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 RI if renegotiating */
183 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
185 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
189 if((limit - p - 4 - el) < 0) return NULL;
191 s2n(TLSEXT_TYPE_renegotiate,ret);
194 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
196 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
204 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
207 if (!s->new_session && s->session && s->session->tlsext_tick)
208 ticklen = s->session->tlsext_ticklen;
211 /* Check for enough room 2 for extension type, 2 for len
214 if (limit - ret - 4 - ticklen < 0)
216 s2n(TLSEXT_TYPE_session_ticket,ret);
220 memcpy(ret, s->session->tlsext_tick, ticklen);
225 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
226 s->version != DTLS1_VERSION)
229 long extlen, idlen, itmp;
233 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
235 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
236 itmp = i2d_OCSP_RESPID(id, NULL);
242 if (s->tlsext_ocsp_exts)
244 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
251 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
252 s2n(TLSEXT_TYPE_status_request, ret);
253 if (extlen + idlen > 0xFFF0)
255 s2n(extlen + idlen + 5, ret);
256 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
258 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
260 /* save position of id len */
261 unsigned char *q = ret;
262 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
263 /* skip over id len */
265 itmp = i2d_OCSP_RESPID(id, &ret);
271 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
274 if ((extdatalen = ret-p-2)== 0)
281 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
284 unsigned char *ret = p;
286 /* don't add extensions for SSLv3, unless doing secure renegotiation */
287 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
291 if (ret>=limit) return NULL; /* this really never occurs, but ... */
293 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
295 if (limit - ret - 4 < 0) return NULL;
297 s2n(TLSEXT_TYPE_server_name,ret);
301 if(s->s3->send_connection_binding)
305 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
307 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
311 if((limit - p - 4 - el) < 0) return NULL;
313 s2n(TLSEXT_TYPE_renegotiate,ret);
316 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
318 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
325 if (s->tlsext_ticket_expected
326 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
328 if (limit - ret - 4 < 0) return NULL;
329 s2n(TLSEXT_TYPE_session_ticket,ret);
333 if (s->tlsext_status_expected)
335 if ((long)(limit - ret - 4) < 0) return NULL;
336 s2n(TLSEXT_TYPE_status_request,ret);
340 if ((extdatalen = ret-p-2)== 0)
347 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
352 unsigned char *data = *p;
353 int renegotiate_seen = 0;
355 s->servername_done = 0;
356 s->tlsext_status_type = -1;
363 if (data > (d+n-len))
366 while (data <= (d+n-4))
371 if (data+size > (d+n))
374 if (s->tlsext_debug_cb)
375 s->tlsext_debug_cb(s, 0, type, data, size,
376 s->tlsext_debug_arg);
377 /* The servername extension is treated as follows:
379 - Only the hostname type is supported with a maximum length of 255.
380 - The servername is rejected if too long or if it contains zeros,
381 in which case an fatal alert is generated.
382 - The servername field is maintained together with the session cache.
383 - When a session is resumed, the servername call back invoked in order
384 to allow the application to position itself to the right context.
385 - The servername is acknowledged if it is new for a session or when
386 it is identical to a previously used for the same session.
387 Applications can control the behaviour. They can at any time
388 set a 'desirable' servername for a new SSL object. This can be the
389 case for example with HTTPS when a Host: header field is received and
390 a renegotiation is requested. In this case, a possible servername
391 presented in the new client hello is only acknowledged if it matches
392 the value of the Host: field.
393 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
394 if they provide for changing an explicit servername context for the session,
395 i.e. when the session has been established with a servername extension.
396 - On session reconnect, the servername extension may be absent.
