2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include <openssl/ocsp.h>
117 #include <openssl/rand.h>
118 #include "ssl_locl.h"
120 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
122 #ifndef OPENSSL_NO_TLSEXT
123 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
124 const unsigned char *sess_id, int sesslen,
125 SSL_SESSION **psess);
126 static int ssl_check_clienthello_tlsext_early(SSL *s);
127 int ssl_check_serverhello_tlsext(SSL *s);
130 SSL3_ENC_METHOD TLSv1_enc_data={
133 tls1_setup_key_block,
134 tls1_generate_master_secret,
135 tls1_change_cipher_state,
136 tls1_final_finish_mac,
137 TLS1_FINISH_MAC_LENGTH,
138 tls1_cert_verify_mac,
139 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
140 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
142 tls1_export_keying_material,
145 long tls1_default_timeout(void)
147 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
148 * is way too long for http, the cache would over fill */
154 if (!ssl3_new(s)) return(0);
155 s->method->ssl_clear(s);
159 void tls1_free(SSL *s)
161 #ifndef OPENSSL_NO_TLSEXT
162 if (s->tlsext_session_ticket)
164 OPENSSL_free(s->tlsext_session_ticket);
166 #endif /* OPENSSL_NO_TLSEXT */
170 void tls1_clear(SSL *s)
173 s->version = s->method->version;
176 #ifndef OPENSSL_NO_EC
178 static int nid_list[] =
180 NID_sect163k1, /* sect163k1 (1) */
181 NID_sect163r1, /* sect163r1 (2) */
182 NID_sect163r2, /* sect163r2 (3) */
183 NID_sect193r1, /* sect193r1 (4) */
184 NID_sect193r2, /* sect193r2 (5) */
185 NID_sect233k1, /* sect233k1 (6) */
186 NID_sect233r1, /* sect233r1 (7) */
187 NID_sect239k1, /* sect239k1 (8) */
188 NID_sect283k1, /* sect283k1 (9) */
189 NID_sect283r1, /* sect283r1 (10) */
190 NID_sect409k1, /* sect409k1 (11) */
191 NID_sect409r1, /* sect409r1 (12) */
192 NID_sect571k1, /* sect571k1 (13) */
193 NID_sect571r1, /* sect571r1 (14) */
194 NID_secp160k1, /* secp160k1 (15) */
195 NID_secp160r1, /* secp160r1 (16) */
196 NID_secp160r2, /* secp160r2 (17) */
197 NID_secp192k1, /* secp192k1 (18) */
198 NID_X9_62_prime192v1, /* secp192r1 (19) */
199 NID_secp224k1, /* secp224k1 (20) */
200 NID_secp224r1, /* secp224r1 (21) */
201 NID_secp256k1, /* secp256k1 (22) */
202 NID_X9_62_prime256v1, /* secp256r1 (23) */
203 NID_secp384r1, /* secp384r1 (24) */
204 NID_secp521r1 /* secp521r1 (25) */
208 static const unsigned char ecformats_default[] =
210 TLSEXT_ECPOINTFORMAT_uncompressed,
211 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
212 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
215 static const unsigned char eccurves_default[] =
217 0,14, /* sect571r1 (14) */
218 0,13, /* sect571k1 (13) */
219 0,25, /* secp521r1 (25) */
220 0,11, /* sect409k1 (11) */
221 0,12, /* sect409r1 (12) */
222 0,24, /* secp384r1 (24) */
223 0,9, /* sect283k1 (9) */
224 0,10, /* sect283r1 (10) */
225 0,22, /* secp256k1 (22) */
226 0,23, /* secp256r1 (23) */
227 0,8, /* sect239k1 (8) */
228 0,6, /* sect233k1 (6) */
229 0,7, /* sect233r1 (7) */
230 0,20, /* secp224k1 (20) */
231 0,21, /* secp224r1 (21) */
232 0,4, /* sect193r1 (4) */
233 0,5, /* sect193r2 (5) */
234 0,18, /* secp192k1 (18) */
235 0,19, /* secp192r1 (19) */
236 0,1, /* sect163k1 (1) */
237 0,2, /* sect163r1 (2) */
238 0,3, /* sect163r2 (3) */
239 0,15, /* secp160k1 (15) */
240 0,16, /* secp160r1 (16) */
241 0,17, /* secp160r2 (17) */
244 int tls1_ec_curve_id2nid(int curve_id)
246 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
247 if ((curve_id < 1) || ((unsigned int)curve_id >
248 sizeof(nid_list)/sizeof(nid_list[0])))
250 return nid_list[curve_id-1];
253 int tls1_ec_nid2curve_id(int nid)
255 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
258 case NID_sect163k1: /* sect163k1 (1) */
260 case NID_sect163r1: /* sect163r1 (2) */
262 case NID_sect163r2: /* sect163r2 (3) */
264 case NID_sect193r1: /* sect193r1 (4) */
266 case NID_sect193r2: /* sect193r2 (5) */
268 case NID_sect233k1: /* sect233k1 (6) */
270 case NID_sect233r1: /* sect233r1 (7) */
272 case NID_sect239k1: /* sect239k1 (8) */
274 case NID_sect283k1: /* sect283k1 (9) */
276 case NID_sect283r1: /* sect283r1 (10) */
278 case NID_sect409k1: /* sect409k1 (11) */
280 case NID_sect409r1: /* sect409r1 (12) */
282 case NID_sect571k1: /* sect571k1 (13) */
284 case NID_sect571r1: /* sect571r1 (14) */
286 case NID_secp160k1: /* secp160k1 (15) */
288 case NID_secp160r1: /* secp160r1 (16) */
290 case NID_secp160r2: /* secp160r2 (17) */
292 case NID_secp192k1: /* secp192k1 (18) */
294 case NID_X9_62_prime192v1: /* secp192r1 (19) */
296 case NID_secp224k1: /* secp224k1 (20) */
298 case NID_secp224r1: /* secp224r1 (21) */
300 case NID_secp256k1: /* secp256k1 (22) */
302 case NID_X9_62_prime256v1: /* secp256r1 (23) */
304 case NID_secp384r1: /* secp384r1 (24) */
306 case NID_secp521r1: /* secp521r1 (25) */
312 /* Get curves list, if "sess" is set return client curves otherwise
315 static void tls1_get_curvelist(SSL *s, int sess,
316 const unsigned char **pcurves,
321 *pcurves = s->session->tlsext_ellipticcurvelist;
322 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
326 *pcurves = s->tlsext_ellipticcurvelist;
327 *pcurveslen = s->tlsext_ellipticcurvelist_length;
329 /* If not set use default: for now static structure */
332 *pcurves = eccurves_default;
333 *pcurveslen = sizeof(eccurves_default);
336 /* Check a curve is one of our preferences */
337 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
339 const unsigned char *curves;
341 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
343 tls1_get_curvelist(s, 0, &curves, &curveslen);
344 for (i = 0; i < curveslen; i += 2, curves += 2)
346 if (p[1] == curves[0] && p[2] == curves[1])
352 /* Return nth shared curve. If nmatch == -1 return number of
356 int tls1_shared_curve(SSL *s, int nmatch)
358 const unsigned char *pref, *supp;
359 size_t preflen, supplen, i, j;
361 /* Can't do anything on client side */
364 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
366 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
371 for (i = 0; i < preflen; i++, pref+=2)
373 const unsigned char *tsupp = supp;
374 for (j = 0; j < supplen; j++, tsupp+=2)
376 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
380 int id = (pref[0] << 8) | pref[1];
381 return tls1_ec_curve_id2nid(id);
392 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
393 int *curves, size_t ncurves)
395 unsigned char *clist, *p;
397 /* Bitmap of curves included to detect duplicates: only works
398 * while curve ids < 32
400 unsigned long dup_list = 0;
401 clist = OPENSSL_malloc(ncurves * 2);
404 for (i = 0, p = clist; i < ncurves; i++)
406 unsigned long idmask;
408 id = tls1_ec_nid2curve_id(curves[i]);
410 if (!id || (dup_list & idmask))
421 *pextlen = ncurves * 2;
425 #define MAX_CURVELIST 25
430 int nid_arr[MAX_CURVELIST];
433 static int nid_cb(const char *elem, int len, void *arg)
435 nid_cb_st *narg = arg;
439 if (narg->nidcnt == MAX_CURVELIST)
441 if (len > (int)(sizeof(etmp) - 1))
443 memcpy(etmp, elem, len);
445 nid = EC_curve_nist2nid(etmp);
446 if (nid == NID_undef)
447 nid = OBJ_sn2nid(etmp);
448 if (nid == NID_undef)
449 nid = OBJ_ln2nid(etmp);
450 if (nid == NID_undef)
452 for (i = 0; i < narg->nidcnt; i++)
453 if (narg->nid_arr[i] == nid)
455 narg->nid_arr[narg->nidcnt++] = nid;
458 /* Set curves based on a colon separate list */
459 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
464 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
466 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
468 /* For an EC key set TLS id and required compression based on parameters */
469 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
475 const EC_METHOD *meth;
478 /* Determine if it is a prime field */
479 grp = EC_KEY_get0_group(ec);
480 pt = EC_KEY_get0_public_key(ec);
483 meth = EC_GROUP_method_of(grp);
486 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
490 /* Determine curve ID */
491 id = EC_GROUP_get_curve_name(grp);
492 id = tls1_ec_nid2curve_id(id);
493 /* If we have an ID set it, otherwise set arbitrary explicit curve */
497 curve_id[1] = (unsigned char)id;
509 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
512 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
514 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
517 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
521 /* Check an EC key is compatible with extensions */
522 static int tls1_check_ec_key(SSL *s,
523 unsigned char *curve_id, unsigned char *comp_id)
525 const unsigned char *p;
528 /* If point formats extension present check it, otherwise everything
529 * is supported (see RFC4492).
