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])
543 /* Check cert parameters compatible with extensions: currently just checks
544 * EC certificates have compatible curves and compression.
546 static int tls1_check_cert_param(SSL *s, X509 *x)
548 unsigned char comp_id, curve_id[2];
551 pkey = X509_get_pubkey(x);
554 /* If not EC nothing to do */
555 if (pkey->type != EVP_PKEY_EC)
560 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
564 return tls1_check_ec_key(s, curve_id, &comp_id);
566 /* Check EC temporary key is compatible with client extensions */
567 int tls1_check_ec_tmp_key(SSL *s)
569 unsigned char curve_id[2];
570 EC_KEY *ec = s->cert->ecdh_tmp;
571 if (s->cert->ecdh_tmp_auto)
573 /* Need a shared curve */
574 if (tls1_shared_curve(s, 0))
580 if (s->cert->ecdh_tmp_cb)
585 if (!tls1_set_ec_id(curve_id, NULL, ec))
587 return tls1_check_ec_key(s, curve_id, NULL);
590 #endif /* OPENSSL_NO_EC */
592 #ifndef OPENSSL_NO_TLSEXT
594 /* List of supported signature algorithms and hashes. Should make this
595 * customisable at some point, for now include everything we support.
598 #ifdef OPENSSL_NO_RSA
599 #define tlsext_sigalg_rsa(md) /* */
601 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
604 #ifdef OPENSSL_NO_DSA
605 #define tlsext_sigalg_dsa(md) /* */
607 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
610 #ifdef OPENSSL_NO_ECDSA
611 #define tlsext_sigalg_ecdsa(md) /* */
613 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
616 #define tlsext_sigalg(md) \
617 tlsext_sigalg_rsa(md) \
618 tlsext_sigalg_dsa(md) \
619 tlsext_sigalg_ecdsa(md)
621 static unsigned char tls12_sigalgs[] = {
622 #ifndef OPENSSL_NO_SHA512
623 tlsext_sigalg(TLSEXT_hash_sha512)
624 tlsext_sigalg(TLSEXT_hash_sha384)
626 #ifndef OPENSSL_NO_SHA256
627 tlsext_sigalg(TLSEXT_hash_sha256)
628 tlsext_sigalg(TLSEXT_hash_sha224)
630 #ifndef OPENSSL_NO_SHA
631 tlsext_sigalg(TLSEXT_hash_sha1)
633 #ifndef OPENSSL_NO_MD5
634 tlsext_sigalg_rsa(TLSEXT_hash_md5)
638 size_t tls12_get_sig_algs(SSL *s, unsigned char *p)
640 const unsigned char *sigs;
642 /* If server use client authentication sigalgs if not NULL */
643 if (s->server && s->cert->client_sigalgs)
645 sigs = s->cert->client_sigalgs;
646 sigslen = s->cert->client_sigalgslen;
648 else if (s->cert->conf_sigalgs)
650 sigs = s->cert->conf_sigalgs;
651 sigslen = s->cert->conf_sigalgslen;
655 sigs = tls12_sigalgs;
656 sigslen = sizeof(tls12_sigalgs);
658 /* If FIPS mode don't include MD5 which is last */
665 memcpy(p, sigs, sigslen);
669 /* byte_compare is a compare function for qsort(3) that compares bytes. */
670 static int byte_compare(const void *in_a, const void *in_b)
672 unsigned char a = *((const unsigned char*) in_a);
673 unsigned char b = *((const unsigned char*) in_b);
682 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
685 unsigned char *ret = p;
686 #ifndef OPENSSL_NO_EC
687 /* See if we support any ECC ciphersuites */
689 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
692 unsigned long alg_k, alg_a;
693 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
695 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
697 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
699 alg_k = c->algorithm_mkey;
700 alg_a = c->algorithm_auth;
701 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
702 || (alg_a & SSL_aECDSA)))
711 /* don't add extensions for SSLv3 unless doing secure renegotiation */
712 if (s->client_version == SSL3_VERSION
713 && !s->s3->send_connection_binding)
718 if (ret>=limit) return NULL; /* this really never occurs, but ... */
720 if (s->tlsext_hostname != NULL)
722 /* Add TLS extension servername to the Client Hello message */
723 unsigned long size_str;
726 /* check for enough space.
727 4 for the servername type and entension length
728 2 for servernamelist length
729 1 for the hostname type
730 2 for hostname length
734 if ((lenmax = limit - ret - 9) < 0
735 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
738 /* extension type and length */
739 s2n(TLSEXT_TYPE_server_name,ret);
742 /* length of servername list */
745 /* hostname type, length and hostname */
746 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
748 memcpy(ret, s->tlsext_hostname, size_str);
752 /* Add RI if renegotiating */
757 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
759 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
763 if((limit - p - 4 - el) < 0) return NULL;
765 s2n(TLSEXT_TYPE_renegotiate,ret);
768 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
770 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
777 #ifndef OPENSSL_NO_SRP
778 /* Add SRP username if there is one */
779 if (s->srp_ctx.login != NULL)
780 { /* Add TLS extension SRP username to the Client Hello message */
782 int login_len = strlen(s->srp_ctx.login);
783 if (login_len > 255 || login_len == 0)
785 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
789 /* check for enough space.
790 4 for the srp type type and entension length
791 1 for the srp user identity
792 + srp user identity length
794 if ((limit - ret - 5 - login_len) < 0) return NULL;
796 /* fill in the extension */
797 s2n(TLSEXT_TYPE_srp,ret);
798 s2n(login_len+1,ret);
799 (*ret++) = (unsigned char) login_len;
800 memcpy(ret, s->srp_ctx.login, login_len);
805 #ifndef OPENSSL_NO_EC
808 /* Add TLS extension ECPointFormats to the ClientHello message */
810 const unsigned char *plist;
812 /* If we have a custom point format list use it otherwise
814 plist = s->tlsext_ecpointformatlist;
816 plistlen = s->tlsext_ecpointformatlist_length;
819 plist = ecformats_default;
820 plistlen = sizeof(ecformats_default);
823 if ((lenmax = limit - ret - 5) < 0) return NULL;
824 if (plistlen > (size_t)lenmax) return NULL;
827 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
831 s2n(TLSEXT_TYPE_ec_point_formats,ret);
832 s2n(plistlen + 1,ret);
833 *(ret++) = (unsigned char)plistlen ;
834 memcpy(ret, plist, plistlen);
837 /* Add TLS extension EllipticCurves to the ClientHello message */
838 plist = s->tlsext_ellipticcurvelist;
839 tls1_get_curvelist(s, 0, &plist, &plistlen);
841 if ((lenmax = limit - ret - 6) < 0) return NULL;
842 if (plistlen > (size_t)lenmax) return NULL;
843 if (plistlen > 65532)
845 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
849 s2n(TLSEXT_TYPE_elliptic_curves,ret);
850 s2n(plistlen + 2, ret);
852 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
853 * elliptic_curve_list, but the examples use two bytes.
854 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
855 * resolves this to two bytes.