400 if (type == TLSEXT_TYPE_server_name)
402 unsigned char *sdata;
408 *al = SSL_AD_DECODE_ERROR;
415 *al = SSL_AD_DECODE_ERROR;
422 servname_type = *(sdata++);
428 *al = SSL_AD_DECODE_ERROR;
431 if (s->servername_done == 0)
432 switch (servname_type)
434 case TLSEXT_NAMETYPE_host_name:
437 if(s->session->tlsext_hostname)
439 *al = SSL_AD_DECODE_ERROR;
442 if (len > TLSEXT_MAXLEN_host_name)
444 *al = TLS1_AD_UNRECOGNIZED_NAME;
447 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
449 *al = TLS1_AD_INTERNAL_ERROR;
452 memcpy(s->session->tlsext_hostname, sdata, len);
453 s->session->tlsext_hostname[len]='\0';
454 if (strlen(s->session->tlsext_hostname) != len) {
455 OPENSSL_free(s->session->tlsext_hostname);
456 s->session->tlsext_hostname = NULL;
457 *al = TLS1_AD_UNRECOGNIZED_NAME;
460 s->servername_done = 1;
464 s->servername_done = s->session->tlsext_hostname
465 && strlen(s->session->tlsext_hostname) == len
466 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
478 *al = SSL_AD_DECODE_ERROR;
483 else if (type == TLSEXT_TYPE_renegotiate)
485 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
487 renegotiate_seen = 1;
489 else if (type == TLSEXT_TYPE_status_request &&
490 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
495 *al = SSL_AD_DECODE_ERROR;
499 s->tlsext_status_type = *data++;
501 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
503 const unsigned char *sdata;
505 /* Read in responder_id_list */
510 *al = SSL_AD_DECODE_ERROR;
519 *al = SSL_AD_DECODE_ERROR;
527 *al = SSL_AD_DECODE_ERROR;
532 id = d2i_OCSP_RESPID(NULL,
536 *al = SSL_AD_DECODE_ERROR;
541 OCSP_RESPID_free(id);
542 *al = SSL_AD_DECODE_ERROR;
545 if (!s->tlsext_ocsp_ids
546 && !(s->tlsext_ocsp_ids =
547 sk_OCSP_RESPID_new_null()))
549 OCSP_RESPID_free(id);
550 *al = SSL_AD_INTERNAL_ERROR;
553 if (!sk_OCSP_RESPID_push(
554 s->tlsext_ocsp_ids, id))
556 OCSP_RESPID_free(id);
557 *al = SSL_AD_INTERNAL_ERROR;
562 /* Read in request_extensions */
565 *al = SSL_AD_DECODE_ERROR;
572 *al = SSL_AD_DECODE_ERROR;
578 if (s->tlsext_ocsp_exts)
580 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
581 X509_EXTENSION_free);
584 s->tlsext_ocsp_exts =
585 d2i_X509_EXTENSIONS(NULL,
587 if (!s->tlsext_ocsp_exts
588 || (data + dsize != sdata))
590 *al = SSL_AD_DECODE_ERROR;
595 /* We don't know what to do with any other type
599 s->tlsext_status_type = -1;
602 /* session ticket processed earlier */
610 /* Need RI if renegotiating */
612 if (!renegotiate_seen && s->new_session &&
613 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
615 *al = SSL_AD_HANDSHAKE_FAILURE;
616 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
617 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
624 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
626 unsigned short length;
629 unsigned char *data = *p;
630 int tlsext_servername = 0;
631 int renegotiate_seen = 0;
637 if (data+length != d+n)
639 *al = SSL_AD_DECODE_ERROR;
643 while(data <= (d+n-4))
648 if (data+size > (d+n))
651 if (s->tlsext_debug_cb)
652 s->tlsext_debug_cb(s, 1, type, data, size,
653 s->tlsext_debug_arg);
655 if (type == TLSEXT_TYPE_server_name)
657 if (s->tlsext_hostname == NULL || size > 0)
659 *al = TLS1_AD_UNRECOGNIZED_NAME;
662 tlsext_servername = 1;
664 else if (type == TLSEXT_TYPE_session_ticket)
666 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
669 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
672 s->tlsext_ticket_expected = 1;
674 else if (type == TLSEXT_TYPE_status_request &&
675 s->version != DTLS1_VERSION)
677 /* MUST be empty and only sent if we've requested
678 * a status request message.
