2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include <openssl/objects.h>
61 #include <openssl/evp.h>
62 #include <openssl/hmac.h>
63 #include <openssl/ocsp.h>
66 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
68 #ifndef OPENSSL_NO_TLSEXT
69 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
70 const unsigned char *sess_id, int sesslen,
74 SSL3_ENC_METHOD TLSv1_enc_data={
78 tls1_generate_master_secret,
79 tls1_change_cipher_state,
80 tls1_final_finish_mac,
81 TLS1_FINISH_MAC_LENGTH,
83 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
84 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
88 long tls1_default_timeout(void)
90 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
91 * is way too long for http, the cache would over fill */
95 IMPLEMENT_tls1_meth_func(tlsv1_base_method,
96 ssl_undefined_function,
97 ssl_undefined_function,
102 if (!ssl3_new(s)) return(0);
103 s->method->ssl_clear(s);
107 void tls1_free(SSL *s)
112 void tls1_clear(SSL *s)
115 s->version=TLS1_VERSION;
119 long tls1_ctrl(SSL *s, int cmd, long larg, char *parg)
124 long tls1_callback_ctrl(SSL *s, int cmd, void *(*fp)())
130 #ifndef OPENSSL_NO_TLSEXT
131 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
134 unsigned char *ret = p;
136 /* don't add extensions for SSLv3 unless doing secure renegotiation */
137 if (s->client_version == SSL3_VERSION
138 && !s->s3->send_connection_binding)
143 if (ret>=limit) return NULL; /* this really never occurs, but ... */
145 if (s->tlsext_hostname != NULL)
147 /* Add TLS extension servername to the Client Hello message */
148 unsigned long size_str;
151 /* check for enough space.
152 4 for the servername type and entension length
153 2 for servernamelist length
154 1 for the hostname type
155 2 for hostname length
159 if ((lenmax = limit - ret - 9) < 0
160 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
163 /* extension type and length */
164 s2n(TLSEXT_TYPE_server_name,ret);
167 /* length of servername list */
170 /* hostname type, length and hostname */
171 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
173 memcpy(ret, s->tlsext_hostname, size_str);
178 /* Add the renegotiation option: TODOEKR switch */
182 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
184 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
188 if((limit - p - 4 - el) < 0) return NULL;
190 s2n(TLSEXT_TYPE_renegotiate,ret);
193 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
195 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
203 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
206 if (!s->new_session && s->session && s->session->tlsext_tick)
207 ticklen = s->session->tlsext_ticklen;
210 /* Check for enough room 2 for extension type, 2 for len
213 if (limit - ret - 4 - ticklen < 0)
215 s2n(TLSEXT_TYPE_session_ticket,ret);
219 memcpy(ret, s->session->tlsext_tick, ticklen);
224 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
225 s->version != DTLS1_VERSION)
228 long extlen, idlen, itmp;
232 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
234 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
235 itmp = i2d_OCSP_RESPID(id, NULL);
241 if (s->tlsext_ocsp_exts)
243 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
250 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
251 s2n(TLSEXT_TYPE_status_request, ret);
252 if (extlen + idlen > 0xFFF0)
254 s2n(extlen + idlen + 5, ret);
255 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
257 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
259 /* save position of id len */
260 unsigned char *q = ret;
261 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
262 /* skip over id len */
264 itmp = i2d_OCSP_RESPID(id, &ret);
270 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
273 if ((extdatalen = ret-p-2)== 0)
280 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
283 unsigned char *ret = p;
285 /* don't add extensions for SSLv3, unless doing secure renegotiation */
286 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
290 if (ret>=limit) return NULL; /* this really never occurs, but ... */
292 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
294 if (limit - ret - 4 < 0) return NULL;
296 s2n(TLSEXT_TYPE_server_name,ret);
300 if(s->s3->send_connection_binding)
304 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
306 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
310 if((limit - p - 4 - el) < 0) return NULL;
312 s2n(TLSEXT_TYPE_renegotiate,ret);
315 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
317 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
324 if (s->tlsext_ticket_expected
325 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
327 if (limit - ret - 4 < 0) return NULL;
328 s2n(TLSEXT_TYPE_session_ticket,ret);
332 if (s->tlsext_status_expected)
334 if ((long)(limit - ret - 4) < 0) return NULL;
335 s2n(TLSEXT_TYPE_status_request,ret);
339 if ((extdatalen = ret-p-2)== 0)
346 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
351 unsigned char *data = *p;
352 int renegotiate_seen = 0;
354 s->servername_done = 0;
355 s->tlsext_status_type = -1;
360 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
362 /* We should always see one extension: the renegotiate extension */
363 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
364 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
371 if (data > (d+n-len))
374 while (data <= (d+n-4))
379 if (data+size > (d+n))
382 if (s->tlsext_debug_cb)
383 s->tlsext_debug_cb(s, 0, type, data, size,
384 s->tlsext_debug_arg);
385 /* The servername extension is treated as follows:
387 - Only the hostname type is supported with a maximum length of 255.
