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 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 the renegotiation option: TODOEKR switch */
323 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
325 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
329 if((limit - p - 4 - el) < 0) return NULL;
331 s2n(TLSEXT_TYPE_renegotiate,ret);
334 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
336 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
343 #ifndef OPENSSL_NO_EC
344 if (s->tlsext_ecpointformatlist != NULL &&
345 s->version != DTLS1_VERSION)
347 /* Add TLS extension ECPointFormats to the ClientHello message */
350 if ((lenmax = limit - ret - 5) < 0) return NULL;
351 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
352 if (s->tlsext_ecpointformatlist_length > 255)
354 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
358 s2n(TLSEXT_TYPE_ec_point_formats,ret);
359 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
360 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
361 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
362 ret+=s->tlsext_ecpointformatlist_length;
364 if (s->tlsext_ellipticcurvelist != NULL &&
365 s->version != DTLS1_VERSION)
367 /* Add TLS extension EllipticCurves to the ClientHello message */
370 if ((lenmax = limit - ret - 6) < 0) return NULL;
371 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
372 if (s->tlsext_ellipticcurvelist_length > 65532)
374 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
378 s2n(TLSEXT_TYPE_elliptic_curves,ret);
379 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
381 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
382 * elliptic_curve_list, but the examples use two bytes.
383 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
384 * resolves this to two bytes.
386 s2n(s->tlsext_ellipticcurvelist_length, ret);
387 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
388 ret+=s->tlsext_ellipticcurvelist_length;
390 #endif /* OPENSSL_NO_EC */
392 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
395 if (!s->new_session && s->session && s->session->tlsext_tick)
396 ticklen = s->session->tlsext_ticklen;
397 else if (s->session && s->tlsext_session_ticket &&
398 s->tlsext_session_ticket->data)
400 ticklen = s->tlsext_session_ticket->length;
401 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
402 if (!s->session->tlsext_tick)
404 memcpy(s->session->tlsext_tick,
405 s->tlsext_session_ticket->data,
407 s->session->tlsext_ticklen = ticklen;
411 if (ticklen == 0 && s->tlsext_session_ticket &&
412 s->tlsext_session_ticket->data == NULL)
414 /* Check for enough room 2 for extension type, 2 for len
417 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
418 s2n(TLSEXT_TYPE_session_ticket,ret);
422 memcpy(ret, s->session->tlsext_tick, ticklen);
428 #ifdef TLSEXT_TYPE_opaque_prf_input
429 if (s->s3->client_opaque_prf_input != NULL &&
430 s->version != DTLS1_VERSION)
432 size_t col = s->s3->client_opaque_prf_input_len;
434 if ((long)(limit - ret - 6 - col < 0))
436 if (col > 0xFFFD) /* can't happen */
439 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
442 memcpy(ret, s->s3->client_opaque_prf_input, col);
447 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
448 s->version != DTLS1_VERSION)
451 long extlen, idlen, itmp;
455 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
457 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
458 itmp = i2d_OCSP_RESPID(id, NULL);
464 if (s->tlsext_ocsp_exts)
466 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
473 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
474 s2n(TLSEXT_TYPE_status_request, ret);
475 if (extlen + idlen > 0xFFF0)
477 s2n(extlen + idlen + 5, ret);
478 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
480 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
482 /* save position of id len */
483 unsigned char *q = ret;
484 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
485 /* skip over id len */
487 itmp = i2d_OCSP_RESPID(id, &ret);
493 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
496 if ((extdatalen = ret-p-2)== 0)
503 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
506 unsigned char *ret = p;
508 /* don't add extensions for SSLv3, unless doing secure renegotiation */
509 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