531 if (comp_id && s->session->tlsext_ecpointformatlist)
533 p = s->session->tlsext_ecpointformatlist;
534 plen = s->session->tlsext_ecpointformatlist_length;
535 for (i = 0; i < plen; i++, p++)
543 /* Check curve is consistent with client and server preferences */
544 for (j = 0; j <= 1; j++)
546 tls1_get_curvelist(s, j, &p, &plen);
547 for (i = 0; i < plen; i+=2, p+=2)
549 if (p[0] == curve_id[0] && p[1] == curve_id[1])
558 /* Check cert parameters compatible with extensions: currently just checks
559 * EC certificates have compatible curves and compression.
561 static int tls1_check_cert_param(SSL *s, X509 *x)
563 unsigned char comp_id, curve_id[2];
566 pkey = X509_get_pubkey(x);
569 /* If not EC nothing to do */
570 if (pkey->type != EVP_PKEY_EC)
575 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
579 return tls1_check_ec_key(s, curve_id, &comp_id);
581 /* Check EC temporary key is compatible with client extensions */
582 int tls1_check_ec_tmp_key(SSL *s)
584 unsigned char curve_id[2];
585 EC_KEY *ec = s->cert->ecdh_tmp;
586 if (s->cert->ecdh_tmp_auto)
588 /* Need a shared curve */
589 if (tls1_shared_curve(s, 0))
595 if (s->cert->ecdh_tmp_cb)
600 if (!tls1_set_ec_id(curve_id, NULL, ec))
602 /* Set this to allow use of invalid curves for testing */
606 return tls1_check_ec_key(s, curve_id, NULL);
610 #endif /* OPENSSL_NO_EC */
612 #ifndef OPENSSL_NO_TLSEXT
614 /* List of supported signature algorithms and hashes. Should make this
615 * customisable at some point, for now include everything we support.
618 #ifdef OPENSSL_NO_RSA
619 #define tlsext_sigalg_rsa(md) /* */
621 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
624 #ifdef OPENSSL_NO_DSA
625 #define tlsext_sigalg_dsa(md) /* */
627 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
630 #ifdef OPENSSL_NO_ECDSA
631 #define tlsext_sigalg_ecdsa(md) /* */
633 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
636 #define tlsext_sigalg(md) \
637 tlsext_sigalg_rsa(md) \
638 tlsext_sigalg_dsa(md) \
639 tlsext_sigalg_ecdsa(md)
641 static unsigned char tls12_sigalgs[] = {
642 #ifndef OPENSSL_NO_SHA512
643 tlsext_sigalg(TLSEXT_hash_sha512)
644 tlsext_sigalg(TLSEXT_hash_sha384)
646 #ifndef OPENSSL_NO_SHA256
647 tlsext_sigalg(TLSEXT_hash_sha256)
648 tlsext_sigalg(TLSEXT_hash_sha224)
650 #ifndef OPENSSL_NO_SHA
651 tlsext_sigalg(TLSEXT_hash_sha1)
653 #ifndef OPENSSL_NO_MD5
654 tlsext_sigalg_rsa(TLSEXT_hash_md5)
658 size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
660 /* If server use client authentication sigalgs if not NULL */
661 if (s->server && s->cert->client_sigalgs)
663 *psigs = s->cert->client_sigalgs;
664 return s->cert->client_sigalgslen;
666 else if (s->cert->conf_sigalgs)
668 *psigs = s->cert->conf_sigalgs;
669 return s->cert->conf_sigalgslen;
673 *psigs = tls12_sigalgs;
675 /* If FIPS mode don't include MD5 which is last */
677 return sizeof(tls12_sigalgs) - 2;
680 return sizeof(tls12_sigalgs);
683 /* Check signature algorithm is consistent with sent supported signature
684 * algorithms and if so return relevant digest.
686 int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
687 const unsigned char *sig, EVP_PKEY *pkey)
689 const unsigned char *sent_sigs;
690 size_t sent_sigslen, i;
691 int sigalg = tls12_get_sigid(pkey);
692 /* Should never happen */
695 /* Check key type is consistent with signature */
696 if (sigalg != (int)sig[1])
698 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
701 /* Check signature matches a type we sent */
702 sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
703 for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
705 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
708 /* Allow fallback to SHA1 if not strict mode */
709 if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT))
711 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
714 *pmd = tls12_get_hash(sig[0]);
717 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
722 /* Get a mask of disabled algorithms: an algorithm is disabled
723 * if it isn't supported or doesn't appear in supported signature
724 * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
725 * session and not global settings.
728 void ssl_set_client_disabled(SSL *s)
731 const unsigned char *sigalgs;
732 size_t i, sigalgslen;
733 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
736 /* If less than TLS 1.2 don't allow TLS 1.2 only ciphers */
737 if (TLS1_get_version(s) < TLS1_2_VERSION)
738 c->mask_ssl = SSL_TLSV1_2;
741 /* Now go through all signature algorithms seeing if we support
742 * any for RSA, DSA, ECDSA. Do this for all versions not just
745 sigalgslen = tls12_get_psigalgs(s, &sigalgs);
746 for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
750 #ifndef OPENSSL_NO_RSA
751 case TLSEXT_signature_rsa:
755 #ifndef OPENSSL_NO_DSA
756 case TLSEXT_signature_dsa:
760 #ifndef OPENSSL_NO_ECDSA
761 case TLSEXT_signature_ecdsa:
767 /* Disable auth and static DH if we don't include any appropriate
768 * signature algorithms.
772 c->mask_a |= SSL_aRSA;
773 c->mask_k |= SSL_kDHr|SSL_kECDHr;
777 c->mask_a |= SSL_aDSS;
778 c->mask_k |= SSL_kDHd;
782 c->mask_a |= SSL_aECDSA;
783 c->mask_k |= SSL_kECDHe;
785 #ifndef OPENSSL_NO_KRB5
786 if (!kssl_tgt_is_available(s->kssl_ctx))
788 c->mask_a |= SSL_aKRB5;
789 c->mask_k |= SSL_kKRB5;
792 #ifndef OPENSSL_NO_PSK
793 /* with PSK there must be client callback set */
794 if (!s->psk_client_callback)
796 c->mask_a |= SSL_aPSK;
797 c->mask_k |= SSL_kPSK;
799 #endif /* OPENSSL_NO_PSK */
803 /* byte_compare is a compare function for qsort(3) that compares bytes. */
804 static int byte_compare(const void *in_a, const void *in_b)
806 unsigned char a = *((const unsigned char*) in_a);
807 unsigned char b = *((const unsigned char*) in_b);
816 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
819 unsigned char *ret = p;
820 #ifndef OPENSSL_NO_EC
821 /* See if we support any ECC ciphersuites */
823 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
826 unsigned long alg_k, alg_a;
827 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
829 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
831 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
833 alg_k = c->algorithm_mkey;
834 alg_a = c->algorithm_auth;
835 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
836 || (alg_a & SSL_aECDSA)))
845 /* don't add extensions for SSLv3 unless doing secure renegotiation */
846 if (s->client_version == SSL3_VERSION
847 && !s->s3->send_connection_binding)
852 if (ret>=limit) return NULL; /* this really never occurs, but ... */
854 if (s->tlsext_hostname != NULL)
856 /* Add TLS extension servername to the Client Hello message */
857 unsigned long size_str;
860 /* check for enough space.
861 4 for the servername type and entension length
862 2 for servernamelist length
863 1 for the hostname type
864 2 for hostname length
868 if ((lenmax = limit - ret - 9) < 0
869 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
872 /* extension type and length */
873 s2n(TLSEXT_TYPE_server_name,ret);
876 /* length of servername list */
879 /* hostname type, length and hostname */
880 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
882 memcpy(ret, s->tlsext_hostname, size_str);
886 /* Add RI if renegotiating */
891 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
893 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
897 if((limit - p - 4 - el) < 0) return NULL;
899 s2n(TLSEXT_TYPE_renegotiate,ret);
902 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
904 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
911 #ifndef OPENSSL_NO_SRP
912 /* Add SRP username if there is one */
913 if (s->srp_ctx.login != NULL)
914 { /* Add TLS extension SRP username to the Client Hello message */
916 int login_len = strlen(s->srp_ctx.login);
917 if (login_len > 255 || login_len == 0)
919 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
923 /* check for enough space.
924 4 for the srp type type and entension length
925 1 for the srp user identity
926 + srp user identity length
928 if ((limit - ret - 5 - login_len) < 0) return NULL;
930 /* fill in the extension */
931 s2n(TLSEXT_TYPE_srp,ret);
932 s2n(login_len+1,ret);
933 (*ret++) = (unsigned char) login_len;
934 memcpy(ret, s->srp_ctx.login, login_len);
939 #ifndef OPENSSL_NO_EC
942 /* Add TLS extension ECPointFormats to the ClientHello message */
944 const unsigned char *plist;
946 /* If we have a custom point format list use it otherwise
948 plist = s->tlsext_ecpointformatlist;
950 plistlen = s->tlsext_ecpointformatlist_length;
953 plist = ecformats_default;
954 plistlen = sizeof(ecformats_default);
957 if ((lenmax = limit - ret - 5) < 0) return NULL;
958 if (plistlen > (size_t)lenmax) return NULL;
961 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
965 s2n(TLSEXT_TYPE_ec_point_formats,ret);
966 s2n(plistlen + 1,ret);
967 *(ret++) = (unsigned char)plistlen ;
968 memcpy(ret, plist, plistlen);
971 /* Add TLS extension EllipticCurves to the ClientHello message */
972 plist = s->tlsext_ellipticcurvelist;
973 tls1_get_curvelist(s, 0, &plist, &plistlen);
975 if ((lenmax = limit - ret - 6) < 0) return NULL;
976 if (plistlen > (size_t)lenmax) return NULL;
977 if (plistlen > 65532)
979 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
983 s2n(TLSEXT_TYPE_elliptic_curves,ret);
984 s2n(plistlen + 2, ret);
986 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
987 * elliptic_curve_list, but the examples use two bytes.
