1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2012 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
9 * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
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 PolarSSL-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_POLARSSL
33 #include <polarssl/net.h>
34 #include <polarssl/ssl.h>
35 #include <polarssl/certs.h>
36 #include <polarssl/x509.h>
37 #include <polarssl/version.h>
38 #include <polarssl/sha256.h>
39
40 #if POLARSSL_VERSION_NUMBER < 0x01030000
41 #error too old PolarSSL
42 #endif
43
44 #include <polarssl/error.h>
45 #include <polarssl/entropy.h>
46 #include <polarssl/ctr_drbg.h>
47
48 #include "urldata.h"
49 #include "sendf.h"
50 #include "inet_pton.h"
51 #include "polarssl.h"
52 #include "vtls.h"
53 #include "parsedate.h"
54 #include "connect.h" /* for the connect timeout */
55 #include "select.h"
56 #include "strcase.h"
57 #include "polarssl_threadlock.h"
58 #include "curl_printf.h"
59 #include "curl_memory.h"
60 /* The last #include file should be: */
61 #include "memdebug.h"
62
63 /* See https://tls.mbed.org/discussions/generic/
64 howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
65 */
66 #define RSA_PUB_DER_MAX_BYTES (38 + 2 * POLARSSL_MPI_MAX_SIZE)
67 #define ECP_PUB_DER_MAX_BYTES (30 + 2 * POLARSSL_ECP_MAX_BYTES)
68
69 #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
70 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
71
72 struct ssl_backend_data {
73 ctr_drbg_context ctr_drbg;
74 entropy_context entropy;
75 ssl_context ssl;
76 int server_fd;
77 x509_crt cacert;
78 x509_crt clicert;
79 x509_crl crl;
80 rsa_context rsa;
81 };
82
83 #define BACKEND connssl->backend
84
85 /* apply threading? */
86 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
87 #define THREADING_SUPPORT
88 #endif
89
90 #ifndef POLARSSL_ERROR_C
91 #define error_strerror(x,y,z)
92 #endif /* POLARSSL_ERROR_C */
93
94
95 #if defined(THREADING_SUPPORT)
96 static entropy_context entropy;
97
98 static int entropy_init_initialized = 0;
99
100 /* start of entropy_init_mutex() */
entropy_init_mutex(entropy_context * ctx)101 static void entropy_init_mutex(entropy_context *ctx)
102 {
103 /* lock 0 = entropy_init_mutex() */
104 Curl_polarsslthreadlock_lock_function(0);
105 if(entropy_init_initialized == 0) {
106 entropy_init(ctx);
107 entropy_init_initialized = 1;
108 }
109 Curl_polarsslthreadlock_unlock_function(0);
110 }
111 /* end of entropy_init_mutex() */
112
113 /* start of entropy_func_mutex() */
entropy_func_mutex(void * data,unsigned char * output,size_t len)114 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
115 {
116 int ret;
117 /* lock 1 = entropy_func_mutex() */
118 Curl_polarsslthreadlock_lock_function(1);
119 ret = entropy_func(data, output, len);
120 Curl_polarsslthreadlock_unlock_function(1);
121
122 return ret;
123 }
124 /* end of entropy_func_mutex() */
125
126 #endif /* THREADING_SUPPORT */
127
128 /* Define this to enable lots of debugging for PolarSSL */
129 #undef POLARSSL_DEBUG
130
131 #ifdef POLARSSL_DEBUG
polarssl_debug(void * context,int level,const char * line)132 static void polarssl_debug(void *context, int level, const char *line)