513 if (ret>=limit) return NULL; /* this really never occurs, but ... */
515 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
517 if ((long)(limit - ret - 4) < 0) return NULL;
519 s2n(TLSEXT_TYPE_server_name,ret);
523 if(s->s3->send_connection_binding)
527 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
529 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
533 if((limit - p - 4 - el) < 0) return NULL;
535 s2n(TLSEXT_TYPE_renegotiate,ret);
538 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
540 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
547 #ifndef OPENSSL_NO_EC
548 if (s->tlsext_ecpointformatlist != NULL &&
549 s->version != DTLS1_VERSION)
551 /* Add TLS extension ECPointFormats to the ServerHello message */
554 if ((lenmax = limit - ret - 5) < 0) return NULL;
555 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
556 if (s->tlsext_ecpointformatlist_length > 255)
558 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
562 s2n(TLSEXT_TYPE_ec_point_formats,ret);
563 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
564 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
565 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
566 ret+=s->tlsext_ecpointformatlist_length;
569 /* Currently the server should not respond with a SupportedCurves extension */
570 #endif /* OPENSSL_NO_EC */
572 if (s->tlsext_ticket_expected
573 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
575 if ((long)(limit - ret - 4) < 0) return NULL;
576 s2n(TLSEXT_TYPE_session_ticket,ret);
580 if (s->tlsext_status_expected)
582 if ((long)(limit - ret - 4) < 0) return NULL;
583 s2n(TLSEXT_TYPE_status_request,ret);
587 #ifdef TLSEXT_TYPE_opaque_prf_input
588 if (s->s3->server_opaque_prf_input != NULL &&
589 s->version != DTLS1_VERSION)
591 size_t sol = s->s3->server_opaque_prf_input_len;
593 if ((long)(limit - ret - 6 - sol) < 0)
595 if (sol > 0xFFFD) /* can't happen */
598 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
601 memcpy(ret, s->s3->server_opaque_prf_input, sol);
605 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
606 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
607 { const unsigned char cryptopro_ext[36] = {
608 0xfd, 0xe8, /*65000*/
609 0x00, 0x20, /*32 bytes length*/
610 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
611 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
612 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
613 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
614 if (limit-ret<36) return NULL;
615 memcpy(ret,cryptopro_ext,36);
620 if ((extdatalen = ret-p-2)== 0)
627 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
632 unsigned char *data = *p;
633 int renegotiate_seen = 0;
635 s->servername_done = 0;
636 s->tlsext_status_type = -1;
642 if (data > (d+n-len))
645 while (data <= (d+n-4))
650 if (data+size > (d+n))
653 fprintf(stderr,"Received extension type %d size %d\n",type,size);
655 if (s->tlsext_debug_cb)
656 s->tlsext_debug_cb(s, 0, type, data, size,
657 s->tlsext_debug_arg);
658 /* The servername extension is treated as follows:
660 - Only the hostname type is supported with a maximum length of 255.
661 - The servername is rejected if too long or if it contains zeros,
662 in which case an fatal alert is generated.
663 - The servername field is maintained together with the session cache.
664 - When a session is resumed, the servername call back invoked in order
665 to allow the application to position itself to the right context.
666 - The servername is acknowledged if it is new for a session or when
667 it is identical to a previously used for the same session.
668 Applications can control the behaviour. They can at any time
669 set a 'desirable' servername for a new SSL object. This can be the
670 case for example with HTTPS when a Host: header field is received and
671 a renegotiation is requested. In this case, a possible servername
672 presented in the new client hello is only acknowledged if it matches
673 the value of the Host: field.
674 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
675 if they provide for changing an explicit servername context for the session,
676 i.e. when the session has been established with a servername extension.
677 - On session reconnect, the servername extension may be absent.
