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 = s->method->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;
278 /* don't add extensions for SSLv3 unless doing secure renegotiation */
279 if (s->client_version == SSL3_VERSION
280 && !s->s3->send_connection_binding)
285 if (ret>=limit) return NULL; /* this really never occurs, but ... */
287 if (s->tlsext_hostname != NULL)
289 /* Add TLS extension servername to the Client Hello message */
290 unsigned long size_str;
293 /* check for enough space.
294 4 for the servername type and entension length
295 2 for servernamelist length
296 1 for the hostname type
297 2 for hostname length
301 if ((lenmax = limit - ret - 9) < 0
302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
305 /* extension type and length */
306 s2n(TLSEXT_TYPE_server_name,ret);
309 /* length of servername list */
312 /* hostname type, length and hostname */
313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
315 memcpy(ret, s->tlsext_hostname, size_str);
319 /* Add RI if renegotiating */
324 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
326 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
330 if((limit - p - 4 - el) < 0) return NULL;
332 s2n(TLSEXT_TYPE_renegotiate,ret);
335 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
337 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
344 #ifndef OPENSSL_NO_EC
345 if (s->tlsext_ecpointformatlist != NULL &&
346 s->version != DTLS1_VERSION)
348 /* Add TLS extension ECPointFormats to the ClientHello message */
351 if ((lenmax = limit - ret - 5) < 0) return NULL;
352 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
353 if (s->tlsext_ecpointformatlist_length > 255)
355 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
359 s2n(TLSEXT_TYPE_ec_point_formats,ret);
360 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
361 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
362 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
363 ret+=s->tlsext_ecpointformatlist_length;
365 if (s->tlsext_ellipticcurvelist != NULL &&
366 s->version != DTLS1_VERSION)
368 /* Add TLS extension EllipticCurves to the ClientHello message */
371 if ((lenmax = limit - ret - 6) < 0) return NULL;
372 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
373 if (s->tlsext_ellipticcurvelist_length > 65532)
375 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
379 s2n(TLSEXT_TYPE_elliptic_curves,ret);
380 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
382 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
383 * elliptic_curve_list, but the examples use two bytes.
384 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
385 * resolves this to two bytes.
387 s2n(s->tlsext_ellipticcurvelist_length, ret);
388 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
389 ret+=s->tlsext_ellipticcurvelist_length;
391 #endif /* OPENSSL_NO_EC */
393 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
396 if (!s->new_session && s->session && s->session->tlsext_tick)
397 ticklen = s->session->tlsext_ticklen;
398 else if (s->session && s->tlsext_session_ticket &&
399 s->tlsext_session_ticket->data)
401 ticklen = s->tlsext_session_ticket->length;
402 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
403 if (!s->session->tlsext_tick)
405 memcpy(s->session->tlsext_tick,
406 s->tlsext_session_ticket->data,
408 s->session->tlsext_ticklen = ticklen;
412 if (ticklen == 0 && s->tlsext_session_ticket &&
413 s->tlsext_session_ticket->data == NULL)
415 /* Check for enough room 2 for extension type, 2 for len
418 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
419 s2n(TLSEXT_TYPE_session_ticket,ret);
423 memcpy(ret, s->session->tlsext_tick, ticklen);
429 #ifdef TLSEXT_TYPE_opaque_prf_input
430 if (s->s3->client_opaque_prf_input != NULL &&
431 s->version != DTLS1_VERSION)
433 size_t col = s->s3->client_opaque_prf_input_len;
435 if ((long)(limit - ret - 6 - col < 0))
437 if (col > 0xFFFD) /* can't happen */
440 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
443 memcpy(ret, s->s3->client_opaque_prf_input, col);
448 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
449 s->version != DTLS1_VERSION)
452 long extlen, idlen, itmp;
456 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
458 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
459 itmp = i2d_OCSP_RESPID(id, NULL);
465 if (s->tlsext_ocsp_exts)
467 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
474 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
475 s2n(TLSEXT_TYPE_status_request, ret);
476 if (extlen + idlen > 0xFFF0)
478 s2n(extlen + idlen + 5, ret);
