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_early(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 server key is compatible with client extensions */
567 int tls1_check_ec_server_key(SSL *s)
569 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
570 if (!cpk->x509 || !cpk->privatekey)
572 return tls1_check_cert_param(s, cpk->x509);
574 /* Check EC temporary key is compatible with client extensions */
575 int tls1_check_ec_tmp_key(SSL *s)
577 unsigned char curve_id[2];
578 EC_KEY *ec = s->cert->ecdh_tmp;
579 if (s->cert->ecdh_tmp_auto)
581 /* Need a shared curve */
582 if (tls1_shared_curve(s, 0))
588 if (s->cert->ecdh_tmp_cb)
593 if (!tls1_set_ec_id(curve_id, NULL, ec))
595 return tls1_check_ec_key(s, curve_id, NULL);
598 #endif /* OPENSSL_NO_EC */
600 #ifndef OPENSSL_NO_TLSEXT
602 /* List of supported signature algorithms and hashes. Should make this
603 * customisable at some point, for now include everything we support.
606 #ifdef OPENSSL_NO_RSA
607 #define tlsext_sigalg_rsa(md) /* */
609 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
612 #ifdef OPENSSL_NO_DSA
613 #define tlsext_sigalg_dsa(md) /* */
615 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
618 #ifdef OPENSSL_NO_ECDSA
619 #define tlsext_sigalg_ecdsa(md) /* */
621 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
624 #define tlsext_sigalg(md) \
625 tlsext_sigalg_rsa(md) \
626 tlsext_sigalg_dsa(md) \
627 tlsext_sigalg_ecdsa(md)
629 static unsigned char tls12_sigalgs[] = {
630 #ifndef OPENSSL_NO_SHA512
631 tlsext_sigalg(TLSEXT_hash_sha512)
632 tlsext_sigalg(TLSEXT_hash_sha384)
634 #ifndef OPENSSL_NO_SHA256
635 tlsext_sigalg(TLSEXT_hash_sha256)
636 tlsext_sigalg(TLSEXT_hash_sha224)
638 #ifndef OPENSSL_NO_SHA
639 tlsext_sigalg(TLSEXT_hash_sha1)
641 #ifndef OPENSSL_NO_MD5
642 tlsext_sigalg_rsa(TLSEXT_hash_md5)
646 size_t tls12_get_sig_algs(SSL *s, unsigned char *p)
648 const unsigned char *sigs;
650 sigs = s->cert->conf_sigalgs;
653 sigslen = s->cert->conf_sigalgslen;
656 sigs = tls12_sigalgs;
657 sigslen = sizeof(tls12_sigalgs);
659 /* If FIPS mode don't include MD5 which is last */
666 memcpy(p, sigs, sigslen);
670 /* byte_compare is a compare function for qsort(3) that compares bytes. */
671 static int byte_compare(const void *in_a, const void *in_b)
673 unsigned char a = *((const unsigned char*) in_a);
674 unsigned char b = *((const unsigned char*) in_b);
683 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
686 unsigned char *ret = p;
687 #ifndef OPENSSL_NO_EC
688 /* See if we support any ECC ciphersuites */
690 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
693 unsigned long alg_k, alg_a;
694 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
696 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
698 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
700 alg_k = c->algorithm_mkey;
701 alg_a = c->algorithm_auth;
702 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
703 || (alg_a & SSL_aECDSA)))
712 /* don't add extensions for SSLv3 unless doing secure renegotiation */
713 if (s->client_version == SSL3_VERSION
714 && !s->s3->send_connection_binding)
719 if (ret>=limit) return NULL; /* this really never occurs, but ... */
721 if (s->tlsext_hostname != NULL)
723 /* Add TLS extension servername to the Client Hello message */
724 unsigned long size_str;
727 /* check for enough space.
728 4 for the servername type and entension length
729 2 for servernamelist length
730 1 for the hostname type
731 2 for hostname length
735 if ((lenmax = limit - ret - 9) < 0
736 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
739 /* extension type and length */
740 s2n(TLSEXT_TYPE_server_name,ret);
743 /* length of servername list */
746 /* hostname type, length and hostname */
747 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
749 memcpy(ret, s->tlsext_hostname, size_str);
753 /* Add RI if renegotiating */
758 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
760 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
764 if((limit - p - 4 - el) < 0) return NULL;
766 s2n(TLSEXT_TYPE_renegotiate,ret);
769 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
771 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
778 #ifndef OPENSSL_NO_SRP
779 /* Add SRP username if there is one */
780 if (s->srp_ctx.login != NULL)
781 { /* Add TLS extension SRP username to the Client Hello message */
783 int login_len = strlen(s->srp_ctx.login);
784 if (login_len > 255 || login_len == 0)
786 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
790 /* check for enough space.
791 4 for the srp type type and entension length
792 1 for the srp user identity
793 + srp user identity length
795 if ((limit - ret - 5 - login_len) < 0) return NULL;
797 /* fill in the extension */
798 s2n(TLSEXT_TYPE_srp,ret);
799 s2n(login_len+1,ret);
800 (*ret++) = (unsigned char) login_len;
801 memcpy(ret, s->srp_ctx.login, login_len);
806 #ifndef OPENSSL_NO_EC
809 /* Add TLS extension ECPointFormats to the ClientHello message */
811 const unsigned char *plist;
813 /* If we have a custom point format list use it otherwise
815 plist = s->tlsext_ecpointformatlist;
817 plistlen = s->tlsext_ecpointformatlist_length;
820 plist = ecformats_default;
821 plistlen = sizeof(ecformats_default);
824 if ((lenmax = limit - ret - 5) < 0) return NULL;
825 if (plistlen > (size_t)lenmax) return NULL;
828 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
832 s2n(TLSEXT_TYPE_ec_point_formats,ret);
833 s2n(plistlen + 1,ret);
834 *(ret++) = (unsigned char)plistlen ;
835 memcpy(ret, plist, plistlen);
838 /* Add TLS extension EllipticCurves to the ClientHello message */
839 plist = s->tlsext_ellipticcurvelist;
840 tls1_get_curvelist(s, 0, &plist, &plistlen);
842 if ((lenmax = limit - ret - 6) < 0) return NULL;
843 if (plistlen > (size_t)lenmax) return NULL;
844 if (plistlen > 65532)
846 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
850 s2n(TLSEXT_TYPE_elliptic_curves,ret);
851 s2n(plistlen + 2, ret);
853 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
854 * elliptic_curve_list, but the examples use two bytes.
855 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
856 * resolves this to two bytes.