988 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
989 * resolves this to two bytes.
992 memcpy(ret, plist, plistlen);
995 #endif /* OPENSSL_NO_EC */
997 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
1000 if (!s->new_session && s->session && s->session->tlsext_tick)
1001 ticklen = s->session->tlsext_ticklen;
1002 else if (s->session && s->tlsext_session_ticket &&
1003 s->tlsext_session_ticket->data)
1005 ticklen = s->tlsext_session_ticket->length;
1006 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1007 if (!s->session->tlsext_tick)
1009 memcpy(s->session->tlsext_tick,
1010 s->tlsext_session_ticket->data,
1012 s->session->tlsext_ticklen = ticklen;
1016 if (ticklen == 0 && s->tlsext_session_ticket &&
1017 s->tlsext_session_ticket->data == NULL)
1019 /* Check for enough room 2 for extension type, 2 for len
1022 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
1023 s2n(TLSEXT_TYPE_session_ticket,ret);
1027 memcpy(ret, s->session->tlsext_tick, ticklen);
1033 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
1036 const unsigned char *salg;
1037 salglen = tls12_get_psigalgs(s, &salg);
1038 if ((size_t)(limit - ret) < salglen + 6)
1040 s2n(TLSEXT_TYPE_signature_algorithms,ret);
1041 s2n(salglen + 2, ret);
1043 memcpy(ret, salg, salglen);
1047 #ifdef TLSEXT_TYPE_opaque_prf_input
1048 if (s->s3->client_opaque_prf_input != NULL &&
1049 s->version != DTLS1_VERSION)
1051 size_t col = s->s3->client_opaque_prf_input_len;
1053 if ((long)(limit - ret - 6 - col < 0))
1055 if (col > 0xFFFD) /* can't happen */
1058 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1061 memcpy(ret, s->s3->client_opaque_prf_input, col);
1066 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
1067 s->version != DTLS1_VERSION)
1070 long extlen, idlen, itmp;
1074 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1076 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1077 itmp = i2d_OCSP_RESPID(id, NULL);
1083 if (s->tlsext_ocsp_exts)
1085 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1092 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1093 s2n(TLSEXT_TYPE_status_request, ret);
1094 if (extlen + idlen > 0xFFF0)
1096 s2n(extlen + idlen + 5, ret);
1097 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1099 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1101 /* save position of id len */
1102 unsigned char *q = ret;
1103 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1104 /* skip over id len */
1106 itmp = i2d_OCSP_RESPID(id, &ret);
1112 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1115 #ifndef OPENSSL_NO_HEARTBEATS
1116 /* Add Heartbeat extension */
1117 s2n(TLSEXT_TYPE_heartbeat,ret);
1120 * 1: peer may send requests
1121 * 2: peer not allowed to send requests
1123 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1124 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1126 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1129 #ifndef OPENSSL_NO_NEXTPROTONEG
1130 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1132 /* The client advertises an emtpy extension to indicate its
1133 * support for Next Protocol Negotiation */
1134 if (limit - ret - 4 < 0)
1136 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1141 if(SSL_get_srtp_profiles(s))
1145 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1147 if((limit - p - 4 - el) < 0) return NULL;
1149 s2n(TLSEXT_TYPE_use_srtp,ret);
1152 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1154 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1160 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1161 /* 2 bytes for extension type */
1162 /* 2 bytes for extension length */
1163 /* 1 byte for the list length */
1164 /* 1 byte for the list (we only support audit proofs) */
1165 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1168 const unsigned short ext_len = 2;
1169 const unsigned char list_len = 1;
1171 if ((lenmax = limit - ret - 6) < 0) return NULL;
1173 s2n(TLSEXT_TYPE_server_authz, ret);
1174 /* Extension length: 2 bytes */
1176 *(ret++) = list_len;
1177 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1180 if ((extdatalen = ret-p-2) == 0)
1187 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1190 unsigned char *ret = p;
1191 #ifndef OPENSSL_NO_NEXTPROTONEG
1192 int next_proto_neg_seen;
1195 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1196 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1200 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1202 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1204 if ((long)(limit - ret - 4) < 0) return NULL;
1206 s2n(TLSEXT_TYPE_server_name,ret);
1210 if(s->s3->send_connection_binding)
1214 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1216 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1220 if((limit - p - 4 - el) < 0) return NULL;
1222 s2n(TLSEXT_TYPE_renegotiate,ret);
1225 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1227 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1234 #ifndef OPENSSL_NO_EC
1235 if (s->tlsext_ecpointformatlist != NULL &&
1236 s->version != DTLS1_VERSION)
1238 /* Add TLS extension ECPointFormats to the ServerHello message */
1241 if ((lenmax = limit - ret - 5) < 0) return NULL;
1242 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
1243 if (s->tlsext_ecpointformatlist_length > 255)
1245 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1249 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1250 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1251 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1252 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1253 ret+=s->tlsext_ecpointformatlist_length;
1256 /* Currently the server should not respond with a SupportedCurves extension */
1257 #endif /* OPENSSL_NO_EC */
1259 if (s->tlsext_ticket_expected
1260 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1262 if ((long)(limit - ret - 4) < 0) return NULL;
1263 s2n(TLSEXT_TYPE_session_ticket,ret);
1267 if (s->tlsext_status_expected)
1269 if ((long)(limit - ret - 4) < 0) return NULL;
1270 s2n(TLSEXT_TYPE_status_request,ret);
1274 #ifdef TLSEXT_TYPE_opaque_prf_input
1275 if (s->s3->server_opaque_prf_input != NULL &&
1276 s->version != DTLS1_VERSION)
1278 size_t sol = s->s3->server_opaque_prf_input_len;
1280 if ((long)(limit - ret - 6 - sol) < 0)
1282 if (sol > 0xFFFD) /* can't happen */
1285 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1288 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1297 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1299 if((limit - p - 4 - el) < 0) return NULL;
1301 s2n(TLSEXT_TYPE_use_srtp,ret);
1304 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1306 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1312 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1313 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1314 { const unsigned char cryptopro_ext[36] = {
1315 0xfd, 0xe8, /*65000*/
1316 0x00, 0x20, /*32 bytes length*/
1317 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1318 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1319 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1320 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1321 if (limit-ret<36) return NULL;
1322 memcpy(ret,cryptopro_ext,36);
1327 #ifndef OPENSSL_NO_HEARTBEATS
1328 /* Add Heartbeat extension if we've received one */
1329 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1331 s2n(TLSEXT_TYPE_heartbeat,ret);
1334 * 1: peer may send requests
1335 * 2: peer not allowed to send requests
1337 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1338 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1340 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1345 #ifndef OPENSSL_NO_NEXTPROTONEG
1346 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1347 s->s3->next_proto_neg_seen = 0;
1348 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1350 const unsigned char *npa;
1351 unsigned int npalen;
1354 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1355 if (r == SSL_TLSEXT_ERR_OK)
1357 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1358 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1360 memcpy(ret, npa, npalen);
1362 s->s3->next_proto_neg_seen = 1;
1367 /* If the client supports authz then see whether we have any to offer
1369 if (s->s3->tlsext_authz_client_types_len)
1371 size_t authz_length;
1372 /* By now we already know the new cipher, so we can look ahead
1373 * to see whether the cert we are going to send
1374 * has any authz data attached to it. */
1375 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1376 const unsigned char* const orig_authz = authz;
1378 unsigned authz_count = 0;
1380 /* The authz data contains a number of the following structures:
1381 * uint8_t authz_type
1383 * uint8_t data[length]
1385 * First we walk over it to find the number of authz elements. */
1386 for (i = 0; i < authz_length; i++)
1388 unsigned short length;
1392 if (memchr(s->s3->tlsext_authz_client_types,
1394 s->s3->tlsext_authz_client_types_len) != NULL)
1398 /* n2s increments authz by 2 */
1406 /* Add TLS extension server_authz to the ServerHello message
1407 * 2 bytes for extension type
1408 * 2 bytes for extension length
1409 * 1 byte for the list length
1410 * n bytes for the list */
1411 const unsigned short ext_len = 1 + authz_count;
1413 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1414 s2n(TLSEXT_TYPE_server_authz, ret);
1416 *(ret++) = authz_count;
1417 s->s3->tlsext_authz_promised_to_client = 1;
1421 for (i = 0; i < authz_length; i++)
1423 unsigned short length;
1428 if (memchr(s->s3->tlsext_authz_client_types,
1430 s->s3->tlsext_authz_client_types_len) != NULL)
1433 /* n2s increments authz by 2 */
1440 if ((extdatalen = ret-p-2)== 0)
1447 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1449 unsigned short type;
1450 unsigned short size;
1452 unsigned char *data = *p;
1453 int renegotiate_seen = 0;
1455 s->servername_done = 0;
1456 s->tlsext_status_type = -1;
1457 #ifndef OPENSSL_NO_NEXTPROTONEG
1458 s->s3->next_proto_neg_seen = 0;
1461 #ifndef OPENSSL_NO_HEARTBEATS
1462 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1463 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1465 /* Clear any signature algorithms extension received */
1466 if (s->cert->peer_sigalgs)
1468 OPENSSL_free(s->cert->peer_sigalgs);
1469 s->cert->peer_sigalgs = NULL;
1471 /* Clear any shared sigtnature algorithms */
1472 if (s->cert->shared_sigalgs)
1474 OPENSSL_free(s->cert->shared_sigalgs);
1475 s->cert->shared_sigalgs = NULL;
1478 if (data >= (d+n-2))
1482 if (data > (d+n-len))
1485 while (data <= (d+n-4))
1490 if (data+size > (d+n))
1493 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1495 if (s->tlsext_debug_cb)
1496 s->tlsext_debug_cb(s, 0, type, data, size,
1497 s->tlsext_debug_arg);
1498 /* The servername extension is treated as follows:
1500 - Only the hostname type is supported with a maximum length of 255.
