1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2012 - 2016, 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
34 #include <polarssl/net.h>
35 #include <polarssl/ssl.h>
36 #include <polarssl/certs.h>
37 #include <polarssl/x509.h>
38 #include <polarssl/version.h>
39 #include <polarssl/sha256.h>
40
41 #if POLARSSL_VERSION_NUMBER < 0x01030000
42 #error too old PolarSSL
43 #endif
44
45 #include <polarssl/error.h>
46 #include <polarssl/entropy.h>
47 #include <polarssl/ctr_drbg.h>
48
49 #include "urldata.h"
50 #include "sendf.h"
51 #include "inet_pton.h"
52 #include "polarssl.h"
53 #include "vtls.h"
54 #include "parsedate.h"
55 #include "connect.h" /* for the connect timeout */
56 #include "select.h"
57 #include "strcase.h"
58 #include "polarssl_threadlock.h"
59 #include "curl_printf.h"
60 #include "curl_memory.h"
61 /* The last #include file should be: */
62 #include "memdebug.h"
63
64 /* See https://tls.mbed.org/discussions/generic/
65 howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
66 */
67 #define RSA_PUB_DER_MAX_BYTES (38 + 2 * POLARSSL_MPI_MAX_SIZE)
68 #define ECP_PUB_DER_MAX_BYTES (30 + 2 * POLARSSL_ECP_MAX_BYTES)
69
70 #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
71 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
72
73 /* apply threading? */
74 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
75 #define THREADING_SUPPORT
76 #endif
77
78 #ifndef POLARSSL_ERROR_C
79 #define error_strerror(x,y,z)
80 #endif /* POLARSSL_ERROR_C */
81
82
83 #if defined(THREADING_SUPPORT)
84 static entropy_context entropy;
85
86 static int entropy_init_initialized = 0;
87
88 /* start of entropy_init_mutex() */
entropy_init_mutex(entropy_context * ctx)89 static void entropy_init_mutex(entropy_context *ctx)
90 {
91 /* lock 0 = entropy_init_mutex() */
92 Curl_polarsslthreadlock_lock_function(0);
93 if(entropy_init_initialized == 0) {
94 entropy_init(ctx);
95 entropy_init_initialized = 1;
96 }
97 Curl_polarsslthreadlock_unlock_function(0);
98 }
99 /* end of entropy_init_mutex() */
100
101 /* start of entropy_func_mutex() */
entropy_func_mutex(void * data,unsigned char * output,size_t len)102 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
103 {
104 int ret;
105 /* lock 1 = entropy_func_mutex() */
106 Curl_polarsslthreadlock_lock_function(1);
107 ret = entropy_func(data, output, len);
108 Curl_polarsslthreadlock_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 PolarSSL */
117 #undef POLARSSL_DEBUG
118
119 #ifdef POLARSSL_DEBUG
polarssl_debug(void * context,int level,const char * line)120 static void polarssl_debug(void *context, int level, const char *line)
121 {
122 struct Curl_easy *data = NULL;
123
124 if(!context)
125 return;
126
127 data = (struct Curl_easy *)context;
128
129 infof(data, "%s", line);
130 (void) level;
131 }
132 #else
133 #endif
134
135 /* ALPN for http2? */
136 #ifdef POLARSSL_SSL_ALPN
137 # define HAS_ALPN
138 #endif
139
140 static Curl_recv polarssl_recv;
141 static Curl_send polarssl_send;
142
143
144 static CURLcode
polarssl_connect_step1(struct connectdata * conn,int sockindex)145 polarssl_connect_step1(struct connectdata *conn,
146 int sockindex)
147 {
148 struct Curl_easy *data = conn->data;
149 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
150 const char *capath = SSL_CONN_CONFIG(CApath);
151 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
152 conn->host.name;
153 const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
154 int ret = -1;
155 char errorbuf[128];
156 errorbuf[0]=0;
157
158 /* PolarSSL only supports SSLv3 and TLSv1 */
159 if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
160 failf(data, "PolarSSL does not support SSLv2");
161 return CURLE_SSL_CONNECT_ERROR;
162 }
163
164 #ifdef THREADING_SUPPORT
165 entropy_init_mutex(&entropy);
166
167 if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func_mutex, &entropy,