479 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
481 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
483 /* save position of id len */
484 unsigned char *q = ret;
485 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
486 /* skip over id len */
488 itmp = i2d_OCSP_RESPID(id, &ret);
494 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
497 if ((extdatalen = ret-p-2)== 0)
504 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
507 unsigned char *ret = p;
509 /* don't add extensions for SSLv3, unless doing secure renegotiation */
510 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
514 if (ret>=limit) return NULL; /* this really never occurs, but ... */
516 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
518 if ((long)(limit - ret - 4) < 0) return NULL;
520 s2n(TLSEXT_TYPE_server_name,ret);
524 if(s->s3->send_connection_binding)
528 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
530 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
534 if((limit - p - 4 - el) < 0) return NULL;
536 s2n(TLSEXT_TYPE_renegotiate,ret);
539 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
541 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
548 #ifndef OPENSSL_NO_EC
549 if (s->tlsext_ecpointformatlist != NULL &&
550 s->version != DTLS1_VERSION)
552 /* Add TLS extension ECPointFormats to the ServerHello message */
555 if ((lenmax = limit - ret - 5) < 0) return NULL;
556 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
557 if (s->tlsext_ecpointformatlist_length > 255)
559 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
563 s2n(TLSEXT_TYPE_ec_point_formats,ret);
564 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
565 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
566 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
567 ret+=s->tlsext_ecpointformatlist_length;
570 /* Currently the server should not respond with a SupportedCurves extension */
571 #endif /* OPENSSL_NO_EC */
573 if (s->tlsext_ticket_expected
574 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
576 if ((long)(limit - ret - 4) < 0) return NULL;
577 s2n(TLSEXT_TYPE_session_ticket,ret);
581 if (s->tlsext_status_expected)
583 if ((long)(limit - ret - 4) < 0) return NULL;
584 s2n(TLSEXT_TYPE_status_request,ret);
588 #ifdef TLSEXT_TYPE_opaque_prf_input
589 if (s->s3->server_opaque_prf_input != NULL &&
590 s->version != DTLS1_VERSION)
592 size_t sol = s->s3->server_opaque_prf_input_len;
594 if ((long)(limit - ret - 6 - sol) < 0)
596 if (sol > 0xFFFD) /* can't happen */
599 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
602 memcpy(ret, s->s3->server_opaque_prf_input, sol);
606 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
607 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
608 { const unsigned char cryptopro_ext[36] = {
609 0xfd, 0xe8, /*65000*/
610 0x00, 0x20, /*32 bytes length*/
611 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
612 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
613 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
614 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
615 if (limit-ret<36) return NULL;
616 memcpy(ret,cryptopro_ext,36);
621 if ((extdatalen = ret-p-2)== 0)
628 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
633 unsigned char *data = *p;
634 int renegotiate_seen = 0;
636 s->servername_done = 0;
637 s->tlsext_status_type = -1;
643 if (data > (d+n-len))
646 while (data <= (d+n-4))
651 if (data+size > (d+n))
654 fprintf(stderr,"Received extension type %d size %d\n",type,size);
656 if (s->tlsext_debug_cb)
657 s->tlsext_debug_cb(s, 0, type, data, size,
658 s->tlsext_debug_arg);
659 /* The servername extension is treated as follows:
661 - Only the hostname type is supported with a maximum length of 255.
662 - The servername is rejected if too long or if it contains zeros,
663 in which case an fatal alert is generated.
664 - The servername field is maintained together with the session cache.
665 - When a session is resumed, the servername call back invoked in order
666 to allow the application to position itself to the right context.
667 - The servername is acknowledged if it is new for a session or when
668 it is identical to a previously used for the same session.
669 Applications can control the behaviour. They can at any time
670 set a 'desirable' servername for a new SSL object. This can be the
671 case for example with HTTPS when a Host: header field is received and
672 a renegotiation is requested. In this case, a possible servername
673 presented in the new client hello is only acknowledged if it matches
674 the value of the Host: field.