1501 - The servername is rejected if too long or if it contains zeros,
1502 in which case an fatal alert is generated.
1503 - The servername field is maintained together with the session cache.
1504 - When a session is resumed, the servername call back invoked in order
1505 to allow the application to position itself to the right context.
1506 - The servername is acknowledged if it is new for a session or when
1507 it is identical to a previously used for the same session.
1508 Applications can control the behaviour. They can at any time
1509 set a 'desirable' servername for a new SSL object. This can be the
1510 case for example with HTTPS when a Host: header field is received and
1511 a renegotiation is requested. In this case, a possible servername
1512 presented in the new client hello is only acknowledged if it matches
1513 the value of the Host: field.
1514 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1515 if they provide for changing an explicit servername context for the session,
1516 i.e. when the session has been established with a servername extension.
1517 - On session reconnect, the servername extension may be absent.
1521 if (type == TLSEXT_TYPE_server_name)
1523 unsigned char *sdata;
1529 *al = SSL_AD_DECODE_ERROR;
1536 *al = SSL_AD_DECODE_ERROR;
1543 servname_type = *(sdata++);
1549 *al = SSL_AD_DECODE_ERROR;
1552 if (s->servername_done == 0)
1553 switch (servname_type)
1555 case TLSEXT_NAMETYPE_host_name:
1558 if(s->session->tlsext_hostname)
1560 *al = SSL_AD_DECODE_ERROR;
1563 if (len > TLSEXT_MAXLEN_host_name)
1565 *al = TLS1_AD_UNRECOGNIZED_NAME;
1568 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1570 *al = TLS1_AD_INTERNAL_ERROR;
1573 memcpy(s->session->tlsext_hostname, sdata, len);
1574 s->session->tlsext_hostname[len]='\0';
1575 if (strlen(s->session->tlsext_hostname) != len) {
1576 OPENSSL_free(s->session->tlsext_hostname);
1577 s->session->tlsext_hostname = NULL;
1578 *al = TLS1_AD_UNRECOGNIZED_NAME;
1581 s->servername_done = 1;
1585 s->servername_done = s->session->tlsext_hostname
1586 && strlen(s->session->tlsext_hostname) == len
1587 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
1599 *al = SSL_AD_DECODE_ERROR;
1604 #ifndef OPENSSL_NO_SRP
1605 else if (type == TLSEXT_TYPE_srp)
1607 if (size <= 0 || ((len = data[0])) != (size -1))
1609 *al = SSL_AD_DECODE_ERROR;
1612 if (s->srp_ctx.login != NULL)
1614 *al = SSL_AD_DECODE_ERROR;
1617 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1619 memcpy(s->srp_ctx.login, &data[1], len);
1620 s->srp_ctx.login[len]='\0';
1622 if (strlen(s->srp_ctx.login) != len)
1624 *al = SSL_AD_DECODE_ERROR;
1630 #ifndef OPENSSL_NO_EC
1631 else if (type == TLSEXT_TYPE_ec_point_formats &&
1632 s->version != DTLS1_VERSION)
1634 unsigned char *sdata = data;
1635 int ecpointformatlist_length = *(sdata++);
1637 if (ecpointformatlist_length != size - 1)
1639 *al = TLS1_AD_DECODE_ERROR;
1644 if(s->session->tlsext_ecpointformatlist)
1646 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1647 s->session->tlsext_ecpointformatlist = NULL;
1649 s->session->tlsext_ecpointformatlist_length = 0;
1650 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1652 *al = TLS1_AD_INTERNAL_ERROR;
1655 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1656 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1659 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1660 sdata = s->session->tlsext_ecpointformatlist;
1661 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1662 fprintf(stderr,"%i ",*(sdata++));
1663 fprintf(stderr,"\n");
1666 else if (type == TLSEXT_TYPE_elliptic_curves &&
1667 s->version != DTLS1_VERSION)
1669 unsigned char *sdata = data;
1670 int ellipticcurvelist_length = (*(sdata++) << 8);
1671 ellipticcurvelist_length += (*(sdata++));
1673 if (ellipticcurvelist_length != size - 2 ||
1674 ellipticcurvelist_length < 1)
1676 *al = TLS1_AD_DECODE_ERROR;
1681 if(s->session->tlsext_ellipticcurvelist)
1683 *al = TLS1_AD_DECODE_ERROR;
1686 s->session->tlsext_ellipticcurvelist_length = 0;
1687 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1689 *al = TLS1_AD_INTERNAL_ERROR;
1692 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1693 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
1696 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1697 sdata = s->session->tlsext_ellipticcurvelist;
1698 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1699 fprintf(stderr,"%i ",*(sdata++));
1700 fprintf(stderr,"\n");
1703 #endif /* OPENSSL_NO_EC */
1704 #ifdef TLSEXT_TYPE_opaque_prf_input
1705 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1706 s->version != DTLS1_VERSION)
1708 unsigned char *sdata = data;
1712 *al = SSL_AD_DECODE_ERROR;
1715 n2s(sdata, s->s3->client_opaque_prf_input_len);
1716 if (s->s3->client_opaque_prf_input_len != size - 2)
1718 *al = SSL_AD_DECODE_ERROR;
1722 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1723 OPENSSL_free(s->s3->client_opaque_prf_input);
1724 if (s->s3->client_opaque_prf_input_len == 0)
1725 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1727 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1728 if (s->s3->client_opaque_prf_input == NULL)
1730 *al = TLS1_AD_INTERNAL_ERROR;
1735 else if (type == TLSEXT_TYPE_session_ticket)
1737 if (s->tls_session_ticket_ext_cb &&
1738 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1740 *al = TLS1_AD_INTERNAL_ERROR;
1744 else if (type == TLSEXT_TYPE_renegotiate)
1746 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1748 renegotiate_seen = 1;
1750 else if (type == TLSEXT_TYPE_signature_algorithms)
1753 if (s->cert->peer_sigalgs || size < 2)
1755 *al = SSL_AD_DECODE_ERROR;
1760 if (dsize != size || dsize & 1 || !dsize)
1762 *al = SSL_AD_DECODE_ERROR;
1765 if (!tls1_process_sigalgs(s, data, dsize))
1767 *al = SSL_AD_DECODE_ERROR;
1770 /* If sigalgs received and no shared algorithms fatal
1773 if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
1775 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
1776 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
1777 *al = SSL_AD_ILLEGAL_PARAMETER;
1781 else if (type == TLSEXT_TYPE_status_request &&
1782 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
1787 *al = SSL_AD_DECODE_ERROR;
1791 s->tlsext_status_type = *data++;
1793 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1795 const unsigned char *sdata;
1797 /* Read in responder_id_list */
1802 *al = SSL_AD_DECODE_ERROR;
1811 *al = SSL_AD_DECODE_ERROR;
1815 dsize -= 2 + idsize;
1819 *al = SSL_AD_DECODE_ERROR;
1824 id = d2i_OCSP_RESPID(NULL,
1828 *al = SSL_AD_DECODE_ERROR;
1833 OCSP_RESPID_free(id);
1834 *al = SSL_AD_DECODE_ERROR;
1837 if (!s->tlsext_ocsp_ids
1838 && !(s->tlsext_ocsp_ids =
1839 sk_OCSP_RESPID_new_null()))
1841 OCSP_RESPID_free(id);
1842 *al = SSL_AD_INTERNAL_ERROR;
1845 if (!sk_OCSP_RESPID_push(
1846 s->tlsext_ocsp_ids, id))
1848 OCSP_RESPID_free(id);
1849 *al = SSL_AD_INTERNAL_ERROR;
1854 /* Read in request_extensions */
1857 *al = SSL_AD_DECODE_ERROR;
1864 *al = SSL_AD_DECODE_ERROR;
1870 if (s->tlsext_ocsp_exts)
1872 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1873 X509_EXTENSION_free);
1876 s->tlsext_ocsp_exts =
1877 d2i_X509_EXTENSIONS(NULL,
1879 if (!s->tlsext_ocsp_exts
1880 || (data + dsize != sdata))
1882 *al = SSL_AD_DECODE_ERROR;
1887 /* We don't know what to do with any other type
1891 s->tlsext_status_type = -1;
1893 #ifndef OPENSSL_NO_HEARTBEATS
1894 else if (type == TLSEXT_TYPE_heartbeat)
1898 case 0x01: /* Client allows us to send HB requests */
1899 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1901 case 0x02: /* Client doesn't accept HB requests */
1902 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1903 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1905 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1910 #ifndef OPENSSL_NO_NEXTPROTONEG
1911 else if (type == TLSEXT_TYPE_next_proto_neg &&
1912 s->s3->tmp.finish_md_len == 0)
1914 /* We shouldn't accept this extension on a
1917 * s->new_session will be set on renegotiation, but we
1918 * probably shouldn't rely that it couldn't be set on
1919 * the initial renegotation too in certain cases (when
1920 * there's some other reason to disallow resuming an
1921 * earlier session -- the current code won't be doing
1922 * anything like that, but this might change).
