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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include <openssl/ocsp.h>
117 #include "ssl_locl.h"
119 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
121 #ifndef OPENSSL_NO_TLSEXT
122 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
123 const unsigned char *sess_id, int sesslen,
124 SSL_SESSION **psess);
127 SSL3_ENC_METHOD TLSv1_enc_data={
130 tls1_setup_key_block,
131 tls1_generate_master_secret,
132 tls1_change_cipher_state,
133 tls1_final_finish_mac,
134 TLS1_FINISH_MAC_LENGTH,
135 tls1_cert_verify_mac,
136 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
137 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
141 long tls1_default_timeout(void)
143 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
144 * is way too long for http, the cache would over fill */
150 if (!ssl3_new(s)) return(0);
151 s->method->ssl_clear(s);
155 void tls1_free(SSL *s)
157 #ifndef OPENSSL_NO_TLSEXT
158 if (s->tlsext_session_ticket)
160 OPENSSL_free(s->tlsext_session_ticket);
162 #endif /* OPENSSL_NO_TLSEXT */
166 void tls1_clear(SSL *s)
169 s->version=TLS1_VERSION;
172 #ifndef OPENSSL_NO_EC
173 static int nid_list[] =
175 NID_sect163k1, /* sect163k1 (1) */
176 NID_sect163r1, /* sect163r1 (2) */
177 NID_sect163r2, /* sect163r2 (3) */
178 NID_sect193r1, /* sect193r1 (4) */
179 NID_sect193r2, /* sect193r2 (5) */
180 NID_sect233k1, /* sect233k1 (6) */
181 NID_sect233r1, /* sect233r1 (7) */
182 NID_sect239k1, /* sect239k1 (8) */
183 NID_sect283k1, /* sect283k1 (9) */
184 NID_sect283r1, /* sect283r1 (10) */
185 NID_sect409k1, /* sect409k1 (11) */
186 NID_sect409r1, /* sect409r1 (12) */
187 NID_sect571k1, /* sect571k1 (13) */
188 NID_sect571r1, /* sect571r1 (14) */
189 NID_secp160k1, /* secp160k1 (15) */
190 NID_secp160r1, /* secp160r1 (16) */
191 NID_secp160r2, /* secp160r2 (17) */
192 NID_secp192k1, /* secp192k1 (18) */
193 NID_X9_62_prime192v1, /* secp192r1 (19) */
194 NID_secp224k1, /* secp224k1 (20) */
195 NID_secp224r1, /* secp224r1 (21) */
196 NID_secp256k1, /* secp256k1 (22) */
197 NID_X9_62_prime256v1, /* secp256r1 (23) */
198 NID_secp384r1, /* secp384r1 (24) */
199 NID_secp521r1 /* secp521r1 (25) */
202 int tls1_ec_curve_id2nid(int curve_id)
204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
205 if ((curve_id < 1) || ((unsigned int)curve_id >
206 sizeof(nid_list)/sizeof(nid_list[0])))
208 return nid_list[curve_id-1];
211 int tls1_ec_nid2curve_id(int nid)
213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
216 case NID_sect163k1: /* sect163k1 (1) */
218 case NID_sect163r1: /* sect163r1 (2) */
220 case NID_sect163r2: /* sect163r2 (3) */
222 case NID_sect193r1: /* sect193r1 (4) */
224 case NID_sect193r2: /* sect193r2 (5) */
226 case NID_sect233k1: /* sect233k1 (6) */
228 case NID_sect233r1: /* sect233r1 (7) */
230 case NID_sect239k1: /* sect239k1 (8) */
232 case NID_sect283k1: /* sect283k1 (9) */
234 case NID_sect283r1: /* sect283r1 (10) */
236 case NID_sect409k1: /* sect409k1 (11) */
238 case NID_sect409r1: /* sect409r1 (12) */
240 case NID_sect571k1: /* sect571k1 (13) */
242 case NID_sect571r1: /* sect571r1 (14) */
244 case NID_secp160k1: /* secp160k1 (15) */
246 case NID_secp160r1: /* secp160r1 (16) */
248 case NID_secp160r2: /* secp160r2 (17) */
250 case NID_secp192k1: /* secp192k1 (18) */
252 case NID_X9_62_prime192v1: /* secp192r1 (19) */
254 case NID_secp224k1: /* secp224k1 (20) */
256 case NID_secp224r1: /* secp224r1 (21) */
258 case NID_secp256k1: /* secp256k1 (22) */
260 case NID_X9_62_prime256v1: /* secp256r1 (23) */
262 case NID_secp384r1: /* secp384r1 (24) */
264 case NID_secp521r1: /* secp521r1 (25) */
270 #endif /* OPENSSL_NO_EC */
272 #ifndef OPENSSL_NO_TLSEXT
273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
276 unsigned char *ret = p;
280 if (ret>=limit) return NULL; /* this really never occurs, but ... */
282 if (s->tlsext_hostname != NULL)
284 /* Add TLS extension servername to the Client Hello message */
285 unsigned long size_str;
288 /* check for enough space.
