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,
144 SSL3_HM_HEADER_LENGTH,
145 ssl3_set_handshake_header,
149 SSL3_ENC_METHOD TLSv1_1_enc_data={
152 tls1_setup_key_block,
153 tls1_generate_master_secret,
154 tls1_change_cipher_state,
155 tls1_final_finish_mac,
156 TLS1_FINISH_MAC_LENGTH,
157 tls1_cert_verify_mac,
158 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
159 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
161 tls1_export_keying_material,
162 SSL_ENC_FLAG_EXPLICIT_IV,
163 SSL3_HM_HEADER_LENGTH,
164 ssl3_set_handshake_header,
168 SSL3_ENC_METHOD TLSv1_2_enc_data={
171 tls1_setup_key_block,
172 tls1_generate_master_secret,
173 tls1_change_cipher_state,
174 tls1_final_finish_mac,
175 TLS1_FINISH_MAC_LENGTH,
176 tls1_cert_verify_mac,
177 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
178 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
180 tls1_export_keying_material,
181 SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_SHA256_PRF
182 |SSL_ENC_FLAG_TLS1_2_CIPHERS,
183 SSL3_HM_HEADER_LENGTH,
184 ssl3_set_handshake_header,
188 long tls1_default_timeout(void)
190 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
191 * is way too long for http, the cache would over fill */
197 if (!ssl3_new(s)) return(0);
198 s->method->ssl_clear(s);
202 void tls1_free(SSL *s)
204 #ifndef OPENSSL_NO_TLSEXT
205 if (s->tlsext_session_ticket)
207 OPENSSL_free(s->tlsext_session_ticket);
209 #endif /* OPENSSL_NO_TLSEXT */
213 void tls1_clear(SSL *s)
216 s->version = s->method->version;
219 #ifndef OPENSSL_NO_EC
221 static int nid_list[] =
223 NID_sect163k1, /* sect163k1 (1) */
224 NID_sect163r1, /* sect163r1 (2) */
225 NID_sect163r2, /* sect163r2 (3) */
226 NID_sect193r1, /* sect193r1 (4) */
227 NID_sect193r2, /* sect193r2 (5) */
228 NID_sect233k1, /* sect233k1 (6) */
229 NID_sect233r1, /* sect233r1 (7) */
230 NID_sect239k1, /* sect239k1 (8) */
231 NID_sect283k1, /* sect283k1 (9) */
232 NID_sect283r1, /* sect283r1 (10) */
233 NID_sect409k1, /* sect409k1 (11) */
234 NID_sect409r1, /* sect409r1 (12) */
235 NID_sect571k1, /* sect571k1 (13) */
236 NID_sect571r1, /* sect571r1 (14) */
237 NID_secp160k1, /* secp160k1 (15) */
238 NID_secp160r1, /* secp160r1 (16) */
239 NID_secp160r2, /* secp160r2 (17) */
240 NID_secp192k1, /* secp192k1 (18) */
241 NID_X9_62_prime192v1, /* secp192r1 (19) */
242 NID_secp224k1, /* secp224k1 (20) */
243 NID_secp224r1, /* secp224r1 (21) */
244 NID_secp256k1, /* secp256k1 (22) */
245 NID_X9_62_prime256v1, /* secp256r1 (23) */
246 NID_secp384r1, /* secp384r1 (24) */
247 NID_secp521r1 /* secp521r1 (25) */
251 static const unsigned char ecformats_default[] =
253 TLSEXT_ECPOINTFORMAT_uncompressed,
254 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
255 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
258 static const unsigned char eccurves_default[] =
260 0,14, /* sect571r1 (14) */
261 0,13, /* sect571k1 (13) */
262 0,25, /* secp521r1 (25) */
263 0,11, /* sect409k1 (11) */
264 0,12, /* sect409r1 (12) */
265 0,24, /* secp384r1 (24) */
266 0,9, /* sect283k1 (9) */
267 0,10, /* sect283r1 (10) */
268 0,22, /* secp256k1 (22) */
269 0,23, /* secp256r1 (23) */
270 0,8, /* sect239k1 (8) */
271 0,6, /* sect233k1 (6) */
272 0,7, /* sect233r1 (7) */
273 0,20, /* secp224k1 (20) */
274 0,21, /* secp224r1 (21) */
275 0,4, /* sect193r1 (4) */
276 0,5, /* sect193r2 (5) */
277 0,18, /* secp192k1 (18) */
278 0,19, /* secp192r1 (19) */
279 0,1, /* sect163k1 (1) */
280 0,2, /* sect163r1 (2) */
281 0,3, /* sect163r2 (3) */
282 0,15, /* secp160k1 (15) */
283 0,16, /* secp160r1 (16) */
284 0,17, /* secp160r2 (17) */
287 static const unsigned char suiteb_curves[] =
289 0, TLSEXT_curve_P_256,
290 0, TLSEXT_curve_P_384
293 int tls1_ec_curve_id2nid(int curve_id)
