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() */
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() */
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
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:
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
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
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: const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
250: conn->host.name;
251: const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
252: int ret = -1;
253: char errorbuf[128];
254: errorbuf[0] = 0;
255:
256: /* mbedTLS only supports SSLv3 and TLSv1 */
257: if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
258: failf(data, "mbedTLS does not support SSLv2");
259: return CURLE_SSL_CONNECT_ERROR;
260: }
261:
262: #ifdef THREADING_SUPPORT
263: entropy_init_mutex(&ts_entropy);
264: mbedtls_ctr_drbg_init(&backend->ctr_drbg);
265:
266: ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, entropy_func_mutex,
267: &ts_entropy, NULL, 0);
268: if(ret) {
269: #ifdef MBEDTLS_ERROR_C
270: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
271: #endif /* MBEDTLS_ERROR_C */
272: failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
273: -ret, errorbuf);
274: }
275: #else
276: mbedtls_entropy_init(&backend->entropy);
277: mbedtls_ctr_drbg_init(&backend->ctr_drbg);
278:
279: ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, mbedtls_entropy_func,
280: &backend->entropy, NULL, 0);
281: if(ret) {
282: #ifdef MBEDTLS_ERROR_C
283: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
284: #endif /* MBEDTLS_ERROR_C */
285: failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
286: -ret, errorbuf);
287: }
288: #endif /* THREADING_SUPPORT */
289:
290: /* Load the trusted CA */
291: mbedtls_x509_crt_init(&backend->cacert);
292:
293: if(ssl_cafile) {
294: ret = mbedtls_x509_crt_parse_file(&backend->cacert, ssl_cafile);
295:
296: if(ret<0) {
297: #ifdef MBEDTLS_ERROR_C
298: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
299: #endif /* MBEDTLS_ERROR_C */
300: failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
301: ssl_cafile, -ret, errorbuf);
302:
303: if(verifypeer)
304: return CURLE_SSL_CACERT_BADFILE;
305: }
306: }
307:
308: if(ssl_capath) {
309: ret = mbedtls_x509_crt_parse_path(&backend->cacert, ssl_capath);
310:
311: if(ret<0) {
312: #ifdef MBEDTLS_ERROR_C
313: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
314: #endif /* MBEDTLS_ERROR_C */
315: failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
316: ssl_capath, -ret, errorbuf);
317:
318: if(verifypeer)
319: return CURLE_SSL_CACERT_BADFILE;
320: }
321: }
322:
323: /* Load the client certificate */
324: mbedtls_x509_crt_init(&backend->clicert);
325:
326: if(ssl_cert) {
327: ret = mbedtls_x509_crt_parse_file(&backend->clicert, ssl_cert);
328:
329: if(ret) {
330: #ifdef MBEDTLS_ERROR_C
331: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
332: #endif /* MBEDTLS_ERROR_C */
333: failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
334: ssl_cert, -ret, errorbuf);
335:
336: return CURLE_SSL_CERTPROBLEM;
337: }
338: }
339:
340: /* Load the client private key */
341: mbedtls_pk_init(&backend->pk);
342:
343: if(SSL_SET_OPTION(key)) {
344: ret = mbedtls_pk_parse_keyfile(&backend->pk, SSL_SET_OPTION(key),
345: SSL_SET_OPTION(key_passwd));
346: if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) ||
347: mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_ECKEY)))
348: ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
349:
350: if(ret) {
351: #ifdef MBEDTLS_ERROR_C
352: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
353: #endif /* MBEDTLS_ERROR_C */
354: failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
355: SSL_SET_OPTION(key), -ret, errorbuf);
356:
357: return CURLE_SSL_CERTPROBLEM;
358: }
359: }
360:
361: /* Load the CRL */
362: mbedtls_x509_crl_init(&backend->crl);
363:
364: if(ssl_crlfile) {
365: ret = mbedtls_x509_crl_parse_file(&backend->crl, ssl_crlfile);
366:
367: if(ret) {
368: #ifdef MBEDTLS_ERROR_C
369: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
370: #endif /* MBEDTLS_ERROR_C */
371: failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
372: ssl_crlfile, -ret, errorbuf);
373:
374: return CURLE_SSL_CRL_BADFILE;
375: }
376: }
377:
378: infof(data, "mbedTLS: Connecting to %s:%ld\n", hostname, port);
379:
380: mbedtls_ssl_config_init(&backend->config);
381:
382: mbedtls_ssl_init(&backend->ssl);
383: if(mbedtls_ssl_setup(&backend->ssl, &backend->config)) {
384: failf(data, "mbedTLS: ssl_init failed");
385: return CURLE_SSL_CONNECT_ERROR;
386: }
387: ret = mbedtls_ssl_config_defaults(&backend->config,
388: MBEDTLS_SSL_IS_CLIENT,
389: MBEDTLS_SSL_TRANSPORT_STREAM,
390: MBEDTLS_SSL_PRESET_DEFAULT);
391: if(ret) {
392: failf(data, "mbedTLS: ssl_config failed");
393: return CURLE_SSL_CONNECT_ERROR;
394: }
395:
396: /* new profile with RSA min key len = 1024 ... */
397: mbedtls_ssl_conf_cert_profile(&backend->config,
398: &mbedtls_x509_crt_profile_fr);
399:
400: switch(SSL_CONN_CONFIG(version)) {
401: case CURL_SSLVERSION_DEFAULT:
402: case CURL_SSLVERSION_TLSv1:
403: mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
404: MBEDTLS_SSL_MINOR_VERSION_1);
405: infof(data, "mbedTLS: Set min SSL version to TLS 1.0\n");
406: break;
407: case CURL_SSLVERSION_SSLv3:
408: mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
409: MBEDTLS_SSL_MINOR_VERSION_0);
410: mbedtls_ssl_conf_max_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
411: MBEDTLS_SSL_MINOR_VERSION_0);
412: infof(data, "mbedTLS: Set SSL version to SSLv3\n");
413: break;
414: case CURL_SSLVERSION_TLSv1_0:
415: case CURL_SSLVERSION_TLSv1_1:
416: case CURL_SSLVERSION_TLSv1_2:
417: case CURL_SSLVERSION_TLSv1_3:
418: {
419: CURLcode result = set_ssl_version_min_max(conn, sockindex);
420: if(result != CURLE_OK)
421: return result;
422: break;
423: }
424: default:
425: failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
426: return CURLE_SSL_CONNECT_ERROR;
427: }
428:
429: mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
430:
431: mbedtls_ssl_conf_rng(&backend->config, mbedtls_ctr_drbg_random,
432: &backend->ctr_drbg);
433: mbedtls_ssl_set_bio(&backend->ssl, &conn->sock[sockindex],
434: mbedtls_net_send,
435: mbedtls_net_recv,
436: NULL /* rev_timeout() */);
437:
438: mbedtls_ssl_conf_ciphersuites(&backend->config,
439: mbedtls_ssl_list_ciphersuites());
440:
441: #if defined(MBEDTLS_SSL_RENEGOTIATION)
442: mbedtls_ssl_conf_renegotiation(&backend->config,
443: MBEDTLS_SSL_RENEGOTIATION_ENABLED);
444: #endif
445:
446: #if defined(MBEDTLS_SSL_SESSION_TICKETS)
447: mbedtls_ssl_conf_session_tickets(&backend->config,
448: MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
449: #endif
450:
451: /* Check if there's a cached ID we can/should use here! */
452: if(SSL_SET_OPTION(primary.sessionid)) {
453: void *old_session = NULL;
454:
455: Curl_ssl_sessionid_lock(conn);
456: if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
457: ret = mbedtls_ssl_set_session(&backend->ssl, old_session);
458: if(ret) {
459: Curl_ssl_sessionid_unlock(conn);
460: failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
461: return CURLE_SSL_CONNECT_ERROR;
462: }
463: infof(data, "mbedTLS re-using session\n");
464: }
465: Curl_ssl_sessionid_unlock(conn);
466: }
467:
468: mbedtls_ssl_conf_ca_chain(&backend->config,
469: &backend->cacert,
470: &backend->crl);
471:
472: if(SSL_SET_OPTION(key)) {
473: mbedtls_ssl_conf_own_cert(&backend->config,
474: &backend->clicert, &backend->pk);
475: }
476: if(mbedtls_ssl_set_hostname(&backend->ssl, hostname)) {
477: /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks *and*
