2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include <openssl/ocsp.h>
117 #include <openssl/rand.h>
118 #include "ssl_locl.h"
120 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
122 #ifndef OPENSSL_NO_TLSEXT
123 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
124 const unsigned char *sess_id, int sesslen,
125 SSL_SESSION **psess);
126 static int ssl_check_clienthello_tlsext(SSL *s);
127 int ssl_check_serverhello_tlsext(SSL *s);
130 SSL3_ENC_METHOD TLSv1_enc_data={
133 tls1_setup_key_block,
134 tls1_generate_master_secret,
135 tls1_change_cipher_state,
136 tls1_final_finish_mac,
137 TLS1_FINISH_MAC_LENGTH,
138 tls1_cert_verify_mac,
139 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
140 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
142 tls1_export_keying_material,
145 long tls1_default_timeout(void)
147 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
148 * is way too long for http, the cache would over fill */
154 if (!ssl3_new(s)) return(0);
155 s->method->ssl_clear(s);
159 void tls1_free(SSL *s)
161 #ifndef OPENSSL_NO_TLSEXT
162 if (s->tlsext_session_ticket)
164 OPENSSL_free(s->tlsext_session_ticket);
166 #endif /* OPENSSL_NO_TLSEXT */
170 void tls1_clear(SSL *s)
173 s->version = s->method->version;
176 #ifndef OPENSSL_NO_EC
178 static int nid_list[] =
180 NID_sect163k1, /* sect163k1 (1) */
181 NID_sect163r1, /* sect163r1 (2) */
182 NID_sect163r2, /* sect163r2 (3) */
183 NID_sect193r1, /* sect193r1 (4) */
184 NID_sect193r2, /* sect193r2 (5) */
185 NID_sect233k1, /* sect233k1 (6) */
186 NID_sect233r1, /* sect233r1 (7) */
187 NID_sect239k1, /* sect239k1 (8) */
188 NID_sect283k1, /* sect283k1 (9) */
189 NID_sect283r1, /* sect283r1 (10) */
190 NID_sect409k1, /* sect409k1 (11) */
191 NID_sect409r1, /* sect409r1 (12) */
192 NID_sect571k1, /* sect571k1 (13) */
193 NID_sect571r1, /* sect571r1 (14) */
194 NID_secp160k1, /* secp160k1 (15) */
195 NID_secp160r1, /* secp160r1 (16) */
196 NID_secp160r2, /* secp160r2 (17) */
197 NID_secp192k1, /* secp192k1 (18) */
198 NID_X9_62_prime192v1, /* secp192r1 (19) */
199 NID_secp224k1, /* secp224k1 (20) */
200 NID_secp224r1, /* secp224r1 (21) */
201 NID_secp256k1, /* secp256k1 (22) */
202 NID_X9_62_prime256v1, /* secp256r1 (23) */
203 NID_secp384r1, /* secp384r1 (24) */
204 NID_secp521r1 /* secp521r1 (25) */
208 static const unsigned char ecformats_default[] =
210 TLSEXT_ECPOINTFORMAT_uncompressed,
211 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
212 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
215 static const unsigned char eccurves_default[] =
217 0,14, /* sect571r1 (14) */
218 0,13, /* sect571k1 (13) */
219 0,25, /* secp521r1 (25) */
220 0,11, /* sect409k1 (11) */
221 0,12, /* sect409r1 (12) */
222 0,24, /* secp384r1 (24) */
223 0,9, /* sect283k1 (9) */
224 0,10, /* sect283r1 (10) */
225 0,22, /* secp256k1 (22) */
226 0,23, /* secp256r1 (23) */
227 0,8, /* sect239k1 (8) */
228 0,6, /* sect233k1 (6) */
229 0,7, /* sect233r1 (7) */
230 0,20, /* secp224k1 (20) */
231 0,21, /* secp224r1 (21) */
232 0,4, /* sect193r1 (4) */
233 0,5, /* sect193r2 (5) */
234 0,18, /* secp192k1 (18) */
235 0,19, /* secp192r1 (19) */
236 0,1, /* sect163k1 (1) */
237 0,2, /* sect163r1 (2) */
238 0,3, /* sect163r2 (3) */
239 0,15, /* secp160k1 (15) */
240 0,16, /* secp160r1 (16) */
241 0,17, /* secp160r2 (17) */
244 int tls1_ec_curve_id2nid(int curve_id)
246 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
247 if ((curve_id < 1) || ((unsigned int)curve_id >
248 sizeof(nid_list)/sizeof(nid_list[0])))
250 return nid_list[curve_id-1];
253 int tls1_ec_nid2curve_id(int nid)
255 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
258 case NID_sect163k1: /* sect163k1 (1) */
260 case NID_sect163r1: /* sect163r1 (2) */
262 case NID_sect163r2: /* sect163r2 (3) */
264 case NID_sect193r1: /* sect193r1 (4) */
266 case NID_sect193r2: /* sect193r2 (5) */
268 case NID_sect233k1: /* sect233k1 (6) */
270 case NID_sect233r1: /* sect233r1 (7) */
272 case NID_sect239k1: /* sect239k1 (8) */
274 case NID_sect283k1: /* sect283k1 (9) */
276 case NID_sect283r1: /* sect283r1 (10) */
278 case NID_sect409k1: /* sect409k1 (11) */
280 case NID_sect409r1: /* sect409r1 (12) */
282 case NID_sect571k1: /* sect571k1 (13) */
284 case NID_sect571r1: /* sect571r1 (14) */
286 case NID_secp160k1: /* secp160k1 (15) */
288 case NID_secp160r1: /* secp160r1 (16) */
290 case NID_secp160r2: /* secp160r2 (17) */
292 case NID_secp192k1: /* secp192k1 (18) */
294 case NID_X9_62_prime192v1: /* secp192r1 (19) */
296 case NID_secp224k1: /* secp224k1 (20) */
298 case NID_secp224r1: /* secp224r1 (21) */
300 case NID_secp256k1: /* secp256k1 (22) */
302 case NID_X9_62_prime256v1: /* secp256r1 (23) */
304 case NID_secp384r1: /* secp384r1 (24) */
306 case NID_secp521r1: /* secp521r1 (25) */
312 /* Get curves list, if "sess" is set return client curves otherwise
315 static void tls1_get_curvelist(SSL *s, int sess,
316 const unsigned char **pcurves,
321 *pcurves = s->session->tlsext_ellipticcurvelist;
322 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
326 *pcurves = s->tlsext_ellipticcurvelist;
327 *pcurveslen = s->tlsext_ellipticcurvelist_length;
329 /* If not set use default: for now static structure */
332 *pcurves = eccurves_default;
333 *pcurveslen = sizeof(eccurves_default);
337 /* Return nth shared curve. If nmatch == -1 return number of
341 int tls1_shared_curve(SSL *s, int nmatch)
343 const unsigned char *pref, *supp;
344 size_t preflen, supplen, i, j;
346 /* Can't do anything on client side */
349 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
351 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
356 for (i = 0; i < preflen; i++, pref+=2)
358 const unsigned char *tsupp = supp;
359 for (j = 0; j < supplen; j++, tsupp+=2)
361 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
365 int id = (pref[0] << 8) | pref[1];
366 return tls1_ec_curve_id2nid(id);
377 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
378 int *curves, size_t ncurves)
380 unsigned char *clist, *p;
382 /* Bitmap of curves included to detect duplicates: only works
383 * while curve ids < 32
385 unsigned long dup_list = 0;
386 clist = OPENSSL_malloc(ncurves * 2);
389 for (i = 0, p = clist; i < ncurves; i++)
391 unsigned long idmask;
393 id = tls1_ec_nid2curve_id(curves[i]);
395 if (!id || (dup_list & idmask))
406 *pextlen = ncurves * 2;
410 #define MAX_CURVELIST 25
415 int nid_arr[MAX_CURVELIST];
418 static int nid_cb(const char *elem, int len, void *arg)
420 nid_cb_st *narg = arg;
424 if (narg->nidcnt == MAX_CURVELIST)
426 if (len > (int)(sizeof(etmp) - 1))
428 memcpy(etmp, elem, len);
430 nid = EC_curve_nist2nid(etmp);
431 if (nid == NID_undef)
432 nid = OBJ_sn2nid(etmp);
433 if (nid == NID_undef)
434 nid = OBJ_ln2nid(etmp);
435 if (nid == NID_undef)
437 for (i = 0; i < narg->nidcnt; i++)
438 if (narg->nid_arr[i] == nid)
440 narg->nid_arr[narg->nidcnt++] = nid;
443 /* Set curves based on a colon separate list */
444 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
449 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
451 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
453 /* For an EC key set TLS id and required compression based on parameters */
454 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
460 const EC_METHOD *meth;
463 /* Determine if it is a prime field */
464 grp = EC_KEY_get0_group(ec);
465 pt = EC_KEY_get0_public_key(ec);
468 meth = EC_GROUP_method_of(grp);
471 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
475 /* Determine curve ID */
476 id = EC_GROUP_get_curve_name(grp);
477 id = tls1_ec_nid2curve_id(id);
478 /* If we have an ID set it, otherwise set arbitrary explicit curve */
482 curve_id[1] = (unsigned char)id;
494 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
497 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
499 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
502 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
506 /* Check an EC key is compatible with extensions */
507 static int tls1_check_ec_key(SSL *s,
508 unsigned char *curve_id, unsigned char *comp_id)
510 const unsigned char *p;
513 /* If point formats extension present check it, otherwise everything
514 * is supported (see RFC4492).
