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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#include <stdio.h>
60#include <openssl/objects.h>
61#include <openssl/evp.h>
62#include <openssl/hmac.h>
63#include <openssl/ocsp.h>
64#include "ssl_locl.h"
65
66const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
67
68#ifndef OPENSSL_NO_TLSEXT
69static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
70 const unsigned char *sess_id, int sesslen,
71 SSL_SESSION **psess);
72#endif
73
74SSL3_ENC_METHOD TLSv1_enc_data={
75 tls1_enc,
76 tls1_mac,
77 tls1_setup_key_block,
78 tls1_generate_master_secret,
79 tls1_change_cipher_state,
80 tls1_final_finish_mac,
81 TLS1_FINISH_MAC_LENGTH,
82 tls1_cert_verify_mac,
83 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
84 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
85 tls1_alert_code,
86 };
87
88long tls1_default_timeout(void)
89 {
90 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
91 * is way too long for http, the cache would over fill */
92 return(60*60*2);
93 }
94
95IMPLEMENT_tls1_meth_func(tlsv1_base_method,
96 ssl_undefined_function,
97 ssl_undefined_function,
98 ssl_bad_method)
99
100int tls1_new(SSL *s)
101 {
102 if (!ssl3_new(s)) return(0);
103 s->method->ssl_clear(s);
104 return(1);
105 }
106
107void tls1_free(SSL *s)
108 {
109 ssl3_free(s);
110 }
111
112void tls1_clear(SSL *s)
113 {
114 ssl3_clear(s);
115 s->version=TLS1_VERSION;
116 }
117
118#if 0
119long tls1_ctrl(SSL *s, int cmd, long larg, char *parg)
120 {
121 return(0);
122 }
123
124long tls1_callback_ctrl(SSL *s, int cmd, void *(*fp)())
125 {
126 return(0);
127 }
128#endif
129
130#ifndef OPENSSL_NO_TLSEXT
131unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
132 {
133 int extdatalen=0;
134 unsigned char *ret = p;
135
136 ret+=2;
137
138 if (ret>=limit) return NULL; /* this really never occurs, but ... */
139
140 if (s->tlsext_hostname != NULL)
141 {
142 /* Add TLS extension servername to the Client Hello message */
143 unsigned long size_str;
144 long lenmax;
145
146 /* check for enough space.
147 4 for the servername type and entension length
148 2 for servernamelist length
149 1 for the hostname type
150 2 for hostname length
151 + hostname length
152 */
153
154 if ((lenmax = limit - ret - 9) < 0
155 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
156 return NULL;
157
158 /* extension type and length */
159 s2n(TLSEXT_TYPE_server_name,ret);
160 s2n(size_str+5,ret);
161
162 /* length of servername list */
163 s2n(size_str+3,ret);
164
165 /* hostname type, length and hostname */
166 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
167 s2n(size_str,ret);
168 memcpy(ret, s->tlsext_hostname, size_str);
169 ret+=size_str;
170
171 }
172
173 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
174 {
175 int ticklen;
176 if (s->session && s->session->tlsext_tick)
177 ticklen = s->session->tlsext_ticklen;
178 else
179 ticklen = 0;
180 /* Check for enough room 2 for extension type, 2 for len
181 * rest for ticket
182 */
183 if (limit - ret - 4 - ticklen < 0)
184 return NULL;
185 s2n(TLSEXT_TYPE_session_ticket,ret);
186 s2n(ticklen,ret);
187 if (ticklen)
188 {
189 memcpy(ret, s->session->tlsext_tick, ticklen);
190 ret += ticklen;
191 }
192 }
193
194 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
195 {
196 int i;
197 long extlen, idlen, itmp;
198 OCSP_RESPID *id;
199
200 idlen = 0;
201 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
202 {
203 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
204 itmp = i2d_OCSP_RESPID(id, NULL);
205 if (itmp <= 0)
206 return NULL;
207 idlen += itmp + 2;
208 }
209
210 if (s->tlsext_ocsp_exts)
211 {
212 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
213 if (extlen < 0)
214 return NULL;
215 }
216 else
217 extlen = 0;
218
219 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
220 s2n(TLSEXT_TYPE_status_request, ret);
221 if (extlen + idlen > 0xFFF0)
222 return NULL;
