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;
278 /* don't add extensions for SSLv3 */
279 if (s->client_version == SSL3_VERSION)
284 if (ret>=limit) return NULL; /* this really never occurs, but ... */
286 if (s->tlsext_hostname != NULL)
288 /* Add TLS extension servername to the Client Hello message */
289 unsigned long size_str;
292 /* check for enough space.
293 4 for the servername type and entension length
294 2 for servernamelist length
295 1 for the hostname type
296 2 for hostname length
300 if ((lenmax = limit - ret - 9) < 0
301 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
304 /* extension type and length */
305 s2n(TLSEXT_TYPE_server_name,ret);
308 /* length of servername list */
311 /* hostname type, length and hostname */
312 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
314 memcpy(ret, s->tlsext_hostname, size_str);
318 /* Add the renegotiation option: TODOEKR switch */
322 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
324 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
328 if((limit - p - 4 - el) < 0) return NULL;
330 s2n(TLSEXT_TYPE_renegotiate,ret);
333 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
335 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
342 #ifndef OPENSSL_NO_EC
343 if (s->tlsext_ecpointformatlist != NULL)
345 /* Add TLS extension ECPointFormats to the ClientHello message */
348 if ((lenmax = limit - ret - 5) < 0) return NULL;
349 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
350 if (s->tlsext_ecpointformatlist_length > 255)
352 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
356 s2n(TLSEXT_TYPE_ec_point_formats,ret);
357 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
358 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
359 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
360 ret+=s->tlsext_ecpointformatlist_length;
362 if (s->tlsext_ellipticcurvelist != NULL)
364 /* Add TLS extension EllipticCurves to the ClientHello message */
367 if ((lenmax = limit - ret - 6) < 0) return NULL;
368 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
369 if (s->tlsext_ellipticcurvelist_length > 65532)
371 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
375 s2n(TLSEXT_TYPE_elliptic_curves,ret);
376 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
378 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
379 * elliptic_curve_list, but the examples use two bytes.
380 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
381 * resolves this to two bytes.
383 s2n(s->tlsext_ellipticcurvelist_length, ret);
384 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
385 ret+=s->tlsext_ellipticcurvelist_length;
387 #endif /* OPENSSL_NO_EC */
389 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
392 if (!s->new_session && s->session && s->session->tlsext_tick)
393 ticklen = s->session->tlsext_ticklen;
394 else if (s->session && s->tlsext_session_ticket &&
395 s->tlsext_session_ticket->data)
397 ticklen = s->tlsext_session_ticket->length;
398 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
399 if (!s->session->tlsext_tick)
401 memcpy(s->session->tlsext_tick,
402 s->tlsext_session_ticket->data,
404 s->session->tlsext_ticklen = ticklen;
408 if (ticklen == 0 && s->tlsext_session_ticket &&
409 s->tlsext_session_ticket->data == NULL)
411 /* Check for enough room 2 for extension type, 2 for len
414 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
415 s2n(TLSEXT_TYPE_session_ticket,ret);
419 memcpy(ret, s->session->tlsext_tick, ticklen);
425 #ifdef TLSEXT_TYPE_opaque_prf_input
426 if (s->s3->client_opaque_prf_input != NULL)
428 size_t col = s->s3->client_opaque_prf_input_len;
430 if ((long)(limit - ret - 6 - col < 0))
432 if (col > 0xFFFD) /* can't happen */
435 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
438 memcpy(ret, s->s3->client_opaque_prf_input, col);
443 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
446 long extlen, idlen, itmp;
450 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
452 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
453 itmp = i2d_OCSP_RESPID(id, NULL);
459 if (s->tlsext_ocsp_exts)
461 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
468 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
469 s2n(TLSEXT_TYPE_status_request, ret);
470 if (extlen + idlen > 0xFFF0)
472 s2n(extlen + idlen + 5, ret);
473 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
475 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
477 /* save position of id len */
478 unsigned char *q = ret;
479 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
480 /* skip over id len */
482 itmp = i2d_OCSP_RESPID(id, &ret);
488 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