516 if (comp_id && s->session->tlsext_ecpointformatlist)
518 p = s->session->tlsext_ecpointformatlist;
519 plen = s->session->tlsext_ecpointformatlist_length;
520 for (i = 0; i < plen; i++, p++)
528 /* Check curve is consistent with client and server preferences */
529 for (j = 0; j <= 1; j++)
531 tls1_get_curvelist(s, j, &p, &plen);
532 for (i = 0; i < plen; i+=2, p+=2)
534 if (p[0] == curve_id[0] && p[1] == curve_id[1])
542 /* Check EC server key is compatible with client extensions */
543 int tls1_check_ec_server_key(SSL *s)
546 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
548 unsigned char comp_id, curve_id[2];
549 if (!cpk->x509 || !cpk->privatekey)
551 pkey = X509_get_pubkey(cpk->x509);
554 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
558 return tls1_check_ec_key(s, curve_id, &comp_id);
560 /* Check EC temporary key is compatible with client extensions */
561 int tls1_check_ec_tmp_key(SSL *s)
563 unsigned char curve_id[2];
564 EC_KEY *ec = s->cert->ecdh_tmp;
565 if (s->cert->ecdh_tmp_auto)
567 /* Need a shared curve */
568 if (tls1_shared_curve(s, 0))
574 if (s->cert->ecdh_tmp_cb)
579 if (!tls1_set_ec_id(curve_id, NULL, ec))
581 return tls1_check_ec_key(s, curve_id, NULL);
584 #endif /* OPENSSL_NO_EC */
586 #ifndef OPENSSL_NO_TLSEXT
588 /* List of supported signature algorithms and hashes. Should make this
589 * customisable at some point, for now include everything we support.
592 #ifdef OPENSSL_NO_RSA
593 #define tlsext_sigalg_rsa(md) /* */
595 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
598 #ifdef OPENSSL_NO_DSA
599 #define tlsext_sigalg_dsa(md) /* */
601 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
604 #ifdef OPENSSL_NO_ECDSA
605 #define tlsext_sigalg_ecdsa(md) /* */
607 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
610 #define tlsext_sigalg(md) \
611 tlsext_sigalg_rsa(md) \
612 tlsext_sigalg_dsa(md) \
613 tlsext_sigalg_ecdsa(md)
615 static unsigned char tls12_sigalgs[] = {
616 #ifndef OPENSSL_NO_SHA512
617 tlsext_sigalg(TLSEXT_hash_sha512)
618 tlsext_sigalg(TLSEXT_hash_sha384)
620 #ifndef OPENSSL_NO_SHA256
621 tlsext_sigalg(TLSEXT_hash_sha256)
622 tlsext_sigalg(TLSEXT_hash_sha224)
624 #ifndef OPENSSL_NO_SHA
625 tlsext_sigalg(TLSEXT_hash_sha1)
627 #ifndef OPENSSL_NO_MD5
628 tlsext_sigalg_rsa(TLSEXT_hash_md5)
632 int tls12_get_req_sig_algs(SSL *s, unsigned char *p)
634 size_t slen = sizeof(tls12_sigalgs);
636 /* If FIPS mode don't include MD5 which is last */
641 memcpy(p, tls12_sigalgs, slen);
645 /* byte_compare is a compare function for qsort(3) that compares bytes. */
646 static int byte_compare(const void *in_a, const void *in_b)
648 unsigned char a = *((const unsigned char*) in_a);
649 unsigned char b = *((const unsigned char*) in_b);
658 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
661 unsigned char *ret = p;
662 #ifndef OPENSSL_NO_EC
663 /* See if we support any ECC ciphersuites */
665 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
668 unsigned long alg_k, alg_a;
669 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
671 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
673 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
675 alg_k = c->algorithm_mkey;
676 alg_a = c->algorithm_auth;
677 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
678 || (alg_a & SSL_aECDSA)))
687 /* don't add extensions for SSLv3 unless doing secure renegotiation */
688 if (s->client_version == SSL3_VERSION
689 && !s->s3->send_connection_binding)
694 if (ret>=limit) return NULL; /* this really never occurs, but ... */
696 if (s->tlsext_hostname != NULL)
698 /* Add TLS extension servername to the Client Hello message */
699 unsigned long size_str;
702 /* check for enough space.
703 4 for the servername type and entension length
704 2 for servernamelist length
705 1 for the hostname type
706 2 for hostname length
710 if ((lenmax = limit - ret - 9) < 0
711 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
714 /* extension type and length */
715 s2n(TLSEXT_TYPE_server_name,ret);
718 /* length of servername list */
721 /* hostname type, length and hostname */
722 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
724 memcpy(ret, s->tlsext_hostname, size_str);
728 /* Add RI if renegotiating */
733 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
735 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
739 if((limit - p - 4 - el) < 0) return NULL;
741 s2n(TLSEXT_TYPE_renegotiate,ret);
744 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
746 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
753 #ifndef OPENSSL_NO_SRP
754 /* Add SRP username if there is one */
755 if (s->srp_ctx.login != NULL)
756 { /* Add TLS extension SRP username to the Client Hello message */
758 int login_len = strlen(s->srp_ctx.login);
759 if (login_len > 255 || login_len == 0)
761 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
765 /* check for enough space.
766 4 for the srp type type and entension length
767 1 for the srp user identity
768 + srp user identity length
770 if ((limit - ret - 5 - login_len) < 0) return NULL;
772 /* fill in the extension */
773 s2n(TLSEXT_TYPE_srp,ret);
774 s2n(login_len+1,ret);
775 (*ret++) = (unsigned char) login_len;
776 memcpy(ret, s->srp_ctx.login, login_len);
781 #ifndef OPENSSL_NO_EC
784 /* Add TLS extension ECPointFormats to the ClientHello message */
786 const unsigned char *plist;
788 /* If we have a custom point format list use it otherwise
790 plist = s->tlsext_ecpointformatlist;
792 plistlen = s->tlsext_ecpointformatlist_length;
795 plist = ecformats_default;
796 plistlen = sizeof(ecformats_default);
799 if ((lenmax = limit - ret - 5) < 0) return NULL;
800 if (plistlen > (size_t)lenmax) return NULL;
803 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
807 s2n(TLSEXT_TYPE_ec_point_formats,ret);
808 s2n(plistlen + 1,ret);
809 *(ret++) = (unsigned char)plistlen ;
810 memcpy(ret, plist, plistlen);
813 /* Add TLS extension EllipticCurves to the ClientHello message */
814 plist = s->tlsext_ellipticcurvelist;
815 tls1_get_curvelist(s, 0, &plist, &plistlen);
817 if ((lenmax = limit - ret - 6) < 0) return NULL;
818 if (plistlen > (size_t)lenmax) return NULL;
819 if (plistlen > 65532)
821 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
825 s2n(TLSEXT_TYPE_elliptic_curves,ret);
826 s2n(plistlen + 2, ret);
828 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
829 * elliptic_curve_list, but the examples use two bytes.
