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_psigalgs(SSL *s, const unsigned char **psigs)
640 /* If server use client authentication sigalgs if not NULL */
641 if (s->server && s->cert->client_sigalgs)
643 *psigs = s->cert->client_sigalgs;
644 return s->cert->client_sigalgslen;
646 else if (s->cert->conf_sigalgs)
648 *psigs = s->cert->conf_sigalgs;
649 return s->cert->conf_sigalgslen;
653 *psigs = tls12_sigalgs;
655 /* If FIPS mode don't include MD5 which is last */
657 return sizeof(tls12_sigalgs) - 2;
660 return sizeof(tls12_sigalgs);
663 /* Get a mask of disabled algorithms: an algorithm is disabled
664 * if it isn't supported or doesn't appear in supported signature
665 * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
666 * session and not global settings.
669 void ssl_set_client_disabled(SSL *s)
672 const unsigned char *sigalgs;
673 size_t i, sigalgslen;
674 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
677 /* If less than TLS 1.2 don't allow TLS 1.2 only ciphers */
678 if (TLS1_get_version(s) < TLS1_2_VERSION)
679 c->mask_ssl = SSL_TLSV1_2;
682 /* Now go through all signature algorithms seeing if we support
683 * any for RSA, DSA, ECDSA. Do this for all versions not just
686 sigalgslen = tls12_get_psigalgs(s, &sigalgs);
687 for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
691 #ifndef OPENSSL_NO_RSA
692 case TLSEXT_signature_rsa:
696 #ifndef OPENSSL_NO_DSA
697 case TLSEXT_signature_dsa:
701 #ifndef OPENSSL_NO_ECDSA
702 case TLSEXT_signature_ecdsa:
708 /* Disable auth and static DH if we don't include any appropriate
709 * signature algorithms.
713 c->mask_a |= SSL_aRSA;
714 c->mask_k |= SSL_kDHr|SSL_kECDHr;
718 c->mask_a |= SSL_aDSS;
719 c->mask_k |= SSL_kDHd;
723 c->mask_a |= SSL_aECDSA;
724 c->mask_k |= SSL_kECDHe;
726 #ifndef OPENSSL_NO_KRB5
727 if (!kssl_tgt_is_available(s->kssl_ctx))
729 c->mask_a |= SSL_aKRB5;
730 c->mask_k |= SSL_kKRB5;
733 #ifndef OPENSSL_NO_PSK
734 /* with PSK there must be client callback set */
735 if (!s->psk_client_callback)
737 c->mask_a |= SSL_aPSK;
738 c->mask_k |= SSL_kPSK;
740 #endif /* OPENSSL_NO_PSK */
744 /* byte_compare is a compare function for qsort(3) that compares bytes. */
745 static int byte_compare(const void *in_a, const void *in_b)
747 unsigned char a = *((const unsigned char*) in_a);
748 unsigned char b = *((const unsigned char*) in_b);
757 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
760 unsigned char *ret = p;
761 #ifndef OPENSSL_NO_EC
762 /* See if we support any ECC ciphersuites */
764 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
767 unsigned long alg_k, alg_a;
768 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
770 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
772 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
774 alg_k = c->algorithm_mkey;
775 alg_a = c->algorithm_auth;
776 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
777 || (alg_a & SSL_aECDSA)))
786 /* don't add extensions for SSLv3 unless doing secure renegotiation */
787 if (s->client_version == SSL3_VERSION
788 && !s->s3->send_connection_binding)
793 if (ret>=limit) return NULL; /* this really never occurs, but ... */
795 if (s->tlsext_hostname != NULL)
797 /* Add TLS extension servername to the Client Hello message */
798 unsigned long size_str;
801 /* check for enough space.
802 4 for the servername type and entension length
803 2 for servernamelist length
804 1 for the hostname type
805 2 for hostname length
809 if ((lenmax = limit - ret - 9) < 0
810 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
813 /* extension type and length */
814 s2n(TLSEXT_TYPE_server_name,ret);
817 /* length of servername list */
820 /* hostname type, length and hostname */
821 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
823 memcpy(ret, s->tlsext_hostname, size_str);
827 /* Add RI if renegotiating */
832 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
834 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
838 if((limit - p - 4 - el) < 0) return NULL;
840 s2n(TLSEXT_TYPE_renegotiate,ret);
843 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
845 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
852 #ifndef OPENSSL_NO_SRP
853 /* Add SRP username if there is one */
854 if (s->srp_ctx.login != NULL)
855 { /* Add TLS extension SRP username to the Client Hello message */
857 int login_len = strlen(s->srp_ctx.login);
858 if (login_len > 255 || login_len == 0)
860 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
864 /* check for enough space.
865 4 for the srp type type and entension length
866 1 for the srp user identity
867 + srp user identity length
869 if ((limit - ret - 5 - login_len) < 0) return NULL;
871 /* fill in the extension */
872 s2n(TLSEXT_TYPE_srp,ret);
873 s2n(login_len+1,ret);
874 (*ret++) = (unsigned char) login_len;
875 memcpy(ret, s->srp_ctx.login, login_len);
880 #ifndef OPENSSL_NO_EC
883 /* Add TLS extension ECPointFormats to the ClientHello message */
885 const unsigned char *plist;
887 /* If we have a custom point format list use it otherwise
889 plist = s->tlsext_ecpointformatlist;
891 plistlen = s->tlsext_ecpointformatlist_length;
894 plist = ecformats_default;
895 plistlen = sizeof(ecformats_default);
898 if ((lenmax = limit - ret - 5) < 0) return NULL;
899 if (plistlen > (size_t)lenmax) return NULL;
902 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
906 s2n(TLSEXT_TYPE_ec_point_formats,ret);
907 s2n(plistlen + 1,ret);
908 *(ret++) = (unsigned char)plistlen ;
909 memcpy(ret, plist, plistlen);
912 /* Add TLS extension EllipticCurves to the ClientHello message */
913 plist = s->tlsext_ellipticcurvelist;
914 tls1_get_curvelist(s, 0, &plist, &plistlen);
916 if ((lenmax = limit - ret - 6) < 0) return NULL;
917 if (plistlen > (size_t)lenmax) return NULL;
918 if (plistlen > 65532)
920 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
924 s2n(TLSEXT_TYPE_elliptic_curves,ret);
925 s2n(plistlen + 2, ret);
927 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
928 * elliptic_curve_list, but the examples use two bytes.
929 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
930 * resolves this to two bytes.