133 {
134 struct Curl_easy *data = NULL;
135
136 if(!context)
137 return;
138
139 data = (struct Curl_easy *)context;
140
141 infof(data, "%s", line);
142 (void) level;
143 }
144 #else
145 #endif
146
147 /* ALPN for http2? */
148 #ifdef POLARSSL_SSL_ALPN
149 # define HAS_ALPN
150 #endif
151
152 static Curl_recv polarssl_recv;
153 static Curl_send polarssl_send;
154
polarssl_version_from_curl(int * polarver,long ssl_version)155 static CURLcode polarssl_version_from_curl(int *polarver, long ssl_version)
156 {
157 switch(ssl_version) {
158 case CURL_SSLVERSION_TLSv1_0:
159 *polarver = SSL_MINOR_VERSION_1;
160 return CURLE_OK;
161 case CURL_SSLVERSION_TLSv1_1:
162 *polarver = SSL_MINOR_VERSION_2;
163 return CURLE_OK;
164 case CURL_SSLVERSION_TLSv1_2:
165 *polarver = SSL_MINOR_VERSION_3;
166 return CURLE_OK;
167 case CURL_SSLVERSION_TLSv1_3:
168 break;
169 }
170 return CURLE_SSL_CONNECT_ERROR;
171 }
172
173 static CURLcode
set_ssl_version_min_max(struct connectdata * conn,int sockindex)174 set_ssl_version_min_max(struct connectdata *conn, int sockindex)
175 {
176 struct Curl_easy *data = conn->data;
177 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
178 long ssl_version = SSL_CONN_CONFIG(version);
179 long ssl_version_max = SSL_CONN_CONFIG(version_max);
180 int ssl_min_ver = SSL_MINOR_VERSION_1;
181 int ssl_max_ver = SSL_MINOR_VERSION_1;
182 CURLcode result = CURLE_OK;
183
184 switch(ssl_version) {
185 case CURL_SSLVERSION_DEFAULT:
186 case CURL_SSLVERSION_TLSv1:
187 ssl_version = CURL_SSLVERSION_TLSv1_0;
188 break;
189 }
190
191 switch(ssl_version_max) {
192 case CURL_SSLVERSION_MAX_NONE:
193 case CURL_SSLVERSION_MAX_DEFAULT:
194 ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
195 break;
196 }
197
198 result = polarssl_version_from_curl(&ssl_min_ver, ssl_version);
199 if(result) {
200 failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
201 return result;
202 }
203 result = polarssl_version_from_curl(&ssl_max_ver, ssl_version_max >> 16);
204 if(result) {
205 failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
206 return result;
207 }
208
209 ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3, ssl_min_ver);
210 ssl_set_max_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3, ssl_max_ver);
211
212 return result;
213 }
214
215 static CURLcode
polarssl_connect_step1(struct connectdata * conn,int sockindex)216 polarssl_connect_step1(struct connectdata *conn,
217 int sockindex)
218 {
219 struct Curl_easy *data = conn->data;
220 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
221 const char *capath = SSL_CONN_CONFIG(CApath);
222 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
223 conn->host.name;
224 const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
225 int ret = -1;
226 char errorbuf[128];
227 errorbuf[0] = 0;
228
229 /* PolarSSL only supports SSLv3 and TLSv1 */
230 if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
231 failf(data, "PolarSSL does not support SSLv2");
232 return CURLE_SSL_CONNECT_ERROR;
233 }
234
235 #ifdef THREADING_SUPPORT
236 entropy_init_mutex(&entropy);
237
238 if((ret = ctr_drbg_init(&BACKEND->ctr_drbg, entropy_func_mutex, &entropy,
239 NULL, 0)) != 0) {