830 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
831 * resolves this to two bytes.
834 memcpy(ret, plist, plistlen);
837 #endif /* OPENSSL_NO_EC */
839 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
842 if (!s->new_session && s->session && s->session->tlsext_tick)
843 ticklen = s->session->tlsext_ticklen;
844 else if (s->session && s->tlsext_session_ticket &&
845 s->tlsext_session_ticket->data)
847 ticklen = s->tlsext_session_ticket->length;
848 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
849 if (!s->session->tlsext_tick)
851 memcpy(s->session->tlsext_tick,
852 s->tlsext_session_ticket->data,
854 s->session->tlsext_ticklen = ticklen;
858 if (ticklen == 0 && s->tlsext_session_ticket &&
859 s->tlsext_session_ticket->data == NULL)
861 /* Check for enough room 2 for extension type, 2 for len
864 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
865 s2n(TLSEXT_TYPE_session_ticket,ret);
869 memcpy(ret, s->session->tlsext_tick, ticklen);
875 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
877 if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6)
879 s2n(TLSEXT_TYPE_signature_algorithms,ret);
880 s2n(sizeof(tls12_sigalgs) + 2, ret);
881 s2n(sizeof(tls12_sigalgs), ret);
882 memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs));
883 ret += sizeof(tls12_sigalgs);
886 #ifdef TLSEXT_TYPE_opaque_prf_input
887 if (s->s3->client_opaque_prf_input != NULL &&
888 s->version != DTLS1_VERSION)
890 size_t col = s->s3->client_opaque_prf_input_len;
892 if ((long)(limit - ret - 6 - col < 0))
894 if (col > 0xFFFD) /* can't happen */
897 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
900 memcpy(ret, s->s3->client_opaque_prf_input, col);
905 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
906 s->version != DTLS1_VERSION)
909 long extlen, idlen, itmp;
913 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
915 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
916 itmp = i2d_OCSP_RESPID(id, NULL);
922 if (s->tlsext_ocsp_exts)
924 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
931 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
932 s2n(TLSEXT_TYPE_status_request, ret);
933 if (extlen + idlen > 0xFFF0)
935 s2n(extlen + idlen + 5, ret);
936 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
938 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
940 /* save position of id len */
941 unsigned char *q = ret;
942 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
943 /* skip over id len */
945 itmp = i2d_OCSP_RESPID(id, &ret);
951 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
954 #ifndef OPENSSL_NO_HEARTBEATS
955 /* Add Heartbeat extension */
956 s2n(TLSEXT_TYPE_heartbeat,ret);
959 * 1: peer may send requests
960 * 2: peer not allowed to send requests
962 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
963 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
965 *(ret++) = SSL_TLSEXT_HB_ENABLED;
968 #ifndef OPENSSL_NO_NEXTPROTONEG
969 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
971 /* The client advertises an emtpy extension to indicate its
972 * support for Next Protocol Negotiation */
973 if (limit - ret - 4 < 0)
975 s2n(TLSEXT_TYPE_next_proto_neg,ret);
980 if(SSL_get_srtp_profiles(s))
984 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
986 if((limit - p - 4 - el) < 0) return NULL;
988 s2n(TLSEXT_TYPE_use_srtp,ret);
991 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
993 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
999 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1000 /* 2 bytes for extension type */
1001 /* 2 bytes for extension length */
1002 /* 1 byte for the list length */
1003 /* 1 byte for the list (we only support audit proofs) */
1004 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1007 const unsigned short ext_len = 2;
1008 const unsigned char list_len = 1;
1010 if ((lenmax = limit - ret - 6) < 0) return NULL;
1012 s2n(TLSEXT_TYPE_server_authz, ret);
1013 /* Extension length: 2 bytes */
1015 *(ret++) = list_len;
1016 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1019 if ((extdatalen = ret-p-2) == 0)
1026 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1029 unsigned char *ret = p;
1030 #ifndef OPENSSL_NO_NEXTPROTONEG
1031 int next_proto_neg_seen;
1034 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1035 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1039 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1041 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1043 if ((long)(limit - ret - 4) < 0) return NULL;
1045 s2n(TLSEXT_TYPE_server_name,ret);
1049 if(s->s3->send_connection_binding)
1053 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1055 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1059 if((limit - p - 4 - el) < 0) return NULL;
1061 s2n(TLSEXT_TYPE_renegotiate,ret);
1064 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1066 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1073 #ifndef OPENSSL_NO_EC
1074 if (s->tlsext_ecpointformatlist != NULL &&
1075 s->version != DTLS1_VERSION)
1077 /* Add TLS extension ECPointFormats to the ServerHello message */
1080 if ((lenmax = limit - ret - 5) < 0) return NULL;
1081 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1082 if (s->tlsext_ecpointformatlist_length > 255)
1084 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1088 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1089 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1090 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1091 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1092 ret+=s->tlsext_ecpointformatlist_length;
1095 /* Currently the server should not respond with a SupportedCurves extension */
1096 #endif /* OPENSSL_NO_EC */
1098 if (s->tlsext_ticket_expected
1099 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1101 if ((long)(limit - ret - 4) < 0) return NULL;
1102 s2n(TLSEXT_TYPE_session_ticket,ret);
1106 if (s->tlsext_status_expected)
1108 if ((long)(limit - ret - 4) < 0) return NULL;
1109 s2n(TLSEXT_TYPE_status_request,ret);
1113 #ifdef TLSEXT_TYPE_opaque_prf_input
1114 if (s->s3->server_opaque_prf_input != NULL &&
1115 s->version != DTLS1_VERSION)
1117 size_t sol = s->s3->server_opaque_prf_input_len;
1119 if ((long)(limit - ret - 6 - sol) < 0)
1121 if (sol > 0xFFFD) /* can't happen */
1124 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1127 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1136 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1138 if((limit - p - 4 - el) < 0) return NULL;
1140 s2n(TLSEXT_TYPE_use_srtp,ret);
1143 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1145 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1151 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1152 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1153 { const unsigned char cryptopro_ext[36] = {
1154 0xfd, 0xe8, /*65000*/
1155 0x00, 0x20, /*32 bytes length*/
1156 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1157 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1158 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1159 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1160 if (limit-ret<36) return NULL;
1161 memcpy(ret,cryptopro_ext,36);
1166 #ifndef OPENSSL_NO_HEARTBEATS
1167 /* Add Heartbeat extension if we've received one */
1168 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1170 s2n(TLSEXT_TYPE_heartbeat,ret);
1173 * 1: peer may send requests
1174 * 2: peer not allowed to send requests
1176 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1177 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1179 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1184 #ifndef OPENSSL_NO_NEXTPROTONEG
1185 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1186 s->s3->next_proto_neg_seen = 0;
1187 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1189 const unsigned char *npa;
1190 unsigned int npalen;
1193 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1194 if (r == SSL_TLSEXT_ERR_OK)