859 memcpy(ret, plist, plistlen);
862 #endif /* OPENSSL_NO_EC */
864 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
867 if (!s->new_session && s->session && s->session->tlsext_tick)
868 ticklen = s->session->tlsext_ticklen;
869 else if (s->session && s->tlsext_session_ticket &&
870 s->tlsext_session_ticket->data)
872 ticklen = s->tlsext_session_ticket->length;
873 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
874 if (!s->session->tlsext_tick)
876 memcpy(s->session->tlsext_tick,
877 s->tlsext_session_ticket->data,
879 s->session->tlsext_ticklen = ticklen;
883 if (ticklen == 0 && s->tlsext_session_ticket &&
884 s->tlsext_session_ticket->data == NULL)
886 /* Check for enough room 2 for extension type, 2 for len
889 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
890 s2n(TLSEXT_TYPE_session_ticket,ret);
894 memcpy(ret, s->session->tlsext_tick, ticklen);
900 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
903 salglen = tls12_get_sig_algs(s, NULL);
904 if ((size_t)(limit - ret) < salglen + 6)
906 s2n(TLSEXT_TYPE_signature_algorithms,ret);
907 s2n(salglen + 2, ret);
909 tls12_get_sig_algs(s, ret);
913 #ifdef TLSEXT_TYPE_opaque_prf_input
914 if (s->s3->client_opaque_prf_input != NULL &&
915 s->version != DTLS1_VERSION)
917 size_t col = s->s3->client_opaque_prf_input_len;
919 if ((long)(limit - ret - 6 - col < 0))
921 if (col > 0xFFFD) /* can't happen */
924 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
927 memcpy(ret, s->s3->client_opaque_prf_input, col);
932 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
933 s->version != DTLS1_VERSION)
936 long extlen, idlen, itmp;
940 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
942 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
943 itmp = i2d_OCSP_RESPID(id, NULL);
949 if (s->tlsext_ocsp_exts)
951 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
958 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
959 s2n(TLSEXT_TYPE_status_request, ret);
960 if (extlen + idlen > 0xFFF0)
962 s2n(extlen + idlen + 5, ret);
963 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
965 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
967 /* save position of id len */
968 unsigned char *q = ret;
969 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
970 /* skip over id len */
972 itmp = i2d_OCSP_RESPID(id, &ret);
978 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
981 #ifndef OPENSSL_NO_HEARTBEATS
982 /* Add Heartbeat extension */
983 s2n(TLSEXT_TYPE_heartbeat,ret);
986 * 1: peer may send requests
987 * 2: peer not allowed to send requests
989 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
990 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
992 *(ret++) = SSL_TLSEXT_HB_ENABLED;
995 #ifndef OPENSSL_NO_NEXTPROTONEG
996 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
998 /* The client advertises an emtpy extension to indicate its
999 * support for Next Protocol Negotiation */
1000 if (limit - ret - 4 < 0)
1002 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1007 if(SSL_get_srtp_profiles(s))
1011 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1013 if((limit - p - 4 - el) < 0) return NULL;
1015 s2n(TLSEXT_TYPE_use_srtp,ret);
1018 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1020 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1026 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1027 /* 2 bytes for extension type */
1028 /* 2 bytes for extension length */
1029 /* 1 byte for the list length */
1030 /* 1 byte for the list (we only support audit proofs) */
1031 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1034 const unsigned short ext_len = 2;
1035 const unsigned char list_len = 1;
1037 if ((lenmax = limit - ret - 6) < 0) return NULL;
1039 s2n(TLSEXT_TYPE_server_authz, ret);
1040 /* Extension length: 2 bytes */
1042 *(ret++) = list_len;
1043 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1046 if ((extdatalen = ret-p-2) == 0)
1053 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1056 unsigned char *ret = p;
1057 #ifndef OPENSSL_NO_NEXTPROTONEG
1058 int next_proto_neg_seen;
1061 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1062 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1066 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1068 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1070 if ((long)(limit - ret - 4) < 0) return NULL;
1072 s2n(TLSEXT_TYPE_server_name,ret);
1076 if(s->s3->send_connection_binding)
1080 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1082 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1086 if((limit - p - 4 - el) < 0) return NULL;
1088 s2n(TLSEXT_TYPE_renegotiate,ret);
1091 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1093 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1100 #ifndef OPENSSL_NO_EC
1101 if (s->tlsext_ecpointformatlist != NULL &&
1102 s->version != DTLS1_VERSION)
1104 /* Add TLS extension ECPointFormats to the ServerHello message */
1107 if ((lenmax = limit - ret - 5) < 0) return NULL;
1108 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1109 if (s->tlsext_ecpointformatlist_length > 255)
1111 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1115 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1116 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1117 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1118 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1119 ret+=s->tlsext_ecpointformatlist_length;
1122 /* Currently the server should not respond with a SupportedCurves extension */
1123 #endif /* OPENSSL_NO_EC */
1125 if (s->tlsext_ticket_expected
1126 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1128 if ((long)(limit - ret - 4) < 0) return NULL;
1129 s2n(TLSEXT_TYPE_session_ticket,ret);
1133 if (s->tlsext_status_expected)
1135 if ((long)(limit - ret - 4) < 0) return NULL;
1136 s2n(TLSEXT_TYPE_status_request,ret);
1140 #ifdef TLSEXT_TYPE_opaque_prf_input
1141 if (s->s3->server_opaque_prf_input != NULL &&
1142 s->version != DTLS1_VERSION)
1144 size_t sol = s->s3->server_opaque_prf_input_len;
1146 if ((long)(limit - ret - 6 - sol) < 0)
1148 if (sol > 0xFFFD) /* can't happen */
1151 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1154 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1163 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1165 if((limit - p - 4 - el) < 0) return NULL;
1167 s2n(TLSEXT_TYPE_use_srtp,ret);
1170 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1172 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1178 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1179 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1180 { const unsigned char cryptopro_ext[36] = {
1181 0xfd, 0xe8, /*65000*/
1182 0x00, 0x20, /*32 bytes length*/
1183 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1184 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1185 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1186 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1187 if (limit-ret<36) return NULL;
1188 memcpy(ret,cryptopro_ext,36);
1193 #ifndef OPENSSL_NO_HEARTBEATS
1194 /* Add Heartbeat extension if we've received one */
1195 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1197 s2n(TLSEXT_TYPE_heartbeat,ret);
1200 * 1: peer may send requests
1201 * 2: peer not allowed to send requests
1203 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1204 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1206 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1211 #ifndef OPENSSL_NO_NEXTPROTONEG
1212 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1213 s->s3->next_proto_neg_seen = 0;
1214 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1216 const unsigned char *npa;
1217 unsigned int npalen;
1220 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1221 if (r == SSL_TLSEXT_ERR_OK)
1223 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1224 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1226 memcpy(ret, npa, npalen);
1228 s->s3->next_proto_neg_seen = 1;
1233 /* If the client supports authz then see whether we have any to offer
1235 if (s->s3->tlsext_authz_client_types_len)
1237 size_t authz_length;
1238 /* By now we already know the new cipher, so we can look ahead
1239 * to see whether the cert we are going to send
1240 * has any authz data attached to it. */
1241 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1242 const unsigned char* const orig_authz = authz;
1244 unsigned authz_count = 0;
1246 /* The authz data contains a number of the following structures:
1247 * uint8_t authz_type
1249 * uint8_t data[length]
1251 * First we walk over it to find the number of authz elements. */
1252 for (i = 0; i < authz_length; i++)
1254 unsigned short length;
1258 if (memchr(s->s3->tlsext_authz_client_types,
1260 s->s3->tlsext_authz_client_types_len) != NULL)
1264 /* n2s increments authz by 2 */
1272 /* Add TLS extension server_authz to the ServerHello message
1273 * 2 bytes for extension type
1274 * 2 bytes for extension length
1275 * 1 byte for the list length
1276 * n bytes for the list */
1277 const unsigned short ext_len = 1 + authz_count;
1279 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1280 s2n(TLSEXT_TYPE_server_authz, ret);
1282 *(ret++) = authz_count;
1283 s->s3->tlsext_authz_promised_to_client = 1;
1287 for (i = 0; i < authz_length; i++)
1289 unsigned short length;
1294 if (memchr(s->s3->tlsext_authz_client_types,
1296 s->s3->tlsext_authz_client_types_len) != NULL)
1299 /* n2s increments authz by 2 */
1306 if ((extdatalen = ret-p-2)== 0)
1313 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1315 unsigned short type;
1316 unsigned short size;
1318 unsigned char *data = *p;
1319 int renegotiate_seen = 0;
1321 s->servername_done = 0;
1322 s->tlsext_status_type = -1;
1323 #ifndef OPENSSL_NO_NEXTPROTONEG
1324 s->s3->next_proto_neg_seen = 0;
1327 #ifndef OPENSSL_NO_HEARTBEATS
1328 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1329 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1331 /* Clear any signature algorithms extension received */
1332 if (s->cert->peer_sigalgs)
1334 OPENSSL_free(s->cert->peer_sigalgs);
1335 s->cert->peer_sigalgs = NULL;
1337 /* Clear any shared sigtnature algorithms */
1338 if (s->cert->shared_sigalgs)
1340 OPENSSL_free(s->cert->shared_sigalgs);
1341 s->cert->shared_sigalgs = NULL;
1344 if (data >= (d+n-2))
1348 if (data > (d+n-len))
1351 while (data <= (d+n-4))
1356 if (data+size > (d+n))
1359 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1361 if (s->tlsext_debug_cb)
1362 s->tlsext_debug_cb(s, 0, type, data, size,
1363 s->tlsext_debug_arg);
1364 /* The servername extension is treated as follows:
1366 - Only the hostname type is supported with a maximum length of 255.
