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 */
137 if (s->client_version == SSL3_VERSION)
142 if (ret>=limit) return NULL; /* this really never occurs, but ... */
144 if (s->tlsext_hostname != NULL)
146 /* Add TLS extension servername to the Client Hello message */
147 unsigned long size_str;
150 /* check for enough space.
151 4 for the servername type and entension length
152 2 for servernamelist length
153 1 for the hostname type
154 2 for hostname length
158 if ((lenmax = limit - ret - 9) < 0
159 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
162 /* extension type and length */
163 s2n(TLSEXT_TYPE_server_name,ret);
166 /* length of servername list */
169 /* hostname type, length and hostname */
170 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
172 memcpy(ret, s->tlsext_hostname, size_str);
177 /* Add the renegotiation option: TODOEKR switch */
181 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
183 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
187 if((limit - p - 4 - el) < 0) return NULL;
189 s2n(TLSEXT_TYPE_renegotiate,ret);
192 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
194 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
202 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
205 if (!s->new_session && s->session && s->session->tlsext_tick)
206 ticklen = s->session->tlsext_ticklen;
209 /* Check for enough room 2 for extension type, 2 for len
212 if (limit - ret - 4 - ticklen < 0)
214 s2n(TLSEXT_TYPE_session_ticket,ret);
218 memcpy(ret, s->session->tlsext_tick, ticklen);
223 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
226 long extlen, idlen, itmp;
230 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
232 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
233 itmp = i2d_OCSP_RESPID(id, NULL);
239 if (s->tlsext_ocsp_exts)
241 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
248 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
249 s2n(TLSEXT_TYPE_status_request, ret);
250 if (extlen + idlen > 0xFFF0)
252 s2n(extlen + idlen + 5, ret);
253 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
255 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
257 /* save position of id len */
258 unsigned char *q = ret;
259 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
260 /* skip over id len */
262 itmp = i2d_OCSP_RESPID(id, &ret);
268 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
271 if ((extdatalen = ret-p-2)== 0)
278 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
281 unsigned char *ret = p;
283 /* don't add extensions for SSLv3 */
284 if (s->version == SSL3_VERSION)
288 if (ret>=limit) return NULL; /* this really never occurs, but ... */
290 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
292 if (limit - ret - 4 < 0) return NULL;
294 s2n(TLSEXT_TYPE_server_name,ret);
298 if(s->s3->send_connection_binding)
302 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
304 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
308 if((limit - p - 4 - el) < 0) return NULL;
310 s2n(TLSEXT_TYPE_renegotiate,ret);
313 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
315 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
322 if (s->tlsext_ticket_expected
323 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
325 if (limit - ret - 4 < 0) return NULL;
326 s2n(TLSEXT_TYPE_session_ticket,ret);
330 if (s->tlsext_status_expected)
332 if ((long)(limit - ret - 4) < 0) return NULL;
333 s2n(TLSEXT_TYPE_status_request,ret);
337 if ((extdatalen = ret-p-2)== 0)
344 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
349 unsigned char *data = *p;
350 int renegotiate_seen = 0;
352 s->servername_done = 0;
353 s->tlsext_status_type = -1;
354 s->s3->send_connection_binding = 0;
359 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
361 /* We should always see one extension: the renegotiate extension */
362 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
363 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
370 if (data > (d+n-len))
373 while (data <= (d+n-4))
378 if (data+size > (d+n))
381 if (s->tlsext_debug_cb)
382 s->tlsext_debug_cb(s, 0, type, data, size,
383 s->tlsext_debug_arg);
384 /* The servername extension is treated as follows:
386 - Only the hostname type is supported with a maximum length of 255.
387 - The servername is rejected if too long or if it contains zeros,
388 in which case an fatal alert is generated.
389 - The servername field is maintained together with the session cache.
390 - When a session is resumed, the servername call back invoked in order
391 to allow the application to position itself to the right context.
392 - The servername is acknowledged if it is new for a session or when
393 it is identical to a previously used for the same session.
394 Applications can control the behaviour. They can at any time
395 set a 'desirable' servername for a new SSL object. This can be the
396 case for example with HTTPS when a Host: header field is received and
397 a renegotiation is requested. In this case, a possible servername
398 presented in the new client hello is only acknowledged if it matches
399 the value of the Host: field.
400 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
401 if they provide for changing an explicit servername context for the session,
402 i.e. when the session has been established with a servername extension.
403 - On session reconnect, the servername extension may be absent.