1196 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1197 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1199 memcpy(ret, npa, npalen);
1201 s->s3->next_proto_neg_seen = 1;
1206 /* If the client supports authz then see whether we have any to offer
1208 if (s->s3->tlsext_authz_client_types_len)
1210 size_t authz_length;
1211 /* By now we already know the new cipher, so we can look ahead
1212 * to see whether the cert we are going to send
1213 * has any authz data attached to it. */
1214 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1215 const unsigned char* const orig_authz = authz;
1217 unsigned authz_count = 0;
1219 /* The authz data contains a number of the following structures:
1220 * uint8_t authz_type
1222 * uint8_t data[length]
1224 * First we walk over it to find the number of authz elements. */
1225 for (i = 0; i < authz_length; i++)
1227 unsigned short length;
1231 if (memchr(s->s3->tlsext_authz_client_types,
1233 s->s3->tlsext_authz_client_types_len) != NULL)
1243 /* Add TLS extension server_authz to the ServerHello message
1244 * 2 bytes for extension type
1245 * 2 bytes for extension length
1246 * 1 byte for the list length
1247 * n bytes for the list */
1248 const unsigned short ext_len = 1 + authz_count;
1250 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1251 s2n(TLSEXT_TYPE_server_authz, ret);
1253 *(ret++) = authz_count;
1254 s->s3->tlsext_authz_promised_to_client = 1;
1258 for (i = 0; i < authz_length; i++)
1260 unsigned short length;
1265 if (memchr(s->s3->tlsext_authz_client_types,
1267 s->s3->tlsext_authz_client_types_len) != NULL)
1275 if ((extdatalen = ret-p-2)== 0)
1282 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1284 unsigned short type;
1285 unsigned short size;
1287 unsigned char *data = *p;
1288 int renegotiate_seen = 0;
1289 int sigalg_seen = 0;
1291 s->servername_done = 0;
1292 s->tlsext_status_type = -1;
1293 #ifndef OPENSSL_NO_NEXTPROTONEG
1294 s->s3->next_proto_neg_seen = 0;
1297 #ifndef OPENSSL_NO_HEARTBEATS
1298 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1299 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1302 if (data >= (d+n-2))
1306 if (data > (d+n-len))
1309 while (data <= (d+n-4))
1314 if (data+size > (d+n))
1317 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1319 if (s->tlsext_debug_cb)
1320 s->tlsext_debug_cb(s, 0, type, data, size,
1321 s->tlsext_debug_arg);
1322 /* The servername extension is treated as follows:
1324 - Only the hostname type is supported with a maximum length of 255.
1325 - The servername is rejected if too long or if it contains zeros,
1326 in which case an fatal alert is generated.
1327 - The servername field is maintained together with the session cache.
1328 - When a session is resumed, the servername call back invoked in order
1329 to allow the application to position itself to the right context.
1330 - The servername is acknowledged if it is new for a session or when
1331 it is identical to a previously used for the same session.
1332 Applications can control the behaviour. They can at any time
1333 set a 'desirable' servername for a new SSL object. This can be the
1334 case for example with HTTPS when a Host: header field is received and
1335 a renegotiation is requested. In this case, a possible servername
1336 presented in the new client hello is only acknowledged if it matches
1337 the value of the Host: field.
1338 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1339 if they provide for changing an explicit servername context for the session,
1340 i.e. when the session has been established with a servername extension.
1341 - On session reconnect, the servername extension may be absent.
1345 if (type == TLSEXT_TYPE_server_name)
1347 unsigned char *sdata;
1353 *al = SSL_AD_DECODE_ERROR;
1360 *al = SSL_AD_DECODE_ERROR;
1367 servname_type = *(sdata++);
1373 *al = SSL_AD_DECODE_ERROR;
1376 if (s->servername_done == 0)
1377 switch (servname_type)
1379 case TLSEXT_NAMETYPE_host_name:
1382 if(s->session->tlsext_hostname)
1384 *al = SSL_AD_DECODE_ERROR;
1387 if (len > TLSEXT_MAXLEN_host_name)
1389 *al = TLS1_AD_UNRECOGNIZED_NAME;
1392 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1394 *al = TLS1_AD_INTERNAL_ERROR;
1397 memcpy(s->session->tlsext_hostname, sdata, len);
1398 s->session->tlsext_hostname[len]='\0';
1399 if (strlen(s->session->tlsext_hostname) != len) {
1400 OPENSSL_free(s->session->tlsext_hostname);
1401 s->session->tlsext_hostname = NULL;
1402 *al = TLS1_AD_UNRECOGNIZED_NAME;
1405 s->servername_done = 1;
1409 s->servername_done = s->session->tlsext_hostname
1410 && strlen(s->session->tlsext_hostname) == len
1411 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1423 *al = SSL_AD_DECODE_ERROR;
1428 #ifndef OPENSSL_NO_SRP
1429 else if (type == TLSEXT_TYPE_srp)
1431 if (size <= 0 || ((len = data[0])) != (size -1))
1433 *al = SSL_AD_DECODE_ERROR;
1436 if (s->srp_ctx.login != NULL)
1438 *al = SSL_AD_DECODE_ERROR;
1441 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1443 memcpy(s->srp_ctx.login, &data[1], len);
1444 s->srp_ctx.login[len]='\0';
1446 if (strlen(s->srp_ctx.login) != len)
1448 *al = SSL_AD_DECODE_ERROR;
1454 #ifndef OPENSSL_NO_EC
1455 else if (type == TLSEXT_TYPE_ec_point_formats &&
1456 s->version != DTLS1_VERSION)
1458 unsigned char *sdata = data;
1459 int ecpointformatlist_length = *(sdata++);
1461 if (ecpointformatlist_length != size - 1)
1463 *al = TLS1_AD_DECODE_ERROR;
1468 if(s->session->tlsext_ecpointformatlist)
1470 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1471 s->session->tlsext_ecpointformatlist = NULL;
1473 s->session->tlsext_ecpointformatlist_length = 0;
1474 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1476 *al = TLS1_AD_INTERNAL_ERROR;
1479 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1480 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1483 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1484 sdata = s->session->tlsext_ecpointformatlist;
1485 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1486 fprintf(stderr,"%i ",*(sdata++));
1487 fprintf(stderr,"\n");
1490 else if (type == TLSEXT_TYPE_elliptic_curves &&
1491 s->version != DTLS1_VERSION)
1493 unsigned char *sdata = data;
1494 int ellipticcurvelist_length = (*(sdata++) << 8);
1495 ellipticcurvelist_length += (*(sdata++));
1497 if (ellipticcurvelist_length != size - 2)
1499 *al = TLS1_AD_DECODE_ERROR;
1504 if(s->session->tlsext_ellipticcurvelist)
1506 *al = TLS1_AD_DECODE_ERROR;
1509 s->session->tlsext_ellipticcurvelist_length = 0;
1510 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1512 *al = TLS1_AD_INTERNAL_ERROR;
1515 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1516 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1519 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1520 sdata = s->session->tlsext_ellipticcurvelist;
1521 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1522 fprintf(stderr,"%i ",*(sdata++));
1523 fprintf(stderr,"\n");
1526 #endif /* OPENSSL_NO_EC */
1527 #ifdef TLSEXT_TYPE_opaque_prf_input
1528 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1529 s->version != DTLS1_VERSION)
1531 unsigned char *sdata = data;
1535 *al = SSL_AD_DECODE_ERROR;
1538 n2s(sdata, s->s3->client_opaque_prf_input_len);
1539 if (s->s3->client_opaque_prf_input_len != size - 2)
1541 *al = SSL_AD_DECODE_ERROR;
1545 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1546 OPENSSL_free(s->s3->client_opaque_prf_input);
1547 if (s->s3->client_opaque_prf_input_len == 0)
1548 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1550 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1551 if (s->s3->client_opaque_prf_input == NULL)
1553 *al = TLS1_AD_INTERNAL_ERROR;
1558 else if (type == TLSEXT_TYPE_session_ticket)
1560 if (s->tls_session_ticket_ext_cb &&
1561 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1563 *al = TLS1_AD_INTERNAL_ERROR;
1567 else if (type == TLSEXT_TYPE_renegotiate)
1569 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1571 renegotiate_seen = 1;