933 memcpy(ret, plist, plistlen);
936 #endif /* OPENSSL_NO_EC */
938 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
941 if (!s->new_session && s->session && s->session->tlsext_tick)
942 ticklen = s->session->tlsext_ticklen;
943 else if (s->session && s->tlsext_session_ticket &&
944 s->tlsext_session_ticket->data)
946 ticklen = s->tlsext_session_ticket->length;
947 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
948 if (!s->session->tlsext_tick)
950 memcpy(s->session->tlsext_tick,
951 s->tlsext_session_ticket->data,
953 s->session->tlsext_ticklen = ticklen;
957 if (ticklen == 0 && s->tlsext_session_ticket &&
958 s->tlsext_session_ticket->data == NULL)
960 /* Check for enough room 2 for extension type, 2 for len
963 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
964 s2n(TLSEXT_TYPE_session_ticket,ret);
968 memcpy(ret, s->session->tlsext_tick, ticklen);
974 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
977 const unsigned char *salg;
978 salglen = tls12_get_psigalgs(s, &salg);
979 if ((size_t)(limit - ret) < salglen + 6)
981 s2n(TLSEXT_TYPE_signature_algorithms,ret);
982 s2n(salglen + 2, ret);
984 memcpy(ret, salg, salglen);
988 #ifdef TLSEXT_TYPE_opaque_prf_input
989 if (s->s3->client_opaque_prf_input != NULL &&
990 s->version != DTLS1_VERSION)
992 size_t col = s->s3->client_opaque_prf_input_len;
994 if ((long)(limit - ret - 6 - col < 0))
996 if (col > 0xFFFD) /* can't happen */
999 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1002 memcpy(ret, s->s3->client_opaque_prf_input, col);
1007 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
1008 s->version != DTLS1_VERSION)
1011 long extlen, idlen, itmp;
1015 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1017 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1018 itmp = i2d_OCSP_RESPID(id, NULL);
1024 if (s->tlsext_ocsp_exts)
1026 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1033 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1034 s2n(TLSEXT_TYPE_status_request, ret);
1035 if (extlen + idlen > 0xFFF0)
1037 s2n(extlen + idlen + 5, ret);
1038 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1040 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1042 /* save position of id len */
1043 unsigned char *q = ret;
1044 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1045 /* skip over id len */
1047 itmp = i2d_OCSP_RESPID(id, &ret);
1053 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1056 #ifndef OPENSSL_NO_HEARTBEATS
1057 /* Add Heartbeat extension */
1058 s2n(TLSEXT_TYPE_heartbeat,ret);
1061 * 1: peer may send requests
1062 * 2: peer not allowed to send requests
1064 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1065 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1067 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1070 #ifndef OPENSSL_NO_NEXTPROTONEG
1071 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1073 /* The client advertises an emtpy extension to indicate its
1074 * support for Next Protocol Negotiation */
1075 if (limit - ret - 4 < 0)
1077 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1082 if(SSL_get_srtp_profiles(s))
1086 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1088 if((limit - p - 4 - el) < 0) return NULL;
1090 s2n(TLSEXT_TYPE_use_srtp,ret);
1093 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1095 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1101 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1102 /* 2 bytes for extension type */
1103 /* 2 bytes for extension length */
1104 /* 1 byte for the list length */
1105 /* 1 byte for the list (we only support audit proofs) */
1106 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1109 const unsigned short ext_len = 2;
1110 const unsigned char list_len = 1;
1112 if ((lenmax = limit - ret - 6) < 0) return NULL;
1114 s2n(TLSEXT_TYPE_server_authz, ret);
1115 /* Extension length: 2 bytes */
1117 *(ret++) = list_len;
1118 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1121 if ((extdatalen = ret-p-2) == 0)
1128 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1131 unsigned char *ret = p;
1132 #ifndef OPENSSL_NO_NEXTPROTONEG
1133 int next_proto_neg_seen;
1136 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1137 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1141 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1143 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1145 if ((long)(limit - ret - 4) < 0) return NULL;
1147 s2n(TLSEXT_TYPE_server_name,ret);
1151 if(s->s3->send_connection_binding)
1155 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1157 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1161 if((limit - p - 4 - el) < 0) return NULL;
1163 s2n(TLSEXT_TYPE_renegotiate,ret);
1166 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1168 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1175 #ifndef OPENSSL_NO_EC
1176 if (s->tlsext_ecpointformatlist != NULL &&
1177 s->version != DTLS1_VERSION)
1179 /* Add TLS extension ECPointFormats to the ServerHello message */
1182 if ((lenmax = limit - ret - 5) < 0) return NULL;
1183 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1184 if (s->tlsext_ecpointformatlist_length > 255)
1186 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1190 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1191 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1192 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1193 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1194 ret+=s->tlsext_ecpointformatlist_length;
1197 /* Currently the server should not respond with a SupportedCurves extension */
1198 #endif /* OPENSSL_NO_EC */
1200 if (s->tlsext_ticket_expected
1201 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1203 if ((long)(limit - ret - 4) < 0) return NULL;
1204 s2n(TLSEXT_TYPE_session_ticket,ret);
1208 if (s->tlsext_status_expected)
1210 if ((long)(limit - ret - 4) < 0) return NULL;
1211 s2n(TLSEXT_TYPE_status_request,ret);
1215 #ifdef TLSEXT_TYPE_opaque_prf_input
1216 if (s->s3->server_opaque_prf_input != NULL &&
1217 s->version != DTLS1_VERSION)
1219 size_t sol = s->s3->server_opaque_prf_input_len;
1221 if ((long)(limit - ret - 6 - sol) < 0)
1223 if (sol > 0xFFFD) /* can't happen */
1226 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1229 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1238 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1240 if((limit - p - 4 - el) < 0) return NULL;
1242 s2n(TLSEXT_TYPE_use_srtp,ret);
1245 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1247 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1253 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1254 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1255 { const unsigned char cryptopro_ext[36] = {
1256 0xfd, 0xe8, /*65000*/
1257 0x00, 0x20, /*32 bytes length*/
1258 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1259 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1260 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1261 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1262 if (limit-ret<36) return NULL;
1263 memcpy(ret,cryptopro_ext,36);
1268 #ifndef OPENSSL_NO_HEARTBEATS
1269 /* Add Heartbeat extension if we've received one */
1270 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1272 s2n(TLSEXT_TYPE_heartbeat,ret);
1275 * 1: peer may send requests
1276 * 2: peer not allowed to send requests
1278 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1279 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1281 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1286 #ifndef OPENSSL_NO_NEXTPROTONEG
1287 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1288 s->s3->next_proto_neg_seen = 0;
1289 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1291 const unsigned char *npa;
1292 unsigned int npalen;
1295 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1296 if (r == SSL_TLSEXT_ERR_OK)
1298 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1299 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1301 memcpy(ret, npa, npalen);
1303 s->s3->next_proto_neg_seen = 1;
1308 /* If the client supports authz then see whether we have any to offer
1310 if (s->s3->tlsext_authz_client_types_len)
1312 size_t authz_length;
1313 /* By now we already know the new cipher, so we can look ahead
1314 * to see whether the cert we are going to send
1315 * has any authz data attached to it. */
1316 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1317 const unsigned char* const orig_authz = authz;
1319 unsigned authz_count = 0;
1321 /* The authz data contains a number of the following structures:
1322 * uint8_t authz_type
1324 * uint8_t data[length]
1326 * First we walk over it to find the number of authz elements. */
1327 for (i = 0; i < authz_length; i++)
1329 unsigned short length;
1333 if (memchr(s->s3->tlsext_authz_client_types,
1335 s->s3->tlsext_authz_client_types_len) != NULL)
1339 /* n2s increments authz by 2 */
1347 /* Add TLS extension server_authz to the ServerHello message
1348 * 2 bytes for extension type
1349 * 2 bytes for extension length
1350 * 1 byte for the list length
1351 * n bytes for the list */
1352 const unsigned short ext_len = 1 + authz_count;
1354 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1355 s2n(TLSEXT_TYPE_server_authz, ret);
1357 *(ret++) = authz_count;
1358 s->s3->tlsext_authz_promised_to_client = 1;
1362 for (i = 0; i < authz_length; i++)
1364 unsigned short length;
1369 if (memchr(s->s3->tlsext_authz_client_types,
1371 s->s3->tlsext_authz_client_types_len) != NULL)
1374 /* n2s increments authz by 2 */
1381 if ((extdatalen = ret-p-2)== 0)
1388 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1390 unsigned short type;
1391 unsigned short size;
1393 unsigned char *data = *p;
1394 int renegotiate_seen = 0;
1396 s->servername_done = 0;
1397 s->tlsext_status_type = -1;
1398 #ifndef OPENSSL_NO_NEXTPROTONEG
1399 s->s3->next_proto_neg_seen = 0;
1402 #ifndef OPENSSL_NO_HEARTBEATS
1403 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1404 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1406 /* Clear any signature algorithms extension received */
1407 if (s->cert->peer_sigalgs)
1409 OPENSSL_free(s->cert->peer_sigalgs);
1410 s->cert->peer_sigalgs = NULL;
1412 /* Clear any shared sigtnature algorithms */
1413 if (s->cert->shared_sigalgs)
1415 OPENSSL_free(s->cert->shared_sigalgs);
1416 s->cert->shared_sigalgs = NULL;
1419 if (data >= (d+n-2))
1423 if (data > (d+n-len))
1426 while (data <= (d+n-4))
1431 if (data+size > (d+n))
1434 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1436 if (s->tlsext_debug_cb)
1437 s->tlsext_debug_cb(s, 0, type, data, size,
1438 s->tlsext_debug_arg);
1439 /* The servername extension is treated as follows:
1441 - Only the hostname type is supported with a maximum length of 255.