478: the name to set in the SNI extension. So even if curl connects to a
479: host specified as an IP address, this function must be used. */
480: failf(data, "couldn't set hostname in mbedTLS");
481: return CURLE_SSL_CONNECT_ERROR;
482: }
483:
484: #ifdef HAS_ALPN
485: if(conn->bits.tls_enable_alpn) {
486: const char **p = &backend->protocols[0];
487: #ifdef USE_NGHTTP2
488: if(data->set.httpversion >= CURL_HTTP_VERSION_2)
489: *p++ = NGHTTP2_PROTO_VERSION_ID;
490: #endif
491: *p++ = ALPN_HTTP_1_1;
492: *p = NULL;
493: /* this function doesn't clone the protocols array, which is why we need
494: to keep it around */
495: if(mbedtls_ssl_conf_alpn_protocols(&backend->config,
496: &backend->protocols[0])) {
497: failf(data, "Failed setting ALPN protocols");
498: return CURLE_SSL_CONNECT_ERROR;
499: }
500: for(p = &backend->protocols[0]; *p; ++p)
501: infof(data, "ALPN, offering %s\n", *p);
502: }
503: #endif
504:
505: #ifdef MBEDTLS_DEBUG
506: /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
507: mbedtls_ssl_conf_dbg(&backend->config, mbed_debug, data);
508: /* - 0 No debug
509: * - 1 Error
510: * - 2 State change
511: * - 3 Informational
512: * - 4 Verbose
513: */
514: mbedtls_debug_set_threshold(4);
515: #endif
516:
517: /* give application a chance to interfere with mbedTLS set up. */
518: if(data->set.ssl.fsslctx) {
519: ret = (*data->set.ssl.fsslctx)(data, &backend->config,
520: data->set.ssl.fsslctxp);
521: if(ret) {
522: failf(data, "error signaled by ssl ctx callback");
523: return ret;
524: }
525: }
526:
527: connssl->connecting_state = ssl_connect_2;
528:
529: return CURLE_OK;
530: }
531:
532: static CURLcode
533: mbed_connect_step2(struct connectdata *conn,
534: int sockindex)
535: {
536: int ret;
537: struct Curl_easy *data = conn->data;
538: struct ssl_connect_data* connssl = &conn->ssl[sockindex];
539: struct ssl_backend_data *backend = connssl->backend;
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: conn->recv[sockindex] = mbed_recv;
546: conn->send[sockindex] = mbed_send;
547:
548: ret = mbedtls_ssl_handshake(&backend->ssl);
549:
550: if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
551: connssl->connecting_state = ssl_connect_2_reading;
552: return CURLE_OK;
553: }
554: else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
555: connssl->connecting_state = ssl_connect_2_writing;
556: return CURLE_OK;
557: }
558: else if(ret) {
559: char errorbuf[128];
560: errorbuf[0] = 0;
561: #ifdef MBEDTLS_ERROR_C
562: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
563: #endif /* MBEDTLS_ERROR_C */
564: failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
565: -ret, errorbuf);
566: return CURLE_SSL_CONNECT_ERROR;
567: }
568:
569: infof(data, "mbedTLS: Handshake complete, cipher is %s\n",
570: mbedtls_ssl_get_ciphersuite(&backend->ssl)
571: );
572:
573: ret = mbedtls_ssl_get_verify_result(&backend->ssl);
574:
575: if(!SSL_CONN_CONFIG(verifyhost))
576: /* Ignore hostname errors if verifyhost is disabled */
577: ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH;
578:
579: if(ret && SSL_CONN_CONFIG(verifypeer)) {
580: if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
581: failf(data, "Cert verify failed: BADCERT_EXPIRED");
582:
583: else if(ret & MBEDTLS_X509_BADCERT_REVOKED)
584: failf(data, "Cert verify failed: BADCERT_REVOKED");
585:
586: else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
587: failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
588:
589: else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
590: failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
591:
592: else if(ret & MBEDTLS_X509_BADCERT_FUTURE)
593: failf(data, "Cert verify failed: BADCERT_FUTURE");
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: const char *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: Curl_multiuse_state(conn, conn->negnpn == CURL_HTTP_VERSION_2 ?
