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);
128 SSL3_ENC_METHOD TLSv1_enc_data={
131 tls1_setup_key_block,
132 tls1_generate_master_secret,
133 tls1_change_cipher_state,
134 tls1_final_finish_mac,
135 TLS1_FINISH_MAC_LENGTH,
136 tls1_cert_verify_mac,
137 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
138 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
140 tls1_export_keying_material,
143 long tls1_default_timeout(void)
145 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
146 * is way too long for http, the cache would over fill */
152 if (!ssl3_new(s)) return(0);
153 s->method->ssl_clear(s);
157 void tls1_free(SSL *s)
159 #ifndef OPENSSL_NO_TLSEXT
160 if (s->tlsext_session_ticket)
162 OPENSSL_free(s->tlsext_session_ticket);
164 #endif /* OPENSSL_NO_TLSEXT */
168 void tls1_clear(SSL *s)
171 s->version = s->method->version;
174 #ifndef OPENSSL_NO_EC
176 static int nid_list[] =
178 NID_sect163k1, /* sect163k1 (1) */
179 NID_sect163r1, /* sect163r1 (2) */
180 NID_sect163r2, /* sect163r2 (3) */
181 NID_sect193r1, /* sect193r1 (4) */
182 NID_sect193r2, /* sect193r2 (5) */
183 NID_sect233k1, /* sect233k1 (6) */
184 NID_sect233r1, /* sect233r1 (7) */
185 NID_sect239k1, /* sect239k1 (8) */
186 NID_sect283k1, /* sect283k1 (9) */
187 NID_sect283r1, /* sect283r1 (10) */
188 NID_sect409k1, /* sect409k1 (11) */
189 NID_sect409r1, /* sect409r1 (12) */
190 NID_sect571k1, /* sect571k1 (13) */
191 NID_sect571r1, /* sect571r1 (14) */
192 NID_secp160k1, /* secp160k1 (15) */
193 NID_secp160r1, /* secp160r1 (16) */
194 NID_secp160r2, /* secp160r2 (17) */
195 NID_secp192k1, /* secp192k1 (18) */
196 NID_X9_62_prime192v1, /* secp192r1 (19) */
197 NID_secp224k1, /* secp224k1 (20) */
198 NID_secp224r1, /* secp224r1 (21) */
199 NID_secp256k1, /* secp256k1 (22) */
200 NID_X9_62_prime256v1, /* secp256r1 (23) */
201 NID_secp384r1, /* secp384r1 (24) */
202 NID_secp521r1 /* secp521r1 (25) */
206 static const unsigned char ecformats_default[] =
208 TLSEXT_ECPOINTFORMAT_uncompressed,
209 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
210 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
213 static const unsigned char eccurves_default[] =
215 0,14, /* sect571r1 (14) */
216 0,13, /* sect571k1 (13) */
217 0,25, /* secp521r1 (25) */
218 0,11, /* sect409k1 (11) */
219 0,12, /* sect409r1 (12) */
220 0,24, /* secp384r1 (24) */
221 0,9, /* sect283k1 (9) */
222 0,10, /* sect283r1 (10) */
223 0,22, /* secp256k1 (22) */
224 0,23, /* secp256r1 (23) */
225 0,8, /* sect239k1 (8) */
226 0,6, /* sect233k1 (6) */
227 0,7, /* sect233r1 (7) */
228 0,20, /* secp224k1 (20) */
229 0,21, /* secp224r1 (21) */
230 0,4, /* sect193r1 (4) */
231 0,5, /* sect193r2 (5) */
232 0,18, /* secp192k1 (18) */
233 0,19, /* secp192r1 (19) */
234 0,1, /* sect163k1 (1) */
235 0,2, /* sect163r1 (2) */
236 0,3, /* sect163r2 (3) */
237 0,15, /* secp160k1 (15) */
238 0,16, /* secp160r1 (16) */
239 0,17, /* secp160r2 (17) */
242 int tls1_ec_curve_id2nid(int curve_id)
244 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
245 if ((curve_id < 1) || ((unsigned int)curve_id >
246 sizeof(nid_list)/sizeof(nid_list[0])))
248 return nid_list[curve_id-1];
251 int tls1_ec_nid2curve_id(int nid)
253 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
256 case NID_sect163k1: /* sect163k1 (1) */
258 case NID_sect163r1: /* sect163r1 (2) */
260 case NID_sect163r2: /* sect163r2 (3) */
262 case NID_sect193r1: /* sect193r1 (4) */
264 case NID_sect193r2: /* sect193r2 (5) */
266 case NID_sect233k1: /* sect233k1 (6) */
268 case NID_sect233r1: /* sect233r1 (7) */
270 case NID_sect239k1: /* sect239k1 (8) */
272 case NID_sect283k1: /* sect283k1 (9) */
274 case NID_sect283r1: /* sect283r1 (10) */
276 case NID_sect409k1: /* sect409k1 (11) */
278 case NID_sect409r1: /* sect409r1 (12) */
280 case NID_sect571k1: /* sect571k1 (13) */
282 case NID_sect571r1: /* sect571r1 (14) */
284 case NID_secp160k1: /* secp160k1 (15) */
286 case NID_secp160r1: /* secp160r1 (16) */
288 case NID_secp160r2: /* secp160r2 (17) */
290 case NID_secp192k1: /* secp192k1 (18) */
292 case NID_X9_62_prime192v1: /* secp192r1 (19) */
294 case NID_secp224k1: /* secp224k1 (20) */
296 case NID_secp224r1: /* secp224r1 (21) */
298 case NID_secp256k1: /* secp256k1 (22) */
300 case NID_X9_62_prime256v1: /* secp256r1 (23) */
302 case NID_secp384r1: /* secp384r1 (24) */
304 case NID_secp521r1: /* secp521r1 (25) */
310 /* Get curves list, if "sess" is set return client curves otherwise
313 static void tls1_get_curvelist(SSL *s, int sess,
314 const unsigned char **pcurves,
319 *pcurves = s->session->tlsext_ellipticcurvelist;
320 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
324 *pcurves = s->tlsext_ellipticcurvelist;
325 *pcurveslen = s->tlsext_ellipticcurvelist_length;
327 /* If not set use default: for now static structure */
330 *pcurves = eccurves_default;
331 *pcurveslen = sizeof(eccurves_default);
335 /* Return any common values from two lists. One list is used as a
336 * preference list where we return the most preferred match.