388 - The servername is rejected if too long or if it contains zeros,
389 in which case an fatal alert is generated.
390 - The servername field is maintained together with the session cache.
391 - When a session is resumed, the servername call back invoked in order
392 to allow the application to position itself to the right context.
393 - The servername is acknowledged if it is new for a session or when
394 it is identical to a previously used for the same session.
395 Applications can control the behaviour. They can at any time
396 set a 'desirable' servername for a new SSL object. This can be the
397 case for example with HTTPS when a Host: header field is received and
398 a renegotiation is requested. In this case, a possible servername
399 presented in the new client hello is only acknowledged if it matches
400 the value of the Host: field.
401 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
402 if they provide for changing an explicit servername context for the session,
403 i.e. when the session has been established with a servername extension.
404 - On session reconnect, the servername extension may be absent.
408 if (type == TLSEXT_TYPE_server_name)
410 unsigned char *sdata;
416 *al = SSL_AD_DECODE_ERROR;
423 *al = SSL_AD_DECODE_ERROR;
430 servname_type = *(sdata++);
436 *al = SSL_AD_DECODE_ERROR;
439 if (s->servername_done == 0)
440 switch (servname_type)
442 case TLSEXT_NAMETYPE_host_name:
443 if (s->session->tlsext_hostname == NULL)
445 if (len > TLSEXT_MAXLEN_host_name ||
446 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
448 *al = TLS1_AD_UNRECOGNIZED_NAME;
451 memcpy(s->session->tlsext_hostname, sdata, len);
452 s->session->tlsext_hostname[len]='\0';
453 if (strlen(s->session->tlsext_hostname) != len) {
454 OPENSSL_free(s->session->tlsext_hostname);
455 s->session->tlsext_hostname = NULL;
456 *al = TLS1_AD_UNRECOGNIZED_NAME;
459 s->servername_done = 1;
463 s->servername_done = strlen(s->session->tlsext_hostname) == len
464 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
476 *al = SSL_AD_DECODE_ERROR;
481 else if (type == TLSEXT_TYPE_renegotiate)
483 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
485 renegotiate_seen = 1;
487 else if (type == TLSEXT_TYPE_status_request &&
488 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
493 *al = SSL_AD_DECODE_ERROR;
497 s->tlsext_status_type = *data++;
499 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
501 const unsigned char *sdata;
503 /* Read in responder_id_list */
508 *al = SSL_AD_DECODE_ERROR;
517 *al = SSL_AD_DECODE_ERROR;
524 *al = SSL_AD_DECODE_ERROR;
529 id = d2i_OCSP_RESPID(NULL,
533 *al = SSL_AD_DECODE_ERROR;
538 OCSP_RESPID_free(id);
539 *al = SSL_AD_DECODE_ERROR;
542 if (!s->tlsext_ocsp_ids
543 && !(s->tlsext_ocsp_ids =
544 sk_OCSP_RESPID_new_null()))
546 OCSP_RESPID_free(id);
547 *al = SSL_AD_INTERNAL_ERROR;
550 if (!sk_OCSP_RESPID_push(
551 s->tlsext_ocsp_ids, id))
553 OCSP_RESPID_free(id);
554 *al = SSL_AD_INTERNAL_ERROR;
559 /* Read in request_extensions */
564 *al = SSL_AD_DECODE_ERROR;
570 s->tlsext_ocsp_exts =
571 d2i_X509_EXTENSIONS(NULL,
573 if (!s->tlsext_ocsp_exts
574 || (data + dsize != sdata))
576 *al = SSL_AD_DECODE_ERROR;
581 /* We don't know what to do with any other type
585 s->tlsext_status_type = -1;
588 /* session ticket processed earlier */
593 if (s->new_session && !renegotiate_seen
594 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
596 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
597 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
605 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
610 unsigned char *data = *p;
611 int tlsext_servername = 0;
612 int renegotiate_seen = 0;
616 /* Because the client does not see any renegotiation during an
