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 <openssl/rand.h>
118 #include "ssl_locl.h"
120 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
122 #ifndef OPENSSL_NO_TLSEXT
123 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
124 const unsigned char *sess_id, int sesslen,
125 SSL_SESSION **psess);
126 static int ssl_check_clienthello_tlsext(SSL *s);
127 int ssl_check_serverhello_tlsext(SSL *s);
130 SSL3_ENC_METHOD TLSv1_enc_data={
133 tls1_setup_key_block,
134 tls1_generate_master_secret,
135 tls1_change_cipher_state,
136 tls1_final_finish_mac,
137 TLS1_FINISH_MAC_LENGTH,
138 tls1_cert_verify_mac,
139 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
140 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
142 tls1_export_keying_material,
145 long tls1_default_timeout(void)
147 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
148 * is way too long for http, the cache would over fill */
154 if (!ssl3_new(s)) return(0);
155 s->method->ssl_clear(s);
159 void tls1_free(SSL *s)
161 #ifndef OPENSSL_NO_TLSEXT
162 if (s->tlsext_session_ticket)
164 OPENSSL_free(s->tlsext_session_ticket);
166 #endif /* OPENSSL_NO_TLSEXT */
170 void tls1_clear(SSL *s)
173 s->version = s->method->version;
176 #ifndef OPENSSL_NO_EC
178 static int nid_list[] =
180 NID_sect163k1, /* sect163k1 (1) */
181 NID_sect163r1, /* sect163r1 (2) */
182 NID_sect163r2, /* sect163r2 (3) */
183 NID_sect193r1, /* sect193r1 (4) */
184 NID_sect193r2, /* sect193r2 (5) */
185 NID_sect233k1, /* sect233k1 (6) */
186 NID_sect233r1, /* sect233r1 (7) */
187 NID_sect239k1, /* sect239k1 (8) */
188 NID_sect283k1, /* sect283k1 (9) */
189 NID_sect283r1, /* sect283r1 (10) */
190 NID_sect409k1, /* sect409k1 (11) */
191 NID_sect409r1, /* sect409r1 (12) */
192 NID_sect571k1, /* sect571k1 (13) */
193 NID_sect571r1, /* sect571r1 (14) */
194 NID_secp160k1, /* secp160k1 (15) */
195 NID_secp160r1, /* secp160r1 (16) */
196 NID_secp160r2, /* secp160r2 (17) */
197 NID_secp192k1, /* secp192k1 (18) */
198 NID_X9_62_prime192v1, /* secp192r1 (19) */
199 NID_secp224k1, /* secp224k1 (20) */
200 NID_secp224r1, /* secp224r1 (21) */
201 NID_secp256k1, /* secp256k1 (22) */
202 NID_X9_62_prime256v1, /* secp256r1 (23) */
203 NID_secp384r1, /* secp384r1 (24) */
204 NID_secp521r1 /* secp521r1 (25) */
208 static const unsigned char ecformats_default[] =
210 TLSEXT_ECPOINTFORMAT_uncompressed,
211 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
212 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
215 static const unsigned char eccurves_default[] =
217 0,14, /* sect571r1 (14) */
218 0,13, /* sect571k1 (13) */
219 0,25, /* secp521r1 (25) */
220 0,11, /* sect409k1 (11) */
221 0,12, /* sect409r1 (12) */
222 0,24, /* secp384r1 (24) */
223 0,9, /* sect283k1 (9) */
224 0,10, /* sect283r1 (10) */
225 0,22, /* secp256k1 (22) */
226 0,23, /* secp256r1 (23) */
227 0,8, /* sect239k1 (8) */
228 0,6, /* sect233k1 (6) */
229 0,7, /* sect233r1 (7) */
230 0,20, /* secp224k1 (20) */
231 0,21, /* secp224r1 (21) */
232 0,4, /* sect193r1 (4) */
233 0,5, /* sect193r2 (5) */
234 0,18, /* secp192k1 (18) */
235 0,19, /* secp192r1 (19) */
236 0,1, /* sect163k1 (1) */
237 0,2, /* sect163r1 (2) */
238 0,3, /* sect163r2 (3) */
239 0,15, /* secp160k1 (15) */
240 0,16, /* secp160r1 (16) */
241 0,17, /* secp160r2 (17) */
244 int tls1_ec_curve_id2nid(int curve_id)
246 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
247 if ((curve_id < 1) || ((unsigned int)curve_id >
248 sizeof(nid_list)/sizeof(nid_list[0])))
250 return nid_list[curve_id-1];
253 int tls1_ec_nid2curve_id(int nid)
255 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
258 case NID_sect163k1: /* sect163k1 (1) */
260 case NID_sect163r1: /* sect163r1 (2) */
262 case NID_sect163r2: /* sect163r2 (3) */
264 case NID_sect193r1: /* sect193r1 (4) */
266 case NID_sect193r2: /* sect193r2 (5) */
268 case NID_sect233k1: /* sect233k1 (6) */
270 case NID_sect233r1: /* sect233r1 (7) */
272 case NID_sect239k1: /* sect239k1 (8) */
274 case NID_sect283k1: /* sect283k1 (9) */
276 case NID_sect283r1: /* sect283r1 (10) */
278 case NID_sect409k1: /* sect409k1 (11) */
280 case NID_sect409r1: /* sect409r1 (12) */
282 case NID_sect571k1: /* sect571k1 (13) */
284 case NID_sect571r1: /* sect571r1 (14) */
286 case NID_secp160k1: /* secp160k1 (15) */
288 case NID_secp160r1: /* secp160r1 (16) */
290 case NID_secp160r2: /* secp160r2 (17) */
292 case NID_secp192k1: /* secp192k1 (18) */
294 case NID_X9_62_prime192v1: /* secp192r1 (19) */
296 case NID_secp224k1: /* secp224k1 (20) */
298 case NID_secp224r1: /* secp224r1 (21) */
300 case NID_secp256k1: /* secp256k1 (22) */
302 case NID_X9_62_prime256v1: /* secp256r1 (23) */
304 case NID_secp384r1: /* secp384r1 (24) */
306 case NID_secp521r1: /* secp521r1 (25) */
312 /* Get curves list, if "sess" is set return client curves otherwise
315 static void tls1_get_curvelist(SSL *s, int sess,
316 const unsigned char **pcurves,
321 *pcurves = s->session->tlsext_ellipticcurvelist;
322 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
326 *pcurves = s->tlsext_ellipticcurvelist;
327 *pcurveslen = s->tlsext_ellipticcurvelist_length;
329 /* If not set use default: for now static structure */
332 *pcurves = eccurves_default;
333 *pcurveslen = sizeof(eccurves_default);
337 /* Return nth shared curve. If nmatch == -1 return number of
341 int tls1_shared_curve(SSL *s, int nmatch)
343 const unsigned char *pref, *supp;
344 size_t preflen, supplen, i, j;
346 /* Can't do anything on client side */
349 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
351 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
356 for (i = 0; i < preflen; i++, pref+=2)
358 const unsigned char *tsupp = supp;
359 for (j = 0; j < supplen; j++, tsupp+=2)
361 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
365 int id = (pref[0] << 8) | pref[1];
366 return tls1_ec_curve_id2nid(id);
377 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
378 int *curves, size_t ncurves)
380 unsigned char *clist, *p;
382 /* Bitmap of curves included to detect duplicates: only works
383 * while curve ids < 32
385 unsigned long dup_list = 0;
386 clist = OPENSSL_malloc(ncurves * 2);
389 for (i = 0, p = clist; i < ncurves; i++)
391 unsigned long idmask;
393 id = tls1_ec_nid2curve_id(curves[i]);
395 if (!id || (dup_list & idmask))
406 *pextlen = ncurves * 2;
410 #define MAX_CURVELIST 25
415 int nid_arr[MAX_CURVELIST];
418 static int nid_cb(const char *elem, int len, void *arg)
