1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
9 * Copyright (C) 2012 - 2019, 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
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() */
entropy_init_mutex(mbedtls_entropy_context * ctx)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() */
entropy_func_mutex(void * data,unsigned char * output,size_t len)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
mbed_debug(void * context,int level,const char * f_name,int line_nb,const char * line)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
mbedtls_version_from_curl(int * mbedver,long version)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
set_ssl_version_min_max(struct connectdata * conn,int sockindex)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
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 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
mbed_connect_step2(struct connectdata * conn,int sockindex)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
mbed_connect_step3(struct connectdata * conn,int sockindex)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 if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
720 mbedtls_ssl_session_free(our_ssl_sessionid);
721 free(our_ssl_sessionid);
722 failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
723 return CURLE_SSL_CONNECT_ERROR;
724 }
725
726 /* If there's already a matching session in the cache, delete it */
727 Curl_ssl_sessionid_lock(conn);
728 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
729 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
730
731 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
732 Curl_ssl_sessionid_unlock(conn);
733 if(retcode) {
734 mbedtls_ssl_session_free(our_ssl_sessionid);
735 free(our_ssl_sessionid);
736 failf(data, "failed to store ssl session");
737 return retcode;
738 }
739 }
740
741 connssl->connecting_state = ssl_connect_done;
742
743 return CURLE_OK;
744 }
745
mbed_send(struct connectdata * conn,int sockindex,const void * mem,size_t len,CURLcode * curlcode)746 static ssize_t mbed_send(struct connectdata *conn, int sockindex,
747 const void *mem, size_t len,
748 CURLcode *curlcode)
749 {
750 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
751 int ret = -1;
752
753 ret = mbedtls_ssl_write(&BACKEND->ssl,
754 (unsigned char *)mem, len);
755
756 if(ret < 0) {
757 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
758 CURLE_AGAIN : CURLE_SEND_ERROR;
759 ret = -1;
760 }
761
762 return ret;
763 }
764
Curl_mbedtls_close_all(struct Curl_easy * data)765 static void Curl_mbedtls_close_all(struct Curl_easy *data)
766 {
767 (void)data;
768 }
769
Curl_mbedtls_close(struct connectdata * conn,int sockindex)770 static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
771 {
772 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
773 mbedtls_pk_free(&BACKEND->pk);
774 mbedtls_x509_crt_free(&BACKEND->clicert);
775 mbedtls_x509_crt_free(&BACKEND->cacert);
776 mbedtls_x509_crl_free(&BACKEND->crl);
777 mbedtls_ssl_config_free(&BACKEND->config);
778 mbedtls_ssl_free(&BACKEND->ssl);
779 mbedtls_ctr_drbg_free(&BACKEND->ctr_drbg);
780 #ifndef THREADING_SUPPORT
781 mbedtls_entropy_free(&BACKEND->entropy);
782 #endif /* THREADING_SUPPORT */
783 }
784
mbed_recv(struct connectdata * conn,int num,char * buf,size_t buffersize,CURLcode * curlcode)785 static ssize_t mbed_recv(struct connectdata *conn, int num,
786 char *buf, size_t buffersize,
787 CURLcode *curlcode)
788 {
789 struct ssl_connect_data *connssl = &conn->ssl[num];
790 int ret = -1;
791 ssize_t len = -1;
792
793 memset(buf, 0, buffersize);
794 ret = mbedtls_ssl_read(&BACKEND->ssl, (unsigned char *)buf,
795 buffersize);
796
797 if(ret <= 0) {
798 if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
799 return 0;
800
801 *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
802 CURLE_AGAIN : CURLE_RECV_ERROR;
803 return -1;
804 }
805
806 len = ret;
807
808 return len;
809 }
810
Curl_mbedtls_session_free(void * ptr)811 static void Curl_mbedtls_session_free(void *ptr)
812 {
813 mbedtls_ssl_session_free(ptr);
814 free(ptr);
815 }
816
Curl_mbedtls_version(char * buffer,size_t size)817 static size_t Curl_mbedtls_version(char *buffer, size_t size)
818 {
819 #ifdef MBEDTLS_VERSION_C
820 /* if mbedtls_version_get_number() is available it is better */