681 if (type == TLSEXT_TYPE_server_name)
683 unsigned char *sdata;
689 *al = SSL_AD_DECODE_ERROR;
696 *al = SSL_AD_DECODE_ERROR;
703 servname_type = *(sdata++);
709 *al = SSL_AD_DECODE_ERROR;
712 if (s->servername_done == 0)
713 switch (servname_type)
715 case TLSEXT_NAMETYPE_host_name:
716 if (s->session->tlsext_hostname == NULL)
718 if (len > TLSEXT_MAXLEN_host_name ||
719 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
721 *al = TLS1_AD_UNRECOGNIZED_NAME;
724 memcpy(s->session->tlsext_hostname, sdata, len);
725 s->session->tlsext_hostname[len]='\0';
726 if (strlen(s->session->tlsext_hostname) != len) {
727 OPENSSL_free(s->session->tlsext_hostname);
728 s->session->tlsext_hostname = NULL;
729 *al = TLS1_AD_UNRECOGNIZED_NAME;
732 s->servername_done = 1;
736 s->servername_done = strlen(s->session->tlsext_hostname) == len
737 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
749 *al = SSL_AD_DECODE_ERROR;
755 #ifndef OPENSSL_NO_EC
756 else if (type == TLSEXT_TYPE_ec_point_formats &&
757 s->version != DTLS1_VERSION)
759 unsigned char *sdata = data;
760 int ecpointformatlist_length = *(sdata++);
762 if (ecpointformatlist_length != size - 1)
764 *al = TLS1_AD_DECODE_ERROR;
767 s->session->tlsext_ecpointformatlist_length = 0;
768 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
769 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
771 *al = TLS1_AD_INTERNAL_ERROR;
774 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
775 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
777 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
778 sdata = s->session->tlsext_ecpointformatlist;
779 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
780 fprintf(stderr,"%i ",*(sdata++));
781 fprintf(stderr,"\n");
784 else if (type == TLSEXT_TYPE_elliptic_curves &&
785 s->version != DTLS1_VERSION)
787 unsigned char *sdata = data;
788 int ellipticcurvelist_length = (*(sdata++) << 8);
789 ellipticcurvelist_length += (*(sdata++));
791 if (ellipticcurvelist_length != size - 2)
793 *al = TLS1_AD_DECODE_ERROR;
796 s->session->tlsext_ellipticcurvelist_length = 0;
797 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
798 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
800 *al = TLS1_AD_INTERNAL_ERROR;
803 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
804 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
806 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
807 sdata = s->session->tlsext_ellipticcurvelist;
808 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
809 fprintf(stderr,"%i ",*(sdata++));
810 fprintf(stderr,"\n");
813 #endif /* OPENSSL_NO_EC */
814 #ifdef TLSEXT_TYPE_opaque_prf_input
815 else if (type == TLSEXT_TYPE_opaque_prf_input &&
816 s->version != DTLS1_VERSION)
818 unsigned char *sdata = data;
822 *al = SSL_AD_DECODE_ERROR;
825 n2s(sdata, s->s3->client_opaque_prf_input_len);
826 if (s->s3->client_opaque_prf_input_len != size - 2)
828 *al = SSL_AD_DECODE_ERROR;
832 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
833 OPENSSL_free(s->s3->client_opaque_prf_input);
834 if (s->s3->client_opaque_prf_input_len == 0)
835 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
837 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
838 if (s->s3->client_opaque_prf_input == NULL)
840 *al = TLS1_AD_INTERNAL_ERROR;
845 else if (type == TLSEXT_TYPE_session_ticket)
847 if (s->tls_session_ticket_ext_cb &&
848 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
850 *al = TLS1_AD_INTERNAL_ERROR;
854 else if (type == TLSEXT_TYPE_renegotiate)
856 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
858 renegotiate_seen = 1;
860 else if (type == TLSEXT_TYPE_status_request &&
861 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
866 *al = SSL_AD_DECODE_ERROR;