420 nid_cb_st *narg = arg;
424 if (narg->nidcnt == MAX_CURVELIST)
426 if (len > (int)(sizeof(etmp) - 1))
428 memcpy(etmp, elem, len);
430 nid = EC_curve_nist2nid(etmp);
431 if (nid == NID_undef)
432 nid = OBJ_sn2nid(etmp);
433 if (nid == NID_undef)
434 nid = OBJ_ln2nid(etmp);
435 if (nid == NID_undef)
437 for (i = 0; i < narg->nidcnt; i++)
438 if (narg->nid_arr[i] == nid)
440 narg->nid_arr[narg->nidcnt++] = nid;
443 /* Set curves based on a colon separate list */
444 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
449 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
451 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
453 /* For an EC key set TLS id and required compression based on parameters */
454 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
460 const EC_METHOD *meth;
463 /* Determine if it is a prime field */
464 grp = EC_KEY_get0_group(ec);
465 pt = EC_KEY_get0_public_key(ec);
468 meth = EC_GROUP_method_of(grp);
471 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
475 /* Determine curve ID */
476 id = EC_GROUP_get_curve_name(grp);
477 id = tls1_ec_nid2curve_id(id);
478 /* If we have an ID set it, otherwise set arbitrary explicit curve */
482 curve_id[1] = (unsigned char)id;
494 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
497 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
499 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
502 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
506 /* Check an EC key is compatible with extensions */
507 static int tls1_check_ec_key(SSL *s,
508 unsigned char *curve_id, unsigned char *comp_id)
510 const unsigned char *p;
513 /* If point formats extension present check it, otherwise everything
514 * is supported (see RFC4492).
516 if (comp_id && s->session->tlsext_ecpointformatlist)
518 p = s->session->tlsext_ecpointformatlist;
519 plen = s->session->tlsext_ecpointformatlist_length;
520 for (i = 0; i < plen; i++, p++)
528 /* Check curve is consistent with client and server preferences */
529 for (j = 0; j <= 1; j++)
531 tls1_get_curvelist(s, j, &p, &plen);
532 for (i = 0; i < plen; i+=2, p+=2)
534 if (p[0] == curve_id[0] && p[1] == curve_id[1])
542 /* Check EC server key is compatible with client extensions */
543 int tls1_check_ec_server_key(SSL *s)
546 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
548 unsigned char comp_id, curve_id[2];
549 if (!cpk->x509 || !cpk->privatekey)
551 pkey = X509_get_pubkey(cpk->x509);
554 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
558 return tls1_check_ec_key(s, curve_id, &comp_id);
560 /* Check EC temporary key is compatible with client extensions */
561 int tls1_check_ec_tmp_key(SSL *s)
563 unsigned char curve_id[2];
564 EC_KEY *ec = s->cert->ecdh_tmp;
565 if (s->cert->ecdh_tmp_auto)
567 /* Need a shared curve */
568 if (tls1_shared_curve(s, 0))
574 if (s->cert->ecdh_tmp_cb)
579 if (!tls1_set_ec_id(curve_id, NULL, ec))
581 return tls1_check_ec_key(s, curve_id, NULL);
584 #endif /* OPENSSL_NO_EC */
586 #ifndef OPENSSL_NO_TLSEXT
588 /* List of supported signature algorithms and hashes. Should make this
589 * customisable at some point, for now include everything we support.
592 #ifdef OPENSSL_NO_RSA
593 #define tlsext_sigalg_rsa(md) /* */
595 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
598 #ifdef OPENSSL_NO_DSA
599 #define tlsext_sigalg_dsa(md) /* */
601 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
604 #ifdef OPENSSL_NO_ECDSA
605 #define tlsext_sigalg_ecdsa(md) /* */
607 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
610 #define tlsext_sigalg(md) \
611 tlsext_sigalg_rsa(md) \
612 tlsext_sigalg_dsa(md) \
613 tlsext_sigalg_ecdsa(md)
615 static unsigned char tls12_sigalgs[] = {
616 #ifndef OPENSSL_NO_SHA512
617 tlsext_sigalg(TLSEXT_hash_sha512)
618 tlsext_sigalg(TLSEXT_hash_sha384)
620 #ifndef OPENSSL_NO_SHA256
621 tlsext_sigalg(TLSEXT_hash_sha256)
622 tlsext_sigalg(TLSEXT_hash_sha224)
624 #ifndef OPENSSL_NO_SHA
625 tlsext_sigalg(TLSEXT_hash_sha1)
627 #ifndef OPENSSL_NO_MD5
628 tlsext_sigalg_rsa(TLSEXT_hash_md5)
632 int tls12_get_req_sig_algs(SSL *s, unsigned char *p)
634 size_t slen = sizeof(tls12_sigalgs);
636 /* If FIPS mode don't include MD5 which is last */
641 memcpy(p, tls12_sigalgs, slen);
645 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
648 unsigned char *ret = p;
649 #ifndef OPENSSL_NO_EC
650 /* See if we support any ECC ciphersuites */
652 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
655 unsigned long alg_k, alg_a;
656 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
658 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
660 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
662 alg_k = c->algorithm_mkey;
663 alg_a = c->algorithm_auth;
664 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
665 || (alg_a & SSL_aECDSA)))
674 /* don't add extensions for SSLv3 unless doing secure renegotiation */
675 if (s->client_version == SSL3_VERSION
676 && !s->s3->send_connection_binding)
681 if (ret>=limit) return NULL; /* this really never occurs, but ... */
683 if (s->tlsext_hostname != NULL)
685 /* Add TLS extension servername to the Client Hello message */
686 unsigned long size_str;
689 /* check for enough space.
690 4 for the servername type and entension length
691 2 for servernamelist length
692 1 for the hostname type
693 2 for hostname length
697 if ((lenmax = limit - ret - 9) < 0
698 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
701 /* extension type and length */
702 s2n(TLSEXT_TYPE_server_name,ret);
705 /* length of servername list */
708 /* hostname type, length and hostname */
709 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
711 memcpy(ret, s->tlsext_hostname, size_str);
715 /* Add RI if renegotiating */
720 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
722 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
726 if((limit - p - 4 - el) < 0) return NULL;
728 s2n(TLSEXT_TYPE_renegotiate,ret);
731 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
733 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
740 #ifndef OPENSSL_NO_SRP
741 /* Add SRP username if there is one */
742 if (s->srp_ctx.login != NULL)
743 { /* Add TLS extension SRP username to the Client Hello message */
745 int login_len = strlen(s->srp_ctx.login);
746 if (login_len > 255 || login_len == 0)
748 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
752 /* check for enough space.