858 memcpy(ret, plist, plistlen);
861 #endif /* OPENSSL_NO_EC */
863 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
866 if (!s->new_session && s->session && s->session->tlsext_tick)
867 ticklen = s->session->tlsext_ticklen;
868 else if (s->session && s->tlsext_session_ticket &&
869 s->tlsext_session_ticket->data)
871 ticklen = s->tlsext_session_ticket->length;
872 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
873 if (!s->session->tlsext_tick)
875 memcpy(s->session->tlsext_tick,
876 s->tlsext_session_ticket->data,
878 s->session->tlsext_ticklen = ticklen;
882 if (ticklen == 0 && s->tlsext_session_ticket &&
883 s->tlsext_session_ticket->data == NULL)
885 /* Check for enough room 2 for extension type, 2 for len
888 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
889 s2n(TLSEXT_TYPE_session_ticket,ret);
893 memcpy(ret, s->session->tlsext_tick, ticklen);
899 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
902 salglen = tls12_get_sig_algs(s, NULL);
903 if ((size_t)(limit - ret) < salglen + 6)
905 s2n(TLSEXT_TYPE_signature_algorithms,ret);
906 s2n(salglen + 2, ret);
908 tls12_get_sig_algs(s, ret);
912 #ifdef TLSEXT_TYPE_opaque_prf_input
913 if (s->s3->client_opaque_prf_input != NULL &&
914 s->version != DTLS1_VERSION)
916 size_t col = s->s3->client_opaque_prf_input_len;
918 if ((long)(limit - ret - 6 - col < 0))
920 if (col > 0xFFFD) /* can't happen */
923 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
926 memcpy(ret, s->s3->client_opaque_prf_input, col);
931 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
932 s->version != DTLS1_VERSION)
935 long extlen, idlen, itmp;
939 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
941 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
942 itmp = i2d_OCSP_RESPID(id, NULL);
948 if (s->tlsext_ocsp_exts)
950 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
957 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
958 s2n(TLSEXT_TYPE_status_request, ret);
959 if (extlen + idlen > 0xFFF0)
961 s2n(extlen + idlen + 5, ret);
962 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
964 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
966 /* save position of id len */
967 unsigned char *q = ret;
968 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
969 /* skip over id len */
971 itmp = i2d_OCSP_RESPID(id, &ret);
977 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
980 #ifndef OPENSSL_NO_HEARTBEATS
981 /* Add Heartbeat extension */
982 s2n(TLSEXT_TYPE_heartbeat,ret);
985 * 1: peer may send requests
986 * 2: peer not allowed to send requests
988 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
989 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
991 *(ret++) = SSL_TLSEXT_HB_ENABLED;
994 #ifndef OPENSSL_NO_NEXTPROTONEG
995 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
997 /* The client advertises an emtpy extension to indicate its
998 * support for Next Protocol Negotiation */
999 if (limit - ret - 4 < 0)
1001 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1006 if(SSL_get_srtp_profiles(s))
1010 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1012 if((limit - p - 4 - el) < 0) return NULL;
1014 s2n(TLSEXT_TYPE_use_srtp,ret);
1017 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1019 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1025 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1026 /* 2 bytes for extension type */
1027 /* 2 bytes for extension length */
1028 /* 1 byte for the list length */
1029 /* 1 byte for the list (we only support audit proofs) */
1030 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1033 const unsigned short ext_len = 2;
1034 const unsigned char list_len = 1;
1036 if ((lenmax = limit - ret - 6) < 0) return NULL;
1038 s2n(TLSEXT_TYPE_server_authz, ret);
1039 /* Extension length: 2 bytes */
1041 *(ret++) = list_len;
1042 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1045 if ((extdatalen = ret-p-2) == 0)
1052 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1055 unsigned char *ret = p;
1056 #ifndef OPENSSL_NO_NEXTPROTONEG
1057 int next_proto_neg_seen;
1060 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1061 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1065 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1067 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1069 if ((long)(limit - ret - 4) < 0) return NULL;
1071 s2n(TLSEXT_TYPE_server_name,ret);
1075 if(s->s3->send_connection_binding)
1079 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1081 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1085 if((limit - p - 4 - el) < 0) return NULL;
1087 s2n(TLSEXT_TYPE_renegotiate,ret);
1090 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1092 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1099 #ifndef OPENSSL_NO_EC
1100 if (s->tlsext_ecpointformatlist != NULL &&
1101 s->version != DTLS1_VERSION)
1103 /* Add TLS extension ECPointFormats to the ServerHello message */
1106 if ((lenmax = limit - ret - 5) < 0) return NULL;
1107 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1108 if (s->tlsext_ecpointformatlist_length > 255)
1110 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1114 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1115 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1116 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1117 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1118 ret+=s->tlsext_ecpointformatlist_length;
1121 /* Currently the server should not respond with a SupportedCurves extension */
1122 #endif /* OPENSSL_NO_EC */
1124 if (s->tlsext_ticket_expected
1125 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1127 if ((long)(limit - ret - 4) < 0) return NULL;
1128 s2n(TLSEXT_TYPE_session_ticket,ret);
1132 if (s->tlsext_status_expected)
1134 if ((long)(limit - ret - 4) < 0) return NULL;
1135 s2n(TLSEXT_TYPE_status_request,ret);
1139 #ifdef TLSEXT_TYPE_opaque_prf_input
1140 if (s->s3->server_opaque_prf_input != NULL &&
1141 s->version != DTLS1_VERSION)
1143 size_t sol = s->s3->server_opaque_prf_input_len;
1145 if ((long)(limit - ret - 6 - sol) < 0)
1147 if (sol > 0xFFFD) /* can't happen */
1150 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1153 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1162 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1164 if((limit - p - 4 - el) < 0) return NULL;
1166 s2n(TLSEXT_TYPE_use_srtp,ret);
1169 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1171 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1177 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1178 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1179 { const unsigned char cryptopro_ext[36] = {
1180 0xfd, 0xe8, /*65000*/
1181 0x00, 0x20, /*32 bytes length*/
1182 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1183 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1184 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1185 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1186 if (limit-ret<36) return NULL;
1187 memcpy(ret,cryptopro_ext,36);
1192 #ifndef OPENSSL_NO_HEARTBEATS
1193 /* Add Heartbeat extension if we've received one */
1194 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1196 s2n(TLSEXT_TYPE_heartbeat,ret);
1199 * 1: peer may send requests
1200 * 2: peer not allowed to send requests
1202 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1203 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1205 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1210 #ifndef OPENSSL_NO_NEXTPROTONEG
1211 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1212 s->s3->next_proto_neg_seen = 0;
1213 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1215 const unsigned char *npa;
1216 unsigned int npalen;
1219 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1220 if (r == SSL_TLSEXT_ERR_OK)
1222 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1223 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1225 memcpy(ret, npa, npalen);
1227 s->s3->next_proto_neg_seen = 1;
1232 /* If the client supports authz then see whether we have any to offer
1234 if (s->s3->tlsext_authz_client_types_len)
1236 size_t authz_length;
1237 /* By now we already know the new cipher, so we can look ahead
1238 * to see whether the cert we are going to send
1239 * has any authz data attached to it. */
1240 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1241 const unsigned char* const orig_authz = authz;
1243 unsigned authz_count = 0;
1245 /* The authz data contains a number of the following structures:
1246 * uint8_t authz_type
1248 * uint8_t data[length]
1250 * First we walk over it to find the number of authz elements. */
1251 for (i = 0; i < authz_length; i++)
1253 unsigned short length;
1257 if (memchr(s->s3->tlsext_authz_client_types,
1259 s->s3->tlsext_authz_client_types_len) != NULL)
1263 /* n2s increments authz by 2 */
1271 /* Add TLS extension server_authz to the ServerHello message
1272 * 2 bytes for extension type
1273 * 2 bytes for extension length
1274 * 1 byte for the list length
1275 * n bytes for the list */
1276 const unsigned short ext_len = 1 + authz_count;
1278 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1279 s2n(TLSEXT_TYPE_server_authz, ret);
1281 *(ret++) = authz_count;
1282 s->s3->tlsext_authz_promised_to_client = 1;
1286 for (i = 0; i < authz_length; i++)
1288 unsigned short length;
1293 if (memchr(s->s3->tlsext_authz_client_types,
1295 s->s3->tlsext_authz_client_types_len) != NULL)
1298 /* n2s increments authz by 2 */
1305 if ((extdatalen = ret-p-2)== 0)
1312 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1314 unsigned short type;
1315 unsigned short size;
1317 unsigned char *data = *p;
1318 int renegotiate_seen = 0;
1320 s->servername_done = 0;
1321 s->tlsext_status_type = -1;
1322 #ifndef OPENSSL_NO_NEXTPROTONEG
1323 s->s3->next_proto_neg_seen = 0;
1326 #ifndef OPENSSL_NO_HEARTBEATS
1327 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1328 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1330 /* Clear any signature algorithms extension received */
1331 if (s->cert->peer_sigalgs)
1333 OPENSSL_free(s->cert->peer_sigalgs);
1334 s->cert->peer_sigalgs = NULL;
1336 /* Clear any shared sigtnature algorithms */
1337 if (s->cert->shared_sigalgs)
1339 OPENSSL_free(s->cert->shared_sigalgs);
1340 s->cert->shared_sigalgs = NULL;
1343 if (data >= (d+n-2))
1347 if (data > (d+n-len))
1350 while (data <= (d+n-4))
1355 if (data+size > (d+n))
1358 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1360 if (s->tlsext_debug_cb)
1361 s->tlsext_debug_cb(s, 0, type, data, size,
1362 s->tlsext_debug_arg);
1363 /* The servername extension is treated as follows:
1365 - Only the hostname type is supported with a maximum length of 255.