168 NULL, 0)) != 0) {
169 error_strerror(ret, errorbuf, sizeof(errorbuf));
170 failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
171 -ret, errorbuf);
172 }
173 #else
174 entropy_init(&connssl->entropy);
175
176 if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func, &connssl->entropy,
177 NULL, 0)) != 0) {
178 error_strerror(ret, errorbuf, sizeof(errorbuf));
179 failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
180 -ret, errorbuf);
181 }
182 #endif /* THREADING_SUPPORT */
183
184 /* Load the trusted CA */
185 memset(&connssl->cacert, 0, sizeof(x509_crt));
186
187 if(SSL_CONN_CONFIG(CAfile)) {
188 ret = x509_crt_parse_file(&connssl->cacert,
189 SSL_CONN_CONFIG(CAfile));
190
191 if(ret<0) {
192 error_strerror(ret, errorbuf, sizeof(errorbuf));
193 failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s",
194 SSL_CONN_CONFIG(CAfile), -ret, errorbuf);
195
196 if(SSL_CONN_CONFIG(verifypeer))
197 return CURLE_SSL_CACERT_BADFILE;
198 }
199 }
200
201 if(capath) {
202 ret = x509_crt_parse_path(&connssl->cacert, capath);
203
204 if(ret<0) {
205 error_strerror(ret, errorbuf, sizeof(errorbuf));
206 failf(data, "Error reading ca cert path %s - PolarSSL: (-0x%04X) %s",
207 capath, -ret, errorbuf);
208
209 if(SSL_CONN_CONFIG(verifypeer))
210 return CURLE_SSL_CACERT_BADFILE;
211 }
212 }
213
214 /* Load the client certificate */
215 memset(&connssl->clicert, 0, sizeof(x509_crt));
216
217 if(SSL_SET_OPTION(cert)) {
218 ret = x509_crt_parse_file(&connssl->clicert,
219 SSL_SET_OPTION(cert));
220
221 if(ret) {
222 error_strerror(ret, errorbuf, sizeof(errorbuf));
223 failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
224 SSL_SET_OPTION(cert), -ret, errorbuf);
225
226 return CURLE_SSL_CERTPROBLEM;
227 }
228 }
229
230 /* Load the client private key */
231 if(SSL_SET_OPTION(key)) {
232 pk_context pk;
233 pk_init(&pk);
234 ret = pk_parse_keyfile(&pk, SSL_SET_OPTION(key),
235 SSL_SET_OPTION(key_passwd));
236 if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA))
237 ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
238 if(ret == 0)
239 rsa_copy(&connssl->rsa, pk_rsa(pk));
240 else
241 rsa_free(&connssl->rsa);
242 pk_free(&pk);
243
244 if(ret) {
245 error_strerror(ret, errorbuf, sizeof(errorbuf));
246 failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
247 SSL_SET_OPTION(key), -ret, errorbuf);
248
249 return CURLE_SSL_CERTPROBLEM;
250 }
251 }
252
253 /* Load the CRL */
254 memset(&connssl->crl, 0, sizeof(x509_crl));
255
256 if(SSL_SET_OPTION(CRLfile)) {
257 ret = x509_crl_parse_file(&connssl->crl,
258 SSL_SET_OPTION(CRLfile));
259
260 if(ret) {
261 error_strerror(ret, errorbuf, sizeof(errorbuf));
262 failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
263 SSL_SET_OPTION(CRLfile), -ret, errorbuf);
264
265 return CURLE_SSL_CRL_BADFILE;
266 }
267 }
268
269 infof(data, "PolarSSL: Connecting to %s:%d\n", hostname, port);
270
271 if(ssl_init(&connssl->ssl)) {
272 failf(data, "PolarSSL: ssl_init failed");
273 return CURLE_SSL_CONNECT_ERROR;
274 }
275
276 switch(SSL_CONN_CONFIG(version)) {
277 case CURL_SSLVERSION_DEFAULT:
278 case CURL_SSLVERSION_TLSv1:
279 ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
280 SSL_MINOR_VERSION_1);
281 break;
282 case CURL_SSLVERSION_SSLv3:
283 ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
284 SSL_MINOR_VERSION_0);
285 ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
286 SSL_MINOR_VERSION_0);
287 infof(data, "PolarSSL: Forced min. SSL Version to be SSLv3\n");
288 break;
289 case CURL_SSLVERSION_TLSv1_0:
290 ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
291 SSL_MINOR_VERSION_1);
292 ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
293 SSL_MINOR_VERSION_1);
294 infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.0\n");
295 break;
296 case CURL_SSLVERSION_TLSv1_1:
297 ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
298 SSL_MINOR_VERSION_2);
299 ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
300 SSL_MINOR_VERSION_2);
301 infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.1\n");
302 break;
303 case CURL_SSLVERSION_TLSv1_2:
304 ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
305 SSL_MINOR_VERSION_3);
306 ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
307 SSL_MINOR_VERSION_3);
308 infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.2\n");
309 break;
310 case CURL_SSLVERSION_TLSv1_3:
311 failf(data, "PolarSSL: TLS 1.3 is not yet supported");
312 return CURLE_SSL_CONNECT_ERROR;
313 default:
314 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
315 return CURLE_SSL_CONNECT_ERROR;
316 }
317
318 ssl_set_endpoint(&connssl->ssl, SSL_IS_CLIENT);
319 ssl_set_authmode(&connssl->ssl, SSL_VERIFY_OPTIONAL);
320
321 ssl_set_rng(&connssl->ssl, ctr_drbg_random,
322 &connssl->ctr_drbg);
323 ssl_set_bio(&connssl->ssl,
324 net_recv, &conn->sock[sockindex],
325 net_send, &conn->sock[sockindex]);
326
327 ssl_set_ciphersuites(&connssl->ssl, ssl_list_ciphersuites());
328
329 /* Check if there's a cached ID we can/should use here! */
330 if(data->set.general_ssl.sessionid) {
331 void *old_session = NULL;
332
333 Curl_ssl_sessionid_lock(conn);
334 if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
335 ret = ssl_set_session(&connssl->ssl, old_session);
336 if(ret) {
337 Curl_ssl_sessionid_unlock(conn);
338 failf(data, "ssl_set_session returned -0x%x", -ret);
339 return CURLE_SSL_CONNECT_ERROR;
340 }
341 infof(data, "PolarSSL re-using session\n");
342 }
343 Curl_ssl_sessionid_unlock(conn);
344 }
345
346 ssl_set_ca_chain(&connssl->ssl,
347 &connssl->cacert,
348 &connssl->crl,
349 hostname);
350
351 ssl_set_own_cert_rsa(&connssl->ssl,
352 &connssl->clicert, &connssl->rsa);
353
354 if(ssl_set_hostname(&connssl->ssl, hostname)) {
355 /* ssl_set_hostname() sets the name to use in CN/SAN checks *and* the name
356 to set in the SNI extension. So even if curl connects to a host
357 specified as an IP address, this function must be used. */
358 failf(data, "couldn't set hostname in PolarSSL");
359 return CURLE_SSL_CONNECT_ERROR;
360 }
361
362 #ifdef HAS_ALPN
363 if(conn->bits.tls_enable_alpn) {
364 static const char *protocols[3];
365 int cur = 0;
366
367 #ifdef USE_NGHTTP2
368 if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
369 protocols[cur++] = NGHTTP2_PROTO_VERSION_ID;
370 infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
371 }
372 #endif
373
374 protocols[cur++] = ALPN_HTTP_1_1;
375 infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1);
376
377 protocols[cur] = NULL;
378
379 ssl_set_alpn_protocols(&connssl->ssl, protocols);
380 }
381 #endif
382
383 #ifdef POLARSSL_DEBUG
384 ssl_set_dbg(&connssl->ssl, polarssl_debug, data);
385 #endif
386
387 connssl->connecting_state = ssl_connect_2;
388
389 return CURLE_OK;
390 }
391
392 static CURLcode
polarssl_connect_step2(struct connectdata * conn,int sockindex)393 polarssl_connect_step2(struct connectdata *conn,
394 int sockindex)
395 {
396 int ret;
397 struct Curl_easy *data = conn->data;
398 struct ssl_connect_data* connssl = &conn->ssl[sockindex];
399 char buffer[1024];
400
401 char errorbuf[128];
402 errorbuf[0] = 0;
403
404 conn->recv[sockindex] = polarssl_recv;
405 conn->send[sockindex] = polarssl_send;
406
407 ret = ssl_handshake(&connssl->ssl);
408
409 switch(ret) {
410 case 0:
411 break;
412
413 case POLARSSL_ERR_NET_WANT_READ:
414 connssl->connecting_state = ssl_connect_2_reading;
415 return CURLE_OK;
416
417 case POLARSSL_ERR_NET_WANT_WRITE:
418 connssl->connecting_state = ssl_connect_2_writing;
419 return CURLE_OK;
420
421 default:
422 error_strerror(ret, errorbuf, sizeof(errorbuf));
423 failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