675 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
676 if they provide for changing an explicit servername context for the session,
677 i.e. when the session has been established with a servername extension.
678 - On session reconnect, the servername extension may be absent.
682 if (type == TLSEXT_TYPE_server_name)
684 unsigned char *sdata;
690 *al = SSL_AD_DECODE_ERROR;
697 *al = SSL_AD_DECODE_ERROR;
704 servname_type = *(sdata++);
710 *al = SSL_AD_DECODE_ERROR;
713 if (s->servername_done == 0)
714 switch (servname_type)
716 case TLSEXT_NAMETYPE_host_name:
717 if (s->session->tlsext_hostname == NULL)
719 if (len > TLSEXT_MAXLEN_host_name ||
720 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
722 *al = TLS1_AD_UNRECOGNIZED_NAME;
725 memcpy(s->session->tlsext_hostname, sdata, len);
726 s->session->tlsext_hostname[len]='\0';
727 if (strlen(s->session->tlsext_hostname) != len) {
728 OPENSSL_free(s->session->tlsext_hostname);
729 s->session->tlsext_hostname = NULL;
730 *al = TLS1_AD_UNRECOGNIZED_NAME;
733 s->servername_done = 1;
737 s->servername_done = strlen(s->session->tlsext_hostname) == len
738 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
750 *al = SSL_AD_DECODE_ERROR;
756 #ifndef OPENSSL_NO_EC
757 else if (type == TLSEXT_TYPE_ec_point_formats &&
758 s->version != DTLS1_VERSION)
760 unsigned char *sdata = data;
761 int ecpointformatlist_length = *(sdata++);
763 if (ecpointformatlist_length != size - 1)
765 *al = TLS1_AD_DECODE_ERROR;
768 s->session->tlsext_ecpointformatlist_length = 0;
769 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
770 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
772 *al = TLS1_AD_INTERNAL_ERROR;
775 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
776 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
778 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
779 sdata = s->session->tlsext_ecpointformatlist;
780 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
781 fprintf(stderr,"%i ",*(sdata++));
782 fprintf(stderr,"\n");
785 else if (type == TLSEXT_TYPE_elliptic_curves &&
786 s->version != DTLS1_VERSION)
788 unsigned char *sdata = data;
789 int ellipticcurvelist_length = (*(sdata++) << 8);
790 ellipticcurvelist_length += (*(sdata++));
792 if (ellipticcurvelist_length != size - 2)
794 *al = TLS1_AD_DECODE_ERROR;
797 s->session->tlsext_ellipticcurvelist_length = 0;
798 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
799 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
801 *al = TLS1_AD_INTERNAL_ERROR;
804 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
805 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
807 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
808 sdata = s->session->tlsext_ellipticcurvelist;
809 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
810 fprintf(stderr,"%i ",*(sdata++));
811 fprintf(stderr,"\n");
814 #endif /* OPENSSL_NO_EC */
815 #ifdef TLSEXT_TYPE_opaque_prf_input
816 else if (type == TLSEXT_TYPE_opaque_prf_input &&
817 s->version != DTLS1_VERSION)
819 unsigned char *sdata = data;
823 *al = SSL_AD_DECODE_ERROR;
826 n2s(sdata, s->s3->client_opaque_prf_input_len);
827 if (s->s3->client_opaque_prf_input_len != size - 2)
829 *al = SSL_AD_DECODE_ERROR;
833 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
834 OPENSSL_free(s->s3->client_opaque_prf_input);
835 if (s->s3->client_opaque_prf_input_len == 0)
836 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
838 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
839 if (s->s3->client_opaque_prf_input == NULL)
841 *al = TLS1_AD_INTERNAL_ERROR;
846 else if (type == TLSEXT_TYPE_session_ticket)
848 if (s->tls_session_ticket_ext_cb &&
849 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
851 *al = TLS1_AD_INTERNAL_ERROR;
855 else if (type == TLSEXT_TYPE_renegotiate)
857 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
859 renegotiate_seen = 1;
861 else if (type == TLSEXT_TYPE_status_request &&