491 if ((extdatalen = ret-p-2)== 0)
498 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
501 unsigned char *ret = p;
503 /* don't add extensions for SSLv3 */
504 if (s->version == SSL3_VERSION)
508 if (ret>=limit) return NULL; /* this really never occurs, but ... */
510 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
512 if ((long)(limit - ret - 4) < 0) return NULL;
514 s2n(TLSEXT_TYPE_server_name,ret);
518 if(s->s3->send_connection_binding)
522 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
524 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
528 if((limit - p - 4 - el) < 0) return NULL;
530 s2n(TLSEXT_TYPE_renegotiate,ret);
533 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
535 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
542 #ifndef OPENSSL_NO_EC
543 if (s->tlsext_ecpointformatlist != NULL)
545 /* Add TLS extension ECPointFormats to the ServerHello message */
548 if ((lenmax = limit - ret - 5) < 0) return NULL;
549 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
550 if (s->tlsext_ecpointformatlist_length > 255)
552 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
556 s2n(TLSEXT_TYPE_ec_point_formats,ret);
557 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
558 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
559 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
560 ret+=s->tlsext_ecpointformatlist_length;
563 /* Currently the server should not respond with a SupportedCurves extension */
564 #endif /* OPENSSL_NO_EC */
566 if (s->tlsext_ticket_expected
567 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
569 if ((long)(limit - ret - 4) < 0) return NULL;
570 s2n(TLSEXT_TYPE_session_ticket,ret);
574 if (s->tlsext_status_expected)
576 if ((long)(limit - ret - 4) < 0) return NULL;
577 s2n(TLSEXT_TYPE_status_request,ret);
581 #ifdef TLSEXT_TYPE_opaque_prf_input
582 if (s->s3->server_opaque_prf_input != NULL)
584 size_t sol = s->s3->server_opaque_prf_input_len;
586 if ((long)(limit - ret - 6 - sol) < 0)
588 if (sol > 0xFFFD) /* can't happen */
591 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
594 memcpy(ret, s->s3->server_opaque_prf_input, sol);
598 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
599 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
600 { const unsigned char cryptopro_ext[36] = {
601 0xfd, 0xe8, /*65000*/
602 0x00, 0x20, /*32 bytes length*/
603 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
604 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
605 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
606 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
607 if (limit-ret<36) return NULL;
608 memcpy(ret,cryptopro_ext,36);
613 if ((extdatalen = ret-p-2)== 0)
620 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
625 unsigned char *data = *p;
626 int renegotiate_seen = 0;
628 s->servername_done = 0;
629 s->tlsext_status_type = -1;
630 s->s3->send_connection_binding = 0;
635 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
637 /* We should always see one extension: the renegotiate extension */
638 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
639 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
646 if (data > (d+n-len))
649 while (data <= (d+n-4))
654 if (data+size > (d+n))
657 fprintf(stderr,"Received extension type %d size %d\n",type,size);
659 if (s->tlsext_debug_cb)
660 s->tlsext_debug_cb(s, 0, type, data, size,
661 s->tlsext_debug_arg);
662 /* The servername extension is treated as follows:
664 - Only the hostname type is supported with a maximum length of 255.
665 - The servername is rejected if too long or if it contains zeros,
666 in which case an fatal alert is generated.
667 - The servername field is maintained together with the session cache.
668 - When a session is resumed, the servername call back invoked in order
669 to allow the application to position itself to the right context.
670 - The servername is acknowledged if it is new for a session or when
671 it is identical to a previously used for the same session.
672 Applications can control the behaviour. They can at any time
673 set a 'desirable' servername for a new SSL object. This can be the
674 case for example with HTTPS when a Host: header field is received and
675 a renegotiation is requested. In this case, a possible servername
676 presented in the new client hello is only acknowledged if it matches
677 the value of the Host: field.
678 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
679 if they provide for changing an explicit servername context for the session,
680 i.e. when the session has been established with a servername extension.
681 - On session reconnect, the servername extension may be absent.