821 unsigned int version = mbedtls_version_get_number();
822 return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
823 (version>>16)&0xff, (version>>8)&0xff);
824 #else
825 return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
826 #endif
827 }
828
Curl_mbedtls_random(struct Curl_easy * data,unsigned char * entropy,size_t length)829 static CURLcode Curl_mbedtls_random(struct Curl_easy *data,
830 unsigned char *entropy, size_t length)
831 {
832 #if defined(MBEDTLS_CTR_DRBG_C)
833 int ret = -1;
834 char errorbuf[128];
835 mbedtls_entropy_context ctr_entropy;
836 mbedtls_ctr_drbg_context ctr_drbg;
837 mbedtls_entropy_init(&ctr_entropy);
838 mbedtls_ctr_drbg_init(&ctr_drbg);
839 errorbuf[0] = 0;
840
841 ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
842 &ctr_entropy, NULL, 0);
843
844 if(ret) {
845 #ifdef MBEDTLS_ERROR_C
846 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
847 #endif /* MBEDTLS_ERROR_C */
848 failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
849 -ret, errorbuf);
850 }
851 else {
852 ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
853
854 if(ret) {
855 #ifdef MBEDTLS_ERROR_C
856 mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
857 #endif /* MBEDTLS_ERROR_C */
858 failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
859 -ret, errorbuf);
860 }
861 }
862
863 mbedtls_ctr_drbg_free(&ctr_drbg);
864 mbedtls_entropy_free(&ctr_entropy);
865
866 return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
867 #elif defined(MBEDTLS_HAVEGE_C)
868 mbedtls_havege_state hs;
869 mbedtls_havege_init(&hs);
870 mbedtls_havege_random(&hs, entropy, length);
871 mbedtls_havege_free(&hs);
872 return CURLE_OK;
873 #else
874 return CURLE_NOT_BUILT_IN;
875 #endif
876 }
877
878 static CURLcode
mbed_connect_common(struct connectdata * conn,int sockindex,bool nonblocking,bool * done)879 mbed_connect_common(struct connectdata *conn,
880 int sockindex,
881 bool nonblocking,
882 bool *done)
883 {
884 CURLcode retcode;
885 struct Curl_easy *data = conn->data;
886 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
887 curl_socket_t sockfd = conn->sock[sockindex];
888 long timeout_ms;
889 int what;
890
891 /* check if the connection has already been established */
892 if(ssl_connection_complete == connssl->state) {
893 *done = TRUE;
894 return CURLE_OK;
895 }
896
897 if(ssl_connect_1 == connssl->connecting_state) {
898 /* Find out how much more time we're allowed */
899 timeout_ms = Curl_timeleft(data, NULL, TRUE);
900
901 if(timeout_ms < 0) {
902 /* no need to continue if time already is up */
903 failf(data, "SSL connection timeout");
904 return CURLE_OPERATION_TIMEDOUT;
905 }
906 retcode = mbed_connect_step1(conn, sockindex);
907 if(retcode)
908 return retcode;
909 }
910
911 while(ssl_connect_2 == connssl->connecting_state ||
912 ssl_connect_2_reading == connssl->connecting_state ||
913 ssl_connect_2_writing == connssl->connecting_state) {
914
915 /* check allowed time left */
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
924 /* if ssl is expecting something, check if it's available. */
925 if(connssl->connecting_state == ssl_connect_2_reading
926 || connssl->connecting_state == ssl_connect_2_writing) {
927
928 curl_socket_t writefd = ssl_connect_2_writing ==
929 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
930 curl_socket_t readfd = ssl_connect_2_reading ==
931 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
932
933 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
934 nonblocking ? 0 : timeout_ms);
935 if(what < 0) {
936 /* fatal error */
937 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
938 return CURLE_SSL_CONNECT_ERROR;
939 }
940 else if(0 == what) {
941 if(nonblocking) {
942 *done = FALSE;
943 return CURLE_OK;
944 }
945 else {
946 /* timeout */
947 failf(data, "SSL connection timeout");
948 return CURLE_OPERATION_TIMEDOUT;
949 }
950 }
951 /* socket is readable or writable */
952 }
953
954 /* Run transaction, and return to the caller if it failed or if
955 * this connection is part of a multi handle and this loop would
956 * execute again. This permits the owner of a multi handle to
957 * abort a connection attempt before step2 has completed while
958 * ensuring that a client using select() or epoll() will always
959 * have a valid fdset to wait on.