680 if ((s->tlsext_status_type == -1) || (size > 0))
682 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
685 /* Set flag to expect CertificateStatus message */
686 s->tlsext_status_expected = 1;
688 else if (type == TLSEXT_TYPE_renegotiate)
690 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
692 renegotiate_seen = 1;
699 *al = SSL_AD_DECODE_ERROR;
703 if (!s->hit && tlsext_servername == 1)
705 if (s->tlsext_hostname)
707 if (s->session->tlsext_hostname == NULL)
709 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
710 if (!s->session->tlsext_hostname)
712 *al = SSL_AD_UNRECOGNIZED_NAME;
718 *al = SSL_AD_DECODE_ERROR;
728 /* Determine if we need to see RI. Strictly speaking if we want to
729 * avoid an attack we should *always* see RI even on initial server
730 * hello because the client doesn't see any renegotiation during an
731 * attack. However this would mean we could not connect to any server
732 * which doesn't support RI so for the immediate future tolerate RI
733 * absence on initial connect only.
735 if (!renegotiate_seen
736 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
737 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
739 *al = SSL_AD_HANDSHAKE_FAILURE;
740 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
741 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
748 int ssl_check_clienthello_tlsext_early(SSL *s)
750 int ret=SSL_TLSEXT_ERR_NOACK;
751 int al = SSL_AD_UNRECOGNIZED_NAME;
753 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
754 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
755 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
756 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
760 case SSL_TLSEXT_ERR_ALERT_FATAL:
761 ssl3_send_alert(s, SSL3_AL_FATAL, al);
764 case SSL_TLSEXT_ERR_ALERT_WARNING:
765 ssl3_send_alert(s, SSL3_AL_WARNING, al);
768 case SSL_TLSEXT_ERR_NOACK:
769 s->servername_done = 0;
776 int ssl_check_clienthello_tlsext_late(SSL *s)
778 int ret = SSL_TLSEXT_ERR_OK;
781 /* If status request then ask callback what to do.
782 * Note: this must be called after servername callbacks in case
783 * the certificate has changed, and must be called after the cipher
784 * has been chosen because this may influence which certificate is sent
786 if (s->tlsext_status_type != -1 && s->ctx && s->ctx->tlsext_status_cb)
790 certpkey = ssl_get_server_send_pkey(s);
791 /* If no certificate can't return certificate status */
792 if (certpkey == NULL)
794 s->tlsext_status_expected = 0;
797 /* Set current certificate to one we will use so
798 * SSL_get_certificate et al can pick it up.
800 s->cert->key = certpkey;
801 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
804 /* We don't want to send a status request response */
805 case SSL_TLSEXT_ERR_NOACK:
806 s->tlsext_status_expected = 0;
808 /* status request response should be sent */
809 case SSL_TLSEXT_ERR_OK:
810 if (s->tlsext_ocsp_resp)
811 s->tlsext_status_expected = 1;
813 s->tlsext_status_expected = 0;
815 /* something bad happened */
816 case SSL_TLSEXT_ERR_ALERT_FATAL:
817 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
818 al = SSL_AD_INTERNAL_ERROR;
823 s->tlsext_status_expected = 0;
828 case SSL_TLSEXT_ERR_ALERT_FATAL:
829 ssl3_send_alert(s,SSL3_AL_FATAL,al);
832 case SSL_TLSEXT_ERR_ALERT_WARNING:
833 ssl3_send_alert(s,SSL3_AL_WARNING,al);
841 int ssl_check_serverhello_tlsext(SSL *s)
843 int ret=SSL_TLSEXT_ERR_NOACK;
844 int al = SSL_AD_UNRECOGNIZED_NAME;
846 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
847 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
848 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
849 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
851 /* If we've requested certificate status and we wont get one
854 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
855 && s->ctx->tlsext_status_cb)
858 /* Set resp to NULL, resplen to -1 so callback knows
859 * there is no response.