1367 - The servername is rejected if too long or if it contains zeros,
1368 in which case an fatal alert is generated.
1369 - The servername field is maintained together with the session cache.
1370 - When a session is resumed, the servername call back invoked in order
1371 to allow the application to position itself to the right context.
1372 - The servername is acknowledged if it is new for a session or when
1373 it is identical to a previously used for the same session.
1374 Applications can control the behaviour. They can at any time
1375 set a 'desirable' servername for a new SSL object. This can be the
1376 case for example with HTTPS when a Host: header field is received and
1377 a renegotiation is requested. In this case, a possible servername
1378 presented in the new client hello is only acknowledged if it matches
1379 the value of the Host: field.
1380 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1381 if they provide for changing an explicit servername context for the session,
1382 i.e. when the session has been established with a servername extension.
1383 - On session reconnect, the servername extension may be absent.
1387 if (type == TLSEXT_TYPE_server_name)
1389 unsigned char *sdata;
1395 *al = SSL_AD_DECODE_ERROR;
1402 *al = SSL_AD_DECODE_ERROR;
1409 servname_type = *(sdata++);
1415 *al = SSL_AD_DECODE_ERROR;
1418 if (s->servername_done == 0)
1419 switch (servname_type)
1421 case TLSEXT_NAMETYPE_host_name:
1424 if(s->session->tlsext_hostname)
1426 *al = SSL_AD_DECODE_ERROR;
1429 if (len > TLSEXT_MAXLEN_host_name)
1431 *al = TLS1_AD_UNRECOGNIZED_NAME;
1434 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1436 *al = TLS1_AD_INTERNAL_ERROR;
1439 memcpy(s->session->tlsext_hostname, sdata, len);
1440 s->session->tlsext_hostname[len]='\0';
1441 if (strlen(s->session->tlsext_hostname) != len) {
1442 OPENSSL_free(s->session->tlsext_hostname);
1443 s->session->tlsext_hostname = NULL;
1444 *al = TLS1_AD_UNRECOGNIZED_NAME;
1447 s->servername_done = 1;
1451 s->servername_done = s->session->tlsext_hostname
1452 && strlen(s->session->tlsext_hostname) == len
1453 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1465 *al = SSL_AD_DECODE_ERROR;
1470 #ifndef OPENSSL_NO_SRP
1471 else if (type == TLSEXT_TYPE_srp)
1473 if (size <= 0 || ((len = data[0])) != (size -1))
1475 *al = SSL_AD_DECODE_ERROR;
1478 if (s->srp_ctx.login != NULL)
1480 *al = SSL_AD_DECODE_ERROR;
1483 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1485 memcpy(s->srp_ctx.login, &data[1], len);
1486 s->srp_ctx.login[len]='\0';
1488 if (strlen(s->srp_ctx.login) != len)
1490 *al = SSL_AD_DECODE_ERROR;
1496 #ifndef OPENSSL_NO_EC
1497 else if (type == TLSEXT_TYPE_ec_point_formats &&
1498 s->version != DTLS1_VERSION)
1500 unsigned char *sdata = data;
1501 int ecpointformatlist_length = *(sdata++);
1503 if (ecpointformatlist_length != size - 1)
1505 *al = TLS1_AD_DECODE_ERROR;
1510 if(s->session->tlsext_ecpointformatlist)
1512 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1513 s->session->tlsext_ecpointformatlist = NULL;
1515 s->session->tlsext_ecpointformatlist_length = 0;
1516 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1518 *al = TLS1_AD_INTERNAL_ERROR;
1521 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1522 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1525 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1526 sdata = s->session->tlsext_ecpointformatlist;
1527 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1528 fprintf(stderr,"%i ",*(sdata++));
1529 fprintf(stderr,"\n");
1532 else if (type == TLSEXT_TYPE_elliptic_curves &&
1533 s->version != DTLS1_VERSION)
1535 unsigned char *sdata = data;
1536 int ellipticcurvelist_length = (*(sdata++) << 8);
1537 ellipticcurvelist_length += (*(sdata++));
1539 if (ellipticcurvelist_length != size - 2 ||
1540 ellipticcurvelist_length < 1)
1542 *al = TLS1_AD_DECODE_ERROR;
1547 if(s->session->tlsext_ellipticcurvelist)
1549 *al = TLS1_AD_DECODE_ERROR;
1552 s->session->tlsext_ellipticcurvelist_length = 0;
1553 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1555 *al = TLS1_AD_INTERNAL_ERROR;
1558 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1559 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1562 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1563 sdata = s->session->tlsext_ellipticcurvelist;
1564 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1565 fprintf(stderr,"%i ",*(sdata++));
1566 fprintf(stderr,"\n");
1569 #endif /* OPENSSL_NO_EC */
1570 #ifdef TLSEXT_TYPE_opaque_prf_input
1571 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1572 s->version != DTLS1_VERSION)
1574 unsigned char *sdata = data;
1578 *al = SSL_AD_DECODE_ERROR;
1581 n2s(sdata, s->s3->client_opaque_prf_input_len);
1582 if (s->s3->client_opaque_prf_input_len != size - 2)
1584 *al = SSL_AD_DECODE_ERROR;
1588 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1589 OPENSSL_free(s->s3->client_opaque_prf_input);
1590 if (s->s3->client_opaque_prf_input_len == 0)
1591 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1593 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1594 if (s->s3->client_opaque_prf_input == NULL)
1596 *al = TLS1_AD_INTERNAL_ERROR;
1601 else if (type == TLSEXT_TYPE_session_ticket)
1603 if (s->tls_session_ticket_ext_cb &&
1604 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1606 *al = TLS1_AD_INTERNAL_ERROR;
1610 else if (type == TLSEXT_TYPE_renegotiate)
1612 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1614 renegotiate_seen = 1;
1616 else if (type == TLSEXT_TYPE_signature_algorithms)
1619 if (s->cert->peer_sigalgs || size < 2)
1621 *al = SSL_AD_DECODE_ERROR;
1626 if (dsize != size || dsize & 1 || !dsize)
1628 *al = SSL_AD_DECODE_ERROR;
1631 if (!tls1_process_sigalgs(s, data, dsize))
1633 *al = SSL_AD_DECODE_ERROR;
1636 /* If sigalgs received and no shared algorithms fatal
1639 if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
1641 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1642 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
1643 *al = SSL_AD_ILLEGAL_PARAMETER;
1647 else if (type == TLSEXT_TYPE_status_request &&
1648 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1653 *al = SSL_AD_DECODE_ERROR;
1657 s->tlsext_status_type = *data++;
1659 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1661 const unsigned char *sdata;
1663 /* Read in responder_id_list */
1668 *al = SSL_AD_DECODE_ERROR;
1677 *al = SSL_AD_DECODE_ERROR;
1681 dsize -= 2 + idsize;
1685 *al = SSL_AD_DECODE_ERROR;
1690 id = d2i_OCSP_RESPID(NULL,
1694 *al = SSL_AD_DECODE_ERROR;
1699 OCSP_RESPID_free(id);
1700 *al = SSL_AD_DECODE_ERROR;
1703 if (!s->tlsext_ocsp_ids
1704 && !(s->tlsext_ocsp_ids =
1705 sk_OCSP_RESPID_new_null()))
1707 OCSP_RESPID_free(id);
1708 *al = SSL_AD_INTERNAL_ERROR;
1711 if (!sk_OCSP_RESPID_push(
1712 s->tlsext_ocsp_ids, id))
1714 OCSP_RESPID_free(id);
1715 *al = SSL_AD_INTERNAL_ERROR;
1720 /* Read in request_extensions */
1723 *al = SSL_AD_DECODE_ERROR;
1730 *al = SSL_AD_DECODE_ERROR;
1736 if (s->tlsext_ocsp_exts)
1738 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1739 X509_EXTENSION_free);
1742 s->tlsext_ocsp_exts =
1743 d2i_X509_EXTENSIONS(NULL,
1745 if (!s->tlsext_ocsp_exts
1746 || (data + dsize != sdata))
1748 *al = SSL_AD_DECODE_ERROR;
1753 /* We don't know what to do with any other type
1757 s->tlsext_status_type = -1;
1759 #ifndef OPENSSL_NO_HEARTBEATS
1760 else if (type == TLSEXT_TYPE_heartbeat)
1764 case 0x01: /* Client allows us to send HB requests */
1765 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1767 case 0x02: /* Client doesn't accept HB requests */
1768 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1769 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1771 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1776 #ifndef OPENSSL_NO_NEXTPROTONEG
1777 else if (type == TLSEXT_TYPE_next_proto_neg &&
1778 s->s3->tmp.finish_md_len == 0)
1780 /* We shouldn't accept this extension on a
1783 * s->new_session will be set on renegotiation, but we
1784 * probably shouldn't rely that it couldn't be set on
1785 * the initial renegotation too in certain cases (when
1786 * there's some other reason to disallow resuming an
1787 * earlier session -- the current code won't be doing
1788 * anything like that, but this might change).