1366 - The servername is rejected if too long or if it contains zeros,
1367 in which case an fatal alert is generated.
1368 - The servername field is maintained together with the session cache.
1369 - When a session is resumed, the servername call back invoked in order
1370 to allow the application to position itself to the right context.
1371 - The servername is acknowledged if it is new for a session or when
1372 it is identical to a previously used for the same session.
1373 Applications can control the behaviour. They can at any time
1374 set a 'desirable' servername for a new SSL object. This can be the
1375 case for example with HTTPS when a Host: header field is received and
1376 a renegotiation is requested. In this case, a possible servername
1377 presented in the new client hello is only acknowledged if it matches
1378 the value of the Host: field.
1379 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1380 if they provide for changing an explicit servername context for the session,
1381 i.e. when the session has been established with a servername extension.
1382 - On session reconnect, the servername extension may be absent.
1386 if (type == TLSEXT_TYPE_server_name)
1388 unsigned char *sdata;
1394 *al = SSL_AD_DECODE_ERROR;
1401 *al = SSL_AD_DECODE_ERROR;
1408 servname_type = *(sdata++);
1414 *al = SSL_AD_DECODE_ERROR;
1417 if (s->servername_done == 0)
1418 switch (servname_type)
1420 case TLSEXT_NAMETYPE_host_name:
1423 if(s->session->tlsext_hostname)
1425 *al = SSL_AD_DECODE_ERROR;
1428 if (len > TLSEXT_MAXLEN_host_name)
1430 *al = TLS1_AD_UNRECOGNIZED_NAME;
1433 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1435 *al = TLS1_AD_INTERNAL_ERROR;
1438 memcpy(s->session->tlsext_hostname, sdata, len);
1439 s->session->tlsext_hostname[len]='\0';
1440 if (strlen(s->session->tlsext_hostname) != len) {
1441 OPENSSL_free(s->session->tlsext_hostname);
1442 s->session->tlsext_hostname = NULL;
1443 *al = TLS1_AD_UNRECOGNIZED_NAME;
1446 s->servername_done = 1;
1450 s->servername_done = s->session->tlsext_hostname
1451 && strlen(s->session->tlsext_hostname) == len
1452 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1464 *al = SSL_AD_DECODE_ERROR;
1469 #ifndef OPENSSL_NO_SRP
1470 else if (type == TLSEXT_TYPE_srp)
1472 if (size <= 0 || ((len = data[0])) != (size -1))
1474 *al = SSL_AD_DECODE_ERROR;
1477 if (s->srp_ctx.login != NULL)
1479 *al = SSL_AD_DECODE_ERROR;
1482 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1484 memcpy(s->srp_ctx.login, &data[1], len);
1485 s->srp_ctx.login[len]='\0';
1487 if (strlen(s->srp_ctx.login) != len)
1489 *al = SSL_AD_DECODE_ERROR;
1495 #ifndef OPENSSL_NO_EC
1496 else if (type == TLSEXT_TYPE_ec_point_formats &&
1497 s->version != DTLS1_VERSION)
1499 unsigned char *sdata = data;
1500 int ecpointformatlist_length = *(sdata++);
1502 if (ecpointformatlist_length != size - 1)
1504 *al = TLS1_AD_DECODE_ERROR;
1509 if(s->session->tlsext_ecpointformatlist)
1511 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1512 s->session->tlsext_ecpointformatlist = NULL;
1514 s->session->tlsext_ecpointformatlist_length = 0;
1515 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1517 *al = TLS1_AD_INTERNAL_ERROR;
1520 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1521 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1524 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1525 sdata = s->session->tlsext_ecpointformatlist;
1526 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1527 fprintf(stderr,"%i ",*(sdata++));
1528 fprintf(stderr,"\n");
1531 else if (type == TLSEXT_TYPE_elliptic_curves &&
1532 s->version != DTLS1_VERSION)
1534 unsigned char *sdata = data;
1535 int ellipticcurvelist_length = (*(sdata++) << 8);
1536 ellipticcurvelist_length += (*(sdata++));
1538 if (ellipticcurvelist_length != size - 2)
1540 *al = TLS1_AD_DECODE_ERROR;
1545 if(s->session->tlsext_ellipticcurvelist)
1547 *al = TLS1_AD_DECODE_ERROR;
1550 s->session->tlsext_ellipticcurvelist_length = 0;
1551 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1553 *al = TLS1_AD_INTERNAL_ERROR;
1556 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1557 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1560 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1561 sdata = s->session->tlsext_ellipticcurvelist;
1562 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1563 fprintf(stderr,"%i ",*(sdata++));
1564 fprintf(stderr,"\n");
1567 #endif /* OPENSSL_NO_EC */
1568 #ifdef TLSEXT_TYPE_opaque_prf_input
1569 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1570 s->version != DTLS1_VERSION)
1572 unsigned char *sdata = data;
1576 *al = SSL_AD_DECODE_ERROR;
1579 n2s(sdata, s->s3->client_opaque_prf_input_len);
1580 if (s->s3->client_opaque_prf_input_len != size - 2)
1582 *al = SSL_AD_DECODE_ERROR;
1586 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1587 OPENSSL_free(s->s3->client_opaque_prf_input);
1588 if (s->s3->client_opaque_prf_input_len == 0)
1589 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1591 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1592 if (s->s3->client_opaque_prf_input == NULL)
1594 *al = TLS1_AD_INTERNAL_ERROR;
1599 else if (type == TLSEXT_TYPE_session_ticket)
1601 if (s->tls_session_ticket_ext_cb &&
1602 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1604 *al = TLS1_AD_INTERNAL_ERROR;
1608 else if (type == TLSEXT_TYPE_renegotiate)
1610 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1612 renegotiate_seen = 1;
1614 else if (type == TLSEXT_TYPE_signature_algorithms)
1617 if (s->cert->peer_sigalgs || size < 2)
1619 *al = SSL_AD_DECODE_ERROR;
1624 if (dsize != size || dsize & 1 || !dsize)
1626 *al = SSL_AD_DECODE_ERROR;
1629 if (!tls1_process_sigalgs(s, data, dsize))
1631 *al = SSL_AD_DECODE_ERROR;
1634 /* If sigalgs received and no shared algorithms fatal
1637 if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
1639 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1640 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
1641 *al = SSL_AD_ILLEGAL_PARAMETER;
1645 else if (type == TLSEXT_TYPE_status_request &&
1646 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1651 *al = SSL_AD_DECODE_ERROR;
1655 s->tlsext_status_type = *data++;
1657 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1659 const unsigned char *sdata;
1661 /* Read in responder_id_list */
1666 *al = SSL_AD_DECODE_ERROR;
1675 *al = SSL_AD_DECODE_ERROR;
1679 dsize -= 2 + idsize;
1683 *al = SSL_AD_DECODE_ERROR;
1688 id = d2i_OCSP_RESPID(NULL,
1692 *al = SSL_AD_DECODE_ERROR;
1697 OCSP_RESPID_free(id);
1698 *al = SSL_AD_DECODE_ERROR;
1701 if (!s->tlsext_ocsp_ids
1702 && !(s->tlsext_ocsp_ids =
1703 sk_OCSP_RESPID_new_null()))
1705 OCSP_RESPID_free(id);
1706 *al = SSL_AD_INTERNAL_ERROR;
1709 if (!sk_OCSP_RESPID_push(
1710 s->tlsext_ocsp_ids, id))
1712 OCSP_RESPID_free(id);
1713 *al = SSL_AD_INTERNAL_ERROR;
1718 /* Read in request_extensions */
1721 *al = SSL_AD_DECODE_ERROR;
1728 *al = SSL_AD_DECODE_ERROR;
1734 if (s->tlsext_ocsp_exts)
1736 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1737 X509_EXTENSION_free);
1740 s->tlsext_ocsp_exts =
1741 d2i_X509_EXTENSIONS(NULL,
1743 if (!s->tlsext_ocsp_exts
1744 || (data + dsize != sdata))
1746 *al = SSL_AD_DECODE_ERROR;
1751 /* We don't know what to do with any other type
1755 s->tlsext_status_type = -1;
1757 #ifndef OPENSSL_NO_HEARTBEATS
1758 else if (type == TLSEXT_TYPE_heartbeat)
1762 case 0x01: /* Client allows us to send HB requests */
1763 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1765 case 0x02: /* Client doesn't accept HB requests */
1766 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1767 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1769 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1774 #ifndef OPENSSL_NO_NEXTPROTONEG
1775 else if (type == TLSEXT_TYPE_next_proto_neg &&
1776 s->s3->tmp.finish_md_len == 0)
1778 /* We shouldn't accept this extension on a
1781 * s->new_session will be set on renegotiation, but we
1782 * probably shouldn't rely that it couldn't be set on
1783 * the initial renegotation too in certain cases (when
1784 * there's some other reason to disallow resuming an
1785 * earlier session -- the current code won't be doing
1786 * anything like that, but this might change).