1573 else if (type == TLSEXT_TYPE_signature_algorithms)
1576 if (sigalg_seen || size < 2)
1578 *al = SSL_AD_DECODE_ERROR;
1584 if (dsize != size || dsize & 1)
1586 *al = SSL_AD_DECODE_ERROR;
1589 if (!tls1_process_sigalgs(s, data, dsize))
1591 *al = SSL_AD_DECODE_ERROR;
1595 else if (type == TLSEXT_TYPE_status_request &&
1596 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1601 *al = SSL_AD_DECODE_ERROR;
1605 s->tlsext_status_type = *data++;
1607 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1609 const unsigned char *sdata;
1611 /* Read in responder_id_list */
1616 *al = SSL_AD_DECODE_ERROR;
1625 *al = SSL_AD_DECODE_ERROR;
1629 dsize -= 2 + idsize;
1633 *al = SSL_AD_DECODE_ERROR;
1638 id = d2i_OCSP_RESPID(NULL,
1642 *al = SSL_AD_DECODE_ERROR;
1647 OCSP_RESPID_free(id);
1648 *al = SSL_AD_DECODE_ERROR;
1651 if (!s->tlsext_ocsp_ids
1652 && !(s->tlsext_ocsp_ids =
1653 sk_OCSP_RESPID_new_null()))
1655 OCSP_RESPID_free(id);
1656 *al = SSL_AD_INTERNAL_ERROR;
1659 if (!sk_OCSP_RESPID_push(
1660 s->tlsext_ocsp_ids, id))
1662 OCSP_RESPID_free(id);
1663 *al = SSL_AD_INTERNAL_ERROR;
1668 /* Read in request_extensions */
1671 *al = SSL_AD_DECODE_ERROR;
1678 *al = SSL_AD_DECODE_ERROR;
1684 if (s->tlsext_ocsp_exts)
1686 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1687 X509_EXTENSION_free);
1690 s->tlsext_ocsp_exts =
1691 d2i_X509_EXTENSIONS(NULL,
1693 if (!s->tlsext_ocsp_exts
1694 || (data + dsize != sdata))
1696 *al = SSL_AD_DECODE_ERROR;
1701 /* We don't know what to do with any other type
1705 s->tlsext_status_type = -1;
1707 #ifndef OPENSSL_NO_HEARTBEATS
1708 else if (type == TLSEXT_TYPE_heartbeat)
1712 case 0x01: /* Client allows us to send HB requests */
1713 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1715 case 0x02: /* Client doesn't accept HB requests */
1716 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1717 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1719 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1724 #ifndef OPENSSL_NO_NEXTPROTONEG
1725 else if (type == TLSEXT_TYPE_next_proto_neg &&
1726 s->s3->tmp.finish_md_len == 0)
1728 /* We shouldn't accept this extension on a
1731 * s->new_session will be set on renegotiation, but we
1732 * probably shouldn't rely that it couldn't be set on
1733 * the initial renegotation too in certain cases (when
1734 * there's some other reason to disallow resuming an
1735 * earlier session -- the current code won't be doing
1736 * anything like that, but this might change).
1738 * A valid sign that there's been a previous handshake
1739 * in this connection is if s->s3->tmp.finish_md_len >
1740 * 0. (We are talking about a check that will happen
1741 * in the Hello protocol round, well before a new
1742 * Finished message could have been computed.) */
1743 s->s3->next_proto_neg_seen = 1;
1747 /* session ticket processed earlier */
1748 else if (type == TLSEXT_TYPE_use_srtp)
1750 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1755 else if (type == TLSEXT_TYPE_server_authz)
1757 unsigned char *sdata = data;
1758 unsigned char server_authz_dataformatlist_length;
1762 *al = TLS1_AD_DECODE_ERROR;
1766 server_authz_dataformatlist_length = *(sdata++);
1768 if (server_authz_dataformatlist_length != size - 1)
1770 *al = TLS1_AD_DECODE_ERROR;
1774 /* Successful session resumption uses the same authz
1775 * information as the original session so we ignore this
1776 * in the case of a session resumption. */
1780 s->s3->tlsext_authz_client_types =
1781 OPENSSL_malloc(server_authz_dataformatlist_length);
1782 if (!s->s3->tlsext_authz_client_types)
1784 *al = TLS1_AD_INTERNAL_ERROR;
1788 s->s3->tlsext_authz_client_types_len =
1789 server_authz_dataformatlist_length;
1790 memcpy(s->s3->tlsext_authz_client_types,
1792 server_authz_dataformatlist_length);
1794 /* Sort the types in order to check for duplicates. */
1795 qsort(s->s3->tlsext_authz_client_types,
1796 server_authz_dataformatlist_length,
1797 1 /* element size */,
1800 for (i = 0; i < server_authz_dataformatlist_length; i++)
1803 s->s3->tlsext_authz_client_types[i] ==
1804 s->s3->tlsext_authz_client_types[i-1])
1806 *al = TLS1_AD_DECODE_ERROR;
1820 /* Need RI if renegotiating */
1822 if (!renegotiate_seen && s->renegotiate &&
1823 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1825 *al = SSL_AD_HANDSHAKE_FAILURE;
1826 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1827 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1834 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1837 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1839 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1843 if (ssl_check_clienthello_tlsext(s) <= 0)
1845 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1851 #ifndef OPENSSL_NO_NEXTPROTONEG
1852 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1853 * elements of zero length are allowed and the set of elements must exactly fill
1854 * the length of the block. */
1855 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1857 unsigned int off = 0;
1871 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1873 unsigned short length;
1874 unsigned short type;
1875 unsigned short size;
1876 unsigned char *data = *p;
1877 int tlsext_servername = 0;
1878 int renegotiate_seen = 0;
1880 #ifndef OPENSSL_NO_NEXTPROTONEG
1881 s->s3->next_proto_neg_seen = 0;
1884 #ifndef OPENSSL_NO_HEARTBEATS
1885 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1886 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1889 if (data >= (d+n-2))
1893 if (data+length != d+n)
1895 *al = SSL_AD_DECODE_ERROR;
1899 while(data <= (d+n-4))
1904 if (data+size > (d+n))
1907 if (s->tlsext_debug_cb)
1908 s->tlsext_debug_cb(s, 1, type, data, size,
1909 s->tlsext_debug_arg);
1911 if (type == TLSEXT_TYPE_server_name)
1913 if (s->tlsext_hostname == NULL || size > 0)
1915 *al = TLS1_AD_UNRECOGNIZED_NAME;
1918 tlsext_servername = 1;
1921 #ifndef OPENSSL_NO_EC
1922 else if (type == TLSEXT_TYPE_ec_point_formats &&
1923 s->version != DTLS1_VERSION)
1925 unsigned char *sdata = data;
1926 int ecpointformatlist_length = *(sdata++);
1928 if (ecpointformatlist_length != size - 1)
1930 *al = TLS1_AD_DECODE_ERROR;
1933 s->session->tlsext_ecpointformatlist_length = 0;
1934 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1935 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1937 *al = TLS1_AD_INTERNAL_ERROR;
1940 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1941 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1943 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1944 sdata = s->session->tlsext_ecpointformatlist;
1945 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1946 fprintf(stderr,"%i ",*(sdata++));
1947 fprintf(stderr,"\n");
1950 #endif /* OPENSSL_NO_EC */
1952 else if (type == TLSEXT_TYPE_session_ticket)
1954 if (s->tls_session_ticket_ext_cb &&
1955 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1957 *al = TLS1_AD_INTERNAL_ERROR;
1960 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1963 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1966 s->tlsext_ticket_expected = 1;
1968 #ifdef TLSEXT_TYPE_opaque_prf_input
1969 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1970 s->version != DTLS1_VERSION)
1972 unsigned char *sdata = data;
1976 *al = SSL_AD_DECODE_ERROR;
1979 n2s(sdata, s->s3->server_opaque_prf_input_len);
1980 if (s->s3->server_opaque_prf_input_len != size - 2)
1982 *al = SSL_AD_DECODE_ERROR;
1986 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1987 OPENSSL_free(s->s3->server_opaque_prf_input);
1988 if (s->s3->server_opaque_prf_input_len == 0)
1989 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1991 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1993 if (s->s3->server_opaque_prf_input == NULL)
1995 *al = TLS1_AD_INTERNAL_ERROR;
2000 else if (type == TLSEXT_TYPE_status_request &&
2001 s->version != DTLS1_VERSION)
2003 /* MUST be empty and only sent if we've requested
2004 * a status request message.