289 4 for the servername type and entension length
290 2 for servernamelist length
291 1 for the hostname type
292 2 for hostname length
296 if ((lenmax = limit - ret - 9) < 0
297 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
300 /* extension type and length */
301 s2n(TLSEXT_TYPE_server_name,ret);
304 /* length of servername list */
307 /* hostname type, length and hostname */
308 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
310 memcpy(ret, s->tlsext_hostname, size_str);
314 #ifndef OPENSSL_NO_EC
315 if (s->tlsext_ecpointformatlist != NULL)
317 /* Add TLS extension ECPointFormats to the ClientHello message */
320 if ((lenmax = limit - ret - 5) < 0) return NULL;
321 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
322 if (s->tlsext_ecpointformatlist_length > 255)
324 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
328 s2n(TLSEXT_TYPE_ec_point_formats,ret);
329 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
330 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
331 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
332 ret+=s->tlsext_ecpointformatlist_length;
334 if (s->tlsext_ellipticcurvelist != NULL)
336 /* Add TLS extension EllipticCurves to the ClientHello message */
339 if ((lenmax = limit - ret - 6) < 0) return NULL;
340 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
341 if (s->tlsext_ellipticcurvelist_length > 65532)
343 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
347 s2n(TLSEXT_TYPE_elliptic_curves,ret);
348 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
350 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
351 * elliptic_curve_list, but the examples use two bytes.
352 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
353 * resolves this to two bytes.
355 s2n(s->tlsext_ellipticcurvelist_length, ret);
356 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
357 ret+=s->tlsext_ellipticcurvelist_length;
359 #endif /* OPENSSL_NO_EC */
361 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
364 if (s->session && s->session->tlsext_tick)
365 ticklen = s->session->tlsext_ticklen;
366 else if (s->session && s->tlsext_session_ticket &&
367 s->tlsext_session_ticket->data)
369 ticklen = s->tlsext_session_ticket->length;
370 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
371 if (!s->session->tlsext_tick)
373 memcpy(s->session->tlsext_tick,
374 s->tlsext_session_ticket->data,
376 s->session->tlsext_ticklen = ticklen;
380 if (ticklen == 0 && s->tlsext_session_ticket &&
381 s->tlsext_session_ticket->data == NULL)
383 /* Check for enough room 2 for extension type, 2 for len
386 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
387 s2n(TLSEXT_TYPE_session_ticket,ret);
391 memcpy(ret, s->session->tlsext_tick, ticklen);
397 #ifdef TLSEXT_TYPE_opaque_prf_input
398 if (s->s3->client_opaque_prf_input != NULL)
400 size_t col = s->s3->client_opaque_prf_input_len;
402 if ((long)(limit - ret - 6 - col < 0))
404 if (col > 0xFFFD) /* can't happen */
407 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
410 memcpy(ret, s->s3->client_opaque_prf_input, col);
415 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
418 long extlen, idlen, itmp;
422 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
424 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
425 itmp = i2d_OCSP_RESPID(id, NULL);
431 if (s->tlsext_ocsp_exts)
433 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
440 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
441 s2n(TLSEXT_TYPE_status_request, ret);
442 if (extlen + idlen > 0xFFF0)
444 s2n(extlen + idlen + 5, ret);
445 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
447 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
449 /* save position of id len */
450 unsigned char *q = ret;
451 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
452 /* skip over id len */
454 itmp = i2d_OCSP_RESPID(id, &ret);
460 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