861 if (s->tlsext_ocsp_resp)
863 OPENSSL_free(s->tlsext_ocsp_resp);
864 s->tlsext_ocsp_resp = NULL;
866 s->tlsext_ocsp_resplen = -1;
867 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
870 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
871 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
875 al = SSL_AD_INTERNAL_ERROR;
876 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
882 case SSL_TLSEXT_ERR_ALERT_FATAL:
883 ssl3_send_alert(s,SSL3_AL_FATAL,al);
886 case SSL_TLSEXT_ERR_ALERT_WARNING:
887 ssl3_send_alert(s,SSL3_AL_WARNING,al);
890 case SSL_TLSEXT_ERR_NOACK:
891 s->servername_done=0;
897 /* Since the server cache lookup is done early on in the processing of client
898 * hello and other operations depend on the result we need to handle any TLS
899 * session ticket extension at the same time.
902 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
903 const unsigned char *limit, SSL_SESSION **ret)
905 /* Point after session ID in client hello */
906 const unsigned char *p = session_id + len;
909 /* If tickets disabled behave as if no ticket present
910 * to permit stateful resumption.
912 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
915 if ((s->version <= SSL3_VERSION) || !limit)
919 /* Skip past DTLS cookie */
920 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
927 /* Skip past cipher list */
932 /* Skip past compression algorithm list */
937 /* Now at start of extensions */
938 if ((p + 2) >= limit)
941 while ((p + 4) <= limit)
943 unsigned short type, size;
946 if (p + size > limit)
948 if (type == TLSEXT_TYPE_session_ticket)
950 /* If zero length note client will accept a ticket
951 * and indicate cache miss to trigger full handshake
955 s->tlsext_ticket_expected = 1;
956 return 0; /* Cache miss */
958 return tls_decrypt_ticket(s, p, size, session_id, len,
966 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
967 const unsigned char *sess_id, int sesslen,
972 const unsigned char *p;
973 int slen, mlen, renew_ticket = 0;
974 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
977 SSL_CTX *tctx = s->initial_ctx;
978 /* Need at least keyname + iv + some encrypted data */
981 /* Initialize session ticket encryption and HMAC contexts */
982 HMAC_CTX_init(&hctx);
983 EVP_CIPHER_CTX_init(&ctx);
984 if (tctx->tlsext_ticket_key_cb)
986 unsigned char *nctick = (unsigned char *)etick;
987 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
998 /* Check key name matches */
999 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1001 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1002 tlsext_tick_md(), NULL);
1003 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1004 tctx->tlsext_tick_aes_key, etick + 16);
1006 /* Attempt to process session ticket, first conduct sanity and
1007 * integrity checks on ticket.
1009 mlen = HMAC_size(&hctx);
1011 /* Check HMAC of encrypted ticket */
1012 HMAC_Update(&hctx, etick, eticklen);
1013 HMAC_Final(&hctx, tick_hmac, NULL);
1014 HMAC_CTX_cleanup(&hctx);
1015 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
1017 /* Attempt to decrypt session data */
1018 /* Move p after IV to start of encrypted ticket, update length */
1019 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1020 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1021 sdec = OPENSSL_malloc(eticklen);
1024 EVP_CIPHER_CTX_cleanup(&ctx);
1027 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1028 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1031 EVP_CIPHER_CTX_cleanup(&ctx);
1034 sess = d2i_SSL_SESSION(NULL, &p, slen);
1038 /* The session ID if non-empty is used by some clients to
1039 * detect that the ticket has been accepted. So we copy it to
1040 * the session structure. If it is empty set length to zero
1041 * as required by standard.
1044 memcpy(sess->session_id, sess_id, sesslen);
1045 sess->session_id_length = sesslen;
1047 s->tlsext_ticket_expected = renew_ticket;
1050 /* If session decrypt failure indicate a cache miss and set state to
1054 s->tlsext_ticket_expected = 1;