1790 * A valid sign that there's been a previous handshake
1791 * in this connection is if s->s3->tmp.finish_md_len >
1792 * 0. (We are talking about a check that will happen
1793 * in the Hello protocol round, well before a new
1794 * Finished message could have been computed.) */
1795 s->s3->next_proto_neg_seen = 1;
1799 /* session ticket processed earlier */
1800 else if (type == TLSEXT_TYPE_use_srtp)
1802 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1807 else if (type == TLSEXT_TYPE_server_authz)
1809 unsigned char *sdata = data;
1810 unsigned char server_authz_dataformatlist_length;
1814 *al = TLS1_AD_DECODE_ERROR;
1818 server_authz_dataformatlist_length = *(sdata++);
1820 if (server_authz_dataformatlist_length != size - 1)
1822 *al = TLS1_AD_DECODE_ERROR;
1826 /* Successful session resumption uses the same authz
1827 * information as the original session so we ignore this
1828 * in the case of a session resumption. */
1832 if (s->s3->tlsext_authz_client_types != NULL)
1833 OPENSSL_free(s->s3->tlsext_authz_client_types);
1834 s->s3->tlsext_authz_client_types =
1835 OPENSSL_malloc(server_authz_dataformatlist_length);
1836 if (!s->s3->tlsext_authz_client_types)
1838 *al = TLS1_AD_INTERNAL_ERROR;
1842 s->s3->tlsext_authz_client_types_len =
1843 server_authz_dataformatlist_length;
1844 memcpy(s->s3->tlsext_authz_client_types,
1846 server_authz_dataformatlist_length);
1848 /* Sort the types in order to check for duplicates. */
1849 qsort(s->s3->tlsext_authz_client_types,
1850 server_authz_dataformatlist_length,
1851 1 /* element size */,
1854 for (i = 0; i < server_authz_dataformatlist_length; i++)
1857 s->s3->tlsext_authz_client_types[i] ==
1858 s->s3->tlsext_authz_client_types[i-1])
1860 *al = TLS1_AD_DECODE_ERROR;
1874 /* Need RI if renegotiating */
1876 if (!renegotiate_seen && s->renegotiate &&
1877 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1879 *al = SSL_AD_HANDSHAKE_FAILURE;
1880 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1881 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1884 /* If no signature algorithms extension set default values */
1885 if (!s->cert->peer_sigalgs)
1886 ssl_cert_set_default_md(s->cert);
1891 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1894 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1896 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1900 if (ssl_check_clienthello_tlsext_early(s) <= 0)
1902 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1908 #ifndef OPENSSL_NO_NEXTPROTONEG
1909 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1910 * elements of zero length are allowed and the set of elements must exactly fill
1911 * the length of the block. */
1912 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1914 unsigned int off = 0;
1928 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1930 unsigned short length;
1931 unsigned short type;
1932 unsigned short size;
1933 unsigned char *data = *p;
1934 int tlsext_servername = 0;
1935 int renegotiate_seen = 0;
1937 #ifndef OPENSSL_NO_NEXTPROTONEG
1938 s->s3->next_proto_neg_seen = 0;
1941 #ifndef OPENSSL_NO_HEARTBEATS
1942 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1943 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1946 if (data >= (d+n-2))
1950 if (data+length != d+n)
1952 *al = SSL_AD_DECODE_ERROR;
1956 while(data <= (d+n-4))
1961 if (data+size > (d+n))
1964 if (s->tlsext_debug_cb)
1965 s->tlsext_debug_cb(s, 1, type, data, size,
1966 s->tlsext_debug_arg);
1968 if (type == TLSEXT_TYPE_server_name)
1970 if (s->tlsext_hostname == NULL || size > 0)
1972 *al = TLS1_AD_UNRECOGNIZED_NAME;
1975 tlsext_servername = 1;
1978 #ifndef OPENSSL_NO_EC
1979 else if (type == TLSEXT_TYPE_ec_point_formats &&
1980 s->version != DTLS1_VERSION)
1982 unsigned char *sdata = data;
1983 int ecpointformatlist_length = *(sdata++);
1985 if (ecpointformatlist_length != size - 1 ||
1986 ecpointformatlist_length < 1)
1988 *al = TLS1_AD_DECODE_ERROR;
1991 s->session->tlsext_ecpointformatlist_length = 0;
1992 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1993 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1995 *al = TLS1_AD_INTERNAL_ERROR;
1998 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1999 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2001 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2002 sdata = s->session->tlsext_ecpointformatlist;
2003 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2004 fprintf(stderr,"%i ",*(sdata++));
2005 fprintf(stderr,"\n");
2008 #endif /* OPENSSL_NO_EC */
2010 else if (type == TLSEXT_TYPE_session_ticket)
2012 if (s->tls_session_ticket_ext_cb &&
2013 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2015 *al = TLS1_AD_INTERNAL_ERROR;
2018 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2021 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2024 s->tlsext_ticket_expected = 1;
2026 #ifdef TLSEXT_TYPE_opaque_prf_input
2027 else if (type == TLSEXT_TYPE_opaque_prf_input &&
2028 s->version != DTLS1_VERSION)
2030 unsigned char *sdata = data;
2034 *al = SSL_AD_DECODE_ERROR;
2037 n2s(sdata, s->s3->server_opaque_prf_input_len);
2038 if (s->s3->server_opaque_prf_input_len != size - 2)
2040 *al = SSL_AD_DECODE_ERROR;
2044 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2045 OPENSSL_free(s->s3->server_opaque_prf_input);
2046 if (s->s3->server_opaque_prf_input_len == 0)
2047 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2049 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2051 if (s->s3->server_opaque_prf_input == NULL)
2053 *al = TLS1_AD_INTERNAL_ERROR;
2058 else if (type == TLSEXT_TYPE_status_request &&
2059 s->version != DTLS1_VERSION)
2061 /* MUST be empty and only sent if we've requested
2062 * a status request message.