689: BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
690: }
691: #endif
692:
693: connssl->connecting_state = ssl_connect_3;
694: infof(data, "SSL connected\n");
695:
696: return CURLE_OK;
697: }
698:
699: static CURLcode
700: mbed_connect_step3(struct connectdata *conn,
701: int sockindex)
702: {
703: CURLcode retcode = CURLE_OK;
704: struct ssl_connect_data *connssl = &conn->ssl[sockindex];
705: struct ssl_backend_data *backend = connssl->backend;
706: struct Curl_easy *data = conn->data;
707:
708: DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
709:
710: if(SSL_SET_OPTION(primary.sessionid)) {
711: int ret;
712: mbedtls_ssl_session *our_ssl_sessionid;
713: void *old_ssl_sessionid = NULL;
714:
715: our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
716: if(!our_ssl_sessionid)
717: return CURLE_OUT_OF_MEMORY;
718:
719: mbedtls_ssl_session_init(our_ssl_sessionid);
720:
721: ret = mbedtls_ssl_get_session(&backend->ssl, our_ssl_sessionid);
722: if(ret) {
723: if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
724: mbedtls_ssl_session_free(our_ssl_sessionid);
725: free(our_ssl_sessionid);
726: failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
727: return CURLE_SSL_CONNECT_ERROR;
728: }
729:
730: /* If there's already a matching session in the cache, delete it */
731: Curl_ssl_sessionid_lock(conn);
732: if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
733: Curl_ssl_delsessionid(conn, old_ssl_sessionid);
734:
735: retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
736: Curl_ssl_sessionid_unlock(conn);
737: if(retcode) {
738: mbedtls_ssl_session_free(our_ssl_sessionid);
739: free(our_ssl_sessionid);
740: failf(data, "failed to store ssl session");
741: return retcode;
742: }
743: }
744:
745: connssl->connecting_state = ssl_connect_done;
746:
747: return CURLE_OK;
748: }
749:
750: static ssize_t mbed_send(struct connectdata *conn, int sockindex,
751: const void *mem, size_t len,
752: CURLcode *curlcode)
753: {
754: struct ssl_connect_data *connssl = &conn->ssl[sockindex];
755: struct ssl_backend_data *backend = connssl->backend;
756: int ret = -1;
757:
758: ret = mbedtls_ssl_write(&backend->ssl,
759: (unsigned char *)mem, len);
760:
761: if(ret < 0) {
762: *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
763: CURLE_AGAIN : CURLE_SEND_ERROR;
764: ret = -1;
765: }
766:
767: return ret;
768: }
769:
770: static void Curl_mbedtls_close_all(struct Curl_easy *data)
771: {
772: (void)data;
773: }
774:
775: static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
776: {
777: struct ssl_connect_data *connssl = &conn->ssl[sockindex];
778: struct ssl_backend_data *backend = connssl->backend;
779: mbedtls_pk_free(&backend->pk);
780: mbedtls_x509_crt_free(&backend->clicert);
781: mbedtls_x509_crt_free(&backend->cacert);
782: mbedtls_x509_crl_free(&backend->crl);
783: mbedtls_ssl_config_free(&backend->config);
784: mbedtls_ssl_free(&backend->ssl);
785: mbedtls_ctr_drbg_free(&backend->ctr_drbg);
786: #ifndef THREADING_SUPPORT
787: mbedtls_entropy_free(&backend->entropy);
788: #endif /* THREADING_SUPPORT */
789: }
790:
791: static ssize_t mbed_recv(struct connectdata *conn, int num,
792: char *buf, size_t buffersize,
793: CURLcode *curlcode)
794: {
795: struct ssl_connect_data *connssl = &conn->ssl[num];
796: struct ssl_backend_data *backend = connssl->backend;
797: int ret = -1;
798: ssize_t len = -1;
799:
800: memset(buf, 0, buffersize);
801: ret = mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf,
802: buffersize);
803:
804: if(ret <= 0) {
805: if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
806: return 0;
807:
808: *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
809: CURLE_AGAIN : CURLE_RECV_ERROR;
810: return -1;
811: }
812:
813: len = ret;
814:
815: return len;
816: }
817:
818: static void Curl_mbedtls_session_free(void *ptr)
819: {
820: mbedtls_ssl_session_free(ptr);
821: free(ptr);
822: }
823:
824: static size_t Curl_mbedtls_version(char *buffer, size_t size)
825: {
826: #ifdef MBEDTLS_VERSION_C
827: /* if mbedtls_version_get_number() is available it is better */
828: unsigned int version = mbedtls_version_get_number();
829: return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
830: (version>>16)&0xff, (version>>8)&0xff);
831: #else
