1 /* ssl/t1_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112 #include <stdio.h>
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include <openssl/ocsp.h>
117 #include "ssl_locl.h"
118
119 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
120
121 #ifndef OPENSSL_NO_TLSEXT
122 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
123 const unsigned char *sess_id, int sesslen,
124 SSL_SESSION **psess);
125 #endif
126
127 SSL3_ENC_METHOD TLSv1_enc_data={
128 tls1_enc,
129 tls1_mac,
130 tls1_setup_key_block,
131 tls1_generate_master_secret,
132 tls1_change_cipher_state,
133 tls1_final_finish_mac,
134 TLS1_FINISH_MAC_LENGTH,
135 tls1_cert_verify_mac,
136 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
137 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
138 tls1_alert_code,
139 };
140
tls1_default_timeout(void)141 long tls1_default_timeout(void)
142 {
143 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
144 * is way too long for http, the cache would over fill */
145 return(60*60*2);
146 }
147
tls1_new(SSL * s)148 int tls1_new(SSL *s)
149 {
150 if (!ssl3_new(s)) return(0);
151 s->method->ssl_clear(s);
152 return(1);
153 }
154
tls1_free(SSL * s)155 void tls1_free(SSL *s)
156 {
157 #ifndef OPENSSL_NO_TLSEXT
158 if (s->tlsext_session_ticket)
159 {
160 OPENSSL_free(s->tlsext_session_ticket);
161 }
162 #endif /* OPENSSL_NO_TLSEXT */
163 ssl3_free(s);
164 }
165
tls1_clear(SSL * s)166 void tls1_clear(SSL *s)
167 {
168 ssl3_clear(s);
169 s->version=TLS1_VERSION;
170 }
171
172 #ifndef OPENSSL_NO_EC
173 static int nid_list[] =
174 {
175 NID_sect163k1, /* sect163k1 (1) */
176 NID_sect163r1, /* sect163r1 (2) */
177 NID_sect163r2, /* sect163r2 (3) */
178 NID_sect193r1, /* sect193r1 (4) */
179 NID_sect193r2, /* sect193r2 (5) */
180 NID_sect233k1, /* sect233k1 (6) */
181 NID_sect233r1, /* sect233r1 (7) */
182 NID_sect239k1, /* sect239k1 (8) */
183 NID_sect283k1, /* sect283k1 (9) */
184 NID_sect283r1, /* sect283r1 (10) */
185 NID_sect409k1, /* sect409k1 (11) */
186 NID_sect409r1, /* sect409r1 (12) */
187 NID_sect571k1, /* sect571k1 (13) */
188 NID_sect571r1, /* sect571r1 (14) */
189 NID_secp160k1, /* secp160k1 (15) */
190 NID_secp160r1, /* secp160r1 (16) */
191 NID_secp160r2, /* secp160r2 (17) */
192 NID_secp192k1, /* secp192k1 (18) */
193 NID_X9_62_prime192v1, /* secp192r1 (19) */
194 NID_secp224k1, /* secp224k1 (20) */
195 NID_secp224r1, /* secp224r1 (21) */
196 NID_secp256k1, /* secp256k1 (22) */
197 NID_X9_62_prime256v1, /* secp256r1 (23) */
198 NID_secp384r1, /* secp384r1 (24) */
199 NID_secp521r1 /* secp521r1 (25) */
200 };
201
tls1_ec_curve_id2nid(int curve_id)202 int tls1_ec_curve_id2nid(int curve_id)
203 {
204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
205 if ((curve_id < 1) || ((unsigned int)curve_id >
206 sizeof(nid_list)/sizeof(nid_list[0])))
207 return 0;
208 return nid_list[curve_id-1];
209 }
210
tls1_ec_nid2curve_id(int nid)211 int tls1_ec_nid2curve_id(int nid)
212 {
213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
214 switch (nid)
215 {
216 case NID_sect163k1: /* sect163k1 (1) */
217 return 1;
218 case NID_sect163r1: /* sect163r1 (2) */
219 return 2;
220 case NID_sect163r2: /* sect163r2 (3) */
221 return 3;
222 case NID_sect193r1: /* sect193r1 (4) */
223 return 4;
224 case NID_sect193r2: /* sect193r2 (5) */
225 return 5;
226 case NID_sect233k1: /* sect233k1 (6) */
227 return 6;
228 case NID_sect233r1: /* sect233r1 (7) */
229 return 7;
230 case NID_sect239k1: /* sect239k1 (8) */
231 return 8;
232 case NID_sect283k1: /* sect283k1 (9) */
233 return 9;
234 case NID_sect283r1: /* sect283r1 (10) */
235 return 10;
236 case NID_sect409k1: /* sect409k1 (11) */
237 return 11;
238 case NID_sect409r1: /* sect409r1 (12) */
239 return 12;
240 case NID_sect571k1: /* sect571k1 (13) */
241 return 13;
242 case NID_sect571r1: /* sect571r1 (14) */
243 return 14;
244 case NID_secp160k1: /* secp160k1 (15) */
245 return 15;
246 case NID_secp160r1: /* secp160r1 (16) */
247 return 16;
248 case NID_secp160r2: /* secp160r2 (17) */
249 return 17;
250 case NID_secp192k1: /* secp192k1 (18) */
251 return 18;
252 case NID_X9_62_prime192v1: /* secp192r1 (19) */
253 return 19;
254 case NID_secp224k1: /* secp224k1 (20) */
255 return 20;
256 case NID_secp224r1: /* secp224r1 (21) */
257 return 21;
258 case NID_secp256k1: /* secp256k1 (22) */
259 return 22;
260 case NID_X9_62_prime256v1: /* secp256r1 (23) */
261 return 23;
262 case NID_secp384r1: /* secp384r1 (24) */
263 return 24;
264 case NID_secp521r1: /* secp521r1 (25) */
265 return 25;
266 default:
267 return 0;
268 }
269 }
270 #endif /* OPENSSL_NO_EC */
271
272 #ifndef OPENSSL_NO_TLSEXT
ssl_add_clienthello_tlsext(SSL * s,unsigned char * p,unsigned char * limit)273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
274 {
275 int extdatalen=0;
276 unsigned char *ret = p;
277
278 /* don't add extensions for SSLv3 unless doing secure renegotiation */
279 if (s->client_version == SSL3_VERSION
280 && !s->s3->send_connection_binding)
281 return p;
282
283 ret+=2;
284
285 if (ret>=limit) return NULL; /* this really never occurs, but ... */
286
287 if (s->tlsext_hostname != NULL)
288 {
289 /* Add TLS extension servername to the Client Hello message */
290 unsigned long size_str;
291 long lenmax;
292
293 /* check for enough space.