240 error_strerror(ret, errorbuf, sizeof(errorbuf));
241 failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
242 -ret, errorbuf);
243 }
244 #else
245 entropy_init(&BACKEND->entropy);
246
247 if((ret = ctr_drbg_init(&BACKEND->ctr_drbg, entropy_func, &BACKEND->entropy,
248 NULL, 0)) != 0) {
249 error_strerror(ret, errorbuf, sizeof(errorbuf));
250 failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
251 -ret, errorbuf);
252 }
253 #endif /* THREADING_SUPPORT */
254
255 /* Load the trusted CA */
256 memset(&BACKEND->cacert, 0, sizeof(x509_crt));
257
258 if(SSL_CONN_CONFIG(CAfile)) {
259 ret = x509_crt_parse_file(&BACKEND->cacert,
260 SSL_CONN_CONFIG(CAfile));
261
262 if(ret<0) {
263 error_strerror(ret, errorbuf, sizeof(errorbuf));
264 failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s",
265 SSL_CONN_CONFIG(CAfile), -ret, errorbuf);
266
267 if(SSL_CONN_CONFIG(verifypeer))
268 return CURLE_SSL_CACERT_BADFILE;
269 }
270 }
271
272 if(capath) {
273 ret = x509_crt_parse_path(&BACKEND->cacert, capath);
274
275 if(ret<0) {
276 error_strerror(ret, errorbuf, sizeof(errorbuf));
277 failf(data, "Error reading ca cert path %s - PolarSSL: (-0x%04X) %s",
278 capath, -ret, errorbuf);
279
280 if(SSL_CONN_CONFIG(verifypeer))
281 return CURLE_SSL_CACERT_BADFILE;
282 }
283 }
284
285 /* Load the client certificate */
286 memset(&BACKEND->clicert, 0, sizeof(x509_crt));
287
288 if(SSL_SET_OPTION(cert)) {
289 ret = x509_crt_parse_file(&BACKEND->clicert,
290 SSL_SET_OPTION(cert));
291
292 if(ret) {
293 error_strerror(ret, errorbuf, sizeof(errorbuf));
294 failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
295 SSL_SET_OPTION(cert), -ret, errorbuf);
296
297 return CURLE_SSL_CERTPROBLEM;
298 }
299 }
300
301 /* Load the client private key */
302 if(SSL_SET_OPTION(key)) {
303 pk_context pk;
304 pk_init(&pk);
305 ret = pk_parse_keyfile(&pk, SSL_SET_OPTION(key),
306 SSL_SET_OPTION(key_passwd));
307 if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA))
308 ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
309 if(ret == 0)
310 rsa_copy(&BACKEND->rsa, pk_rsa(pk));
311 else
312 rsa_free(&BACKEND->rsa);
313 pk_free(&pk);
314
315 if(ret) {
316 error_strerror(ret, errorbuf, sizeof(errorbuf));
317 failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
318 SSL_SET_OPTION(key), -ret, errorbuf);
319
320 return CURLE_SSL_CERTPROBLEM;
321 }
322 }
323
324 /* Load the CRL */
325 memset(&BACKEND->crl, 0, sizeof(x509_crl));
326
327 if(SSL_SET_OPTION(CRLfile)) {
328 ret = x509_crl_parse_file(&BACKEND->crl,
329 SSL_SET_OPTION(CRLfile));
330
331 if(ret) {
332 error_strerror(ret, errorbuf, sizeof(errorbuf));
333 failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
334 SSL_SET_OPTION(CRLfile), -ret, errorbuf);
335
336 return CURLE_SSL_CRL_BADFILE;
337 }
338 }
339
340 infof(data, "PolarSSL: Connecting to %s:%d\n", hostname, port);
341
342 if(ssl_init(&BACKEND->ssl)) {
343 failf(data, "PolarSSL: ssl_init failed");
344 return CURLE_SSL_CONNECT_ERROR;
345 }
346
347 switch(SSL_CONN_CONFIG(version)) {
348 case CURL_SSLVERSION_DEFAULT:
349 case CURL_SSLVERSION_TLSv1:
350 ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
351 SSL_MINOR_VERSION_1);
352 break;