424 -ret, errorbuf);
425 return CURLE_SSL_CONNECT_ERROR;
426 }
427
428 infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
429 ssl_get_ciphersuite(&conn->ssl[sockindex].ssl) );
430
431 ret = ssl_get_verify_result(&conn->ssl[sockindex].ssl);
432
433 if(ret && SSL_CONN_CONFIG(verifypeer)) {
434 if(ret & BADCERT_EXPIRED)
435 failf(data, "Cert verify failed: BADCERT_EXPIRED");
436
437 if(ret & BADCERT_REVOKED) {
438 failf(data, "Cert verify failed: BADCERT_REVOKED");
439 return CURLE_SSL_CACERT;
440 }
441
442 if(ret & BADCERT_CN_MISMATCH)
443 failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
444
445 if(ret & BADCERT_NOT_TRUSTED)
446 failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
447
448 return CURLE_PEER_FAILED_VERIFICATION;
449 }
450
451 if(ssl_get_peer_cert(&(connssl->ssl))) {
452 /* If the session was resumed, there will be no peer certs */
453 memset(buffer, 0, sizeof(buffer));
454
455 if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ",
456 ssl_get_peer_cert(&(connssl->ssl))) != -1)
457 infof(data, "Dumping cert info:\n%s\n", buffer);
458 }
459
460 /* adapted from mbedtls.c */
461 if(data->set.str[STRING_SSL_PINNEDPUBLICKEY]) {
462 int size;
463 CURLcode result;
464 x509_crt *p;
465 unsigned char pubkey[PUB_DER_MAX_BYTES];
466 const x509_crt *peercert;
467
468 peercert = ssl_get_peer_cert(&connssl->ssl);
469
470 if(!peercert || !peercert->raw.p || !peercert->raw.len) {
471 failf(data, "Failed due to missing peer certificate");
472 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
473 }
474
475 p = calloc(1, sizeof(*p));
476
477 if(!p)
478 return CURLE_OUT_OF_MEMORY;
479
480 x509_crt_init(p);
481
482 /* Make a copy of our const peercert because pk_write_pubkey_der
483 needs a non-const key, for now.
484 https://github.com/ARMmbed/mbedtls/issues/396 */
485 if(x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
486 failf(data, "Failed copying peer certificate");
487 x509_crt_free(p);
488 free(p);
489 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
490 }
491
492 size = pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
493
494 if(size <= 0) {
495 failf(data, "Failed copying public key from peer certificate");
496 x509_crt_free(p);
497 free(p);
498 return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
499 }
500
501 /* pk_write_pubkey_der writes data at the end of the buffer. */
502 result = Curl_pin_peer_pubkey(data,
503 data->set.str[STRING_SSL_PINNEDPUBLICKEY],
504 &pubkey[PUB_DER_MAX_BYTES - size], size);
505 if(result) {
506 x509_crt_free(p);
507 free(p);
508 return result;
509 }
510
511 x509_crt_free(p);
512 free(p);
513 }
514
515 #ifdef HAS_ALPN
516 if(conn->bits.tls_enable_alpn) {
517 const char *next_protocol = ssl_get_alpn_protocol(&connssl->ssl);
518
519 if(next_protocol != NULL) {
520 infof(data, "ALPN, server accepted to use %s\n", next_protocol);
521
522 #ifdef USE_NGHTTP2
523 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
524 NGHTTP2_PROTO_VERSION_ID_LEN)) {
525 conn->negnpn = CURL_HTTP_VERSION_2;
526 }
527 else
528 #endif
529 if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) {
530 conn->negnpn = CURL_HTTP_VERSION_1_1;
531 }
532 }
533 else
534 infof(data, "ALPN, server did not agree to a protocol\n");
535 }
536 #endif
537
538 connssl->connecting_state = ssl_connect_3;
539 infof(data, "SSL connected\n");
540
541 return CURLE_OK;
542 }
543
544 static CURLcode
polarssl_connect_step3(struct connectdata * conn,int sockindex)545 polarssl_connect_step3(struct connectdata *conn,
546 int sockindex)
547 {
548 CURLcode retcode = CURLE_OK;
549 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
550 struct Curl_easy *data = conn->data;
551
552 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
553
554 if(data->set.general_ssl.sessionid) {
555 int ret;
556 ssl_session *our_ssl_sessionid;