870 s->tlsext_status_type = *data++;
872 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
874 const unsigned char *sdata;
876 /* Read in responder_id_list */
881 *al = SSL_AD_DECODE_ERROR;
890 *al = SSL_AD_DECODE_ERROR;
897 *al = SSL_AD_DECODE_ERROR;
902 id = d2i_OCSP_RESPID(NULL,
906 *al = SSL_AD_DECODE_ERROR;
911 OCSP_RESPID_free(id);
912 *al = SSL_AD_DECODE_ERROR;
915 if (!s->tlsext_ocsp_ids
916 && !(s->tlsext_ocsp_ids =
917 sk_OCSP_RESPID_new_null()))
919 OCSP_RESPID_free(id);
920 *al = SSL_AD_INTERNAL_ERROR;
923 if (!sk_OCSP_RESPID_push(
924 s->tlsext_ocsp_ids, id))
926 OCSP_RESPID_free(id);
927 *al = SSL_AD_INTERNAL_ERROR;
932 /* Read in request_extensions */
937 *al = SSL_AD_DECODE_ERROR;
943 s->tlsext_ocsp_exts =
944 d2i_X509_EXTENSIONS(NULL,
946 if (!s->tlsext_ocsp_exts
947 || (data + dsize != sdata))
949 *al = SSL_AD_DECODE_ERROR;
954 /* We don't know what to do with any other type
958 s->tlsext_status_type = -1;
961 /* session ticket processed earlier */
969 /* Need RI if renegotiating */
971 if (!renegotiate_seen && s->new_session &&
972 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
974 /* FIXME: Spec currently doesn't give alert to use */
975 *al = SSL_AD_ILLEGAL_PARAMETER;
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)
989 unsigned char *data = *p;
990 int tlsext_servername = 0;
991 int renegotiate_seen = 0;
998 while(data <= (d+n-4))
1003 if (data+size > (d+n))
1006 if (s->tlsext_debug_cb)
1007 s->tlsext_debug_cb(s, 1, type, data, size,
1008 s->tlsext_debug_arg);
1010 if (type == TLSEXT_TYPE_server_name)
1012 if (s->tlsext_hostname == NULL || size > 0)
1014 *al = TLS1_AD_UNRECOGNIZED_NAME;
1017 tlsext_servername = 1;
1020 #ifndef OPENSSL_NO_EC
1021 else if (type == TLSEXT_TYPE_ec_point_formats &&
1022 s->version != DTLS1_VERSION)
1024 unsigned char *sdata = data;
1025 int ecpointformatlist_length = *(sdata++);
1027 if (ecpointformatlist_length != size - 1)
1029 *al = TLS1_AD_DECODE_ERROR;
1032 s->session->tlsext_ecpointformatlist_length = 0;
1033 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1034 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1036 *al = TLS1_AD_INTERNAL_ERROR;
1039 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1040 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1042 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1043 sdata = s->session->tlsext_ecpointformatlist;
1044 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1045 fprintf(stderr,"%i ",*(sdata++));
1046 fprintf(stderr,"\n");
1049 #endif /* OPENSSL_NO_EC */
1051 else if (type == TLSEXT_TYPE_session_ticket)
1053 if (s->tls_session_ticket_ext_cb &&
1054 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1056 *al = TLS1_AD_INTERNAL_ERROR;
1059 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1062 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1065 s->tlsext_ticket_expected = 1;
1067 #ifdef TLSEXT_TYPE_opaque_prf_input
1068 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1069 s->version != DTLS1_VERSION)
1071 unsigned char *sdata = data;
1075 *al = SSL_AD_DECODE_ERROR;
1078 n2s(sdata, s->s3->server_opaque_prf_input_len);
1079 if (s->s3->server_opaque_prf_input_len != size - 2)
1081 *al = SSL_AD_DECODE_ERROR;
1085 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1086 OPENSSL_free(s->s3->server_opaque_prf_input);
1087 if (s->s3->server_opaque_prf_input_len == 0)
1088 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1090 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1092 if (s->s3->server_opaque_prf_input == NULL)
1094 *al = TLS1_AD_INTERNAL_ERROR;
1099 else if (type == TLSEXT_TYPE_status_request &&
1100 s->version != DTLS1_VERSION)
1102 /* MUST be empty and only sent if we've requested
1103 * a status request message.