685 if (type == TLSEXT_TYPE_server_name)
687 unsigned char *sdata;
693 *al = SSL_AD_DECODE_ERROR;
700 *al = SSL_AD_DECODE_ERROR;
707 servname_type = *(sdata++);
713 *al = SSL_AD_DECODE_ERROR;
716 if (s->servername_done == 0)
717 switch (servname_type)
719 case TLSEXT_NAMETYPE_host_name:
720 if (s->session->tlsext_hostname == NULL)
722 if (len > TLSEXT_MAXLEN_host_name ||
723 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
725 *al = TLS1_AD_UNRECOGNIZED_NAME;
728 memcpy(s->session->tlsext_hostname, sdata, len);
729 s->session->tlsext_hostname[len]='\0';
730 if (strlen(s->session->tlsext_hostname) != len) {
731 OPENSSL_free(s->session->tlsext_hostname);
732 s->session->tlsext_hostname = NULL;
733 *al = TLS1_AD_UNRECOGNIZED_NAME;
736 s->servername_done = 1;
740 s->servername_done = strlen(s->session->tlsext_hostname) == len
741 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
753 *al = SSL_AD_DECODE_ERROR;
759 #ifndef OPENSSL_NO_EC
760 else if (type == TLSEXT_TYPE_ec_point_formats)
762 unsigned char *sdata = data;
763 int ecpointformatlist_length = *(sdata++);
765 if (ecpointformatlist_length != size - 1)
767 *al = TLS1_AD_DECODE_ERROR;
770 s->session->tlsext_ecpointformatlist_length = 0;
771 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
772 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
774 *al = TLS1_AD_INTERNAL_ERROR;
777 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
778 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
780 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
781 sdata = s->session->tlsext_ecpointformatlist;
782 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
783 fprintf(stderr,"%i ",*(sdata++));
784 fprintf(stderr,"\n");
787 else if (type == TLSEXT_TYPE_elliptic_curves)
789 unsigned char *sdata = data;
790 int ellipticcurvelist_length = (*(sdata++) << 8);
791 ellipticcurvelist_length += (*(sdata++));
793 if (ellipticcurvelist_length != size - 2)
795 *al = TLS1_AD_DECODE_ERROR;
798 s->session->tlsext_ellipticcurvelist_length = 0;
799 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
800 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
802 *al = TLS1_AD_INTERNAL_ERROR;
805 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
806 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
808 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
809 sdata = s->session->tlsext_ellipticcurvelist;
810 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
811 fprintf(stderr,"%i ",*(sdata++));
812 fprintf(stderr,"\n");
815 #endif /* OPENSSL_NO_EC */
816 #ifdef TLSEXT_TYPE_opaque_prf_input
817 else if (type == TLSEXT_TYPE_opaque_prf_input)
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->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 */
966 if (s->new_session && !renegotiate_seen
967 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
969 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
970 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
979 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
984 unsigned char *data = *p;
985 int tlsext_servername = 0;
986 int renegotiate_seen = 0;
990 /* Because the client does not see any renegotiation during an
991 attack, we must enforce this on all server hellos, even the
993 if (!(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
995 /* We should always see one extension: the renegotiate extension */
996 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
997 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1005 while(data <= (d+n-4))
1010 if (data+size > (d+n))
1013 if (s->tlsext_debug_cb)
1014 s->tlsext_debug_cb(s, 1, type, data, size,
1015 s->tlsext_debug_arg);
1017 if (type == TLSEXT_TYPE_server_name)
1019 if (s->tlsext_hostname == NULL || size > 0)
1021 *al = TLS1_AD_UNRECOGNIZED_NAME;
1024 tlsext_servername = 1;
1027 #ifndef OPENSSL_NO_EC
1028 else if (type == TLSEXT_TYPE_ec_point_formats)
1030 unsigned char *sdata = data;
1031 int ecpointformatlist_length = *(sdata++);
1033 if (ecpointformatlist_length != size - 1)
1035 *al = TLS1_AD_DECODE_ERROR;
1038 s->session->tlsext_ecpointformatlist_length = 0;
1039 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1040 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1042 *al = TLS1_AD_INTERNAL_ERROR;
1045 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1046 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1048 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1049 sdata = s->session->tlsext_ecpointformatlist;
1050 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1051 fprintf(stderr,"%i ",*(sdata++));
1052 fprintf(stderr,"\n");
1055 #endif /* OPENSSL_NO_EC */
1057 else if (type == TLSEXT_TYPE_session_ticket)
1059 if (s->tls_session_ticket_ext_cb &&
1060 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1062 *al = TLS1_AD_INTERNAL_ERROR;
1065 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1068 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1071 s->tlsext_ticket_expected = 1;
1073 #ifdef TLSEXT_TYPE_opaque_prf_input
1074 else if (type == TLSEXT_TYPE_opaque_prf_input)
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)
1106 /* MUST be empty and only sent if we've requested
1107 * a status request message.