753 4 for the srp type type and entension length
754 1 for the srp user identity
755 + srp user identity length
757 if ((limit - ret - 5 - login_len) < 0) return NULL;
759 /* fill in the extension */
760 s2n(TLSEXT_TYPE_srp,ret);
761 s2n(login_len+1,ret);
762 (*ret++) = (unsigned char) login_len;
763 memcpy(ret, s->srp_ctx.login, login_len);
768 #ifndef OPENSSL_NO_EC
771 /* Add TLS extension ECPointFormats to the ClientHello message */
773 const unsigned char *plist;
775 /* If we have a custom point format list use it otherwise
777 plist = s->tlsext_ecpointformatlist;
779 plistlen = s->tlsext_ecpointformatlist_length;
782 plist = ecformats_default;
783 plistlen = sizeof(ecformats_default);
786 if ((lenmax = limit - ret - 5) < 0) return NULL;
787 if (plistlen > (size_t)lenmax) return NULL;
790 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
794 s2n(TLSEXT_TYPE_ec_point_formats,ret);
795 s2n(plistlen + 1,ret);
796 *(ret++) = (unsigned char)plistlen ;
797 memcpy(ret, plist, plistlen);
800 /* Add TLS extension EllipticCurves to the ClientHello message */
801 plist = s->tlsext_ellipticcurvelist;
802 tls1_get_curvelist(s, 0, &plist, &plistlen);
804 if ((lenmax = limit - ret - 6) < 0) return NULL;
805 if (plistlen > (size_t)lenmax) return NULL;
806 if (plistlen > 65532)
808 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
812 s2n(TLSEXT_TYPE_elliptic_curves,ret);
813 s2n(plistlen + 2, ret);
815 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
816 * elliptic_curve_list, but the examples use two bytes.
817 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
818 * resolves this to two bytes.
821 memcpy(ret, plist, plistlen);
824 #endif /* OPENSSL_NO_EC */
826 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
829 if (!s->new_session && s->session && s->session->tlsext_tick)
830 ticklen = s->session->tlsext_ticklen;
831 else if (s->session && s->tlsext_session_ticket &&
832 s->tlsext_session_ticket->data)
834 ticklen = s->tlsext_session_ticket->length;
835 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
836 if (!s->session->tlsext_tick)
838 memcpy(s->session->tlsext_tick,
839 s->tlsext_session_ticket->data,
841 s->session->tlsext_ticklen = ticklen;
845 if (ticklen == 0 && s->tlsext_session_ticket &&
846 s->tlsext_session_ticket->data == NULL)
848 /* Check for enough room 2 for extension type, 2 for len
851 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
852 s2n(TLSEXT_TYPE_session_ticket,ret);
856 memcpy(ret, s->session->tlsext_tick, ticklen);
862 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
864 if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6)
866 s2n(TLSEXT_TYPE_signature_algorithms,ret);
867 s2n(sizeof(tls12_sigalgs) + 2, ret);
868 s2n(sizeof(tls12_sigalgs), ret);
869 memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs));
870 ret += sizeof(tls12_sigalgs);
873 #ifdef TLSEXT_TYPE_opaque_prf_input
874 if (s->s3->client_opaque_prf_input != NULL &&
875 s->version != DTLS1_VERSION)
877 size_t col = s->s3->client_opaque_prf_input_len;
879 if ((long)(limit - ret - 6 - col < 0))
881 if (col > 0xFFFD) /* can't happen */
884 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
887 memcpy(ret, s->s3->client_opaque_prf_input, col);
892 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
893 s->version != DTLS1_VERSION)
896 long extlen, idlen, itmp;
900 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
902 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
903 itmp = i2d_OCSP_RESPID(id, NULL);
909 if (s->tlsext_ocsp_exts)
911 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
918 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
919 s2n(TLSEXT_TYPE_status_request, ret);
920 if (extlen + idlen > 0xFFF0)
922 s2n(extlen + idlen + 5, ret);
923 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
925 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
927 /* save position of id len */
928 unsigned char *q = ret;
929 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
930 /* skip over id len */
932 itmp = i2d_OCSP_RESPID(id, &ret);
938 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
941 #ifndef OPENSSL_NO_HEARTBEATS
942 /* Add Heartbeat extension */
943 s2n(TLSEXT_TYPE_heartbeat,ret);
946 * 1: peer may send requests
947 * 2: peer not allowed to send requests
949 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
950 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
952 *(ret++) = SSL_TLSEXT_HB_ENABLED;
955 #ifndef OPENSSL_NO_NEXTPROTONEG
956 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
958 /* The client advertises an emtpy extension to indicate its
959 * support for Next Protocol Negotiation */
960 if (limit - ret - 4 < 0)
962 s2n(TLSEXT_TYPE_next_proto_neg,ret);
967 if(SSL_get_srtp_profiles(s))
971 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
973 if((limit - p - 4 - el) < 0) return NULL;
975 s2n(TLSEXT_TYPE_use_srtp,ret);
978 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
980 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
986 if ((extdatalen = ret-p-2)== 0)
993 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
996 unsigned char *ret = p;
997 #ifndef OPENSSL_NO_NEXTPROTONEG
998 int next_proto_neg_seen;
1001 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1002 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1006 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1008 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1010 if ((long)(limit - ret - 4) < 0) return NULL;
1012 s2n(TLSEXT_TYPE_server_name,ret);
1016 if(s->s3->send_connection_binding)
1020 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1022 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1026 if((limit - p - 4 - el) < 0) return NULL;
1028 s2n(TLSEXT_TYPE_renegotiate,ret);
1031 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1033 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1040 #ifndef OPENSSL_NO_EC
1041 if (s->tlsext_ecpointformatlist != NULL &&
1042 s->version != DTLS1_VERSION)
1044 /* Add TLS extension ECPointFormats to the ServerHello message */
1047 if ((lenmax = limit - ret - 5) < 0) return NULL;
1048 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1049 if (s->tlsext_ecpointformatlist_length > 255)
1051 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1055 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1056 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1057 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1058 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1059 ret+=s->tlsext_ecpointformatlist_length;
1062 /* Currently the server should not respond with a SupportedCurves extension */
1063 #endif /* OPENSSL_NO_EC */
1065 if (s->tlsext_ticket_expected
1066 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1068 if ((long)(limit - ret - 4) < 0) return NULL;
1069 s2n(TLSEXT_TYPE_session_ticket,ret);
1073 if (s->tlsext_status_expected)
1075 if ((long)(limit - ret - 4) < 0) return NULL;
1076 s2n(TLSEXT_TYPE_status_request,ret);
1080 #ifdef TLSEXT_TYPE_opaque_prf_input
1081 if (s->s3->server_opaque_prf_input != NULL &&
1082 s->version != DTLS1_VERSION)
1084 size_t sol = s->s3->server_opaque_prf_input_len;
1086 if ((long)(limit - ret - 6 - sol) < 0)
1088 if (sol > 0xFFFD) /* can't happen */
1091 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1094 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1103 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1105 if((limit - p - 4 - el) < 0) return NULL;
1107 s2n(TLSEXT_TYPE_use_srtp,ret);
1110 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1112 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1118 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1119 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1120 { const unsigned char cryptopro_ext[36] = {
1121 0xfd, 0xe8, /*65000*/
1122 0x00, 0x20, /*32 bytes length*/
1123 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1124 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1125 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1126 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1127 if (limit-ret<36) return NULL;
1128 memcpy(ret,cryptopro_ext,36);
1133 #ifndef OPENSSL_NO_HEARTBEATS
1134 /* Add Heartbeat extension if we've received one */
1135 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1137 s2n(TLSEXT_TYPE_heartbeat,ret);
1140 * 1: peer may send requests
1141 * 2: peer not allowed to send requests
1143 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1144 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1146 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1151 #ifndef OPENSSL_NO_NEXTPROTONEG
1152 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1153 s->s3->next_proto_neg_seen = 0;
1154 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1156 const unsigned char *npa;
1157 unsigned int npalen;
1160 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1161 if (r == SSL_TLSEXT_ERR_OK)
1163 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1164 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1166 memcpy(ret, npa, npalen);
1168 s->s3->next_proto_neg_seen = 1;
1173 if ((extdatalen = ret-p-2)== 0)
1180 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1182 unsigned short type;
1183 unsigned short size;
1185 unsigned char *data = *p;
1186 int renegotiate_seen = 0;
1187 int sigalg_seen = 0;
1189 s->servername_done = 0;
1190 s->tlsext_status_type = -1;
1191 #ifndef OPENSSL_NO_NEXTPROTONEG
1192 s->s3->next_proto_neg_seen = 0;
1195 #ifndef OPENSSL_NO_HEARTBEATS
1196 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1197 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1200 if (data >= (d+n-2))
1204 if (data > (d+n-len))
1207 while (data <= (d+n-4))
1212 if (data+size > (d+n))
1215 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1217 if (s->tlsext_debug_cb)
1218 s->tlsext_debug_cb(s, 0, type, data, size,
1219 s->tlsext_debug_arg);
1220 /* The servername extension is treated as follows:
1222 - Only the hostname type is supported with a maximum length of 255.