557 void *old_ssl_sessionid = NULL;
558
559 our_ssl_sessionid = malloc(sizeof(ssl_session));
560 if(!our_ssl_sessionid)
561 return CURLE_OUT_OF_MEMORY;
562
563 ssl_session_init(our_ssl_sessionid);
564
565 ret = ssl_get_session(&connssl->ssl, our_ssl_sessionid);
566 if(ret) {
567 failf(data, "ssl_get_session returned -0x%x", -ret);
568 return CURLE_SSL_CONNECT_ERROR;
569 }
570
571 /* If there's already a matching session in the cache, delete it */
572 Curl_ssl_sessionid_lock(conn);
573 if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
574 Curl_ssl_delsessionid(conn, old_ssl_sessionid);
575
576 retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
577 Curl_ssl_sessionid_unlock(conn);
578 if(retcode) {
579 free(our_ssl_sessionid);
580 failf(data, "failed to store ssl session");
581 return retcode;
582 }
583 }
584
585 connssl->connecting_state = ssl_connect_done;
586
587 return CURLE_OK;
588 }
589
polarssl_send(struct connectdata * conn,int sockindex,const void * mem,size_t len,CURLcode * curlcode)590 static ssize_t polarssl_send(struct connectdata *conn,
591 int sockindex,
592 const void *mem,
593 size_t len,
594 CURLcode *curlcode)
595 {
596 int ret = -1;
597
598 ret = ssl_write(&conn->ssl[sockindex].ssl,
599 (unsigned char *)mem, len);
600
601 if(ret < 0) {
602 *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
603 CURLE_AGAIN : CURLE_SEND_ERROR;
604 ret = -1;
605 }
606
607 return ret;
608 }
609
Curl_polarssl_close(struct connectdata * conn,int sockindex)610 void Curl_polarssl_close(struct connectdata *conn, int sockindex)
611 {
612 rsa_free(&conn->ssl[sockindex].rsa);
613 x509_crt_free(&conn->ssl[sockindex].clicert);
614 x509_crt_free(&conn->ssl[sockindex].cacert);
615 x509_crl_free(&conn->ssl[sockindex].crl);
616 ssl_free(&conn->ssl[sockindex].ssl);
617 }
618
polarssl_recv(struct connectdata * conn,int num,char * buf,size_t buffersize,CURLcode * curlcode)619 static ssize_t polarssl_recv(struct connectdata *conn,
620 int num,
621 char *buf,
622 size_t buffersize,
623 CURLcode *curlcode)
624 {
625 int ret = -1;
626 ssize_t len = -1;
627
628 memset(buf, 0, buffersize);
629 ret = ssl_read(&conn->ssl[num].ssl, (unsigned char *)buf, buffersize);
630
631 if(ret <= 0) {
632 if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
633 return 0;
634
635 *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
636 CURLE_AGAIN : CURLE_RECV_ERROR;
637 return -1;
638 }
639
640 len = ret;
641
642 return len;
643 }
644
Curl_polarssl_session_free(void * ptr)645 void Curl_polarssl_session_free(void *ptr)
646 {
647 ssl_session_free(ptr);
648 free(ptr);
649 }
650
651 /* 1.3.10 was the first rebranded version. All new releases (in 1.3 branch and
652 higher) will be mbed TLS branded.. */
653
Curl_polarssl_version(char * buffer,size_t size)654 size_t Curl_polarssl_version(char *buffer, size_t size)
655 {
656 unsigned int version = version_get_number();
657 return snprintf(buffer, size, "%s/%d.%d.%d",
658 version >= 0x01030A00?"mbedTLS":"PolarSSL",
659 version>>24, (version>>16)&0xff, (version>>8)&0xff);
660 }
661
662 static CURLcode
polarssl_connect_common(struct connectdata * conn,int sockindex,bool nonblocking,bool * done)663 polarssl_connect_common(struct connectdata *conn,
664 int sockindex,
665 bool nonblocking,
666 bool *done)
667 {
668 CURLcode result;
669 struct Curl_easy *data = conn->data;
670 struct ssl_connect_data *connssl = &conn->ssl[sockindex];
671 curl_socket_t sockfd = conn->sock[sockindex];
672 long timeout_ms;
673 int what;
674
675 /* check if the connection has already been established */
676 if(ssl_connection_complete == connssl->state) {
677 *done = TRUE;
678 return CURLE_OK;
679 }
680
681 if(ssl_connect_1 == connssl->connecting_state) {
682 /* Find out how much more time we're allowed */
683 timeout_ms = Curl_timeleft(data, NULL, TRUE);
684
685 if(timeout_ms < 0) {
