn, sockindex);
979 if(retcode || (nonblocking &&
980 (ssl_connect_2 == connssl->connecting_state ||
981 ssl_connect_2_reading == connssl->connecting_state ||
982 ssl_connect_2_writing == connssl->connecting_state)))
983 return retcode;
984
985 } /* repeat step2 until all transactions are done. */
986
987 if(ssl_connect_3 == connssl->connecting_state) {
988 retcode = mbed_connect_step3(conn, sockindex);
989 if(retcode)
990 return retcode;
991 }
992
993 if(ssl_connect_done == connssl->connecting_state) {
994 connssl->state = ssl_connection_complete;
995 conn->recv[sockindex] = mbed_recv;
996 conn->send[sockindex] = mbed_send;
997 *done = TRUE;
998 }
999 else
1000 *done = FALSE;
1001
1002 /* Reset our connect state machine */
1003 connssl->connecting_state = ssl_connect_1;
1004
1005 return CURLE_OK;
1006 }
1007
Curl_mbedtls_connect_nonblocking(struct connectdata * conn,int sockindex,bool * done)1008 static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
1009 int sockindex, bool *done)
1010 {
1011 return mbed_connect_common(conn, sockindex, TRUE, done);
1012 }
1013
1014
Curl_mbedtls_connect(struct connectdata * conn,int sockindex)1015 static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
1016 {
1017 CURLcode retcode;
1018 bool done = FALSE;
1019
1020 retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
1021 if(retcode)
1022 return retcode;
1023
1024 DEBUGASSERT(done);
1025
1026 return CURLE_OK;
1027 }
1028
1029 /*
1030 * return 0 error initializing SSL
1031 * return 1 SSL initialized successfully
1032 */
Curl_mbedtls_init(void)1033 static int Curl_mbedtls_init(void)
1034 {
1035 return Curl_mbedtlsthreadlock_thread_setup();
1036 }
1037
Curl_mbedtls_cleanup(void)1038 static void Curl_mbedtls_cleanup(void)
1039 {
1040 (void)Curl_mbedtlsthreadlock_thread_cleanup();
1041 }
1042
Curl_mbedtls_data_pending(const struct connectdata * conn,int sockindex)1043 static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
1044 int sockindex)
1045 {
1046 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1047 struct ssl_backend_data *backend = connssl->backend;
1048 return mbedtls_ssl_get_bytes_avail(&backend->ssl) != 0;
1049 }
1050
Curl_mbedtls_sha256sum(const unsigned char * input,size_t inputlen,unsigned char * sha256sum,size_t sha256len UNUSED_PARAM)1051 static CURLcode Curl_mbedtls_sha256sum(const unsigned char *input,
1052 size_t inputlen,
1053 unsigned char *sha256sum,
1054 size_t sha256len UNUSED_PARAM)
1055 {
1056 (void)sha256len;
1057 #if MBEDTLS_VERSION_NUMBER < 0x02070000
1058 mbedtls_sha256(input, inputlen, sha256sum, 0);
1059 #else
1060 /* returns 0 on success, otherwise failure */
1061 if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
1062 return CURLE_BAD_FUNCTION_ARGUMENT;
1063 #endif
1064 return CURLE_OK;
1065 }
1066
Curl_mbedtls_get_internals(struct ssl_connect_data * connssl,CURLINFO info UNUSED_PARAM)1067 static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
1068 CURLINFO info UNUSED_PARAM)
1069 {
1070 struct ssl_backend_data *backend = connssl->backend;
1071 (void)info;
1072 return &backend->ssl;
1073 }
1074
1075 const struct Curl_ssl Curl_ssl_mbedtls = {
1076 { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1077
1078 SSLSUPP_CA_PATH |
1079 SSLSUPP_PINNEDPUBKEY |
1080 SSLSUPP_SSL_CTX,
1081
1082 sizeof(struct ssl_backend_data),
1083
1084 Curl_mbedtls_init, /* init */
1085 Curl_mbedtls_cleanup, /* cleanup */
1086 Curl_mbedtls_version, /* version */
1087 Curl_none_check_cxn, /* check_cxn */
1088 Curl_none_shutdown, /* shutdown */
1089 Curl_mbedtls_data_pending, /* data_pending */
1090 Curl_mbedtls_random, /* random */
1091 Curl_none_cert_status_request, /* cert_status_request */
1092 Curl_mbedtls_connect, /* connect */
1093 Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
1094 Curl_mbedtls_get_internals, /* get_internals */
1095 Curl_mbedtls_close, /* close_one */
1096 Curl_mbedtls_close_all, /* close_all */
1097 Curl_mbedtls_session_free, /* session_free */
1098 Curl_none_set_engine, /* set_engine */
1099 Curl_none_set_engine_default, /* set_engine_default */
1100 Curl_none_engines_list, /* engines_list */
1101 Curl_none_false_start, /* false_start */
1102 Curl_none_md5sum, /* md5sum */
1103 Curl_mbedtls_sha256sum /* sha256sum */
1104 };
1105
1106 #endif /* USE_MBEDTLS */
1107