2064 if ((s->tlsext_status_type == -1) || (size > 0))
2066 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2069 /* Set flag to expect CertificateStatus message */
2070 s->tlsext_status_expected = 1;
2072 #ifndef OPENSSL_NO_NEXTPROTONEG
2073 else if (type == TLSEXT_TYPE_next_proto_neg &&
2074 s->s3->tmp.finish_md_len == 0)
2076 unsigned char *selected;
2077 unsigned char selected_len;
2079 /* We must have requested it. */
2080 if ((s->ctx->next_proto_select_cb == NULL))
2082 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2085 /* The data must be valid */
2086 if (!ssl_next_proto_validate(data, size))
2088 *al = TLS1_AD_DECODE_ERROR;
2091 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2093 *al = TLS1_AD_INTERNAL_ERROR;
2096 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2097 if (!s->next_proto_negotiated)
2099 *al = TLS1_AD_INTERNAL_ERROR;
2102 memcpy(s->next_proto_negotiated, selected, selected_len);
2103 s->next_proto_negotiated_len = selected_len;
2104 s->s3->next_proto_neg_seen = 1;
2107 else if (type == TLSEXT_TYPE_renegotiate)
2109 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2111 renegotiate_seen = 1;
2113 #ifndef OPENSSL_NO_HEARTBEATS
2114 else if (type == TLSEXT_TYPE_heartbeat)
2118 case 0x01: /* Server allows us to send HB requests */
2119 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2121 case 0x02: /* Server doesn't accept HB requests */
2122 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2123 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2125 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2130 else if (type == TLSEXT_TYPE_use_srtp)
2132 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2137 else if (type == TLSEXT_TYPE_server_authz)
2139 /* We only support audit proofs. It's an error to send
2140 * an authz hello extension if the client
2141 * didn't request a proof. */
2142 unsigned char *sdata = data;
2143 unsigned char server_authz_dataformatlist_length;
2145 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2147 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2153 *al = TLS1_AD_DECODE_ERROR;
2157 server_authz_dataformatlist_length = *(sdata++);
2158 if (server_authz_dataformatlist_length != size - 1)
2160 *al = TLS1_AD_DECODE_ERROR;
2164 /* We only support audit proofs, so a legal ServerHello
2165 * authz list contains exactly one entry. */
2166 if (server_authz_dataformatlist_length != 1 ||
2167 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2169 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2173 s->s3->tlsext_authz_server_promised = 1;
2181 *al = SSL_AD_DECODE_ERROR;
2185 if (!s->hit && tlsext_servername == 1)
2187 if (s->tlsext_hostname)
2189 if (s->session->tlsext_hostname == NULL)
2191 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2192 if (!s->session->tlsext_hostname)
2194 *al = SSL_AD_UNRECOGNIZED_NAME;
2200 *al = SSL_AD_DECODE_ERROR;
2210 /* Determine if we need to see RI. Strictly speaking if we want to
2211 * avoid an attack we should *always* see RI even on initial server
2212 * hello because the client doesn't see any renegotiation during an
2213 * attack. However this would mean we could not connect to any server
2214 * which doesn't support RI so for the immediate future tolerate RI
2215 * absence on initial connect only.
2217 if (!renegotiate_seen
2218 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2219 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2221 *al = SSL_AD_HANDSHAKE_FAILURE;
2222 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2223 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2231 int ssl_prepare_clienthello_tlsext(SSL *s)
2234 #ifdef TLSEXT_TYPE_opaque_prf_input
2238 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2240 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2245 if (s->tlsext_opaque_prf_input != NULL)
2247 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2248 OPENSSL_free(s->s3->client_opaque_prf_input);
2250 if (s->tlsext_opaque_prf_input_len == 0)
2251 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2253 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2254 if (s->s3->client_opaque_prf_input == NULL)
2256 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2259 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2263 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2264 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2271 int ssl_prepare_serverhello_tlsext(SSL *s)
2273 #ifndef OPENSSL_NO_EC
2274 /* If we are server and using an ECC cipher suite, send the point formats we support
2275 * if the client sent us an ECPointsFormat extension. Note that the server is not
2276 * supposed to send an EllipticCurves extension.
2279 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2280 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2281 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2282 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2286 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2287 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2289 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2292 s->tlsext_ecpointformatlist_length = 3;
2293 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2294 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2295 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2297 #endif /* OPENSSL_NO_EC */
2302 static int ssl_check_clienthello_tlsext_early(SSL *s)
2304 int ret=SSL_TLSEXT_ERR_NOACK;
2305 int al = SSL_AD_UNRECOGNIZED_NAME;
2307 #ifndef OPENSSL_NO_EC
2308 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2309 * ssl3_choose_cipher in s3_lib.c.
2311 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2312 * ssl3_choose_cipher in s3_lib.c.
2316 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2317 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2318 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2319 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2321 #ifdef TLSEXT_TYPE_opaque_prf_input
2323 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2324 * but we might be sending an alert in response to the client hello,
2325 * so this has to happen here in
2326 * ssl_check_clienthello_tlsext_early(). */
2330 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2332 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2335 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2336 al = SSL_AD_INTERNAL_ERROR;
2341 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2342 OPENSSL_free(s->s3->server_opaque_prf_input);
2343 s->s3->server_opaque_prf_input = NULL;
2345 if (s->tlsext_opaque_prf_input != NULL)
2347 if (s->s3->client_opaque_prf_input != NULL &&
2348 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2350 /* can only use this extension if we have a server opaque PRF input
2351 * of the same length as the client opaque PRF input! */
2353 if (s->tlsext_opaque_prf_input_len == 0)
2354 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2356 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2357 if (s->s3->server_opaque_prf_input == NULL)
2359 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2360 al = SSL_AD_INTERNAL_ERROR;
2363 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2367 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2369 /* The callback wants to enforce use of the extension,
2370 * but we can't do that with the client opaque PRF input;
2371 * abort the handshake.
2373 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2374 al = SSL_AD_HANDSHAKE_FAILURE;
2382 case SSL_TLSEXT_ERR_ALERT_FATAL:
2383 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2386 case SSL_TLSEXT_ERR_ALERT_WARNING:
2387 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2390 case SSL_TLSEXT_ERR_NOACK:
2391 s->servername_done=0;
2397 int ssl_check_clienthello_tlsext_late(SSL *s)
2399 int ret = SSL_TLSEXT_ERR_OK;
2402 /* If status request then ask callback what to do.
2403 * Note: this must be called after servername callbacks in case
2404 * the certificate has changed, and must be called after the cipher
2405 * has been chosen because this may influence which certificate is sent
2407 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2410 CERT_PKEY *certpkey;
2411 certpkey = ssl_get_server_send_pkey(s);
2412 /* If no certificate can't return certificate status */
2413 if (certpkey == NULL)
2415 s->tlsext_status_expected = 0;
2418 /* Set current certificate to one we will use so
2419 * SSL_get_certificate et al can pick it up.
2421 s->cert->key = certpkey;
2422 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2425 /* We don't want to send a status request response */
2426 case SSL_TLSEXT_ERR_NOACK:
2427 s->tlsext_status_expected = 0;
2429 /* status request response should be sent */
2430 case SSL_TLSEXT_ERR_OK:
2431 if (s->tlsext_ocsp_resp)
2432 s->tlsext_status_expected = 1;
2434 s->tlsext_status_expected = 0;
2436 /* something bad happened */
2437 case SSL_TLSEXT_ERR_ALERT_FATAL:
2438 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2439 al = SSL_AD_INTERNAL_ERROR;
2444 s->tlsext_status_expected = 0;
2449 case SSL_TLSEXT_ERR_ALERT_FATAL:
2450 ssl3_send_alert(s, SSL3_AL_FATAL,al);
2453 case SSL_TLSEXT_ERR_ALERT_WARNING:
2454 ssl3_send_alert(s, SSL3_AL_WARNING,al);
2462 int ssl_check_serverhello_tlsext(SSL *s)
2464 int ret=SSL_TLSEXT_ERR_NOACK;
2465 int al = SSL_AD_UNRECOGNIZED_NAME;
2467 #ifndef OPENSSL_NO_EC
2468 /* If we are client and using an elliptic curve cryptography cipher
2469 * suite, then if server returns an EC point formats lists extension
2470 * it must contain uncompressed.