294 4 for the servername type and entension length
295 2 for servernamelist length
296 1 for the hostname type
297 2 for hostname length
298 + hostname length
299 */
300
301 if ((lenmax = limit - ret - 9) < 0
302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
303 return NULL;
304
305 /* extension type and length */
306 s2n(TLSEXT_TYPE_server_name,ret);
307 s2n(size_str+5,ret);
308
309 /* length of servername list */
310 s2n(size_str+3,ret);
311
312 /* hostname type, length and hostname */
313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
314 s2n(size_str,ret);
315 memcpy(ret, s->tlsext_hostname, size_str);
316 ret+=size_str;
317 }
318
319 /* Add RI if renegotiating */
320 if (s->new_session)
321 {
322 int el;
323
324 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
325 {
326 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
327 return NULL;
328 }
329
330 if((limit - p - 4 - el) < 0) return NULL;
331
332 s2n(TLSEXT_TYPE_renegotiate,ret);
333 s2n(el,ret);
334
335 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
336 {
337 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
338 return NULL;
339 }
340
341 ret += el;
342 }
343
344 #ifndef OPENSSL_NO_EC
345 if (s->tlsext_ecpointformatlist != NULL &&
346 s->version != DTLS1_VERSION)
347 {
348 /* Add TLS extension ECPointFormats to the ClientHello message */
349 long lenmax;
350
351 if ((lenmax = limit - ret - 5) < 0) return NULL;
352 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
353 if (s->tlsext_ecpointformatlist_length > 255)
354 {
355 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
356 return NULL;
357 }
358
359 s2n(TLSEXT_TYPE_ec_point_formats,ret);
360 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
361 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
362 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
363 ret+=s->tlsext_ecpointformatlist_length;
364 }
365 if (s->tlsext_ellipticcurvelist != NULL &&
366 s->version != DTLS1_VERSION)
367 {
368 /* Add TLS extension EllipticCurves to the ClientHello message */
369 long lenmax;
370
371 if ((lenmax = limit - ret - 6) < 0) return NULL;
372 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
373 if (s->tlsext_ellipticcurvelist_length > 65532)
374 {
375 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
376 return NULL;
377 }
378
379 s2n(TLSEXT_TYPE_elliptic_curves,ret);
380 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
381
382 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
383 * elliptic_curve_list, but the examples use two bytes.
384 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
385 * resolves this to two bytes.
386 */
387 s2n(s->tlsext_ellipticcurvelist_length, ret);
388 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
389 ret+=s->tlsext_ellipticcurvelist_length;
390 }
391 #endif /* OPENSSL_NO_EC */
392
393 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
394 {
395 int ticklen;
396 if (!s->new_session && s->session && s->session->tlsext_tick)
397 ticklen = s->session->tlsext_ticklen;
398 else if (s->session && s->tlsext_session_ticket &&
399 s->tlsext_session_ticket->data)
400 {
401 ticklen = s->tlsext_session_ticket->length;
402 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
403 if (!s->session->tlsext_tick)
404 return NULL;
405 memcpy(s->session->tlsext_tick,
406 s->tlsext_session_ticket->data,
407 ticklen);
408 s->session->tlsext_ticklen = ticklen;
409 }
410 else
411 ticklen = 0;
412 if (ticklen == 0 && s->tlsext_session_ticket &&
413 s->tlsext_session_ticket->data == NULL)
414 goto skip_ext;
415 /* Check for enough room 2 for extension type, 2 for len
416 * rest for ticket
417 */
418 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
419 s2n(TLSEXT_TYPE_session_ticket,ret);
420 s2n(ticklen,ret);
421 if (ticklen)
422 {
423 memcpy(ret, s->session->tlsext_tick, ticklen);
424 ret += ticklen;
425 }
426 }
427 skip_ext:
428
429 #ifdef TLSEXT_TYPE_opaque_prf_input
430 if (s->s3->client_opaque_prf_input != NULL &&
431 s->version != DTLS1_VERSION)
432 {
433 size_t col = s->s3->client_opaque_prf_input_len;
434
435 if ((long)(limit - ret - 6 - col < 0))
436 return NULL;
437 if (col > 0xFFFD) /* can't happen */
438 return NULL;
439
440 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
441 s2n(col + 2, ret);
442 s2n(col, ret);
443 memcpy(ret, s->s3->client_opaque_prf_input, col);
444 ret += col;
445 }
446 #endif
447
448 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
449 s->version != DTLS1_VERSION)
450 {
451 int i;
452 long extlen, idlen, itmp;
453 OCSP_RESPID *id;
454
455 idlen = 0;
456 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
457 {
458 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
459 itmp = i2d_OCSP_RESPID(id, NULL);
460 if (itmp <= 0)
461 return NULL;
462 idlen += itmp + 2;
463 }
464
465 if (s->tlsext_ocsp_exts)
466 {
467 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
468 if (extlen < 0)
469 return NULL;
470 }
471 else
472 extlen = 0;
473
474 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
475 s2n(TLSEXT_TYPE_status_request, ret);
476 if (extlen + idlen > 0xFFF0)
477 return NULL;
478 s2n(extlen + idlen + 5, ret);
479 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
480 s2n(idlen, ret);
481 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
482 {
483 /* save position of id len */
484 unsigned char *q = ret;
485 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
486 /* skip over id len */
487 ret += 2;
488 itmp = i2d_OCSP_RESPID(id, &ret);
489 /* write id len */
490 s2n(itmp, q);
491 }
492 s2n(extlen, ret);
493 if (extlen > 0)
494 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
495 }
496