2006 if ((s->tlsext_status_type == -1) || (size > 0))
2008 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2011 /* Set flag to expect CertificateStatus message */
2012 s->tlsext_status_expected = 1;
2014 #ifndef OPENSSL_NO_NEXTPROTONEG
2015 else if (type == TLSEXT_TYPE_next_proto_neg &&
2016 s->s3->tmp.finish_md_len == 0)
2018 unsigned char *selected;
2019 unsigned char selected_len;
2021 /* We must have requested it. */
2022 if ((s->ctx->next_proto_select_cb == NULL))
2024 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2027 /* The data must be valid */
2028 if (!ssl_next_proto_validate(data, size))
2030 *al = TLS1_AD_DECODE_ERROR;
2033 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2035 *al = TLS1_AD_INTERNAL_ERROR;
2038 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2039 if (!s->next_proto_negotiated)
2041 *al = TLS1_AD_INTERNAL_ERROR;
2044 memcpy(s->next_proto_negotiated, selected, selected_len);
2045 s->next_proto_negotiated_len = selected_len;
2046 s->s3->next_proto_neg_seen = 1;
2049 else if (type == TLSEXT_TYPE_renegotiate)
2051 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2053 renegotiate_seen = 1;
2055 #ifndef OPENSSL_NO_HEARTBEATS
2056 else if (type == TLSEXT_TYPE_heartbeat)
2060 case 0x01: /* Server allows us to send HB requests */
2061 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2063 case 0x02: /* Server doesn't accept HB requests */
2064 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2065 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2067 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2072 else if (type == TLSEXT_TYPE_use_srtp)
2074 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2079 else if (type == TLSEXT_TYPE_server_authz)
2081 /* We only support audit proofs. It's an error to send
2082 * an authz hello extension if the client
2083 * didn't request a proof. */
2084 unsigned char *sdata = data;
2085 unsigned char server_authz_dataformatlist_length;
2087 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2089 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2095 *al = TLS1_AD_DECODE_ERROR;
2099 server_authz_dataformatlist_length = *(sdata++);
2100 if (server_authz_dataformatlist_length != size - 1)
2102 *al = TLS1_AD_DECODE_ERROR;
2106 /* We only support audit proofs, so a legal ServerHello
2107 * authz list contains exactly one entry. */
2108 if (server_authz_dataformatlist_length != 1 ||
2109 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2111 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2115 s->s3->tlsext_authz_server_promised = 1;
2123 *al = SSL_AD_DECODE_ERROR;
2127 if (!s->hit && tlsext_servername == 1)
2129 if (s->tlsext_hostname)
2131 if (s->session->tlsext_hostname == NULL)
2133 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2134 if (!s->session->tlsext_hostname)
2136 *al = SSL_AD_UNRECOGNIZED_NAME;
2142 *al = SSL_AD_DECODE_ERROR;
2152 /* Determine if we need to see RI. Strictly speaking if we want to
2153 * avoid an attack we should *always* see RI even on initial server
2154 * hello because the client doesn't see any renegotiation during an
2155 * attack. However this would mean we could not connect to any server
2156 * which doesn't support RI so for the immediate future tolerate RI
2157 * absence on initial connect only.
2159 if (!renegotiate_seen
2160 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2161 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2163 *al = SSL_AD_HANDSHAKE_FAILURE;
2164 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2165 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2173 int ssl_prepare_clienthello_tlsext(SSL *s)
2176 #ifdef TLSEXT_TYPE_opaque_prf_input
2180 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2182 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2187 if (s->tlsext_opaque_prf_input != NULL)
2189 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2190 OPENSSL_free(s->s3->client_opaque_prf_input);
2192 if (s->tlsext_opaque_prf_input_len == 0)
2193 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2195 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2196 if (s->s3->client_opaque_prf_input == NULL)
2198 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2201 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2205 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2206 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2213 int ssl_prepare_serverhello_tlsext(SSL *s)
2215 #ifndef OPENSSL_NO_EC
2216 /* If we are server and using an ECC cipher suite, send the point formats we support
2217 * if the client sent us an ECPointsFormat extension. Note that the server is not
2218 * supposed to send an EllipticCurves extension.
2221 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2222 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2223 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2224 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2228 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2229 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2231 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2234 s->tlsext_ecpointformatlist_length = 3;
2235 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2236 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2237 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2239 #endif /* OPENSSL_NO_EC */
2244 static int ssl_check_clienthello_tlsext(SSL *s)
2246 int ret=SSL_TLSEXT_ERR_NOACK;
2247 int al = SSL_AD_UNRECOGNIZED_NAME;
2249 #ifndef OPENSSL_NO_EC
2250 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2251 * ssl3_choose_cipher in s3_lib.c.
2253 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2254 * ssl3_choose_cipher in s3_lib.c.
2258 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2259 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2260 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2261 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2263 /* If status request then ask callback what to do.
2264 * Note: this must be called after servername callbacks in case
2265 * the certificate has changed.
2267 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2270 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2273 /* We don't want to send a status request response */
2274 case SSL_TLSEXT_ERR_NOACK:
2275 s->tlsext_status_expected = 0;
2277 /* status request response should be sent */
2278 case SSL_TLSEXT_ERR_OK:
2279 if (s->tlsext_ocsp_resp)
2280 s->tlsext_status_expected = 1;
2282 s->tlsext_status_expected = 0;
2284 /* something bad happened */
2285 case SSL_TLSEXT_ERR_ALERT_FATAL:
2286 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2287 al = SSL_AD_INTERNAL_ERROR;
2292 s->tlsext_status_expected = 0;
2294 #ifdef TLSEXT_TYPE_opaque_prf_input
2296 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2297 * but we might be sending an alert in response to the client hello,
2298 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2302 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2304 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2307 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2308 al = SSL_AD_INTERNAL_ERROR;
2313 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2314 OPENSSL_free(s->s3->server_opaque_prf_input);
2315 s->s3->server_opaque_prf_input = NULL;
2317 if (s->tlsext_opaque_prf_input != NULL)
2319 if (s->s3->client_opaque_prf_input != NULL &&
2320 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2322 /* can only use this extension if we have a server opaque PRF input
2323 * of the same length as the client opaque PRF input! */
2325 if (s->tlsext_opaque_prf_input_len == 0)
2326 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2328 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2329 if (s->s3->server_opaque_prf_input == NULL)
2331 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2332 al = SSL_AD_INTERNAL_ERROR;
2335 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2339 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2341 /* The callback wants to enforce use of the extension,
2342 * but we can't do that with the client opaque PRF input;
2343 * abort the handshake.