338 int tls1_shared_list(SSL *s,
339 const unsigned char *l1, size_t l1len,
340 const unsigned char *l2, size_t l2len,
343 const unsigned char *pref, *supp;
344 size_t preflen, supplen, i, j;
348 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
363 for (i = 0; i < preflen; i++, pref+=2)
365 const unsigned char *tsupp = supp;
366 for (j = 0; j < supplen; j++, tsupp+=2)
368 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
371 return (pref[0] << 8) | pref[1];
376 if (nmatch == -1 && k > 0)
381 int tls1_shared_curve(SSL *s, int nmatch)
383 const unsigned char *l1, *l2;
386 /* Can't do anything on client side */
389 /* Get supported curves */
390 tls1_get_curvelist(s, 0, &l1, &l1len);
391 tls1_get_curvelist(s, 1, &l2, &l2len);
393 id = tls1_shared_list(s, l1, l1len, l2, l2len, nmatch);
396 return tls1_ec_curve_id2nid(id);
399 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
400 int *curves, size_t ncurves)
402 unsigned char *clist, *p;
404 /* Bitmap of curves included to detect duplicates: only works
405 * while curve ids < 32
407 unsigned long dup_list = 0;
408 clist = OPENSSL_malloc(ncurves * 2);
411 for (i = 0, p = clist; i < ncurves; i++)
413 unsigned long idmask;
415 id = tls1_ec_nid2curve_id(curves[i]);
417 if (!id || (dup_list & idmask))
428 *pextlen = ncurves * 2;
432 #define MAX_CURVELIST 25
437 int nid_arr[MAX_CURVELIST];
440 static int nid_cb(const char *elem, int len, void *arg)
442 nid_cb_st *narg = arg;
446 if (narg->nidcnt == MAX_CURVELIST)
448 if (len > (int)(sizeof(etmp) - 1))
450 memcpy(etmp, elem, len);
452 nid = EC_curve_nist2nid(etmp);
453 if (nid == NID_undef)
454 nid = OBJ_sn2nid(etmp);
455 if (nid == NID_undef)
456 nid = OBJ_ln2nid(etmp);
457 if (nid == NID_undef)
459 for (i = 0; i < narg->nidcnt; i++)
460 if (narg->nid_arr[i] == nid)
462 narg->nid_arr[narg->nidcnt++] = nid;
465 /* Set curves based on a colon separate list */
466 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
471 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
473 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
475 /* For an EC key set TLS id and required compression based on parameters */
476 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
482 const EC_METHOD *meth;
485 /* Determine if it is a prime field */
486 grp = EC_KEY_get0_group(ec);
487 pt = EC_KEY_get0_public_key(ec);
490 meth = EC_GROUP_method_of(grp);
493 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
497 /* Determine curve ID */
498 id = EC_GROUP_get_curve_name(grp);
499 id = tls1_ec_nid2curve_id(id);
500 /* If we have an ID set it, otherwise set arbitrary explicit curve */
504 curve_id[1] = (unsigned char)id;
516 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
519 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
521 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
524 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
528 /* Check an EC key is compatible with extensions */
529 static int tls1_check_ec_key(SSL *s,
530 unsigned char *curve_id, unsigned char *comp_id)
532 const unsigned char *p;
534 /* If point formats extension present check it, otherwise everything
535 * is supported (see RFC4492).
537 if (comp_id && s->session->tlsext_ecpointformatlist)
539 p = s->session->tlsext_ecpointformatlist;
540 plen = s->session->tlsext_ecpointformatlist_length;
541 for (i = 0; i < plen; i++, p++)
549 /* If curve list present check it, otherwise everything is
552 if (s->session->tlsext_ellipticcurvelist)
554 p = s->session->tlsext_ellipticcurvelist;
555 plen = s->session->tlsext_ellipticcurvelist_length;
556 for (i = 0; i < plen; i+=2, p+=2)
558 if (p[0] == curve_id[0] && p[1] == curve_id[1])
565 /* Check EC server key is compatible with client extensions */
566 int tls1_check_ec_server_key(SSL *s)
569 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
571 unsigned char comp_id, curve_id[2];
572 if (!cpk->x509 || !cpk->privatekey)
574 pkey = X509_get_pubkey(cpk->x509);
577 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
581 return tls1_check_ec_key(s, curve_id, &comp_id);
583 /* Check EC temporary key is compatible with client extensions */
584 int tls1_check_ec_tmp_key(SSL *s)
586 unsigned char curve_id[2];
587 EC_KEY *ec = s->cert->ecdh_tmp;
590 if (s->cert->ecdh_tmp_cb)
595 if (!tls1_set_ec_id(curve_id, NULL, ec))
597 return tls1_check_ec_key(s, curve_id, NULL);
600 #endif /* OPENSSL_NO_EC */
602 #ifndef OPENSSL_NO_TLSEXT
604 /* List of supported signature algorithms and hashes. Should make this
605 * customisable at some point, for now include everything we support.
608 #ifdef OPENSSL_NO_RSA
609 #define tlsext_sigalg_rsa(md) /* */
611 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
614 #ifdef OPENSSL_NO_DSA
615 #define tlsext_sigalg_dsa(md) /* */
617 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
620 #ifdef OPENSSL_NO_ECDSA
621 #define tlsext_sigalg_ecdsa(md) /* */
623 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
626 #define tlsext_sigalg(md) \
627 tlsext_sigalg_rsa(md) \
628 tlsext_sigalg_dsa(md) \
629 tlsext_sigalg_ecdsa(md)
631 static unsigned char tls12_sigalgs[] = {
632 #ifndef OPENSSL_NO_SHA512
633 tlsext_sigalg(TLSEXT_hash_sha512)
634 tlsext_sigalg(TLSEXT_hash_sha384)
636 #ifndef OPENSSL_NO_SHA256
637 tlsext_sigalg(TLSEXT_hash_sha256)
638 tlsext_sigalg(TLSEXT_hash_sha224)
640 #ifndef OPENSSL_NO_SHA
641 tlsext_sigalg(TLSEXT_hash_sha1)
643 #ifndef OPENSSL_NO_MD5
644 tlsext_sigalg_rsa(TLSEXT_hash_md5)
648 int tls12_get_req_sig_algs(SSL *s, unsigned char *p)
650 size_t slen = sizeof(tls12_sigalgs);
652 /* If FIPS mode don't include MD5 which is last */
657 memcpy(p, tls12_sigalgs, slen);
661 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
664 unsigned char *ret = p;
665 #ifndef OPENSSL_NO_EC
666 /* See if we support any ECC ciphersuites */
668 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
671 unsigned long alg_k, alg_a;
672 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
674 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
676 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
678 alg_k = c->algorithm_mkey;
679 alg_a = c->algorithm_auth;
680 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
681 || (alg_a & SSL_aECDSA)))
690 /* don't add extensions for SSLv3 unless doing secure renegotiation */
691 if (s->client_version == SSL3_VERSION
692 && !s->s3->send_connection_binding)
697 if (ret>=limit) return NULL; /* this really never occurs, but ... */
699 if (s->tlsext_hostname != NULL)
701 /* Add TLS extension servername to the Client Hello message */
702 unsigned long size_str;
705 /* check for enough space.
706 4 for the servername type and entension length
707 2 for servernamelist length
708 1 for the hostname type
709 2 for hostname length
713 if ((lenmax = limit - ret - 9) < 0
714 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
717 /* extension type and length */
718 s2n(TLSEXT_TYPE_server_name,ret);
721 /* length of servername list */
724 /* hostname type, length and hostname */
725 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
727 memcpy(ret, s->tlsext_hostname, size_str);
731 /* Add RI if renegotiating */
736 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
738 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
742 if((limit - p - 4 - el) < 0) return NULL;
744 s2n(TLSEXT_TYPE_renegotiate,ret);
747 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
749 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
756 #ifndef OPENSSL_NO_SRP
757 /* Add SRP username if there is one */
758 if (s->srp_ctx.login != NULL)
759 { /* Add TLS extension SRP username to the Client Hello message */
761 int login_len = strlen(s->srp_ctx.login);
762 if (login_len > 255 || login_len == 0)
764 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
768 /* check for enough space.