223 s2n(extlen + idlen + 5, ret);
224 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
225 s2n(idlen, ret);
226 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
227 {
228 /* save position of id len */
229 unsigned char *q = ret;
230 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
231 /* skip over id len */
232 ret += 2;
233 itmp = i2d_OCSP_RESPID(id, &ret);
234 /* write id len */
235 s2n(itmp, q);
236 }
237 s2n(extlen, ret);
238 if (extlen > 0)
239 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
240 }
241
242 if ((extdatalen = ret-p-2)== 0)
243 return p;
244
245 s2n(extdatalen,p);
246 return ret;
247 }
248
249unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
250 {
251 int extdatalen=0;
252 unsigned char *ret = p;
253
254 ret+=2;
255 if (ret>=limit) return NULL; /* this really never occurs, but ... */
256
257 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
258 {
259 if (limit - ret - 4 < 0) return NULL;
260
261 s2n(TLSEXT_TYPE_server_name,ret);
262 s2n(0,ret);
263 }
264
265 if (s->tlsext_ticket_expected
266 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
267 {
268 if (limit - ret - 4 < 0) return NULL;
269 s2n(TLSEXT_TYPE_session_ticket,ret);
270 s2n(0,ret);
271 }
272
273 if (s->tlsext_status_expected)
274 {
275 if ((long)(limit - ret - 4) < 0) return NULL;
276 s2n(TLSEXT_TYPE_status_request,ret);
277 s2n(0,ret);
278 }
279
280 if ((extdatalen = ret-p-2)== 0)
281 return p;
282
283 s2n(extdatalen,p);
284 return ret;
285 }
286
287int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
288 {
289 unsigned short type;
290 unsigned short size;
291 unsigned short len;
292 unsigned char *data = *p;
293 s->servername_done = 0;
294 s->tlsext_status_type = -1;
295
296 if (data >= (d+n-2))
297 return 1;
298 n2s(data,len);
299
300 if (data > (d+n-len))
301 return 1;
302
303 while (data <= (d+n-4))
304 {
305 n2s(data,type);
306 n2s(data,size);
307
308 if (data+size > (d+n))
309 return 1;
310
311 if (s->tlsext_debug_cb)
312 s->tlsext_debug_cb(s, 0, type, data, size,
313 s->tlsext_debug_arg);
314/* The servername extension is treated as follows:
315
316 - Only the hostname type is supported with a maximum length of 255.
317 - The servername is rejected if too long or if it contains zeros,
318 in which case an fatal alert is generated.
319 - The servername field is maintained together with the session cache.
320 - When a session is resumed, the servername call back invoked in order
321 to allow the application to position itself to the right context.
322 - The servername is acknowledged if it is new for a session or when
323 it is identical to a previously used for the same session.
324 Applications can control the behaviour. They can at any time
325 set a 'desirable' servername for a new SSL object. This can be the
326 case for example with HTTPS when a Host: header field is received and
327 a renegotiation is requested. In this case, a possible servername
328 presented in the new client hello is only acknowledged if it matches
329 the value of the Host: field.
330 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
331 if they provide for changing an explicit servername context for the session,
332 i.e. when the session has been established with a servername extension.
333 - On session reconnect, the servername extension may be absent.
334
335*/
336
337 if (type == TLSEXT_TYPE_server_name)
338 {
339 unsigned char *sdata;
340 int servname_type;
341 int dsize;
342
343 if (size < 2)
344 {
345 *al = SSL_AD_DECODE_ERROR;
346 return 0;
347 }
348 n2s(data,dsize);
349 size -= 2;
350 if (dsize > size )
351 {
352 *al = SSL_AD_DECODE_ERROR;
353 return 0;
354 }
355
356 sdata = data;
357 while (dsize > 3)
358 {
359 servname_type = *(sdata++);
360 n2s(sdata,len);
361 dsize -= 3;
362
363 if (len > dsize)
364 {
365 *al = SSL_AD_DECODE_ERROR;
366 return 0;
367 }
368 if (s->servername_done == 0)
369 switch (servname_type)
370 {
371 case TLSEXT_NAMETYPE_host_name:
372 if (s->session->tlsext_hostname == NULL)
373 {
374 if (len > TLSEXT_MAXLEN_host_name ||
375 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
376 {
377 *al = TLS1_AD_UNRECOGNIZED_NAME;
378 return 0;
379 }
380 memcpy(s->session->tlsext_hostname, sdata, len);
381 s->session->tlsext_hostname[len]='\0';
382 if (strlen(s->session->tlsext_hostname) != len) {
383 OPENSSL_free(s->session->tlsext_hostname);
384 s->session->tlsext_hostname = NULL;
385 *al = TLS1_AD_UNRECOGNIZED_NAME;
386 return 0;
387 }
388 s->servername_done = 1;
389
390 }
391 else
392 s->servername_done = strlen(s->session->tlsext_hostname) == len
393 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
394
395 break;
396
397 default:
398 break;
399 }
400
401 dsize -= len;
402 }
403 if (dsize != 0)
404 {
405 *al = SSL_AD_DECODE_ERROR;
406 return 0;
407 }
408
409 }
410 else if (type == TLSEXT_TYPE_status_request
411 && s->ctx->tlsext_status_cb)
412 {
413
414 if (size < 5)
415 {
416 *al = SSL_AD_DECODE_ERROR;
417 return 0;
418 }
419
420 s->tlsext_status_type = *data++;
421 size--;
422 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
423 {
424 const unsigned char *sdata;
425 int dsize;
426 /* Read in responder_id_list */
427 n2s(data,dsize);
428 size -= 2;
429 if (dsize > size )
430 {
431 *al = SSL_AD_DECODE_ERROR;
432 return 0;
433 }
434 while (dsize > 0)
435 {
436 OCSP_RESPID *id;
437 int idsize;
438 if (dsize < 4)
439 {
440 *al = SSL_AD_DECODE_ERROR;
441 return 0;
442 }
443 n2s(data, idsize);
444 dsize -= 2 + idsize;
445 if (dsize < 0)
446 {
447 *al = SSL_AD_DECODE_ERROR;
448 return 0;
449 }
450 sdata = data;
451 data += idsize;
452 id = d2i_OCSP_RESPID(NULL,
453 &sdata, idsize);
454 if (!id)
455 {
456 *al = SSL_AD_DECODE_ERROR;
457 return 0;
458 }
459 if (data != sdata)
460 {
461 OCSP_RESPID_free(id);
462 *al = SSL_AD_DECODE_ERROR;
463 return 0;
464 }
465 if (!s->tlsext_ocsp_ids
466 && !(s->tlsext_ocsp_ids =
467 sk_OCSP_RESPID_new_null()))
468 {
469 OCSP_RESPID_free(id);
470 *al = SSL_AD_INTERNAL_ERROR;
471 return 0;
472 }
473 if (!sk_OCSP_RESPID_push(
474 s->tlsext_ocsp_ids, id))
475 {
476 OCSP_RESPID_free(id);
477 *al = SSL_AD_INTERNAL_ERROR;
478 return 0;
479 }
480 }
481
482 /* Read in request_extensions */
483 n2s(data,dsize);
484 size -= 2;
485 if (dsize > size)
486 {
487 *al = SSL_AD_DECODE_ERROR;
488 return 0;
489 }
490 sdata = data;
491 if (dsize > 0)
492 {
493 s->tlsext_ocsp_exts =
494 d2i_X509_EXTENSIONS(NULL,
495 &sdata, dsize);
496 if (!s->tlsext_ocsp_exts
497 || (data + dsize != sdata))
498 {
499 *al = SSL_AD_DECODE_ERROR;
500 return 0;
501 }
502 }
503 }
504 /* We don't know what to do with any other type
505 * so ignore it.
506 */
507 else
508 s->tlsext_status_type = -1;
509 }
510 /* session ticket processed earlier */
511
512 data+=size;
513 }
514
515 *p = data;
516 return 1;
517 }
518
519int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
520 {
521 unsigned short type;
522 unsigned short size;
523 unsigned short len;
524 unsigned char *data = *p;
525
526 int tlsext_servername = 0;
527
528 if (data >= (d+n-2))
529 return 1;
530
531 n2s(data,len);
532
533 while(data <= (d+n-4))
534 {
535 n2s(data,type);
536 n2s(data,size);
537
538 if (data+size > (d+n))
539 return 1;
540
541 if (s->tlsext_debug_cb)
542 s->tlsext_debug_cb(s, 1, type, data, size,
543 s->tlsext_debug_arg);
544
545 if (type == TLSEXT_TYPE_server_name)
546 {
547 if (s->tlsext_hostname == NULL || size > 0)
548 {
549 *al = TLS1_AD_UNRECOGNIZED_NAME;
550 return 0;
551 }
552 tlsext_servername = 1;
553 }
554 else if (type == TLSEXT_TYPE_session_ticket)
555 {
556 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
557 || (size > 0))
558 {
559 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
560 return 0;
561 }
562 s->tlsext_ticket_expected = 1;
563 }
564 else if (type == TLSEXT_TYPE_status_request)
565 {
566 /* MUST be empty and only sent if we've requested
567 * a status request message.