1924 * A valid sign that there's been a previous handshake
1925 * in this connection is if s->s3->tmp.finish_md_len >
1926 * 0. (We are talking about a check that will happen
1927 * in the Hello protocol round, well before a new
1928 * Finished message could have been computed.) */
1929 s->s3->next_proto_neg_seen = 1;
1933 /* session ticket processed earlier */
1934 else if (type == TLSEXT_TYPE_use_srtp)
1936 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1941 else if (type == TLSEXT_TYPE_server_authz)
1943 unsigned char *sdata = data;
1944 unsigned char server_authz_dataformatlist_length;
1948 *al = TLS1_AD_DECODE_ERROR;
1952 server_authz_dataformatlist_length = *(sdata++);
1954 if (server_authz_dataformatlist_length != size - 1)
1956 *al = TLS1_AD_DECODE_ERROR;
1960 /* Successful session resumption uses the same authz
1961 * information as the original session so we ignore this
1962 * in the case of a session resumption. */
1966 if (s->s3->tlsext_authz_client_types != NULL)
1967 OPENSSL_free(s->s3->tlsext_authz_client_types);
1968 s->s3->tlsext_authz_client_types =
1969 OPENSSL_malloc(server_authz_dataformatlist_length);
1970 if (!s->s3->tlsext_authz_client_types)
1972 *al = TLS1_AD_INTERNAL_ERROR;
1976 s->s3->tlsext_authz_client_types_len =
1977 server_authz_dataformatlist_length;
1978 memcpy(s->s3->tlsext_authz_client_types,
1980 server_authz_dataformatlist_length);
1982 /* Sort the types in order to check for duplicates. */
1983 qsort(s->s3->tlsext_authz_client_types,
1984 server_authz_dataformatlist_length,
1985 1 /* element size */,
1988 for (i = 0; i < server_authz_dataformatlist_length; i++)
1991 s->s3->tlsext_authz_client_types[i] ==
1992 s->s3->tlsext_authz_client_types[i-1])
1994 *al = TLS1_AD_DECODE_ERROR;
2008 /* Need RI if renegotiating */
2010 if (!renegotiate_seen && s->renegotiate &&
2011 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2013 *al = SSL_AD_HANDSHAKE_FAILURE;
2014 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2015 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2018 /* If no signature algorithms extension set default values */
2019 if (!s->cert->peer_sigalgs)
2020 ssl_cert_set_default_md(s->cert);
2025 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2028 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2030 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2034 if (ssl_check_clienthello_tlsext_early(s) <= 0)
2036 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
2042 #ifndef OPENSSL_NO_NEXTPROTONEG
2043 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2044 * elements of zero length are allowed and the set of elements must exactly fill
2045 * the length of the block. */
2046 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
2048 unsigned int off = 0;
2062 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2064 unsigned short length;
2065 unsigned short type;
2066 unsigned short size;
2067 unsigned char *data = *p;
2068 int tlsext_servername = 0;
2069 int renegotiate_seen = 0;
2071 #ifndef OPENSSL_NO_NEXTPROTONEG
2072 s->s3->next_proto_neg_seen = 0;
2075 #ifndef OPENSSL_NO_HEARTBEATS
2076 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2077 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2080 if (data >= (d+n-2))
2084 if (data+length != d+n)
2086 *al = SSL_AD_DECODE_ERROR;
2090 while(data <= (d+n-4))
2095 if (data+size > (d+n))
2098 if (s->tlsext_debug_cb)
2099 s->tlsext_debug_cb(s, 1, type, data, size,
2100 s->tlsext_debug_arg);
2102 if (type == TLSEXT_TYPE_server_name)
2104 if (s->tlsext_hostname == NULL || size > 0)
2106 *al = TLS1_AD_UNRECOGNIZED_NAME;
2109 tlsext_servername = 1;
2112 #ifndef OPENSSL_NO_EC
2113 else if (type == TLSEXT_TYPE_ec_point_formats &&
2114 s->version != DTLS1_VERSION)
2116 unsigned char *sdata = data;
2117 int ecpointformatlist_length = *(sdata++);
2119 if (ecpointformatlist_length != size - 1 ||
2120 ecpointformatlist_length < 1)
2122 *al = TLS1_AD_DECODE_ERROR;
2125 s->session->tlsext_ecpointformatlist_length = 0;
2126 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2127 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2129 *al = TLS1_AD_INTERNAL_ERROR;
2132 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2133 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2135 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2136 sdata = s->session->tlsext_ecpointformatlist;
2137 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2138 fprintf(stderr,"%i ",*(sdata++));
2139 fprintf(stderr,"\n");
2142 #endif /* OPENSSL_NO_EC */
2144 else if (type == TLSEXT_TYPE_session_ticket)
2146 if (s->tls_session_ticket_ext_cb &&
2147 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2149 *al = TLS1_AD_INTERNAL_ERROR;
2152 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2155 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2158 s->tlsext_ticket_expected = 1;
2160 #ifdef TLSEXT_TYPE_opaque_prf_input
2161 else if (type == TLSEXT_TYPE_opaque_prf_input &&
2162 s->version != DTLS1_VERSION)
2164 unsigned char *sdata = data;
2168 *al = SSL_AD_DECODE_ERROR;
2171 n2s(sdata, s->s3->server_opaque_prf_input_len);
2172 if (s->s3->server_opaque_prf_input_len != size - 2)
2174 *al = SSL_AD_DECODE_ERROR;
2178 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2179 OPENSSL_free(s->s3->server_opaque_prf_input);
2180 if (s->s3->server_opaque_prf_input_len == 0)
2181 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2183 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2185 if (s->s3->server_opaque_prf_input == NULL)
2187 *al = TLS1_AD_INTERNAL_ERROR;
2192 else if (type == TLSEXT_TYPE_status_request &&
2193 s->version != DTLS1_VERSION)
2195 /* MUST be empty and only sent if we've requested
2196 * a status request message.
2198 if ((s->tlsext_status_type == -1) || (size > 0))
2200 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2203 /* Set flag to expect CertificateStatus message */
2204 s->tlsext_status_expected = 1;
2206 #ifndef OPENSSL_NO_NEXTPROTONEG
2207 else if (type == TLSEXT_TYPE_next_proto_neg &&
2208 s->s3->tmp.finish_md_len == 0)
2210 unsigned char *selected;
2211 unsigned char selected_len;
2213 /* We must have requested it. */
2214 if ((s->ctx->next_proto_select_cb == NULL))
2216 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2219 /* The data must be valid */
2220 if (!ssl_next_proto_validate(data, size))
2222 *al = TLS1_AD_DECODE_ERROR;
2225 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2227 *al = TLS1_AD_INTERNAL_ERROR;
2230 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2231 if (!s->next_proto_negotiated)
2233 *al = TLS1_AD_INTERNAL_ERROR;
2236 memcpy(s->next_proto_negotiated, selected, selected_len);
2237 s->next_proto_negotiated_len = selected_len;
2238 s->s3->next_proto_neg_seen = 1;
2241 else if (type == TLSEXT_TYPE_renegotiate)
2243 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2245 renegotiate_seen = 1;
2247 #ifndef OPENSSL_NO_HEARTBEATS
2248 else if (type == TLSEXT_TYPE_heartbeat)
2252 case 0x01: /* Server allows us to send HB requests */
2253 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2255 case 0x02: /* Server doesn't accept HB requests */
2256 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2257 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2259 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2264 else if (type == TLSEXT_TYPE_use_srtp)
2266 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2271 else if (type == TLSEXT_TYPE_server_authz)
2273 /* We only support audit proofs. It's an error to send
2274 * an authz hello extension if the client
2275 * didn't request a proof. */
2276 unsigned char *sdata = data;
2277 unsigned char server_authz_dataformatlist_length;
2279 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2281 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2287 *al = TLS1_AD_DECODE_ERROR;
2291 server_authz_dataformatlist_length = *(sdata++);
2292 if (server_authz_dataformatlist_length != size - 1)
2294 *al = TLS1_AD_DECODE_ERROR;
2298 /* We only support audit proofs, so a legal ServerHello
2299 * authz list contains exactly one entry. */
2300 if (server_authz_dataformatlist_length != 1 ||
2301 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2303 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2307 s->s3->tlsext_authz_server_promised = 1;
2315 *al = SSL_AD_DECODE_ERROR;
2319 if (!s->hit && tlsext_servername == 1)
2321 if (s->tlsext_hostname)
2323 if (s->session->tlsext_hostname == NULL)
2325 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2326 if (!s->session->tlsext_hostname)
2328 *al = SSL_AD_UNRECOGNIZED_NAME;
2334 *al = SSL_AD_DECODE_ERROR;
2344 /* Determine if we need to see RI. Strictly speaking if we want to
2345 * avoid an attack we should *always* see RI even on initial server
2346 * hello because the client doesn't see any renegotiation during an
2347 * attack. However this would mean we could not connect to any server
2348 * which doesn't support RI so for the immediate future tolerate RI
2349 * absence on initial connect only.