295 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
296 if ((curve_id < 1) || ((unsigned int)curve_id >
297 sizeof(nid_list)/sizeof(nid_list[0])))
299 return nid_list[curve_id-1];
302 int tls1_ec_nid2curve_id(int nid)
304 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
307 case NID_sect163k1: /* sect163k1 (1) */
309 case NID_sect163r1: /* sect163r1 (2) */
311 case NID_sect163r2: /* sect163r2 (3) */
313 case NID_sect193r1: /* sect193r1 (4) */
315 case NID_sect193r2: /* sect193r2 (5) */
317 case NID_sect233k1: /* sect233k1 (6) */
319 case NID_sect233r1: /* sect233r1 (7) */
321 case NID_sect239k1: /* sect239k1 (8) */
323 case NID_sect283k1: /* sect283k1 (9) */
325 case NID_sect283r1: /* sect283r1 (10) */
327 case NID_sect409k1: /* sect409k1 (11) */
329 case NID_sect409r1: /* sect409r1 (12) */
331 case NID_sect571k1: /* sect571k1 (13) */
333 case NID_sect571r1: /* sect571r1 (14) */
335 case NID_secp160k1: /* secp160k1 (15) */
337 case NID_secp160r1: /* secp160r1 (16) */
339 case NID_secp160r2: /* secp160r2 (17) */
341 case NID_secp192k1: /* secp192k1 (18) */
343 case NID_X9_62_prime192v1: /* secp192r1 (19) */
345 case NID_secp224k1: /* secp224k1 (20) */
347 case NID_secp224r1: /* secp224r1 (21) */
349 case NID_secp256k1: /* secp256k1 (22) */
351 case NID_X9_62_prime256v1: /* secp256r1 (23) */
353 case NID_secp384r1: /* secp384r1 (24) */
355 case NID_secp521r1: /* secp521r1 (25) */
361 /* Get curves list, if "sess" is set return client curves otherwise
364 static void tls1_get_curvelist(SSL *s, int sess,
365 const unsigned char **pcurves,
370 *pcurves = s->session->tlsext_ellipticcurvelist;
371 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
374 /* For Suite B mode only include P-256, P-384 */
375 switch (tls1_suiteb(s))
377 case SSL_CERT_FLAG_SUITEB_128_LOS:
378 *pcurves = suiteb_curves;
379 *pcurveslen = sizeof(suiteb_curves);
382 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
383 *pcurves = suiteb_curves;
387 case SSL_CERT_FLAG_SUITEB_192_LOS:
388 *pcurves = suiteb_curves + 2;
392 *pcurves = s->tlsext_ellipticcurvelist;
393 *pcurveslen = s->tlsext_ellipticcurvelist_length;
397 *pcurves = eccurves_default;
398 *pcurveslen = sizeof(eccurves_default);
401 /* Check a curve is one of our preferences */
402 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
404 const unsigned char *curves;
406 unsigned int suiteb_flags = tls1_suiteb(s);
407 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
409 /* Check curve matches Suite B preferences */
412 unsigned long cid = s->s3->tmp.new_cipher->id;
415 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
417 if (p[2] != TLSEXT_curve_P_256)
420 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
422 if (p[2] != TLSEXT_curve_P_384)
425 else /* Should never happen */
428 tls1_get_curvelist(s, 0, &curves, &curveslen);
429 for (i = 0; i < curveslen; i += 2, curves += 2)
431 if (p[1] == curves[0] && p[2] == curves[1])
437 /* Return nth shared curve. If nmatch == -1 return number of
438 * matches. For nmatch == -2 return the NID of the curve to use for
442 int tls1_shared_curve(SSL *s, int nmatch)
444 const unsigned char *pref, *supp;
445 size_t preflen, supplen, i, j;
447 /* Can't do anything on client side */
454 /* For Suite B ciphersuite determines curve: we
455 * already know these are acceptable due to previous
458 unsigned long cid = s->s3->tmp.new_cipher->id;
459 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
460 return NID_X9_62_prime256v1; /* P-256 */
461 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
462 return NID_secp384r1; /* P-384 */
463 /* Should never happen */
466 /* If not Suite B just return first preference shared curve */
469 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