2472 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2473 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2474 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2475 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2476 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2478 /* we are using an ECC cipher */
2480 unsigned char *list;
2481 int found_uncompressed = 0;
2482 list = s->session->tlsext_ecpointformatlist;
2483 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2485 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2487 found_uncompressed = 1;
2491 if (!found_uncompressed)
2493 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2497 ret = SSL_TLSEXT_ERR_OK;
2498 #endif /* OPENSSL_NO_EC */
2500 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2501 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2502 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2503 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2505 #ifdef TLSEXT_TYPE_opaque_prf_input
2506 if (s->s3->server_opaque_prf_input_len > 0)
2508 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2509 * So first verify that we really have a value from the server too. */
2511 if (s->s3->server_opaque_prf_input == NULL)
2513 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2514 al = SSL_AD_HANDSHAKE_FAILURE;
2517 /* Anytime the server *has* sent an opaque PRF input, we need to check
2518 * that we have a client opaque PRF input of the same size. */
2519 if (s->s3->client_opaque_prf_input == NULL ||
2520 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2522 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2523 al = SSL_AD_ILLEGAL_PARAMETER;
2528 /* If we've requested certificate status and we wont get one
2531 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2532 && s->ctx && s->ctx->tlsext_status_cb)
2535 /* Set resp to NULL, resplen to -1 so callback knows
2536 * there is no response.
2538 if (s->tlsext_ocsp_resp)
2540 OPENSSL_free(s->tlsext_ocsp_resp);
2541 s->tlsext_ocsp_resp = NULL;
2543 s->tlsext_ocsp_resplen = -1;
2544 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2547 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2548 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2552 al = SSL_AD_INTERNAL_ERROR;
2553 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2559 case SSL_TLSEXT_ERR_ALERT_FATAL:
2560 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2563 case SSL_TLSEXT_ERR_ALERT_WARNING:
2564 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2567 case SSL_TLSEXT_ERR_NOACK:
2568 s->servername_done=0;
2574 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2577 if (s->version < SSL3_VERSION)
2579 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2581 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2585 if (ssl_check_serverhello_tlsext(s) <= 0)
2587 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2593 /* Since the server cache lookup is done early on in the processing of the
2594 * ClientHello, and other operations depend on the result, we need to handle
2595 * any TLS session ticket extension at the same time.
2597 * session_id: points at the session ID in the ClientHello. This code will
2598 * read past the end of this in order to parse out the session ticket
2599 * extension, if any.
2600 * len: the length of the session ID.
2601 * limit: a pointer to the first byte after the ClientHello.
2602 * ret: (output) on return, if a ticket was decrypted, then this is set to
2603 * point to the resulting session.
2605 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2606 * ciphersuite, in which case we have no use for session tickets and one will
2607 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2610 * -1: fatal error, either from parsing or decrypting the ticket.
2611 * 0: no ticket was found (or was ignored, based on settings).
2612 * 1: a zero length extension was found, indicating that the client supports
2613 * session tickets but doesn't currently have one to offer.
2614 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2615 * couldn't be decrypted because of a non-fatal error.
2616 * 3: a ticket was successfully decrypted and *ret was set.
2619 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2620 * a new session ticket to the client because the client indicated support
2621 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2622 * a session ticket or we couldn't use the one it gave us, or if
2623 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2624 * Otherwise, s->tlsext_ticket_expected is set to 0.
2626 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2627 const unsigned char *limit, SSL_SESSION **ret)
2629 /* Point after session ID in client hello */
2630 const unsigned char *p = session_id + len;
2634 s->tlsext_ticket_expected = 0;
2636 /* If tickets disabled behave as if no ticket present
2637 * to permit stateful resumption.
2639 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2641 if ((s->version <= SSL3_VERSION) || !limit)
2645 /* Skip past DTLS cookie */
2646 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2653 /* Skip past cipher list */
2658 /* Skip past compression algorithm list */
2663 /* Now at start of extensions */
2664 if ((p + 2) >= limit)
2667 while ((p + 4) <= limit)
2669 unsigned short type, size;
2672 if (p + size > limit)
2674 if (type == TLSEXT_TYPE_session_ticket)
2679 /* The client will accept a ticket but doesn't
2680 * currently have one. */
2681 s->tlsext_ticket_expected = 1;
2684 if (s->tls_session_secret_cb)
2686 /* Indicate that the ticket couldn't be
2687 * decrypted rather than generating the session
2688 * from ticket now, trigger abbreviated
2689 * handshake based on external mechanism to
2690 * calculate the master secret later. */
2693 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2696 case 2: /* ticket couldn't be decrypted */
2697 s->tlsext_ticket_expected = 1;
2699 case 3: /* ticket was decrypted */
2701 case 4: /* ticket decrypted but need to renew */
2702 s->tlsext_ticket_expected = 1;
2704 default: /* fatal error */
2713 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2715 * etick: points to the body of the session ticket extension.
2716 * eticklen: the length of the session tickets extenion.
2717 * sess_id: points at the session ID.
2718 * sesslen: the length of the session ID.
2719 * psess: (output) on return, if a ticket was decrypted, then this is set to
2720 * point to the resulting session.
2723 * -1: fatal error, either from parsing or decrypting the ticket.
2724 * 2: the ticket couldn't be decrypted.
2725 * 3: a ticket was successfully decrypted and *psess was set.
2726 * 4: same as 3, but the ticket needs to be renewed.
2728 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2729 const unsigned char *sess_id, int sesslen,
2730 SSL_SESSION **psess)
2733 unsigned char *sdec;
2734 const unsigned char *p;
2735 int slen, mlen, renew_ticket = 0;
2736 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2739 SSL_CTX *tctx = s->initial_ctx;
2740 /* Need at least keyname + iv + some encrypted data */
2743 /* Initialize session ticket encryption and HMAC contexts */
2744 HMAC_CTX_init(&hctx);
2745 EVP_CIPHER_CTX_init(&ctx);
2746 if (tctx->tlsext_ticket_key_cb)
2748 unsigned char *nctick = (unsigned char *)etick;
2749 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2760 /* Check key name matches */
2761 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2763 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2764 tlsext_tick_md(), NULL);
2765 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2766 tctx->tlsext_tick_aes_key, etick + 16);
2768 /* Attempt to process session ticket, first conduct sanity and
2769 * integrity checks on ticket.
2771 mlen = HMAC_size(&hctx);
2774 EVP_CIPHER_CTX_cleanup(&ctx);
2778 /* Check HMAC of encrypted ticket */
2779 HMAC_Update(&hctx, etick, eticklen);
2780 HMAC_Final(&hctx, tick_hmac, NULL);
2781 HMAC_CTX_cleanup(&hctx);
2782 if (memcmp(tick_hmac, etick + eticklen, mlen))
2784 /* Attempt to decrypt session data */
2785 /* Move p after IV to start of encrypted ticket, update length */
2786 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2787 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2788 sdec = OPENSSL_malloc(eticklen);
2791 EVP_CIPHER_CTX_cleanup(&ctx);
2794 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2795 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2798 EVP_CIPHER_CTX_cleanup(&ctx);
2801 sess = d2i_SSL_SESSION(NULL, &p, slen);
2805 /* The session ID, if non-empty, is used by some clients to
2806 * detect that the ticket has been accepted. So we copy it to
2807 * the session structure. If it is empty set length to zero
2808 * as required by standard.