1442 - The servername is rejected if too long or if it contains zeros,
1443 in which case an fatal alert is generated.
1444 - The servername field is maintained together with the session cache.
1445 - When a session is resumed, the servername call back invoked in order
1446 to allow the application to position itself to the right context.
1447 - The servername is acknowledged if it is new for a session or when
1448 it is identical to a previously used for the same session.
1449 Applications can control the behaviour. They can at any time
1450 set a 'desirable' servername for a new SSL object. This can be the
1451 case for example with HTTPS when a Host: header field is received and
1452 a renegotiation is requested. In this case, a possible servername
1453 presented in the new client hello is only acknowledged if it matches
1454 the value of the Host: field.
1455 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1456 if they provide for changing an explicit servername context for the session,
1457 i.e. when the session has been established with a servername extension.
1458 - On session reconnect, the servername extension may be absent.
1462 if (type == TLSEXT_TYPE_server_name)
1464 unsigned char *sdata;
1470 *al = SSL_AD_DECODE_ERROR;
1477 *al = SSL_AD_DECODE_ERROR;
1484 servname_type = *(sdata++);
1490 *al = SSL_AD_DECODE_ERROR;
1493 if (s->servername_done == 0)
1494 switch (servname_type)
1496 case TLSEXT_NAMETYPE_host_name:
1499 if(s->session->tlsext_hostname)
1501 *al = SSL_AD_DECODE_ERROR;
1504 if (len > TLSEXT_MAXLEN_host_name)
1506 *al = TLS1_AD_UNRECOGNIZED_NAME;
1509 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1511 *al = TLS1_AD_INTERNAL_ERROR;
1514 memcpy(s->session->tlsext_hostname, sdata, len);
1515 s->session->tlsext_hostname[len]='\0';
1516 if (strlen(s->session->tlsext_hostname) != len) {
1517 OPENSSL_free(s->session->tlsext_hostname);
1518 s->session->tlsext_hostname = NULL;
1519 *al = TLS1_AD_UNRECOGNIZED_NAME;
1522 s->servername_done = 1;
1526 s->servername_done = s->session->tlsext_hostname
1527 && strlen(s->session->tlsext_hostname) == len
1528 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1540 *al = SSL_AD_DECODE_ERROR;
1545 #ifndef OPENSSL_NO_SRP
1546 else if (type == TLSEXT_TYPE_srp)
1548 if (size <= 0 || ((len = data[0])) != (size -1))
1550 *al = SSL_AD_DECODE_ERROR;
1553 if (s->srp_ctx.login != NULL)
1555 *al = SSL_AD_DECODE_ERROR;
1558 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1560 memcpy(s->srp_ctx.login, &data[1], len);
1561 s->srp_ctx.login[len]='\0';
1563 if (strlen(s->srp_ctx.login) != len)
1565 *al = SSL_AD_DECODE_ERROR;
1571 #ifndef OPENSSL_NO_EC
1572 else if (type == TLSEXT_TYPE_ec_point_formats &&
1573 s->version != DTLS1_VERSION)
1575 unsigned char *sdata = data;
1576 int ecpointformatlist_length = *(sdata++);
1578 if (ecpointformatlist_length != size - 1)
1580 *al = TLS1_AD_DECODE_ERROR;
1585 if(s->session->tlsext_ecpointformatlist)
1587 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1588 s->session->tlsext_ecpointformatlist = NULL;
1590 s->session->tlsext_ecpointformatlist_length = 0;
1591 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1593 *al = TLS1_AD_INTERNAL_ERROR;
1596 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1597 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1600 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1601 sdata = s->session->tlsext_ecpointformatlist;
1602 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1603 fprintf(stderr,"%i ",*(sdata++));
1604 fprintf(stderr,"\n");
1607 else if (type == TLSEXT_TYPE_elliptic_curves &&
1608 s->version != DTLS1_VERSION)
1610 unsigned char *sdata = data;
1611 int ellipticcurvelist_length = (*(sdata++) << 8);
1612 ellipticcurvelist_length += (*(sdata++));
1614 if (ellipticcurvelist_length != size - 2)
1616 *al = TLS1_AD_DECODE_ERROR;
1621 if(s->session->tlsext_ellipticcurvelist)
1623 *al = TLS1_AD_DECODE_ERROR;
1626 s->session->tlsext_ellipticcurvelist_length = 0;
1627 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1629 *al = TLS1_AD_INTERNAL_ERROR;
1632 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1633 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1636 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1637 sdata = s->session->tlsext_ellipticcurvelist;
1638 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1639 fprintf(stderr,"%i ",*(sdata++));
1640 fprintf(stderr,"\n");
1643 #endif /* OPENSSL_NO_EC */
1644 #ifdef TLSEXT_TYPE_opaque_prf_input
1645 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1646 s->version != DTLS1_VERSION)
1648 unsigned char *sdata = data;
1652 *al = SSL_AD_DECODE_ERROR;
1655 n2s(sdata, s->s3->client_opaque_prf_input_len);
1656 if (s->s3->client_opaque_prf_input_len != size - 2)
1658 *al = SSL_AD_DECODE_ERROR;
1662 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1663 OPENSSL_free(s->s3->client_opaque_prf_input);
1664 if (s->s3->client_opaque_prf_input_len == 0)
1665 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1667 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1668 if (s->s3->client_opaque_prf_input == NULL)
1670 *al = TLS1_AD_INTERNAL_ERROR;
1675 else if (type == TLSEXT_TYPE_session_ticket)
1677 if (s->tls_session_ticket_ext_cb &&
1678 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1680 *al = TLS1_AD_INTERNAL_ERROR;
1684 else if (type == TLSEXT_TYPE_renegotiate)
1686 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1688 renegotiate_seen = 1;
1690 else if (type == TLSEXT_TYPE_signature_algorithms)
1693 if (s->cert->peer_sigalgs || size < 2)
1695 *al = SSL_AD_DECODE_ERROR;
1700 if (dsize != size || dsize & 1 || !dsize)
1702 *al = SSL_AD_DECODE_ERROR;
1705 if (!tls1_process_sigalgs(s, data, dsize))
1707 *al = SSL_AD_DECODE_ERROR;
1710 /* If sigalgs received and no shared algorithms fatal
1713 if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
1715 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1716 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
1717 *al = SSL_AD_ILLEGAL_PARAMETER;
1721 else if (type == TLSEXT_TYPE_status_request &&
1722 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1727 *al = SSL_AD_DECODE_ERROR;
1731 s->tlsext_status_type = *data++;
1733 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1735 const unsigned char *sdata;
1737 /* Read in responder_id_list */
1742 *al = SSL_AD_DECODE_ERROR;
1751 *al = SSL_AD_DECODE_ERROR;
1755 dsize -= 2 + idsize;
1759 *al = SSL_AD_DECODE_ERROR;
1764 id = d2i_OCSP_RESPID(NULL,
1768 *al = SSL_AD_DECODE_ERROR;
1773 OCSP_RESPID_free(id);
1774 *al = SSL_AD_DECODE_ERROR;
1777 if (!s->tlsext_ocsp_ids
1778 && !(s->tlsext_ocsp_ids =
1779 sk_OCSP_RESPID_new_null()))
1781 OCSP_RESPID_free(id);
1782 *al = SSL_AD_INTERNAL_ERROR;
1785 if (!sk_OCSP_RESPID_push(
1786 s->tlsext_ocsp_ids, id))
1788 OCSP_RESPID_free(id);
1789 *al = SSL_AD_INTERNAL_ERROR;
1794 /* Read in request_extensions */
1797 *al = SSL_AD_DECODE_ERROR;
1804 *al = SSL_AD_DECODE_ERROR;
1810 if (s->tlsext_ocsp_exts)
1812 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1813 X509_EXTENSION_free);
1816 s->tlsext_ocsp_exts =
1817 d2i_X509_EXTENSIONS(NULL,
1819 if (!s->tlsext_ocsp_exts
1820 || (data + dsize != sdata))
1822 *al = SSL_AD_DECODE_ERROR;
1827 /* We don't know what to do with any other type
1831 s->tlsext_status_type = -1;
1833 #ifndef OPENSSL_NO_HEARTBEATS
1834 else if (type == TLSEXT_TYPE_heartbeat)
1838 case 0x01: /* Client allows us to send HB requests */
1839 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1841 case 0x02: /* Client doesn't accept HB requests */
1842 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1843 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1845 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1850 #ifndef OPENSSL_NO_NEXTPROTONEG
1851 else if (type == TLSEXT_TYPE_next_proto_neg &&
1852 s->s3->tmp.finish_md_len == 0)
1854 /* We shouldn't accept this extension on a
1857 * s->new_session will be set on renegotiation, but we
1858 * probably shouldn't rely that it couldn't be set on
1859 * the initial renegotation too in certain cases (when
1860 * there's some other reason to disallow resuming an
1861 * earlier session -- the current code won't be doing
1862 * anything like that, but this might change).