862 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
867 *al = SSL_AD_DECODE_ERROR;
871 s->tlsext_status_type = *data++;
873 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
875 const unsigned char *sdata;
877 /* Read in responder_id_list */
882 *al = SSL_AD_DECODE_ERROR;
891 *al = SSL_AD_DECODE_ERROR;
898 *al = SSL_AD_DECODE_ERROR;
903 id = d2i_OCSP_RESPID(NULL,
907 *al = SSL_AD_DECODE_ERROR;
912 OCSP_RESPID_free(id);
913 *al = SSL_AD_DECODE_ERROR;
916 if (!s->tlsext_ocsp_ids
917 && !(s->tlsext_ocsp_ids =
918 sk_OCSP_RESPID_new_null()))
920 OCSP_RESPID_free(id);
921 *al = SSL_AD_INTERNAL_ERROR;
924 if (!sk_OCSP_RESPID_push(
925 s->tlsext_ocsp_ids, id))
927 OCSP_RESPID_free(id);
928 *al = SSL_AD_INTERNAL_ERROR;
933 /* Read in request_extensions */
938 *al = SSL_AD_DECODE_ERROR;
944 s->tlsext_ocsp_exts =
945 d2i_X509_EXTENSIONS(NULL,
947 if (!s->tlsext_ocsp_exts
948 || (data + dsize != sdata))
950 *al = SSL_AD_DECODE_ERROR;
955 /* We don't know what to do with any other type
959 s->tlsext_status_type = -1;
962 /* session ticket processed earlier */
970 /* Need RI if renegotiating */
972 if (!renegotiate_seen && s->renegotiate &&
973 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
975 *al = SSL_AD_HANDSHAKE_FAILURE;
976 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
977 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
984 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
986 unsigned short length;
989 unsigned char *data = *p;
990 int tlsext_servername = 0;
991 int renegotiate_seen = 0;
997 if (data+length != d+n)
999 *al = SSL_AD_DECODE_ERROR;
1003 while(data <= (d+n-4))
1008 if (data+size > (d+n))
1011 if (s->tlsext_debug_cb)
1012 s->tlsext_debug_cb(s, 1, type, data, size,
1013 s->tlsext_debug_arg);
1015 if (type == TLSEXT_TYPE_server_name)
1017 if (s->tlsext_hostname == NULL || size > 0)
1019 *al = TLS1_AD_UNRECOGNIZED_NAME;
1022 tlsext_servername = 1;
1025 #ifndef OPENSSL_NO_EC
1026 else if (type == TLSEXT_TYPE_ec_point_formats &&
1027 s->version != DTLS1_VERSION)
1029 unsigned char *sdata = data;
1030 int ecpointformatlist_length = *(sdata++);
1032 if (ecpointformatlist_length != size - 1)
1034 *al = TLS1_AD_DECODE_ERROR;
1037 s->session->tlsext_ecpointformatlist_length = 0;
1038 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1039 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1041 *al = TLS1_AD_INTERNAL_ERROR;
1044 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1045 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1047 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1048 sdata = s->session->tlsext_ecpointformatlist;
1049 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1050 fprintf(stderr,"%i ",*(sdata++));
1051 fprintf(stderr,"\n");
1054 #endif /* OPENSSL_NO_EC */
1056 else if (type == TLSEXT_TYPE_session_ticket)
1058 if (s->tls_session_ticket_ext_cb &&
1059 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1061 *al = TLS1_AD_INTERNAL_ERROR;
1064 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1067 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1070 s->tlsext_ticket_expected = 1;
1072 #ifdef TLSEXT_TYPE_opaque_prf_input
1073 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1074 s->version != DTLS1_VERSION)
1076 unsigned char *sdata = data;
1080 *al = SSL_AD_DECODE_ERROR;
1083 n2s(sdata, s->s3->server_opaque_prf_input_len);
1084 if (s->s3->server_opaque_prf_input_len != size - 2)
1086 *al = SSL_AD_DECODE_ERROR;
1090 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1091 OPENSSL_free(s->s3->server_opaque_prf_input);
1092 if (s->s3->server_opaque_prf_input_len == 0)
1093 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1095 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1097 if (s->s3->server_opaque_prf_input == NULL)
1099 *al = TLS1_AD_INTERNAL_ERROR;
1104 else if (type == TLSEXT_TYPE_status_request &&
1105 s->version != DTLS1_VERSION)
1107 /* MUST be empty and only sent if we've requested
1108 * a status request message.