769 4 for the srp type type and entension length
770 1 for the srp user identity
771 + srp user identity length
773 if ((limit - ret - 5 - login_len) < 0) return NULL;
775 /* fill in the extension */
776 s2n(TLSEXT_TYPE_srp,ret);
777 s2n(login_len+1,ret);
778 (*ret++) = (unsigned char) login_len;
779 memcpy(ret, s->srp_ctx.login, login_len);
784 #ifndef OPENSSL_NO_EC
787 /* Add TLS extension ECPointFormats to the ClientHello message */
789 const unsigned char *plist;
791 /* If we have a custom point format list use it otherwise
793 plist = s->tlsext_ecpointformatlist;
795 plistlen = s->tlsext_ecpointformatlist_length;
798 plist = ecformats_default;
799 plistlen = sizeof(ecformats_default);
802 if ((lenmax = limit - ret - 5) < 0) return NULL;
803 if (plistlen > (size_t)lenmax) return NULL;
806 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
810 s2n(TLSEXT_TYPE_ec_point_formats,ret);
811 s2n(plistlen + 1,ret);
812 *(ret++) = (unsigned char)plistlen ;
813 memcpy(ret, plist, plistlen);
816 /* Add TLS extension EllipticCurves to the ClientHello message */
817 plist = s->tlsext_ellipticcurvelist;
818 tls1_get_curvelist(s, 0, &plist, &plistlen);
820 if ((lenmax = limit - ret - 6) < 0) return NULL;
821 if (plistlen > (size_t)lenmax) return NULL;
822 if (plistlen > 65532)
824 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
828 s2n(TLSEXT_TYPE_elliptic_curves,ret);
829 s2n(plistlen + 2, ret);
831 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
832 * elliptic_curve_list, but the examples use two bytes.
833 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
834 * resolves this to two bytes.
837 memcpy(ret, plist, plistlen);
840 #endif /* OPENSSL_NO_EC */
842 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
845 if (!s->new_session && s->session && s->session->tlsext_tick)
846 ticklen = s->session->tlsext_ticklen;
847 else if (s->session && s->tlsext_session_ticket &&
848 s->tlsext_session_ticket->data)
850 ticklen = s->tlsext_session_ticket->length;
851 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
852 if (!s->session->tlsext_tick)
854 memcpy(s->session->tlsext_tick,
855 s->tlsext_session_ticket->data,
857 s->session->tlsext_ticklen = ticklen;
861 if (ticklen == 0 && s->tlsext_session_ticket &&
862 s->tlsext_session_ticket->data == NULL)
864 /* Check for enough room 2 for extension type, 2 for len
867 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
868 s2n(TLSEXT_TYPE_session_ticket,ret);
872 memcpy(ret, s->session->tlsext_tick, ticklen);
878 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
880 if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6)
882 s2n(TLSEXT_TYPE_signature_algorithms,ret);
883 s2n(sizeof(tls12_sigalgs) + 2, ret);
884 s2n(sizeof(tls12_sigalgs), ret);
885 memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs));
886 ret += sizeof(tls12_sigalgs);
889 #ifdef TLSEXT_TYPE_opaque_prf_input
890 if (s->s3->client_opaque_prf_input != NULL &&
891 s->version != DTLS1_VERSION)
893 size_t col = s->s3->client_opaque_prf_input_len;
895 if ((long)(limit - ret - 6 - col < 0))
897 if (col > 0xFFFD) /* can't happen */
900 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
903 memcpy(ret, s->s3->client_opaque_prf_input, col);
908 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
909 s->version != DTLS1_VERSION)
912 long extlen, idlen, itmp;
916 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
918 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
919 itmp = i2d_OCSP_RESPID(id, NULL);
925 if (s->tlsext_ocsp_exts)
927 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
934 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
935 s2n(TLSEXT_TYPE_status_request, ret);
936 if (extlen + idlen > 0xFFF0)
938 s2n(extlen + idlen + 5, ret);
939 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
941 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
943 /* save position of id len */
944 unsigned char *q = ret;
945 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
946 /* skip over id len */
948 itmp = i2d_OCSP_RESPID(id, &ret);
954 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
957 #ifndef OPENSSL_NO_HEARTBEATS
958 /* Add Heartbeat extension */
959 s2n(TLSEXT_TYPE_heartbeat,ret);
962 * 1: peer may send requests
963 * 2: peer not allowed to send requests
965 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
966 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
968 *(ret++) = SSL_TLSEXT_HB_ENABLED;
971 #ifndef OPENSSL_NO_NEXTPROTONEG
972 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
974 /* The client advertises an emtpy extension to indicate its
975 * support for Next Protocol Negotiation */
976 if (limit - ret - 4 < 0)
978 s2n(TLSEXT_TYPE_next_proto_neg,ret);
983 if(SSL_get_srtp_profiles(s))
987 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
989 if((limit - p - 4 - el) < 0) return NULL;
991 s2n(TLSEXT_TYPE_use_srtp,ret);
994 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
996 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1002 if ((extdatalen = ret-p-2)== 0)
1009 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1012 unsigned char *ret = p;
1013 #ifndef OPENSSL_NO_NEXTPROTONEG
1014 int next_proto_neg_seen;
1017 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1018 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1022 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1024 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1026 if ((long)(limit - ret - 4) < 0) return NULL;
1028 s2n(TLSEXT_TYPE_server_name,ret);
1032 if(s->s3->send_connection_binding)
1036 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1038 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1042 if((limit - p - 4 - el) < 0) return NULL;
1044 s2n(TLSEXT_TYPE_renegotiate,ret);
1047 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1049 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1056 #ifndef OPENSSL_NO_EC
1057 if (s->tlsext_ecpointformatlist != NULL &&
1058 s->version != DTLS1_VERSION)
1060 /* Add TLS extension ECPointFormats to the ServerHello message */
1063 if ((lenmax = limit - ret - 5) < 0) return NULL;
1064 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1065 if (s->tlsext_ecpointformatlist_length > 255)
1067 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1071 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1072 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1073 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1074 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1075 ret+=s->tlsext_ecpointformatlist_length;
1078 /* Currently the server should not respond with a SupportedCurves extension */
1079 #endif /* OPENSSL_NO_EC */
1081 if (s->tlsext_ticket_expected
1082 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1084 if ((long)(limit - ret - 4) < 0) return NULL;
1085 s2n(TLSEXT_TYPE_session_ticket,ret);
1089 if (s->tlsext_status_expected)
1091 if ((long)(limit - ret - 4) < 0) return NULL;
1092 s2n(TLSEXT_TYPE_status_request,ret);
1096 #ifdef TLSEXT_TYPE_opaque_prf_input
1097 if (s->s3->server_opaque_prf_input != NULL &&
1098 s->version != DTLS1_VERSION)
1100 size_t sol = s->s3->server_opaque_prf_input_len;
1102 if ((long)(limit - ret - 6 - sol) < 0)
1104 if (sol > 0xFFFD) /* can't happen */
1107 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1110 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1119 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1121 if((limit - p - 4 - el) < 0) return NULL;
1123 s2n(TLSEXT_TYPE_use_srtp,ret);
1126 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1128 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1134 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1135 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1136 { const unsigned char cryptopro_ext[36] = {
1137 0xfd, 0xe8, /*65000*/
1138 0x00, 0x20, /*32 bytes length*/
1139 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1140 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1141 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1142 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1143 if (limit-ret<36) return NULL;
1144 memcpy(ret,cryptopro_ext,36);
1149 #ifndef OPENSSL_NO_HEARTBEATS
1150 /* Add Heartbeat extension if we've received one */
1151 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1153 s2n(TLSEXT_TYPE_heartbeat,ret);
1156 * 1: peer may send requests
1157 * 2: peer not allowed to send requests
1159 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1160 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1162 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1167 #ifndef OPENSSL_NO_NEXTPROTONEG
1168 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1169 s->s3->next_proto_neg_seen = 0;
1170 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1172 const unsigned char *npa;
1173 unsigned int npalen;
1176 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1177 if (r == SSL_TLSEXT_ERR_OK)
1179 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1180 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1182 memcpy(ret, npa, npalen);
1184 s->s3->next_proto_neg_seen = 1;
1189 if ((extdatalen = ret-p-2)== 0)
1196 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1198 unsigned short type;
1199 unsigned short size;
1201 unsigned char *data = *p;
1202 int renegotiate_seen = 0;
1203 int sigalg_seen = 0;
1205 s->servername_done = 0;
1206 s->tlsext_status_type = -1;
1207 #ifndef OPENSSL_NO_NEXTPROTONEG
1208 s->s3->next_proto_neg_seen = 0;
1211 #ifndef OPENSSL_NO_HEARTBEATS
1212 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1213 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1216 if (data >= (d+n-2))
1220 if (data > (d+n-len))
1223 while (data <= (d+n-4))
1228 if (data+size > (d+n))
1231 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1233 if (s->tlsext_debug_cb)
1234 s->tlsext_debug_cb(s, 0, type, data, size,
1235 s->tlsext_debug_arg);
1236 /* The servername extension is treated as follows:
1238 - Only the hostname type is supported with a maximum length of 255.