2351 if (!renegotiate_seen
2352 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2353 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2355 *al = SSL_AD_HANDSHAKE_FAILURE;
2356 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2357 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2365 int ssl_prepare_clienthello_tlsext(SSL *s)
2368 #ifdef TLSEXT_TYPE_opaque_prf_input
2372 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2374 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2379 if (s->tlsext_opaque_prf_input != NULL)
2381 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2382 OPENSSL_free(s->s3->client_opaque_prf_input);
2384 if (s->tlsext_opaque_prf_input_len == 0)
2385 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2387 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2388 if (s->s3->client_opaque_prf_input == NULL)
2390 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2393 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2397 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2398 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2405 int ssl_prepare_serverhello_tlsext(SSL *s)
2407 #ifndef OPENSSL_NO_EC
2408 /* If we are server and using an ECC cipher suite, send the point formats we support
2409 * if the client sent us an ECPointsFormat extension. Note that the server is not
2410 * supposed to send an EllipticCurves extension.
2413 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2414 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2415 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2416 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2420 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2421 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
2423 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2426 s->tlsext_ecpointformatlist_length = 3;
2427 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2428 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2429 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2431 #endif /* OPENSSL_NO_EC */
2436 static int ssl_check_clienthello_tlsext_early(SSL *s)
2438 int ret=SSL_TLSEXT_ERR_NOACK;
2439 int al = SSL_AD_UNRECOGNIZED_NAME;
2441 #ifndef OPENSSL_NO_EC
2442 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2443 * ssl3_choose_cipher in s3_lib.c.
2445 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2446 * ssl3_choose_cipher in s3_lib.c.
2450 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2451 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2452 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2453 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2455 #ifdef TLSEXT_TYPE_opaque_prf_input
2457 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2458 * but we might be sending an alert in response to the client hello,
2459 * so this has to happen here in
2460 * ssl_check_clienthello_tlsext_early(). */
2464 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2466 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2469 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2470 al = SSL_AD_INTERNAL_ERROR;
2475 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2476 OPENSSL_free(s->s3->server_opaque_prf_input);
2477 s->s3->server_opaque_prf_input = NULL;
2479 if (s->tlsext_opaque_prf_input != NULL)
2481 if (s->s3->client_opaque_prf_input != NULL &&
2482 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2484 /* can only use this extension if we have a server opaque PRF input
2485 * of the same length as the client opaque PRF input! */
2487 if (s->tlsext_opaque_prf_input_len == 0)
2488 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2490 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2491 if (s->s3->server_opaque_prf_input == NULL)
2493 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2494 al = SSL_AD_INTERNAL_ERROR;
2497 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2501 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2503 /* The callback wants to enforce use of the extension,
2504 * but we can't do that with the client opaque PRF input;
2505 * abort the handshake.
2507 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2508 al = SSL_AD_HANDSHAKE_FAILURE;
2516 case SSL_TLSEXT_ERR_ALERT_FATAL:
2517 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2520 case SSL_TLSEXT_ERR_ALERT_WARNING:
2521 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2524 case SSL_TLSEXT_ERR_NOACK:
2525 s->servername_done=0;
2531 int ssl_check_clienthello_tlsext_late(SSL *s)
2533 int ret = SSL_TLSEXT_ERR_OK;
2536 /* If status request then ask callback what to do.
2537 * Note: this must be called after servername callbacks in case
2538 * the certificate has changed, and must be called after the cipher
2539 * has been chosen because this may influence which certificate is sent
2541 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2544 CERT_PKEY *certpkey;
2545 certpkey = ssl_get_server_send_pkey(s);
2546 /* If no certificate can't return certificate status */
2547 if (certpkey == NULL)
2549 s->tlsext_status_expected = 0;
2552 /* Set current certificate to one we will use so
2553 * SSL_get_certificate et al can pick it up.
2555 s->cert->key = certpkey;
2556 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2559 /* We don't want to send a status request response */
2560 case SSL_TLSEXT_ERR_NOACK:
2561 s->tlsext_status_expected = 0;
2563 /* status request response should be sent */
2564 case SSL_TLSEXT_ERR_OK:
2565 if (s->tlsext_ocsp_resp)
2566 s->tlsext_status_expected = 1;
2568 s->tlsext_status_expected = 0;
2570 /* something bad happened */
2571 case SSL_TLSEXT_ERR_ALERT_FATAL:
2572 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2573 al = SSL_AD_INTERNAL_ERROR;
2578 s->tlsext_status_expected = 0;
2583 case SSL_TLSEXT_ERR_ALERT_FATAL:
2584 ssl3_send_alert(s, SSL3_AL_FATAL,al);
2587 case SSL_TLSEXT_ERR_ALERT_WARNING:
2588 ssl3_send_alert(s, SSL3_AL_WARNING,al);
2596 int ssl_check_serverhello_tlsext(SSL *s)
2598 int ret=SSL_TLSEXT_ERR_NOACK;
2599 int al = SSL_AD_UNRECOGNIZED_NAME;
2601 #ifndef OPENSSL_NO_EC
2602 /* If we are client and using an elliptic curve cryptography cipher
2603 * suite, then if server returns an EC point formats lists extension
2604 * it must contain uncompressed.
2606 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2607 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2608 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
2609 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
2610 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
2612 /* we are using an ECC cipher */
2614 unsigned char *list;
2615 int found_uncompressed = 0;
2616 list = s->session->tlsext_ecpointformatlist;
2617 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2619 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2621 found_uncompressed = 1;
2625 if (!found_uncompressed)
2627 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2631 ret = SSL_TLSEXT_ERR_OK;
2632 #endif /* OPENSSL_NO_EC */
2634 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2635 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2636 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2637 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2639 #ifdef TLSEXT_TYPE_opaque_prf_input
2640 if (s->s3->server_opaque_prf_input_len > 0)
2642 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2643 * So first verify that we really have a value from the server too. */
2645 if (s->s3->server_opaque_prf_input == NULL)
2647 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2648 al = SSL_AD_HANDSHAKE_FAILURE;
2651 /* Anytime the server *has* sent an opaque PRF input, we need to check
2652 * that we have a client opaque PRF input of the same size. */
2653 if (s->s3->client_opaque_prf_input == NULL ||
2654 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2656 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2657 al = SSL_AD_ILLEGAL_PARAMETER;
2662 /* If we've requested certificate status and we wont get one
2665 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2666 && s->ctx && s->ctx->tlsext_status_cb)
2669 /* Set resp to NULL, resplen to -1 so callback knows
2670 * there is no response.
2672 if (s->tlsext_ocsp_resp)
2674 OPENSSL_free(s->tlsext_ocsp_resp);
2675 s->tlsext_ocsp_resp = NULL;
2677 s->tlsext_ocsp_resplen = -1;
2678 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2681 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2682 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2686 al = SSL_AD_INTERNAL_ERROR;
2687 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2693 case SSL_TLSEXT_ERR_ALERT_FATAL:
2694 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2697 case SSL_TLSEXT_ERR_ALERT_WARNING:
2698 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2701 case SSL_TLSEXT_ERR_NOACK:
2702 s->servername_done=0;
2708 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2711 if (s->version < SSL3_VERSION)
2713 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2715 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2719 if (ssl_check_serverhello_tlsext(s) <= 0)
2721 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2727 /* Since the server cache lookup is done early on in the processing of the
2728 * ClientHello, and other operations depend on the result, we need to handle
2729 * any TLS session ticket extension at the same time.
2731 * session_id: points at the session ID in the ClientHello. This code will
2732 * read past the end of this in order to parse out the session ticket
2733 * extension, if any.
2734 * len: the length of the session ID.
2735 * limit: a pointer to the first byte after the ClientHello.
2736 * ret: (output) on return, if a ticket was decrypted, then this is set to
2737 * point to the resulting session.
2739 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2740 * ciphersuite, in which case we have no use for session tickets and one will
2741 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2744 * -1: fatal error, either from parsing or decrypting the ticket.
2745 * 0: no ticket was found (or was ignored, based on settings).
2746 * 1: a zero length extension was found, indicating that the client supports
2747 * session tickets but doesn't currently have one to offer.
2748 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2749 * couldn't be decrypted because of a non-fatal error.
2750 * 3: a ticket was successfully decrypted and *ret was set.
2753 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2754 * a new session ticket to the client because the client indicated support
2755 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2756 * a session ticket or we couldn't use the one it gave us, or if
2757 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2758 * Otherwise, s->tlsext_ticket_expected is set to 0.
2760 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2761 const unsigned char *limit, SSL_SESSION **ret)
2763 /* Point after session ID in client hello */
2764 const unsigned char *p = session_id + len;
2768 s->tlsext_ticket_expected = 0;
2770 /* If tickets disabled behave as if no ticket present
2771 * to permit stateful resumption.
2773 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2775 if ((s->version <= SSL3_VERSION) || !limit)
2779 /* Skip past DTLS cookie */
2780 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2787 /* Skip past cipher list */
2792 /* Skip past compression algorithm list */
2797 /* Now at start of extensions */
2798 if ((p + 2) >= limit)
2801 while ((p + 4) <= limit)
2803 unsigned short type, size;
2806 if (p + size > limit)
2808 if (type == TLSEXT_TYPE_session_ticket)
2813 /* The client will accept a ticket but doesn't
2814 * currently have one. */
2815 s->tlsext_ticket_expected = 1;
2818 if (s->tls_session_secret_cb)
2820 /* Indicate that the ticket couldn't be
2821 * decrypted rather than generating the session
2822 * from ticket now, trigger abbreviated
2823 * handshake based on external mechanism to
2824 * calculate the master secret later. */
2827 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2830 case 2: /* ticket couldn't be decrypted */
2831 s->tlsext_ticket_expected = 1;
2833 case 3: /* ticket was decrypted */
2835 case 4: /* ticket decrypted but need to renew */
2836 s->tlsext_ticket_expected = 1;
2838 default: /* fatal error */
2847 /* tls_decrypt_ticket attempts to decrypt a session ticket.