1223 - The servername is rejected if too long or if it contains zeros,
1224 in which case an fatal alert is generated.
1225 - The servername field is maintained together with the session cache.
1226 - When a session is resumed, the servername call back invoked in order
1227 to allow the application to position itself to the right context.
1228 - The servername is acknowledged if it is new for a session or when
1229 it is identical to a previously used for the same session.
1230 Applications can control the behaviour. They can at any time
1231 set a 'desirable' servername for a new SSL object. This can be the
1232 case for example with HTTPS when a Host: header field is received and
1233 a renegotiation is requested. In this case, a possible servername
1234 presented in the new client hello is only acknowledged if it matches
1235 the value of the Host: field.
1236 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1237 if they provide for changing an explicit servername context for the session,
1238 i.e. when the session has been established with a servername extension.
1239 - On session reconnect, the servername extension may be absent.
1243 if (type == TLSEXT_TYPE_server_name)
1245 unsigned char *sdata;
1251 *al = SSL_AD_DECODE_ERROR;
1258 *al = SSL_AD_DECODE_ERROR;
1265 servname_type = *(sdata++);
1271 *al = SSL_AD_DECODE_ERROR;
1274 if (s->servername_done == 0)
1275 switch (servname_type)
1277 case TLSEXT_NAMETYPE_host_name:
1280 if(s->session->tlsext_hostname)
1282 *al = SSL_AD_DECODE_ERROR;
1285 if (len > TLSEXT_MAXLEN_host_name)
1287 *al = TLS1_AD_UNRECOGNIZED_NAME;
1290 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1292 *al = TLS1_AD_INTERNAL_ERROR;
1295 memcpy(s->session->tlsext_hostname, sdata, len);
1296 s->session->tlsext_hostname[len]='\0';
1297 if (strlen(s->session->tlsext_hostname) != len) {
1298 OPENSSL_free(s->session->tlsext_hostname);
1299 s->session->tlsext_hostname = NULL;
1300 *al = TLS1_AD_UNRECOGNIZED_NAME;
1303 s->servername_done = 1;
1307 s->servername_done = s->session->tlsext_hostname
1308 && strlen(s->session->tlsext_hostname) == len
1309 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1321 *al = SSL_AD_DECODE_ERROR;
1326 #ifndef OPENSSL_NO_SRP
1327 else if (type == TLSEXT_TYPE_srp)
1329 if (size <= 0 || ((len = data[0])) != (size -1))
1331 *al = SSL_AD_DECODE_ERROR;
1334 if (s->srp_ctx.login != NULL)
1336 *al = SSL_AD_DECODE_ERROR;
1339 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1341 memcpy(s->srp_ctx.login, &data[1], len);
1342 s->srp_ctx.login[len]='\0';
1344 if (strlen(s->srp_ctx.login) != len)
1346 *al = SSL_AD_DECODE_ERROR;
1352 #ifndef OPENSSL_NO_EC
1353 else if (type == TLSEXT_TYPE_ec_point_formats &&
1354 s->version != DTLS1_VERSION)
1356 unsigned char *sdata = data;
1357 int ecpointformatlist_length = *(sdata++);
1359 if (ecpointformatlist_length != size - 1)
1361 *al = TLS1_AD_DECODE_ERROR;
1366 if(s->session->tlsext_ecpointformatlist)
1368 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1369 s->session->tlsext_ecpointformatlist = NULL;
1371 s->session->tlsext_ecpointformatlist_length = 0;
1372 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1374 *al = TLS1_AD_INTERNAL_ERROR;
1377 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1378 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1381 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1382 sdata = s->session->tlsext_ecpointformatlist;
1383 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1384 fprintf(stderr,"%i ",*(sdata++));
1385 fprintf(stderr,"\n");
1388 else if (type == TLSEXT_TYPE_elliptic_curves &&
1389 s->version != DTLS1_VERSION)
1391 unsigned char *sdata = data;
1392 int ellipticcurvelist_length = (*(sdata++) << 8);
1393 ellipticcurvelist_length += (*(sdata++));
1395 if (ellipticcurvelist_length != size - 2)
1397 *al = TLS1_AD_DECODE_ERROR;
1402 if(s->session->tlsext_ellipticcurvelist)
1404 *al = TLS1_AD_DECODE_ERROR;
1407 s->session->tlsext_ellipticcurvelist_length = 0;
1408 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1410 *al = TLS1_AD_INTERNAL_ERROR;
1413 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1414 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1417 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1418 sdata = s->session->tlsext_ellipticcurvelist;
1419 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1420 fprintf(stderr,"%i ",*(sdata++));
1421 fprintf(stderr,"\n");
1424 #endif /* OPENSSL_NO_EC */
1425 #ifdef TLSEXT_TYPE_opaque_prf_input
1426 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1427 s->version != DTLS1_VERSION)
1429 unsigned char *sdata = data;
1433 *al = SSL_AD_DECODE_ERROR;
1436 n2s(sdata, s->s3->client_opaque_prf_input_len);
1437 if (s->s3->client_opaque_prf_input_len != size - 2)
1439 *al = SSL_AD_DECODE_ERROR;
1443 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1444 OPENSSL_free(s->s3->client_opaque_prf_input);
1445 if (s->s3->client_opaque_prf_input_len == 0)
1446 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1448 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1449 if (s->s3->client_opaque_prf_input == NULL)
1451 *al = TLS1_AD_INTERNAL_ERROR;
1456 else if (type == TLSEXT_TYPE_session_ticket)
1458 if (s->tls_session_ticket_ext_cb &&
1459 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1461 *al = TLS1_AD_INTERNAL_ERROR;
1465 else if (type == TLSEXT_TYPE_renegotiate)
1467 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1469 renegotiate_seen = 1;
1471 else if (type == TLSEXT_TYPE_signature_algorithms)
1474 if (sigalg_seen || size < 2)
1476 *al = SSL_AD_DECODE_ERROR;
1482 if (dsize != size || dsize & 1)
1484 *al = SSL_AD_DECODE_ERROR;
1487 if (!tls1_process_sigalgs(s, data, dsize))
1489 *al = SSL_AD_DECODE_ERROR;
1493 else if (type == TLSEXT_TYPE_status_request &&
1494 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1499 *al = SSL_AD_DECODE_ERROR;
1503 s->tlsext_status_type = *data++;
1505 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1507 const unsigned char *sdata;
1509 /* Read in responder_id_list */
1514 *al = SSL_AD_DECODE_ERROR;
1523 *al = SSL_AD_DECODE_ERROR;