353 case CURL_SSLVERSION_SSLv3:
354 ssl_set_min_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
355 SSL_MINOR_VERSION_0);
356 ssl_set_max_version(&BACKEND->ssl, SSL_MAJOR_VERSION_3,
357 SSL_MINOR_VERSION_0);
358 infof(data, "PolarSSL: Forced min. SSL Version to be SSLv3\n");
359 break;
360 case CURL_SSLVERSION_TLSv1_0:
361 case CURL_SSLVERSION_TLSv1_1:
362 case CURL_SSLVERSION_TLSv1_2:
363 case CURL_SSLVERSION_TLSv1_3:
364 {
365 CURLcode result = set_ssl_version_min_max(conn, sockindex);
366 if(result != CURLE_OK)
367 return result;
368 break;
369 }
370 default:
371 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
372 return CURLE_SSL_CONNECT_ERROR;
373 }
374
375 ssl_set_endpoint(&BACKEND->ssl, SSL_IS_CLIENT);
376 ssl_set_authmode(&BACKEND->ssl, SSL_VERIFY_OPTIONAL);
377
378 ssl_set_rng(&BACKEND->ssl, ctr_drbg_random,
379 &BACKEND->ctr_drbg);
380 ssl_set_bio(&BACKEND->ssl,
381 net_recv, &conn->sock[sockindex],
382 net_send, &conn->sock[sockindex]);
383
384 ssl_set_ciphersuites(&BACKEND->ssl, ssl_list_ciphersuites());
385
386 /* Check if there's a cached ID we can/should use here! */
387 if(SSL_SET_OPTION(primary.sessionid)) {
388 void *old_session = NULL;
389
390 Curl_ssl_sessionid_lock(conn);
391 if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
392 ret = ssl_set_session(&BACKEND->ssl, old_session);
393 if(ret) {
394 Curl_ssl_sessionid_unlock(conn);
395 failf(data, "ssl_set_session returned -0x%x", -ret);
396 return CURLE_SSL_CONNECT_ERROR;
397 }
398 infof(data, "PolarSSL re-using session\n");
399 }
400 Curl_ssl_sessionid_unlock(conn);
401 }
402
403 ssl_set_ca_chain(&BACKEND->ssl,
404 &BACKEND->cacert,
405 &BACKEND->crl,
406 hostname);
407
408 ssl_set_own_cert_rsa(&BACKEND->ssl,
409 &BACKEND->clicert, &BACKEND->rsa);
410
411 if(ssl_set_hostname(&BACKEND->ssl, hostname)) {
412 /* ssl_set_hostname() sets the name to use in CN/SAN checks *and* the name
413 to set in the SNI extension. So even if curl connects to a host
414 specified as an IP address, this function must be used. */
415 failf(data, "couldn't set hostname in PolarSSL");
416 return CURLE_SSL_CONNECT_ERROR;
417 }
418
419 #ifdef HAS_ALPN
420 if(conn->bits.tls_enable_alpn) {
421 static const char *protocols[3];
422 int cur = 0;
423
424 #ifdef USE_NGHTTP2
425 if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
426 protocols[cur++] = NGHTTP2_PROTO_VERSION_ID;
427 infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
428 }
429 #endif
430
431 protocols[cur++] = ALPN_HTTP_1_1;
432 infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1);
433
434 protocols[cur] = NULL;
435
436 ssl_set_alpn_protocols(&BACKEND->ssl, protocols);
437 }
438 #endif
439
440 #ifdef POLARSSL_DEBUG
441 ssl_set_dbg(&BACKEND->ssl, polarssl_debug, data);
442 #endif
443
444 connssl->connecting_state = ssl_connect_2;
445
446 return CURLE_OK;
447 }
448
449 static CURLcode
polarssl_connect_step2(struct connectdata * conn,int sockindex)450 polarssl_connect_step2(struct connectdata *conn,
451 int sockindex)
452 {
453 int ret;
454 struct Curl_easy *data = conn->data;
455 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
456 char buffer[1024];
457 const char * const pinnedpubkey = SSL_IS_PROXY() ?