497 if ((extdatalen = ret-p-2)== 0)
498 return p;
499
500 s2n(extdatalen,p);
501 return ret;
502 }
503
ssl_add_serverhello_tlsext(SSL * s,unsigned char * p,unsigned char * limit)504 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
505 {
506 int extdatalen=0;
507 unsigned char *ret = p;
508
509 /* don't add extensions for SSLv3, unless doing secure renegotiation */
510 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
511 return p;
512
513 ret+=2;
514 if (ret>=limit) return NULL; /* this really never occurs, but ... */
515
516 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
517 {
518 if ((long)(limit - ret - 4) < 0) return NULL;
519
520 s2n(TLSEXT_TYPE_server_name,ret);
521 s2n(0,ret);
522 }
523
524 if(s->s3->send_connection_binding)
525 {
526 int el;
527
528 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
529 {
530 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
531 return NULL;
532 }
533
534 if((limit - p - 4 - el) < 0) return NULL;
535
536 s2n(TLSEXT_TYPE_renegotiate,ret);
537 s2n(el,ret);
538
539 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
540 {
541 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
542 return NULL;
543 }
544
545 ret += el;
546 }
547
548 #ifndef OPENSSL_NO_EC
549 if (s->tlsext_ecpointformatlist != NULL &&
550 s->version != DTLS1_VERSION)
551 {
552 /* Add TLS extension ECPointFormats to the ServerHello message */
553 long lenmax;
554
555 if ((lenmax = limit - ret - 5) < 0) return NULL;
556 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
557 if (s->tlsext_ecpointformatlist_length > 255)
558 {
559 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
560 return NULL;
561 }
562
563 s2n(TLSEXT_TYPE_ec_point_formats,ret);
564 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
565 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
566 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
567 ret+=s->tlsext_ecpointformatlist_length;
568
569 }
570 /* Currently the server should not respond with a SupportedCurves extension */
571 #endif /* OPENSSL_NO_EC */
572
573 if (s->tlsext_ticket_expected
574 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
575 {
576 if ((long)(limit - ret - 4) < 0) return NULL;
577 s2n(TLSEXT_TYPE_session_ticket,ret);
578 s2n(0,ret);
579 }
580
581 if (s->tlsext_status_expected)
582 {
583 if ((long)(limit - ret - 4) < 0) return NULL;
584 s2n(TLSEXT_TYPE_status_request,ret);
585 s2n(0,ret);
586 }
587
588 #ifdef TLSEXT_TYPE_opaque_prf_input
589 if (s->s3->server_opaque_prf_input != NULL &&
590 s->version != DTLS1_VERSION)
591 {
592 size_t sol = s->s3->server_opaque_prf_input_len;
593
594 if ((long)(limit - ret - 6 - sol) < 0)
595 return NULL;
596 if (sol > 0xFFFD) /* can't happen */
597 return NULL;
598
599 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
600 s2n(sol + 2, ret);
601 s2n(sol, ret);
602 memcpy(ret, s->s3->server_opaque_prf_input, sol);
603 ret += sol;
604 }
605 #endif
606 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
607 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
608 { const unsigned char cryptopro_ext[36] = {
609 0xfd, 0xe8, /*65000*/
610 0x00, 0x20, /*32 bytes length*/
611 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
612 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
613 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
614 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
615 if (limit-ret<36) return NULL;
616 memcpy(ret,cryptopro_ext,36);
617 ret+=36;
618
619 }
620
621 if ((extdatalen = ret-p-2)== 0)
622 return p;
623
624 s2n(extdatalen,p);
625 return ret;
626 }
627
ssl_parse_clienthello_tlsext(SSL * s,unsigned char ** p,unsigned char * d,int n,int * al)628 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
629 {
630 unsigned short type;
631 unsigned short size;
632 unsigned short len;
633 unsigned char *data = *p;
634 int renegotiate_seen = 0;
635
636 s->servername_done = 0;
637 s->tlsext_status_type = -1;
638
639 if (data >= (d+n-2))
640 goto ri_check;
641 n2s(data,len);
642
643 if (data > (d+n-len))
644 goto ri_check;
645
646 while (data <= (d+n-4))
647 {
648 n2s(data,type);
649 n2s(data,size);
650
651 if (data+size > (d+n))
652 goto ri_check;
653 #if 0
654 fprintf(stderr,"Received extension type %d size %d\n",type,size);
655 #endif
656 if (s->tlsext_debug_cb)
657 s->tlsext_debug_cb(s, 0, type, data, size,
658 s->tlsext_debug_arg);
659 /* The servername extension is treated as follows:
660
661 - Only the hostname type is supported with a maximum length of 255.
662 - The servername is rejected if too long or if it contains zeros,
663 in which case an fatal alert is generated.
664 - The servername field is maintained together with the session cache.
665 - When a session is resumed, the servername call back invoked in order
666 to allow the application to position itself to the right context.
667 - The servername is acknowledged if it is new for a session or when
668 it is identical to a previously used for the same session.
669 Applications can control the behaviour. They can at any time
670 set a 'desirable' servername for a new SSL object. This can be the
671 case for example with HTTPS when a Host: header field is received and
672 a renegotiation is requested. In this case, a possible servername
673 presented in the new client hello is only acknowledged if it matches
674 the value of the Host: field.
675 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
676 if they provide for changing an explicit servername context for the session,
677 i.e. when the session has been established with a servername extension.
678 - On session reconnect, the servername extension may be absent.
