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-rw-r--r--src/lib/libssl/t1_lib.c799
1 files changed, 763 insertions, 36 deletions
diff --git a/src/lib/libssl/t1_lib.c b/src/lib/libssl/t1_lib.c
index ca6c03d5af..35f04afa4a 100644
--- a/src/lib/libssl/t1_lib.c
+++ b/src/lib/libssl/t1_lib.c
@@ -58,13 +58,20 @@
58 58
59#include <stdio.h> 59#include <stdio.h>
60#include <openssl/objects.h> 60#include <openssl/objects.h>
61#include <openssl/evp.h>
62#include <openssl/hmac.h>
63#include <openssl/ocsp.h>
61#include "ssl_locl.h" 64#include "ssl_locl.h"
62 65
63const char *tls1_version_str="TLSv1" OPENSSL_VERSION_PTEXT; 66const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
64 67
65static long tls1_default_timeout(void); 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
66 73
67static SSL3_ENC_METHOD TLSv1_enc_data={ 74SSL3_ENC_METHOD TLSv1_enc_data={
68 tls1_enc, 75 tls1_enc,
69 tls1_mac, 76 tls1_mac,
70 tls1_setup_key_block, 77 tls1_setup_key_block,
@@ -78,45 +85,17 @@ static SSL3_ENC_METHOD TLSv1_enc_data={
78 tls1_alert_code, 85 tls1_alert_code,
79 }; 86 };
80 87
81static SSL_METHOD TLSv1_data= { 88long tls1_default_timeout(void)
82 TLS1_VERSION,
83 tls1_new,
84 tls1_clear,
85 tls1_free,
86 ssl_undefined_function,
87 ssl_undefined_function,
88 ssl3_read,
89 ssl3_peek,
90 ssl3_write,
91 ssl3_shutdown,
92 ssl3_renegotiate,
93 ssl3_renegotiate_check,
94 ssl3_ctrl,
95 ssl3_ctx_ctrl,
96 ssl3_get_cipher_by_char,
97 ssl3_put_cipher_by_char,
98 ssl3_pending,
99 ssl3_num_ciphers,
100 ssl3_get_cipher,
101 ssl_bad_method,
102 tls1_default_timeout,
103 &TLSv1_enc_data,
104 ssl_undefined_function,
105 ssl3_callback_ctrl,
106 ssl3_ctx_callback_ctrl,
107 };
108
109static long tls1_default_timeout(void)
110 { 89 {
111 /* 2 hours, the 24 hours mentioned in the TLSv1 spec 90 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
112 * is way too long for http, the cache would over fill */ 91 * is way too long for http, the cache would over fill */
113 return(60*60*2); 92 return(60*60*2);
114 } 93 }
115 94
116SSL_METHOD *tlsv1_base_method(void) 95IMPLEMENT_tls1_meth_func(tlsv1_base_method,
117 { 96 ssl_undefined_function,
118 return(&TLSv1_data); 97 ssl_undefined_function,
119 } 98 ssl_bad_method)
120 99
121int tls1_new(SSL *s) 100int tls1_new(SSL *s)
122 { 101 {
@@ -147,3 +126,751 @@ long tls1_callback_ctrl(SSL *s, int cmd, void *(*fp)())
147 return(0); 126 return(0);
148 } 127 }
149#endif 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 if ((s->version <= SSL3_VERSION) || !limit)
738 return 1;
739 if (p >= limit)
740 return -1;
741 /* Skip past cipher list */
742 n2s(p, i);
743 p+= i;
744 if (p >= limit)
745 return -1;
746 /* Skip past compression algorithm list */
747 i = *(p++);
748 p += i;
749 if (p > limit)
750 return -1;
751 /* Now at start of extensions */
752 if ((p + 2) >= limit)
753 return 1;
754 n2s(p, i);
755 while ((p + 4) <= limit)
756 {
757 unsigned short type, size;
758 n2s(p, type);
759 n2s(p, size);
760 if (p + size > limit)
761 return 1;
762 if (type == TLSEXT_TYPE_session_ticket)
763 {
764 /* If tickets disabled indicate cache miss which will
765 * trigger a full handshake
766 */
767 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
768 return 0;
769 /* If zero length not client will accept a ticket
770 * and indicate cache miss to trigger full handshake
771 */
772 if (size == 0)
773 {
774 s->tlsext_ticket_expected = 1;
775 return 0; /* Cache miss */
776 }
777 return tls_decrypt_ticket(s, p, size, session_id, len,
778 ret);
779 }
780 p += size;
781 }
782 return 1;
783 }
784
785static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
786 const unsigned char *sess_id, int sesslen,
787 SSL_SESSION **psess)
788 {
789 SSL_SESSION *sess;
790 unsigned char *sdec;
791 const unsigned char *p;
792 int slen, mlen, renew_ticket = 0;
793 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
794 HMAC_CTX hctx;
795 EVP_CIPHER_CTX ctx;
796 /* Need at least keyname + iv + some encrypted data */
797 if (eticklen < 48)
798 goto tickerr;
799 /* Initialize session ticket encryption and HMAC contexts */
800 HMAC_CTX_init(&hctx);
801 EVP_CIPHER_CTX_init(&ctx);
802 if (s->ctx->tlsext_ticket_key_cb)
803 {
804 unsigned char *nctick = (unsigned char *)etick;
805 int rv = s->ctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
806 &ctx, &hctx, 0);
807 if (rv < 0)
808 return -1;
809 if (rv == 0)
810 goto tickerr;
811 if (rv == 2)
812 renew_ticket = 1;
813 }
814 else
815 {
816 /* Check key name matches */
817 if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
818 goto tickerr;
819 HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
820 tlsext_tick_md(), NULL);
821 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
822 s->ctx->tlsext_tick_aes_key, etick + 16);
823 }
824 /* Attempt to process session ticket, first conduct sanity and
825 * integrity checks on ticket.
826 */
827 mlen = HMAC_size(&hctx);
828 eticklen -= mlen;
829 /* Check HMAC of encrypted ticket */
830 HMAC_Update(&hctx, etick, eticklen);
831 HMAC_Final(&hctx, tick_hmac, NULL);
832 HMAC_CTX_cleanup(&hctx);
833 if (memcmp(tick_hmac, etick + eticklen, mlen))
834 goto tickerr;
835 /* Attempt to decrypt session data */
836 /* Move p after IV to start of encrypted ticket, update length */
837 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
838 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
839 sdec = OPENSSL_malloc(eticklen);
840 if (!sdec)
841 {
842 EVP_CIPHER_CTX_cleanup(&ctx);
843 return -1;
844 }
845 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
846 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
847 goto tickerr;
848 slen += mlen;
849 EVP_CIPHER_CTX_cleanup(&ctx);
850 p = sdec;
851
852 sess = d2i_SSL_SESSION(NULL, &p, slen);
853 OPENSSL_free(sdec);
854 if (sess)
855 {
856 /* The session ID if non-empty is used by some clients to
857 * detect that the ticket has been accepted. So we copy it to
858 * the session structure. If it is empty set length to zero
859 * as required by standard.
860 */
861 if (sesslen)
862 memcpy(sess->session_id, sess_id, sesslen);
863 sess->session_id_length = sesslen;
864 *psess = sess;
865 s->tlsext_ticket_expected = renew_ticket;
866 return 1;
867 }
868 /* If session decrypt failure indicate a cache miss and set state to
869 * send a new ticket
870 */
871 tickerr:
872 s->tlsext_ticket_expected = 1;
873 return 0;
874 }
875
876#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 11:39:57 +0000