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 size_t tls12_get_sig_algs(SSL *s, unsigned char *p)
634 TLS_SIGALGS *sptr = s->cert->conf_sigalgs;
637 /* Use custom signature algorithms if any are set */
641 slen = s->cert->conf_sigalgslen;
645 for (i = 0; i < slen; i++, sptr++)
654 slen = sizeof(tls12_sigalgs);
656 /* If FIPS mode don't include MD5 which is last */
661 memcpy(p, tls12_sigalgs, slen);
665 /* byte_compare is a compare function for qsort(3) that compares bytes. */
666 static int byte_compare(const void *in_a, const void *in_b)
668 unsigned char a = *((const unsigned char*) in_a);
669 unsigned char b = *((const unsigned char*) in_b);
678 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
681 unsigned char *ret = p;
682 #ifndef OPENSSL_NO_EC
683 /* See if we support any ECC ciphersuites */
685 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
688 unsigned long alg_k, alg_a;
689 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
691 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
693 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
695 alg_k = c->algorithm_mkey;
696 alg_a = c->algorithm_auth;
697 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
698 || (alg_a & SSL_aECDSA)))
707 /* don't add extensions for SSLv3 unless doing secure renegotiation */
708 if (s->client_version == SSL3_VERSION
709 && !s->s3->send_connection_binding)
714 if (ret>=limit) return NULL; /* this really never occurs, but ... */
716 if (s->tlsext_hostname != NULL)
718 /* Add TLS extension servername to the Client Hello message */
719 unsigned long size_str;
722 /* check for enough space.
723 4 for the servername type and entension length
724 2 for servernamelist length
725 1 for the hostname type
726 2 for hostname length
730 if ((lenmax = limit - ret - 9) < 0
731 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
734 /* extension type and length */
735 s2n(TLSEXT_TYPE_server_name,ret);
738 /* length of servername list */
741 /* hostname type, length and hostname */
742 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
744 memcpy(ret, s->tlsext_hostname, size_str);
748 /* Add RI if renegotiating */
753 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
755 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
759 if((limit - p - 4 - el) < 0) return NULL;
761 s2n(TLSEXT_TYPE_renegotiate,ret);
764 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
766 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
773 #ifndef OPENSSL_NO_SRP
774 /* Add SRP username if there is one */
775 if (s->srp_ctx.login != NULL)
776 { /* Add TLS extension SRP username to the Client Hello message */
778 int login_len = strlen(s->srp_ctx.login);
779 if (login_len > 255 || login_len == 0)
781 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
785 /* check for enough space.
786 4 for the srp type type and entension length
787 1 for the srp user identity
788 + srp user identity length
790 if ((limit - ret - 5 - login_len) < 0) return NULL;
792 /* fill in the extension */
793 s2n(TLSEXT_TYPE_srp,ret);
794 s2n(login_len+1,ret);
795 (*ret++) = (unsigned char) login_len;
796 memcpy(ret, s->srp_ctx.login, login_len);
801 #ifndef OPENSSL_NO_EC
804 /* Add TLS extension ECPointFormats to the ClientHello message */
806 const unsigned char *plist;
808 /* If we have a custom point format list use it otherwise
810 plist = s->tlsext_ecpointformatlist;
812 plistlen = s->tlsext_ecpointformatlist_length;
815 plist = ecformats_default;
816 plistlen = sizeof(ecformats_default);
819 if ((lenmax = limit - ret - 5) < 0) return NULL;
820 if (plistlen > (size_t)lenmax) return NULL;
823 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
827 s2n(TLSEXT_TYPE_ec_point_formats,ret);
828 s2n(plistlen + 1,ret);
829 *(ret++) = (unsigned char)plistlen ;
830 memcpy(ret, plist, plistlen);
833 /* Add TLS extension EllipticCurves to the ClientHello message */
834 plist = s->tlsext_ellipticcurvelist;
835 tls1_get_curvelist(s, 0, &plist, &plistlen);
837 if ((lenmax = limit - ret - 6) < 0) return NULL;
838 if (plistlen > (size_t)lenmax) return NULL;
839 if (plistlen > 65532)
841 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
845 s2n(TLSEXT_TYPE_elliptic_curves,ret);
846 s2n(plistlen + 2, ret);
848 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
849 * elliptic_curve_list, but the examples use two bytes.
850 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
851 * resolves this to two bytes.
854 memcpy(ret, plist, plistlen);
857 #endif /* OPENSSL_NO_EC */
859 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
862 if (!s->new_session && s->session && s->session->tlsext_tick)
863 ticklen = s->session->tlsext_ticklen;
864 else if (s->session && s->tlsext_session_ticket &&
865 s->tlsext_session_ticket->data)
867 ticklen = s->tlsext_session_ticket->length;
868 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
869 if (!s->session->tlsext_tick)
871 memcpy(s->session->tlsext_tick,
872 s->tlsext_session_ticket->data,
874 s->session->tlsext_ticklen = ticklen;
878 if (ticklen == 0 && s->tlsext_session_ticket &&
879 s->tlsext_session_ticket->data == NULL)
881 /* Check for enough room 2 for extension type, 2 for len
884 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
885 s2n(TLSEXT_TYPE_session_ticket,ret);
889 memcpy(ret, s->session->tlsext_tick, ticklen);
895 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
898 salglen = tls12_get_sig_algs(s, NULL);
899 if ((size_t)(limit - ret) < salglen + 6)
901 s2n(TLSEXT_TYPE_signature_algorithms,ret);
902 s2n(salglen + 2, ret);
904 tls12_get_sig_algs(s, ret);
908 #ifdef TLSEXT_TYPE_opaque_prf_input
909 if (s->s3->client_opaque_prf_input != NULL &&
910 s->version != DTLS1_VERSION)
912 size_t col = s->s3->client_opaque_prf_input_len;
914 if ((long)(limit - ret - 6 - col < 0))
916 if (col > 0xFFFD) /* can't happen */
919 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
922 memcpy(ret, s->s3->client_opaque_prf_input, col);
927 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
928 s->version != DTLS1_VERSION)
931 long extlen, idlen, itmp;
935 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
937 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
938 itmp = i2d_OCSP_RESPID(id, NULL);
944 if (s->tlsext_ocsp_exts)
946 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
953 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
954 s2n(TLSEXT_TYPE_status_request, ret);
955 if (extlen + idlen > 0xFFF0)
957 s2n(extlen + idlen + 5, ret);
958 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
960 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
962 /* save position of id len */
963 unsigned char *q = ret;
964 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
965 /* skip over id len */
967 itmp = i2d_OCSP_RESPID(id, &ret);
973 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
976 #ifndef OPENSSL_NO_HEARTBEATS
977 /* Add Heartbeat extension */
978 s2n(TLSEXT_TYPE_heartbeat,ret);
981 * 1: peer may send requests
982 * 2: peer not allowed to send requests
984 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
985 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
987 *(ret++) = SSL_TLSEXT_HB_ENABLED;
990 #ifndef OPENSSL_NO_NEXTPROTONEG
991 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
993 /* The client advertises an emtpy extension to indicate its
994 * support for Next Protocol Negotiation */
995 if (limit - ret - 4 < 0)