679
680 */
681
682 if (type == TLSEXT_TYPE_server_name)
683 {
684 unsigned char *sdata;
685 int servname_type;
686 int dsize;
687
688 if (size < 2)
689 {
690 *al = SSL_AD_DECODE_ERROR;
691 return 0;
692 }
693 n2s(data,dsize);
694 size -= 2;
695 if (dsize > size )
696 {
697 *al = SSL_AD_DECODE_ERROR;
698 return 0;
699 }
700
701 sdata = data;
702 while (dsize > 3)
703 {
704 servname_type = *(sdata++);
705 n2s(sdata,len);
706 dsize -= 3;
707
708 if (len > dsize)
709 {
710 *al = SSL_AD_DECODE_ERROR;
711 return 0;
712 }
713 if (s->servername_done == 0)
714 switch (servname_type)
715 {
716 case TLSEXT_NAMETYPE_host_name:
717 if (!s->hit)
718 {
719 if(s->session->tlsext_hostname)
720 {
721 *al = SSL_AD_DECODE_ERROR;
722 return 0;
723 }
724 if (len > TLSEXT_MAXLEN_host_name)
725 {
726 *al = TLS1_AD_UNRECOGNIZED_NAME;
727 return 0;
728 }
729 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
730 {
731 *al = TLS1_AD_INTERNAL_ERROR;
732 return 0;
733 }
734 memcpy(s->session->tlsext_hostname, sdata, len);
735 s->session->tlsext_hostname[len]='\0';
736 if (strlen(s->session->tlsext_hostname) != len) {
737 OPENSSL_free(s->session->tlsext_hostname);
738 s->session->tlsext_hostname = NULL;
739 *al = TLS1_AD_UNRECOGNIZED_NAME;
740 return 0;
741 }
742 s->servername_done = 1;
743
744 }
745 else
746 s->servername_done = s->session->tlsext_hostname
747 && strlen(s->session->tlsext_hostname) == len
748 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
749
750 break;
751
752 default:
753 break;
754 }
755
756 dsize -= len;
757 }
758 if (dsize != 0)
759 {
760 *al = SSL_AD_DECODE_ERROR;
761 return 0;
762 }
763
764 }
765
766 #ifndef OPENSSL_NO_EC
767 else if (type == TLSEXT_TYPE_ec_point_formats &&
768 s->version != DTLS1_VERSION)
769 {
770 unsigned char *sdata = data;
771 int ecpointformatlist_length = *(sdata++);
772
773 if (ecpointformatlist_length != size - 1)
774 {
775 *al = TLS1_AD_DECODE_ERROR;
776 return 0;
777 }
778 if (!s->hit)
779 {
780 if(s->session->tlsext_ecpointformatlist)
781 {
782 *al = TLS1_AD_DECODE_ERROR;
783 return 0;
784 }
785 s->session->tlsext_ecpointformatlist_length = 0;
786 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
787 {
788 *al = TLS1_AD_INTERNAL_ERROR;
789 return 0;
790 }
791 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
792 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
793 }
794 #if 0
795 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
796 sdata = s->session->tlsext_ecpointformatlist;
797 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
798 fprintf(stderr,"%i ",*(sdata++));
799 fprintf(stderr,"\n");
800 #endif
801 }
802 else if (type == TLSEXT_TYPE_elliptic_curves &&
803 s->version != DTLS1_VERSION)
804 {
805 unsigned char *sdata = data;
806 int ellipticcurvelist_length = (*(sdata++) << 8);
807 ellipticcurvelist_length += (*(sdata++));
808
809 if (ellipticcurvelist_length != size - 2)
810 {
811 *al = TLS1_AD_DECODE_ERROR;
812 return 0;
813 }
814 if (!s->hit)
815 {
816 if(s->session->tlsext_ellipticcurvelist)
817 {
818 *al = TLS1_AD_DECODE_ERROR;
819 return 0;
820 }
821 s->session->tlsext_ellipticcurvelist_length = 0;
822 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
823 {
824 *al = TLS1_AD_INTERNAL_ERROR;
825 return 0;
826 }
827 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
828 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
829 }
830 #if 0
831 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
832 sdata = s->session->tlsext_ellipticcurvelist;
833 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
834 fprintf(stderr,"%i ",*(sdata++));
835 fprintf(stderr,"\n");
836 #endif
837 }
838 #endif /* OPENSSL_NO_EC */
839 #ifdef TLSEXT_TYPE_opaque_prf_input
840 else if (type == TLSEXT_TYPE_opaque_prf_input &&
841 s->version != DTLS1_VERSION)
842 {
843 unsigned char *sdata = data;
844
845 if (size < 2)
846 {
847 *al = SSL_AD_DECODE_ERROR;
848 return 0;
849 }
850 n2s(sdata, s->s3->client_opaque_prf_input_len);
851 if (s->s3->client_opaque_prf_input_len != size - 2)
852 {
853 *al = SSL_AD_DECODE_ERROR;
854 return 0;
855 }
856
857 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
858 OPENSSL_free(s->s3->client_opaque_prf_input);
859 if (s->s3->client_opaque_prf_input_len == 0)
860 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
861 else
862 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
863 if (s->s3->client_opaque_prf_input == NULL)
864 {
865 *al = TLS1_AD_INTERNAL_ERROR;
866 return 0;
867 }
868 }
869 #endif
870 else if (type == TLSEXT_TYPE_session_ticket)
871 {
872 if (s->tls_session_ticket_ext_cb &&
873 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
874 {
875 *al = TLS1_AD_INTERNAL_ERROR;
876 return 0;
877 }
878 }
879 else if (type == TLSEXT_TYPE_renegotiate)
880 {
881 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
882 return 0;
883 renegotiate_seen = 1;
884 }
885 else if (type == TLSEXT_TYPE_status_request &&
886 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
887 {
888
889 if (size < 5)
890 {
891 *al = SSL_AD_DECODE_ERROR;
892 return 0;
893 }
894
895 s->tlsext_status_type = *data++;
896 size--;
897 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
898 {
899 const unsigned char *sdata;
900 int dsize;
901 /* Read in responder_id_list */