2345 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2346 al = SSL_AD_HANDSHAKE_FAILURE;
2354 case SSL_TLSEXT_ERR_ALERT_FATAL:
2355 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2358 case SSL_TLSEXT_ERR_ALERT_WARNING:
2359 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2362 case SSL_TLSEXT_ERR_NOACK:
2363 s->servername_done=0;
2369 int ssl_check_serverhello_tlsext(SSL *s)
2371 int ret=SSL_TLSEXT_ERR_NOACK;
2372 int al = SSL_AD_UNRECOGNIZED_NAME;
2374 #ifndef OPENSSL_NO_EC
2375 /* If we are client and using an elliptic curve cryptography cipher
2376 * suite, then if server returns an EC point formats lists extension
2377 * it must contain uncompressed.
2379 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2380 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2381 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2382 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2383 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2385 /* we are using an ECC cipher */
2387 unsigned char *list;
2388 int found_uncompressed = 0;
2389 list = s->session->tlsext_ecpointformatlist;
2390 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2392 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2394 found_uncompressed = 1;
2398 if (!found_uncompressed)
2400 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2404 ret = SSL_TLSEXT_ERR_OK;
2405 #endif /* OPENSSL_NO_EC */
2407 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2408 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2409 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2410 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2412 #ifdef TLSEXT_TYPE_opaque_prf_input
2413 if (s->s3->server_opaque_prf_input_len > 0)
2415 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2416 * So first verify that we really have a value from the server too. */
2418 if (s->s3->server_opaque_prf_input == NULL)
2420 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2421 al = SSL_AD_HANDSHAKE_FAILURE;
2424 /* Anytime the server *has* sent an opaque PRF input, we need to check
2425 * that we have a client opaque PRF input of the same size. */
2426 if (s->s3->client_opaque_prf_input == NULL ||
2427 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2429 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2430 al = SSL_AD_ILLEGAL_PARAMETER;
2435 /* If we've requested certificate status and we wont get one
2438 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2439 && s->ctx && s->ctx->tlsext_status_cb)
2442 /* Set resp to NULL, resplen to -1 so callback knows
2443 * there is no response.
2445 if (s->tlsext_ocsp_resp)
2447 OPENSSL_free(s->tlsext_ocsp_resp);
2448 s->tlsext_ocsp_resp = NULL;
2450 s->tlsext_ocsp_resplen = -1;
2451 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2454 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2455 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2459 al = SSL_AD_INTERNAL_ERROR;
2460 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2466 case SSL_TLSEXT_ERR_ALERT_FATAL:
2467 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2470 case SSL_TLSEXT_ERR_ALERT_WARNING:
2471 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2474 case SSL_TLSEXT_ERR_NOACK:
2475 s->servername_done=0;
2481 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2484 if (s->version < SSL3_VERSION)
2486 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2488 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2492 if (ssl_check_serverhello_tlsext(s) <= 0)
2494 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2500 /* Since the server cache lookup is done early on in the processing of the
2501 * ClientHello, and other operations depend on the result, we need to handle
2502 * any TLS session ticket extension at the same time.
2504 * session_id: points at the session ID in the ClientHello. This code will
2505 * read past the end of this in order to parse out the session ticket
2506 * extension, if any.
2507 * len: the length of the session ID.
2508 * limit: a pointer to the first byte after the ClientHello.
2509 * ret: (output) on return, if a ticket was decrypted, then this is set to
2510 * point to the resulting session.
2512 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2513 * ciphersuite, in which case we have no use for session tickets and one will
2514 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2517 * -1: fatal error, either from parsing or decrypting the ticket.
2518 * 0: no ticket was found (or was ignored, based on settings).
2519 * 1: a zero length extension was found, indicating that the client supports
2520 * session tickets but doesn't currently have one to offer.
2521 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2522 * couldn't be decrypted because of a non-fatal error.
2523 * 3: a ticket was successfully decrypted and *ret was set.
2526 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2527 * a new session ticket to the client because the client indicated support
2528 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2529 * a session ticket or we couldn't use the one it gave us, or if
2530 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2531 * Otherwise, s->tlsext_ticket_expected is set to 0.
2533 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2534 const unsigned char *limit, SSL_SESSION **ret)
2536 /* Point after session ID in client hello */
2537 const unsigned char *p = session_id + len;
2541 s->tlsext_ticket_expected = 0;
2543 /* If tickets disabled behave as if no ticket present
2544 * to permit stateful resumption.
2546 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2548 if ((s->version <= SSL3_VERSION) || !limit)
2552 /* Skip past DTLS cookie */
2553 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2560 /* Skip past cipher list */
2565 /* Skip past compression algorithm list */
2570 /* Now at start of extensions */
2571 if ((p + 2) >= limit)
2574 while ((p + 4) <= limit)
2576 unsigned short type, size;
2579 if (p + size > limit)
2581 if (type == TLSEXT_TYPE_session_ticket)
2586 /* The client will accept a ticket but doesn't
2587 * currently have one. */
2588 s->tlsext_ticket_expected = 1;
2591 if (s->tls_session_secret_cb)
2593 /* Indicate that the ticket couldn't be
2594 * decrypted rather than generating the session
2595 * from ticket now, trigger abbreviated
2596 * handshake based on external mechanism to
2597 * calculate the master secret later. */
2600 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2603 case 2: /* ticket couldn't be decrypted */
2604 s->tlsext_ticket_expected = 1;
2606 case 3: /* ticket was decrypted */
2608 case 4: /* ticket decrypted but need to renew */
2609 s->tlsext_ticket_expected = 1;
2611 default: /* fatal error */
2620 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2622 * etick: points to the body of the session ticket extension.
2623 * eticklen: the length of the session tickets extenion.
2624 * sess_id: points at the session ID.
2625 * sesslen: the length of the session ID.
2626 * psess: (output) on return, if a ticket was decrypted, then this is set to
2627 * point to the resulting session.
2630 * -1: fatal error, either from parsing or decrypting the ticket.
2631 * 2: the ticket couldn't be decrypted.
2632 * 3: a ticket was successfully decrypted and *psess was set.
2633 * 4: same as 3, but the ticket needs to be renewed.
2635 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2636 const unsigned char *sess_id, int sesslen,
2637 SSL_SESSION **psess)
2640 unsigned char *sdec;
2641 const unsigned char *p;
2642 int slen, mlen, renew_ticket = 0;
2643 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2646 SSL_CTX *tctx = s->initial_ctx;
2647 /* Need at least keyname + iv + some encrypted data */
2650 /* Initialize session ticket encryption and HMAC contexts */
2651 HMAC_CTX_init(&hctx);
2652 EVP_CIPHER_CTX_init(&ctx);
2653 if (tctx->tlsext_ticket_key_cb)
2655 unsigned char *nctick = (unsigned char *)etick;
2656 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2667 /* Check key name matches */
2668 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2670 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2671 tlsext_tick_md(), NULL);
2672 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2673 tctx->tlsext_tick_aes_key, etick + 16);
2675 /* Attempt to process session ticket, first conduct sanity and
2676 * integrity checks on ticket.
2678 mlen = HMAC_size(&hctx);
2681 EVP_CIPHER_CTX_cleanup(&ctx);
2685 /* Check HMAC of encrypted ticket */
2686 HMAC_Update(&hctx, etick, eticklen);
2687 HMAC_Final(&hctx, tick_hmac, NULL);
2688 HMAC_CTX_cleanup(&hctx);
2689 if (memcmp(tick_hmac, etick + eticklen, mlen))
2691 /* Attempt to decrypt session data */
2692 /* Move p after IV to start of encrypted ticket, update length */
2693 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2694 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2695 sdec = OPENSSL_malloc(eticklen);
2698 EVP_CIPHER_CTX_cleanup(&ctx);
2701 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2702 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2705 EVP_CIPHER_CTX_cleanup(&ctx);
2708 sess = d2i_SSL_SESSION(NULL, &p, slen);
2712 /* The session ID, if non-empty, is used by some clients to
2713 * detect that the ticket has been accepted. So we copy it to
2714 * the session structure. If it is empty set length to zero
2715 * as required by standard.