832: return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
833: #endif
834: }
835:
836: static CURLcode Curl_mbedtls_random(struct Curl_easy *data,
837: unsigned char *entropy, size_t length)
838: {
839: #if defined(MBEDTLS_CTR_DRBG_C)
840: int ret = -1;
841: char errorbuf[128];
842: mbedtls_entropy_context ctr_entropy;
843: mbedtls_ctr_drbg_context ctr_drbg;
844: mbedtls_entropy_init(&ctr_entropy);
845: mbedtls_ctr_drbg_init(&ctr_drbg);
846: errorbuf[0] = 0;
847:
848: ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
849: &ctr_entropy, NULL, 0);
850:
851: if(ret) {
852: #ifdef MBEDTLS_ERROR_C
853: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
854: #endif /* MBEDTLS_ERROR_C */
855: failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
856: -ret, errorbuf);
857: }
858: else {
859: ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
860:
861: if(ret) {
862: #ifdef MBEDTLS_ERROR_C
863: mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
864: #endif /* MBEDTLS_ERROR_C */
865: failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
866: -ret, errorbuf);
867: }
868: }
869:
870: mbedtls_ctr_drbg_free(&ctr_drbg);
871: mbedtls_entropy_free(&ctr_entropy);
872:
873: return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
874: #elif defined(MBEDTLS_HAVEGE_C)
875: mbedtls_havege_state hs;
876: mbedtls_havege_init(&hs);
877: mbedtls_havege_random(&hs, entropy, length);
878: mbedtls_havege_free(&hs);
879: return CURLE_OK;
880: #else
881: return CURLE_NOT_BUILT_IN;
882: #endif
883: }
884:
885: static CURLcode
886: mbed_connect_common(struct connectdata *conn,
887: int sockindex,
888: bool nonblocking,
889: bool *done)
890: {
891: CURLcode retcode;
892: struct Curl_easy *data = conn->data;
893: struct ssl_connect_data *connssl = &conn->ssl[sockindex];
894: curl_socket_t sockfd = conn->sock[sockindex];
895: timediff_t timeout_ms;
896: int what;
897:
898: /* check if the connection has already been established */
899: if(ssl_connection_complete == connssl->state) {
900: *done = TRUE;
901: return CURLE_OK;
902: }
903:
904: if(ssl_connect_1 == connssl->connecting_state) {
905: /* Find out how much more time we're allowed */
906: timeout_ms = Curl_timeleft(data, NULL, TRUE);
907:
908: if(timeout_ms < 0) {
909: /* no need to continue if time already is up */
910: failf(data, "SSL connection timeout");
911: return CURLE_OPERATION_TIMEDOUT;
912: }
913: retcode = mbed_connect_step1(conn, sockindex);
914: if(retcode)
915: return retcode;
916: }
917:
918: while(ssl_connect_2 == connssl->connecting_state ||
919: ssl_connect_2_reading == connssl->connecting_state ||
920: ssl_connect_2_writing == connssl->connecting_state) {
921:
922: /* check allowed time left */
923: timeout_ms = Curl_timeleft(data, NULL, TRUE);
924:
925: if(timeout_ms < 0) {
926: /* no need to continue if time already is up */
927: failf(data, "SSL connection timeout");
928: return CURLE_OPERATION_TIMEDOUT;
929: }
930:
931: /* if ssl is expecting something, check if it's available. */
932: if(connssl->connecting_state == ssl_connect_2_reading
933: || connssl->connecting_state == ssl_connect_2_writing) {
934:
935: curl_socket_t writefd = ssl_connect_2_writing ==
936: connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
937: curl_socket_t readfd = ssl_connect_2_reading ==
938: connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
939:
940: what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
941: nonblocking ? 0 : (time_t)timeout_ms);
942: if(what < 0) {
943: /* fatal error */
944: failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
945: return CURLE_SSL_CONNECT_ERROR;
946: }
947: else if(0 == what) {
948: if(nonblocking) {
949: *done = FALSE;
950: return CURLE_OK;
951: }
952: else {
953: /* timeout */
954: failf(data, "SSL connection timeout");
955: return CURLE_OPERATION_TIMEDOUT;
956: }
957: }
958: /* socket is readable or writable */
959: }
960:
961: /* Run transaction, and return to the caller if it failed or if
962: * this connection is part of a multi handle and this loop would
963: * execute again. This permits the owner of a multi handle to
964: * abort a connection attempt before step2 has completed while
965: * ensuring that a client using select() or epoll() will always
966: * have a valid fdset to wait on.