1527 dsize -= 2 + idsize;
1531 *al = SSL_AD_DECODE_ERROR;
1536 id = d2i_OCSP_RESPID(NULL,
1540 *al = SSL_AD_DECODE_ERROR;
1545 OCSP_RESPID_free(id);
1546 *al = SSL_AD_DECODE_ERROR;
1549 if (!s->tlsext_ocsp_ids
1550 && !(s->tlsext_ocsp_ids =
1551 sk_OCSP_RESPID_new_null()))
1553 OCSP_RESPID_free(id);
1554 *al = SSL_AD_INTERNAL_ERROR;
1557 if (!sk_OCSP_RESPID_push(
1558 s->tlsext_ocsp_ids, id))
1560 OCSP_RESPID_free(id);
1561 *al = SSL_AD_INTERNAL_ERROR;
1566 /* Read in request_extensions */
1569 *al = SSL_AD_DECODE_ERROR;
1576 *al = SSL_AD_DECODE_ERROR;
1582 if (s->tlsext_ocsp_exts)
1584 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1585 X509_EXTENSION_free);
1588 s->tlsext_ocsp_exts =
1589 d2i_X509_EXTENSIONS(NULL,
1591 if (!s->tlsext_ocsp_exts
1592 || (data + dsize != sdata))
1594 *al = SSL_AD_DECODE_ERROR;
1599 /* We don't know what to do with any other type
1603 s->tlsext_status_type = -1;
1605 #ifndef OPENSSL_NO_HEARTBEATS
1606 else if (type == TLSEXT_TYPE_heartbeat)
1610 case 0x01: /* Client allows us to send HB requests */
1611 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1613 case 0x02: /* Client doesn't accept HB requests */
1614 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1615 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1617 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1622 #ifndef OPENSSL_NO_NEXTPROTONEG
1623 else if (type == TLSEXT_TYPE_next_proto_neg &&
1624 s->s3->tmp.finish_md_len == 0)
1626 /* We shouldn't accept this extension on a
1629 * s->new_session will be set on renegotiation, but we
1630 * probably shouldn't rely that it couldn't be set on
1631 * the initial renegotation too in certain cases (when
1632 * there's some other reason to disallow resuming an
1633 * earlier session -- the current code won't be doing
1634 * anything like that, but this might change).
1636 * A valid sign that there's been a previous handshake
1637 * in this connection is if s->s3->tmp.finish_md_len >
1638 * 0. (We are talking about a check that will happen
1639 * in the Hello protocol round, well before a new
1640 * Finished message could have been computed.) */
1641 s->s3->next_proto_neg_seen = 1;
1645 /* session ticket processed earlier */
1646 else if (type == TLSEXT_TYPE_use_srtp)
1648 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1660 /* Need RI if renegotiating */
1662 if (!renegotiate_seen && s->renegotiate &&
1663 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1665 *al = SSL_AD_HANDSHAKE_FAILURE;
1666 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1667 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1674 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1677 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1679 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1683 if (ssl_check_clienthello_tlsext(s) <= 0)
1685 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1691 #ifndef OPENSSL_NO_NEXTPROTONEG
1692 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1693 * elements of zero length are allowed and the set of elements must exactly fill
1694 * the length of the block. */
1695 static int ssl_next_proto_validate(unsigned char *d, unsigned len)
1697 unsigned int off = 0;
1711 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1713 unsigned short length;
1714 unsigned short type;
1715 unsigned short size;
1716 unsigned char *data = *p;
1717 int tlsext_servername = 0;
1718 int renegotiate_seen = 0;
1720 #ifndef OPENSSL_NO_NEXTPROTONEG
1721 s->s3->next_proto_neg_seen = 0;
1724 #ifndef OPENSSL_NO_HEARTBEATS
1725 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1726 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1729 if (data >= (d+n-2))
1733 if (data+length != d+n)
1735 *al = SSL_AD_DECODE_ERROR;
1739 while(data <= (d+n-4))
1744 if (data+size > (d+n))
1747 if (s->tlsext_debug_cb)
1748 s->tlsext_debug_cb(s, 1, type, data, size,
1749 s->tlsext_debug_arg);
1751 if (type == TLSEXT_TYPE_server_name)
1753 if (s->tlsext_hostname == NULL || size > 0)
1755 *al = TLS1_AD_UNRECOGNIZED_NAME;
1758 tlsext_servername = 1;
1761 #ifndef OPENSSL_NO_EC
1762 else if (type == TLSEXT_TYPE_ec_point_formats &&
1763 s->version != DTLS1_VERSION)
1765 unsigned char *sdata = data;
1766 int ecpointformatlist_length = *(sdata++);
1768 if (ecpointformatlist_length != size - 1)
1770 *al = TLS1_AD_DECODE_ERROR;
1773 s->session->tlsext_ecpointformatlist_length = 0;
1774 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1775 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1777 *al = TLS1_AD_INTERNAL_ERROR;
1780 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1781 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1783 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1784 sdata = s->session->tlsext_ecpointformatlist;
1785 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1786 fprintf(stderr,"%i ",*(sdata++));
1787 fprintf(stderr,"\n");
1790 #endif /* OPENSSL_NO_EC */
1792 else if (type == TLSEXT_TYPE_session_ticket)
1794 if (s->tls_session_ticket_ext_cb &&
1795 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1797 *al = TLS1_AD_INTERNAL_ERROR;
1800 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1803 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1806 s->tlsext_ticket_expected = 1;
1808 #ifdef TLSEXT_TYPE_opaque_prf_input
1809 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1810 s->version != DTLS1_VERSION)
1812 unsigned char *sdata = data;
1816 *al = SSL_AD_DECODE_ERROR;
1819 n2s(sdata, s->s3->server_opaque_prf_input_len);
1820 if (s->s3->server_opaque_prf_input_len != size - 2)
1822 *al = SSL_AD_DECODE_ERROR;
1826 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1827 OPENSSL_free(s->s3->server_opaque_prf_input);
1828 if (s->s3->server_opaque_prf_input_len == 0)
1829 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1831 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1833 if (s->s3->server_opaque_prf_input == NULL)
1835 *al = TLS1_AD_INTERNAL_ERROR;
1840 else if (type == TLSEXT_TYPE_status_request &&
1841 s->version != DTLS1_VERSION)
1843 /* MUST be empty and only sent if we've requested
1844 * a status request message.