997 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1002 if(SSL_get_srtp_profiles(s))
1006 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1008 if((limit - p - 4 - el) < 0) return NULL;
1010 s2n(TLSEXT_TYPE_use_srtp,ret);
1013 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1015 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1021 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1022 /* 2 bytes for extension type */
1023 /* 2 bytes for extension length */
1024 /* 1 byte for the list length */
1025 /* 1 byte for the list (we only support audit proofs) */
1026 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1029 const unsigned short ext_len = 2;
1030 const unsigned char list_len = 1;
1032 if ((lenmax = limit - ret - 6) < 0) return NULL;
1034 s2n(TLSEXT_TYPE_server_authz, ret);
1035 /* Extension length: 2 bytes */
1037 *(ret++) = list_len;
1038 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1041 if ((extdatalen = ret-p-2) == 0)
1048 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1051 unsigned char *ret = p;
1052 #ifndef OPENSSL_NO_NEXTPROTONEG
1053 int next_proto_neg_seen;
1056 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1057 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1061 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1063 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1065 if ((long)(limit - ret - 4) < 0) return NULL;
1067 s2n(TLSEXT_TYPE_server_name,ret);
1071 if(s->s3->send_connection_binding)
1075 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1077 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1081 if((limit - p - 4 - el) < 0) return NULL;
1083 s2n(TLSEXT_TYPE_renegotiate,ret);
1086 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1088 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1095 #ifndef OPENSSL_NO_EC
1096 if (s->tlsext_ecpointformatlist != NULL &&
1097 s->version != DTLS1_VERSION)
1099 /* Add TLS extension ECPointFormats to the ServerHello message */
1102 if ((lenmax = limit - ret - 5) < 0) return NULL;
1103 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1104 if (s->tlsext_ecpointformatlist_length > 255)
1106 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1110 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1111 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1112 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1113 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1114 ret+=s->tlsext_ecpointformatlist_length;
1117 /* Currently the server should not respond with a SupportedCurves extension */
1118 #endif /* OPENSSL_NO_EC */
1120 if (s->tlsext_ticket_expected
1121 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1123 if ((long)(limit - ret - 4) < 0) return NULL;
1124 s2n(TLSEXT_TYPE_session_ticket,ret);
1128 if (s->tlsext_status_expected)
1130 if ((long)(limit - ret - 4) < 0) return NULL;
1131 s2n(TLSEXT_TYPE_status_request,ret);
1135 #ifdef TLSEXT_TYPE_opaque_prf_input
1136 if (s->s3->server_opaque_prf_input != NULL &&
1137 s->version != DTLS1_VERSION)
1139 size_t sol = s->s3->server_opaque_prf_input_len;
1141 if ((long)(limit - ret - 6 - sol) < 0)
1143 if (sol > 0xFFFD) /* can't happen */
1146 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1149 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1158 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1160 if((limit - p - 4 - el) < 0) return NULL;
1162 s2n(TLSEXT_TYPE_use_srtp,ret);
1165 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1167 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1173 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1174 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1175 { const unsigned char cryptopro_ext[36] = {
1176 0xfd, 0xe8, /*65000*/
1177 0x00, 0x20, /*32 bytes length*/
1178 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1179 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1180 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1181 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1182 if (limit-ret<36) return NULL;
1183 memcpy(ret,cryptopro_ext,36);
1188 #ifndef OPENSSL_NO_HEARTBEATS
1189 /* Add Heartbeat extension if we've received one */
1190 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1192 s2n(TLSEXT_TYPE_heartbeat,ret);
1195 * 1: peer may send requests
1196 * 2: peer not allowed to send requests
1198 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1199 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1201 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1206 #ifndef OPENSSL_NO_NEXTPROTONEG
1207 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1208 s->s3->next_proto_neg_seen = 0;
1209 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1211 const unsigned char *npa;
1212 unsigned int npalen;
1215 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1216 if (r == SSL_TLSEXT_ERR_OK)
1218 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1219 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1221 memcpy(ret, npa, npalen);
1223 s->s3->next_proto_neg_seen = 1;
1228 /* If the client supports authz then see whether we have any to offer
1230 if (s->s3->tlsext_authz_client_types_len)
1232 size_t authz_length;
1233 /* By now we already know the new cipher, so we can look ahead
1234 * to see whether the cert we are going to send
1235 * has any authz data attached to it. */
1236 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1237 const unsigned char* const orig_authz = authz;
1239 unsigned authz_count = 0;
1241 /* The authz data contains a number of the following structures:
1242 * uint8_t authz_type
1244 * uint8_t data[length]
1246 * First we walk over it to find the number of authz elements. */
1247 for (i = 0; i < authz_length; i++)
1249 unsigned short length;
1253 if (memchr(s->s3->tlsext_authz_client_types,
1255 s->s3->tlsext_authz_client_types_len) != NULL)
1259 /* n2s increments authz by 2 */
1267 /* Add TLS extension server_authz to the ServerHello message
1268 * 2 bytes for extension type
1269 * 2 bytes for extension length
1270 * 1 byte for the list length
1271 * n bytes for the list */
1272 const unsigned short ext_len = 1 + authz_count;
1274 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1275 s2n(TLSEXT_TYPE_server_authz, ret);
1277 *(ret++) = authz_count;
1278 s->s3->tlsext_authz_promised_to_client = 1;
1282 for (i = 0; i < authz_length; i++)
1284 unsigned short length;
1289 if (memchr(s->s3->tlsext_authz_client_types,
1291 s->s3->tlsext_authz_client_types_len) != NULL)
1294 /* n2s increments authz by 2 */
1301 if ((extdatalen = ret-p-2)== 0)
1308 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1310 unsigned short type;
1311 unsigned short size;
1313 unsigned char *data = *p;
1314 int renegotiate_seen = 0;
1315 int sigalg_seen = 0;
1317 s->servername_done = 0;
1318 s->tlsext_status_type = -1;
1319 #ifndef OPENSSL_NO_NEXTPROTONEG
1320 s->s3->next_proto_neg_seen = 0;
1323 #ifndef OPENSSL_NO_HEARTBEATS
1324 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1325 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1328 if (data >= (d+n-2))
1332 if (data > (d+n-len))
1335 while (data <= (d+n-4))
1340 if (data+size > (d+n))
1343 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1345 if (s->tlsext_debug_cb)
1346 s->tlsext_debug_cb(s, 0, type, data, size,
1347 s->tlsext_debug_arg);
1348 /* The servername extension is treated as follows:
1350 - Only the hostname type is supported with a maximum length of 255.