1109 if ((s->tlsext_status_type == -1) || (size > 0))
1111 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1114 /* Set flag to expect CertificateStatus message */
1115 s->tlsext_status_expected = 1;
1117 else if (type == TLSEXT_TYPE_renegotiate)
1119 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1121 renegotiate_seen = 1;
1128 *al = SSL_AD_DECODE_ERROR;
1132 if (!renegotiate_seen
1133 && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1135 *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
1136 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1140 if (!s->hit && tlsext_servername == 1)
1142 if (s->tlsext_hostname)
1144 if (s->session->tlsext_hostname == NULL)
1146 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1147 if (!s->session->tlsext_hostname)
1149 *al = SSL_AD_UNRECOGNIZED_NAME;
1155 *al = SSL_AD_DECODE_ERROR;
1166 int ssl_prepare_clienthello_tlsext(SSL *s)
1168 #ifndef OPENSSL_NO_EC
1169 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1170 * and elliptic curves we support.
1175 unsigned long alg_k, alg_a;
1176 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1178 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1180 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1182 alg_k = c->algorithm_mkey;
1183 alg_a = c->algorithm_auth;
1184 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1190 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1193 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1194 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1196 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1199 s->tlsext_ecpointformatlist_length = 3;
1200 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1201 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1202 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1204 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1205 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1206 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1207 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1209 s->tlsext_ellipticcurvelist_length = 0;
1210 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1213 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1214 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1217 #endif /* OPENSSL_NO_EC */
1219 #ifdef TLSEXT_TYPE_opaque_prf_input
1223 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1225 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1230 if (s->tlsext_opaque_prf_input != NULL)
1232 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1233 OPENSSL_free(s->s3->client_opaque_prf_input);
1235 if (s->tlsext_opaque_prf_input_len == 0)
1236 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1238 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1239 if (s->s3->client_opaque_prf_input == NULL)
1241 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1244 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1248 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1249 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1256 int ssl_prepare_serverhello_tlsext(SSL *s)
1258 #ifndef OPENSSL_NO_EC
1259 /* If we are server and using an ECC cipher suite, send the point formats we support
1260 * if the client sent us an ECPointsFormat extension. Note that the server is not
1261 * supposed to send an EllipticCurves extension.
1264 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1265 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1266 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1267 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1271 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1272 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1274 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1277 s->tlsext_ecpointformatlist_length = 3;
1278 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1279 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1280 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1282 #endif /* OPENSSL_NO_EC */
1287 int ssl_check_clienthello_tlsext(SSL *s)
1289 int ret=SSL_TLSEXT_ERR_NOACK;
1290 int al = SSL_AD_UNRECOGNIZED_NAME;
1292 #ifndef OPENSSL_NO_EC
1293 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1294 * ssl3_choose_cipher in s3_lib.c.
1296 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1297 * ssl3_choose_cipher in s3_lib.c.
1301 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1302 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1303 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1304 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1306 /* If status request then ask callback what to do.
1307 * Note: this must be called after servername callbacks in case
1308 * the certificate has changed.