458 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
459 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
460
461
462 char errorbuf[128];
463 errorbuf[0] = 0;
464
465 conn->recv[sockindex] = polarssl_recv;
466 conn->send[sockindex] = polarssl_send;
467
468 ret = ssl_handshake(&BACKEND->ssl);
469
470 switch(ret) {
471 case 0:
472 break;
473
474 case POLARSSL_ERR_NET_WANT_READ:
475 connssl->connecting_state = ssl_connect_2_reading;
476 return CURLE_OK;
477
478 case POLARSSL_ERR_NET_WANT_WRITE:
479 connssl->connecting_state = ssl_connect_2_writing;
480 return CURLE_OK;
481
482 default:
483 error_strerror(ret, errorbuf, sizeof(errorbuf));
484 failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
485 -ret, errorbuf);
486 return CURLE_SSL_CONNECT_ERROR;
487 }
488
489 infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
490 ssl_get_ciphersuite(&BACKEND->ssl) );
491
492 ret = ssl_get_verify_result(&BACKEND->ssl);
493
494 if(ret && SSL_CONN_CONFIG(verifypeer)) {
495 if(ret & BADCERT_EXPIRED)
496 failf(data, "Cert verify failed: BADCERT_EXPIRED");
497
498 if(ret & BADCERT_REVOKED) {
499 failf(data, "Cert verify failed: BADCERT_REVOKED");
500 return CURLE_PEER_FAILED_VERIFICATION;
501 }
502
503 if(ret & BADCERT_CN_MISMATCH)
504 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
505
506 if(ret & BADCERT_NOT_TRUSTED)
507 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
508
509 return CURLE_PEER_FAILED_VERIFICATION;
510 }
511
512 if(ssl_get_peer_cert(&(BACKEND->ssl))) {
513 /* If the session was resumed, there will be no peer certs */
514 memset(buffer, 0, sizeof(buffer));
515
516 if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ",
517 ssl_get_peer_cert(&(BACKEND->ssl))) != -1)
518 infof(data, "Dumping cert info:\n%s\n", buffer);
519 }
520
521 /* adapted from mbedtls.c */
522 if(pinnedpubkey) {
523 int size;
524 CURLcode result;
525 x509_crt *p;
526 unsigned char pubkey[PUB_DER_MAX_BYTES];
527 const x509_crt *peercert;
528
529 peercert = ssl_get_peer_cert(&BACKEND->ssl);
530
531 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
532 failf(data, "Failed due to missing peer certificate");
533 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
534 }
535
536 p = calloc(1, sizeof(*p));
537
538 if(!p)
539 return CURLE_OUT_OF_MEMORY;
540
541 x509_crt_init(p);
542
543 /* Make a copy of our const peercert because pk_write_pubkey_der
544 needs a non-const key, for now.
545 https://github.com/ARMmbed/mbedtls/issues/396 */
546 if(x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
547 failf(data, "Failed copying peer certificate");
548 x509_crt_free(p);
549 free(p);
550 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
551 }
552
553 size = pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
554
555 if(size <= 0) {
556 failf(data, "Failed copying public key from peer certificate");
557 x509_crt_free(p);
558 free(p);
559 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
560 }
561
562 /* pk_write_pubkey_der writes data at the end of the buffer. */
563 result = Curl_pin_peer_pubkey(data,
564 pinnedpubkey,
565 &pubkey[PUB_DER_MAX_BYTES - size], size);
566 if(result) {
567 x509_crt_free(p);
568 free(p);
569 return result;
570 }
571
572 x509_crt_free(p);
573 free(p);
574 }
575
576 #ifdef HAS_ALPN
577 if(conn->bits.tls_enable_alpn) {
578 const char *next_protocol = ssl_get_alpn_protocol(&BACKEND->ssl);
579
580 if(next_protocol != NULL) {