1239 - The servername is rejected if too long or if it contains zeros,
1240 in which case an fatal alert is generated.
1241 - The servername field is maintained together with the session cache.
1242 - When a session is resumed, the servername call back invoked in order
1243 to allow the application to position itself to the right context.
1244 - The servername is acknowledged if it is new for a session or when
1245 it is identical to a previously used for the same session.
1246 Applications can control the behaviour. They can at any time
1247 set a 'desirable' servername for a new SSL object. This can be the
1248 case for example with HTTPS when a Host: header field is received and
1249 a renegotiation is requested. In this case, a possible servername
1250 presented in the new client hello is only acknowledged if it matches
1251 the value of the Host: field.
1252 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1253 if they provide for changing an explicit servername context for the session,
1254 i.e. when the session has been established with a servername extension.
1255 - On session reconnect, the servername extension may be absent.
1259 if (type == TLSEXT_TYPE_server_name)
1261 unsigned char *sdata;
1267 *al = SSL_AD_DECODE_ERROR;
1274 *al = SSL_AD_DECODE_ERROR;
1281 servname_type = *(sdata++);
1287 *al = SSL_AD_DECODE_ERROR;
1290 if (s->servername_done == 0)
1291 switch (servname_type)
1293 case TLSEXT_NAMETYPE_host_name:
1296 if(s->session->tlsext_hostname)
1298 *al = SSL_AD_DECODE_ERROR;
1301 if (len > TLSEXT_MAXLEN_host_name)
1303 *al = TLS1_AD_UNRECOGNIZED_NAME;
1306 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1308 *al = TLS1_AD_INTERNAL_ERROR;
1311 memcpy(s->session->tlsext_hostname, sdata, len);
1312 s->session->tlsext_hostname[len]='\0';
1313 if (strlen(s->session->tlsext_hostname) != len) {
1314 OPENSSL_free(s->session->tlsext_hostname);
1315 s->session->tlsext_hostname = NULL;
1316 *al = TLS1_AD_UNRECOGNIZED_NAME;
1319 s->servername_done = 1;
1323 s->servername_done = s->session->tlsext_hostname
1324 && strlen(s->session->tlsext_hostname) == len
1325 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1337 *al = SSL_AD_DECODE_ERROR;
1342 #ifndef OPENSSL_NO_SRP
1343 else if (type == TLSEXT_TYPE_srp)
1345 if (size <= 0 || ((len = data[0])) != (size -1))
1347 *al = SSL_AD_DECODE_ERROR;
1350 if (s->srp_ctx.login != NULL)
1352 *al = SSL_AD_DECODE_ERROR;
1355 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1357 memcpy(s->srp_ctx.login, &data[1], len);
1358 s->srp_ctx.login[len]='\0';
1360 if (strlen(s->srp_ctx.login) != len)
1362 *al = SSL_AD_DECODE_ERROR;
1368 #ifndef OPENSSL_NO_EC
1369 else if (type == TLSEXT_TYPE_ec_point_formats &&
1370 s->version != DTLS1_VERSION)
1372 unsigned char *sdata = data;
1373 int ecpointformatlist_length = *(sdata++);
1375 if (ecpointformatlist_length != size - 1)
1377 *al = TLS1_AD_DECODE_ERROR;
1382 if(s->session->tlsext_ecpointformatlist)
1384 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1385 s->session->tlsext_ecpointformatlist = NULL;
1387 s->session->tlsext_ecpointformatlist_length = 0;
1388 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1390 *al = TLS1_AD_INTERNAL_ERROR;
1393 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1394 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1397 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1398 sdata = s->session->tlsext_ecpointformatlist;
1399 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1400 fprintf(stderr,"%i ",*(sdata++));
1401 fprintf(stderr,"\n");
1404 else if (type == TLSEXT_TYPE_elliptic_curves &&
1405 s->version != DTLS1_VERSION)
1407 unsigned char *sdata = data;
1408 int ellipticcurvelist_length = (*(sdata++) << 8);
1409 ellipticcurvelist_length += (*(sdata++));
1411 if (ellipticcurvelist_length != size - 2)
1413 *al = TLS1_AD_DECODE_ERROR;
1418 if(s->session->tlsext_ellipticcurvelist)
1420 *al = TLS1_AD_DECODE_ERROR;
1423 s->session->tlsext_ellipticcurvelist_length = 0;
1424 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1426 *al = TLS1_AD_INTERNAL_ERROR;
1429 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1430 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1433 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1434 sdata = s->session->tlsext_ellipticcurvelist;
1435 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1436 fprintf(stderr,"%i ",*(sdata++));
1437 fprintf(stderr,"\n");
1440 #endif /* OPENSSL_NO_EC */
1441 #ifdef TLSEXT_TYPE_opaque_prf_input
1442 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1443 s->version != DTLS1_VERSION)
1445 unsigned char *sdata = data;
1449 *al = SSL_AD_DECODE_ERROR;
1452 n2s(sdata, s->s3->client_opaque_prf_input_len);
1453 if (s->s3->client_opaque_prf_input_len != size - 2)
1455 *al = SSL_AD_DECODE_ERROR;
1459 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1460 OPENSSL_free(s->s3->client_opaque_prf_input);
1461 if (s->s3->client_opaque_prf_input_len == 0)
1462 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1464 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1465 if (s->s3->client_opaque_prf_input == NULL)
1467 *al = TLS1_AD_INTERNAL_ERROR;
1472 else if (type == TLSEXT_TYPE_session_ticket)
1474 if (s->tls_session_ticket_ext_cb &&
1475 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1477 *al = TLS1_AD_INTERNAL_ERROR;
1481 else if (type == TLSEXT_TYPE_renegotiate)
1483 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1485 renegotiate_seen = 1;
1487 else if (type == TLSEXT_TYPE_signature_algorithms)
1490 if (sigalg_seen || size < 2)
1492 *al = SSL_AD_DECODE_ERROR;
1498 if (dsize != size || dsize & 1)
1500 *al = SSL_AD_DECODE_ERROR;
1503 if (!tls1_process_sigalgs(s, data, dsize))
1505 *al = SSL_AD_DECODE_ERROR;
1509 else if (type == TLSEXT_TYPE_status_request &&
1510 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1515 *al = SSL_AD_DECODE_ERROR;
1519 s->tlsext_status_type = *data++;
1521 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1523 const unsigned char *sdata;