902 n2s(data,dsize);
903 size -= 2;
904 if (dsize > size )
905 {
906 *al = SSL_AD_DECODE_ERROR;
907 return 0;
908 }
909 while (dsize > 0)
910 {
911 OCSP_RESPID *id;
912 int idsize;
913 if (dsize < 4)
914 {
915 *al = SSL_AD_DECODE_ERROR;
916 return 0;
917 }
918 n2s(data, idsize);
919 dsize -= 2 + idsize;
920 if (dsize < 0)
921 {
922 *al = SSL_AD_DECODE_ERROR;
923 return 0;
924 }
925 sdata = data;
926 data += idsize;
927 id = d2i_OCSP_RESPID(NULL,
928 &sdata, idsize);
929 if (!id)
930 {
931 *al = SSL_AD_DECODE_ERROR;
932 return 0;
933 }
934 if (data != sdata)
935 {
936 OCSP_RESPID_free(id);
937 *al = SSL_AD_DECODE_ERROR;
938 return 0;
939 }
940 if (!s->tlsext_ocsp_ids
941 && !(s->tlsext_ocsp_ids =
942 sk_OCSP_RESPID_new_null()))
943 {
944 OCSP_RESPID_free(id);
945 *al = SSL_AD_INTERNAL_ERROR;
946 return 0;
947 }
948 if (!sk_OCSP_RESPID_push(
949 s->tlsext_ocsp_ids, id))
950 {
951 OCSP_RESPID_free(id);
952 *al = SSL_AD_INTERNAL_ERROR;
953 return 0;
954 }
955 }
956
957 /* Read in request_extensions */
958 n2s(data,dsize);
959 size -= 2;
960 if (dsize > size)
961 {
962 *al = SSL_AD_DECODE_ERROR;
963 return 0;
964 }
965 sdata = data;
966 if (dsize > 0)
967 {
968 s->tlsext_ocsp_exts =
969 d2i_X509_EXTENSIONS(NULL,
970 &sdata, dsize);
971 if (!s->tlsext_ocsp_exts
972 || (data + dsize != sdata))
973 {
974 *al = SSL_AD_DECODE_ERROR;
975 return 0;
976 }
977 }
978 }
979 /* We don't know what to do with any other type
980 * so ignore it.
981 */
982 else
983 s->tlsext_status_type = -1;
984 }
985
986 /* session ticket processed earlier */
987 data+=size;
988 }
989
990 *p = data;
991
992 ri_check:
993
994 /* Need RI if renegotiating */
995
996 if (!renegotiate_seen && s->new_session &&
997 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
998 {
999 *al = SSL_AD_HANDSHAKE_FAILURE;
1000 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
1001 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1002 return 0;
1003 }
1004
1005 return 1;
1006 }
1007
ssl_parse_serverhello_tlsext(SSL * s,unsigned char ** p,unsigned char * d,int n,int * al)1008 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1009 {
1010 unsigned short type;
1011 unsigned short size;
1012 unsigned short len;
1013 unsigned char *data = *p;
1014 int tlsext_servername = 0;
1015 int renegotiate_seen = 0;
1016
1017 if (data >= (d+n-2))
1018 goto ri_check;
1019
1020 n2s(data,len);
1021
1022 while(data <= (d+n-4))
1023 {
1024 n2s(data,type);
1025 n2s(data,size);
1026
1027 if (data+size > (d+n))
1028 goto ri_check;
1029
1030 if (s->tlsext_debug_cb)
1031 s->tlsext_debug_cb(s, 1, type, data, size,
1032 s->tlsext_debug_arg);
1033
1034 if (type == TLSEXT_TYPE_server_name)
1035 {
1036 if (s->tlsext_hostname == NULL || size > 0)
1037 {
1038 *al = TLS1_AD_UNRECOGNIZED_NAME;
1039 return 0;
1040 }
1041 tlsext_servername = 1;
1042 }
1043
1044 #ifndef OPENSSL_NO_EC
1045 else if (type == TLSEXT_TYPE_ec_point_formats &&
1046 s->version != DTLS1_VERSION)
1047 {
1048 unsigned char *sdata = data;
1049 int ecpointformatlist_length = *(sdata++);
1050
1051 if (ecpointformatlist_length != size - 1)
1052 {
1053 *al = TLS1_AD_DECODE_ERROR;
1054 return 0;
1055 }
1056 s->session->tlsext_ecpointformatlist_length = 0;
1057 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1058 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1059 {
1060 *al = TLS1_AD_INTERNAL_ERROR;
1061 return 0;
1062 }
1063 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1064 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1065 #if 0
1066 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1067 sdata = s->session->tlsext_ecpointformatlist;
1068 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1069 fprintf(stderr,"%i ",*(sdata++));
1070 fprintf(stderr,"\n");
1071 #endif
1072 }
1073 #endif /* OPENSSL_NO_EC */
1074
1075 else if (type == TLSEXT_TYPE_session_ticket)
1076 {
1077 if (s->tls_session_ticket_ext_cb &&
1078 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1079 {
1080 *al = TLS1_AD_INTERNAL_ERROR;
1081 return 0;
1082 }
1083 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1084 || (size > 0))
1085 {
1086 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1087 return 0;
1088 }
1089 s->tlsext_ticket_expected = 1;
1090 }
1091 #ifdef TLSEXT_TYPE_opaque_prf_input
1092 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1093 s->version != DTLS1_VERSION)
1094 {
1095 unsigned char *sdata = data;
1096
1097 if (size < 2)
1098 {
1099 *al = SSL_AD_DECODE_ERROR;
1100 return 0;
1101 }
1102 n2s(sdata, s->s3->server_opaque_prf_input_len);
1103 if (s->s3->server_opaque_prf_input_len != size - 2)
1104 {
1105 *al = SSL_AD_DECODE_ERROR;
1106 return 0;
1107 }
1108
1109 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1110 OPENSSL_free(s->s3->server_opaque_prf_input);
1111 if (s->s3->server_opaque_prf_input_len == 0)
1112 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1113 else
1114 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1115
1116 if (s->s3->server_opaque_prf_input == NULL)
1117 {
1118 *al = TLS1_AD_INTERNAL_ERROR;
1119 return 0;
1120 }
1121 }
1122 #endif
1123 else if (type == TLSEXT_TYPE_status_request &&
1124 s->version != DTLS1_VERSION)
1125 {
1126 /* MUST be empty and only sent if we've requested
1127 * a status request message.