617 attack, we must enforce this on all server hellos, even the
619 if (!(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
621 /* We should always see one extension: the renegotiate extension */
622 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
623 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
631 while(data <= (d+n-4))
636 if (data+size > (d+n))
639 if (s->tlsext_debug_cb)
640 s->tlsext_debug_cb(s, 1, type, data, size,
641 s->tlsext_debug_arg);
643 if (type == TLSEXT_TYPE_server_name)
645 if (s->tlsext_hostname == NULL || size > 0)
647 *al = TLS1_AD_UNRECOGNIZED_NAME;
650 tlsext_servername = 1;
652 else if (type == TLSEXT_TYPE_session_ticket)
654 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
657 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
660 s->tlsext_ticket_expected = 1;
662 else if (type == TLSEXT_TYPE_status_request &&
663 s->version != DTLS1_VERSION)
665 /* MUST be empty and only sent if we've requested
666 * a status request message.
668 if ((s->tlsext_status_type == -1) || (size > 0))
670 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
673 /* Set flag to expect CertificateStatus message */
674 s->tlsext_status_expected = 1;
676 else if (type == TLSEXT_TYPE_renegotiate)
678 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
680 renegotiate_seen = 1;
687 *al = SSL_AD_DECODE_ERROR;
691 if (!renegotiate_seen
692 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
694 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
695 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
699 if (!s->hit && tlsext_servername == 1)
701 if (s->tlsext_hostname)
703 if (s->session->tlsext_hostname == NULL)
705 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
706 if (!s->session->tlsext_hostname)
708 *al = SSL_AD_UNRECOGNIZED_NAME;
714 *al = SSL_AD_DECODE_ERROR;
724 int ssl_check_clienthello_tlsext(SSL *s)
726 int ret=SSL_TLSEXT_ERR_NOACK;
727 int al = SSL_AD_UNRECOGNIZED_NAME;
729 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
730 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
731 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
732 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
734 /* If status request then ask callback what to do.
735 * Note: this must be called after servername callbacks in case
736 * the certificate has changed.
738 if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
741 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
744 /* We don't want to send a status request response */
745 case SSL_TLSEXT_ERR_NOACK:
746 s->tlsext_status_expected = 0;
748 /* status request response should be sent */
749 case SSL_TLSEXT_ERR_OK:
750 if (s->tlsext_ocsp_resp)
751 s->tlsext_status_expected = 1;
753 s->tlsext_status_expected = 0;
755 /* something bad happened */
756 case SSL_TLSEXT_ERR_ALERT_FATAL:
757 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
758 al = SSL_AD_INTERNAL_ERROR;
763 s->tlsext_status_expected = 0;
767 case SSL_TLSEXT_ERR_ALERT_FATAL:
768 ssl3_send_alert(s,SSL3_AL_FATAL,al);
771 case SSL_TLSEXT_ERR_ALERT_WARNING:
772 ssl3_send_alert(s,SSL3_AL_WARNING,al);
775 case SSL_TLSEXT_ERR_NOACK:
776 s->servername_done=0;
782 int ssl_check_serverhello_tlsext(SSL *s)
784 int ret=SSL_TLSEXT_ERR_NOACK;
785 int al = SSL_AD_UNRECOGNIZED_NAME;
787 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
788 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
789 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
790 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
792 /* If we've requested certificate status and we wont get one
795 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
796 && s->ctx->tlsext_status_cb)
799 /* Set resp to NULL, resplen to -1 so callback knows
800 * there is no response.