1864 * A valid sign that there's been a previous handshake
1865 * in this connection is if s->s3->tmp.finish_md_len >
1866 * 0. (We are talking about a check that will happen
1867 * in the Hello protocol round, well before a new
1868 * Finished message could have been computed.) */
1869 s->s3->next_proto_neg_seen = 1;
1873 /* session ticket processed earlier */
1874 else if (type == TLSEXT_TYPE_use_srtp)
1876 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1881 else if (type == TLSEXT_TYPE_server_authz)
1883 unsigned char *sdata = data;
1884 unsigned char server_authz_dataformatlist_length;
1888 *al = TLS1_AD_DECODE_ERROR;
1892 server_authz_dataformatlist_length = *(sdata++);
1894 if (server_authz_dataformatlist_length != size - 1)
1896 *al = TLS1_AD_DECODE_ERROR;
1900 /* Successful session resumption uses the same authz
1901 * information as the original session so we ignore this
1902 * in the case of a session resumption. */
1906 if (s->s3->tlsext_authz_client_types != NULL)
1907 OPENSSL_free(s->s3->tlsext_authz_client_types);
1908 s->s3->tlsext_authz_client_types =
1909 OPENSSL_malloc(server_authz_dataformatlist_length);
1910 if (!s->s3->tlsext_authz_client_types)
1912 *al = TLS1_AD_INTERNAL_ERROR;
1916 s->s3->tlsext_authz_client_types_len =
1917 server_authz_dataformatlist_length;
1918 memcpy(s->s3->tlsext_authz_client_types,
1920 server_authz_dataformatlist_length);
1922 /* Sort the types in order to check for duplicates. */
1923 qsort(s->s3->tlsext_authz_client_types,
1924 server_authz_dataformatlist_length,
1925 1 /* element size */,
1928 for (i = 0; i < server_authz_dataformatlist_length; i++)
1931 s->s3->tlsext_authz_client_types[i] ==
1932 s->s3->tlsext_authz_client_types[i-1])
1934 *al = TLS1_AD_DECODE_ERROR;
1948 /* Need RI if renegotiating */
1950 if (!renegotiate_seen && s->renegotiate &&
1951 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1953 *al = SSL_AD_HANDSHAKE_FAILURE;
1954 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1955 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1958 /* If no signature algorithms extension set default values */
1959 if (!s->cert->peer_sigalgs)
1960 ssl_cert_set_default_md(s->cert);
1965 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1968 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1970 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1974 if (ssl_check_clienthello_tlsext(s) <= 0)
1976 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1982 #ifndef OPENSSL_NO_NEXTPROTONEG
1983 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1984 * elements of zero length are allowed and the set of elements must exactly fill
1985 * the length of the block. */
1986 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1988 unsigned int off = 0;
2002 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2004 unsigned short length;
2005 unsigned short type;
2006 unsigned short size;
2007 unsigned char *data = *p;
2008 int tlsext_servername = 0;
2009 int renegotiate_seen = 0;
2011 #ifndef OPENSSL_NO_NEXTPROTONEG
2012 s->s3->next_proto_neg_seen = 0;
2015 #ifndef OPENSSL_NO_HEARTBEATS
2016 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2017 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2020 if (data >= (d+n-2))
2024 if (data+length != d+n)
2026 *al = SSL_AD_DECODE_ERROR;
2030 while(data <= (d+n-4))
2035 if (data+size > (d+n))
2038 if (s->tlsext_debug_cb)
2039 s->tlsext_debug_cb(s, 1, type, data, size,
2040 s->tlsext_debug_arg);
2042 if (type == TLSEXT_TYPE_server_name)
2044 if (s->tlsext_hostname == NULL || size > 0)
2046 *al = TLS1_AD_UNRECOGNIZED_NAME;
2049 tlsext_servername = 1;
2052 #ifndef OPENSSL_NO_EC
2053 else if (type == TLSEXT_TYPE_ec_point_formats &&
2054 s->version != DTLS1_VERSION)
2056 unsigned char *sdata = data;
2057 int ecpointformatlist_length = *(sdata++);
2059 if (ecpointformatlist_length != size - 1)
2061 *al = TLS1_AD_DECODE_ERROR;
2064 s->session->tlsext_ecpointformatlist_length = 0;
2065 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2066 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2068 *al = TLS1_AD_INTERNAL_ERROR;
2071 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2072 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2074 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2075 sdata = s->session->tlsext_ecpointformatlist;
2076 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2077 fprintf(stderr,"%i ",*(sdata++));
2078 fprintf(stderr,"\n");
2081 #endif /* OPENSSL_NO_EC */
2083 else if (type == TLSEXT_TYPE_session_ticket)
2085 if (s->tls_session_ticket_ext_cb &&
2086 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2088 *al = TLS1_AD_INTERNAL_ERROR;
2091 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2094 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2097 s->tlsext_ticket_expected = 1;
2099 #ifdef TLSEXT_TYPE_opaque_prf_input
2100 else if (type == TLSEXT_TYPE_opaque_prf_input &&
2101 s->version != DTLS1_VERSION)
2103 unsigned char *sdata = data;
2107 *al = SSL_AD_DECODE_ERROR;
2110 n2s(sdata, s->s3->server_opaque_prf_input_len);
2111 if (s->s3->server_opaque_prf_input_len != size - 2)
2113 *al = SSL_AD_DECODE_ERROR;
2117 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2118 OPENSSL_free(s->s3->server_opaque_prf_input);
2119 if (s->s3->server_opaque_prf_input_len == 0)
2120 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2122 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2124 if (s->s3->server_opaque_prf_input == NULL)
2126 *al = TLS1_AD_INTERNAL_ERROR;
2131 else if (type == TLSEXT_TYPE_status_request &&
2132 s->version != DTLS1_VERSION)
2134 /* MUST be empty and only sent if we've requested
2135 * a status request message.