1525 /* Read in responder_id_list */
1530 *al = SSL_AD_DECODE_ERROR;
1539 *al = SSL_AD_DECODE_ERROR;
1543 dsize -= 2 + idsize;
1547 *al = SSL_AD_DECODE_ERROR;
1552 id = d2i_OCSP_RESPID(NULL,
1556 *al = SSL_AD_DECODE_ERROR;
1561 OCSP_RESPID_free(id);
1562 *al = SSL_AD_DECODE_ERROR;
1565 if (!s->tlsext_ocsp_ids
1566 && !(s->tlsext_ocsp_ids =
1567 sk_OCSP_RESPID_new_null()))
1569 OCSP_RESPID_free(id);
1570 *al = SSL_AD_INTERNAL_ERROR;
1573 if (!sk_OCSP_RESPID_push(
1574 s->tlsext_ocsp_ids, id))
1576 OCSP_RESPID_free(id);
1577 *al = SSL_AD_INTERNAL_ERROR;
1582 /* Read in request_extensions */
1585 *al = SSL_AD_DECODE_ERROR;
1592 *al = SSL_AD_DECODE_ERROR;
1598 if (s->tlsext_ocsp_exts)
1600 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1601 X509_EXTENSION_free);
1604 s->tlsext_ocsp_exts =
1605 d2i_X509_EXTENSIONS(NULL,
1607 if (!s->tlsext_ocsp_exts
1608 || (data + dsize != sdata))
1610 *al = SSL_AD_DECODE_ERROR;
1615 /* We don't know what to do with any other type
1619 s->tlsext_status_type = -1;
1621 #ifndef OPENSSL_NO_HEARTBEATS
1622 else if (type == TLSEXT_TYPE_heartbeat)
1626 case 0x01: /* Client allows us to send HB requests */
1627 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1629 case 0x02: /* Client doesn't accept HB requests */
1630 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1631 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1633 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1638 #ifndef OPENSSL_NO_NEXTPROTONEG
1639 else if (type == TLSEXT_TYPE_next_proto_neg &&
1640 s->s3->tmp.finish_md_len == 0)
1642 /* We shouldn't accept this extension on a
1645 * s->new_session will be set on renegotiation, but we
1646 * probably shouldn't rely that it couldn't be set on
1647 * the initial renegotation too in certain cases (when
1648 * there's some other reason to disallow resuming an
1649 * earlier session -- the current code won't be doing
1650 * anything like that, but this might change).
1652 * A valid sign that there's been a previous handshake
1653 * in this connection is if s->s3->tmp.finish_md_len >
1654 * 0. (We are talking about a check that will happen
1655 * in the Hello protocol round, well before a new
1656 * Finished message could have been computed.) */
1657 s->s3->next_proto_neg_seen = 1;
1661 /* session ticket processed earlier */
1662 else if (type == TLSEXT_TYPE_use_srtp)
1664 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1676 /* Need RI if renegotiating */
1678 if (!renegotiate_seen && s->renegotiate &&
1679 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1681 *al = SSL_AD_HANDSHAKE_FAILURE;
1682 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
1683 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1690 #ifndef OPENSSL_NO_NEXTPROTONEG
1691 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1692 * elements of zero length are allowed and the set of elements must exactly fill
1693 * the length of the block. */
1694 static int ssl_next_proto_validate(unsigned char *d, unsigned len)
1696 unsigned int off = 0;
1710 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1712 unsigned short length;
1713 unsigned short type;
1714 unsigned short size;
1715 unsigned char *data = *p;
1716 int tlsext_servername = 0;
1717 int renegotiate_seen = 0;
1719 #ifndef OPENSSL_NO_NEXTPROTONEG
1720 s->s3->next_proto_neg_seen = 0;
1723 #ifndef OPENSSL_NO_HEARTBEATS
1724 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1725 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1728 if (data >= (d+n-2))
1732 if (data+length != d+n)
1734 *al = SSL_AD_DECODE_ERROR;
1738 while(data <= (d+n-4))
1743 if (data+size > (d+n))
1746 if (s->tlsext_debug_cb)
1747 s->tlsext_debug_cb(s, 1, type, data, size,
1748 s->tlsext_debug_arg);
1750 if (type == TLSEXT_TYPE_server_name)
1752 if (s->tlsext_hostname == NULL || size > 0)
1754 *al = TLS1_AD_UNRECOGNIZED_NAME;
1757 tlsext_servername = 1;
1760 #ifndef OPENSSL_NO_EC
1761 else if (type == TLSEXT_TYPE_ec_point_formats &&
1762 s->version != DTLS1_VERSION)
1764 unsigned char *sdata = data;
1765 int ecpointformatlist_length = *(sdata++);
1767 if (ecpointformatlist_length != size - 1)
1769 *al = TLS1_AD_DECODE_ERROR;
1772 s->session->tlsext_ecpointformatlist_length = 0;
1773 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1774 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1776 *al = TLS1_AD_INTERNAL_ERROR;
1779 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1780 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1782 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1783 sdata = s->session->tlsext_ecpointformatlist;
1784 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1785 fprintf(stderr,"%i ",*(sdata++));
1786 fprintf(stderr,"\n");
1789 #endif /* OPENSSL_NO_EC */
1791 else if (type == TLSEXT_TYPE_session_ticket)
1793 if (s->tls_session_ticket_ext_cb &&
1794 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1796 *al = TLS1_AD_INTERNAL_ERROR;
1799 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1802 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1805 s->tlsext_ticket_expected = 1;
1807 #ifdef TLSEXT_TYPE_opaque_prf_input
1808 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1809 s->version != DTLS1_VERSION)
1811 unsigned char *sdata = data;
1815 *al = SSL_AD_DECODE_ERROR;
1818 n2s(sdata, s->s3->server_opaque_prf_input_len);
1819 if (s->s3->server_opaque_prf_input_len != size - 2)
1821 *al = SSL_AD_DECODE_ERROR;
1825 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1826 OPENSSL_free(s->s3->server_opaque_prf_input);
1827 if (s->s3->server_opaque_prf_input_len == 0)
1828 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1830 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1832 if (s->s3->server_opaque_prf_input == NULL)
1834 *al = TLS1_AD_INTERNAL_ERROR;
1839 else if (type == TLSEXT_TYPE_status_request &&
1840 s->version != DTLS1_VERSION)
1842 /* MUST be empty and only sent if we've requested
1843 * a status request message.