1110 if ((s->tlsext_status_type == -1) || (size > 0))
1112 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1115 /* Set flag to expect CertificateStatus message */
1116 s->tlsext_status_expected = 1;
1118 else if (type == TLSEXT_TYPE_renegotiate)
1120 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1122 renegotiate_seen = 1;
1129 *al = SSL_AD_DECODE_ERROR;
1133 if (!s->hit && tlsext_servername == 1)
1135 if (s->tlsext_hostname)
1137 if (s->session->tlsext_hostname == NULL)
1139 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1140 if (!s->session->tlsext_hostname)
1142 *al = SSL_AD_UNRECOGNIZED_NAME;
1148 *al = SSL_AD_DECODE_ERROR;
1158 /* Determine if we need to see RI. Strictly speaking if we want to
1159 * avoid an attack we should *always* see RI even on initial server
1160 * hello because the client doesn't see any renegotiation during an
1161 * attack. However this would mean we could not connect to any server
1162 * which doesn't support RI so for the immediate future tolerate RI
1163 * absence on initial connect only.
1165 if (!renegotiate_seen
1166 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1167 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1169 *al = SSL_AD_HANDSHAKE_FAILURE;
1170 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1171 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1179 int ssl_prepare_clienthello_tlsext(SSL *s)
1181 #ifndef OPENSSL_NO_EC
1182 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1183 * and elliptic curves we support.
1188 unsigned long alg_k, alg_a;
1189 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1191 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1193 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1195 alg_k = c->algorithm_mkey;
1196 alg_a = c->algorithm_auth;
1197 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1203 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1206 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1207 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1209 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1212 s->tlsext_ecpointformatlist_length = 3;
1213 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1214 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1215 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1217 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1218 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1219 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1220 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1222 s->tlsext_ellipticcurvelist_length = 0;
1223 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1226 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1227 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1230 #endif /* OPENSSL_NO_EC */
1232 #ifdef TLSEXT_TYPE_opaque_prf_input
1236 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1238 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1243 if (s->tlsext_opaque_prf_input != NULL)
1245 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1246 OPENSSL_free(s->s3->client_opaque_prf_input);
1248 if (s->tlsext_opaque_prf_input_len == 0)
1249 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1251 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1252 if (s->s3->client_opaque_prf_input == NULL)
1254 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1257 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1261 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1262 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1269 int ssl_prepare_serverhello_tlsext(SSL *s)
1271 #ifndef OPENSSL_NO_EC
1272 /* If we are server and using an ECC cipher suite, send the point formats we support
1273 * if the client sent us an ECPointsFormat extension. Note that the server is not
1274 * supposed to send an EllipticCurves extension.
1277 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1278 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1279 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1280 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1284 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1285 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1287 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1290 s->tlsext_ecpointformatlist_length = 3;
1291 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1292 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1293 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1295 #endif /* OPENSSL_NO_EC */
1300 int ssl_check_clienthello_tlsext(SSL *s)
1302 int ret=SSL_TLSEXT_ERR_NOACK;
1303 int al = SSL_AD_UNRECOGNIZED_NAME;
1305 #ifndef OPENSSL_NO_EC
1306 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1307 * ssl3_choose_cipher in s3_lib.c.
1309 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1310 * ssl3_choose_cipher in s3_lib.c.
1314 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1315 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1316 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1317 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1319 /* If status request then ask callback what to do.
1320 * Note: this must be called after servername callbacks in case
1321 * the certificate has changed.