1105 if ((s->tlsext_status_type == -1) || (size > 0))
1107 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1110 /* Set flag to expect CertificateStatus message */
1111 s->tlsext_status_expected = 1;
1113 else if (type == TLSEXT_TYPE_renegotiate)
1115 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1117 renegotiate_seen = 1;
1124 *al = SSL_AD_DECODE_ERROR;
1128 if (!s->hit && tlsext_servername == 1)
1130 if (s->tlsext_hostname)
1132 if (s->session->tlsext_hostname == NULL)
1134 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1135 if (!s->session->tlsext_hostname)
1137 *al = SSL_AD_UNRECOGNIZED_NAME;
1143 *al = SSL_AD_DECODE_ERROR;
1153 /* Determine if we need to see RI. Strictly speaking if we want to
1154 * avoid an attack we should *always* see RI even on initial server
1155 * hello because the client doesn't see any renegotiation during an
1156 * attack. However this would mean we could not connect to any server
1157 * which doesn't support RI so for the immediate future tolerate RI
1158 * absence on initial connect only.
1160 if (!renegotiate_seen && s->new_session &&
1161 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1163 /* FIXME: Spec currently doesn't give alert to use */
1164 *al = SSL_AD_ILLEGAL_PARAMETER;
1165 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1166 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1174 int ssl_prepare_clienthello_tlsext(SSL *s)
1176 #ifndef OPENSSL_NO_EC
1177 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1178 * and elliptic curves we support.
1183 unsigned long alg_k, alg_a;
1184 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1186 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1188 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1190 alg_k = c->algorithm_mkey;
1191 alg_a = c->algorithm_auth;
1192 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1198 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1201 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1202 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1204 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1207 s->tlsext_ecpointformatlist_length = 3;
1208 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1209 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1210 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1212 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1213 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1214 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1215 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1217 s->tlsext_ellipticcurvelist_length = 0;
1218 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1221 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1222 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1225 #endif /* OPENSSL_NO_EC */
1227 #ifdef TLSEXT_TYPE_opaque_prf_input
1231 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1233 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1238 if (s->tlsext_opaque_prf_input != NULL)
1240 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1241 OPENSSL_free(s->s3->client_opaque_prf_input);
1243 if (s->tlsext_opaque_prf_input_len == 0)
1244 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1246 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1247 if (s->s3->client_opaque_prf_input == NULL)
1249 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1252 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1256 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1257 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1264 int ssl_prepare_serverhello_tlsext(SSL *s)
1266 #ifndef OPENSSL_NO_EC
1267 /* If we are server and using an ECC cipher suite, send the point formats we support
1268 * if the client sent us an ECPointsFormat extension. Note that the server is not
1269 * supposed to send an EllipticCurves extension.
1272 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1273 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1274 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1275 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1279 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1280 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1282 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1285 s->tlsext_ecpointformatlist_length = 3;
1286 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1287 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1288 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1290 #endif /* OPENSSL_NO_EC */
1295 int ssl_check_clienthello_tlsext(SSL *s)
1297 int ret=SSL_TLSEXT_ERR_NOACK;
1298 int al = SSL_AD_UNRECOGNIZED_NAME;
1300 #ifndef OPENSSL_NO_EC
1301 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1302 * ssl3_choose_cipher in s3_lib.c.
1304 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1305 * ssl3_choose_cipher in s3_lib.c.
1309 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1310 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1311 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1312 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1314 /* If status request then ask callback what to do.
1315 * Note: this must be called after servername callbacks in case
1316 * the certificate has changed.