463 if ((extdatalen = ret-p-2)== 0)
470 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
473 unsigned char *ret = p;
476 if (ret>=limit) return NULL; /* this really never occurs, but ... */
478 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
480 if ((long)(limit - ret - 4) < 0) return NULL;
482 s2n(TLSEXT_TYPE_server_name,ret);
485 #ifndef OPENSSL_NO_EC
486 if (s->tlsext_ecpointformatlist != NULL)
488 /* Add TLS extension ECPointFormats to the ServerHello message */
491 if ((lenmax = limit - ret - 5) < 0) return NULL;
492 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
493 if (s->tlsext_ecpointformatlist_length > 255)
495 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
499 s2n(TLSEXT_TYPE_ec_point_formats,ret);
500 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
501 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
502 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
503 ret+=s->tlsext_ecpointformatlist_length;
506 /* Currently the server should not respond with a SupportedCurves extension */
507 #endif /* OPENSSL_NO_EC */
509 if (s->tlsext_ticket_expected
510 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
512 if ((long)(limit - ret - 4) < 0) return NULL;
513 s2n(TLSEXT_TYPE_session_ticket,ret);
517 if (s->tlsext_status_expected)
519 if ((long)(limit - ret - 4) < 0) return NULL;
520 s2n(TLSEXT_TYPE_status_request,ret);
524 #ifdef TLSEXT_TYPE_opaque_prf_input
525 if (s->s3->server_opaque_prf_input != NULL)
527 size_t sol = s->s3->server_opaque_prf_input_len;
529 if ((long)(limit - ret - 6 - sol) < 0)
531 if (sol > 0xFFFD) /* can't happen */
534 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
537 memcpy(ret, s->s3->server_opaque_prf_input, sol);
541 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
542 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
543 { const unsigned char cryptopro_ext[36] = {
544 0xfd, 0xe8, /*65000*/
545 0x00, 0x20, /*32 bytes length*/
546 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
547 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
548 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
549 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
550 if (limit-ret<36) return NULL;
551 memcpy(ret,cryptopro_ext,36);
556 if ((extdatalen = ret-p-2)== 0)
563 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
568 unsigned char *data = *p;
569 s->servername_done = 0;
570 s->tlsext_status_type = -1;
576 if (data > (d+n-len))
579 while (data <= (d+n-4))
584 if (data+size > (d+n))
587 fprintf(stderr,"Received extension type %d size %d\n",type,size);
589 if (s->tlsext_debug_cb)
590 s->tlsext_debug_cb(s, 0, type, data, size,
591 s->tlsext_debug_arg);
592 /* The servername extension is treated as follows:
594 - Only the hostname type is supported with a maximum length of 255.
595 - The servername is rejected if too long or if it contains zeros,
596 in which case an fatal alert is generated.
597 - The servername field is maintained together with the session cache.
598 - When a session is resumed, the servername call back invoked in order
599 to allow the application to position itself to the right context.
600 - The servername is acknowledged if it is new for a session or when
601 it is identical to a previously used for the same session.
602 Applications can control the behaviour. They can at any time
603 set a 'desirable' servername for a new SSL object. This can be the
604 case for example with HTTPS when a Host: header field is received and
605 a renegotiation is requested. In this case, a possible servername
606 presented in the new client hello is only acknowledged if it matches
607 the value of the Host: field.
608 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
609 if they provide for changing an explicit servername context for the session,
610 i.e. when the session has been established with a servername extension.
611 - On session reconnect, the servername extension may be absent.