1351 - The servername is rejected if too long or if it contains zeros,
1352 in which case an fatal alert is generated.
1353 - The servername field is maintained together with the session cache.
1354 - When a session is resumed, the servername call back invoked in order
1355 to allow the application to position itself to the right context.
1356 - The servername is acknowledged if it is new for a session or when
1357 it is identical to a previously used for the same session.
1358 Applications can control the behaviour. They can at any time
1359 set a 'desirable' servername for a new SSL object. This can be the
1360 case for example with HTTPS when a Host: header field is received and
1361 a renegotiation is requested. In this case, a possible servername
1362 presented in the new client hello is only acknowledged if it matches
1363 the value of the Host: field.
1364 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1365 if they provide for changing an explicit servername context for the session,
1366 i.e. when the session has been established with a servername extension.
1367 - On session reconnect, the servername extension may be absent.
1371 if (type == TLSEXT_TYPE_server_name)
1373 unsigned char *sdata;
1379 *al = SSL_AD_DECODE_ERROR;
1386 *al = SSL_AD_DECODE_ERROR;
1393 servname_type = *(sdata++);
1399 *al = SSL_AD_DECODE_ERROR;
1402 if (s->servername_done == 0)
1403 switch (servname_type)
1405 case TLSEXT_NAMETYPE_host_name:
1408 if(s->session->tlsext_hostname)
1410 *al = SSL_AD_DECODE_ERROR;
1413 if (len > TLSEXT_MAXLEN_host_name)
1415 *al = TLS1_AD_UNRECOGNIZED_NAME;
1418 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1420 *al = TLS1_AD_INTERNAL_ERROR;
1423 memcpy(s->session->tlsext_hostname, sdata, len);
1424 s->session->tlsext_hostname[len]='\0';
1425 if (strlen(s->session->tlsext_hostname) != len) {
1426 OPENSSL_free(s->session->tlsext_hostname);
1427 s->session->tlsext_hostname = NULL;
1428 *al = TLS1_AD_UNRECOGNIZED_NAME;
1431 s->servername_done = 1;
1435 s->servername_done = s->session->tlsext_hostname
1436 && strlen(s->session->tlsext_hostname) == len
1437 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1449 *al = SSL_AD_DECODE_ERROR;
1454 #ifndef OPENSSL_NO_SRP
1455 else if (type == TLSEXT_TYPE_srp)
1457 if (size <= 0 || ((len = data[0])) != (size -1))
1459 *al = SSL_AD_DECODE_ERROR;
1462 if (s->srp_ctx.login != NULL)
1464 *al = SSL_AD_DECODE_ERROR;
1467 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1469 memcpy(s->srp_ctx.login, &data[1], len);
1470 s->srp_ctx.login[len]='\0';
1472 if (strlen(s->srp_ctx.login) != len)
1474 *al = SSL_AD_DECODE_ERROR;
1480 #ifndef OPENSSL_NO_EC
1481 else if (type == TLSEXT_TYPE_ec_point_formats &&
1482 s->version != DTLS1_VERSION)
1484 unsigned char *sdata = data;
1485 int ecpointformatlist_length = *(sdata++);
1487 if (ecpointformatlist_length != size - 1)
1489 *al = TLS1_AD_DECODE_ERROR;
1494 if(s->session->tlsext_ecpointformatlist)
1496 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1497 s->session->tlsext_ecpointformatlist = NULL;
1499 s->session->tlsext_ecpointformatlist_length = 0;
1500 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1502 *al = TLS1_AD_INTERNAL_ERROR;
1505 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1506 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1509 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1510 sdata = s->session->tlsext_ecpointformatlist;
1511 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1512 fprintf(stderr,"%i ",*(sdata++));
1513 fprintf(stderr,"\n");
1516 else if (type == TLSEXT_TYPE_elliptic_curves &&
1517 s->version != DTLS1_VERSION)
1519 unsigned char *sdata = data;
1520 int ellipticcurvelist_length = (*(sdata++) << 8);
1521 ellipticcurvelist_length += (*(sdata++));
1523 if (ellipticcurvelist_length != size - 2)
1525 *al = TLS1_AD_DECODE_ERROR;
1530 if(s->session->tlsext_ellipticcurvelist)
1532 *al = TLS1_AD_DECODE_ERROR;
1535 s->session->tlsext_ellipticcurvelist_length = 0;
1536 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1538 *al = TLS1_AD_INTERNAL_ERROR;
1541 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1542 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1545 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1546 sdata = s->session->tlsext_ellipticcurvelist;
1547 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1548 fprintf(stderr,"%i ",*(sdata++));
1549 fprintf(stderr,"\n");
1552 #endif /* OPENSSL_NO_EC */
1553 #ifdef TLSEXT_TYPE_opaque_prf_input
1554 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1555 s->version != DTLS1_VERSION)
1557 unsigned char *sdata = data;
1561 *al = SSL_AD_DECODE_ERROR;
1564 n2s(sdata, s->s3->client_opaque_prf_input_len);
1565 if (s->s3->client_opaque_prf_input_len != size - 2)
1567 *al = SSL_AD_DECODE_ERROR;
1571 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1572 OPENSSL_free(s->s3->client_opaque_prf_input);
1573 if (s->s3->client_opaque_prf_input_len == 0)
1574 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1576 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1577 if (s->s3->client_opaque_prf_input == NULL)
1579 *al = TLS1_AD_INTERNAL_ERROR;
1584 else if (type == TLSEXT_TYPE_session_ticket)
1586 if (s->tls_session_ticket_ext_cb &&
1587 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1589 *al = TLS1_AD_INTERNAL_ERROR;
1593 else if (type == TLSEXT_TYPE_renegotiate)
1595 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1597 renegotiate_seen = 1;
1599 else if (type == TLSEXT_TYPE_signature_algorithms)
1602 if (sigalg_seen || size < 2)
1604 *al = SSL_AD_DECODE_ERROR;
1610 if (dsize != size || dsize & 1)
1612 *al = SSL_AD_DECODE_ERROR;
1615 if (!tls1_process_sigalgs(s, data, dsize))
1617 *al = SSL_AD_DECODE_ERROR;
1621 else if (type == TLSEXT_TYPE_status_request &&
1622 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1627 *al = SSL_AD_DECODE_ERROR;
1631 s->tlsext_status_type = *data++;
1633 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1635 const unsigned char *sdata;
1637 /* Read in responder_id_list */
1642 *al = SSL_AD_DECODE_ERROR;
1651 *al = SSL_AD_DECODE_ERROR;
1655 dsize -= 2 + idsize;
1659 *al = SSL_AD_DECODE_ERROR;
1664 id = d2i_OCSP_RESPID(NULL,
1668 *al = SSL_AD_DECODE_ERROR;
1673 OCSP_RESPID_free(id);
1674 *al = SSL_AD_DECODE_ERROR;
1677 if (!s->tlsext_ocsp_ids
1678 && !(s->tlsext_ocsp_ids =
1679 sk_OCSP_RESPID_new_null()))
1681 OCSP_RESPID_free(id);
1682 *al = SSL_AD_INTERNAL_ERROR;
1685 if (!sk_OCSP_RESPID_push(
1686 s->tlsext_ocsp_ids, id))
1688 OCSP_RESPID_free(id);
1689 *al = SSL_AD_INTERNAL_ERROR;
1694 /* Read in request_extensions */
1697 *al = SSL_AD_DECODE_ERROR;
1704 *al = SSL_AD_DECODE_ERROR;
1710 if (s->tlsext_ocsp_exts)
1712 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1713 X509_EXTENSION_free);