2137 if ((s->tlsext_status_type == -1) || (size > 0))
2139 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2142 /* Set flag to expect CertificateStatus message */
2143 s->tlsext_status_expected = 1;
2145 #ifndef OPENSSL_NO_NEXTPROTONEG
2146 else if (type == TLSEXT_TYPE_next_proto_neg &&
2147 s->s3->tmp.finish_md_len == 0)
2149 unsigned char *selected;
2150 unsigned char selected_len;
2152 /* We must have requested it. */
2153 if ((s->ctx->next_proto_select_cb == NULL))
2155 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2158 /* The data must be valid */
2159 if (!ssl_next_proto_validate(data, size))
2161 *al = TLS1_AD_DECODE_ERROR;
2164 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2166 *al = TLS1_AD_INTERNAL_ERROR;
2169 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2170 if (!s->next_proto_negotiated)
2172 *al = TLS1_AD_INTERNAL_ERROR;
2175 memcpy(s->next_proto_negotiated, selected, selected_len);
2176 s->next_proto_negotiated_len = selected_len;
2177 s->s3->next_proto_neg_seen = 1;
2180 else if (type == TLSEXT_TYPE_renegotiate)
2182 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2184 renegotiate_seen = 1;
2186 #ifndef OPENSSL_NO_HEARTBEATS
2187 else if (type == TLSEXT_TYPE_heartbeat)
2191 case 0x01: /* Server allows us to send HB requests */
2192 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2194 case 0x02: /* Server doesn't accept HB requests */
2195 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2196 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2198 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2203 else if (type == TLSEXT_TYPE_use_srtp)
2205 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2210 else if (type == TLSEXT_TYPE_server_authz)
2212 /* We only support audit proofs. It's an error to send
2213 * an authz hello extension if the client
2214 * didn't request a proof. */
2215 unsigned char *sdata = data;
2216 unsigned char server_authz_dataformatlist_length;
2218 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2220 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2226 *al = TLS1_AD_DECODE_ERROR;
2230 server_authz_dataformatlist_length = *(sdata++);
2231 if (server_authz_dataformatlist_length != size - 1)
2233 *al = TLS1_AD_DECODE_ERROR;
2237 /* We only support audit proofs, so a legal ServerHello
2238 * authz list contains exactly one entry. */
2239 if (server_authz_dataformatlist_length != 1 ||
2240 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2242 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2246 s->s3->tlsext_authz_server_promised = 1;
2254 *al = SSL_AD_DECODE_ERROR;
2258 if (!s->hit && tlsext_servername == 1)
2260 if (s->tlsext_hostname)
2262 if (s->session->tlsext_hostname == NULL)
2264 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2265 if (!s->session->tlsext_hostname)
2267 *al = SSL_AD_UNRECOGNIZED_NAME;
2273 *al = SSL_AD_DECODE_ERROR;
2283 /* Determine if we need to see RI. Strictly speaking if we want to
2284 * avoid an attack we should *always* see RI even on initial server
2285 * hello because the client doesn't see any renegotiation during an
2286 * attack. However this would mean we could not connect to any server
2287 * which doesn't support RI so for the immediate future tolerate RI
2288 * absence on initial connect only.
2290 if (!renegotiate_seen
2291 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2292 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2294 *al = SSL_AD_HANDSHAKE_FAILURE;
2295 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2296 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2304 int ssl_prepare_clienthello_tlsext(SSL *s)
2307 #ifdef TLSEXT_TYPE_opaque_prf_input
2311 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2313 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2318 if (s->tlsext_opaque_prf_input != NULL)
2320 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2321 OPENSSL_free(s->s3->client_opaque_prf_input);
2323 if (s->tlsext_opaque_prf_input_len == 0)
2324 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2326 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2327 if (s->s3->client_opaque_prf_input == NULL)
2329 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2332 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2336 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2337 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2344 int ssl_prepare_serverhello_tlsext(SSL *s)
2346 #ifndef OPENSSL_NO_EC
2347 /* If we are server and using an ECC cipher suite, send the point formats we support
2348 * if the client sent us an ECPointsFormat extension. Note that the server is not
2349 * supposed to send an EllipticCurves extension.
2352 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2353 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2354 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2355 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2359 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2360 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2362 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2365 s->tlsext_ecpointformatlist_length = 3;
2366 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2367 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2368 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2370 #endif /* OPENSSL_NO_EC */
2375 static int ssl_check_clienthello_tlsext(SSL *s)
2377 int ret=SSL_TLSEXT_ERR_NOACK;
2378 int al = SSL_AD_UNRECOGNIZED_NAME;
2380 #ifndef OPENSSL_NO_EC
2381 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2382 * ssl3_choose_cipher in s3_lib.c.
2384 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2385 * ssl3_choose_cipher in s3_lib.c.
2389 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2390 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2391 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2392 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2394 /* If status request then ask callback what to do.
2395 * Note: this must be called after servername callbacks in case
2396 * the certificate has changed.
2398 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2401 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2404 /* We don't want to send a status request response */
2405 case SSL_TLSEXT_ERR_NOACK:
2406 s->tlsext_status_expected = 0;
2408 /* status request response should be sent */
2409 case SSL_TLSEXT_ERR_OK:
2410 if (s->tlsext_ocsp_resp)
2411 s->tlsext_status_expected = 1;
2413 s->tlsext_status_expected = 0;
2415 /* something bad happened */
2416 case SSL_TLSEXT_ERR_ALERT_FATAL:
2417 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2418 al = SSL_AD_INTERNAL_ERROR;
2423 s->tlsext_status_expected = 0;
2425 #ifdef TLSEXT_TYPE_opaque_prf_input
2427 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2428 * but we might be sending an alert in response to the client hello,
2429 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2433 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2435 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2438 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2439 al = SSL_AD_INTERNAL_ERROR;
2444 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2445 OPENSSL_free(s->s3->server_opaque_prf_input);
2446 s->s3->server_opaque_prf_input = NULL;
2448 if (s->tlsext_opaque_prf_input != NULL)
2450 if (s->s3->client_opaque_prf_input != NULL &&
2451 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2453 /* can only use this extension if we have a server opaque PRF input
2454 * of the same length as the client opaque PRF input! */
2456 if (s->tlsext_opaque_prf_input_len == 0)
2457 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2459 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2460 if (s->s3->server_opaque_prf_input == NULL)
2462 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2463 al = SSL_AD_INTERNAL_ERROR;
2466 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2470 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2472 /* The callback wants to enforce use of the extension,
2473 * but we can't do that with the client opaque PRF input;
2474 * abort the handshake.
2476 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2477 al = SSL_AD_HANDSHAKE_FAILURE;
2485 case SSL_TLSEXT_ERR_ALERT_FATAL:
2486 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2489 case SSL_TLSEXT_ERR_ALERT_WARNING:
2490 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2493 case SSL_TLSEXT_ERR_NOACK:
2494 s->servername_done=0;
2500 int ssl_check_serverhello_tlsext(SSL *s)
2502 int ret=SSL_TLSEXT_ERR_NOACK;
2503 int al = SSL_AD_UNRECOGNIZED_NAME;
2505 #ifndef OPENSSL_NO_EC
2506 /* If we are client and using an elliptic curve cryptography cipher
2507 * suite, then if server returns an EC point formats lists extension
2508 * it must contain uncompressed.