1788 * A valid sign that there's been a previous handshake
1789 * in this connection is if s->s3->tmp.finish_md_len >
1790 * 0. (We are talking about a check that will happen
1791 * in the Hello protocol round, well before a new
1792 * Finished message could have been computed.) */
1793 s->s3->next_proto_neg_seen = 1;
1797 /* session ticket processed earlier */
1798 else if (type == TLSEXT_TYPE_use_srtp)
1800 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1805 else if (type == TLSEXT_TYPE_server_authz)
1807 unsigned char *sdata = data;
1808 unsigned char server_authz_dataformatlist_length;
1812 *al = TLS1_AD_DECODE_ERROR;
1816 server_authz_dataformatlist_length = *(sdata++);
1818 if (server_authz_dataformatlist_length != size - 1)
1820 *al = TLS1_AD_DECODE_ERROR;
1824 /* Successful session resumption uses the same authz
1825 * information as the original session so we ignore this
1826 * in the case of a session resumption. */
1830 if (s->s3->tlsext_authz_client_types != NULL)
1831 OPENSSL_free(s->s3->tlsext_authz_client_types);
1832 s->s3->tlsext_authz_client_types =
1833 OPENSSL_malloc(server_authz_dataformatlist_length);
1834 if (!s->s3->tlsext_authz_client_types)
1836 *al = TLS1_AD_INTERNAL_ERROR;
1840 s->s3->tlsext_authz_client_types_len =
1841 server_authz_dataformatlist_length;
1842 memcpy(s->s3->tlsext_authz_client_types,
1844 server_authz_dataformatlist_length);
1846 /* Sort the types in order to check for duplicates. */
1847 qsort(s->s3->tlsext_authz_client_types,
1848 server_authz_dataformatlist_length,
1849 1 /* element size */,
1852 for (i = 0; i < server_authz_dataformatlist_length; i++)
1855 s->s3->tlsext_authz_client_types[i] ==
1856 s->s3->tlsext_authz_client_types[i-1])
1858 *al = TLS1_AD_DECODE_ERROR;
1872 /* Need RI if renegotiating */
1874 if (!renegotiate_seen && s->renegotiate &&
1875 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1877 *al = SSL_AD_HANDSHAKE_FAILURE;
1878 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1879 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1882 /* If no signature algorithms extension set default values */
1883 if (!s->cert->peer_sigalgs)
1884 ssl_cert_set_default_md(s->cert);
1889 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1892 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1894 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1898 if (ssl_check_clienthello_tlsext(s) <= 0)
1900 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1906 #ifndef OPENSSL_NO_NEXTPROTONEG
1907 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1908 * elements of zero length are allowed and the set of elements must exactly fill
1909 * the length of the block. */
1910 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1912 unsigned int off = 0;
1926 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1928 unsigned short length;
1929 unsigned short type;
1930 unsigned short size;
1931 unsigned char *data = *p;
1932 int tlsext_servername = 0;
1933 int renegotiate_seen = 0;
1935 #ifndef OPENSSL_NO_NEXTPROTONEG
1936 s->s3->next_proto_neg_seen = 0;
1939 #ifndef OPENSSL_NO_HEARTBEATS
1940 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1941 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1944 if (data >= (d+n-2))
1948 if (data+length != d+n)
1950 *al = SSL_AD_DECODE_ERROR;
1954 while(data <= (d+n-4))
1959 if (data+size > (d+n))
1962 if (s->tlsext_debug_cb)
1963 s->tlsext_debug_cb(s, 1, type, data, size,
1964 s->tlsext_debug_arg);
1966 if (type == TLSEXT_TYPE_server_name)
1968 if (s->tlsext_hostname == NULL || size > 0)
1970 *al = TLS1_AD_UNRECOGNIZED_NAME;
1973 tlsext_servername = 1;
1976 #ifndef OPENSSL_NO_EC
1977 else if (type == TLSEXT_TYPE_ec_point_formats &&
1978 s->version != DTLS1_VERSION)
1980 unsigned char *sdata = data;
1981 int ecpointformatlist_length = *(sdata++);
1983 if (ecpointformatlist_length != size - 1)
1985 *al = TLS1_AD_DECODE_ERROR;
1988 s->session->tlsext_ecpointformatlist_length = 0;
1989 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1990 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1992 *al = TLS1_AD_INTERNAL_ERROR;
1995 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1996 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1998 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1999 sdata = s->session->tlsext_ecpointformatlist;
2000 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2001 fprintf(stderr,"%i ",*(sdata++));
2002 fprintf(stderr,"\n");
2005 #endif /* OPENSSL_NO_EC */
2007 else if (type == TLSEXT_TYPE_session_ticket)
2009 if (s->tls_session_ticket_ext_cb &&
2010 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2012 *al = TLS1_AD_INTERNAL_ERROR;
2015 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2018 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2021 s->tlsext_ticket_expected = 1;
2023 #ifdef TLSEXT_TYPE_opaque_prf_input
2024 else if (type == TLSEXT_TYPE_opaque_prf_input &&
2025 s->version != DTLS1_VERSION)
2027 unsigned char *sdata = data;
2031 *al = SSL_AD_DECODE_ERROR;
2034 n2s(sdata, s->s3->server_opaque_prf_input_len);
2035 if (s->s3->server_opaque_prf_input_len != size - 2)
2037 *al = SSL_AD_DECODE_ERROR;
2041 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2042 OPENSSL_free(s->s3->server_opaque_prf_input);
2043 if (s->s3->server_opaque_prf_input_len == 0)
2044 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2046 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2048 if (s->s3->server_opaque_prf_input == NULL)
2050 *al = TLS1_AD_INTERNAL_ERROR;
2055 else if (type == TLSEXT_TYPE_status_request &&
2056 s->version != DTLS1_VERSION)
2058 /* MUST be empty and only sent if we've requested
2059 * a status request message.