1716 s->tlsext_ocsp_exts =
1717 d2i_X509_EXTENSIONS(NULL,
1719 if (!s->tlsext_ocsp_exts
1720 || (data + dsize != sdata))
1722 *al = SSL_AD_DECODE_ERROR;
1727 /* We don't know what to do with any other type
1731 s->tlsext_status_type = -1;
1733 #ifndef OPENSSL_NO_HEARTBEATS
1734 else if (type == TLSEXT_TYPE_heartbeat)
1738 case 0x01: /* Client allows us to send HB requests */
1739 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1741 case 0x02: /* Client doesn't accept HB requests */
1742 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1743 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1745 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1750 #ifndef OPENSSL_NO_NEXTPROTONEG
1751 else if (type == TLSEXT_TYPE_next_proto_neg &&
1752 s->s3->tmp.finish_md_len == 0)
1754 /* We shouldn't accept this extension on a
1757 * s->new_session will be set on renegotiation, but we
1758 * probably shouldn't rely that it couldn't be set on
1759 * the initial renegotation too in certain cases (when
1760 * there's some other reason to disallow resuming an
1761 * earlier session -- the current code won't be doing
1762 * anything like that, but this might change).
1764 * A valid sign that there's been a previous handshake
1765 * in this connection is if s->s3->tmp.finish_md_len >
1766 * 0. (We are talking about a check that will happen
1767 * in the Hello protocol round, well before a new
1768 * Finished message could have been computed.) */
1769 s->s3->next_proto_neg_seen = 1;
1773 /* session ticket processed earlier */
1774 else if (type == TLSEXT_TYPE_use_srtp)
1776 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1781 else if (type == TLSEXT_TYPE_server_authz)
1783 unsigned char *sdata = data;
1784 unsigned char server_authz_dataformatlist_length;
1788 *al = TLS1_AD_DECODE_ERROR;
1792 server_authz_dataformatlist_length = *(sdata++);
1794 if (server_authz_dataformatlist_length != size - 1)
1796 *al = TLS1_AD_DECODE_ERROR;
1800 /* Successful session resumption uses the same authz
1801 * information as the original session so we ignore this
1802 * in the case of a session resumption. */
1806 if (s->s3->tlsext_authz_client_types != NULL)
1807 OPENSSL_free(s->s3->tlsext_authz_client_types);
1808 s->s3->tlsext_authz_client_types =
1809 OPENSSL_malloc(server_authz_dataformatlist_length);
1810 if (!s->s3->tlsext_authz_client_types)
1812 *al = TLS1_AD_INTERNAL_ERROR;
1816 s->s3->tlsext_authz_client_types_len =
1817 server_authz_dataformatlist_length;
1818 memcpy(s->s3->tlsext_authz_client_types,
1820 server_authz_dataformatlist_length);
1822 /* Sort the types in order to check for duplicates. */
1823 qsort(s->s3->tlsext_authz_client_types,
1824 server_authz_dataformatlist_length,
1825 1 /* element size */,
1828 for (i = 0; i < server_authz_dataformatlist_length; i++)
1831 s->s3->tlsext_authz_client_types[i] ==
1832 s->s3->tlsext_authz_client_types[i-1])
1834 *al = TLS1_AD_DECODE_ERROR;
1848 /* Need RI if renegotiating */
1850 if (!renegotiate_seen && s->renegotiate &&
1851 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1853 *al = SSL_AD_HANDSHAKE_FAILURE;
1854 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1855 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1862 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1865 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1867 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1871 if (ssl_check_clienthello_tlsext(s) <= 0)
1873 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
1879 #ifndef OPENSSL_NO_NEXTPROTONEG
1880 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1881 * elements of zero length are allowed and the set of elements must exactly fill
1882 * the length of the block. */
1883 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1885 unsigned int off = 0;
1899 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1901 unsigned short length;
1902 unsigned short type;
1903 unsigned short size;
1904 unsigned char *data = *p;
1905 int tlsext_servername = 0;
1906 int renegotiate_seen = 0;
1908 #ifndef OPENSSL_NO_NEXTPROTONEG
1909 s->s3->next_proto_neg_seen = 0;
1912 #ifndef OPENSSL_NO_HEARTBEATS
1913 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1914 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1917 if (data >= (d+n-2))
1921 if (data+length != d+n)
1923 *al = SSL_AD_DECODE_ERROR;
1927 while(data <= (d+n-4))
1932 if (data+size > (d+n))
1935 if (s->tlsext_debug_cb)
1936 s->tlsext_debug_cb(s, 1, type, data, size,
1937 s->tlsext_debug_arg);
1939 if (type == TLSEXT_TYPE_server_name)
1941 if (s->tlsext_hostname == NULL || size > 0)
1943 *al = TLS1_AD_UNRECOGNIZED_NAME;
1946 tlsext_servername = 1;
1949 #ifndef OPENSSL_NO_EC
1950 else if (type == TLSEXT_TYPE_ec_point_formats &&
1951 s->version != DTLS1_VERSION)
1953 unsigned char *sdata = data;
1954 int ecpointformatlist_length = *(sdata++);
1956 if (ecpointformatlist_length != size - 1)
1958 *al = TLS1_AD_DECODE_ERROR;
1961 s->session->tlsext_ecpointformatlist_length = 0;
1962 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1963 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1965 *al = TLS1_AD_INTERNAL_ERROR;
1968 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1969 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1971 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1972 sdata = s->session->tlsext_ecpointformatlist;
1973 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1974 fprintf(stderr,"%i ",*(sdata++));
1975 fprintf(stderr,"\n");
1978 #endif /* OPENSSL_NO_EC */
1980 else if (type == TLSEXT_TYPE_session_ticket)
1982 if (s->tls_session_ticket_ext_cb &&
1983 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1985 *al = TLS1_AD_INTERNAL_ERROR;
1988 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1991 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1994 s->tlsext_ticket_expected = 1;
1996 #ifdef TLSEXT_TYPE_opaque_prf_input
1997 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1998 s->version != DTLS1_VERSION)
2000 unsigned char *sdata = data;
2004 *al = SSL_AD_DECODE_ERROR;
2007 n2s(sdata, s->s3->server_opaque_prf_input_len);
2008 if (s->s3->server_opaque_prf_input_len != size - 2)
2010 *al = SSL_AD_DECODE_ERROR;
2014 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2015 OPENSSL_free(s->s3->server_opaque_prf_input);
2016 if (s->s3->server_opaque_prf_input_len == 0)
2017 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2019 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2021 if (s->s3->server_opaque_prf_input == NULL)
2023 *al = TLS1_AD_INTERNAL_ERROR;
2028 else if (type == TLSEXT_TYPE_status_request &&
2029 s->version != DTLS1_VERSION)
2031 /* MUST be empty and only sent if we've requested
2032 * a status request message.