1128 */
1129 if ((s->tlsext_status_type == -1) || (size > 0))
1130 {
1131 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1132 return 0;
1133 }
1134 /* Set flag to expect CertificateStatus message */
1135 s->tlsext_status_expected = 1;
1136 }
1137 else if (type == TLSEXT_TYPE_renegotiate)
1138 {
1139 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1140 return 0;
1141 renegotiate_seen = 1;
1142 }
1143 data+=size;
1144 }
1145
1146 if (data != d+n)
1147 {
1148 *al = SSL_AD_DECODE_ERROR;
1149 return 0;
1150 }
1151
1152 if (!s->hit && tlsext_servername == 1)
1153 {
1154 if (s->tlsext_hostname)
1155 {
1156 if (s->session->tlsext_hostname == NULL)
1157 {
1158 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1159 if (!s->session->tlsext_hostname)
1160 {
1161 *al = SSL_AD_UNRECOGNIZED_NAME;
1162 return 0;
1163 }
1164 }
1165 else
1166 {
1167 *al = SSL_AD_DECODE_ERROR;
1168 return 0;
1169 }
1170 }
1171 }
1172
1173 *p = data;
1174
1175 ri_check:
1176
1177 /* Determine if we need to see RI. Strictly speaking if we want to
1178 * avoid an attack we should *always* see RI even on initial server
1179 * hello because the client doesn't see any renegotiation during an
1180 * attack. However this would mean we could not connect to any server
1181 * which doesn't support RI so for the immediate future tolerate RI
1182 * absence on initial connect only.
1183 */
1184 if (!renegotiate_seen
1185 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1186 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1187 {
1188 *al = SSL_AD_HANDSHAKE_FAILURE;
1189 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1190 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1191 return 0;
1192 }
1193
1194 return 1;
1195 }
1196
1197
ssl_prepare_clienthello_tlsext(SSL * s)1198 int ssl_prepare_clienthello_tlsext(SSL *s)
1199 {
1200 #ifndef OPENSSL_NO_EC
1201 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1202 * and elliptic curves we support.
1203 */
1204 int using_ecc = 0;
1205 int i;
1206 unsigned char *j;
1207 unsigned long alg_k, alg_a;
1208 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1209
1210 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1211 {
1212 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1213
1214 alg_k = c->algorithm_mkey;
1215 alg_a = c->algorithm_auth;
1216 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1217 {
1218 using_ecc = 1;
1219 break;
1220 }
1221 }
1222 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1223 if (using_ecc)
1224 {
1225 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1226 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1227 {
1228 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1229 return -1;
1230 }
1231 s->tlsext_ecpointformatlist_length = 3;
1232 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1233 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1234 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1235
1236 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1237 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1238 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1239 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1240 {
1241 s->tlsext_ellipticcurvelist_length = 0;
1242 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1243 return -1;
1244 }
1245 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1246 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1247 s2n(i,j);
1248 }
1249 #endif /* OPENSSL_NO_EC */
1250
1251 #ifdef TLSEXT_TYPE_opaque_prf_input
1252 {
1253 int r = 1;
1254
1255 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1256 {
1257 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1258 if (!r)
1259 return -1;
1260 }
1261
1262 if (s->tlsext_opaque_prf_input != NULL)
1263 {
1264 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1265 OPENSSL_free(s->s3->client_opaque_prf_input);
1266
1267 if (s->tlsext_opaque_prf_input_len == 0)
1268 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1269 else
1270 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1271 if (s->s3->client_opaque_prf_input == NULL)
1272 {
1273 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1274 return -1;
1275 }
1276 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1277 }
1278
1279 if (r == 2)
1280 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1281 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1282 }
1283 #endif
1284
1285 return 1;
1286 }
1287
ssl_prepare_serverhello_tlsext(SSL * s)1288 int ssl_prepare_serverhello_tlsext(SSL *s)
1289 {
1290 #ifndef OPENSSL_NO_EC
1291 /* If we are server and using an ECC cipher suite, send the point formats we support
1292 * if the client sent us an ECPointsFormat extension. Note that the server is not
1293 * supposed to send an EllipticCurves extension.
1294 */
1295
1296 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1297 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1298 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1299 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1300
1301 if (using_ecc)
1302 {
1303 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1304 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1305 {
1306 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1307 return -1;
1308 }
1309 s->tlsext_ecpointformatlist_length = 3;
1310 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1311 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1312 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1313 }
1314 #endif /* OPENSSL_NO_EC */
1315
1316 return 1;
1317 }
1318
ssl_check_clienthello_tlsext(SSL * s)1319 int ssl_check_clienthello_tlsext(SSL *s)
1320 {
1321 int ret=SSL_TLSEXT_ERR_NOACK;
1322 int al = SSL_AD_UNRECOGNIZED_NAME;
1323
1324 #ifndef OPENSSL_NO_EC
1325 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1326 * ssl3_choose_cipher in s3_lib.c.
1327 */
1328 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1329 * ssl3_choose_cipher in s3_lib.c.
1330 */
1331 #endif
1332
1333 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1334 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1335 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1336 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1337
1338 /* If status request then ask callback what to do.
1339 * Note: this must be called after servername callbacks in case
1340 * the certificate has changed.