2849 * etick: points to the body of the session ticket extension.
2850 * eticklen: the length of the session tickets extenion.
2851 * sess_id: points at the session ID.
2852 * sesslen: the length of the session ID.
2853 * psess: (output) on return, if a ticket was decrypted, then this is set to
2854 * point to the resulting session.
2857 * -1: fatal error, either from parsing or decrypting the ticket.
2858 * 2: the ticket couldn't be decrypted.
2859 * 3: a ticket was successfully decrypted and *psess was set.
2860 * 4: same as 3, but the ticket needs to be renewed.
2862 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2863 const unsigned char *sess_id, int sesslen,
2864 SSL_SESSION **psess)
2867 unsigned char *sdec;
2868 const unsigned char *p;
2869 int slen, mlen, renew_ticket = 0;
2870 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2873 SSL_CTX *tctx = s->initial_ctx;
2874 /* Need at least keyname + iv + some encrypted data */
2877 /* Initialize session ticket encryption and HMAC contexts */
2878 HMAC_CTX_init(&hctx);
2879 EVP_CIPHER_CTX_init(&ctx);
2880 if (tctx->tlsext_ticket_key_cb)
2882 unsigned char *nctick = (unsigned char *)etick;
2883 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2894 /* Check key name matches */
2895 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2897 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2898 tlsext_tick_md(), NULL);
2899 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2900 tctx->tlsext_tick_aes_key, etick + 16);
2902 /* Attempt to process session ticket, first conduct sanity and
2903 * integrity checks on ticket.
2905 mlen = HMAC_size(&hctx);
2908 EVP_CIPHER_CTX_cleanup(&ctx);
2912 /* Check HMAC of encrypted ticket */
2913 HMAC_Update(&hctx, etick, eticklen);
2914 HMAC_Final(&hctx, tick_hmac, NULL);
2915 HMAC_CTX_cleanup(&hctx);
2916 if (memcmp(tick_hmac, etick + eticklen, mlen))
2918 /* Attempt to decrypt session data */
2919 /* Move p after IV to start of encrypted ticket, update length */
2920 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2921 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2922 sdec = OPENSSL_malloc(eticklen);
2925 EVP_CIPHER_CTX_cleanup(&ctx);
2928 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2929 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
2932 EVP_CIPHER_CTX_cleanup(&ctx);
2935 sess = d2i_SSL_SESSION(NULL, &p, slen);
2939 /* The session ID, if non-empty, is used by some clients to
2940 * detect that the ticket has been accepted. So we copy it to
2941 * the session structure. If it is empty set length to zero
2942 * as required by standard.
2945 memcpy(sess->session_id, sess_id, sesslen);
2946 sess->session_id_length = sesslen;
2954 /* For session parse failure, indicate that we need to send a new
2959 /* Tables to translate from NIDs to TLS v1.2 ids */
2967 static tls12_lookup tls12_md[] = {
2968 {NID_md5, TLSEXT_hash_md5},
2969 {NID_sha1, TLSEXT_hash_sha1},
2970 {NID_sha224, TLSEXT_hash_sha224},
2971 {NID_sha256, TLSEXT_hash_sha256},
2972 {NID_sha384, TLSEXT_hash_sha384},
2973 {NID_sha512, TLSEXT_hash_sha512}
2976 static tls12_lookup tls12_sig[] = {
2977 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2978 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2979 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2982 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2985 for (i = 0; i < tlen; i++)
2987 if (table[i].nid == nid)
2993 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2996 for (i = 0; i < tlen; i++)
2998 if ((table[i].id) == id)
2999 return table[i].nid;
3004 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
3009 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3010 sizeof(tls12_md)/sizeof(tls12_lookup));
3013 sig_id = tls12_get_sigid(pk);
3016 p[0] = (unsigned char)md_id;
3017 p[1] = (unsigned char)sig_id;
3021 int tls12_get_sigid(const EVP_PKEY *pk)
3023 return tls12_find_id(pk->type, tls12_sig,
3024 sizeof(tls12_sig)/sizeof(tls12_lookup));
3027 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3031 #ifndef OPENSSL_NO_MD5
3032 case TLSEXT_hash_md5:
3039 #ifndef OPENSSL_NO_SHA
3040 case TLSEXT_hash_sha1:
3043 #ifndef OPENSSL_NO_SHA256
3044 case TLSEXT_hash_sha224:
3045 return EVP_sha224();
3047 case TLSEXT_hash_sha256:
3048 return EVP_sha256();
3050 #ifndef OPENSSL_NO_SHA512
3051 case TLSEXT_hash_sha384:
3052 return EVP_sha384();
3054 case TLSEXT_hash_sha512:
3055 return EVP_sha512();
3063 static int tls12_get_pkey_idx(unsigned char sig_alg)
3067 #ifndef OPENSSL_NO_RSA
3068 case TLSEXT_signature_rsa:
3069 return SSL_PKEY_RSA_SIGN;
3071 #ifndef OPENSSL_NO_DSA
3072 case TLSEXT_signature_dsa:
3073 return SSL_PKEY_DSA_SIGN;
3075 #ifndef OPENSSL_NO_ECDSA
3076 case TLSEXT_signature_ecdsa:
3077 return SSL_PKEY_ECC;
3083 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3084 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3085 int *psignhash_nid, const unsigned char *data)
3087 int sign_nid = 0, hash_nid = 0;
3088 if (!phash_nid && !psign_nid && !psignhash_nid)
3090 if (phash_nid || psignhash_nid)
3092 hash_nid = tls12_find_nid(data[0], tls12_md,
3093 sizeof(tls12_md)/sizeof(tls12_lookup));
3095 *phash_nid = hash_nid;
3097 if (psign_nid || psignhash_nid)
3099 sign_nid = tls12_find_nid(data[1], tls12_sig,
3100 sizeof(tls12_sig)/sizeof(tls12_lookup));
3102 *psign_nid = sign_nid;
3106 if (sign_nid && hash_nid)
3107 OBJ_find_sigid_by_algs(psignhash_nid,
3108 hash_nid, sign_nid);
3110 *psignhash_nid = NID_undef;
3113 /* Given preference and allowed sigalgs set shared sigalgs */
3114 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
3115 const unsigned char *pref, size_t preflen,
3116 const unsigned char *allow, size_t allowlen)
3118 const unsigned char *ptmp, *atmp;
3119 size_t i, j, nmatch = 0;
3120 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3122 /* Skip disabled hashes or signature algorithms */
3123 if (tls12_get_hash(ptmp[0]) == NULL)
3125 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3127 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3129 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3134 shsig->rhash = ptmp[0];
3135 shsig->rsign = ptmp[1];
3136 tls1_lookup_sigalg(&shsig->hash_nid,
3138 &shsig->signandhash_nid,
3149 /* Set shared signature algorithms for SSL structures */
3150 static int tls1_set_shared_sigalgs(SSL *s)
3152 const unsigned char *pref, *allow, *conf;
3153 size_t preflen, allowlen, conflen;
3155 TLS_SIGALGS *salgs = NULL;
3157 /* If client use client signature algorithms if not NULL */
3158 if (!s->server && c->client_sigalgs)
3160 conf = c->client_sigalgs;
3161 conflen = c->client_sigalgslen;
3163 else if (c->conf_sigalgs)
3165 conf = c->conf_sigalgs;
3166 conflen = c->conf_sigalgslen;
3170 conf = tls12_sigalgs;
3171 conflen = sizeof(tls12_sigalgs);
3177 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
3181 allow = c->peer_sigalgs;
3182 allowlen = c->peer_sigalgslen;
3188 pref = c->peer_sigalgs;
3189 preflen = c->peer_sigalgslen;
3191 nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3194 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3197 nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3198 c->shared_sigalgs = salgs;
3199 c->shared_sigalgslen = nmatch;
3204 /* Set preferred digest for each key type */
3206 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3212 TLS_SIGALGS *sigptr;
3213 /* Extension ignored for TLS versions below 1.2 */
3214 if (TLS1_get_version(s) < TLS1_2_VERSION)
3216 /* Should never happen */
3220 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
3221 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
3222 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
3223 c->pkeys[SSL_PKEY_ECC].digest = NULL;
3225 c->peer_sigalgs = OPENSSL_malloc(dsize);
3226 if (!c->peer_sigalgs)
3228 c->peer_sigalgslen = dsize;
3229 memcpy(c->peer_sigalgs, data, dsize);
3231 tls1_set_shared_sigalgs(s);
3233 for (i = 0, sigptr = c->shared_sigalgs;
3234 i < c->shared_sigalgslen; i++, sigptr++)
3236 idx = tls12_get_pkey_idx(sigptr->rsign);
3237 if (idx > 0 && c->pkeys[idx].digest == NULL)
3239 md = tls12_get_hash(sigptr->rhash);
3240 c->pkeys[idx].digest = md;
3241 if (idx == SSL_PKEY_RSA_SIGN)
3242 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3246 /* In strict mode leave unset digests as NULL to indicate we can't
3247 * use the certificate for signing.
3249 if (!(s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT))
3251 /* Set any remaining keys to default values. NOTE: if alg is
3252 * not supported it stays as NULL.