1310 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1313 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1316 /* We don't want to send a status request response */
1317 case SSL_TLSEXT_ERR_NOACK:
1318 s->tlsext_status_expected = 0;
1320 /* status request response should be sent */
1321 case SSL_TLSEXT_ERR_OK:
1322 if (s->tlsext_ocsp_resp)
1323 s->tlsext_status_expected = 1;
1325 s->tlsext_status_expected = 0;
1327 /* something bad happened */
1328 case SSL_TLSEXT_ERR_ALERT_FATAL:
1329 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1330 al = SSL_AD_INTERNAL_ERROR;
1335 s->tlsext_status_expected = 0;
1337 #ifdef TLSEXT_TYPE_opaque_prf_input
1339 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1340 * but we might be sending an alert in response to the client hello,
1341 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1345 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1347 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1350 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1351 al = SSL_AD_INTERNAL_ERROR;
1356 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1357 OPENSSL_free(s->s3->server_opaque_prf_input);
1358 s->s3->server_opaque_prf_input = NULL;
1360 if (s->tlsext_opaque_prf_input != NULL)
1362 if (s->s3->client_opaque_prf_input != NULL &&
1363 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1365 /* can only use this extension if we have a server opaque PRF input
1366 * of the same length as the client opaque PRF input! */
1368 if (s->tlsext_opaque_prf_input_len == 0)
1369 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1371 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1372 if (s->s3->server_opaque_prf_input == NULL)
1374 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1375 al = SSL_AD_INTERNAL_ERROR;
1378 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1382 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1384 /* The callback wants to enforce use of the extension,
1385 * but we can't do that with the client opaque PRF input;
1386 * abort the handshake.
1388 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1389 al = SSL_AD_HANDSHAKE_FAILURE;
1397 case SSL_TLSEXT_ERR_ALERT_FATAL:
1398 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1401 case SSL_TLSEXT_ERR_ALERT_WARNING:
1402 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1405 case SSL_TLSEXT_ERR_NOACK:
1406 s->servername_done=0;
1412 int ssl_check_serverhello_tlsext(SSL *s)
1414 int ret=SSL_TLSEXT_ERR_NOACK;
1415 int al = SSL_AD_UNRECOGNIZED_NAME;
1417 #ifndef OPENSSL_NO_EC
1418 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1419 * must return a an EC point formats lists containing uncompressed.
1421 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1422 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1423 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1424 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1426 /* we are using an ECC cipher */
1428 unsigned char *list;
1429 int found_uncompressed = 0;
1430 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1432 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1435 list = s->session->tlsext_ecpointformatlist;
1436 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1438 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1440 found_uncompressed = 1;
1444 if (!found_uncompressed)
1446 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1450 ret = SSL_TLSEXT_ERR_OK;
1451 #endif /* OPENSSL_NO_EC */
1453 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1454 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1455 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1456 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1458 #ifdef TLSEXT_TYPE_opaque_prf_input
1459 if (s->s3->server_opaque_prf_input_len > 0)
1461 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1462 * So first verify that we really have a value from the server too. */
1464 if (s->s3->server_opaque_prf_input == NULL)
1466 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1467 al = SSL_AD_HANDSHAKE_FAILURE;
1470 /* Anytime the server *has* sent an opaque PRF input, we need to check
1471 * that we have a client opaque PRF input of the same size. */
1472 if (s->s3->client_opaque_prf_input == NULL ||
1473 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1475 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1476 al = SSL_AD_ILLEGAL_PARAMETER;
1481 /* If we've requested certificate status and we wont get one
1484 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1485 && s->ctx && s->ctx->tlsext_status_cb)
1488 /* Set resp to NULL, resplen to -1 so callback knows
1489 * there is no response.