615 if (type == TLSEXT_TYPE_server_name)
617 unsigned char *sdata;
623 *al = SSL_AD_DECODE_ERROR;
630 *al = SSL_AD_DECODE_ERROR;
637 servname_type = *(sdata++);
643 *al = SSL_AD_DECODE_ERROR;
646 if (s->servername_done == 0)
647 switch (servname_type)
649 case TLSEXT_NAMETYPE_host_name:
650 if (s->session->tlsext_hostname == NULL)
652 if (len > TLSEXT_MAXLEN_host_name ||
653 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
655 *al = TLS1_AD_UNRECOGNIZED_NAME;
658 memcpy(s->session->tlsext_hostname, sdata, len);
659 s->session->tlsext_hostname[len]='\0';
660 if (strlen(s->session->tlsext_hostname) != len) {
661 OPENSSL_free(s->session->tlsext_hostname);
662 s->session->tlsext_hostname = NULL;
663 *al = TLS1_AD_UNRECOGNIZED_NAME;
666 s->servername_done = 1;
670 s->servername_done = strlen(s->session->tlsext_hostname) == len
671 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
683 *al = SSL_AD_DECODE_ERROR;
689 #ifndef OPENSSL_NO_EC
690 else if (type == TLSEXT_TYPE_ec_point_formats)
692 unsigned char *sdata = data;
693 int ecpointformatlist_length = *(sdata++);
695 if (ecpointformatlist_length != size - 1)
697 *al = TLS1_AD_DECODE_ERROR;
700 s->session->tlsext_ecpointformatlist_length = 0;
701 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
702 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
704 *al = TLS1_AD_INTERNAL_ERROR;
707 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
708 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
710 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
711 sdata = s->session->tlsext_ecpointformatlist;
712 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
713 fprintf(stderr,"%i ",*(sdata++));
714 fprintf(stderr,"\n");
717 else if (type == TLSEXT_TYPE_elliptic_curves)
719 unsigned char *sdata = data;
720 int ellipticcurvelist_length = (*(sdata++) << 8);
721 ellipticcurvelist_length += (*(sdata++));
723 if (ellipticcurvelist_length != size - 2)
725 *al = TLS1_AD_DECODE_ERROR;
728 s->session->tlsext_ellipticcurvelist_length = 0;
729 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
730 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
732 *al = TLS1_AD_INTERNAL_ERROR;
735 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
736 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
738 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
739 sdata = s->session->tlsext_ellipticcurvelist;
740 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
741 fprintf(stderr,"%i ",*(sdata++));
742 fprintf(stderr,"\n");
745 #endif /* OPENSSL_NO_EC */
746 #ifdef TLSEXT_TYPE_opaque_prf_input
747 else if (type == TLSEXT_TYPE_opaque_prf_input)
749 unsigned char *sdata = data;
753 *al = SSL_AD_DECODE_ERROR;
756 n2s(sdata, s->s3->client_opaque_prf_input_len);
757 if (s->s3->client_opaque_prf_input_len != size - 2)
759 *al = SSL_AD_DECODE_ERROR;
763 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
764 OPENSSL_free(s->s3->client_opaque_prf_input);
765 if (s->s3->client_opaque_prf_input_len == 0)
766 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
768 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
769 if (s->s3->client_opaque_prf_input == NULL)
771 *al = TLS1_AD_INTERNAL_ERROR;
776 else if (type == TLSEXT_TYPE_session_ticket)
778 if (s->tls_session_ticket_ext_cb &&
779 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
781 *al = TLS1_AD_INTERNAL_ERROR;
785 else if (type == TLSEXT_TYPE_status_request
786 && s->ctx->tlsext_status_cb)
791 *al = SSL_AD_DECODE_ERROR;
795 s->tlsext_status_type = *data++;
797 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
799 const unsigned char *sdata;
801 /* Read in responder_id_list */
806 *al = SSL_AD_DECODE_ERROR;
815 *al = SSL_AD_DECODE_ERROR;
822 *al = SSL_AD_DECODE_ERROR;
827 id = d2i_OCSP_RESPID(NULL,
831 *al = SSL_AD_DECODE_ERROR;
836 OCSP_RESPID_free(id);
837 *al = SSL_AD_DECODE_ERROR;
840 if (!s->tlsext_ocsp_ids
841 && !(s->tlsext_ocsp_ids =
842 sk_OCSP_RESPID_new_null()))
844 OCSP_RESPID_free(id);
845 *al = SSL_AD_INTERNAL_ERROR;
848 if (!sk_OCSP_RESPID_push(
849 s->tlsext_ocsp_ids, id))
851 OCSP_RESPID_free(id);
852 *al = SSL_AD_INTERNAL_ERROR;
857 /* Read in request_extensions */
862 *al = SSL_AD_DECODE_ERROR;
868 s->tlsext_ocsp_exts =
869 d2i_X509_EXTENSIONS(NULL,
871 if (!s->tlsext_ocsp_exts
872 || (data + dsize != sdata))
874 *al = SSL_AD_DECODE_ERROR;
879 /* We don't know what to do with any other type
883 s->tlsext_status_type = -1;
886 /* session ticket processed earlier */
894 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
899 unsigned char *data = *p;
901 int tlsext_servername = 0;
908 while(data <= (d+n-4))
913 if (data+size > (d+n))
916 if (s->tlsext_debug_cb)
917 s->tlsext_debug_cb(s, 1, type, data, size,
918 s->tlsext_debug_arg);
920 if (type == TLSEXT_TYPE_server_name)
922 if (s->tlsext_hostname == NULL || size > 0)
924 *al = TLS1_AD_UNRECOGNIZED_NAME;
927 tlsext_servername = 1;
930 #ifndef OPENSSL_NO_EC