967: */
968: retcode = mbed_connect_step2(conn, sockindex);
969: if(retcode || (nonblocking &&
970: (ssl_connect_2 == connssl->connecting_state ||
971: ssl_connect_2_reading == connssl->connecting_state ||
972: ssl_connect_2_writing == connssl->connecting_state)))
973: return retcode;
974:
975: } /* repeat step2 until all transactions are done. */
976:
977: if(ssl_connect_3 == connssl->connecting_state) {
978: retcode = mbed_connect_step3(conn, sockindex);
979: if(retcode)
980: return retcode;
981: }
982:
983: if(ssl_connect_done == connssl->connecting_state) {
984: connssl->state = ssl_connection_complete;
985: conn->recv[sockindex] = mbed_recv;
986: conn->send[sockindex] = mbed_send;
987: *done = TRUE;
988: }
989: else
990: *done = FALSE;
991:
992: /* Reset our connect state machine */
993: connssl->connecting_state = ssl_connect_1;
994:
995: return CURLE_OK;
996: }
997:
998: static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
999: int sockindex, bool *done)
1000: {
1001: return mbed_connect_common(conn, sockindex, TRUE, done);
1002: }
1003:
1004:
1005: static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
1006: {
1007: CURLcode retcode;
1008: bool done = FALSE;
1009:
1010: retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
1011: if(retcode)
1012: return retcode;
1013:
1014: DEBUGASSERT(done);
1015:
1016: return CURLE_OK;
1017: }
1018:
1019: /*
1020: * return 0 error initializing SSL
1021: * return 1 SSL initialized successfully
1022: */
1023: static int Curl_mbedtls_init(void)
1024: {
1025: return Curl_mbedtlsthreadlock_thread_setup();
1026: }
1027:
1028: static void Curl_mbedtls_cleanup(void)
1029: {
1030: (void)Curl_mbedtlsthreadlock_thread_cleanup();
1031: }
1032:
1033: static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
1034: int sockindex)
1035: {
1036: const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
1037: struct ssl_backend_data *backend = connssl->backend;
1038: return mbedtls_ssl_get_bytes_avail(&backend->ssl) != 0;
1039: }
1040:
1041: static CURLcode Curl_mbedtls_sha256sum(const unsigned char *input,
1042: size_t inputlen,
1043: unsigned char *sha256sum,
1044: size_t sha256len UNUSED_PARAM)
1045: {
1046: (void)sha256len;
1047: #if MBEDTLS_VERSION_NUMBER < 0x02070000
1048: mbedtls_sha256(input, inputlen, sha256sum, 0);
1049: #else
1050: /* returns 0 on success, otherwise failure */
1051: if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
1052: return CURLE_BAD_FUNCTION_ARGUMENT;
1053: #endif
1054: return CURLE_OK;
1055: }
1056:
1057: static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
1058: CURLINFO info UNUSED_PARAM)
1059: {
1060: struct ssl_backend_data *backend = connssl->backend;
1061: (void)info;
1062: return &backend->ssl;
1063: }
1064:
1065: const struct Curl_ssl Curl_ssl_mbedtls = {
1066: { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
1067:
1068: SSLSUPP_CA_PATH |
1069: SSLSUPP_PINNEDPUBKEY |
1070: SSLSUPP_SSL_CTX,
1071:
1072: sizeof(struct ssl_backend_data),
1073:
1074: Curl_mbedtls_init, /* init */
1075: Curl_mbedtls_cleanup, /* cleanup */
1076: Curl_mbedtls_version, /* version */
1077: Curl_none_check_cxn, /* check_cxn */
1078: Curl_none_shutdown, /* shutdown */
1079: Curl_mbedtls_data_pending, /* data_pending */
1080: Curl_mbedtls_random, /* random */
1081: Curl_none_cert_status_request, /* cert_status_request */
1082: Curl_mbedtls_connect, /* connect */
1083: Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
1084: Curl_mbedtls_get_internals, /* get_internals */
1085: Curl_mbedtls_close, /* close_one */
1086: Curl_mbedtls_close_all, /* close_all */
1087: Curl_mbedtls_session_free, /* session_free */
1088: Curl_none_set_engine, /* set_engine */
1089: Curl_none_set_engine_default, /* set_engine_default */
1090: Curl_none_engines_list, /* engines_list */
1091: Curl_none_false_start, /* false_start */
1092: Curl_none_md5sum, /* md5sum */
1093: Curl_mbedtls_sha256sum /* sha256sum */
1094: };
1095:
1096: #endif /* USE_MBEDTLS */
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