581 infof(data, "ALPN, server accepted to use %s\n", next_protocol);
582
583 #ifdef USE_NGHTTP2
584 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
585 NGHTTP2_PROTO_VERSION_ID_LEN)) {
586 conn->negnpn = CURL_HTTP_VERSION_2;
587 }
588 else
589 #endif
590 if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) {
591 conn->negnpn = CURL_HTTP_VERSION_1_1;
592 }
593 }
594 else
595 infof(data, "ALPN, server did not agree to a protocol\n");
596 }
597 #endif
598
599 connssl->connecting_state = ssl_connect_3;
600 infof(data, "SSL connected\n");
601
602 return CURLE_OK;
603 }
604
605 static CURLcode
polarssl_connect_step3(struct connectdata * conn,int sockindex)606 polarssl_connect_step3(struct connectdata *conn,
607 int sockindex)
608 {
609 CURLcode retcode = CURLE_OK;
610 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
611 struct Curl_easy *data = conn->data;
612
613 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
614
615 if(SSL_SET_OPTION(primary.sessionid)) {
616 int ret;
617 ssl_session *our_ssl_sessionid;
618 void *old_ssl_sessionid = NULL;
619
620 our_ssl_sessionid = calloc(1, sizeof(ssl_session));
621 if(!our_ssl_sessionid)
622 return CURLE_OUT_OF_MEMORY;
623
624 ret = ssl_get_session(&BACKEND->ssl, our_ssl_sessionid);
625 if(ret) {
626 failf(data, "ssl_get_session returned -0x%x", -ret);
627 return CURLE_SSL_CONNECT_ERROR;
628 }
629
630 /* If there's already a matching session in the cache, delete it */
631 Curl_ssl_sessionid_lock(conn);
632 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
633 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
634
635 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
636 Curl_ssl_sessionid_unlock(conn);
637 if(retcode) {
638 free(our_ssl_sessionid);
639 failf(data, "failed to store ssl session");
640 return retcode;
641 }
642 }
643
644 connssl->connecting_state = ssl_connect_done;
645
646 return CURLE_OK;
647 }
648
polarssl_send(struct connectdata * conn,int sockindex,const void * mem,size_t len,CURLcode * curlcode)649 static ssize_t polarssl_send(struct connectdata *conn,
650 int sockindex,
651 const void *mem,
652 size_t len,
653 CURLcode *curlcode)
654 {
655 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
656 int ret = -1;
657
658 ret = ssl_write(&BACKEND->ssl,
659 (unsigned char *)mem, len);
660
661 if(ret < 0) {
662 *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
663 CURLE_AGAIN : CURLE_SEND_ERROR;
664 ret = -1;
665 }
666
667 return ret;
668 }
669
Curl_polarssl_close(struct connectdata * conn,int sockindex)670 static void Curl_polarssl_close(struct connectdata *conn, int sockindex)
671 {
672 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
673 rsa_free(&BACKEND->rsa);
674 x509_crt_free(&BACKEND->clicert);
675 x509_crt_free(&BACKEND->cacert);
676 x509_crl_free(&BACKEND->crl);
677 ssl_free(&BACKEND->ssl);
678 }
679
polarssl_recv(struct connectdata * conn,int num,char * buf,size_t buffersize,CURLcode * curlcode)680 static ssize_t polarssl_recv(struct connectdata *conn,
681 int num,
682 char *buf,
683 size_t buffersize,
684 CURLcode *curlcode)
685 {
686 struct ssl_connect_data *connssl = &conn->ssl[num];
687 int ret = -1;
688 ssize_t len = -1;
689
690 memset(buf, 0, buffersize);
691 ret = ssl_read(&BACKEND->ssl, (unsigned char *)buf, buffersize);
692
693 if(ret <= 0) {
694 if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
695 return 0;
696
697 *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