471 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
476 for (i = 0; i < preflen; i++, pref+=2)
478 const unsigned char *tsupp = supp;
479 for (j = 0; j < supplen; j++, tsupp+=2)
481 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
485 int id = (pref[0] << 8) | pref[1];
486 return tls1_ec_curve_id2nid(id);
497 int tls1_set_curves(unsigned char **pext, size_t *pextlen,
498 int *curves, size_t ncurves)
500 unsigned char *clist, *p;
502 /* Bitmap of curves included to detect duplicates: only works
503 * while curve ids < 32
505 unsigned long dup_list = 0;
506 clist = OPENSSL_malloc(ncurves * 2);
509 for (i = 0, p = clist; i < ncurves; i++)
511 unsigned long idmask;
513 id = tls1_ec_nid2curve_id(curves[i]);
515 if (!id || (dup_list & idmask))
526 *pextlen = ncurves * 2;
530 #define MAX_CURVELIST 25
535 int nid_arr[MAX_CURVELIST];
538 static int nid_cb(const char *elem, int len, void *arg)
540 nid_cb_st *narg = arg;
544 if (narg->nidcnt == MAX_CURVELIST)
546 if (len > (int)(sizeof(etmp) - 1))
548 memcpy(etmp, elem, len);
550 nid = EC_curve_nist2nid(etmp);
551 if (nid == NID_undef)
552 nid = OBJ_sn2nid(etmp);
553 if (nid == NID_undef)
554 nid = OBJ_ln2nid(etmp);
555 if (nid == NID_undef)
557 for (i = 0; i < narg->nidcnt; i++)
558 if (narg->nid_arr[i] == nid)
560 narg->nid_arr[narg->nidcnt++] = nid;
563 /* Set curves based on a colon separate list */
564 int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
569 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
573 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
575 /* For an EC key set TLS id and required compression based on parameters */
576 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
582 const EC_METHOD *meth;
585 /* Determine if it is a prime field */
586 grp = EC_KEY_get0_group(ec);
587 pt = EC_KEY_get0_public_key(ec);
590 meth = EC_GROUP_method_of(grp);
593 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
597 /* Determine curve ID */
598 id = EC_GROUP_get_curve_name(grp);
599 id = tls1_ec_nid2curve_id(id);
600 /* If we have an ID set it, otherwise set arbitrary explicit curve */
604 curve_id[1] = (unsigned char)id;
616 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
619 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
621 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
624 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
628 /* Check an EC key is compatible with extensions */
629 static int tls1_check_ec_key(SSL *s,
630 unsigned char *curve_id, unsigned char *comp_id)
632 const unsigned char *p;
635 /* If point formats extension present check it, otherwise everything
636 * is supported (see RFC4492).
638 if (comp_id && s->session->tlsext_ecpointformatlist)
640 p = s->session->tlsext_ecpointformatlist;
641 plen = s->session->tlsext_ecpointformatlist_length;
642 for (i = 0; i < plen; i++, p++)
652 /* Check curve is consistent with client and server preferences */
653 for (j = 0; j <= 1; j++)
655 tls1_get_curvelist(s, j, &p, &plen);
656 for (i = 0; i < plen; i+=2, p+=2)
658 if (p[0] == curve_id[0] && p[1] == curve_id[1])
663 /* For clients can only check sent curve list */
670 static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
673 /* If we have a custom point format list use it otherwise
675 if (s->tlsext_ecpointformatlist)
677 *pformats = s->tlsext_ecpointformatlist;
678 *pformatslen = s->tlsext_ecpointformatlist_length;
682 *pformats = ecformats_default;
683 /* For Suite B we don't support char2 fields */
685 *pformatslen = sizeof(ecformats_default) - 1;
687 *pformatslen = sizeof(ecformats_default);
691 /* Check cert parameters compatible with extensions: currently just checks
692 * EC certificates have compatible curves and compression.