2510 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2511 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2512 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2513 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2514 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2516 /* we are using an ECC cipher */
2518 unsigned char *list;
2519 int found_uncompressed = 0;
2520 list = s->session->tlsext_ecpointformatlist;
2521 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2523 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2525 found_uncompressed = 1;
2529 if (!found_uncompressed)
2531 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2535 ret = SSL_TLSEXT_ERR_OK;
2536 #endif /* OPENSSL_NO_EC */
2538 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2539 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2540 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2541 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2543 #ifdef TLSEXT_TYPE_opaque_prf_input
2544 if (s->s3->server_opaque_prf_input_len > 0)
2546 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2547 * So first verify that we really have a value from the server too. */
2549 if (s->s3->server_opaque_prf_input == NULL)
2551 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2552 al = SSL_AD_HANDSHAKE_FAILURE;
2555 /* Anytime the server *has* sent an opaque PRF input, we need to check
2556 * that we have a client opaque PRF input of the same size. */
2557 if (s->s3->client_opaque_prf_input == NULL ||
2558 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2560 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2561 al = SSL_AD_ILLEGAL_PARAMETER;
2566 /* If we've requested certificate status and we wont get one
2569 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2570 && s->ctx && s->ctx->tlsext_status_cb)
2573 /* Set resp to NULL, resplen to -1 so callback knows
2574 * there is no response.
2576 if (s->tlsext_ocsp_resp)
2578 OPENSSL_free(s->tlsext_ocsp_resp);
2579 s->tlsext_ocsp_resp = NULL;
2581 s->tlsext_ocsp_resplen = -1;
2582 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2585 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2586 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2590 al = SSL_AD_INTERNAL_ERROR;
2591 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2597 case SSL_TLSEXT_ERR_ALERT_FATAL:
2598 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2601 case SSL_TLSEXT_ERR_ALERT_WARNING:
2602 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2605 case SSL_TLSEXT_ERR_NOACK:
2606 s->servername_done=0;
2612 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2615 if (s->version < SSL3_VERSION)
2617 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2619 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2623 if (ssl_check_serverhello_tlsext(s) <= 0)
2625 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2631 /* Since the server cache lookup is done early on in the processing of the
2632 * ClientHello, and other operations depend on the result, we need to handle
2633 * any TLS session ticket extension at the same time.
2635 * session_id: points at the session ID in the ClientHello. This code will
2636 * read past the end of this in order to parse out the session ticket
2637 * extension, if any.
2638 * len: the length of the session ID.
2639 * limit: a pointer to the first byte after the ClientHello.
2640 * ret: (output) on return, if a ticket was decrypted, then this is set to
2641 * point to the resulting session.
2643 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2644 * ciphersuite, in which case we have no use for session tickets and one will
2645 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2648 * -1: fatal error, either from parsing or decrypting the ticket.
2649 * 0: no ticket was found (or was ignored, based on settings).
2650 * 1: a zero length extension was found, indicating that the client supports
2651 * session tickets but doesn't currently have one to offer.
2652 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2653 * couldn't be decrypted because of a non-fatal error.
2654 * 3: a ticket was successfully decrypted and *ret was set.
2657 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2658 * a new session ticket to the client because the client indicated support
2659 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2660 * a session ticket or we couldn't use the one it gave us, or if
2661 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2662 * Otherwise, s->tlsext_ticket_expected is set to 0.
2664 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2665 const unsigned char *limit, SSL_SESSION **ret)
2667 /* Point after session ID in client hello */
2668 const unsigned char *p = session_id + len;
2672 s->tlsext_ticket_expected = 0;
2674 /* If tickets disabled behave as if no ticket present
2675 * to permit stateful resumption.
2677 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2679 if ((s->version <= SSL3_VERSION) || !limit)
2683 /* Skip past DTLS cookie */
2684 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2691 /* Skip past cipher list */
2696 /* Skip past compression algorithm list */
2701 /* Now at start of extensions */
2702 if ((p + 2) >= limit)
2705 while ((p + 4) <= limit)
2707 unsigned short type, size;
2710 if (p + size > limit)
2712 if (type == TLSEXT_TYPE_session_ticket)
2717 /* The client will accept a ticket but doesn't
2718 * currently have one. */
2719 s->tlsext_ticket_expected = 1;
2722 if (s->tls_session_secret_cb)
2724 /* Indicate that the ticket couldn't be
2725 * decrypted rather than generating the session
2726 * from ticket now, trigger abbreviated
2727 * handshake based on external mechanism to
2728 * calculate the master secret later. */
2731 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2734 case 2: /* ticket couldn't be decrypted */
2735 s->tlsext_ticket_expected = 1;
2737 case 3: /* ticket was decrypted */
2739 case 4: /* ticket decrypted but need to renew */
2740 s->tlsext_ticket_expected = 1;
2742 default: /* fatal error */
2751 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2753 * etick: points to the body of the session ticket extension.
2754 * eticklen: the length of the session tickets extenion.
2755 * sess_id: points at the session ID.
2756 * sesslen: the length of the session ID.
2757 * psess: (output) on return, if a ticket was decrypted, then this is set to
2758 * point to the resulting session.
2761 * -1: fatal error, either from parsing or decrypting the ticket.
2762 * 2: the ticket couldn't be decrypted.
2763 * 3: a ticket was successfully decrypted and *psess was set.
2764 * 4: same as 3, but the ticket needs to be renewed.
2766 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2767 const unsigned char *sess_id, int sesslen,
2768 SSL_SESSION **psess)
2771 unsigned char *sdec;
2772 const unsigned char *p;
2773 int slen, mlen, renew_ticket = 0;
2774 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2777 SSL_CTX *tctx = s->initial_ctx;
2778 /* Need at least keyname + iv + some encrypted data */
2781 /* Initialize session ticket encryption and HMAC contexts */
2782 HMAC_CTX_init(&hctx);
2783 EVP_CIPHER_CTX_init(&ctx);
2784 if (tctx->tlsext_ticket_key_cb)
2786 unsigned char *nctick = (unsigned char *)etick;
2787 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2798 /* Check key name matches */
2799 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2801 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2802 tlsext_tick_md(), NULL);
2803 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2804 tctx->tlsext_tick_aes_key, etick + 16);
2806 /* Attempt to process session ticket, first conduct sanity and
2807 * integrity checks on ticket.
2809 mlen = HMAC_size(&hctx);
2812 EVP_CIPHER_CTX_cleanup(&ctx);
2816 /* Check HMAC of encrypted ticket */
2817 HMAC_Update(&hctx, etick, eticklen);
2818 HMAC_Final(&hctx, tick_hmac, NULL);
2819 HMAC_CTX_cleanup(&hctx);
2820 if (memcmp(tick_hmac, etick + eticklen, mlen))
2822 /* Attempt to decrypt session data */
2823 /* Move p after IV to start of encrypted ticket, update length */
2824 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2825 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2826 sdec = OPENSSL_malloc(eticklen);
2829 EVP_CIPHER_CTX_cleanup(&ctx);
2832 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2833 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2836 EVP_CIPHER_CTX_cleanup(&ctx);
2839 sess = d2i_SSL_SESSION(NULL, &p, slen);
2843 /* The session ID, if non-empty, is used by some clients to
2844 * detect that the ticket has been accepted. So we copy it to
2845 * the session structure. If it is empty set length to zero
2846 * as required by standard.