407 if (type == TLSEXT_TYPE_server_name)
409 unsigned char *sdata;
415 *al = SSL_AD_DECODE_ERROR;
422 *al = SSL_AD_DECODE_ERROR;
429 servname_type = *(sdata++);
435 *al = SSL_AD_DECODE_ERROR;
438 if (s->servername_done == 0)
439 switch (servname_type)
441 case TLSEXT_NAMETYPE_host_name:
442 if (s->session->tlsext_hostname == NULL)
444 if (len > TLSEXT_MAXLEN_host_name ||
445 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
447 *al = TLS1_AD_UNRECOGNIZED_NAME;
450 memcpy(s->session->tlsext_hostname, sdata, len);
451 s->session->tlsext_hostname[len]='\0';
452 if (strlen(s->session->tlsext_hostname) != len) {
453 OPENSSL_free(s->session->tlsext_hostname);
454 s->session->tlsext_hostname = NULL;
455 *al = TLS1_AD_UNRECOGNIZED_NAME;
458 s->servername_done = 1;
462 s->servername_done = strlen(s->session->tlsext_hostname) == len
463 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
475 *al = SSL_AD_DECODE_ERROR;
480 else if (type == TLSEXT_TYPE_renegotiate)
482 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
484 renegotiate_seen = 1;
486 else if (type == TLSEXT_TYPE_status_request
487 && s->ctx->tlsext_status_cb)
492 *al = SSL_AD_DECODE_ERROR;
496 s->tlsext_status_type = *data++;
498 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
500 const unsigned char *sdata;
502 /* Read in responder_id_list */
507 *al = SSL_AD_DECODE_ERROR;
516 *al = SSL_AD_DECODE_ERROR;
523 *al = SSL_AD_DECODE_ERROR;
528 id = d2i_OCSP_RESPID(NULL,
532 *al = SSL_AD_DECODE_ERROR;
537 OCSP_RESPID_free(id);
538 *al = SSL_AD_DECODE_ERROR;
541 if (!s->tlsext_ocsp_ids
542 && !(s->tlsext_ocsp_ids =
543 sk_OCSP_RESPID_new_null()))
545 OCSP_RESPID_free(id);
546 *al = SSL_AD_INTERNAL_ERROR;
549 if (!sk_OCSP_RESPID_push(
550 s->tlsext_ocsp_ids, id))
552 OCSP_RESPID_free(id);
553 *al = SSL_AD_INTERNAL_ERROR;
558 /* Read in request_extensions */
563 *al = SSL_AD_DECODE_ERROR;
569 s->tlsext_ocsp_exts =
570 d2i_X509_EXTENSIONS(NULL,
572 if (!s->tlsext_ocsp_exts
573 || (data + dsize != sdata))
575 *al = SSL_AD_DECODE_ERROR;
580 /* We don't know what to do with any other type
584 s->tlsext_status_type = -1;
587 /* session ticket processed earlier */
592 if (s->new_session && !renegotiate_seen
593 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
595 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
596 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
604 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
609 unsigned char *data = *p;
610 int tlsext_servername = 0;
611 int renegotiate_seen = 0;
615 /* Because the client does not see any renegotiation during an
616 attack, we must enforce this on all server hellos, even the
618 if (!(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
620 /* We should always see one extension: the renegotiate extension */
621 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
622 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
630 while(data <= (d+n-4))
635 if (data+size > (d+n))
638 if (s->tlsext_debug_cb)
639 s->tlsext_debug_cb(s, 1, type, data, size,
640 s->tlsext_debug_arg);
642 if (type == TLSEXT_TYPE_server_name)
644 if (s->tlsext_hostname == NULL || size > 0)
646 *al = TLS1_AD_UNRECOGNIZED_NAME;
649 tlsext_servername = 1;
651 else if (type == TLSEXT_TYPE_session_ticket)
653 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
656 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
659 s->tlsext_ticket_expected = 1;
661 else if (type == TLSEXT_TYPE_status_request)
663 /* MUST be empty and only sent if we've requested
664 * a status request message.
666 if ((s->tlsext_status_type == -1) || (size > 0))
668 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
671 /* Set flag to expect CertificateStatus message */
672 s->tlsext_status_expected = 1;
674 else if (type == TLSEXT_TYPE_renegotiate)
676 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
678 renegotiate_seen = 1;
685 *al = SSL_AD_DECODE_ERROR;
689 if (!renegotiate_seen
690 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
692 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
693 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
697 if (!s->hit && tlsext_servername == 1)
699 if (s->tlsext_hostname)
701 if (s->session->tlsext_hostname == NULL)
703 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
704 if (!s->session->tlsext_hostname)
706 *al = SSL_AD_UNRECOGNIZED_NAME;
712 *al = SSL_AD_DECODE_ERROR;
722 int ssl_check_clienthello_tlsext(SSL *s)
724 int ret=SSL_TLSEXT_ERR_NOACK;
725 int al = SSL_AD_UNRECOGNIZED_NAME;
727 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
728 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
729 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
730 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
732 /* If status request then ask callback what to do.
733 * Note: this must be called after servername callbacks in case
734 * the certificate has changed.