2034 if ((s->tlsext_status_type == -1) || (size > 0))
2036 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2039 /* Set flag to expect CertificateStatus message */
2040 s->tlsext_status_expected = 1;
2042 #ifndef OPENSSL_NO_NEXTPROTONEG
2043 else if (type == TLSEXT_TYPE_next_proto_neg &&
2044 s->s3->tmp.finish_md_len == 0)
2046 unsigned char *selected;
2047 unsigned char selected_len;
2049 /* We must have requested it. */
2050 if ((s->ctx->next_proto_select_cb == NULL))
2052 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2055 /* The data must be valid */
2056 if (!ssl_next_proto_validate(data, size))
2058 *al = TLS1_AD_DECODE_ERROR;
2061 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2063 *al = TLS1_AD_INTERNAL_ERROR;
2066 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2067 if (!s->next_proto_negotiated)
2069 *al = TLS1_AD_INTERNAL_ERROR;
2072 memcpy(s->next_proto_negotiated, selected, selected_len);
2073 s->next_proto_negotiated_len = selected_len;
2074 s->s3->next_proto_neg_seen = 1;
2077 else if (type == TLSEXT_TYPE_renegotiate)
2079 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2081 renegotiate_seen = 1;
2083 #ifndef OPENSSL_NO_HEARTBEATS
2084 else if (type == TLSEXT_TYPE_heartbeat)
2088 case 0x01: /* Server allows us to send HB requests */
2089 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2091 case 0x02: /* Server doesn't accept HB requests */
2092 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2093 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2095 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2100 else if (type == TLSEXT_TYPE_use_srtp)
2102 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2107 else if (type == TLSEXT_TYPE_server_authz)
2109 /* We only support audit proofs. It's an error to send
2110 * an authz hello extension if the client
2111 * didn't request a proof. */
2112 unsigned char *sdata = data;
2113 unsigned char server_authz_dataformatlist_length;
2115 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2117 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2123 *al = TLS1_AD_DECODE_ERROR;
2127 server_authz_dataformatlist_length = *(sdata++);
2128 if (server_authz_dataformatlist_length != size - 1)
2130 *al = TLS1_AD_DECODE_ERROR;
2134 /* We only support audit proofs, so a legal ServerHello
2135 * authz list contains exactly one entry. */
2136 if (server_authz_dataformatlist_length != 1 ||
2137 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2139 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2143 s->s3->tlsext_authz_server_promised = 1;
2151 *al = SSL_AD_DECODE_ERROR;
2155 if (!s->hit && tlsext_servername == 1)
2157 if (s->tlsext_hostname)
2159 if (s->session->tlsext_hostname == NULL)
2161 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2162 if (!s->session->tlsext_hostname)
2164 *al = SSL_AD_UNRECOGNIZED_NAME;
2170 *al = SSL_AD_DECODE_ERROR;
2180 /* Determine if we need to see RI. Strictly speaking if we want to
2181 * avoid an attack we should *always* see RI even on initial server
2182 * hello because the client doesn't see any renegotiation during an
2183 * attack. However this would mean we could not connect to any server
2184 * which doesn't support RI so for the immediate future tolerate RI
2185 * absence on initial connect only.
2187 if (!renegotiate_seen
2188 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2189 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2191 *al = SSL_AD_HANDSHAKE_FAILURE;
2192 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2193 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2201 int ssl_prepare_clienthello_tlsext(SSL *s)
2204 #ifdef TLSEXT_TYPE_opaque_prf_input
2208 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2210 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2215 if (s->tlsext_opaque_prf_input != NULL)
2217 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2218 OPENSSL_free(s->s3->client_opaque_prf_input);
2220 if (s->tlsext_opaque_prf_input_len == 0)
2221 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2223 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2224 if (s->s3->client_opaque_prf_input == NULL)
2226 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2229 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2233 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2234 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2241 int ssl_prepare_serverhello_tlsext(SSL *s)
2243 #ifndef OPENSSL_NO_EC
2244 /* If we are server and using an ECC cipher suite, send the point formats we support
2245 * if the client sent us an ECPointsFormat extension. Note that the server is not
2246 * supposed to send an EllipticCurves extension.
2249 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2250 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2251 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2252 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2256 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2257 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2259 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2262 s->tlsext_ecpointformatlist_length = 3;
2263 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2264 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2265 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2267 #endif /* OPENSSL_NO_EC */
2272 static int ssl_check_clienthello_tlsext(SSL *s)
2274 int ret=SSL_TLSEXT_ERR_NOACK;
2275 int al = SSL_AD_UNRECOGNIZED_NAME;
2277 #ifndef OPENSSL_NO_EC
2278 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2279 * ssl3_choose_cipher in s3_lib.c.
2281 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2282 * ssl3_choose_cipher in s3_lib.c.
2286 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2287 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2288 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2289 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2291 /* If status request then ask callback what to do.
2292 * Note: this must be called after servername callbacks in case
2293 * the certificate has changed.