2849 memcpy(sess->session_id, sess_id, sesslen);
2850 sess->session_id_length = sesslen;
2858 /* For session parse failure, indicate that we need to send a new
2863 /* Tables to translate from NIDs to TLS v1.2 ids */
2871 static tls12_lookup tls12_md[] = {
2872 {NID_md5, TLSEXT_hash_md5},
2873 {NID_sha1, TLSEXT_hash_sha1},
2874 {NID_sha224, TLSEXT_hash_sha224},
2875 {NID_sha256, TLSEXT_hash_sha256},
2876 {NID_sha384, TLSEXT_hash_sha384},
2877 {NID_sha512, TLSEXT_hash_sha512}
2880 static tls12_lookup tls12_sig[] = {
2881 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2882 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2883 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2886 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2889 for (i = 0; i < tlen; i++)
2891 if (table[i].nid == nid)
2897 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2900 for (i = 0; i < tlen; i++)
2902 if ((table[i].id) == id)
2903 return table[i].nid;
2908 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2913 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2914 sizeof(tls12_md)/sizeof(tls12_lookup));
2917 sig_id = tls12_get_sigid(pk);
2920 p[0] = (unsigned char)md_id;
2921 p[1] = (unsigned char)sig_id;
2925 int tls12_get_sigid(const EVP_PKEY *pk)
2927 return tls12_find_id(pk->type, tls12_sig,
2928 sizeof(tls12_sig)/sizeof(tls12_lookup));
2931 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2935 #ifndef OPENSSL_NO_MD5
2936 case TLSEXT_hash_md5:
2943 #ifndef OPENSSL_NO_SHA
2944 case TLSEXT_hash_sha1:
2947 #ifndef OPENSSL_NO_SHA256
2948 case TLSEXT_hash_sha224:
2949 return EVP_sha224();
2951 case TLSEXT_hash_sha256:
2952 return EVP_sha256();
2954 #ifndef OPENSSL_NO_SHA512
2955 case TLSEXT_hash_sha384:
2956 return EVP_sha384();
2958 case TLSEXT_hash_sha512:
2959 return EVP_sha512();
2967 static int tls12_get_pkey_idx(unsigned char sig_alg)
2971 #ifndef OPENSSL_NO_RSA
2972 case TLSEXT_signature_rsa:
2973 return SSL_PKEY_RSA_SIGN;
2975 #ifndef OPENSSL_NO_DSA
2976 case TLSEXT_signature_dsa:
2977 return SSL_PKEY_DSA_SIGN;
2979 #ifndef OPENSSL_NO_ECDSA
2980 case TLSEXT_signature_ecdsa:
2981 return SSL_PKEY_ECC;
2987 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
2988 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
2989 int *psignhash_nid, const unsigned char *data)
2991 int sign_nid = 0, hash_nid = 0;
2992 if (!phash_nid && !psign_nid && !psignhash_nid)
2994 if (phash_nid || psignhash_nid)
2996 hash_nid = tls12_find_nid(data[0], tls12_md,
2997 sizeof(tls12_md)/sizeof(tls12_lookup));
2999 *phash_nid = hash_nid;
3001 if (psign_nid || psignhash_nid)
3003 sign_nid = tls12_find_nid(data[1], tls12_sig,
3004 sizeof(tls12_sig)/sizeof(tls12_lookup));
3006 *psign_nid = sign_nid;
3010 if (sign_nid && hash_nid)
3011 OBJ_find_sigid_by_algs(psignhash_nid,
3012 hash_nid, sign_nid);
3014 *psignhash_nid = NID_undef;
3017 /* Given preference and allowed sigalgs set shared sigalgs */
3018 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
3019 const unsigned char *pref, size_t preflen,
3020 const unsigned char *allow, size_t allowlen)
3022 const unsigned char *ptmp, *atmp;
3023 size_t i, j, nmatch = 0;
3024 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3026 /* Skip disabled hashes or signature algorithms */
3027 if (tls12_get_hash(ptmp[0]) == NULL)
3029 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3031 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3033 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3038 shsig->rhash = ptmp[0];
3039 shsig->rsign = ptmp[1];
3040 tls1_lookup_sigalg(&shsig->hash_nid,
3042 &shsig->signandhash_nid,
3053 /* Set shared signature algorithms for SSL structures */
3054 static int tls1_set_shared_sigalgs(SSL *s)
3056 const unsigned char *pref, *allow, *conf;
3057 size_t preflen, allowlen, conflen;
3059 TLS_SIGALGS *salgs = NULL;
3061 /* If client use client signature algorithms if not NULL */
3062 if (!s->server && c->client_sigalgs)
3064 conf = c->client_sigalgs;
3065 conflen = c->client_sigalgslen;
3067 else if (c->conf_sigalgs)
3069 conf = c->conf_sigalgs;
3070 conflen = c->conf_sigalgslen;
3074 conf = tls12_sigalgs;
3075 conflen = sizeof(tls12_sigalgs);
3081 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
3085 allow = c->peer_sigalgs;
3086 allowlen = c->peer_sigalgslen;
3092 pref = c->peer_sigalgs;
3093 preflen = c->peer_sigalgslen;
3095 nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3098 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3101 nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3102 c->shared_sigalgs = salgs;
3103 c->shared_sigalgslen = nmatch;
3108 /* Set preferred digest for each key type */
3110 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3116 TLS_SIGALGS *sigptr;
3117 /* Extension ignored for TLS versions below 1.2 */
3118 if (TLS1_get_version(s) < TLS1_2_VERSION)
3120 /* Should never happen */
3124 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
3125 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
3126 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
3127 c->pkeys[SSL_PKEY_ECC].digest = NULL;
3129 c->peer_sigalgs = OPENSSL_malloc(dsize);
3130 if (!c->peer_sigalgs)
3132 c->peer_sigalgslen = dsize;
3133 memcpy(c->peer_sigalgs, data, dsize);
3135 tls1_set_shared_sigalgs(s);
3137 for (i = 0, sigptr = c->shared_sigalgs;
3138 i < c->shared_sigalgslen; i++, sigptr++)
3140 idx = tls12_get_pkey_idx(sigptr->rsign);
3141 if (idx > 0 && c->pkeys[idx].digest == NULL)
3143 md = tls12_get_hash(sigptr->rhash);
3144 c->pkeys[idx].digest = md;
3145 if (idx == SSL_PKEY_RSA_SIGN)
3146 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3150 /* In strict mode leave unset digests as NULL to indicate we can't
3151 * use the certificate for signing.
3153 if (!(s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT))
3155 /* Set any remaining keys to default values. NOTE: if alg is
3156 * not supported it stays as NULL.
3158 #ifndef OPENSSL_NO_DSA
3159 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3160 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3162 #ifndef OPENSSL_NO_RSA
3163 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3165 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3166 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3169 #ifndef OPENSSL_NO_ECDSA
3170 if (!c->pkeys[SSL_PKEY_ECC].digest)
3171 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3178 int SSL_get_sigalgs(SSL *s, int idx,
3179 int *psign, int *phash, int *psignhash,
3180 unsigned char *rsig, unsigned char *rhash)
3182 const unsigned char *psig = s->cert->peer_sigalgs;
3188 if (idx >= (int)s->cert->peer_sigalgslen)
3195 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3197 return s->cert->peer_sigalgslen / 2;
3200 int SSL_get_shared_sigalgs(SSL *s, int idx,
3201 int *psign, int *phash, int *psignhash,
3202 unsigned char *rsig, unsigned char *rhash)
3204 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3205 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3209 *phash = shsigalgs->hash_nid;
3211 *psign = shsigalgs->sign_nid;
3213 *psignhash = shsigalgs->signandhash_nid;
3215 *rsig = shsigalgs->rsign;
3217 *rhash = shsigalgs->rhash;
3218 return s->cert->shared_sigalgslen;
3222 #ifndef OPENSSL_NO_HEARTBEATS
3224 tls1_process_heartbeat(SSL *s)
3226 unsigned char *p = &s->s3->rrec.data[0], *pl;
3227 unsigned short hbtype;
3228 unsigned int payload;
3229 unsigned int padding = 16; /* Use minimum padding */
3231 /* Read type and payload length first */
3236 if (s->msg_callback)
3237 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3238 &s->s3->rrec.data[0], s->s3->rrec.length,
3239 s, s->msg_callback_arg);
3241 if (hbtype == TLS1_HB_REQUEST)
3243 unsigned char *buffer, *bp;
3246 /* Allocate memory for the response, size is 1 bytes
3247 * message type, plus 2 bytes payload length, plus
3248 * payload, plus padding
3250 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3253 /* Enter response type, length and copy payload */
3254 *bp++ = TLS1_HB_RESPONSE;
3256 memcpy(bp, pl, payload);
3258 /* Random padding */
3259 RAND_pseudo_bytes(bp, padding);
3261 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3263 if (r >= 0 && s->msg_callback)
3264 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3265 buffer, 3 + payload + padding,
3266 s, s->msg_callback_arg);
3268 OPENSSL_free(buffer);
3273 else if (hbtype == TLS1_HB_RESPONSE)
3277 /* We only send sequence numbers (2 bytes unsigned int),
3278 * and 16 random bytes, so we just try to read the
3279 * sequence number */
3282 if (payload == 18 && seq == s->tlsext_hb_seq)
3285 s->tlsext_hb_pending = 0;
3293 tls1_heartbeat(SSL *s)
3295 unsigned char *buf, *p;
3297 unsigned int payload = 18; /* Sequence number + random bytes */
3298 unsigned int padding = 16; /* Use minimum padding */
3300 /* Only send if peer supports and accepts HB requests... */
3301 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3302 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3304 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3308 /* ...and there is none in flight yet... */
3309 if (s->tlsext_hb_pending)
3311 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3315 /* ...and no handshake in progress. */
3316 if (SSL_in_init(s) || s->in_handshake)
3318 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3322 /* Check if padding is too long, payload and padding
3323 * must not exceed 2^14 - 3 = 16381 bytes in total.