1845 if ((s->tlsext_status_type == -1) || (size > 0))
1847 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1850 /* Set flag to expect CertificateStatus message */
1851 s->tlsext_status_expected = 1;
1853 #ifndef OPENSSL_NO_NEXTPROTONEG
1854 else if (type == TLSEXT_TYPE_next_proto_neg &&
1855 s->s3->tmp.finish_md_len == 0)
1857 unsigned char *selected;
1858 unsigned char selected_len;
1860 /* We must have requested it. */
1861 if ((s->ctx->next_proto_select_cb == NULL))
1863 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1866 /* The data must be valid */
1867 if (!ssl_next_proto_validate(data, size))
1869 *al = TLS1_AD_DECODE_ERROR;
1872 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
1874 *al = TLS1_AD_INTERNAL_ERROR;
1877 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
1878 if (!s->next_proto_negotiated)
1880 *al = TLS1_AD_INTERNAL_ERROR;
1883 memcpy(s->next_proto_negotiated, selected, selected_len);
1884 s->next_proto_negotiated_len = selected_len;
1885 s->s3->next_proto_neg_seen = 1;
1888 else if (type == TLSEXT_TYPE_renegotiate)
1890 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1892 renegotiate_seen = 1;
1894 #ifndef OPENSSL_NO_HEARTBEATS
1895 else if (type == TLSEXT_TYPE_heartbeat)
1899 case 0x01: /* Server allows us to send HB requests */
1900 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1902 case 0x02: /* Server doesn't accept HB requests */
1903 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1904 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1906 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1911 else if (type == TLSEXT_TYPE_use_srtp)
1913 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
1923 *al = SSL_AD_DECODE_ERROR;
1927 if (!s->hit && tlsext_servername == 1)
1929 if (s->tlsext_hostname)
1931 if (s->session->tlsext_hostname == NULL)
1933 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1934 if (!s->session->tlsext_hostname)
1936 *al = SSL_AD_UNRECOGNIZED_NAME;
1942 *al = SSL_AD_DECODE_ERROR;
1952 /* Determine if we need to see RI. Strictly speaking if we want to
1953 * avoid an attack we should *always* see RI even on initial server
1954 * hello because the client doesn't see any renegotiation during an
1955 * attack. However this would mean we could not connect to any server
1956 * which doesn't support RI so for the immediate future tolerate RI
1957 * absence on initial connect only.
1959 if (!renegotiate_seen
1960 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1961 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1963 *al = SSL_AD_HANDSHAKE_FAILURE;
1964 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1965 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1973 int ssl_prepare_clienthello_tlsext(SSL *s)
1976 #ifdef TLSEXT_TYPE_opaque_prf_input
1980 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1982 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1987 if (s->tlsext_opaque_prf_input != NULL)
1989 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1990 OPENSSL_free(s->s3->client_opaque_prf_input);
1992 if (s->tlsext_opaque_prf_input_len == 0)
1993 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1995 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1996 if (s->s3->client_opaque_prf_input == NULL)
1998 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2001 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2005 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2006 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2013 int ssl_prepare_serverhello_tlsext(SSL *s)
2015 #ifndef OPENSSL_NO_EC
2016 /* If we are server and using an ECC cipher suite, send the point formats we support
2017 * if the client sent us an ECPointsFormat extension. Note that the server is not
2018 * supposed to send an EllipticCurves extension.
2021 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2022 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2023 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2024 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2028 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2029 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2031 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2034 s->tlsext_ecpointformatlist_length = 3;
2035 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2036 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2037 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2039 #endif /* OPENSSL_NO_EC */
2044 int ssl_check_clienthello_tlsext(SSL *s)
2046 int ret=SSL_TLSEXT_ERR_NOACK;
2047 int al = SSL_AD_UNRECOGNIZED_NAME;
2049 #ifndef OPENSSL_NO_EC
2050 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2051 * ssl3_choose_cipher in s3_lib.c.
2053 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2054 * ssl3_choose_cipher in s3_lib.c.
2058 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2059 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2060 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2061 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2063 /* If status request then ask callback what to do.
2064 * Note: this must be called after servername callbacks in case
2065 * the certificate has changed.
2067 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2070 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2073 /* We don't want to send a status request response */
2074 case SSL_TLSEXT_ERR_NOACK:
2075 s->tlsext_status_expected = 0;
2077 /* status request response should be sent */
2078 case SSL_TLSEXT_ERR_OK:
2079 if (s->tlsext_ocsp_resp)
2080 s->tlsext_status_expected = 1;
2082 s->tlsext_status_expected = 0;
2084 /* something bad happened */
2085 case SSL_TLSEXT_ERR_ALERT_FATAL:
2086 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2087 al = SSL_AD_INTERNAL_ERROR;
2092 s->tlsext_status_expected = 0;
2094 #ifdef TLSEXT_TYPE_opaque_prf_input
2096 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2097 * but we might be sending an alert in response to the client hello,
2098 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2102 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2104 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2107 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2108 al = SSL_AD_INTERNAL_ERROR;
2113 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2114 OPENSSL_free(s->s3->server_opaque_prf_input);
2115 s->s3->server_opaque_prf_input = NULL;
2117 if (s->tlsext_opaque_prf_input != NULL)
2119 if (s->s3->client_opaque_prf_input != NULL &&
2120 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2122 /* can only use this extension if we have a server opaque PRF input
2123 * of the same length as the client opaque PRF input! */
2125 if (s->tlsext_opaque_prf_input_len == 0)
2126 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2128 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2129 if (s->s3->server_opaque_prf_input == NULL)
2131 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2132 al = SSL_AD_INTERNAL_ERROR;
2135 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2139 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2141 /* The callback wants to enforce use of the extension,
2142 * but we can't do that with the client opaque PRF input;
2143 * abort the handshake.
2145 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2146 al = SSL_AD_HANDSHAKE_FAILURE;
2154 case SSL_TLSEXT_ERR_ALERT_FATAL:
2155 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2158 case SSL_TLSEXT_ERR_ALERT_WARNING:
2159 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2162 case SSL_TLSEXT_ERR_NOACK:
2163 s->servername_done=0;
2169 int ssl_check_serverhello_tlsext(SSL *s)
2171 int ret=SSL_TLSEXT_ERR_NOACK;
2172 int al = SSL_AD_UNRECOGNIZED_NAME;
2174 #ifndef OPENSSL_NO_EC
2175 /* If we are client and using an elliptic curve cryptography cipher
2176 * suite, then if server returns an EC point formats lists extension
2177 * it must contain uncompressed.