2295 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2298 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2301 /* We don't want to send a status request response */
2302 case SSL_TLSEXT_ERR_NOACK:
2303 s->tlsext_status_expected = 0;
2305 /* status request response should be sent */
2306 case SSL_TLSEXT_ERR_OK:
2307 if (s->tlsext_ocsp_resp)
2308 s->tlsext_status_expected = 1;
2310 s->tlsext_status_expected = 0;
2312 /* something bad happened */
2313 case SSL_TLSEXT_ERR_ALERT_FATAL:
2314 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2315 al = SSL_AD_INTERNAL_ERROR;
2320 s->tlsext_status_expected = 0;
2322 #ifdef TLSEXT_TYPE_opaque_prf_input
2324 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2325 * but we might be sending an alert in response to the client hello,
2326 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2330 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2332 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2335 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2336 al = SSL_AD_INTERNAL_ERROR;
2341 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2342 OPENSSL_free(s->s3->server_opaque_prf_input);
2343 s->s3->server_opaque_prf_input = NULL;
2345 if (s->tlsext_opaque_prf_input != NULL)
2347 if (s->s3->client_opaque_prf_input != NULL &&
2348 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2350 /* can only use this extension if we have a server opaque PRF input
2351 * of the same length as the client opaque PRF input! */
2353 if (s->tlsext_opaque_prf_input_len == 0)
2354 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2356 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2357 if (s->s3->server_opaque_prf_input == NULL)
2359 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2360 al = SSL_AD_INTERNAL_ERROR;
2363 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2367 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2369 /* The callback wants to enforce use of the extension,
2370 * but we can't do that with the client opaque PRF input;
2371 * abort the handshake.
2373 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2374 al = SSL_AD_HANDSHAKE_FAILURE;
2382 case SSL_TLSEXT_ERR_ALERT_FATAL:
2383 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2386 case SSL_TLSEXT_ERR_ALERT_WARNING:
2387 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2390 case SSL_TLSEXT_ERR_NOACK:
2391 s->servername_done=0;
2397 int ssl_check_serverhello_tlsext(SSL *s)
2399 int ret=SSL_TLSEXT_ERR_NOACK;
2400 int al = SSL_AD_UNRECOGNIZED_NAME;
2402 #ifndef OPENSSL_NO_EC
2403 /* If we are client and using an elliptic curve cryptography cipher
2404 * suite, then if server returns an EC point formats lists extension
2405 * it must contain uncompressed.
2407 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2408 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2409 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2410 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2411 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2413 /* we are using an ECC cipher */
2415 unsigned char *list;
2416 int found_uncompressed = 0;
2417 list = s->session->tlsext_ecpointformatlist;
2418 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2420 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2422 found_uncompressed = 1;
2426 if (!found_uncompressed)
2428 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2432 ret = SSL_TLSEXT_ERR_OK;
2433 #endif /* OPENSSL_NO_EC */
2435 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2436 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2437 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2438 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2440 #ifdef TLSEXT_TYPE_opaque_prf_input
2441 if (s->s3->server_opaque_prf_input_len > 0)
2443 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2444 * So first verify that we really have a value from the server too. */
2446 if (s->s3->server_opaque_prf_input == NULL)
2448 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2449 al = SSL_AD_HANDSHAKE_FAILURE;
2452 /* Anytime the server *has* sent an opaque PRF input, we need to check
2453 * that we have a client opaque PRF input of the same size. */
2454 if (s->s3->client_opaque_prf_input == NULL ||
2455 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2457 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2458 al = SSL_AD_ILLEGAL_PARAMETER;
2463 /* If we've requested certificate status and we wont get one
2466 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2467 && s->ctx && s->ctx->tlsext_status_cb)
2470 /* Set resp to NULL, resplen to -1 so callback knows
2471 * there is no response.
2473 if (s->tlsext_ocsp_resp)
2475 OPENSSL_free(s->tlsext_ocsp_resp);
2476 s->tlsext_ocsp_resp = NULL;
2478 s->tlsext_ocsp_resplen = -1;
2479 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2482 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2483 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2487 al = SSL_AD_INTERNAL_ERROR;
2488 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2494 case SSL_TLSEXT_ERR_ALERT_FATAL:
2495 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2498 case SSL_TLSEXT_ERR_ALERT_WARNING:
2499 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2502 case SSL_TLSEXT_ERR_NOACK:
2503 s->servername_done=0;
2509 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2512 if (s->version < SSL3_VERSION)
2514 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2516 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2520 if (ssl_check_serverhello_tlsext(s) <= 0)
2522 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2528 /* Since the server cache lookup is done early on in the processing of the
2529 * ClientHello, and other operations depend on the result, we need to handle
2530 * any TLS session ticket extension at the same time.
2532 * session_id: points at the session ID in the ClientHello. This code will
2533 * read past the end of this in order to parse out the session ticket
2534 * extension, if any.
2535 * len: the length of the session ID.
2536 * limit: a pointer to the first byte after the ClientHello.
2537 * ret: (output) on return, if a ticket was decrypted, then this is set to
2538 * point to the resulting session.
2540 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2541 * ciphersuite, in which case we have no use for session tickets and one will
2542 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2545 * -1: fatal error, either from parsing or decrypting the ticket.
2546 * 0: no ticket was found (or was ignored, based on settings).
2547 * 1: a zero length extension was found, indicating that the client supports
2548 * session tickets but doesn't currently have one to offer.
2549 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2550 * couldn't be decrypted because of a non-fatal error.
2551 * 3: a ticket was successfully decrypted and *ret was set.
2554 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2555 * a new session ticket to the client because the client indicated support
2556 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2557 * a session ticket or we couldn't use the one it gave us, or if
2558 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2559 * Otherwise, s->tlsext_ticket_expected is set to 0.
2561 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2562 const unsigned char *limit, SSL_SESSION **ret)
2564 /* Point after session ID in client hello */
2565 const unsigned char *p = session_id + len;
2569 s->tlsext_ticket_expected = 0;
2571 /* If tickets disabled behave as if no ticket present
2572 * to permit stateful resumption.
2574 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2576 if ((s->version <= SSL3_VERSION) || !limit)
2580 /* Skip past DTLS cookie */
2581 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2588 /* Skip past cipher list */
2593 /* Skip past compression algorithm list */
2598 /* Now at start of extensions */
2599 if ((p + 2) >= limit)
2602 while ((p + 4) <= limit)
2604 unsigned short type, size;
2607 if (p + size > limit)
2609 if (type == TLSEXT_TYPE_session_ticket)
2614 /* The client will accept a ticket but doesn't
2615 * currently have one. */
2616 s->tlsext_ticket_expected = 1;
2619 if (s->tls_session_secret_cb)
2621 /* Indicate that the ticket couldn't be
2622 * decrypted rather than generating the session
2623 * from ticket now, trigger abbreviated
2624 * handshake based on external mechanism to
2625 * calculate the master secret later. */
2628 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2631 case 2: /* ticket couldn't be decrypted */
2632 s->tlsext_ticket_expected = 1;
2634 case 3: /* ticket was decrypted */
2636 case 4: /* ticket decrypted but need to renew */
2637 s->tlsext_ticket_expected = 1;
2639 default: /* fatal error */
2648 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2650 * etick: points to the body of the session ticket extension.