1846 if ((s->tlsext_status_type == -1) || (size > 0))
1848 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1851 /* Set flag to expect CertificateStatus message */
1852 s->tlsext_status_expected = 1;
1854 #ifndef OPENSSL_NO_NEXTPROTONEG
1855 else if (type == TLSEXT_TYPE_next_proto_neg &&
1856 s->s3->tmp.finish_md_len == 0)
1858 unsigned char *selected;
1859 unsigned char selected_len;
1861 /* We must have requested it. */
1862 if ((s->ctx->next_proto_select_cb == NULL))
1864 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1867 /* The data must be valid */
1868 if (!ssl_next_proto_validate(data, size))
1870 *al = TLS1_AD_DECODE_ERROR;
1873 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
1875 *al = TLS1_AD_INTERNAL_ERROR;
1878 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
1879 if (!s->next_proto_negotiated)
1881 *al = TLS1_AD_INTERNAL_ERROR;
1884 memcpy(s->next_proto_negotiated, selected, selected_len);
1885 s->next_proto_negotiated_len = selected_len;
1886 s->s3->next_proto_neg_seen = 1;
1889 else if (type == TLSEXT_TYPE_renegotiate)
1891 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1893 renegotiate_seen = 1;
1895 #ifndef OPENSSL_NO_HEARTBEATS
1896 else if (type == TLSEXT_TYPE_heartbeat)
1900 case 0x01: /* Server allows us to send HB requests */
1901 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1903 case 0x02: /* Server doesn't accept HB requests */
1904 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1905 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1907 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1912 else if (type == TLSEXT_TYPE_use_srtp)
1914 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
1924 *al = SSL_AD_DECODE_ERROR;
1928 if (!s->hit && tlsext_servername == 1)
1930 if (s->tlsext_hostname)
1932 if (s->session->tlsext_hostname == NULL)
1934 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1935 if (!s->session->tlsext_hostname)
1937 *al = SSL_AD_UNRECOGNIZED_NAME;
1943 *al = SSL_AD_DECODE_ERROR;
1953 /* Determine if we need to see RI. Strictly speaking if we want to
1954 * avoid an attack we should *always* see RI even on initial server
1955 * hello because the client doesn't see any renegotiation during an
1956 * attack. However this would mean we could not connect to any server
1957 * which doesn't support RI so for the immediate future tolerate RI
1958 * absence on initial connect only.
1960 if (!renegotiate_seen
1961 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1962 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1964 *al = SSL_AD_HANDSHAKE_FAILURE;
1965 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
1966 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1974 int ssl_prepare_clienthello_tlsext(SSL *s)
1977 #ifdef TLSEXT_TYPE_opaque_prf_input
1981 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1983 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1988 if (s->tlsext_opaque_prf_input != NULL)
1990 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1991 OPENSSL_free(s->s3->client_opaque_prf_input);
1993 if (s->tlsext_opaque_prf_input_len == 0)
1994 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1996 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1997 if (s->s3->client_opaque_prf_input == NULL)
1999 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2002 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2006 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2007 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2014 int ssl_prepare_serverhello_tlsext(SSL *s)
2016 #ifndef OPENSSL_NO_EC
2017 /* If we are server and using an ECC cipher suite, send the point formats we support
2018 * if the client sent us an ECPointsFormat extension. Note that the server is not
2019 * supposed to send an EllipticCurves extension.
2022 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2023 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2024 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2025 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2029 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2030 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2032 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2035 s->tlsext_ecpointformatlist_length = 3;
2036 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2037 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2038 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2040 #endif /* OPENSSL_NO_EC */
2045 static int ssl_check_clienthello_tlsext(SSL *s)
2047 int ret=SSL_TLSEXT_ERR_NOACK;
2048 int al = SSL_AD_UNRECOGNIZED_NAME;
2050 #ifndef OPENSSL_NO_EC
2051 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2052 * ssl3_choose_cipher in s3_lib.c.
2054 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2055 * ssl3_choose_cipher in s3_lib.c.
2059 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2060 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2061 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2062 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2064 /* If status request then ask callback what to do.
2065 * Note: this must be called after servername callbacks in case
2066 * the certificate has changed.
2068 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2071 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2074 /* We don't want to send a status request response */
2075 case SSL_TLSEXT_ERR_NOACK:
2076 s->tlsext_status_expected = 0;
2078 /* status request response should be sent */
2079 case SSL_TLSEXT_ERR_OK:
2080 if (s->tlsext_ocsp_resp)
2081 s->tlsext_status_expected = 1;
2083 s->tlsext_status_expected = 0;
2085 /* something bad happened */
2086 case SSL_TLSEXT_ERR_ALERT_FATAL:
2087 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2088 al = SSL_AD_INTERNAL_ERROR;
2093 s->tlsext_status_expected = 0;
2095 #ifdef TLSEXT_TYPE_opaque_prf_input
2097 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2098 * but we might be sending an alert in response to the client hello,
2099 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2103 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2105 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2108 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2109 al = SSL_AD_INTERNAL_ERROR;
2114 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2115 OPENSSL_free(s->s3->server_opaque_prf_input);
2116 s->s3->server_opaque_prf_input = NULL;
2118 if (s->tlsext_opaque_prf_input != NULL)
2120 if (s->s3->client_opaque_prf_input != NULL &&
2121 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2123 /* can only use this extension if we have a server opaque PRF input
2124 * of the same length as the client opaque PRF input! */
2126 if (s->tlsext_opaque_prf_input_len == 0)
2127 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2129 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2130 if (s->s3->server_opaque_prf_input == NULL)
2132 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2133 al = SSL_AD_INTERNAL_ERROR;
2136 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2140 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2142 /* The callback wants to enforce use of the extension,
2143 * but we can't do that with the client opaque PRF input;
2144 * abort the handshake.
2146 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2147 al = SSL_AD_HANDSHAKE_FAILURE;
2155 case SSL_TLSEXT_ERR_ALERT_FATAL:
2156 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2159 case SSL_TLSEXT_ERR_ALERT_WARNING:
2160 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2163 case SSL_TLSEXT_ERR_NOACK:
2164 s->servername_done=0;
2170 int ssl_check_serverhello_tlsext(SSL *s)
2172 int ret=SSL_TLSEXT_ERR_NOACK;
2173 int al = SSL_AD_UNRECOGNIZED_NAME;
2175 #ifndef OPENSSL_NO_EC
2176 /* If we are client and using an elliptic curve cryptography cipher
2177 * suite, then if server returns an EC point formats lists extension
2178 * it must contain uncompressed.
2180 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2181 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2182 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2183 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2184 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2186 /* we are using an ECC cipher */
2188 unsigned char *list;
2189 int found_uncompressed = 0;
2190 list = s->session->tlsext_ecpointformatlist;
2191 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2193 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2195 found_uncompressed = 1;
2199 if (!found_uncompressed)
2201 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2205 ret = SSL_TLSEXT_ERR_OK;
2206 #endif /* OPENSSL_NO_EC */
2208 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2209 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2210 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2211 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2213 #ifdef TLSEXT_TYPE_opaque_prf_input
2214 if (s->s3->server_opaque_prf_input_len > 0)
2216 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2217 * So first verify that we really have a value from the server too. */
2219 if (s->s3->server_opaque_prf_input == NULL)
2221 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2222 al = SSL_AD_HANDSHAKE_FAILURE;
2225 /* Anytime the server *has* sent an opaque PRF input, we need to check
2226 * that we have a client opaque PRF input of the same size. */
2227 if (s->s3->client_opaque_prf_input == NULL ||
2228 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2230 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2231 al = SSL_AD_ILLEGAL_PARAMETER;
2236 /* If we've requested certificate status and we wont get one
2239 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2240 && s->ctx && s->ctx->tlsext_status_cb)
2243 /* Set resp to NULL, resplen to -1 so callback knows
2244 * there is no response.