3325 OPENSSL_assert(payload + padding <= 16381);
3327 /* Create HeartBeat message, we just use a sequence number
3328 * as payload to distuingish different messages and add
3329 * some random stuff.
3330 * - Message Type, 1 byte
3331 * - Payload Length, 2 bytes (unsigned int)
3332 * - Payload, the sequence number (2 bytes uint)
3333 * - Payload, random bytes (16 bytes uint)
3336 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3339 *p++ = TLS1_HB_REQUEST;
3340 /* Payload length (18 bytes here) */
3342 /* Sequence number */
3343 s2n(s->tlsext_hb_seq, p);
3344 /* 16 random bytes */
3345 RAND_pseudo_bytes(p, 16);
3347 /* Random padding */
3348 RAND_pseudo_bytes(p, padding);
3350 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3353 if (s->msg_callback)
3354 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3355 buf, 3 + payload + padding,
3356 s, s->msg_callback_arg);
3358 s->tlsext_hb_pending = 1;
3367 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3372 int sigalgs[MAX_SIGALGLEN];
3375 static int sig_cb(const char *elem, int len, void *arg)
3377 sig_cb_st *sarg = arg;
3380 int sig_alg, hash_alg;
3381 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3383 if (len > (int)(sizeof(etmp) - 1))
3385 memcpy(etmp, elem, len);
3387 p = strchr(etmp, '+');
3395 if (!strcmp(etmp, "RSA"))
3396 sig_alg = EVP_PKEY_RSA;
3397 else if (!strcmp(etmp, "DSA"))
3398 sig_alg = EVP_PKEY_DSA;
3399 else if (!strcmp(etmp, "ECDSA"))
3400 sig_alg = EVP_PKEY_EC;
3403 hash_alg = OBJ_sn2nid(p);
3404 if (hash_alg == NID_undef)
3405 hash_alg = OBJ_ln2nid(p);
3406 if (hash_alg == NID_undef)
3409 for (i = 0; i < sarg->sigalgcnt; i+=2)
3411 if (sarg->sigalgs[i] == sig_alg
3412 && sarg->sigalgs[i + 1] == hash_alg)
3415 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3416 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3420 /* Set suppored signature algorithms based on a colon separated list
3421 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3422 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
3426 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3428 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
3431 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
3433 unsigned char *sigalgs, *sptr;
3438 sigalgs = OPENSSL_malloc(salglen);
3439 if (sigalgs == NULL)
3441 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
3443 rhash = tls12_find_id(*psig_nids++, tls12_md,
3444 sizeof(tls12_md)/sizeof(tls12_lookup));
3445 rsign = tls12_find_id(*psig_nids++, tls12_sig,
3446 sizeof(tls12_sig)/sizeof(tls12_lookup));
3448 if (rhash == -1 || rsign == -1)
3456 if (c->client_sigalgs)
3457 OPENSSL_free(c->client_sigalgs);
3458 c->client_sigalgs = sigalgs;
3459 c->client_sigalgslen = salglen;
3463 if (c->conf_sigalgs)
3464 OPENSSL_free(c->conf_sigalgs);
3465 c->conf_sigalgs = sigalgs;
3466 c->conf_sigalgslen = salglen;
3472 OPENSSL_free(sigalgs);
3476 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
3480 if (default_nid == -1)
3482 sig_nid = X509_get_signature_nid(x);
3484 return sig_nid == default_nid ? 1 : 0;
3485 for (i = 0; i < c->shared_sigalgslen; i++)
3486 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
3491 /* Check certificate chain is consistent with TLS extensions and is
3494 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
3498 int rv = CERT_PKEY_INVALID;
3499 CERT_PKEY *cpk = NULL;
3503 cpk = c->pkeys + idx;
3505 pk = cpk->privatekey;
3507 /* If no cert or key, forget it */
3513 idx = ssl_cert_type(x, pk);
3518 /* Check all signature algorithms are consistent with
3519 * signature algorithms extension if TLS 1.2 or later
3522 if (TLS1_get_version(s) >= TLS1_2_VERSION
3523 && c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3526 unsigned char rsign = 0;
3527 if (c->peer_sigalgs)
3529 /* If no sigalgs extension use defaults from RFC5246 */
3534 case SSL_PKEY_RSA_ENC:
3535 case SSL_PKEY_RSA_SIGN:
3536 case SSL_PKEY_DH_RSA:
3537 rsign = TLSEXT_signature_rsa;
3538 default_nid = NID_sha1WithRSAEncryption;
3541 case SSL_PKEY_DSA_SIGN:
3542 case SSL_PKEY_DH_DSA:
3543 rsign = TLSEXT_signature_dsa;
3544 default_nid = NID_dsaWithSHA1;
3548 rsign = TLSEXT_signature_ecdsa;
3549 default_nid = NID_ecdsa_with_SHA1;
3557 /* If peer sent no signature algorithms extension and we
3558 * have set preferred signature algorithms check we support
3561 if (default_nid > 0 && c->conf_sigalgs)
3564 const unsigned char *p = c->conf_sigalgs;
3565 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
3567 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
3570 if (j == c->conf_sigalgslen)
3573 /* Check signature algorithm of each cert in chain */
3574 if (!tls1_check_sig_alg(c, x, default_nid))
3576 for (i = 0; i < sk_X509_num(chain); i++)
3578 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
3584 /* Check cert parameters are consistent */
3585 if (!tls1_check_cert_param(s, x))
3587 /* In strict mode check rest of chain too */
3588 if (c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3590 for (i = 0; i < sk_X509_num(chain); i++)
3592 if (!tls1_check_cert_param(s, sk_X509_value(chain, i)))
3596 rv = CERT_PKEY_VALID;
3601 if (rv && cpk->digest)
3602 rv |= CERT_PKEY_SIGN;
3603 cpk->valid_flags = rv;
3608 /* Set validity of certificates in an SSL structure */
3609 void tls1_set_cert_validity(SSL *s)
3611 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
3612 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
3613 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
3614 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
3615 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
3616 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
3618 /* User level utiity function to check a chain is suitable */
3619 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
3621 return tls1_check_chain(s, x, pk, chain, -1);