694 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
696 unsigned char comp_id, curve_id[2];
699 pkey = X509_get_pubkey(x);
702 /* If not EC nothing to do */
703 if (pkey->type != EVP_PKEY_EC)
708 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
712 /* Can't check curve_id for client certs as we don't have a
713 * supported curves extension.
715 rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
718 /* Special case for suite B. We *MUST* sign using SHA256+P-256 or
719 * SHA384+P-384, adjust digest if necessary.
721 if (set_ee_md && tls1_suiteb(s))
728 /* Check to see we have necessary signing algorithm */
729 if (curve_id[1] == TLSEXT_curve_P_256)
730 check_md = NID_ecdsa_with_SHA256;
731 else if (curve_id[1] == TLSEXT_curve_P_384)
732 check_md = NID_ecdsa_with_SHA384;
734 return 0; /* Should never happen */
735 for (i = 0; i < c->shared_sigalgslen; i++)
736 if (check_md == c->shared_sigalgs[i].signandhash_nid)
738 if (i == c->shared_sigalgslen)
742 if (check_md == NID_ecdsa_with_SHA256)
743 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
745 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384();
750 /* Check EC temporary key is compatible with client extensions */
751 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
753 unsigned char curve_id[2];
754 EC_KEY *ec = s->cert->ecdh_tmp;
755 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
756 /* Allow any curve: not just those peer supports */
757 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
760 /* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
761 * no other curves permitted.
765 /* Curve to check determined by ciphersuite */
766 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
767 curve_id[1] = TLSEXT_curve_P_256;
768 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
769 curve_id[1] = TLSEXT_curve_P_384;
773 /* Check this curve is acceptable */
774 if (!tls1_check_ec_key(s, curve_id, NULL))
776 /* If auto or setting curve from callback assume OK */
777 if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
779 /* Otherwise check curve is acceptable */
782 unsigned char curve_tmp[2];
785 if (!tls1_set_ec_id(curve_tmp, NULL, ec))
787 if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
793 if (s->cert->ecdh_tmp_auto)
795 /* Need a shared curve */
796 if (tls1_shared_curve(s, 0))
802 if (s->cert->ecdh_tmp_cb)
807 if (!tls1_set_ec_id(curve_id, NULL, ec))
809 /* Set this to allow use of invalid curves for testing */
813 return tls1_check_ec_key(s, curve_id, NULL);
819 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
824 #endif /* OPENSSL_NO_EC */
826 #ifndef OPENSSL_NO_TLSEXT
828 /* List of supported signature algorithms and hashes. Should make this
829 * customisable at some point, for now include everything we support.