2651 * eticklen: the length of the session tickets extenion.
2652 * sess_id: points at the session ID.
2653 * sesslen: the length of the session ID.
2654 * psess: (output) on return, if a ticket was decrypted, then this is set to
2655 * point to the resulting session.
2658 * -1: fatal error, either from parsing or decrypting the ticket.
2659 * 2: the ticket couldn't be decrypted.
2660 * 3: a ticket was successfully decrypted and *psess was set.
2661 * 4: same as 3, but the ticket needs to be renewed.
2663 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2664 const unsigned char *sess_id, int sesslen,
2665 SSL_SESSION **psess)
2668 unsigned char *sdec;
2669 const unsigned char *p;
2670 int slen, mlen, renew_ticket = 0;
2671 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2674 SSL_CTX *tctx = s->initial_ctx;
2675 /* Need at least keyname + iv + some encrypted data */
2678 /* Initialize session ticket encryption and HMAC contexts */
2679 HMAC_CTX_init(&hctx);
2680 EVP_CIPHER_CTX_init(&ctx);
2681 if (tctx->tlsext_ticket_key_cb)
2683 unsigned char *nctick = (unsigned char *)etick;
2684 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2695 /* Check key name matches */
2696 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2698 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2699 tlsext_tick_md(), NULL);
2700 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2701 tctx->tlsext_tick_aes_key, etick + 16);
2703 /* Attempt to process session ticket, first conduct sanity and
2704 * integrity checks on ticket.
2706 mlen = HMAC_size(&hctx);
2709 EVP_CIPHER_CTX_cleanup(&ctx);
2713 /* Check HMAC of encrypted ticket */
2714 HMAC_Update(&hctx, etick, eticklen);
2715 HMAC_Final(&hctx, tick_hmac, NULL);
2716 HMAC_CTX_cleanup(&hctx);
2717 if (memcmp(tick_hmac, etick + eticklen, mlen))
2719 /* Attempt to decrypt session data */
2720 /* Move p after IV to start of encrypted ticket, update length */
2721 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2722 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2723 sdec = OPENSSL_malloc(eticklen);
2726 EVP_CIPHER_CTX_cleanup(&ctx);
2729 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2730 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2733 EVP_CIPHER_CTX_cleanup(&ctx);
2736 sess = d2i_SSL_SESSION(NULL, &p, slen);
2740 /* The session ID, if non-empty, is used by some clients to
2741 * detect that the ticket has been accepted. So we copy it to
2742 * the session structure. If it is empty set length to zero
2743 * as required by standard.
2746 memcpy(sess->session_id, sess_id, sesslen);
2747 sess->session_id_length = sesslen;
2755 /* For session parse failure, indicate that we need to send a new
2760 /* Tables to translate from NIDs to TLS v1.2 ids */
2768 static tls12_lookup tls12_md[] = {
2769 {NID_md5, TLSEXT_hash_md5},
2770 {NID_sha1, TLSEXT_hash_sha1},
2771 {NID_sha224, TLSEXT_hash_sha224},
2772 {NID_sha256, TLSEXT_hash_sha256},
2773 {NID_sha384, TLSEXT_hash_sha384},
2774 {NID_sha512, TLSEXT_hash_sha512}
2777 static tls12_lookup tls12_sig[] = {
2778 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2779 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2780 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2783 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2786 for (i = 0; i < tlen; i++)
2788 if (table[i].nid == nid)
2794 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2797 for (i = 0; i < tlen; i++)
2799 if ((table[i].id) == id)
2800 return table[i].nid;
2805 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
2810 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2811 sizeof(tls12_md)/sizeof(tls12_lookup));
2814 sig_id = tls12_get_sigid(pk);
2817 p[0] = (unsigned char)md_id;
2818 p[1] = (unsigned char)sig_id;
2822 int tls12_get_sigid(const EVP_PKEY *pk)
2824 return tls12_find_id(pk->type, tls12_sig,
2825 sizeof(tls12_sig)/sizeof(tls12_lookup));
2828 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2832 #ifndef OPENSSL_NO_MD5
2833 case TLSEXT_hash_md5:
2840 #ifndef OPENSSL_NO_SHA
2841 case TLSEXT_hash_sha1:
2844 #ifndef OPENSSL_NO_SHA256
2845 case TLSEXT_hash_sha224:
2846 return EVP_sha224();
2848 case TLSEXT_hash_sha256:
2849 return EVP_sha256();
2851 #ifndef OPENSSL_NO_SHA512
2852 case TLSEXT_hash_sha384:
2853 return EVP_sha384();
2855 case TLSEXT_hash_sha512:
2856 return EVP_sha512();
2864 /* Set preferred digest for each key type */
2866 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
2871 TLS_SIGALGS *sigptr;
2872 /* Extension ignored for TLS versions below 1.2 */
2873 if (TLS1_get_version(s) < TLS1_2_VERSION)
2875 /* Should never happen */
2879 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2880 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2881 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2882 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2884 if (c->peer_sigalgs)
2885 OPENSSL_free(c->peer_sigalgs);
2886 c->peer_sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS));
2887 if (!c->peer_sigalgs)
2889 c->peer_sigalgslen = dsize/2;
2891 for (i = 0, sigptr = c->peer_sigalgs; i < dsize; i += 2, sigptr++)
2893 sigptr->rhash = data[i];
2894 sigptr->rsign = data[i + 1];
2895 sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md,
2896 sizeof(tls12_md)/sizeof(tls12_lookup));
2897 sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig,
2898 sizeof(tls12_sig)/sizeof(tls12_lookup));
2899 if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid,
2902 sigptr->signandhash_nid = NID_undef;
2903 switch(sigptr->rsign)
2905 #ifndef OPENSSL_NO_RSA
2906 case TLSEXT_signature_rsa:
2907 idx = SSL_PKEY_RSA_SIGN;
2910 #ifndef OPENSSL_NO_DSA
2911 case TLSEXT_signature_dsa:
2912 idx = SSL_PKEY_DSA_SIGN;
2915 #ifndef OPENSSL_NO_ECDSA
2916 case TLSEXT_signature_ecdsa:
2924 if (c->pkeys[idx].digest == NULL)
2926 md = tls12_get_hash(sigptr->rhash);
2929 c->pkeys[idx].digest = md;
2930 if (idx == SSL_PKEY_RSA_SIGN)
2931 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2938 /* Set any remaining keys to default values. NOTE: if alg is not
2939 * supported it stays as NULL.