931 else if (type == TLSEXT_TYPE_ec_point_formats)
933 unsigned char *sdata = data;
934 int ecpointformatlist_length = *(sdata++);
936 if (ecpointformatlist_length != size - 1)
938 *al = TLS1_AD_DECODE_ERROR;
941 s->session->tlsext_ecpointformatlist_length = 0;
942 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
943 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
945 *al = TLS1_AD_INTERNAL_ERROR;
948 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
949 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
951 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
952 sdata = s->session->tlsext_ecpointformatlist;
953 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
954 fprintf(stderr,"%i ",*(sdata++));
955 fprintf(stderr,"\n");
958 #endif /* OPENSSL_NO_EC */
960 else if (type == TLSEXT_TYPE_session_ticket)
962 if (s->tls_session_ticket_ext_cb &&
963 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
965 *al = TLS1_AD_INTERNAL_ERROR;
968 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
971 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
974 s->tlsext_ticket_expected = 1;
976 #ifdef TLSEXT_TYPE_opaque_prf_input
977 else if (type == TLSEXT_TYPE_opaque_prf_input)
979 unsigned char *sdata = data;
983 *al = SSL_AD_DECODE_ERROR;
986 n2s(sdata, s->s3->server_opaque_prf_input_len);
987 if (s->s3->server_opaque_prf_input_len != size - 2)
989 *al = SSL_AD_DECODE_ERROR;
993 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
994 OPENSSL_free(s->s3->server_opaque_prf_input);
995 if (s->s3->server_opaque_prf_input_len == 0)
996 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
998 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1000 if (s->s3->server_opaque_prf_input == NULL)
1002 *al = TLS1_AD_INTERNAL_ERROR;
1007 else if (type == TLSEXT_TYPE_status_request)
1009 /* MUST be empty and only sent if we've requested
1010 * a status request message.
1012 if ((s->tlsext_status_type == -1) || (size > 0))
1014 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1017 /* Set flag to expect CertificateStatus message */
1018 s->tlsext_status_expected = 1;
1026 *al = SSL_AD_DECODE_ERROR;
1030 if (!s->hit && tlsext_servername == 1)
1032 if (s->tlsext_hostname)
1034 if (s->session->tlsext_hostname == NULL)
1036 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1037 if (!s->session->tlsext_hostname)
1039 *al = SSL_AD_UNRECOGNIZED_NAME;
1045 *al = SSL_AD_DECODE_ERROR;
1056 int ssl_prepare_clienthello_tlsext(SSL *s)
1058 #ifndef OPENSSL_NO_EC
1059 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1060 * and elliptic curves we support.
1065 unsigned long alg_k, alg_a;
1066 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1068 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1070 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1072 alg_k = c->algorithm_mkey;
1073 alg_a = c->algorithm_auth;
1074 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1080 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1083 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1084 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1086 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1089 s->tlsext_ecpointformatlist_length = 3;
1090 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1091 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1092 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1094 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1095 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1096 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1097 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1099 s->tlsext_ellipticcurvelist_length = 0;
1100 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1103 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1104 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1107 #endif /* OPENSSL_NO_EC */
1109 #ifdef TLSEXT_TYPE_opaque_prf_input
1113 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1115 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1120 if (s->tlsext_opaque_prf_input != NULL)
1122 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1123 OPENSSL_free(s->s3->client_opaque_prf_input);
1125 if (s->tlsext_opaque_prf_input_len == 0)
1126 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1128 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1129 if (s->s3->client_opaque_prf_input == NULL)
1131 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1134 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1138 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1139 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1146 int ssl_prepare_serverhello_tlsext(SSL *s)
1148 #ifndef OPENSSL_NO_EC
1149 /* If we are server and using an ECC cipher suite, send the point formats we support
1150 * if the client sent us an ECPointsFormat extension. Note that the server is not
1151 * supposed to send an EllipticCurves extension.