2061 if ((s->tlsext_status_type == -1) || (size > 0))
2063 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2066 /* Set flag to expect CertificateStatus message */
2067 s->tlsext_status_expected = 1;
2069 #ifndef OPENSSL_NO_NEXTPROTONEG
2070 else if (type == TLSEXT_TYPE_next_proto_neg &&
2071 s->s3->tmp.finish_md_len == 0)
2073 unsigned char *selected;
2074 unsigned char selected_len;
2076 /* We must have requested it. */
2077 if ((s->ctx->next_proto_select_cb == NULL))
2079 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2082 /* The data must be valid */
2083 if (!ssl_next_proto_validate(data, size))
2085 *al = TLS1_AD_DECODE_ERROR;
2088 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2090 *al = TLS1_AD_INTERNAL_ERROR;
2093 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2094 if (!s->next_proto_negotiated)
2096 *al = TLS1_AD_INTERNAL_ERROR;
2099 memcpy(s->next_proto_negotiated, selected, selected_len);
2100 s->next_proto_negotiated_len = selected_len;
2101 s->s3->next_proto_neg_seen = 1;
2104 else if (type == TLSEXT_TYPE_renegotiate)
2106 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2108 renegotiate_seen = 1;
2110 #ifndef OPENSSL_NO_HEARTBEATS
2111 else if (type == TLSEXT_TYPE_heartbeat)
2115 case 0x01: /* Server allows us to send HB requests */
2116 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2118 case 0x02: /* Server doesn't accept HB requests */
2119 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2120 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2122 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2127 else if (type == TLSEXT_TYPE_use_srtp)
2129 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2134 else if (type == TLSEXT_TYPE_server_authz)
2136 /* We only support audit proofs. It's an error to send
2137 * an authz hello extension if the client
2138 * didn't request a proof. */
2139 unsigned char *sdata = data;
2140 unsigned char server_authz_dataformatlist_length;
2142 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2144 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2150 *al = TLS1_AD_DECODE_ERROR;
2154 server_authz_dataformatlist_length = *(sdata++);
2155 if (server_authz_dataformatlist_length != size - 1)
2157 *al = TLS1_AD_DECODE_ERROR;
2161 /* We only support audit proofs, so a legal ServerHello
2162 * authz list contains exactly one entry. */
2163 if (server_authz_dataformatlist_length != 1 ||
2164 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2166 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2170 s->s3->tlsext_authz_server_promised = 1;
2178 *al = SSL_AD_DECODE_ERROR;
2182 if (!s->hit && tlsext_servername == 1)
2184 if (s->tlsext_hostname)
2186 if (s->session->tlsext_hostname == NULL)
2188 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2189 if (!s->session->tlsext_hostname)
2191 *al = SSL_AD_UNRECOGNIZED_NAME;
2197 *al = SSL_AD_DECODE_ERROR;
2207 /* Determine if we need to see RI. Strictly speaking if we want to
2208 * avoid an attack we should *always* see RI even on initial server
2209 * hello because the client doesn't see any renegotiation during an
2210 * attack. However this would mean we could not connect to any server
2211 * which doesn't support RI so for the immediate future tolerate RI
2212 * absence on initial connect only.
2214 if (!renegotiate_seen
2215 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2216 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2218 *al = SSL_AD_HANDSHAKE_FAILURE;
2219 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2220 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2228 int ssl_prepare_clienthello_tlsext(SSL *s)
2231 #ifdef TLSEXT_TYPE_opaque_prf_input
2235 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2237 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2242 if (s->tlsext_opaque_prf_input != NULL)
2244 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2245 OPENSSL_free(s->s3->client_opaque_prf_input);
2247 if (s->tlsext_opaque_prf_input_len == 0)
2248 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2250 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2251 if (s->s3->client_opaque_prf_input == NULL)
2253 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2256 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2260 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2261 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2268 int ssl_prepare_serverhello_tlsext(SSL *s)
2270 #ifndef OPENSSL_NO_EC
2271 /* If we are server and using an ECC cipher suite, send the point formats we support
2272 * if the client sent us an ECPointsFormat extension. Note that the server is not
2273 * supposed to send an EllipticCurves extension.
2276 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2277 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2278 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2279 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2283 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2284 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2286 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2289 s->tlsext_ecpointformatlist_length = 3;
2290 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2291 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2292 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2294 #endif /* OPENSSL_NO_EC */
2299 static int ssl_check_clienthello_tlsext(SSL *s)
2301 int ret=SSL_TLSEXT_ERR_NOACK;
2302 int al = SSL_AD_UNRECOGNIZED_NAME;
2304 #ifndef OPENSSL_NO_EC
2305 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2306 * ssl3_choose_cipher in s3_lib.c.
2308 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2309 * ssl3_choose_cipher in s3_lib.c.
2313 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2314 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2315 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2316 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2318 /* If status request then ask callback what to do.
2319 * Note: this must be called after servername callbacks in case
2320 * the certificate has changed.
2322 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2325 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2328 /* We don't want to send a status request response */
2329 case SSL_TLSEXT_ERR_NOACK:
2330 s->tlsext_status_expected = 0;
2332 /* status request response should be sent */
2333 case SSL_TLSEXT_ERR_OK:
2334 if (s->tlsext_ocsp_resp)
2335 s->tlsext_status_expected = 1;
2337 s->tlsext_status_expected = 0;
2339 /* something bad happened */
2340 case SSL_TLSEXT_ERR_ALERT_FATAL:
2341 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2342 al = SSL_AD_INTERNAL_ERROR;
2347 s->tlsext_status_expected = 0;
2349 #ifdef TLSEXT_TYPE_opaque_prf_input
2351 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2352 * but we might be sending an alert in response to the client hello,
2353 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2357 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2359 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2362 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2363 al = SSL_AD_INTERNAL_ERROR;
2368 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2369 OPENSSL_free(s->s3->server_opaque_prf_input);
2370 s->s3->server_opaque_prf_input = NULL;
2372 if (s->tlsext_opaque_prf_input != NULL)
2374 if (s->s3->client_opaque_prf_input != NULL &&
2375 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2377 /* can only use this extension if we have a server opaque PRF input
2378 * of the same length as the client opaque PRF input! */
2380 if (s->tlsext_opaque_prf_input_len == 0)
2381 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2383 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2384 if (s->s3->server_opaque_prf_input == NULL)
2386 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2387 al = SSL_AD_INTERNAL_ERROR;
2390 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2394 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2396 /* The callback wants to enforce use of the extension,
2397 * but we can't do that with the client opaque PRF input;
2398 * abort the handshake.
2400 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2401 al = SSL_AD_HANDSHAKE_FAILURE;
2409 case SSL_TLSEXT_ERR_ALERT_FATAL:
2410 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2413 case SSL_TLSEXT_ERR_ALERT_WARNING:
2414 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2417 case SSL_TLSEXT_ERR_NOACK:
2418 s->servername_done=0;
2424 int ssl_check_serverhello_tlsext(SSL *s)
2426 int ret=SSL_TLSEXT_ERR_NOACK;
2427 int al = SSL_AD_UNRECOGNIZED_NAME;
2429 #ifndef OPENSSL_NO_EC
2430 /* If we are client and using an elliptic curve cryptography cipher
2431 * suite, then if server returns an EC point formats lists extension
2432 * it must contain uncompressed.