2941 #ifndef OPENSSL_NO_DSA
2942 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2943 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
2945 #ifndef OPENSSL_NO_RSA
2946 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
2948 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2949 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2952 #ifndef OPENSSL_NO_ECDSA
2953 if (!c->pkeys[SSL_PKEY_ECC].digest)
2954 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
2961 int SSL_get_sigalgs(SSL *s, int idx,
2962 int *psign, int *phash, int *psignandhash,
2963 unsigned char *rsig, unsigned char *rhash)
2965 if (s->cert->peer_sigalgs == NULL)
2970 if (idx >= (int)s->cert->peer_sigalgslen)
2972 psig = s->cert->peer_sigalgs + idx;
2974 *psign = psig->sign_nid;
2976 *phash = psig->hash_nid;
2978 *psignandhash = psig->signandhash_nid;
2980 *rsig = psig->rsign;
2982 *rhash = psig->rhash;
2984 return s->cert->peer_sigalgslen;
2988 #ifndef OPENSSL_NO_HEARTBEATS
2990 tls1_process_heartbeat(SSL *s)
2992 unsigned char *p = &s->s3->rrec.data[0], *pl;
2993 unsigned short hbtype;
2994 unsigned int payload;
2995 unsigned int padding = 16; /* Use minimum padding */
2997 /* Read type and payload length first */
3002 if (s->msg_callback)
3003 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3004 &s->s3->rrec.data[0], s->s3->rrec.length,
3005 s, s->msg_callback_arg);
3007 if (hbtype == TLS1_HB_REQUEST)
3009 unsigned char *buffer, *bp;
3012 /* Allocate memory for the response, size is 1 bytes
3013 * message type, plus 2 bytes payload length, plus
3014 * payload, plus padding
3016 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3019 /* Enter response type, length and copy payload */
3020 *bp++ = TLS1_HB_RESPONSE;
3022 memcpy(bp, pl, payload);
3024 /* Random padding */
3025 RAND_pseudo_bytes(bp, padding);
3027 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3029 if (r >= 0 && s->msg_callback)
3030 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3031 buffer, 3 + payload + padding,
3032 s, s->msg_callback_arg);
3034 OPENSSL_free(buffer);
3039 else if (hbtype == TLS1_HB_RESPONSE)
3043 /* We only send sequence numbers (2 bytes unsigned int),
3044 * and 16 random bytes, so we just try to read the
3045 * sequence number */
3048 if (payload == 18 && seq == s->tlsext_hb_seq)
3051 s->tlsext_hb_pending = 0;
3059 tls1_heartbeat(SSL *s)
3061 unsigned char *buf, *p;
3063 unsigned int payload = 18; /* Sequence number + random bytes */
3064 unsigned int padding = 16; /* Use minimum padding */
3066 /* Only send if peer supports and accepts HB requests... */
3067 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3068 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3070 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3074 /* ...and there is none in flight yet... */
3075 if (s->tlsext_hb_pending)
3077 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3081 /* ...and no handshake in progress. */
3082 if (SSL_in_init(s) || s->in_handshake)
3084 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3088 /* Check if padding is too long, payload and padding
3089 * must not exceed 2^14 - 3 = 16381 bytes in total.
3091 OPENSSL_assert(payload + padding <= 16381);
3093 /* Create HeartBeat message, we just use a sequence number
3094 * as payload to distuingish different messages and add
3095 * some random stuff.
3096 * - Message Type, 1 byte
3097 * - Payload Length, 2 bytes (unsigned int)
3098 * - Payload, the sequence number (2 bytes uint)
3099 * - Payload, random bytes (16 bytes uint)
3102 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3105 *p++ = TLS1_HB_REQUEST;
3106 /* Payload length (18 bytes here) */
3108 /* Sequence number */
3109 s2n(s->tlsext_hb_seq, p);
3110 /* 16 random bytes */
3111 RAND_pseudo_bytes(p, 16);
3113 /* Random padding */
3114 RAND_pseudo_bytes(p, padding);
3116 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3119 if (s->msg_callback)
3120 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3121 buf, 3 + payload + padding,
3122 s, s->msg_callback_arg);
3124 s->tlsext_hb_pending = 1;
3133 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num *2)
3138 int sigalgs[MAX_SIGALGLEN];
3141 static int sig_cb(const char *elem, int len, void *arg)
3143 sig_cb_st *sarg = arg;
3146 int sig_alg, hash_alg;
3147 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3149 if (len > (int)(sizeof(etmp) - 1))
3151 memcpy(etmp, elem, len);
3153 p = strchr(etmp, '+');
3161 if (!strcmp(etmp, "RSA"))
3162 sig_alg = EVP_PKEY_RSA;
3163 else if (!strcmp(etmp, "DSA"))
3164 sig_alg = EVP_PKEY_DSA;
3165 else if (!strcmp(etmp, "ECDSA"))
3166 sig_alg = EVP_PKEY_EC;
3169 hash_alg = OBJ_sn2nid(p);
3170 if (hash_alg == NID_undef)
3171 hash_alg = OBJ_ln2nid(p);
3172 if (hash_alg == NID_undef)
3175 for (i = 0; i < sarg->sigalgcnt; i+=2)
3177 if (sarg->sigalgs[i] == sig_alg
3178 && sarg->sigalgs[i + 1] == hash_alg)
3181 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3182 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3186 /* Set suppored signature algorithms based on a colon separated list
3187 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3188 int tls1_set_sigalgs_list(CERT *c, const char *str)
3192 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3194 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt);
3197 int tls1_set_sigalgs(CERT *c, const int *salg, size_t salglen)
3199 TLS_SIGALGS *sigalgs, *sptr;
3205 sigalgs = OPENSSL_malloc(sizeof(TLS_SIGALGS) * salglen);
3206 if (sigalgs == NULL)
3208 for (i = 0, sptr = sigalgs; i < salglen; i++, sptr++)
3210 sptr->hash_nid = *salg++;
3211 sptr->sign_nid = *salg++;
3212 rhash = tls12_find_id(sptr->hash_nid, tls12_md,
3213 sizeof(tls12_md)/sizeof(tls12_lookup));
3214 rsign = tls12_find_id(sptr->sign_nid, tls12_sig,
3215 sizeof(tls12_sig)/sizeof(tls12_lookup));
3217 if (rhash == -1 || rsign == -1)
3220 if (!OBJ_find_sigid_by_algs(&sptr->signandhash_nid,
3223 sptr->signandhash_nid = NID_undef;
3224 sptr->rhash = rhash;
3225 sptr->rsign = rsign;
3228 if (c->conf_sigalgs)
3229 OPENSSL_free(c->conf_sigalgs);
3231 c->conf_sigalgs = sigalgs;
3232 c->conf_sigalgslen = salglen;
3236 OPENSSL_free(sigalgs);