1318 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1321 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1324 /* We don't want to send a status request response */
1325 case SSL_TLSEXT_ERR_NOACK:
1326 s->tlsext_status_expected = 0;
1328 /* status request response should be sent */
1329 case SSL_TLSEXT_ERR_OK:
1330 if (s->tlsext_ocsp_resp)
1331 s->tlsext_status_expected = 1;
1333 s->tlsext_status_expected = 0;
1335 /* something bad happened */
1336 case SSL_TLSEXT_ERR_ALERT_FATAL:
1337 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1338 al = SSL_AD_INTERNAL_ERROR;
1343 s->tlsext_status_expected = 0;
1345 #ifdef TLSEXT_TYPE_opaque_prf_input
1347 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1348 * but we might be sending an alert in response to the client hello,
1349 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1353 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1355 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1358 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1359 al = SSL_AD_INTERNAL_ERROR;
1364 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1365 OPENSSL_free(s->s3->server_opaque_prf_input);
1366 s->s3->server_opaque_prf_input = NULL;
1368 if (s->tlsext_opaque_prf_input != NULL)
1370 if (s->s3->client_opaque_prf_input != NULL &&
1371 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1373 /* can only use this extension if we have a server opaque PRF input
1374 * of the same length as the client opaque PRF input! */
1376 if (s->tlsext_opaque_prf_input_len == 0)
1377 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1379 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1380 if (s->s3->server_opaque_prf_input == NULL)
1382 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1383 al = SSL_AD_INTERNAL_ERROR;
1386 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1390 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1392 /* The callback wants to enforce use of the extension,
1393 * but we can't do that with the client opaque PRF input;
1394 * abort the handshake.
1396 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1397 al = SSL_AD_HANDSHAKE_FAILURE;
1405 case SSL_TLSEXT_ERR_ALERT_FATAL:
1406 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1409 case SSL_TLSEXT_ERR_ALERT_WARNING:
1410 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1413 case SSL_TLSEXT_ERR_NOACK:
1414 s->servername_done=0;
1420 int ssl_check_serverhello_tlsext(SSL *s)
1422 int ret=SSL_TLSEXT_ERR_NOACK;
1423 int al = SSL_AD_UNRECOGNIZED_NAME;
1425 #ifndef OPENSSL_NO_EC
1426 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1427 * must return a an EC point formats lists containing uncompressed.
1429 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1430 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1431 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1432 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1434 /* we are using an ECC cipher */
1436 unsigned char *list;
1437 int found_uncompressed = 0;
1438 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1440 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1443 list = s->session->tlsext_ecpointformatlist;
1444 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1446 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1448 found_uncompressed = 1;
1452 if (!found_uncompressed)
1454 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1458 ret = SSL_TLSEXT_ERR_OK;
1459 #endif /* OPENSSL_NO_EC */
1461 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1462 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1463 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1464 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1466 #ifdef TLSEXT_TYPE_opaque_prf_input
1467 if (s->s3->server_opaque_prf_input_len > 0)
1469 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1470 * So first verify that we really have a value from the server too. */
1472 if (s->s3->server_opaque_prf_input == NULL)
1474 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1475 al = SSL_AD_HANDSHAKE_FAILURE;
1478 /* Anytime the server *has* sent an opaque PRF input, we need to check
1479 * that we have a client opaque PRF input of the same size. */
1480 if (s->s3->client_opaque_prf_input == NULL ||
1481 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1483 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1484 al = SSL_AD_ILLEGAL_PARAMETER;
1489 /* If we've requested certificate status and we wont get one
1492 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1493 && s->ctx && s->ctx->tlsext_status_cb)
1496 /* Set resp to NULL, resplen to -1 so callback knows
1497 * there is no response.
1499 if (s->tlsext_ocsp_resp)
1501 OPENSSL_free(s->tlsext_ocsp_resp);
1502 s->tlsext_ocsp_resp = NULL;
1504 s->tlsext_ocsp_resplen = -1;
1505 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1508 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1509 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1513 al = SSL_AD_INTERNAL_ERROR;
1514 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1520 case SSL_TLSEXT_ERR_ALERT_FATAL:
1521 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1524 case SSL_TLSEXT_ERR_ALERT_WARNING:
1525 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1528 case SSL_TLSEXT_ERR_NOACK:
1529 s->servername_done=0;
1535 /* Since the server cache lookup is done early on in the processing of client
1536 * hello and other operations depend on the result we need to handle any TLS
1537 * session ticket extension at the same time.