2434 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2435 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2436 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2437 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2438 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2440 /* we are using an ECC cipher */
2442 unsigned char *list;
2443 int found_uncompressed = 0;
2444 list = s->session->tlsext_ecpointformatlist;
2445 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2447 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2449 found_uncompressed = 1;
2453 if (!found_uncompressed)
2455 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2459 ret = SSL_TLSEXT_ERR_OK;
2460 #endif /* OPENSSL_NO_EC */
2462 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2463 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2464 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2465 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2467 #ifdef TLSEXT_TYPE_opaque_prf_input
2468 if (s->s3->server_opaque_prf_input_len > 0)
2470 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2471 * So first verify that we really have a value from the server too. */
2473 if (s->s3->server_opaque_prf_input == NULL)
2475 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2476 al = SSL_AD_HANDSHAKE_FAILURE;
2479 /* Anytime the server *has* sent an opaque PRF input, we need to check
2480 * that we have a client opaque PRF input of the same size. */
2481 if (s->s3->client_opaque_prf_input == NULL ||
2482 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2484 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2485 al = SSL_AD_ILLEGAL_PARAMETER;
2490 /* If we've requested certificate status and we wont get one
2493 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2494 && s->ctx && s->ctx->tlsext_status_cb)
2497 /* Set resp to NULL, resplen to -1 so callback knows
2498 * there is no response.
2500 if (s->tlsext_ocsp_resp)
2502 OPENSSL_free(s->tlsext_ocsp_resp);
2503 s->tlsext_ocsp_resp = NULL;
2505 s->tlsext_ocsp_resplen = -1;
2506 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2509 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2510 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2514 al = SSL_AD_INTERNAL_ERROR;
2515 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2521 case SSL_TLSEXT_ERR_ALERT_FATAL:
2522 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2525 case SSL_TLSEXT_ERR_ALERT_WARNING:
2526 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2529 case SSL_TLSEXT_ERR_NOACK:
2530 s->servername_done=0;
2536 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2539 if (s->version < SSL3_VERSION)
2541 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2543 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2547 if (ssl_check_serverhello_tlsext(s) <= 0)
2549 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2555 /* Since the server cache lookup is done early on in the processing of the
2556 * ClientHello, and other operations depend on the result, we need to handle
2557 * any TLS session ticket extension at the same time.
2559 * session_id: points at the session ID in the ClientHello. This code will
2560 * read past the end of this in order to parse out the session ticket
2561 * extension, if any.
2562 * len: the length of the session ID.
2563 * limit: a pointer to the first byte after the ClientHello.
2564 * ret: (output) on return, if a ticket was decrypted, then this is set to
2565 * point to the resulting session.
2567 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2568 * ciphersuite, in which case we have no use for session tickets and one will
2569 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2572 * -1: fatal error, either from parsing or decrypting the ticket.
2573 * 0: no ticket was found (or was ignored, based on settings).
2574 * 1: a zero length extension was found, indicating that the client supports
2575 * session tickets but doesn't currently have one to offer.
2576 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2577 * couldn't be decrypted because of a non-fatal error.
2578 * 3: a ticket was successfully decrypted and *ret was set.
2581 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2582 * a new session ticket to the client because the client indicated support
2583 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2584 * a session ticket or we couldn't use the one it gave us, or if
2585 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2586 * Otherwise, s->tlsext_ticket_expected is set to 0.
2588 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2589 const unsigned char *limit, SSL_SESSION **ret)
2591 /* Point after session ID in client hello */
2592 const unsigned char *p = session_id + len;
2596 s->tlsext_ticket_expected = 0;
2598 /* If tickets disabled behave as if no ticket present
2599 * to permit stateful resumption.
2601 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2603 if ((s->version <= SSL3_VERSION) || !limit)
2607 /* Skip past DTLS cookie */
2608 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2615 /* Skip past cipher list */
2620 /* Skip past compression algorithm list */
2625 /* Now at start of extensions */
2626 if ((p + 2) >= limit)
2629 while ((p + 4) <= limit)
2631 unsigned short type, size;
2634 if (p + size > limit)
2636 if (type == TLSEXT_TYPE_session_ticket)
2641 /* The client will accept a ticket but doesn't
2642 * currently have one. */
2643 s->tlsext_ticket_expected = 1;
2646 if (s->tls_session_secret_cb)
2648 /* Indicate that the ticket couldn't be
2649 * decrypted rather than generating the session
2650 * from ticket now, trigger abbreviated
2651 * handshake based on external mechanism to
2652 * calculate the master secret later. */
2655 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2658 case 2: /* ticket couldn't be decrypted */
2659 s->tlsext_ticket_expected = 1;
2661 case 3: /* ticket was decrypted */
2663 case 4: /* ticket decrypted but need to renew */
2664 s->tlsext_ticket_expected = 1;
2666 default: /* fatal error */
2675 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2677 * etick: points to the body of the session ticket extension.
2678 * eticklen: the length of the session tickets extenion.
2679 * sess_id: points at the session ID.
2680 * sesslen: the length of the session ID.
2681 * psess: (output) on return, if a ticket was decrypted, then this is set to
2682 * point to the resulting session.
2685 * -1: fatal error, either from parsing or decrypting the ticket.
2686 * 2: the ticket couldn't be decrypted.
2687 * 3: a ticket was successfully decrypted and *psess was set.
2688 * 4: same as 3, but the ticket needs to be renewed.
2690 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2691 const unsigned char *sess_id, int sesslen,
2692 SSL_SESSION **psess)
2695 unsigned char *sdec;
2696 const unsigned char *p;
2697 int slen, mlen, renew_ticket = 0;
2698 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2701 SSL_CTX *tctx = s->initial_ctx;
2702 /* Need at least keyname + iv + some encrypted data */
2705 /* Initialize session ticket encryption and HMAC contexts */
2706 HMAC_CTX_init(&hctx);
2707 EVP_CIPHER_CTX_init(&ctx);
2708 if (tctx->tlsext_ticket_key_cb)
2710 unsigned char *nctick = (unsigned char *)etick;
2711 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2722 /* Check key name matches */
2723 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2725 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2726 tlsext_tick_md(), NULL);
2727 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2728 tctx->tlsext_tick_aes_key, etick + 16);
2730 /* Attempt to process session ticket, first conduct sanity and
2731 * integrity checks on ticket.
2733 mlen = HMAC_size(&hctx);
2736 EVP_CIPHER_CTX_cleanup(&ctx);
2740 /* Check HMAC of encrypted ticket */
2741 HMAC_Update(&hctx, etick, eticklen);
2742 HMAC_Final(&hctx, tick_hmac, NULL);
2743 HMAC_CTX_cleanup(&hctx);
2744 if (memcmp(tick_hmac, etick + eticklen, mlen))
2746 /* Attempt to decrypt session data */
2747 /* Move p after IV to start of encrypted ticket, update length */
2748 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2749 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2750 sdec = OPENSSL_malloc(eticklen);
2753 EVP_CIPHER_CTX_cleanup(&ctx);
2756 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2757 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2760 EVP_CIPHER_CTX_cleanup(&ctx);
2763 sess = d2i_SSL_SESSION(NULL, &p, slen);
2767 /* The session ID, if non-empty, is used by some clients to
2768 * detect that the ticket has been accepted. So we copy it to
2769 * the session structure. If it is empty set length to zero
2770 * as required by standard.