568 */
569 if ((s->tlsext_status_type == -1) || (size > 0))
570 {
571 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
572 return 0;
573 }
574 /* Set flag to expect CertificateStatus message */
575 s->tlsext_status_expected = 1;
576 }
577
578 data+=size;
579 }
580
581 if (data != d+n)
582 {
583 *al = SSL_AD_DECODE_ERROR;
584 return 0;
585 }
586
587 if (!s->hit && tlsext_servername == 1)
588 {
589 if (s->tlsext_hostname)
590 {
591 if (s->session->tlsext_hostname == NULL)
592 {
593 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
594 if (!s->session->tlsext_hostname)
595 {
596 *al = SSL_AD_UNRECOGNIZED_NAME;
597 return 0;
598 }
599 }
600 else
601 {
602 *al = SSL_AD_DECODE_ERROR;
603 return 0;
604 }
605 }
606 }
607
608 *p = data;
609 return 1;
610 }
611
612int ssl_check_clienthello_tlsext(SSL *s)
613 {
614 int ret=SSL_TLSEXT_ERR_NOACK;
615 int al = SSL_AD_UNRECOGNIZED_NAME;
616
617 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
618 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
619 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
620 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
621
622 /* If status request then ask callback what to do.
623 * Note: this must be called after servername callbacks in case
624 * the certificate has changed.
625 */
626 if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
627 {
628 int r;
629 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
630 switch (r)
631 {
632 /* We don't want to send a status request response */
633 case SSL_TLSEXT_ERR_NOACK:
634 s->tlsext_status_expected = 0;
635 break;
636 /* status request response should be sent */
637 case SSL_TLSEXT_ERR_OK:
638 if (s->tlsext_ocsp_resp)
639 s->tlsext_status_expected = 1;
640 else
641 s->tlsext_status_expected = 0;
642 break;
643 /* something bad happened */
644 case SSL_TLSEXT_ERR_ALERT_FATAL:
645 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
646 al = SSL_AD_INTERNAL_ERROR;
647 goto err;
648 }
649 }
650 else
651 s->tlsext_status_expected = 0;
652 err:
653 switch (ret)
654 {
655 case SSL_TLSEXT_ERR_ALERT_FATAL:
656 ssl3_send_alert(s,SSL3_AL_FATAL,al);
657 return -1;
658
659 case SSL_TLSEXT_ERR_ALERT_WARNING:
660 ssl3_send_alert(s,SSL3_AL_WARNING,al);
661 return 1;
662
663 case SSL_TLSEXT_ERR_NOACK:
664 s->servername_done=0;
665 default:
666 return 1;
667 }
668 }
669
670int ssl_check_serverhello_tlsext(SSL *s)
671 {
672 int ret=SSL_TLSEXT_ERR_NOACK;
673 int al = SSL_AD_UNRECOGNIZED_NAME;
674
675 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
676 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
677 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
678 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
679
680 /* If we've requested certificate status and we wont get one
681 * tell the callback
682 */
683 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
684 && s->ctx->tlsext_status_cb)
685 {
686 int r;
687 /* Set resp to NULL, resplen to -1 so callback knows
688 * there is no response.
689 */
690 if (s->tlsext_ocsp_resp)
691 {
692 OPENSSL_free(s->tlsext_ocsp_resp);
693 s->tlsext_ocsp_resp = NULL;
694 }
695 s->tlsext_ocsp_resplen = -1;
696 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
697 if (r == 0)
698 {
699 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
700 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
701 }
702 if (r < 0)
703 {
704 al = SSL_AD_INTERNAL_ERROR;
705 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
706 }
707 }
708
709 switch (ret)
710 {
711 case SSL_TLSEXT_ERR_ALERT_FATAL:
712 ssl3_send_alert(s,SSL3_AL_FATAL,al);
713 return -1;
714
715 case SSL_TLSEXT_ERR_ALERT_WARNING:
716 ssl3_send_alert(s,SSL3_AL_WARNING,al);
717 return 1;
718
719 case SSL_TLSEXT_ERR_NOACK:
720 s->servername_done=0;
721 default:
722 return 1;
723 }
724 }
725
726/* Since the server cache lookup is done early on in the processing of client
727 * hello and other operations depend on the result we need to handle any TLS
728 * session ticket extension at the same time.