698 CURLE_AGAIN : CURLE_RECV_ERROR;
699 return -1;
700 }
701
702 len = ret;
703
704 return len;
705 }
706
Curl_polarssl_session_free(void * ptr)707 static void Curl_polarssl_session_free(void *ptr)
708 {
709 ssl_session_free(ptr);
710 free(ptr);
711 }
712
713 /* 1.3.10 was the first rebranded version. All new releases (in 1.3 branch and
714 higher) will be mbed TLS branded.. */
715
Curl_polarssl_version(char * buffer,size_t size)716 static size_t Curl_polarssl_version(char *buffer, size_t size)
717 {
718 unsigned int version = version_get_number();
719 return msnprintf(buffer, size, "%s/%d.%d.%d",
720 version >= 0x01030A00?"mbedTLS":"PolarSSL",
721 version>>24, (version>>16)&0xff, (version>>8)&0xff);
722 }
723
724 static CURLcode
polarssl_connect_common(struct connectdata * conn,int sockindex,bool nonblocking,bool * done)725 polarssl_connect_common(struct connectdata *conn,
726 int sockindex,
727 bool nonblocking,
728 bool *done)
729 {
730 CURLcode result;
731 struct Curl_easy *data = conn->data;
732 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
733 curl_socket_t sockfd = conn->sock[sockindex];
734 long timeout_ms;
735 int what;
736
737 /* check if the connection has already been established */
738 if(ssl_connection_complete == connssl->state) {
739 *done = TRUE;
740 return CURLE_OK;
741 }
742
743 if(ssl_connect_1 == connssl->connecting_state) {
744 /* Find out how much more time we're allowed */
745 timeout_ms = Curl_timeleft(data, NULL, TRUE);
746
747 if(timeout_ms < 0) {
748 /* no need to continue if time already is up */
749 failf(data, "SSL connection timeout");
750 return CURLE_OPERATION_TIMEDOUT;
751 }
752
753 result = polarssl_connect_step1(conn, sockindex);
754 if(result)
755 return result;
756 }
757
758 while(ssl_connect_2 == connssl->connecting_state ||
759 ssl_connect_2_reading == connssl->connecting_state ||
760 ssl_connect_2_writing == connssl->connecting_state) {
761
762 /* check allowed time left */
763 timeout_ms = Curl_timeleft(data, NULL, TRUE);
764
765 if(timeout_ms < 0) {
766 /* no need to continue if time already is up */
767 failf(data, "SSL connection timeout");
768 return CURLE_OPERATION_TIMEDOUT;
769 }
770
771 /* if ssl is expecting something, check if it's available. */
772 if(connssl->connecting_state == ssl_connect_2_reading ||
773 connssl->connecting_state == ssl_connect_2_writing) {
774
775 curl_socket_t writefd = ssl_connect_2_writing ==
776 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
777 curl_socket_t readfd = ssl_connect_2_reading ==
778 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
779
780 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
781 nonblocking?0:timeout_ms);
782 if(what < 0) {
783 /* fatal error */
784 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
785 return CURLE_SSL_CONNECT_ERROR;
786 }
787 else if(0 == what) {
788 if(nonblocking) {
789 *done = FALSE;
790 return CURLE_OK;
791 }
792 else {
793 /* timeout */
794 failf(data, "SSL connection timeout");
795 return CURLE_OPERATION_TIMEDOUT;
796 }
797 }
798 /* socket is readable or writable */
799 }
800
801 /* Run transaction, and return to the caller if it failed or if
802 * this connection is part of a multi handle and this loop would
803 * execute again. This permits the owner of a multi handle to
804 * abort a connection attempt before step2 has completed while
805 * ensuring that a client using select() or epoll() will always
806 * have a valid fdset to wait on.