832 #ifdef OPENSSL_NO_RSA
833 #define tlsext_sigalg_rsa(md) /* */
835 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
838 #ifdef OPENSSL_NO_DSA
839 #define tlsext_sigalg_dsa(md) /* */
841 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
844 #ifdef OPENSSL_NO_ECDSA
845 #define tlsext_sigalg_ecdsa(md) /* */
847 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
850 #define tlsext_sigalg(md) \
851 tlsext_sigalg_rsa(md) \
852 tlsext_sigalg_dsa(md) \
853 tlsext_sigalg_ecdsa(md)
855 static unsigned char tls12_sigalgs[] = {
856 #ifndef OPENSSL_NO_SHA512
857 tlsext_sigalg(TLSEXT_hash_sha512)
858 tlsext_sigalg(TLSEXT_hash_sha384)
860 #ifndef OPENSSL_NO_SHA256
861 tlsext_sigalg(TLSEXT_hash_sha256)
862 tlsext_sigalg(TLSEXT_hash_sha224)
864 #ifndef OPENSSL_NO_SHA
865 tlsext_sigalg(TLSEXT_hash_sha1)
867 #ifndef OPENSSL_NO_MD5
868 tlsext_sigalg_rsa(TLSEXT_hash_md5)
871 #ifndef OPENSSL_NO_ECDSA
872 static unsigned char suiteb_sigalgs[] = {
873 tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
874 tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
877 size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
879 /* If Suite B mode use Suite B sigalgs only, ignore any other
882 #ifndef OPENSSL_NO_EC
883 switch (tls1_suiteb(s))
885 case SSL_CERT_FLAG_SUITEB_128_LOS:
886 *psigs = suiteb_sigalgs;
887 return sizeof(suiteb_sigalgs);
889 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
890 *psigs = suiteb_sigalgs;
893 case SSL_CERT_FLAG_SUITEB_192_LOS:
894 *psigs = suiteb_sigalgs + 2;
898 /* If server use client authentication sigalgs if not NULL */
899 if (s->server && s->cert->client_sigalgs)
901 *psigs = s->cert->client_sigalgs;
902 return s->cert->client_sigalgslen;
904 else if (s->cert->conf_sigalgs)
906 *psigs = s->cert->conf_sigalgs;
907 return s->cert->conf_sigalgslen;
911 *psigs = tls12_sigalgs;
913 /* If FIPS mode don't include MD5 which is last */
915 return sizeof(tls12_sigalgs) - 2;
918 return sizeof(tls12_sigalgs);
921 /* Check signature algorithm is consistent with sent supported signature
922 * algorithms and if so return relevant digest.
924 int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
925 const unsigned char *sig, EVP_PKEY *pkey)
927 const unsigned char *sent_sigs;
928 size_t sent_sigslen, i;
929 int sigalg = tls12_get_sigid(pkey);
930 /* Should never happen */
933 /* Check key type is consistent with signature */
934 if (sigalg != (int)sig[1])
936 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
939 #ifndef OPENSSL_NO_EC
940 if (pkey->type == EVP_PKEY_EC)
942 unsigned char curve_id[2], comp_id;
943 /* Check compression and curve matches extensions */
944 if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
946 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
948 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
951 /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
956 if (curve_id[1] == TLSEXT_curve_P_256)
958 if (sig[0] != TLSEXT_hash_sha256)
960 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
961 SSL_R_ILLEGAL_SUITEB_DIGEST);
965 else if (curve_id[1] == TLSEXT_curve_P_384)
967 if (sig[0] != TLSEXT_hash_sha384)
969 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
970 SSL_R_ILLEGAL_SUITEB_DIGEST);
978 else if (tls1_suiteb(s))
982 /* Check signature matches a type we sent */
983 sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
984 for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
986 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
989 /* Allow fallback to SHA1 if not strict mode */
990 if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
992 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
995 *pmd = tls12_get_hash(sig[0]);
998 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
1001 /* Store the digest used so applications can retrieve it if they
1004 if (s->session && s->session->sess_cert)
1005 s->session->sess_cert->peer_key->digest = *pmd;
1008 /* Get a mask of disabled algorithms: an algorithm is disabled
1009 * if it isn't supported or doesn't appear in supported signature
1010 * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
1011 * session and not global settings.
1014 void ssl_set_client_disabled(SSL *s)
1017 const unsigned char *sigalgs;
1018 size_t i, sigalgslen;
1019 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
1022 /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
1023 if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
1024 c->mask_ssl = SSL_TLSV1_2;
1027 /* Now go through all signature algorithms seeing if we support
1028 * any for RSA, DSA, ECDSA. Do this for all versions not just
1031 sigalgslen = tls12_get_psigalgs(s, &sigalgs);
1032 for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
1036 #ifndef OPENSSL_NO_RSA
1037 case TLSEXT_signature_rsa:
1041 #ifndef OPENSSL_NO_DSA
1042 case TLSEXT_signature_dsa:
1046 #ifndef OPENSSL_NO_ECDSA
1047 case TLSEXT_signature_ecdsa:
1053 /* Disable auth and static DH if we don't include any appropriate
1054 * signature algorithms.