2773 memcpy(sess->session_id, sess_id, sesslen);
2774 sess->session_id_length = sesslen;
2782 /* For session parse failure, indicate that we need to send a new
2787 /* Tables to translate from NIDs to TLS v1.2 ids */
2795 static tls12_lookup tls12_md[] = {
2796 {NID_md5, TLSEXT_hash_md5},
2797 {NID_sha1, TLSEXT_hash_sha1},
2798 {NID_sha224, TLSEXT_hash_sha224},
2799 {NID_sha256, TLSEXT_hash_sha256},
2800 {NID_sha384, TLSEXT_hash_sha384},
2801 {NID_sha512, TLSEXT_hash_sha512}
2804 static tls12_lookup tls12_sig[] = {
2805 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2806 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2807 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2810 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2813 for (i = 0; i < tlen; i++)
2815 if (table[i].nid == nid)
2821 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2824 for (i = 0; i < tlen; i++)
2826 if ((table[i].id) == id)
2827 return table[i].nid;
2832 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2837 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2838 sizeof(tls12_md)/sizeof(tls12_lookup));
2841 sig_id = tls12_get_sigid(pk);
2844 p[0] = (unsigned char)md_id;
2845 p[1] = (unsigned char)sig_id;
2849 int tls12_get_sigid(const EVP_PKEY *pk)
2851 return tls12_find_id(pk->type, tls12_sig,
2852 sizeof(tls12_sig)/sizeof(tls12_lookup));
2855 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2859 #ifndef OPENSSL_NO_MD5
2860 case TLSEXT_hash_md5:
2867 #ifndef OPENSSL_NO_SHA
2868 case TLSEXT_hash_sha1:
2871 #ifndef OPENSSL_NO_SHA256
2872 case TLSEXT_hash_sha224:
2873 return EVP_sha224();
2875 case TLSEXT_hash_sha256:
2876 return EVP_sha256();
2878 #ifndef OPENSSL_NO_SHA512
2879 case TLSEXT_hash_sha384:
2880 return EVP_sha384();
2882 case TLSEXT_hash_sha512:
2883 return EVP_sha512();
2891 static int tls12_get_pkey_idx(unsigned char sig_alg)
2895 #ifndef OPENSSL_NO_RSA
2896 case TLSEXT_signature_rsa:
2897 return SSL_PKEY_RSA_SIGN;
2899 #ifndef OPENSSL_NO_DSA
2900 case TLSEXT_signature_dsa:
2901 return SSL_PKEY_DSA_SIGN;
2903 #ifndef OPENSSL_NO_ECDSA
2904 case TLSEXT_signature_ecdsa:
2905 return SSL_PKEY_ECC;
2911 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
2912 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
2913 int *psignhash_nid, const unsigned char *data)
2915 int sign_nid, hash_nid;
2916 if (!phash_nid && !psign_nid && !psignhash_nid)
2918 if (phash_nid || psignhash_nid)
2920 hash_nid = tls12_find_nid(data[0], tls12_md,
2921 sizeof(tls12_md)/sizeof(tls12_lookup));
2923 *phash_nid = hash_nid;
2925 if (psign_nid || psignhash_nid)
2927 sign_nid = tls12_find_nid(data[1], tls12_sig,
2928 sizeof(tls12_sig)/sizeof(tls12_lookup));
2930 *psign_nid = sign_nid;
2934 if (sign_nid && hash_nid)
2935 OBJ_find_sigid_by_algs(psignhash_nid,
2936 hash_nid, sign_nid);
2938 *psignhash_nid = NID_undef;
2941 /* Given preference and allowed sigalgs set shared sigalgs */
2942 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
2943 const unsigned char *pref, size_t preflen,
2944 const unsigned char *allow, size_t allowlen)
2946 const unsigned char *ptmp, *atmp;
2947 size_t i, j, nmatch = 0;
2948 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
2950 /* Skip disabled hashes or signature algorithms */
2951 if (tls12_get_hash(ptmp[0]) == NULL)
2953 if (tls12_get_pkey_idx(ptmp[1]) == -1)
2955 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
2957 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
2962 shsig->rhash = ptmp[0];
2963 shsig->rsign = ptmp[1];
2964 tls1_lookup_sigalg(&shsig->hash_nid,
2966 &shsig->signandhash_nid,
2977 /* Set shared signature algorithms for SSL structures */
2978 static int tls1_set_shared_sigalgs(SSL *s)
2980 const unsigned char *pref, *allow, *conf;
2981 size_t preflen, allowlen, conflen;
2983 TLS_SIGALGS *salgs = NULL;
2985 /* If client use client signature algorithms if not NULL */
2986 if (!s->server && c->client_sigalgs)
2988 conf = c->client_sigalgs;
2989 conflen = c->client_sigalgslen;
2991 else if (c->conf_sigalgs)
2993 conf = c->conf_sigalgs;
2994 conflen = c->conf_sigalgslen;
2998 conf = tls12_sigalgs;
2999 conflen = sizeof(tls12_sigalgs);
3005 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
3009 allow = c->peer_sigalgs;
3010 allowlen = c->peer_sigalgslen;
3016 pref = c->peer_sigalgs;
3017 preflen = c->peer_sigalgslen;
3019 nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3022 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3025 nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3026 c->shared_sigalgs = salgs;
3027 c->shared_sigalgslen = nmatch;
3032 /* Set preferred digest for each key type */
3034 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3040 TLS_SIGALGS *sigptr;
3041 /* Extension ignored for TLS versions below 1.2 */
3042 if (TLS1_get_version(s) < TLS1_2_VERSION)
3044 /* Should never happen */
3048 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
3049 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
3050 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
3051 c->pkeys[SSL_PKEY_ECC].digest = NULL;
3053 c->peer_sigalgs = OPENSSL_malloc(dsize);
3054 if (!c->peer_sigalgs)
3056 c->peer_sigalgslen = dsize;
3057 memcpy(c->peer_sigalgs, data, dsize);
3059 tls1_set_shared_sigalgs(s);
3061 for (i = 0, sigptr = c->shared_sigalgs;
3062 i < c->shared_sigalgslen; i++, sigptr++)
3064 idx = tls12_get_pkey_idx(sigptr->rsign);
3065 if (idx > 0 && c->pkeys[idx].digest == NULL)
3067 md = tls12_get_hash(sigptr->rhash);
3068 c->pkeys[idx].digest = md;
3069 if (idx == SSL_PKEY_RSA_SIGN)
3070 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3074 /* In strict mode leave unset digests as NULL to indicate we can't
3075 * use the certificate for signing.
3077 if (!(s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT))
3079 /* Set any remaining keys to default values. NOTE: if alg is
3080 * not supported it stays as NULL.
3082 #ifndef OPENSSL_NO_DSA
3083 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3084 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3086 #ifndef OPENSSL_NO_RSA
3087 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3089 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3090 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3093 #ifndef OPENSSL_NO_ECDSA
3094 if (!c->pkeys[SSL_PKEY_ECC].digest)
3095 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3102 int SSL_get_sigalgs(SSL *s, int idx,
3103 int *psign, int *phash, int *psignhash,
3104 unsigned char *rsig, unsigned char *rhash)
3106 const unsigned char *psig = s->cert->peer_sigalgs;
3112 if (idx >= (int)s->cert->peer_sigalgslen)
3119 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3121 return s->cert->peer_sigalgslen / 2;
3124 int SSL_get_shared_sigalgs(SSL *s, int idx,
3125 int *psign, int *phash, int *psignhash,
3126 unsigned char *rsig, unsigned char *rhash)
3128 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3129 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3133 *phash = shsigalgs->hash_nid;
3135 *psign = shsigalgs->sign_nid;
3137 *psignhash = shsigalgs->signandhash_nid;
3139 *rsig = shsigalgs->rsign;
3141 *rhash = shsigalgs->rhash;
3142 return s->cert->shared_sigalgslen;
3146 #ifndef OPENSSL_NO_HEARTBEATS
3148 tls1_process_heartbeat(SSL *s)
3150 unsigned char *p = &s->s3->rrec.data[0], *pl;
3151 unsigned short hbtype;
3152 unsigned int payload;
3153 unsigned int padding = 16; /* Use minimum padding */
3155 /* Read type and payload length first */
3160 if (s->msg_callback)
3161 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3162 &s->s3->rrec.data[0], s->s3->rrec.length,
3163 s, s->msg_callback_arg);
3165 if (hbtype == TLS1_HB_REQUEST)
3167 unsigned char *buffer, *bp;
3170 /* Allocate memory for the response, size is 1 bytes
3171 * message type, plus 2 bytes payload length, plus
3172 * payload, plus padding
3174 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3177 /* Enter response type, length and copy payload */
3178 *bp++ = TLS1_HB_RESPONSE;
3180 memcpy(bp, pl, payload);
3182 /* Random padding */
3183 RAND_pseudo_bytes(bp, padding);
3185 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3187 if (r >= 0 && s->msg_callback)
3188 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3189 buffer, 3 + payload + padding,
3190 s, s->msg_callback_arg);
3192 OPENSSL_free(buffer);
3197 else if (hbtype == TLS1_HB_RESPONSE)
3201 /* We only send sequence numbers (2 bytes unsigned int),
3202 * and 16 random bytes, so we just try to read the
3203 * sequence number */
3206 if (payload == 18 && seq == s->tlsext_hb_seq)
3209 s->tlsext_hb_pending = 0;
3217 tls1_heartbeat(SSL *s)
3219 unsigned char *buf, *p;
3221 unsigned int payload = 18; /* Sequence number + random bytes */
3222 unsigned int padding = 16; /* Use minimum padding */
3224 /* Only send if peer supports and accepts HB requests... */
3225 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3226 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3228 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3232 /* ...and there is none in flight yet... */
3233 if (s->tlsext_hb_pending)
3235 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3239 /* ...and no handshake in progress. */
3240 if (SSL_in_init(s) || s->in_handshake)
3242 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3246 /* Check if padding is too long, payload and padding
3247 * must not exceed 2^14 - 3 = 16381 bytes in total.