1154 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1155 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1156 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1157 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1161 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1162 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1164 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1167 s->tlsext_ecpointformatlist_length = 3;
1168 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1169 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1170 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1172 #endif /* OPENSSL_NO_EC */
1177 int ssl_check_clienthello_tlsext(SSL *s)
1179 int ret=SSL_TLSEXT_ERR_NOACK;
1180 int al = SSL_AD_UNRECOGNIZED_NAME;
1182 #ifndef OPENSSL_NO_EC
1183 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1184 * ssl3_choose_cipher in s3_lib.c.
1186 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1187 * ssl3_choose_cipher in s3_lib.c.
1191 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1192 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1193 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1194 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1196 /* If status request then ask callback what to do.
1197 * Note: this must be called after servername callbacks in case
1198 * the certificate has changed.
1200 if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
1203 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1206 /* We don't want to send a status request response */
1207 case SSL_TLSEXT_ERR_NOACK:
1208 s->tlsext_status_expected = 0;
1210 /* status request response should be sent */
1211 case SSL_TLSEXT_ERR_OK:
1212 if (s->tlsext_ocsp_resp)
1213 s->tlsext_status_expected = 1;
1215 s->tlsext_status_expected = 0;
1217 /* something bad happened */
1218 case SSL_TLSEXT_ERR_ALERT_FATAL:
1219 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1220 al = SSL_AD_INTERNAL_ERROR;
1225 s->tlsext_status_expected = 0;
1227 #ifdef TLSEXT_TYPE_opaque_prf_input
1229 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1230 * but we might be sending an alert in response to the client hello,
1231 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1235 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1237 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1240 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1241 al = SSL_AD_INTERNAL_ERROR;
1246 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1247 OPENSSL_free(s->s3->server_opaque_prf_input);
1248 s->s3->server_opaque_prf_input = NULL;
1250 if (s->tlsext_opaque_prf_input != NULL)
1252 if (s->s3->client_opaque_prf_input != NULL &&
1253 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1255 /* can only use this extension if we have a server opaque PRF input
1256 * of the same length as the client opaque PRF input! */
1258 if (s->tlsext_opaque_prf_input_len == 0)
1259 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1261 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1262 if (s->s3->server_opaque_prf_input == NULL)
1264 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1265 al = SSL_AD_INTERNAL_ERROR;
1268 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1272 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1274 /* The callback wants to enforce use of the extension,
1275 * but we can't do that with the client opaque PRF input;
1276 * abort the handshake.
1278 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1279 al = SSL_AD_HANDSHAKE_FAILURE;
1287 case SSL_TLSEXT_ERR_ALERT_FATAL:
1288 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1291 case SSL_TLSEXT_ERR_ALERT_WARNING:
1292 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1295 case SSL_TLSEXT_ERR_NOACK:
1296 s->servername_done=0;
1302 int ssl_check_serverhello_tlsext(SSL *s)
1304 int ret=SSL_TLSEXT_ERR_NOACK;
1305 int al = SSL_AD_UNRECOGNIZED_NAME;
1307 #ifndef OPENSSL_NO_EC
1308 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1309 * must return a an EC point formats lists containing uncompressed.
1311 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1312 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1313 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1314 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1316 /* we are using an ECC cipher */
1318 unsigned char *list;
1319 int found_uncompressed = 0;
1320 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1322 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1325 list = s->session->tlsext_ecpointformatlist;
1326 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1328 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1330 found_uncompressed = 1;
1334 if (!found_uncompressed)
1336 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1340 ret = SSL_TLSEXT_ERR_OK;
1341 #endif /* OPENSSL_NO_EC */
1343 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1344 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1345 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1346 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1348 #ifdef TLSEXT_TYPE_opaque_prf_input
1349 if (s->s3->server_opaque_prf_input_len > 0)
1351 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1352 * So first verify that we really have a value from the server too. */
1354 if (s->s3->server_opaque_prf_input == NULL)
1356 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1357 al = SSL_AD_HANDSHAKE_FAILURE;
1360 /* Anytime the server *has* sent an opaque PRF input, we need to check
1361 * that we have a client opaque PRF input of the same size. */
1362 if (s->s3->client_opaque_prf_input == NULL ||
1363 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1365 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1366 al = SSL_AD_ILLEGAL_PARAMETER;
1371 /* If we've requested certificate status and we wont get one
1374 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1375 && s->ctx->tlsext_status_cb)
1378 /* Set resp to NULL, resplen to -1 so callback knows
1379 * there is no response.