2246 if (s->tlsext_ocsp_resp)
2248 OPENSSL_free(s->tlsext_ocsp_resp);
2249 s->tlsext_ocsp_resp = NULL;
2251 s->tlsext_ocsp_resplen = -1;
2252 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2255 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2256 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2260 al = SSL_AD_INTERNAL_ERROR;
2261 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2267 case SSL_TLSEXT_ERR_ALERT_FATAL:
2268 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2271 case SSL_TLSEXT_ERR_ALERT_WARNING:
2272 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2275 case SSL_TLSEXT_ERR_NOACK:
2276 s->servername_done=0;
2282 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2285 if (s->version < SSL3_VERSION)
2287 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2289 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2293 if (ssl_check_serverhello_tlsext(s) <= 0)
2295 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2301 /* Since the server cache lookup is done early on in the processing of the
2302 * ClientHello, and other operations depend on the result, we need to handle
2303 * any TLS session ticket extension at the same time.
2305 * session_id: points at the session ID in the ClientHello. This code will
2306 * read past the end of this in order to parse out the session ticket
2307 * extension, if any.
2308 * len: the length of the session ID.
2309 * limit: a pointer to the first byte after the ClientHello.
2310 * ret: (output) on return, if a ticket was decrypted, then this is set to
2311 * point to the resulting session.
2313 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2314 * ciphersuite, in which case we have no use for session tickets and one will
2315 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2318 * -1: fatal error, either from parsing or decrypting the ticket.
2319 * 0: no ticket was found (or was ignored, based on settings).
2320 * 1: a zero length extension was found, indicating that the client supports
2321 * session tickets but doesn't currently have one to offer.
2322 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2323 * couldn't be decrypted because of a non-fatal error.
2324 * 3: a ticket was successfully decrypted and *ret was set.
2327 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2328 * a new session ticket to the client because the client indicated support
2329 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2330 * a session ticket or we couldn't use the one it gave us, or if
2331 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2332 * Otherwise, s->tlsext_ticket_expected is set to 0.
2334 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2335 const unsigned char *limit, SSL_SESSION **ret)
2337 /* Point after session ID in client hello */
2338 const unsigned char *p = session_id + len;
2342 s->tlsext_ticket_expected = 0;
2344 /* If tickets disabled behave as if no ticket present
2345 * to permit stateful resumption.
2347 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2349 if ((s->version <= SSL3_VERSION) || !limit)
2353 /* Skip past DTLS cookie */
2354 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2361 /* Skip past cipher list */
2366 /* Skip past compression algorithm list */
2371 /* Now at start of extensions */
2372 if ((p + 2) >= limit)
2375 while ((p + 4) <= limit)
2377 unsigned short type, size;
2380 if (p + size > limit)
2382 if (type == TLSEXT_TYPE_session_ticket)
2387 /* The client will accept a ticket but doesn't
2388 * currently have one. */
2389 s->tlsext_ticket_expected = 1;
2392 if (s->tls_session_secret_cb)
2394 /* Indicate that the ticket couldn't be
2395 * decrypted rather than generating the session
2396 * from ticket now, trigger abbreviated
2397 * handshake based on external mechanism to
2398 * calculate the master secret later. */
2401 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2404 case 2: /* ticket couldn't be decrypted */
2405 s->tlsext_ticket_expected = 1;
2407 case 3: /* ticket was decrypted */
2409 case 4: /* ticket decrypted but need to renew */
2410 s->tlsext_ticket_expected = 1;
2412 default: /* fatal error */
2421 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2423 * etick: points to the body of the session ticket extension.
2424 * eticklen: the length of the session tickets extenion.
2425 * sess_id: points at the session ID.
2426 * sesslen: the length of the session ID.
2427 * psess: (output) on return, if a ticket was decrypted, then this is set to
2428 * point to the resulting session.
2431 * -1: fatal error, either from parsing or decrypting the ticket.
2432 * 2: the ticket couldn't be decrypted.
2433 * 3: a ticket was successfully decrypted and *psess was set.
2434 * 4: same as 3, but the ticket needs to be renewed.
2436 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2437 const unsigned char *sess_id, int sesslen,
2438 SSL_SESSION **psess)
2441 unsigned char *sdec;
2442 const unsigned char *p;
2443 int slen, mlen, renew_ticket = 0;
2444 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2447 SSL_CTX *tctx = s->initial_ctx;
2448 /* Need at least keyname + iv + some encrypted data */
2451 /* Initialize session ticket encryption and HMAC contexts */
2452 HMAC_CTX_init(&hctx);
2453 EVP_CIPHER_CTX_init(&ctx);
2454 if (tctx->tlsext_ticket_key_cb)
2456 unsigned char *nctick = (unsigned char *)etick;
2457 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2468 /* Check key name matches */
2469 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2471 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2472 tlsext_tick_md(), NULL);
2473 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2474 tctx->tlsext_tick_aes_key, etick + 16);
2476 /* Attempt to process session ticket, first conduct sanity and
2477 * integrity checks on ticket.
2479 mlen = HMAC_size(&hctx);
2482 EVP_CIPHER_CTX_cleanup(&ctx);
2486 /* Check HMAC of encrypted ticket */
2487 HMAC_Update(&hctx, etick, eticklen);
2488 HMAC_Final(&hctx, tick_hmac, NULL);
2489 HMAC_CTX_cleanup(&hctx);
2490 if (memcmp(tick_hmac, etick + eticklen, mlen))
2492 /* Attempt to decrypt session data */
2493 /* Move p after IV to start of encrypted ticket, update length */
2494 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2495 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2496 sdec = OPENSSL_malloc(eticklen);
2499 EVP_CIPHER_CTX_cleanup(&ctx);
2502 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2503 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2506 EVP_CIPHER_CTX_cleanup(&ctx);
2509 sess = d2i_SSL_SESSION(NULL, &p, slen);
2513 /* The session ID, if non-empty, is used by some clients to
2514 * detect that the ticket has been accepted. So we copy it to
2515 * the session structure. If it is empty set length to zero
2516 * as required by standard.