3249 OPENSSL_assert(payload + padding <= 16381);
3251 /* Create HeartBeat message, we just use a sequence number
3252 * as payload to distuingish different messages and add
3253 * some random stuff.
3254 * - Message Type, 1 byte
3255 * - Payload Length, 2 bytes (unsigned int)
3256 * - Payload, the sequence number (2 bytes uint)
3257 * - Payload, random bytes (16 bytes uint)
3260 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3263 *p++ = TLS1_HB_REQUEST;
3264 /* Payload length (18 bytes here) */
3266 /* Sequence number */
3267 s2n(s->tlsext_hb_seq, p);
3268 /* 16 random bytes */
3269 RAND_pseudo_bytes(p, 16);
3271 /* Random padding */
3272 RAND_pseudo_bytes(p, padding);
3274 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3277 if (s->msg_callback)
3278 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3279 buf, 3 + payload + padding,
3280 s, s->msg_callback_arg);
3282 s->tlsext_hb_pending = 1;
3291 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3296 int sigalgs[MAX_SIGALGLEN];
3299 static int sig_cb(const char *elem, int len, void *arg)
3301 sig_cb_st *sarg = arg;
3304 int sig_alg, hash_alg;
3305 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3307 if (len > (int)(sizeof(etmp) - 1))
3309 memcpy(etmp, elem, len);
3311 p = strchr(etmp, '+');
3319 if (!strcmp(etmp, "RSA"))
3320 sig_alg = EVP_PKEY_RSA;
3321 else if (!strcmp(etmp, "DSA"))
3322 sig_alg = EVP_PKEY_DSA;
3323 else if (!strcmp(etmp, "ECDSA"))
3324 sig_alg = EVP_PKEY_EC;
3327 hash_alg = OBJ_sn2nid(p);
3328 if (hash_alg == NID_undef)
3329 hash_alg = OBJ_ln2nid(p);
3330 if (hash_alg == NID_undef)
3333 for (i = 0; i < sarg->sigalgcnt; i+=2)
3335 if (sarg->sigalgs[i] == sig_alg
3336 && sarg->sigalgs[i + 1] == hash_alg)
3339 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3340 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3344 /* Set suppored signature algorithms based on a colon separated list
3345 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3346 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
3350 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3352 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
3355 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
3357 unsigned char *sigalgs, *sptr;
3362 sigalgs = OPENSSL_malloc(salglen);
3363 if (sigalgs == NULL)
3365 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
3367 rhash = tls12_find_id(*psig_nids++, tls12_md,
3368 sizeof(tls12_md)/sizeof(tls12_lookup));
3369 rsign = tls12_find_id(*psig_nids++, tls12_sig,
3370 sizeof(tls12_sig)/sizeof(tls12_lookup));
3372 if (rhash == -1 || rsign == -1)
3380 if (c->client_sigalgs)
3381 OPENSSL_free(c->client_sigalgs);
3382 c->client_sigalgs = sigalgs;
3383 c->client_sigalgslen = salglen;
3387 if (c->conf_sigalgs)
3388 OPENSSL_free(c->conf_sigalgs);
3389 c->conf_sigalgs = sigalgs;
3390 c->conf_sigalgslen = salglen;
3396 OPENSSL_free(sigalgs);
3400 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
3404 if (default_nid == -1)
3406 sig_nid = X509_get_signature_nid(x);
3408 return sig_nid == default_nid ? 1 : 0;
3409 for (i = 0; i < c->shared_sigalgslen; i++)
3410 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
3415 /* Check certificate chain is consistent with TLS extensions and is
3418 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
3422 int rv = CERT_PKEY_INVALID;
3423 CERT_PKEY *cpk = NULL;
3427 cpk = c->pkeys + idx;
3429 pk = cpk->privatekey;
3431 /* If no cert or key, forget it */
3437 idx = ssl_cert_type(x, pk);
3442 /* Check all signature algorithms are consistent with
3443 * signature algorithms extension if TLS 1.2 or later
3446 if (TLS1_get_version(s) >= TLS1_2_VERSION
3447 && c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3450 unsigned char rsign = 0;
3451 if (c->peer_sigalgs)
3453 /* If no sigalgs extension use defaults from RFC5246 */
3458 case SSL_PKEY_RSA_ENC:
3459 case SSL_PKEY_RSA_SIGN:
3460 case SSL_PKEY_DH_RSA:
3461 rsign = TLSEXT_signature_rsa;
3462 default_nid = NID_sha1WithRSAEncryption;
3465 case SSL_PKEY_DSA_SIGN:
3466 case SSL_PKEY_DH_DSA:
3467 rsign = TLSEXT_signature_dsa;
3468 default_nid = NID_dsaWithSHA1;
3472 rsign = TLSEXT_signature_ecdsa;
3473 default_nid = NID_ecdsa_with_SHA1;
3481 /* If peer sent no signature algorithms extension and we
3482 * have set preferred signature algorithms check we support
3485 if (default_nid > 0 && c->conf_sigalgs)
3488 const unsigned char *p = c->conf_sigalgs;
3489 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
3491 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
3494 if (j == c->conf_sigalgslen)
3497 /* Check signature algorithm of each cert in chain */
3498 if (!tls1_check_sig_alg(c, x, default_nid))
3500 for (i = 0; i < sk_X509_num(chain); i++)
3502 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
3508 /* Check cert parameters are consistent */
3509 if (!tls1_check_cert_param(s, x))
3511 /* In strict mode check rest of chain too */
3512 if (c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3514 for (i = 0; i < sk_X509_num(chain); i++)
3516 if (!tls1_check_cert_param(s, sk_X509_value(chain, i)))
3520 rv = CERT_PKEY_VALID;
3525 if (rv && cpk->digest)
3526 rv |= CERT_PKEY_SIGN;
3527 cpk->valid_flags = rv;
3532 /* Set validity of certificates in an SSL structure */
3533 void tls1_set_cert_validity(SSL *s)
3535 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
3536 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
3537 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
3538 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
3539 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
3540 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
3542 /* User level utiity function to check a chain is suitable */
3543 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
3545 return tls1_check_chain(s, x, pk, chain, -1);