2718 memcpy(sess->session_id, sess_id, sesslen);
2719 sess->session_id_length = sesslen;
2727 /* For session parse failure, indicate that we need to send a new
2732 /* Tables to translate from NIDs to TLS v1.2 ids */
2740 static tls12_lookup tls12_md[] = {
2741 {NID_md5, TLSEXT_hash_md5},
2742 {NID_sha1, TLSEXT_hash_sha1},
2743 {NID_sha224, TLSEXT_hash_sha224},
2744 {NID_sha256, TLSEXT_hash_sha256},
2745 {NID_sha384, TLSEXT_hash_sha384},
2746 {NID_sha512, TLSEXT_hash_sha512}
2749 static tls12_lookup tls12_sig[] = {
2750 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2751 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2752 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2755 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2758 for (i = 0; i < tlen; i++)
2760 if (table[i].nid == nid)
2766 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2769 for (i = 0; i < tlen; i++)
2771 if ((table[i].id) == id)
2772 return table[i].nid;
2777 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2782 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2783 sizeof(tls12_md)/sizeof(tls12_lookup));
2786 sig_id = tls12_get_sigid(pk);
2789 p[0] = (unsigned char)md_id;
2790 p[1] = (unsigned char)sig_id;
2794 int tls12_get_sigid(const EVP_PKEY *pk)
2796 return tls12_find_id(pk->type, tls12_sig,
2797 sizeof(tls12_sig)/sizeof(tls12_lookup));
2800 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2804 #ifndef OPENSSL_NO_MD5
2805 case TLSEXT_hash_md5:
2812 #ifndef OPENSSL_NO_SHA
2813 case TLSEXT_hash_sha1:
2816 #ifndef OPENSSL_NO_SHA256
2817 case TLSEXT_hash_sha224:
2818 return EVP_sha224();
2820 case TLSEXT_hash_sha256:
2821 return EVP_sha256();
2823 #ifndef OPENSSL_NO_SHA512
2824 case TLSEXT_hash_sha384:
2825 return EVP_sha384();
2827 case TLSEXT_hash_sha512:
2828 return EVP_sha512();
2836 /* Set preferred digest for each key type */
2838 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
2843 TLS_SIGALGS *sigptr;
2844 /* Extension ignored for TLS versions below 1.2 */
2845 if (TLS1_get_version(s) < TLS1_2_VERSION)
2847 /* Should never happen */
2851 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2852 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2853 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2854 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2857 OPENSSL_free(c->sigalgs);
2858 c->sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS));
2861 c->sigalgslen = dsize/2;
2863 for (i = 0, sigptr = c->sigalgs; i < dsize; i += 2, sigptr++)
2865 sigptr->rhash = data[i];
2866 sigptr->rsign = data[i + 1];
2867 sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md,
2868 sizeof(tls12_md)/sizeof(tls12_lookup));
2869 sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig,
2870 sizeof(tls12_sig)/sizeof(tls12_lookup));
2871 if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid,
2874 sigptr->signandhash_nid = NID_undef;
2875 switch(sigptr->rsign)
2877 #ifndef OPENSSL_NO_RSA
2878 case TLSEXT_signature_rsa:
2879 idx = SSL_PKEY_RSA_SIGN;
2882 #ifndef OPENSSL_NO_DSA
2883 case TLSEXT_signature_dsa:
2884 idx = SSL_PKEY_DSA_SIGN;
2887 #ifndef OPENSSL_NO_ECDSA
2888 case TLSEXT_signature_ecdsa:
2896 if (c->pkeys[idx].digest == NULL)
2898 md = tls12_get_hash(sigptr->rhash);
2901 c->pkeys[idx].digest = md;
2902 if (idx == SSL_PKEY_RSA_SIGN)
2903 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2910 /* Set any remaining keys to default values. NOTE: if alg is not
2911 * supported it stays as NULL.
2913 #ifndef OPENSSL_NO_DSA
2914 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2915 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
2917 #ifndef OPENSSL_NO_RSA
2918 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
2920 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2921 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2924 #ifndef OPENSSL_NO_ECDSA
2925 if (!c->pkeys[SSL_PKEY_ECC].digest)
2926 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
2933 int SSL_get_sigalgs(SSL *s, int idx,
2934 int *psign, int *phash, int *psignandhash,
2935 unsigned char *rsig, unsigned char *rhash)
2937 if (s->cert->sigalgs == NULL)
2942 if (idx >= (int)s->cert->sigalgslen)
2944 psig = s->cert->sigalgs + idx;
2946 *psign = psig->sign_nid;
2948 *phash = psig->hash_nid;
2950 *psignandhash = psig->signandhash_nid;
2952 *rsig = psig->rsign;
2954 *rhash = psig->rhash;
2956 return s->cert->sigalgslen;
2960 #ifndef OPENSSL_NO_HEARTBEATS
2962 tls1_process_heartbeat(SSL *s)
2964 unsigned char *p = &s->s3->rrec.data[0], *pl;
2965 unsigned short hbtype;
2966 unsigned int payload;
2967 unsigned int padding = 16; /* Use minimum padding */
2969 /* Read type and payload length first */
2974 if (s->msg_callback)
2975 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
2976 &s->s3->rrec.data[0], s->s3->rrec.length,
2977 s, s->msg_callback_arg);
2979 if (hbtype == TLS1_HB_REQUEST)
2981 unsigned char *buffer, *bp;
2984 /* Allocate memory for the response, size is 1 bytes
2985 * message type, plus 2 bytes payload length, plus
2986 * payload, plus padding
2988 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
2991 /* Enter response type, length and copy payload */
2992 *bp++ = TLS1_HB_RESPONSE;
2994 memcpy(bp, pl, payload);
2996 /* Random padding */
2997 RAND_pseudo_bytes(bp, padding);
2999 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3001 if (r >= 0 && s->msg_callback)
3002 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3003 buffer, 3 + payload + padding,
3004 s, s->msg_callback_arg);
3006 OPENSSL_free(buffer);
3011 else if (hbtype == TLS1_HB_RESPONSE)
3015 /* We only send sequence numbers (2 bytes unsigned int),
3016 * and 16 random bytes, so we just try to read the
3017 * sequence number */
3020 if (payload == 18 && seq == s->tlsext_hb_seq)
3023 s->tlsext_hb_pending = 0;
3031 tls1_heartbeat(SSL *s)
3033 unsigned char *buf, *p;
3035 unsigned int payload = 18; /* Sequence number + random bytes */
3036 unsigned int padding = 16; /* Use minimum padding */
3038 /* Only send if peer supports and accepts HB requests... */
3039 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3040 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3042 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3046 /* ...and there is none in flight yet... */
3047 if (s->tlsext_hb_pending)
3049 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3053 /* ...and no handshake in progress. */
3054 if (SSL_in_init(s) || s->in_handshake)
3056 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3060 /* Check if padding is too long, payload and padding
3061 * must not exceed 2^14 - 3 = 16381 bytes in total.
3063 OPENSSL_assert(payload + padding <= 16381);
3065 /* Create HeartBeat message, we just use a sequence number
3066 * as payload to distuingish different messages and add
3067 * some random stuff.
3068 * - Message Type, 1 byte
3069 * - Payload Length, 2 bytes (unsigned int)
3070 * - Payload, the sequence number (2 bytes uint)
3071 * - Payload, random bytes (16 bytes uint)
3074 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3077 *p++ = TLS1_HB_REQUEST;
3078 /* Payload length (18 bytes here) */
3080 /* Sequence number */
3081 s2n(s->tlsext_hb_seq, p);
3082 /* 16 random bytes */
3083 RAND_pseudo_bytes(p, 16);
3085 /* Random padding */
3086 RAND_pseudo_bytes(p, padding);
3088 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3091 if (s->msg_callback)
3092 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3093 buf, 3 + payload + padding,
3094 s, s->msg_callback_arg);
3096 s->tlsext_hb_pending = 1;