802 if (s->tlsext_ocsp_resp)
804 OPENSSL_free(s->tlsext_ocsp_resp);
805 s->tlsext_ocsp_resp = NULL;
807 s->tlsext_ocsp_resplen = -1;
808 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
811 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
812 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
816 al = SSL_AD_INTERNAL_ERROR;
817 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
823 case SSL_TLSEXT_ERR_ALERT_FATAL:
824 ssl3_send_alert(s,SSL3_AL_FATAL,al);
827 case SSL_TLSEXT_ERR_ALERT_WARNING:
828 ssl3_send_alert(s,SSL3_AL_WARNING,al);
831 case SSL_TLSEXT_ERR_NOACK:
832 s->servername_done=0;
838 /* Since the server cache lookup is done early on in the processing of client
839 * hello and other operations depend on the result we need to handle any TLS
840 * session ticket extension at the same time.
843 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
844 const unsigned char *limit, SSL_SESSION **ret)
846 /* Point after session ID in client hello */
847 const unsigned char *p = session_id + len;
850 /* If tickets disabled behave as if no ticket present
851 * to permit stateful resumption.
853 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
856 if ((s->version <= SSL3_VERSION) || !limit)
860 /* Skip past DTLS cookie */
861 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
868 /* Skip past cipher list */
873 /* Skip past compression algorithm list */
878 /* Now at start of extensions */
879 if ((p + 2) >= limit)
882 while ((p + 4) <= limit)
884 unsigned short type, size;
887 if (p + size > limit)
889 if (type == TLSEXT_TYPE_session_ticket)
891 /* If zero length note client will accept a ticket
892 * and indicate cache miss to trigger full handshake
896 s->tlsext_ticket_expected = 1;
897 return 0; /* Cache miss */
899 return tls_decrypt_ticket(s, p, size, session_id, len,
907 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
908 const unsigned char *sess_id, int sesslen,
913 const unsigned char *p;
914 int slen, mlen, renew_ticket = 0;
915 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
918 SSL_CTX *tctx = s->initial_ctx;
919 /* Need at least keyname + iv + some encrypted data */
922 /* Initialize session ticket encryption and HMAC contexts */
923 HMAC_CTX_init(&hctx);
924 EVP_CIPHER_CTX_init(&ctx);
925 if (tctx->tlsext_ticket_key_cb)
927 unsigned char *nctick = (unsigned char *)etick;
928 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
939 /* Check key name matches */
940 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
942 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
943 tlsext_tick_md(), NULL);
944 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
945 tctx->tlsext_tick_aes_key, etick + 16);
947 /* Attempt to process session ticket, first conduct sanity and
948 * integrity checks on ticket.
950 mlen = HMAC_size(&hctx);
952 /* Check HMAC of encrypted ticket */
953 HMAC_Update(&hctx, etick, eticklen);
954 HMAC_Final(&hctx, tick_hmac, NULL);
955 HMAC_CTX_cleanup(&hctx);
956 if (memcmp(tick_hmac, etick + eticklen, mlen))
958 /* Attempt to decrypt session data */
959 /* Move p after IV to start of encrypted ticket, update length */
960 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
961 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
962 sdec = OPENSSL_malloc(eticklen);
965 EVP_CIPHER_CTX_cleanup(&ctx);
968 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
969 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
972 EVP_CIPHER_CTX_cleanup(&ctx);
975 sess = d2i_SSL_SESSION(NULL, &p, slen);
979 /* The session ID if non-empty is used by some clients to
980 * detect that the ticket has been accepted. So we copy it to
981 * the session structure. If it is empty set length to zero
982 * as required by standard.
985 memcpy(sess->session_id, sess_id, sesslen);
986 sess->session_id_length = sesslen;
988 s->tlsext_ticket_expected = renew_ticket;
991 /* If session decrypt failure indicate a cache miss and set state to
995 s->tlsext_ticket_expected = 1;