2179 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2180 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2181 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2182 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2183 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2185 /* we are using an ECC cipher */
2187 unsigned char *list;
2188 int found_uncompressed = 0;
2189 list = s->session->tlsext_ecpointformatlist;
2190 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2192 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2194 found_uncompressed = 1;
2198 if (!found_uncompressed)
2200 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2204 ret = SSL_TLSEXT_ERR_OK;
2205 #endif /* OPENSSL_NO_EC */
2207 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2208 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2209 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2210 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2212 #ifdef TLSEXT_TYPE_opaque_prf_input
2213 if (s->s3->server_opaque_prf_input_len > 0)
2215 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2216 * So first verify that we really have a value from the server too. */
2218 if (s->s3->server_opaque_prf_input == NULL)
2220 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2221 al = SSL_AD_HANDSHAKE_FAILURE;
2224 /* Anytime the server *has* sent an opaque PRF input, we need to check
2225 * that we have a client opaque PRF input of the same size. */
2226 if (s->s3->client_opaque_prf_input == NULL ||
2227 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2229 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2230 al = SSL_AD_ILLEGAL_PARAMETER;
2235 /* If we've requested certificate status and we wont get one
2238 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2239 && s->ctx && s->ctx->tlsext_status_cb)
2242 /* Set resp to NULL, resplen to -1 so callback knows
2243 * there is no response.
2245 if (s->tlsext_ocsp_resp)
2247 OPENSSL_free(s->tlsext_ocsp_resp);
2248 s->tlsext_ocsp_resp = NULL;
2250 s->tlsext_ocsp_resplen = -1;
2251 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2254 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2255 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2259 al = SSL_AD_INTERNAL_ERROR;
2260 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2266 case SSL_TLSEXT_ERR_ALERT_FATAL:
2267 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2270 case SSL_TLSEXT_ERR_ALERT_WARNING:
2271 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2274 case SSL_TLSEXT_ERR_NOACK:
2275 s->servername_done=0;
2281 /* Since the server cache lookup is done early on in the processing of the
2282 * ClientHello, and other operations depend on the result, we need to handle
2283 * any TLS session ticket extension at the same time.
2285 * session_id: points at the session ID in the ClientHello. This code will
2286 * read past the end of this in order to parse out the session ticket
2287 * extension, if any.
2288 * len: the length of the session ID.
2289 * limit: a pointer to the first byte after the ClientHello.
2290 * ret: (output) on return, if a ticket was decrypted, then this is set to
2291 * point to the resulting session.
2293 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2294 * ciphersuite, in which case we have no use for session tickets and one will
2295 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2298 * -1: fatal error, either from parsing or decrypting the ticket.
2299 * 0: no ticket was found (or was ignored, based on settings).
2300 * 1: a zero length extension was found, indicating that the client supports
2301 * session tickets but doesn't currently have one to offer.
2302 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2303 * couldn't be decrypted because of a non-fatal error.
2304 * 3: a ticket was successfully decrypted and *ret was set.
2307 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2308 * a new session ticket to the client because the client indicated support
2309 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2310 * a session ticket or we couldn't use the one it gave us, or if
2311 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2312 * Otherwise, s->tlsext_ticket_expected is set to 0.
2314 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2315 const unsigned char *limit, SSL_SESSION **ret)
2317 /* Point after session ID in client hello */
2318 const unsigned char *p = session_id + len;
2322 s->tlsext_ticket_expected = 0;
2324 /* If tickets disabled behave as if no ticket present
2325 * to permit stateful resumption.
2327 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2329 if ((s->version <= SSL3_VERSION) || !limit)
2333 /* Skip past DTLS cookie */
2334 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2341 /* Skip past cipher list */
2346 /* Skip past compression algorithm list */
2351 /* Now at start of extensions */
2352 if ((p + 2) >= limit)
2355 while ((p + 4) <= limit)
2357 unsigned short type, size;
2360 if (p + size > limit)
2362 if (type == TLSEXT_TYPE_session_ticket)
2367 /* The client will accept a ticket but doesn't
2368 * currently have one. */
2369 s->tlsext_ticket_expected = 1;
2372 if (s->tls_session_secret_cb)
2374 /* Indicate that the ticket couldn't be
2375 * decrypted rather than generating the session
2376 * from ticket now, trigger abbreviated
2377 * handshake based on external mechanism to
2378 * calculate the master secret later. */
2381 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2384 case 2: /* ticket couldn't be decrypted */
2385 s->tlsext_ticket_expected = 1;
2387 case 3: /* ticket was decrypted */
2389 case 4: /* ticket decrypted but need to renew */
2390 s->tlsext_ticket_expected = 1;
2392 default: /* fatal error */
2401 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2403 * etick: points to the body of the session ticket extension.
2404 * eticklen: the length of the session tickets extenion.
2405 * sess_id: points at the session ID.
2406 * sesslen: the length of the session ID.
2407 * psess: (output) on return, if a ticket was decrypted, then this is set to
2408 * point to the resulting session.
2411 * -1: fatal error, either from parsing or decrypting the ticket.
2412 * 2: the ticket couldn't be decrypted.
2413 * 3: a ticket was successfully decrypted and *psess was set.
2414 * 4: same as 3, but the ticket needs to be renewed.
2416 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2417 const unsigned char *sess_id, int sesslen,
2418 SSL_SESSION **psess)
2421 unsigned char *sdec;
2422 const unsigned char *p;
2423 int slen, mlen, renew_ticket = 0;
2424 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2427 SSL_CTX *tctx = s->initial_ctx;
2428 /* Need at least keyname + iv + some encrypted data */
2431 /* Initialize session ticket encryption and HMAC contexts */
2432 HMAC_CTX_init(&hctx);
2433 EVP_CIPHER_CTX_init(&ctx);
2434 if (tctx->tlsext_ticket_key_cb)
2436 unsigned char *nctick = (unsigned char *)etick;
2437 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2448 /* Check key name matches */
2449 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2451 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2452 tlsext_tick_md(), NULL);
2453 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2454 tctx->tlsext_tick_aes_key, etick + 16);
2456 /* Attempt to process session ticket, first conduct sanity and
2457 * integrity checks on ticket.
2459 mlen = HMAC_size(&hctx);
2462 EVP_CIPHER_CTX_cleanup(&ctx);
2466 /* Check HMAC of encrypted ticket */
2467 HMAC_Update(&hctx, etick, eticklen);
2468 HMAC_Final(&hctx, tick_hmac, NULL);
2469 HMAC_CTX_cleanup(&hctx);
2470 if (memcmp(tick_hmac, etick + eticklen, mlen))
2472 /* Attempt to decrypt session data */
2473 /* Move p after IV to start of encrypted ticket, update length */
2474 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2475 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2476 sdec = OPENSSL_malloc(eticklen);
2479 EVP_CIPHER_CTX_cleanup(&ctx);
2482 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2483 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2486 EVP_CIPHER_CTX_cleanup(&ctx);
2489 sess = d2i_SSL_SESSION(NULL, &p, slen);
2493 /* The session ID, if non-empty, is used by some clients to
2494 * detect that the ticket has been accepted. So we copy it to
2495 * the session structure. If it is empty set length to zero
2496 * as required by standard.