1491 if (s->tlsext_ocsp_resp)
1493 OPENSSL_free(s->tlsext_ocsp_resp);
1494 s->tlsext_ocsp_resp = NULL;
1496 s->tlsext_ocsp_resplen = -1;
1497 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1500 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1501 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1505 al = SSL_AD_INTERNAL_ERROR;
1506 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1512 case SSL_TLSEXT_ERR_ALERT_FATAL:
1513 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1516 case SSL_TLSEXT_ERR_ALERT_WARNING:
1517 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1520 case SSL_TLSEXT_ERR_NOACK:
1521 s->servername_done=0;
1527 /* Since the server cache lookup is done early on in the processing of client
1528 * hello and other operations depend on the result we need to handle any TLS
1529 * session ticket extension at the same time.
1532 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1533 const unsigned char *limit, SSL_SESSION **ret)
1535 /* Point after session ID in client hello */
1536 const unsigned char *p = session_id + len;
1539 /* If tickets disabled behave as if no ticket present
1540 * to permit stateful resumption.
1542 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1545 if ((s->version <= SSL3_VERSION) || !limit)
1549 /* Skip past DTLS cookie */
1550 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1557 /* Skip past cipher list */
1562 /* Skip past compression algorithm list */
1567 /* Now at start of extensions */
1568 if ((p + 2) >= limit)
1571 while ((p + 4) <= limit)
1573 unsigned short type, size;
1576 if (p + size > limit)
1578 if (type == TLSEXT_TYPE_session_ticket)
1580 /* If tickets disabled indicate cache miss which will
1581 * trigger a full handshake
1583 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1585 /* If zero length note client will accept a ticket
1586 * and indicate cache miss to trigger full handshake
1590 s->tlsext_ticket_expected = 1;
1591 return 0; /* Cache miss */
1593 if (s->tls_session_secret_cb)
1595 /* Indicate cache miss here and instead of
1596 * generating the session from ticket now,
1597 * trigger abbreviated handshake based on
1598 * external mechanism to calculate the master
1602 return tls_decrypt_ticket(s, p, size, session_id, len,
1610 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1611 const unsigned char *sess_id, int sesslen,
1612 SSL_SESSION **psess)
1615 unsigned char *sdec;
1616 const unsigned char *p;
1617 int slen, mlen, renew_ticket = 0;
1618 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1621 SSL_CTX *tctx = s->initial_ctx;
1622 /* Need at least keyname + iv + some encrypted data */
1625 /* Initialize session ticket encryption and HMAC contexts */
1626 HMAC_CTX_init(&hctx);
1627 EVP_CIPHER_CTX_init(&ctx);
1628 if (tctx->tlsext_ticket_key_cb)
1630 unsigned char *nctick = (unsigned char *)etick;
1631 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1642 /* Check key name matches */
1643 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1645 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1646 tlsext_tick_md(), NULL);
1647 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1648 tctx->tlsext_tick_aes_key, etick + 16);
1650 /* Attempt to process session ticket, first conduct sanity and
1651 * integrity checks on ticket.
1653 mlen = HMAC_size(&hctx);
1656 EVP_CIPHER_CTX_cleanup(&ctx);
1660 /* Check HMAC of encrypted ticket */
1661 HMAC_Update(&hctx, etick, eticklen);
1662 HMAC_Final(&hctx, tick_hmac, NULL);
1663 HMAC_CTX_cleanup(&hctx);
1664 if (memcmp(tick_hmac, etick + eticklen, mlen))
1666 /* Attempt to decrypt session data */
1667 /* Move p after IV to start of encrypted ticket, update length */
1668 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1669 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1670 sdec = OPENSSL_malloc(eticklen);
1673 EVP_CIPHER_CTX_cleanup(&ctx);
1676 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1677 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1680 EVP_CIPHER_CTX_cleanup(&ctx);
1683 sess = d2i_SSL_SESSION(NULL, &p, slen);
1687 /* The session ID if non-empty is used by some clients to
1688 * detect that the ticket has been accepted. So we copy it to
1689 * the session structure. If it is empty set length to zero
1690 * as required by standard.
1693 memcpy(sess->session_id, sess_id, sesslen);
1694 sess->session_id_length = sesslen;
1696 s->tlsext_ticket_expected = renew_ticket;
1699 /* If session decrypt failure indicate a cache miss and set state to
1703 s->tlsext_ticket_expected = 1;