960 */
961 retcode = mbed_connect_step2(conn, sockindex);
962 if(retcode || (nonblocking &&
963 (ssl_connect_2 == connssl->connecting_state ||
964 ssl_connect_2_reading == connssl->connecting_state ||
965 ssl_connect_2_writing == connssl->connecting_state)))
966 return retcode;
967
968 } /* repeat step2 until all transactions are done. */
969
970 if(ssl_connect_3 == connssl->connecting_state) {
971 retcode = mbed_connect_step3(conn, sockindex);
972 if(retcode)
973 return retcode;
974 }
975
976 if(ssl_connect_done == connssl->connecting_state) {
977 connssl->state = ssl_connection_complete;
978 conn->recv[sockindex] = mbed_recv;
979 conn->send[sockindex] = mbed_send;
980 *done = TRUE;
981 }
982 else
983 *done = FALSE;
984
985 /* Reset our connect state machine */
986 connssl->connecting_state = ssl_connect_1;
987
988 return CURLE_OK;
989 }
990
Curl_mbedtls_connect_nonblocking(struct connectdata * conn,int sockindex,bool * done)991 static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
992 int sockindex, bool *done)
993 {
994 return mbed_connect_common(conn, sockindex, TRUE, done);
995 }
996
997
Curl_mbedtls_connect(struct connectdata * conn,int sockindex)998 static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
999 {
1000 CURLcode retcode;
1001 bool done = FALSE;
1002
1003 retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
1004 if(retcode)
1005 return retcode;
1006
1007 DEBUGASSERT(done);
1008
1009 return CURLE_OK;
1010 }
1011
1012 /*
1013 * return 0 error initializing SSL
1014 * return 1 SSL initialized successfully
1015 */
Curl_mbedtls_init(void)1016 static int Curl_mbedtls_init(void)
1017 {
1018 return Curl_polarsslthreadlock_thread_setup();
1019 }
1020
Curl_mbedtls_cleanup(void)1021 static void Curl_mbedtls_cleanup(void)
1022 {
1023 (void)Curl_polarsslthreadlock_thread_cleanup();
1024 }
1025
Curl_mbedtls_data_pending(const struct connectdata * conn,int sockindex)1026 static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
1027 int sockindex)
1028 {
1029 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1030 return mbedtls_ssl_get_bytes_avail(&BACKEND->ssl) != 0;
1031 }
1032
Curl_mbedtls_sha256sum(const unsigned char * input,size_t inputlen,unsigned char * sha256sum,size_t sha256len UNUSED_PARAM)1033 static CURLcode Curl_mbedtls_sha256sum(const unsigned char *input,
1034 size_t inputlen,
1035 unsigned char *sha256sum,
1036 size_t sha256len UNUSED_PARAM)
1037 {
1038 (void)sha256len;
1039 #if MBEDTLS_VERSION_NUMBER < 0x02070000
1040 mbedtls_sha256(input, inputlen, sha256sum, 0);
1041 #else
1042 /* returns 0 on success, otherwise failure */
1043 if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
1044 return CURLE_BAD_FUNCTION_ARGUMENT;
1045 #endif
1046 return CURLE_OK;
1047 }
1048
Curl_mbedtls_get_internals(struct ssl_connect_data * connssl,CURLINFO info UNUSED_PARAM)1049 static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
1050 CURLINFO info UNUSED_PARAM)
1051 {
1052 (void)info;
1053 return &BACKEND->ssl;
1054 }
1055
1056 const struct Curl_ssl Curl_ssl_mbedtls = {
1057 { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1058
1059 SSLSUPP_CA_PATH |
1060 SSLSUPP_PINNEDPUBKEY |
1061 SSLSUPP_SSL_CTX,
1062
1063 sizeof(struct ssl_backend_data),
1064
1065 Curl_mbedtls_init, /* init */
1066 Curl_mbedtls_cleanup, /* cleanup */
1067 Curl_mbedtls_version, /* version */
1068 Curl_none_check_cxn, /* check_cxn */
1069 Curl_none_shutdown, /* shutdown */
1070 Curl_mbedtls_data_pending, /* data_pending */
1071 Curl_mbedtls_random, /* random */
1072 Curl_none_cert_status_request, /* cert_status_request */
1073 Curl_mbedtls_connect, /* connect */
1074 Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
1075 Curl_mbedtls_get_internals, /* get_internals */
1076 Curl_mbedtls_close, /* close_one */
1077 Curl_mbedtls_close_all, /* close_all */
1078 Curl_mbedtls_session_free, /* session_free */
1079 Curl_none_set_engine, /* set_engine */
1080 Curl_none_set_engine_default, /* set_engine_default */
1081 Curl_none_engines_list, /* engines_list */
1082 Curl_none_false_start, /* false_start */
1083 Curl_none_md5sum, /* md5sum */
1084 Curl_mbedtls_sha256sum /* sha256sum */
1085 };
1086
1087 #endif /* USE_MBEDTLS */
1088