2811 memcpy(sess->session_id, sess_id, sesslen);
2812 sess->session_id_length = sesslen;
2820 /* For session parse failure, indicate that we need to send a new
2825 /* Tables to translate from NIDs to TLS v1.2 ids */
2833 static tls12_lookup tls12_md[] = {
2834 {NID_md5, TLSEXT_hash_md5},
2835 {NID_sha1, TLSEXT_hash_sha1},
2836 {NID_sha224, TLSEXT_hash_sha224},
2837 {NID_sha256, TLSEXT_hash_sha256},
2838 {NID_sha384, TLSEXT_hash_sha384},
2839 {NID_sha512, TLSEXT_hash_sha512}
2842 static tls12_lookup tls12_sig[] = {
2843 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2844 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2845 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2848 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2851 for (i = 0; i < tlen; i++)
2853 if (table[i].nid == nid)
2859 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2862 for (i = 0; i < tlen; i++)
2864 if ((table[i].id) == id)
2865 return table[i].nid;
2870 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2875 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2876 sizeof(tls12_md)/sizeof(tls12_lookup));
2879 sig_id = tls12_get_sigid(pk);
2882 p[0] = (unsigned char)md_id;
2883 p[1] = (unsigned char)sig_id;
2887 int tls12_get_sigid(const EVP_PKEY *pk)
2889 return tls12_find_id(pk->type, tls12_sig,
2890 sizeof(tls12_sig)/sizeof(tls12_lookup));
2893 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2897 #ifndef OPENSSL_NO_MD5
2898 case TLSEXT_hash_md5:
2905 #ifndef OPENSSL_NO_SHA
2906 case TLSEXT_hash_sha1:
2909 #ifndef OPENSSL_NO_SHA256
2910 case TLSEXT_hash_sha224:
2911 return EVP_sha224();
2913 case TLSEXT_hash_sha256:
2914 return EVP_sha256();
2916 #ifndef OPENSSL_NO_SHA512
2917 case TLSEXT_hash_sha384:
2918 return EVP_sha384();
2920 case TLSEXT_hash_sha512:
2921 return EVP_sha512();
2929 static int tls12_get_pkey_idx(unsigned char sig_alg)
2933 #ifndef OPENSSL_NO_RSA
2934 case TLSEXT_signature_rsa:
2935 return SSL_PKEY_RSA_SIGN;
2937 #ifndef OPENSSL_NO_DSA
2938 case TLSEXT_signature_dsa:
2939 return SSL_PKEY_DSA_SIGN;
2941 #ifndef OPENSSL_NO_ECDSA
2942 case TLSEXT_signature_ecdsa:
2943 return SSL_PKEY_ECC;
2949 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
2950 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
2951 int *psignhash_nid, const unsigned char *data)
2953 int sign_nid, hash_nid;
2954 if (!phash_nid && !psign_nid && !psignhash_nid)
2956 if (phash_nid || psignhash_nid)
2958 hash_nid = tls12_find_nid(data[0], tls12_md,
2959 sizeof(tls12_md)/sizeof(tls12_lookup));
2961 *phash_nid = hash_nid;
2963 if (psign_nid || psignhash_nid)
2965 sign_nid = tls12_find_nid(data[1], tls12_sig,
2966 sizeof(tls12_sig)/sizeof(tls12_lookup));
2968 *psign_nid = sign_nid;
2972 if (sign_nid && hash_nid)
2973 OBJ_find_sigid_by_algs(psignhash_nid,
2974 hash_nid, sign_nid);
2976 *psignhash_nid = NID_undef;
2979 /* Given preference and allowed sigalgs set shared sigalgs */
2980 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
2981 const unsigned char *pref, size_t preflen,
2982 const unsigned char *allow, size_t allowlen)
2984 const unsigned char *ptmp, *atmp;
2985 size_t i, j, nmatch = 0;
2986 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
2988 /* Skip disabled hashes or signature algorithms */
2989 if (tls12_get_hash(ptmp[0]) == NULL)
2991 if (tls12_get_pkey_idx(ptmp[1]) == -1)
2993 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
2995 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3000 shsig->rhash = ptmp[0];
3001 shsig->rsign = ptmp[1];
3002 tls1_lookup_sigalg(&shsig->hash_nid,
3004 &shsig->signandhash_nid,
3015 /* Set shared signature algorithms for SSL structures */
3016 static int tls1_set_shared_sigalgs(SSL *s)
3018 const unsigned char *pref, *allow, *conf;
3019 size_t preflen, allowlen, conflen;
3021 TLS_SIGALGS *salgs = NULL;
3023 conf = c->conf_sigalgs;
3025 conflen = c->conf_sigalgslen;
3028 conf = tls12_sigalgs;
3029 conflen = sizeof(tls12_sigalgs);
3035 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
3039 allow = c->peer_sigalgs;
3040 allowlen = c->peer_sigalgslen;
3046 pref = c->peer_sigalgs;
3047 preflen = c->peer_sigalgslen;
3049 nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3052 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3055 nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3056 c->shared_sigalgs = salgs;
3057 c->shared_sigalgslen = nmatch;
3062 /* Set preferred digest for each key type */
3064 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3070 TLS_SIGALGS *sigptr;
3071 /* Extension ignored for TLS versions below 1.2 */
3072 if (TLS1_get_version(s) < TLS1_2_VERSION)
3074 /* Should never happen */
3078 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
3079 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
3080 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
3081 c->pkeys[SSL_PKEY_ECC].digest = NULL;
3083 c->peer_sigalgs = OPENSSL_malloc(dsize);
3084 if (!c->peer_sigalgs)
3086 c->peer_sigalgslen = dsize;
3087 memcpy(c->peer_sigalgs, data, dsize);
3089 tls1_set_shared_sigalgs(s);
3091 for (i = 0, sigptr = c->shared_sigalgs;
3092 i < c->shared_sigalgslen; i++, sigptr++)
3094 idx = tls12_get_pkey_idx(sigptr->rsign);
3095 if (idx > 0 && c->pkeys[idx].digest == NULL)
3097 md = tls12_get_hash(sigptr->rhash);
3098 c->pkeys[idx].digest = md;
3099 if (idx == SSL_PKEY_RSA_SIGN)
3100 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3104 /* In strict mode leave unset digests as NULL to indicate we can't
3105 * use the certificate for signing.
3107 if (!(s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT))
3109 /* Set any remaining keys to default values. NOTE: if alg is
3110 * not supported it stays as NULL.