729 */
730
731int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
732 const unsigned char *limit, SSL_SESSION **ret)
733 {
734 /* Point after session ID in client hello */
735 const unsigned char *p = session_id + len;
736 unsigned short i;
737
738 /* If tickets disabled behave as if no ticket present
739 * to permit stateful resumption.
740 */
741 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
742 return 1;
743
744 if ((s->version <= SSL3_VERSION) || !limit)
745 return 1;
746 if (p >= limit)
747 return -1;
748 /* Skip past cipher list */
749 n2s(p, i);
750 p+= i;
751 if (p >= limit)
752 return -1;
753 /* Skip past compression algorithm list */
754 i = *(p++);
755 p += i;
756 if (p > limit)
757 return -1;
758 /* Now at start of extensions */
759 if ((p + 2) >= limit)
760 return 1;
761 n2s(p, i);
762 while ((p + 4) <= limit)
763 {
764 unsigned short type, size;
765 n2s(p, type);
766 n2s(p, size);
767 if (p + size > limit)
768 return 1;
769 if (type == TLSEXT_TYPE_session_ticket)
770 {
771 /* If zero length note client will accept a ticket
772 * and indicate cache miss to trigger full handshake
773 */
774 if (size == 0)
775 {
776 s->tlsext_ticket_expected = 1;
777 return 0; /* Cache miss */
778 }
779 return tls_decrypt_ticket(s, p, size, session_id, len,
780 ret);
781 }
782 p += size;
783 }
784 return 1;
785 }
786
787static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
788 const unsigned char *sess_id, int sesslen,
789 SSL_SESSION **psess)
790 {
791 SSL_SESSION *sess;
792 unsigned char *sdec;
793 const unsigned char *p;
794 int slen, mlen, renew_ticket = 0;
795 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
796 HMAC_CTX hctx;
797 EVP_CIPHER_CTX ctx;
798 /* Need at least keyname + iv + some encrypted data */
799 if (eticklen < 48)
800 goto tickerr;
801 /* Initialize session ticket encryption and HMAC contexts */
802 HMAC_CTX_init(&hctx);
803 EVP_CIPHER_CTX_init(&ctx);
804 if (s->ctx->tlsext_ticket_key_cb)
805 {
806 unsigned char *nctick = (unsigned char *)etick;
807 int rv = s->ctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
808 &ctx, &hctx, 0);
809 if (rv < 0)
810 return -1;
811 if (rv == 0)
812 goto tickerr;
813 if (rv == 2)
814 renew_ticket = 1;
815 }
816 else
817 {
818 /* Check key name matches */
819 if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
820 goto tickerr;
821 HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
822 tlsext_tick_md(), NULL);
823 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
824 s->ctx->tlsext_tick_aes_key, etick + 16);
825 }
826 /* Attempt to process session ticket, first conduct sanity and
827 * integrity checks on ticket.
828 */
829 mlen = HMAC_size(&hctx);
830 eticklen -= mlen;
831 /* Check HMAC of encrypted ticket */
832 HMAC_Update(&hctx, etick, eticklen);
833 HMAC_Final(&hctx, tick_hmac, NULL);
834 HMAC_CTX_cleanup(&hctx);
835 if (memcmp(tick_hmac, etick + eticklen, mlen))
836 goto tickerr;
837 /* Attempt to decrypt session data */
838 /* Move p after IV to start of encrypted ticket, update length */
839 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
840 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
841 sdec = OPENSSL_malloc(eticklen);
842 if (!sdec)
843 {
844 EVP_CIPHER_CTX_cleanup(&ctx);
845 return -1;
846 }
847 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
848 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
849 goto tickerr;
850 slen += mlen;
851 EVP_CIPHER_CTX_cleanup(&ctx);
852 p = sdec;
853
854 sess = d2i_SSL_SESSION(NULL, &p, slen);
855 OPENSSL_free(sdec);
856 if (sess)
857 {
858 /* The session ID if non-empty is used by some clients to
859 * detect that the ticket has been accepted. So we copy it to
860 * the session structure. If it is empty set length to zero
861 * as required by standard.
862 */
863 if (sesslen)
864 memcpy(sess->session_id, sess_id, sesslen);
865 sess->session_id_length = sesslen;
866 *psess = sess;
867 s->tlsext_ticket_expected = renew_ticket;
868 return 1;
869 }
870 /* If session decrypt failure indicate a cache miss and set state to
871 * send a new ticket
872 */
873 tickerr:
874 s->tlsext_ticket_expected = 1;
875 return 0;
876 }
877
878#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-28 01:32:59 +0000