807 */
808 result = polarssl_connect_step2(conn, sockindex);
809 if(result || (nonblocking &&
810 (ssl_connect_2 == connssl->connecting_state ||
811 ssl_connect_2_reading == connssl->connecting_state ||
812 ssl_connect_2_writing == connssl->connecting_state)))
813 return result;
814
815 } /* repeat step2 until all transactions are done. */
816
817 if(ssl_connect_3 == connssl->connecting_state) {
818 result = polarssl_connect_step3(conn, sockindex);
819 if(result)
820 return result;
821 }
822
823 if(ssl_connect_done == connssl->connecting_state) {
824 connssl->state = ssl_connection_complete;
825 conn->recv[sockindex] = polarssl_recv;
826 conn->send[sockindex] = polarssl_send;
827 *done = TRUE;
828 }
829 else
830 *done = FALSE;
831
832 /* Reset our connect state machine */
833 connssl->connecting_state = ssl_connect_1;
834
835 return CURLE_OK;
836 }
837
Curl_polarssl_connect_nonblocking(struct connectdata * conn,int sockindex,bool * done)838 static CURLcode Curl_polarssl_connect_nonblocking(struct connectdata *conn,
839 int sockindex, bool *done)
840 {
841 return polarssl_connect_common(conn, sockindex, TRUE, done);
842 }
843
844
Curl_polarssl_connect(struct connectdata * conn,int sockindex)845 static CURLcode Curl_polarssl_connect(struct connectdata *conn, int sockindex)
846 {
847 CURLcode result;
848 bool done = FALSE;
849
850 result = polarssl_connect_common(conn, sockindex, FALSE, &done);
851 if(result)
852 return result;
853
854 DEBUGASSERT(done);
855
856 return CURLE_OK;
857 }
858
859 /*
860 * return 0 error initializing SSL
861 * return 1 SSL initialized successfully
862 */
Curl_polarssl_init(void)863 static int Curl_polarssl_init(void)
864 {
865 return Curl_polarsslthreadlock_thread_setup();
866 }
867
Curl_polarssl_cleanup(void)868 static void Curl_polarssl_cleanup(void)
869 {
870 (void)Curl_polarsslthreadlock_thread_cleanup();
871 }
872
Curl_polarssl_data_pending(const struct connectdata * conn,int sockindex)873 static bool Curl_polarssl_data_pending(const struct connectdata *conn,
874 int sockindex)
875 {
876 const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
877 return ssl_get_bytes_avail(&BACKEND->ssl) != 0;
878 }
879
Curl_polarssl_sha256sum(const unsigned char * input,size_t inputlen,unsigned char * sha256sum,size_t sha256len UNUSED_PARAM)880 static CURLcode Curl_polarssl_sha256sum(const unsigned char *input,
881 size_t inputlen,
882 unsigned char *sha256sum,
883 size_t sha256len UNUSED_PARAM)
884 {
885 (void)sha256len;
886 sha256(input, inputlen, sha256sum, 0);
887 return CURLE_OK;
888 }
889
Curl_polarssl_get_internals(struct ssl_connect_data * connssl,CURLINFO info UNUSED_PARAM)890 static void *Curl_polarssl_get_internals(struct ssl_connect_data *connssl,
891 CURLINFO info UNUSED_PARAM)
892 {
893 (void)info;
894 return &BACKEND->ssl;
895 }
896
897 const struct Curl_ssl Curl_ssl_polarssl = {
898 { CURLSSLBACKEND_POLARSSL, "polarssl" }, /* info */
899
900 SSLSUPP_CA_PATH |
901 SSLSUPP_PINNEDPUBKEY,
902
903 sizeof(struct ssl_backend_data),
904
905 Curl_polarssl_init, /* init */
906 Curl_polarssl_cleanup, /* cleanup */
907 Curl_polarssl_version, /* version */
908 Curl_none_check_cxn, /* check_cxn */
909 Curl_none_shutdown, /* shutdown */
910 Curl_polarssl_data_pending, /* data_pending */
911 /* This might cause libcurl to use a weeker random!
912 * TODO: use Polarssl's CTR-DRBG or HMAC-DRBG
913 */
914 Curl_none_random, /* random */
915 Curl_none_cert_status_request, /* cert_status_request */
916 Curl_polarssl_connect, /* connect */
917 Curl_polarssl_connect_nonblocking, /* connect_nonblocking */
918 Curl_polarssl_get_internals, /* get_internals */
919 Curl_polarssl_close, /* close_one */
920 Curl_none_close_all, /* close_all */
921 Curl_polarssl_session_free, /* session_free */
922 Curl_none_set_engine, /* set_engine */
923 Curl_none_set_engine_default, /* set_engine_default */
924 Curl_none_engines_list, /* engines_list */
925 Curl_none_false_start, /* false_start */
926 Curl_none_md5sum, /* md5sum */
927 Curl_polarssl_sha256sum /* sha256sum */
928 };
929
930 #endif /* USE_POLARSSL */
931