3112 #ifndef OPENSSL_NO_DSA
3113 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3114 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3116 #ifndef OPENSSL_NO_RSA
3117 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3119 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3120 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3123 #ifndef OPENSSL_NO_ECDSA
3124 if (!c->pkeys[SSL_PKEY_ECC].digest)
3125 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3132 int SSL_get_sigalgs(SSL *s, int idx,
3133 int *psign, int *phash, int *psignhash,
3134 unsigned char *rsig, unsigned char *rhash)
3136 const unsigned char *psig = s->cert->peer_sigalgs;
3142 if (idx >= (int)s->cert->peer_sigalgslen)
3149 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3151 return s->cert->peer_sigalgslen / 2;
3154 int SSL_get_shared_sigalgs(SSL *s, int idx,
3155 int *psign, int *phash, int *psignhash,
3156 unsigned char *rsig, unsigned char *rhash)
3158 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3159 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3163 *phash = shsigalgs->hash_nid;
3165 *psign = shsigalgs->sign_nid;
3167 *psignhash = shsigalgs->signandhash_nid;
3169 *rsig = shsigalgs->rsign;
3171 *rhash = shsigalgs->rhash;
3172 return s->cert->shared_sigalgslen;
3176 #ifndef OPENSSL_NO_HEARTBEATS
3178 tls1_process_heartbeat(SSL *s)
3180 unsigned char *p = &s->s3->rrec.data[0], *pl;
3181 unsigned short hbtype;
3182 unsigned int payload;
3183 unsigned int padding = 16; /* Use minimum padding */
3185 /* Read type and payload length first */
3190 if (s->msg_callback)
3191 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3192 &s->s3->rrec.data[0], s->s3->rrec.length,
3193 s, s->msg_callback_arg);
3195 if (hbtype == TLS1_HB_REQUEST)
3197 unsigned char *buffer, *bp;
3200 /* Allocate memory for the response, size is 1 bytes
3201 * message type, plus 2 bytes payload length, plus
3202 * payload, plus padding
3204 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3207 /* Enter response type, length and copy payload */
3208 *bp++ = TLS1_HB_RESPONSE;
3210 memcpy(bp, pl, payload);
3212 /* Random padding */
3213 RAND_pseudo_bytes(bp, padding);
3215 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3217 if (r >= 0 && s->msg_callback)
3218 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3219 buffer, 3 + payload + padding,
3220 s, s->msg_callback_arg);
3222 OPENSSL_free(buffer);
3227 else if (hbtype == TLS1_HB_RESPONSE)
3231 /* We only send sequence numbers (2 bytes unsigned int),
3232 * and 16 random bytes, so we just try to read the
3233 * sequence number */
3236 if (payload == 18 && seq == s->tlsext_hb_seq)
3239 s->tlsext_hb_pending = 0;
3247 tls1_heartbeat(SSL *s)
3249 unsigned char *buf, *p;
3251 unsigned int payload = 18; /* Sequence number + random bytes */
3252 unsigned int padding = 16; /* Use minimum padding */
3254 /* Only send if peer supports and accepts HB requests... */
3255 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3256 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3258 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3262 /* ...and there is none in flight yet... */
3263 if (s->tlsext_hb_pending)
3265 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3269 /* ...and no handshake in progress. */
3270 if (SSL_in_init(s) || s->in_handshake)
3272 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3276 /* Check if padding is too long, payload and padding
3277 * must not exceed 2^14 - 3 = 16381 bytes in total.
3279 OPENSSL_assert(payload + padding <= 16381);
3281 /* Create HeartBeat message, we just use a sequence number
3282 * as payload to distuingish different messages and add
3283 * some random stuff.
3284 * - Message Type, 1 byte
3285 * - Payload Length, 2 bytes (unsigned int)
3286 * - Payload, the sequence number (2 bytes uint)
3287 * - Payload, random bytes (16 bytes uint)
3290 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3293 *p++ = TLS1_HB_REQUEST;
3294 /* Payload length (18 bytes here) */
3296 /* Sequence number */
3297 s2n(s->tlsext_hb_seq, p);
3298 /* 16 random bytes */
3299 RAND_pseudo_bytes(p, 16);
3301 /* Random padding */
3302 RAND_pseudo_bytes(p, padding);
3304 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3307 if (s->msg_callback)
3308 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3309 buf, 3 + payload + padding,
3310 s, s->msg_callback_arg);
3312 s->tlsext_hb_pending = 1;
3321 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3326 int sigalgs[MAX_SIGALGLEN];
3329 static int sig_cb(const char *elem, int len, void *arg)
3331 sig_cb_st *sarg = arg;
3334 int sig_alg, hash_alg;
3335 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3337 if (len > (int)(sizeof(etmp) - 1))
3339 memcpy(etmp, elem, len);
3341 p = strchr(etmp, '+');
3349 if (!strcmp(etmp, "RSA"))
3350 sig_alg = EVP_PKEY_RSA;
3351 else if (!strcmp(etmp, "DSA"))
3352 sig_alg = EVP_PKEY_DSA;
3353 else if (!strcmp(etmp, "ECDSA"))
3354 sig_alg = EVP_PKEY_EC;
3357 hash_alg = OBJ_sn2nid(p);
3358 if (hash_alg == NID_undef)
3359 hash_alg = OBJ_ln2nid(p);
3360 if (hash_alg == NID_undef)
3363 for (i = 0; i < sarg->sigalgcnt; i+=2)
3365 if (sarg->sigalgs[i] == sig_alg
3366 && sarg->sigalgs[i + 1] == hash_alg)
3369 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3370 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3374 /* Set suppored signature algorithms based on a colon separated list
3375 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3376 int tls1_set_sigalgs_list(CERT *c, const char *str)
3380 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3382 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt);
3385 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen)
3387 unsigned char *sigalgs, *sptr;
3392 sigalgs = OPENSSL_malloc(salglen);
3393 if (sigalgs == NULL)
3395 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
3397 rhash = tls12_find_id(*psig_nids++, tls12_md,
3398 sizeof(tls12_md)/sizeof(tls12_lookup));
3399 rsign = tls12_find_id(*psig_nids++, tls12_sig,
3400 sizeof(tls12_sig)/sizeof(tls12_lookup));
3402 if (rhash == -1 || rsign == -1)
3408 if (c->conf_sigalgs)
3409 OPENSSL_free(c->conf_sigalgs);
3411 c->conf_sigalgs = sigalgs;
3412 c->conf_sigalgslen = salglen;
3416 OPENSSL_free(sigalgs);
3420 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
3424 if (default_nid == -1)
3426 sig_nid = X509_get_signature_nid(x);
3428 return sig_nid == default_nid ? 1 : 0;
3429 for (i = 0; i < c->shared_sigalgslen; i++)
3430 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
3435 /* Check certificate chain is consistent with TLS extensions and is
3438 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
3442 int rv = CERT_PKEY_INVALID;
3443 CERT_PKEY *cpk = NULL;
3447 cpk = c->pkeys + idx;
3449 pk = cpk->privatekey;
3451 /* If no cert or key, forget it */
3457 idx = ssl_cert_type(x, pk);
3462 /* Check all signature algorithms are consistent with
3463 * signature algorithms extension if TLS 1.2 or later
3466 if (TLS1_get_version(s) >= TLS1_2_VERSION
3467 && c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3470 unsigned char rsign = 0;
3471 if (c->peer_sigalgs)
3473 /* If no sigalgs extension use defaults from RFC5246 */
3478 case SSL_PKEY_RSA_ENC:
3479 case SSL_PKEY_RSA_SIGN:
3480 case SSL_PKEY_DH_RSA:
3481 rsign = TLSEXT_signature_rsa;
3482 default_nid = NID_sha1WithRSAEncryption;
3485 case SSL_PKEY_DSA_SIGN:
3486 case SSL_PKEY_DH_DSA:
3487 rsign = TLSEXT_signature_dsa;
3488 default_nid = NID_dsaWithSHA1;
3492 rsign = TLSEXT_signature_ecdsa;
3493 default_nid = NID_ecdsa_with_SHA1;
3501 /* If peer sent no signature algorithms extension and we
3502 * have set preferred signature algorithms check we support
3505 if (default_nid > 0 && c->conf_sigalgs)
3508 const unsigned char *p = c->conf_sigalgs;
3509 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
3511 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
3514 if (j == c->conf_sigalgslen)
3517 /* Check signature algorithm of each cert in chain */
3518 if (!tls1_check_sig_alg(c, x, default_nid))
3520 for (i = 0; i < sk_X509_num(chain); i++)
3522 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
3528 /* Check cert parameters are consistent */
3529 if (!tls1_check_cert_param(s, x))
3531 /* In strict mode check rest of chain too */
3532 if (c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3534 for (i = 0; i < sk_X509_num(chain); i++)
3536 if (!tls1_check_cert_param(s, sk_X509_value(chain, i)))
3540 rv = CERT_PKEY_VALID;
3545 if (rv && cpk->digest)
3546 rv |= CERT_PKEY_SIGN;
3547 cpk->valid_flags = rv;
3552 /* Set validity of certificates in an SSL structure */
3553 void tls1_set_cert_validity(SSL *s)
3555 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
3556 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
3557 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
3558 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
3559 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
3560 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);