1323 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1326 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1329 /* We don't want to send a status request response */
1330 case SSL_TLSEXT_ERR_NOACK:
1331 s->tlsext_status_expected = 0;
1333 /* status request response should be sent */
1334 case SSL_TLSEXT_ERR_OK:
1335 if (s->tlsext_ocsp_resp)
1336 s->tlsext_status_expected = 1;
1338 s->tlsext_status_expected = 0;
1340 /* something bad happened */
1341 case SSL_TLSEXT_ERR_ALERT_FATAL:
1342 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1343 al = SSL_AD_INTERNAL_ERROR;
1348 s->tlsext_status_expected = 0;
1350 #ifdef TLSEXT_TYPE_opaque_prf_input
1352 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1353 * but we might be sending an alert in response to the client hello,
1354 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1358 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1360 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1363 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1364 al = SSL_AD_INTERNAL_ERROR;
1369 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1370 OPENSSL_free(s->s3->server_opaque_prf_input);
1371 s->s3->server_opaque_prf_input = NULL;
1373 if (s->tlsext_opaque_prf_input != NULL)
1375 if (s->s3->client_opaque_prf_input != NULL &&
1376 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1378 /* can only use this extension if we have a server opaque PRF input
1379 * of the same length as the client opaque PRF input! */
1381 if (s->tlsext_opaque_prf_input_len == 0)
1382 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1384 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1385 if (s->s3->server_opaque_prf_input == NULL)
1387 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1388 al = SSL_AD_INTERNAL_ERROR;
1391 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1395 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1397 /* The callback wants to enforce use of the extension,
1398 * but we can't do that with the client opaque PRF input;
1399 * abort the handshake.
1401 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1402 al = SSL_AD_HANDSHAKE_FAILURE;
1410 case SSL_TLSEXT_ERR_ALERT_FATAL:
1411 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1414 case SSL_TLSEXT_ERR_ALERT_WARNING:
1415 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1418 case SSL_TLSEXT_ERR_NOACK:
1419 s->servername_done=0;
1425 int ssl_check_serverhello_tlsext(SSL *s)
1427 int ret=SSL_TLSEXT_ERR_NOACK;
1428 int al = SSL_AD_UNRECOGNIZED_NAME;
1430 #ifndef OPENSSL_NO_EC
1431 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1432 * must return a an EC point formats lists containing uncompressed.
1434 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1435 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1436 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1437 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1439 /* we are using an ECC cipher */
1441 unsigned char *list;
1442 int found_uncompressed = 0;
1443 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1445 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1448 list = s->session->tlsext_ecpointformatlist;
1449 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1451 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1453 found_uncompressed = 1;
1457 if (!found_uncompressed)
1459 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1463 ret = SSL_TLSEXT_ERR_OK;
1464 #endif /* OPENSSL_NO_EC */
1466 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1467 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1468 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1469 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1471 #ifdef TLSEXT_TYPE_opaque_prf_input
1472 if (s->s3->server_opaque_prf_input_len > 0)
1474 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1475 * So first verify that we really have a value from the server too. */
1477 if (s->s3->server_opaque_prf_input == NULL)
1479 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1480 al = SSL_AD_HANDSHAKE_FAILURE;
1483 /* Anytime the server *has* sent an opaque PRF input, we need to check
1484 * that we have a client opaque PRF input of the same size. */
1485 if (s->s3->client_opaque_prf_input == NULL ||
1486 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1488 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1489 al = SSL_AD_ILLEGAL_PARAMETER;
1494 /* If we've requested certificate status and we wont get one
1497 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1498 && s->ctx && s->ctx->tlsext_status_cb)
1501 /* Set resp to NULL, resplen to -1 so callback knows
1502 * there is no response.