1341 */
1342 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1343 {
1344 int r;
1345 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1346 switch (r)
1347 {
1348 /* We don't want to send a status request response */
1349 case SSL_TLSEXT_ERR_NOACK:
1350 s->tlsext_status_expected = 0;
1351 break;
1352 /* status request response should be sent */
1353 case SSL_TLSEXT_ERR_OK:
1354 if (s->tlsext_ocsp_resp)
1355 s->tlsext_status_expected = 1;
1356 else
1357 s->tlsext_status_expected = 0;
1358 break;
1359 /* something bad happened */
1360 case SSL_TLSEXT_ERR_ALERT_FATAL:
1361 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1362 al = SSL_AD_INTERNAL_ERROR;
1363 goto err;
1364 }
1365 }
1366 else
1367 s->tlsext_status_expected = 0;
1368
1369 #ifdef TLSEXT_TYPE_opaque_prf_input
1370 {
1371 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1372 * but we might be sending an alert in response to the client hello,
1373 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1374
1375 int r = 1;
1376
1377 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1378 {
1379 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1380 if (!r)
1381 {
1382 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1383 al = SSL_AD_INTERNAL_ERROR;
1384 goto err;
1385 }
1386 }
1387
1388 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1389 OPENSSL_free(s->s3->server_opaque_prf_input);
1390 s->s3->server_opaque_prf_input = NULL;
1391
1392 if (s->tlsext_opaque_prf_input != NULL)
1393 {
1394 if (s->s3->client_opaque_prf_input != NULL &&
1395 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1396 {
1397 /* can only use this extension if we have a server opaque PRF input
1398 * of the same length as the client opaque PRF input! */
1399
1400 if (s->tlsext_opaque_prf_input_len == 0)
1401 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1402 else
1403 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1404 if (s->s3->server_opaque_prf_input == NULL)
1405 {
1406 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1407 al = SSL_AD_INTERNAL_ERROR;
1408 goto err;
1409 }
1410 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1411 }
1412 }
1413
1414 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1415 {
1416 /* The callback wants to enforce use of the extension,
1417 * but we can't do that with the client opaque PRF input;
1418 * abort the handshake.
1419 */
1420 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1421 al = SSL_AD_HANDSHAKE_FAILURE;
1422 }
1423 }
1424
1425 #endif
1426 err:
1427 switch (ret)
1428 {
1429 case SSL_TLSEXT_ERR_ALERT_FATAL:
1430 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1431 return -1;
1432
1433 case SSL_TLSEXT_ERR_ALERT_WARNING:
1434 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1435 return 1;
1436
1437 case SSL_TLSEXT_ERR_NOACK:
1438 s->servername_done=0;
1439 default:
1440 return 1;
1441 }
1442 }
1443
ssl_check_serverhello_tlsext(SSL * s)1444 int ssl_check_serverhello_tlsext(SSL *s)
1445 {
1446 int ret=SSL_TLSEXT_ERR_NOACK;
1447 int al = SSL_AD_UNRECOGNIZED_NAME;
1448
1449 #ifndef OPENSSL_NO_EC
1450 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1451 * must return a an EC point formats lists containing uncompressed.
1452 */
1453 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1454 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1455 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1456 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1457 {
1458 /* we are using an ECC cipher */
1459 size_t i;
1460 unsigned char *list;
1461 int found_uncompressed = 0;
1462 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1463 {
1464 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1465 return -1;
1466 }
1467 list = s->session->tlsext_ecpointformatlist;
1468 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1469 {
1470 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1471 {
1472 found_uncompressed = 1;
1473 break;
1474 }
1475 }
1476 if (!found_uncompressed)
1477 {
1478 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1479 return -1;
1480 }
1481 }
1482 ret = SSL_TLSEXT_ERR_OK;
1483 #endif /* OPENSSL_NO_EC */
1484
1485 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1486 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1487 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1488 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1489
1490 #ifdef TLSEXT_TYPE_opaque_prf_input
1491 if (s->s3->server_opaque_prf_input_len > 0)
1492 {
1493 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1494 * So first verify that we really have a value from the server too. */
1495
1496 if (s->s3->server_opaque_prf_input == NULL)
1497 {
1498 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1499 al = SSL_AD_HANDSHAKE_FAILURE;
1500 }
1501
1502 /* Anytime the server *has* sent an opaque PRF input, we need to check
1503 * that we have a client opaque PRF input of the same size. */
1504 if (s->s3->client_opaque_prf_input == NULL ||
1505 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1506 {
1507 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1508 al = SSL_AD_ILLEGAL_PARAMETER;
1509 }
1510 }
1511 #endif
1512
1513 /* If we've requested certificate status and we wont get one
1514 * tell the callback
1515 */
1516 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1517 && s->ctx && s->ctx->tlsext_status_cb)
1518 {
1519 int r;
1520 /* Set resp to NULL, resplen to -1 so callback knows
1521 * there is no response.
1522 */
1523 if (s->tlsext_ocsp_resp)
1524 {
1525 OPENSSL_free(s->tlsext_ocsp_resp);
1526 s->tlsext_ocsp_resp = NULL;
1527 }
1528 s->tlsext_ocsp_resplen = -1;
1529 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1530 if (r == 0)
1531 {
1532 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1533 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1534 }
1535 if (r < 0)
1536 {
1537 al = SSL_AD_INTERNAL_ERROR;
1538 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1539 }
1540 }
1541
1542 switch (ret)
1543 {
1544 case SSL_TLSEXT_ERR_ALERT_FATAL:
1545 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1546 return -1;
1547
1548 case SSL_TLSEXT_ERR_ALERT_WARNING:
1549 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1550 return 1;
1551
1552 case SSL_TLSEXT_ERR_NOACK:
1553 s->servername_done=0;
1554 default:
1555 return 1;
1556 }
1557 }
1558
1559 /* Since the server cache lookup is done early on in the processing of client
1560 * hello and other operations depend on the result we need to handle any TLS
1561 * session ticket extension at the same time.