3254 #ifndef OPENSSL_NO_DSA
3255 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3256 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3258 #ifndef OPENSSL_NO_RSA
3259 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3261 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3262 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3265 #ifndef OPENSSL_NO_ECDSA
3266 if (!c->pkeys[SSL_PKEY_ECC].digest)
3267 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3274 int SSL_get_sigalgs(SSL *s, int idx,
3275 int *psign, int *phash, int *psignhash,
3276 unsigned char *rsig, unsigned char *rhash)
3278 const unsigned char *psig = s->cert->peer_sigalgs;
3284 if (idx >= (int)s->cert->peer_sigalgslen)
3291 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3293 return s->cert->peer_sigalgslen / 2;
3296 int SSL_get_shared_sigalgs(SSL *s, int idx,
3297 int *psign, int *phash, int *psignhash,
3298 unsigned char *rsig, unsigned char *rhash)
3300 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3301 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3305 *phash = shsigalgs->hash_nid;
3307 *psign = shsigalgs->sign_nid;
3309 *psignhash = shsigalgs->signandhash_nid;
3311 *rsig = shsigalgs->rsign;
3313 *rhash = shsigalgs->rhash;
3314 return s->cert->shared_sigalgslen;
3318 #ifndef OPENSSL_NO_HEARTBEATS
3320 tls1_process_heartbeat(SSL *s)
3322 unsigned char *p = &s->s3->rrec.data[0], *pl;
3323 unsigned short hbtype;
3324 unsigned int payload;
3325 unsigned int padding = 16; /* Use minimum padding */
3327 /* Read type and payload length first */
3332 if (s->msg_callback)
3333 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3334 &s->s3->rrec.data[0], s->s3->rrec.length,
3335 s, s->msg_callback_arg);
3337 if (hbtype == TLS1_HB_REQUEST)
3339 unsigned char *buffer, *bp;
3342 /* Allocate memory for the response, size is 1 bytes
3343 * message type, plus 2 bytes payload length, plus
3344 * payload, plus padding
3346 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3349 /* Enter response type, length and copy payload */
3350 *bp++ = TLS1_HB_RESPONSE;
3352 memcpy(bp, pl, payload);
3354 /* Random padding */
3355 RAND_pseudo_bytes(bp, padding);
3357 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3359 if (r >= 0 && s->msg_callback)
3360 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3361 buffer, 3 + payload + padding,
3362 s, s->msg_callback_arg);
3364 OPENSSL_free(buffer);
3369 else if (hbtype == TLS1_HB_RESPONSE)
3373 /* We only send sequence numbers (2 bytes unsigned int),
3374 * and 16 random bytes, so we just try to read the
3375 * sequence number */
3378 if (payload == 18 && seq == s->tlsext_hb_seq)
3381 s->tlsext_hb_pending = 0;
3389 tls1_heartbeat(SSL *s)
3391 unsigned char *buf, *p;
3393 unsigned int payload = 18; /* Sequence number + random bytes */
3394 unsigned int padding = 16; /* Use minimum padding */
3396 /* Only send if peer supports and accepts HB requests... */
3397 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3398 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3400 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3404 /* ...and there is none in flight yet... */
3405 if (s->tlsext_hb_pending)
3407 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3411 /* ...and no handshake in progress. */
3412 if (SSL_in_init(s) || s->in_handshake)
3414 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3418 /* Check if padding is too long, payload and padding
3419 * must not exceed 2^14 - 3 = 16381 bytes in total.
3421 OPENSSL_assert(payload + padding <= 16381);
3423 /* Create HeartBeat message, we just use a sequence number
3424 * as payload to distuingish different messages and add
3425 * some random stuff.
3426 * - Message Type, 1 byte
3427 * - Payload Length, 2 bytes (unsigned int)
3428 * - Payload, the sequence number (2 bytes uint)
3429 * - Payload, random bytes (16 bytes uint)
3432 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3435 *p++ = TLS1_HB_REQUEST;
3436 /* Payload length (18 bytes here) */
3438 /* Sequence number */
3439 s2n(s->tlsext_hb_seq, p);
3440 /* 16 random bytes */
3441 RAND_pseudo_bytes(p, 16);
3443 /* Random padding */
3444 RAND_pseudo_bytes(p, padding);
3446 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3449 if (s->msg_callback)
3450 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3451 buf, 3 + payload + padding,
3452 s, s->msg_callback_arg);
3454 s->tlsext_hb_pending = 1;
3463 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3468 int sigalgs[MAX_SIGALGLEN];
3471 static int sig_cb(const char *elem, int len, void *arg)
3473 sig_cb_st *sarg = arg;
3476 int sig_alg, hash_alg;
3477 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3479 if (len > (int)(sizeof(etmp) - 1))
3481 memcpy(etmp, elem, len);
3483 p = strchr(etmp, '+');
3491 if (!strcmp(etmp, "RSA"))
3492 sig_alg = EVP_PKEY_RSA;
3493 else if (!strcmp(etmp, "DSA"))
3494 sig_alg = EVP_PKEY_DSA;
3495 else if (!strcmp(etmp, "ECDSA"))
3496 sig_alg = EVP_PKEY_EC;
3499 hash_alg = OBJ_sn2nid(p);
3500 if (hash_alg == NID_undef)
3501 hash_alg = OBJ_ln2nid(p);
3502 if (hash_alg == NID_undef)
3505 for (i = 0; i < sarg->sigalgcnt; i+=2)
3507 if (sarg->sigalgs[i] == sig_alg
3508 && sarg->sigalgs[i + 1] == hash_alg)
3511 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3512 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3516 /* Set suppored signature algorithms based on a colon separated list
3517 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3518 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
3522 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3524 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
3527 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
3529 unsigned char *sigalgs, *sptr;
3534 sigalgs = OPENSSL_malloc(salglen);
3535 if (sigalgs == NULL)
3537 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
3539 rhash = tls12_find_id(*psig_nids++, tls12_md,
3540 sizeof(tls12_md)/sizeof(tls12_lookup));
3541 rsign = tls12_find_id(*psig_nids++, tls12_sig,
3542 sizeof(tls12_sig)/sizeof(tls12_lookup));
3544 if (rhash == -1 || rsign == -1)
3552 if (c->client_sigalgs)
3553 OPENSSL_free(c->client_sigalgs);
3554 c->client_sigalgs = sigalgs;
3555 c->client_sigalgslen = salglen;
3559 if (c->conf_sigalgs)
3560 OPENSSL_free(c->conf_sigalgs);
3561 c->conf_sigalgs = sigalgs;
3562 c->conf_sigalgslen = salglen;
3568 OPENSSL_free(sigalgs);
3572 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
3576 if (default_nid == -1)
3578 sig_nid = X509_get_signature_nid(x);
3580 return sig_nid == default_nid ? 1 : 0;
3581 for (i = 0; i < c->shared_sigalgslen; i++)
3582 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
3587 /* Check certificate chain is consistent with TLS extensions and is
3590 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
3594 int rv = CERT_PKEY_INVALID;
3595 CERT_PKEY *cpk = NULL;
3599 cpk = c->pkeys + idx;
3601 pk = cpk->privatekey;
3603 /* If no cert or key, forget it */
3609 idx = ssl_cert_type(x, pk);
3614 /* Check all signature algorithms are consistent with
3615 * signature algorithms extension if TLS 1.2 or later
3618 if (TLS1_get_version(s) >= TLS1_2_VERSION
3619 && c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3622 unsigned char rsign = 0;
3623 if (c->peer_sigalgs)
3625 /* If no sigalgs extension use defaults from RFC5246 */
3630 case SSL_PKEY_RSA_ENC:
3631 case SSL_PKEY_RSA_SIGN:
3632 case SSL_PKEY_DH_RSA:
3633 rsign = TLSEXT_signature_rsa;
3634 default_nid = NID_sha1WithRSAEncryption;
3637 case SSL_PKEY_DSA_SIGN:
3638 case SSL_PKEY_DH_DSA:
3639 rsign = TLSEXT_signature_dsa;
3640 default_nid = NID_dsaWithSHA1;
3644 rsign = TLSEXT_signature_ecdsa;
3645 default_nid = NID_ecdsa_with_SHA1;
3653 /* If peer sent no signature algorithms extension and we
3654 * have set preferred signature algorithms check we support
3657 if (default_nid > 0 && c->conf_sigalgs)
3660 const unsigned char *p = c->conf_sigalgs;
3661 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
3663 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
3666 if (j == c->conf_sigalgslen)
3669 /* Check signature algorithm of each cert in chain */
3670 if (!tls1_check_sig_alg(c, x, default_nid))
3672 for (i = 0; i < sk_X509_num(chain); i++)
3674 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
3680 /* Check cert parameters are consistent */
3681 if (!tls1_check_cert_param(s, x))
3683 /* In strict mode check rest of chain too */
3684 if (c->cert_flags & SSL_CERT_FLAG_TLS_STRICT)
3686 for (i = 0; i < sk_X509_num(chain); i++)
3688 if (!tls1_check_cert_param(s, sk_X509_value(chain, i)))
3692 rv = CERT_PKEY_VALID;
3697 if (rv && cpk->digest)
3698 rv |= CERT_PKEY_SIGN;
3699 cpk->valid_flags = rv;
3704 /* Set validity of certificates in an SSL structure */
3705 void tls1_set_cert_validity(SSL *s)
3707 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
3708 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
3709 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
3710 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
3711 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
3712 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
3714 /* User level utiity function to check a chain is suitable */
3715 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
3717 return tls1_check_chain(s, x, pk, chain, -1);