1540 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1541 const unsigned char *limit, SSL_SESSION **ret)
1543 /* Point after session ID in client hello */
1544 const unsigned char *p = session_id + len;
1547 /* If tickets disabled behave as if no ticket present
1548 * to permit stateful resumption.
1550 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1553 if ((s->version <= SSL3_VERSION) || !limit)
1557 /* Skip past DTLS cookie */
1558 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1565 /* Skip past cipher list */
1570 /* Skip past compression algorithm list */
1575 /* Now at start of extensions */
1576 if ((p + 2) >= limit)
1579 while ((p + 4) <= limit)
1581 unsigned short type, size;
1584 if (p + size > limit)
1586 if (type == TLSEXT_TYPE_session_ticket)
1588 /* If tickets disabled indicate cache miss which will
1589 * trigger a full handshake
1591 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1593 /* If zero length note client will accept a ticket
1594 * and indicate cache miss to trigger full handshake
1598 s->tlsext_ticket_expected = 1;
1599 return 0; /* Cache miss */
1601 if (s->tls_session_secret_cb)
1603 /* Indicate cache miss here and instead of
1604 * generating the session from ticket now,
1605 * trigger abbreviated handshake based on
1606 * external mechanism to calculate the master
1610 return tls_decrypt_ticket(s, p, size, session_id, len,
1618 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1619 const unsigned char *sess_id, int sesslen,
1620 SSL_SESSION **psess)
1623 unsigned char *sdec;
1624 const unsigned char *p;
1625 int slen, mlen, renew_ticket = 0;
1626 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1629 SSL_CTX *tctx = s->initial_ctx;
1630 /* Need at least keyname + iv + some encrypted data */
1633 /* Initialize session ticket encryption and HMAC contexts */
1634 HMAC_CTX_init(&hctx);
1635 EVP_CIPHER_CTX_init(&ctx);
1636 if (tctx->tlsext_ticket_key_cb)
1638 unsigned char *nctick = (unsigned char *)etick;
1639 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1650 /* Check key name matches */
1651 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1653 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1654 tlsext_tick_md(), NULL);
1655 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1656 tctx->tlsext_tick_aes_key, etick + 16);
1658 /* Attempt to process session ticket, first conduct sanity and
1659 * integrity checks on ticket.
1661 mlen = HMAC_size(&hctx);
1664 EVP_CIPHER_CTX_cleanup(&ctx);
1668 /* Check HMAC of encrypted ticket */
1669 HMAC_Update(&hctx, etick, eticklen);
1670 HMAC_Final(&hctx, tick_hmac, NULL);
1671 HMAC_CTX_cleanup(&hctx);
1672 if (memcmp(tick_hmac, etick + eticklen, mlen))
1674 /* Attempt to decrypt session data */
1675 /* Move p after IV to start of encrypted ticket, update length */
1676 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1677 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1678 sdec = OPENSSL_malloc(eticklen);
1681 EVP_CIPHER_CTX_cleanup(&ctx);
1684 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1685 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1688 EVP_CIPHER_CTX_cleanup(&ctx);
1691 sess = d2i_SSL_SESSION(NULL, &p, slen);
1695 /* The session ID if non-empty is used by some clients to
1696 * detect that the ticket has been accepted. So we copy it to
1697 * the session structure. If it is empty set length to zero
1698 * as required by standard.
1701 memcpy(sess->session_id, sess_id, sesslen);
1702 sess->session_id_length = sesslen;
1704 s->tlsext_ticket_expected = renew_ticket;
1707 /* If session decrypt failure indicate a cache miss and set state to
1711 s->tlsext_ticket_expected = 1;