1562 */
1563
tls1_process_ticket(SSL * s,unsigned char * session_id,int len,const unsigned char * limit,SSL_SESSION ** ret)1564 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1565 const unsigned char *limit, SSL_SESSION **ret)
1566 {
1567 /* Point after session ID in client hello */
1568 const unsigned char *p = session_id + len;
1569 unsigned short i;
1570
1571 /* If tickets disabled behave as if no ticket present
1572 * to permit stateful resumption.
1573 */
1574 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1575 return 1;
1576
1577 if ((s->version <= SSL3_VERSION) || !limit)
1578 return 1;
1579 if (p >= limit)
1580 return -1;
1581 /* Skip past DTLS cookie */
1582 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1583 {
1584 i = *(p++);
1585 p+= i;
1586 if (p >= limit)
1587 return -1;
1588 }
1589 /* Skip past cipher list */
1590 n2s(p, i);
1591 p+= i;
1592 if (p >= limit)
1593 return -1;
1594 /* Skip past compression algorithm list */
1595 i = *(p++);
1596 p += i;
1597 if (p > limit)
1598 return -1;
1599 /* Now at start of extensions */
1600 if ((p + 2) >= limit)
1601 return 1;
1602 n2s(p, i);
1603 while ((p + 4) <= limit)
1604 {
1605 unsigned short type, size;
1606 n2s(p, type);
1607 n2s(p, size);
1608 if (p + size > limit)
1609 return 1;
1610 if (type == TLSEXT_TYPE_session_ticket)
1611 {
1612 /* If tickets disabled indicate cache miss which will
1613 * trigger a full handshake
1614 */
1615 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1616 return 1;
1617 /* If zero length note client will accept a ticket
1618 * and indicate cache miss to trigger full handshake
1619 */
1620 if (size == 0)
1621 {
1622 s->tlsext_ticket_expected = 1;
1623 return 0; /* Cache miss */
1624 }
1625 if (s->tls_session_secret_cb)
1626 {
1627 /* Indicate cache miss here and instead of
1628 * generating the session from ticket now,
1629 * trigger abbreviated handshake based on
1630 * external mechanism to calculate the master
1631 * secret later. */
1632 return 0;
1633 }
1634 return tls_decrypt_ticket(s, p, size, session_id, len,
1635 ret);
1636 }
1637 p += size;
1638 }
1639 return 1;
1640 }
1641
tls_decrypt_ticket(SSL * s,const unsigned char * etick,int eticklen,const unsigned char * sess_id,int sesslen,SSL_SESSION ** psess)1642 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1643 const unsigned char *sess_id, int sesslen,
1644 SSL_SESSION **psess)
1645 {
1646 SSL_SESSION *sess;
1647 unsigned char *sdec;
1648 const unsigned char *p;
1649 int slen, mlen, renew_ticket = 0;
1650 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1651 HMAC_CTX hctx;
1652 EVP_CIPHER_CTX ctx;
1653 SSL_CTX *tctx = s->initial_ctx;
1654 /* Need at least keyname + iv + some encrypted data */
1655 if (eticklen < 48)
1656 goto tickerr;
1657 /* Initialize session ticket encryption and HMAC contexts */
1658 HMAC_CTX_init(&hctx);
1659 EVP_CIPHER_CTX_init(&ctx);
1660 if (tctx->tlsext_ticket_key_cb)
1661 {
1662 unsigned char *nctick = (unsigned char *)etick;
1663 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1664 &ctx, &hctx, 0);
1665 if (rv < 0)
1666 return -1;
1667 if (rv == 0)
1668 goto tickerr;
1669 if (rv == 2)
1670 renew_ticket = 1;
1671 }
1672 else
1673 {
1674 /* Check key name matches */
1675 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1676 goto tickerr;
1677 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1678 tlsext_tick_md(), NULL);
1679 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1680 tctx->tlsext_tick_aes_key, etick + 16);
1681 }
1682 /* Attempt to process session ticket, first conduct sanity and
1683 * integrity checks on ticket.
1684 */
1685 mlen = HMAC_size(&hctx);
1686 if (mlen < 0)
1687 {
1688 EVP_CIPHER_CTX_cleanup(&ctx);
1689 return -1;
1690 }
1691 eticklen -= mlen;
1692 /* Check HMAC of encrypted ticket */
1693 HMAC_Update(&hctx, etick, eticklen);
1694 HMAC_Final(&hctx, tick_hmac, NULL);
1695 HMAC_CTX_cleanup(&hctx);
1696 if (memcmp(tick_hmac, etick + eticklen, mlen))
1697 goto tickerr;
1698 /* Attempt to decrypt session data */
1699 /* Move p after IV to start of encrypted ticket, update length */
1700 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1701 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1702 sdec = OPENSSL_malloc(eticklen);
1703 if (!sdec)
1704 {
1705 EVP_CIPHER_CTX_cleanup(&ctx);
1706 return -1;
1707 }
1708 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1709 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1710 goto tickerr;
1711 slen += mlen;
1712 EVP_CIPHER_CTX_cleanup(&ctx);
1713 p = sdec;
1714
1715 sess = d2i_SSL_SESSION(NULL, &p, slen);
1716 OPENSSL_free(sdec);
1717 if (sess)
1718 {
1719 /* The session ID if non-empty is used by some clients to
1720 * detect that the ticket has been accepted. So we copy it to
1721 * the session structure. If it is empty set length to zero
1722 * as required by standard.
1723 */
1724 if (sesslen)
1725 memcpy(sess->session_id, sess_id, sesslen);
1726 sess->session_id_length = sesslen;
1727 *psess = sess;
1728 s->tlsext_ticket_expected = renew_ticket;
1729 return 1;
1730 }
1731 /* If session decrypt failure indicate a cache miss and set state to
1732 * send a new ticket
1733 */
1734 tickerr:
1735 s->tlsext_ticket_expected = 1;
1736 return 0;
1737 }
1738
1739 #endif
1740