1381 if (s->tlsext_ocsp_resp)
1383 OPENSSL_free(s->tlsext_ocsp_resp);
1384 s->tlsext_ocsp_resp = NULL;
1386 s->tlsext_ocsp_resplen = -1;
1387 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1390 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1391 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1395 al = SSL_AD_INTERNAL_ERROR;
1396 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1402 case SSL_TLSEXT_ERR_ALERT_FATAL:
1403 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1406 case SSL_TLSEXT_ERR_ALERT_WARNING:
1407 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1410 case SSL_TLSEXT_ERR_NOACK:
1411 s->servername_done=0;
1417 /* Since the server cache lookup is done early on in the processing of client
1418 * hello and other operations depend on the result we need to handle any TLS
1419 * session ticket extension at the same time.
1422 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1423 const unsigned char *limit, SSL_SESSION **ret)
1425 /* Point after session ID in client hello */
1426 const unsigned char *p = session_id + len;
1429 /* If tickets disabled behave as if no ticket present
1430 * to permit stateful resumption.
1432 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1435 if ((s->version <= SSL3_VERSION) || !limit)
1439 /* Skip past cipher list */
1444 /* Skip past compression algorithm list */
1449 /* Now at start of extensions */
1450 if ((p + 2) >= limit)
1453 while ((p + 4) <= limit)
1455 unsigned short type, size;
1458 if (p + size > limit)
1460 if (type == TLSEXT_TYPE_session_ticket)
1462 /* If tickets disabled indicate cache miss which will
1463 * trigger a full handshake
1465 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1467 /* If zero length note client will accept a ticket
1468 * and indicate cache miss to trigger full handshake
1472 s->tlsext_ticket_expected = 1;
1473 return 0; /* Cache miss */
1475 if (s->tls_session_secret_cb)
1477 /* Indicate cache miss here and instead of
1478 * generating the session from ticket now,
1479 * trigger abbreviated handshake based on
1480 * external mechanism to calculate the master
1484 return tls_decrypt_ticket(s, p, size, session_id, len,
1492 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1493 const unsigned char *sess_id, int sesslen,
1494 SSL_SESSION **psess)
1497 unsigned char *sdec;
1498 const unsigned char *p;
1499 int slen, mlen, renew_ticket = 0;
1500 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1503 /* Need at least keyname + iv + some encrypted data */
1506 /* Initialize session ticket encryption and HMAC contexts */
1507 HMAC_CTX_init(&hctx);
1508 EVP_CIPHER_CTX_init(&ctx);
1509 if (s->ctx->tlsext_ticket_key_cb)
1511 unsigned char *nctick = (unsigned char *)etick;
1512 int rv = s->ctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1523 /* Check key name matches */
1524 if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
1526 HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
1527 tlsext_tick_md(), NULL);
1528 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1529 s->ctx->tlsext_tick_aes_key, etick + 16);
1531 /* Attempt to process session ticket, first conduct sanity and
1532 * integrity checks on ticket.
1534 mlen = HMAC_size(&hctx);
1536 /* Check HMAC of encrypted ticket */
1537 HMAC_Update(&hctx, etick, eticklen);
1538 HMAC_Final(&hctx, tick_hmac, NULL);
1539 HMAC_CTX_cleanup(&hctx);
1540 if (memcmp(tick_hmac, etick + eticklen, mlen))
1542 /* Attempt to decrypt session data */
1543 /* Move p after IV to start of encrypted ticket, update length */
1544 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1545 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1546 sdec = OPENSSL_malloc(eticklen);
1549 EVP_CIPHER_CTX_cleanup(&ctx);
1552 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1553 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1556 EVP_CIPHER_CTX_cleanup(&ctx);
1559 sess = d2i_SSL_SESSION(NULL, &p, slen);
1563 /* The session ID if non-empty is used by some clients to
1564 * detect that the ticket has been accepted. So we copy it to
1565 * the session structure. If it is empty set length to zero
1566 * as required by standard.
1569 memcpy(sess->session_id, sess_id, sesslen);
1570 sess->session_id_length = sesslen;
1572 s->tlsext_ticket_expected = renew_ticket;
1575 /* If session decrypt failure indicate a cache miss and set state to
1579 s->tlsext_ticket_expected = 1;