736 if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
739 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
742 /* We don't want to send a status request response */
743 case SSL_TLSEXT_ERR_NOACK:
744 s->tlsext_status_expected = 0;
746 /* status request response should be sent */
747 case SSL_TLSEXT_ERR_OK:
748 if (s->tlsext_ocsp_resp)
749 s->tlsext_status_expected = 1;
751 s->tlsext_status_expected = 0;
753 /* something bad happened */
754 case SSL_TLSEXT_ERR_ALERT_FATAL:
755 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
756 al = SSL_AD_INTERNAL_ERROR;
761 s->tlsext_status_expected = 0;
765 case SSL_TLSEXT_ERR_ALERT_FATAL:
766 ssl3_send_alert(s,SSL3_AL_FATAL,al);
769 case SSL_TLSEXT_ERR_ALERT_WARNING:
770 ssl3_send_alert(s,SSL3_AL_WARNING,al);
773 case SSL_TLSEXT_ERR_NOACK:
774 s->servername_done=0;
780 int ssl_check_serverhello_tlsext(SSL *s)
782 int ret=SSL_TLSEXT_ERR_NOACK;
783 int al = SSL_AD_UNRECOGNIZED_NAME;
785 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
786 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
787 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
788 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
790 /* If we've requested certificate status and we wont get one
793 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
794 && s->ctx->tlsext_status_cb)
797 /* Set resp to NULL, resplen to -1 so callback knows
798 * there is no response.
800 if (s->tlsext_ocsp_resp)
802 OPENSSL_free(s->tlsext_ocsp_resp);
803 s->tlsext_ocsp_resp = NULL;
805 s->tlsext_ocsp_resplen = -1;
806 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
809 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
810 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
814 al = SSL_AD_INTERNAL_ERROR;
815 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
821 case SSL_TLSEXT_ERR_ALERT_FATAL:
822 ssl3_send_alert(s,SSL3_AL_FATAL,al);
825 case SSL_TLSEXT_ERR_ALERT_WARNING:
826 ssl3_send_alert(s,SSL3_AL_WARNING,al);
829 case SSL_TLSEXT_ERR_NOACK:
830 s->servername_done=0;
836 /* Since the server cache lookup is done early on in the processing of client
837 * hello and other operations depend on the result we need to handle any TLS
838 * session ticket extension at the same time.
841 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
842 const unsigned char *limit, SSL_SESSION **ret)
844 /* Point after session ID in client hello */
845 const unsigned char *p = session_id + len;
848 /* If tickets disabled behave as if no ticket present
849 * to permit stateful resumption.
851 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
854 if ((s->version <= SSL3_VERSION) || !limit)
858 /* Skip past DTLS cookie */
859 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
866 /* Skip past cipher list */
871 /* Skip past compression algorithm list */
876 /* Now at start of extensions */
877 if ((p + 2) >= limit)
880 while ((p + 4) <= limit)
882 unsigned short type, size;
885 if (p + size > limit)
887 if (type == TLSEXT_TYPE_session_ticket)
889 /* If zero length note client will accept a ticket
890 * and indicate cache miss to trigger full handshake
894 s->tlsext_ticket_expected = 1;
895 return 0; /* Cache miss */
897 return tls_decrypt_ticket(s, p, size, session_id, len,
905 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
906 const unsigned char *sess_id, int sesslen,
911 const unsigned char *p;
912 int slen, mlen, renew_ticket = 0;
913 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
916 SSL_CTX *tctx = s->initial_ctx;
917 /* Need at least keyname + iv + some encrypted data */
920 /* Initialize session ticket encryption and HMAC contexts */
921 HMAC_CTX_init(&hctx);
922 EVP_CIPHER_CTX_init(&ctx);
923 if (tctx->tlsext_ticket_key_cb)
925 unsigned char *nctick = (unsigned char *)etick;
926 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
937 /* Check key name matches */
938 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
940 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
941 tlsext_tick_md(), NULL);
942 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
943 tctx->tlsext_tick_aes_key, etick + 16);
945 /* Attempt to process session ticket, first conduct sanity and
946 * integrity checks on ticket.
948 mlen = HMAC_size(&hctx);
950 /* Check HMAC of encrypted ticket */
951 HMAC_Update(&hctx, etick, eticklen);
952 HMAC_Final(&hctx, tick_hmac, NULL);
953 HMAC_CTX_cleanup(&hctx);
954 if (memcmp(tick_hmac, etick + eticklen, mlen))
956 /* Attempt to decrypt session data */
957 /* Move p after IV to start of encrypted ticket, update length */
958 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
959 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
960 sdec = OPENSSL_malloc(eticklen);
963 EVP_CIPHER_CTX_cleanup(&ctx);
966 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
967 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
970 EVP_CIPHER_CTX_cleanup(&ctx);
973 sess = d2i_SSL_SESSION(NULL, &p, slen);
977 /* The session ID if non-empty is used by some clients to
978 * detect that the ticket has been accepted. So we copy it to
979 * the session structure. If it is empty set length to zero
980 * as required by standard.
983 memcpy(sess->session_id, sess_id, sesslen);
984 sess->session_id_length = sesslen;
986 s->tlsext_ticket_expected = renew_ticket;
989 /* If session decrypt failure indicate a cache miss and set state to
993 s->tlsext_ticket_expected = 1;