686 /* no need to continue if time already is up */
687 failf(data, "SSL connection timeout");
688 return CURLE_OPERATION_TIMEDOUT;
689 }
690
691 result = polarssl_connect_step1(conn, sockindex);
692 if(result)
693 return result;
694 }
695
696 while(ssl_connect_2 == connssl->connecting_state ||
697 ssl_connect_2_reading == connssl->connecting_state ||
698 ssl_connect_2_writing == connssl->connecting_state) {
699
700 /* check allowed time left */
701 timeout_ms = Curl_timeleft(data, NULL, TRUE);
702
703 if(timeout_ms < 0) {
704 /* no need to continue if time already is up */
705 failf(data, "SSL connection timeout");
706 return CURLE_OPERATION_TIMEDOUT;
707 }
708
709 /* if ssl is expecting something, check if it's available. */
710 if(connssl->connecting_state == ssl_connect_2_reading ||
711 connssl->connecting_state == ssl_connect_2_writing) {
712
713 curl_socket_t writefd = ssl_connect_2_writing==
714 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
715 curl_socket_t readfd = ssl_connect_2_reading==
716 connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
717
718 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
719 nonblocking?0:timeout_ms);
720 if(what < 0) {
721 /* fatal error */
722 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
723 return CURLE_SSL_CONNECT_ERROR;
724 }
725 else if(0 == what) {
726 if(nonblocking) {
727 *done = FALSE;
728 return CURLE_OK;
729 }
730 else {
731 /* timeout */
732 failf(data, "SSL connection timeout");
733 return CURLE_OPERATION_TIMEDOUT;
734 }
735 }
736 /* socket is readable or writable */
737 }
738
739 /* Run transaction, and return to the caller if it failed or if
740 * this connection is part of a multi handle and this loop would
741 * execute again. This permits the owner of a multi handle to
742 * abort a connection attempt before step2 has completed while
743 * ensuring that a client using select() or epoll() will always
744 * have a valid fdset to wait on.
745 */
746 result = polarssl_connect_step2(conn, sockindex);
747 if(result || (nonblocking &&
748 (ssl_connect_2 == connssl->connecting_state ||
749 ssl_connect_2_reading == connssl->connecting_state ||
750 ssl_connect_2_writing == connssl->connecting_state)))
751 return result;
752
753 } /* repeat step2 until all transactions are done. */
754
755 if(ssl_connect_3 == connssl->connecting_state) {
756 result = polarssl_connect_step3(conn, sockindex);
757 if(result)
758 return result;
759 }
760
761 if(ssl_connect_done == connssl->connecting_state) {
762 connssl->state = ssl_connection_complete;
763 conn->recv[sockindex] = polarssl_recv;
764 conn->send[sockindex] = polarssl_send;
765 *done = TRUE;
766 }
767 else
768 *done = FALSE;
769
770 /* Reset our connect state machine */
771 connssl->connecting_state = ssl_connect_1;
772
773 return CURLE_OK;
774 }
775
776 CURLcode
Curl_polarssl_connect_nonblocking(struct connectdata * conn,int sockindex,bool * done)777 Curl_polarssl_connect_nonblocking(struct connectdata *conn,
778 int sockindex,
779 bool *done)
780 {
781 return polarssl_connect_common(conn, sockindex, TRUE, done);
782 }
783
784
785 CURLcode
Curl_polarssl_connect(struct connectdata * conn,int sockindex)786 Curl_polarssl_connect(struct connectdata *conn,
787 int sockindex)
788 {
789 CURLcode result;
790 bool done = FALSE;
791
792 result = polarssl_connect_common(conn, sockindex, FALSE, &done);
793 if(result)
794 return result;
795
796 DEBUGASSERT(done);
797
798 return CURLE_OK;
799 }
800
801 /*
802 * return 0 error initializing SSL
803 * return 1 SSL initialized successfully
804 */
Curl_polarssl_init(void)805 int Curl_polarssl_init(void)
806 {
807 return Curl_polarsslthreadlock_thread_setup();
808 }
809
Curl_polarssl_cleanup(void)810 void Curl_polarssl_cleanup(void)
811 {
812 (void)Curl_polarsslthreadlock_thread_cleanup();
813 }
814
815 #endif /* USE_POLARSSL */
816