1504 if (s->tlsext_ocsp_resp)
1506 OPENSSL_free(s->tlsext_ocsp_resp);
1507 s->tlsext_ocsp_resp = NULL;
1509 s->tlsext_ocsp_resplen = -1;
1510 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1513 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1514 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1518 al = SSL_AD_INTERNAL_ERROR;
1519 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1525 case SSL_TLSEXT_ERR_ALERT_FATAL:
1526 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1529 case SSL_TLSEXT_ERR_ALERT_WARNING:
1530 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1533 case SSL_TLSEXT_ERR_NOACK:
1534 s->servername_done=0;
1540 /* Since the server cache lookup is done early on in the processing of client
1541 * hello and other operations depend on the result we need to handle any TLS
1542 * session ticket extension at the same time.
1545 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1546 const unsigned char *limit, SSL_SESSION **ret)
1548 /* Point after session ID in client hello */
1549 const unsigned char *p = session_id + len;
1552 /* If tickets disabled behave as if no ticket present
1553 * to permit stateful resumption.
1555 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1558 if ((s->version <= SSL3_VERSION) || !limit)
1562 /* Skip past DTLS cookie */
1563 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1570 /* Skip past cipher list */
1575 /* Skip past compression algorithm list */
1580 /* Now at start of extensions */
1581 if ((p + 2) >= limit)
1584 while ((p + 4) <= limit)
1586 unsigned short type, size;
1589 if (p + size > limit)
1591 if (type == TLSEXT_TYPE_session_ticket)
1593 /* If tickets disabled indicate cache miss which will
1594 * trigger a full handshake
1596 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1598 /* If zero length note client will accept a ticket
1599 * and indicate cache miss to trigger full handshake
1603 s->tlsext_ticket_expected = 1;
1604 return 0; /* Cache miss */
1606 if (s->tls_session_secret_cb)
1608 /* Indicate cache miss here and instead of
1609 * generating the session from ticket now,
1610 * trigger abbreviated handshake based on
1611 * external mechanism to calculate the master
1615 return tls_decrypt_ticket(s, p, size, session_id, len,
1623 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1624 const unsigned char *sess_id, int sesslen,
1625 SSL_SESSION **psess)
1628 unsigned char *sdec;
1629 const unsigned char *p;
1630 int slen, mlen, renew_ticket = 0;
1631 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1634 SSL_CTX *tctx = s->initial_ctx;
1635 /* Need at least keyname + iv + some encrypted data */
1638 /* Initialize session ticket encryption and HMAC contexts */
1639 HMAC_CTX_init(&hctx);
1640 EVP_CIPHER_CTX_init(&ctx);
1641 if (tctx->tlsext_ticket_key_cb)
1643 unsigned char *nctick = (unsigned char *)etick;
1644 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1655 /* Check key name matches */
1656 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1658 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1659 tlsext_tick_md(), NULL);
1660 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1661 tctx->tlsext_tick_aes_key, etick + 16);
1663 /* Attempt to process session ticket, first conduct sanity and
1664 * integrity checks on ticket.
1666 mlen = HMAC_size(&hctx);
1669 EVP_CIPHER_CTX_cleanup(&ctx);
1673 /* Check HMAC of encrypted ticket */
1674 HMAC_Update(&hctx, etick, eticklen);
1675 HMAC_Final(&hctx, tick_hmac, NULL);
1676 HMAC_CTX_cleanup(&hctx);
1677 if (memcmp(tick_hmac, etick + eticklen, mlen))
1679 /* Attempt to decrypt session data */
1680 /* Move p after IV to start of encrypted ticket, update length */
1681 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1682 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1683 sdec = OPENSSL_malloc(eticklen);
1686 EVP_CIPHER_CTX_cleanup(&ctx);
1689 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1690 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1693 EVP_CIPHER_CTX_cleanup(&ctx);
1696 sess = d2i_SSL_SESSION(NULL, &p, slen);
1700 /* The session ID if non-empty is used by some clients to
1701 * detect that the ticket has been accepted. So we copy it to
1702 * the session structure. If it is empty set length to zero
1703 * as required by standard.
1706 memcpy(sess->session_id, sess_id, sesslen);
1707 sess->session_id_length = sesslen;
1709 s->tlsext_ticket_expected = renew_ticket;
1712 /* If session decrypt failure indicate a cache miss and set state to
1716 s->tlsext_ticket_expected = 1;