2499 memcpy(sess->session_id, sess_id, sesslen);
2500 sess->session_id_length = sesslen;
2508 /* For session parse failure, indicate that we need to send a new
2513 /* Tables to translate from NIDs to TLS v1.2 ids */
2521 static tls12_lookup tls12_md[] = {
2522 {NID_md5, TLSEXT_hash_md5},
2523 {NID_sha1, TLSEXT_hash_sha1},
2524 {NID_sha224, TLSEXT_hash_sha224},
2525 {NID_sha256, TLSEXT_hash_sha256},
2526 {NID_sha384, TLSEXT_hash_sha384},
2527 {NID_sha512, TLSEXT_hash_sha512}
2530 static tls12_lookup tls12_sig[] = {
2531 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2532 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2533 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2536 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2539 for (i = 0; i < tlen; i++)
2541 if (table[i].nid == nid)
2547 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2550 for (i = 0; i < tlen; i++)
2552 if ((table[i].id) == id)
2553 return table[i].nid;
2558 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2563 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2564 sizeof(tls12_md)/sizeof(tls12_lookup));
2567 sig_id = tls12_get_sigid(pk);
2570 p[0] = (unsigned char)md_id;
2571 p[1] = (unsigned char)sig_id;
2575 int tls12_get_sigid(const EVP_PKEY *pk)
2577 return tls12_find_id(pk->type, tls12_sig,
2578 sizeof(tls12_sig)/sizeof(tls12_lookup));
2581 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2585 #ifndef OPENSSL_NO_MD5
2586 case TLSEXT_hash_md5:
2593 #ifndef OPENSSL_NO_SHA
2594 case TLSEXT_hash_sha1:
2597 #ifndef OPENSSL_NO_SHA256
2598 case TLSEXT_hash_sha224:
2599 return EVP_sha224();
2601 case TLSEXT_hash_sha256:
2602 return EVP_sha256();
2604 #ifndef OPENSSL_NO_SHA512
2605 case TLSEXT_hash_sha384:
2606 return EVP_sha384();
2608 case TLSEXT_hash_sha512:
2609 return EVP_sha512();
2617 /* Set preferred digest for each key type */
2619 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
2624 TLS_SIGALGS *sigptr;
2625 /* Extension ignored for TLS versions below 1.2 */
2626 if (TLS1_get_version(s) < TLS1_2_VERSION)
2628 /* Should never happen */
2632 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2633 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2634 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2635 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2638 OPENSSL_free(c->sigalgs);
2639 c->sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS));
2642 c->sigalgslen = dsize/2;
2644 for (i = 0, sigptr = c->sigalgs; i < dsize; i += 2, sigptr++)
2646 sigptr->rhash = data[i];
2647 sigptr->rsign = data[i + 1];
2648 sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md,
2649 sizeof(tls12_md)/sizeof(tls12_lookup));
2650 sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig,
2651 sizeof(tls12_sig)/sizeof(tls12_lookup));
2652 if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid,
2655 sigptr->signandhash_nid = NID_undef;
2656 switch(sigptr->rsign)
2658 #ifndef OPENSSL_NO_RSA
2659 case TLSEXT_signature_rsa:
2660 idx = SSL_PKEY_RSA_SIGN;
2663 #ifndef OPENSSL_NO_DSA
2664 case TLSEXT_signature_dsa:
2665 idx = SSL_PKEY_DSA_SIGN;
2668 #ifndef OPENSSL_NO_ECDSA
2669 case TLSEXT_signature_ecdsa:
2677 if (c->pkeys[idx].digest == NULL)
2679 md = tls12_get_hash(sigptr->rhash);
2682 c->pkeys[idx].digest = md;
2683 if (idx == SSL_PKEY_RSA_SIGN)
2684 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2691 /* Set any remaining keys to default values. NOTE: if alg is not
2692 * supported it stays as NULL.
2694 #ifndef OPENSSL_NO_DSA
2695 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2696 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
2698 #ifndef OPENSSL_NO_RSA
2699 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
2701 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2702 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2705 #ifndef OPENSSL_NO_ECDSA
2706 if (!c->pkeys[SSL_PKEY_ECC].digest)
2707 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
2714 int SSL_get_sigalgs(SSL *s, int idx,
2715 int *psign, int *phash, int *psignandhash,
2716 unsigned char *rsig, unsigned char *rhash)
2718 if (s->cert->sigalgs == NULL)
2723 if (idx >= (int)s->cert->sigalgslen)
2725 psig = s->cert->sigalgs + idx;
2727 *psign = psig->sign_nid;
2729 *phash = psig->hash_nid;
2731 *psignandhash = psig->signandhash_nid;
2733 *rsig = psig->rsign;
2735 *rhash = psig->rhash;
2737 return s->cert->sigalgslen;
2741 #ifndef OPENSSL_NO_HEARTBEATS
2743 tls1_process_heartbeat(SSL *s)
2745 unsigned char *p = &s->s3->rrec.data[0], *pl;
2746 unsigned short hbtype;
2747 unsigned int payload;
2748 unsigned int padding = 16; /* Use minimum padding */
2750 /* Read type and payload length first */
2755 if (s->msg_callback)
2756 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
2757 &s->s3->rrec.data[0], s->s3->rrec.length,
2758 s, s->msg_callback_arg);
2760 if (hbtype == TLS1_HB_REQUEST)
2762 unsigned char *buffer, *bp;
2765 /* Allocate memory for the response, size is 1 bytes
2766 * message type, plus 2 bytes payload length, plus
2767 * payload, plus padding
2769 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
2772 /* Enter response type, length and copy payload */
2773 *bp++ = TLS1_HB_RESPONSE;
2775 memcpy(bp, pl, payload);
2777 /* Random padding */
2778 RAND_pseudo_bytes(bp, padding);
2780 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
2782 if (r >= 0 && s->msg_callback)
2783 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2784 buffer, 3 + payload + padding,
2785 s, s->msg_callback_arg);
2787 OPENSSL_free(buffer);
2792 else if (hbtype == TLS1_HB_RESPONSE)
2796 /* We only send sequence numbers (2 bytes unsigned int),
2797 * and 16 random bytes, so we just try to read the
2798 * sequence number */
2801 if (payload == 18 && seq == s->tlsext_hb_seq)
2804 s->tlsext_hb_pending = 0;
2812 tls1_heartbeat(SSL *s)
2814 unsigned char *buf, *p;
2816 unsigned int payload = 18; /* Sequence number + random bytes */
2817 unsigned int padding = 16; /* Use minimum padding */
2819 /* Only send if peer supports and accepts HB requests... */
2820 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
2821 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
2823 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
2827 /* ...and there is none in flight yet... */
2828 if (s->tlsext_hb_pending)
2830 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
2834 /* ...and no handshake in progress. */
2835 if (SSL_in_init(s) || s->in_handshake)
2837 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
2841 /* Check if padding is too long, payload and padding
2842 * must not exceed 2^14 - 3 = 16381 bytes in total.
2844 OPENSSL_assert(payload + padding <= 16381);
2846 /* Create HeartBeat message, we just use a sequence number
2847 * as payload to distuingish different messages and add
2848 * some random stuff.
2849 * - Message Type, 1 byte
2850 * - Payload Length, 2 bytes (unsigned int)
2851 * - Payload, the sequence number (2 bytes uint)
2852 * - Payload, random bytes (16 bytes uint)
2855 buf = OPENSSL_malloc(1 + 2 + payload + padding);
2858 *p++ = TLS1_HB_REQUEST;
2859 /* Payload length (18 bytes here) */
2861 /* Sequence number */
2862 s2n(s->tlsext_hb_seq, p);
2863 /* 16 random bytes */
2864 RAND_pseudo_bytes(p, 16);
2866 /* Random padding */
2867 RAND_pseudo_bytes(p, padding);
2869 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
2872 if (s->msg_callback)
2873 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2874 buf, 3 + payload + padding,
2875 s, s->msg_callback_arg);
2877 s->tlsext_hb_pending = 1;