2519 memcpy(sess->session_id, sess_id, sesslen);
2520 sess->session_id_length = sesslen;
2528 /* For session parse failure, indicate that we need to send a new
2533 /* Tables to translate from NIDs to TLS v1.2 ids */
2541 static tls12_lookup tls12_md[] = {
2542 {NID_md5, TLSEXT_hash_md5},
2543 {NID_sha1, TLSEXT_hash_sha1},
2544 {NID_sha224, TLSEXT_hash_sha224},
2545 {NID_sha256, TLSEXT_hash_sha256},
2546 {NID_sha384, TLSEXT_hash_sha384},
2547 {NID_sha512, TLSEXT_hash_sha512}
2550 static tls12_lookup tls12_sig[] = {
2551 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2552 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2553 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2556 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2559 for (i = 0; i < tlen; i++)
2561 if (table[i].nid == nid)
2567 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2570 for (i = 0; i < tlen; i++)
2572 if ((table[i].id) == id)
2573 return table[i].nid;
2578 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2583 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2584 sizeof(tls12_md)/sizeof(tls12_lookup));
2587 sig_id = tls12_get_sigid(pk);
2590 p[0] = (unsigned char)md_id;
2591 p[1] = (unsigned char)sig_id;
2595 int tls12_get_sigid(const EVP_PKEY *pk)
2597 return tls12_find_id(pk->type, tls12_sig,
2598 sizeof(tls12_sig)/sizeof(tls12_lookup));
2601 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2605 #ifndef OPENSSL_NO_MD5
2606 case TLSEXT_hash_md5:
2613 #ifndef OPENSSL_NO_SHA
2614 case TLSEXT_hash_sha1:
2617 #ifndef OPENSSL_NO_SHA256
2618 case TLSEXT_hash_sha224:
2619 return EVP_sha224();
2621 case TLSEXT_hash_sha256:
2622 return EVP_sha256();
2624 #ifndef OPENSSL_NO_SHA512
2625 case TLSEXT_hash_sha384:
2626 return EVP_sha384();
2628 case TLSEXT_hash_sha512:
2629 return EVP_sha512();
2637 /* Set preferred digest for each key type */
2639 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
2644 TLS_SIGALGS *sigptr;
2645 /* Extension ignored for TLS versions below 1.2 */
2646 if (TLS1_get_version(s) < TLS1_2_VERSION)
2648 /* Should never happen */
2652 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2653 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2654 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2655 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2658 OPENSSL_free(c->sigalgs);
2659 c->sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS));
2662 c->sigalgslen = dsize/2;
2664 for (i = 0, sigptr = c->sigalgs; i < dsize; i += 2, sigptr++)
2666 sigptr->rhash = data[i];
2667 sigptr->rsign = data[i + 1];
2668 sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md,
2669 sizeof(tls12_md)/sizeof(tls12_lookup));
2670 sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig,
2671 sizeof(tls12_sig)/sizeof(tls12_lookup));
2672 if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid,
2675 sigptr->signandhash_nid = NID_undef;
2676 switch(sigptr->rsign)
2678 #ifndef OPENSSL_NO_RSA
2679 case TLSEXT_signature_rsa:
2680 idx = SSL_PKEY_RSA_SIGN;
2683 #ifndef OPENSSL_NO_DSA
2684 case TLSEXT_signature_dsa:
2685 idx = SSL_PKEY_DSA_SIGN;
2688 #ifndef OPENSSL_NO_ECDSA
2689 case TLSEXT_signature_ecdsa:
2697 if (c->pkeys[idx].digest == NULL)
2699 md = tls12_get_hash(sigptr->rhash);
2702 c->pkeys[idx].digest = md;
2703 if (idx == SSL_PKEY_RSA_SIGN)
2704 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2711 /* Set any remaining keys to default values. NOTE: if alg is not
2712 * supported it stays as NULL.
2714 #ifndef OPENSSL_NO_DSA
2715 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2716 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
2718 #ifndef OPENSSL_NO_RSA
2719 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
2721 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2722 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2725 #ifndef OPENSSL_NO_ECDSA
2726 if (!c->pkeys[SSL_PKEY_ECC].digest)
2727 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
2734 int SSL_get_sigalgs(SSL *s, int idx,
2735 int *psign, int *phash, int *psignandhash,
2736 unsigned char *rsig, unsigned char *rhash)
2738 if (s->cert->sigalgs == NULL)
2743 if (idx >= (int)s->cert->sigalgslen)
2745 psig = s->cert->sigalgs + idx;
2747 *psign = psig->sign_nid;
2749 *phash = psig->hash_nid;
2751 *psignandhash = psig->signandhash_nid;
2753 *rsig = psig->rsign;
2755 *rhash = psig->rhash;
2757 return s->cert->sigalgslen;
2761 #ifndef OPENSSL_NO_HEARTBEATS
2763 tls1_process_heartbeat(SSL *s)
2765 unsigned char *p = &s->s3->rrec.data[0], *pl;
2766 unsigned short hbtype;
2767 unsigned int payload;
2768 unsigned int padding = 16; /* Use minimum padding */
2770 /* Read type and payload length first */
2775 if (s->msg_callback)
2776 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
2777 &s->s3->rrec.data[0], s->s3->rrec.length,
2778 s, s->msg_callback_arg);
2780 if (hbtype == TLS1_HB_REQUEST)
2782 unsigned char *buffer, *bp;
2785 /* Allocate memory for the response, size is 1 bytes
2786 * message type, plus 2 bytes payload length, plus
2787 * payload, plus padding
2789 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
2792 /* Enter response type, length and copy payload */
2793 *bp++ = TLS1_HB_RESPONSE;
2795 memcpy(bp, pl, payload);
2797 /* Random padding */
2798 RAND_pseudo_bytes(bp, padding);
2800 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
2802 if (r >= 0 && s->msg_callback)
2803 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2804 buffer, 3 + payload + padding,
2805 s, s->msg_callback_arg);
2807 OPENSSL_free(buffer);
2812 else if (hbtype == TLS1_HB_RESPONSE)
2816 /* We only send sequence numbers (2 bytes unsigned int),
2817 * and 16 random bytes, so we just try to read the
2818 * sequence number */
2821 if (payload == 18 && seq == s->tlsext_hb_seq)
2824 s->tlsext_hb_pending = 0;
2832 tls1_heartbeat(SSL *s)
2834 unsigned char *buf, *p;
2836 unsigned int payload = 18; /* Sequence number + random bytes */
2837 unsigned int padding = 16; /* Use minimum padding */
2839 /* Only send if peer supports and accepts HB requests... */
2840 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
2841 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
2843 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
2847 /* ...and there is none in flight yet... */
2848 if (s->tlsext_hb_pending)
2850 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
2854 /* ...and no handshake in progress. */
2855 if (SSL_in_init(s) || s->in_handshake)
2857 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
2861 /* Check if padding is too long, payload and padding
2862 * must not exceed 2^14 - 3 = 16381 bytes in total.
2864 OPENSSL_assert(payload + padding <= 16381);
2866 /* Create HeartBeat message, we just use a sequence number
2867 * as payload to distuingish different messages and add
2868 * some random stuff.
2869 * - Message Type, 1 byte
2870 * - Payload Length, 2 bytes (unsigned int)
2871 * - Payload, the sequence number (2 bytes uint)
2872 * - Payload, random bytes (16 bytes uint)
2875 buf = OPENSSL_malloc(1 + 2 + payload + padding);
2878 *p++ = TLS1_HB_REQUEST;
2879 /* Payload length (18 bytes here) */
2881 /* Sequence number */
2882 s2n(s->tlsext_hb_seq, p);
2883 /* 16 random bytes */
2884 RAND_pseudo_bytes(p, 16);
2886 /* Random padding */
2887 RAND_pseudo_bytes(p, padding);
2889 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
2892 if (s->msg_callback)
2893 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2894 buf, 3 + payload + padding,
2895 s, s->msg_callback_arg);
2897 s->tlsext_hb_pending = 1;