1058 c->mask_a |= SSL_aRSA;
1059 c->mask_k |= SSL_kDHr|SSL_kECDHr;
1063 c->mask_a |= SSL_aDSS;
1064 c->mask_k |= SSL_kDHd;
1068 c->mask_a |= SSL_aECDSA;
1069 c->mask_k |= SSL_kECDHe;
1071 #ifndef OPENSSL_NO_KRB5
1072 if (!kssl_tgt_is_available(s->kssl_ctx))
1074 c->mask_a |= SSL_aKRB5;
1075 c->mask_k |= SSL_kKRB5;
1078 #ifndef OPENSSL_NO_PSK
1079 /* with PSK there must be client callback set */
1080 if (!s->psk_client_callback)
1082 c->mask_a |= SSL_aPSK;
1083 c->mask_k |= SSL_kPSK;
1085 #endif /* OPENSSL_NO_PSK */
1089 /* byte_compare is a compare function for qsort(3) that compares bytes. */
1090 static int byte_compare(const void *in_a, const void *in_b)
1092 unsigned char a = *((const unsigned char*) in_a);
1093 unsigned char b = *((const unsigned char*) in_b);
1102 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1105 unsigned char *ret = p;
1106 #ifndef OPENSSL_NO_EC
1107 /* See if we support any ECC ciphersuites */
1109 if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s))
1112 unsigned long alg_k, alg_a;
1113 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1115 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1117 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1119 alg_k = c->algorithm_mkey;
1120 alg_a = c->algorithm_auth;
1121 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
1122 || (alg_a & SSL_aECDSA)))
1131 /* don't add extensions for SSLv3 unless doing secure renegotiation */
1132 if (s->client_version == SSL3_VERSION
1133 && !s->s3->send_connection_binding)
1138 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1140 if (s->tlsext_hostname != NULL)
1142 /* Add TLS extension servername to the Client Hello message */
1143 unsigned long size_str;
1146 /* check for enough space.
1147 4 for the servername type and entension length
1148 2 for servernamelist length
1149 1 for the hostname type
1150 2 for hostname length
1154 if ((lenmax = limit - ret - 9) < 0
1155 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
1158 /* extension type and length */
1159 s2n(TLSEXT_TYPE_server_name,ret);
1160 s2n(size_str+5,ret);
1162 /* length of servername list */
1163 s2n(size_str+3,ret);
1165 /* hostname type, length and hostname */
1166 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
1168 memcpy(ret, s->tlsext_hostname, size_str);
1172 /* Add RI if renegotiating */
1177 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
1179 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1183 if((limit - p - 4 - el) < 0) return NULL;
1185 s2n(TLSEXT_TYPE_renegotiate,ret);
1188 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
1190 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1197 #ifndef OPENSSL_NO_SRP
1198 /* Add SRP username if there is one */
1199 if (s->srp_ctx.login != NULL)
1200 { /* Add TLS extension SRP username to the Client Hello message */
1202 int login_len = strlen(s->srp_ctx.login);
1203 if (login_len > 255 || login_len == 0)
1205 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1209 /* check for enough space.
1210 4 for the srp type type and entension length
1211 1 for the srp user identity
1212 + srp user identity length
1214 if ((limit - ret - 5 - login_len) < 0) return NULL;
1216 /* fill in the extension */
1217 s2n(TLSEXT_TYPE_srp,ret);
1218 s2n(login_len+1,ret);
1219 (*ret++) = (unsigned char) login_len;
1220 memcpy(ret, s->srp_ctx.login, login_len);
1225 #ifndef OPENSSL_NO_EC
1228 /* Add TLS extension ECPointFormats to the ClientHello message */
1230 const unsigned char *plist;
1233 tls1_get_formatlist(s, &plist, &plistlen);
1235 if ((lenmax = limit - ret - 5) < 0) return NULL;
1236 if (plistlen > (size_t)lenmax) return NULL;
1239 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1243 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1244 s2n(plistlen + 1,ret);
1245 *(ret++) = (unsigned char)plistlen ;
1246 memcpy(ret, plist, plistlen);
1249 /* Add TLS extension EllipticCurves to the ClientHello message */
1250 plist = s->tlsext_ellipticcurvelist;
1251 tls1_get_curvelist(s, 0, &plist, &plistlen);
1253 if ((lenmax = limit - ret - 6) < 0) return NULL;
1254 if (plistlen > (size_t)lenmax) return NULL;
1255 if (plistlen > 65532)
1257 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1261 s2n(TLSEXT_TYPE_elliptic_curves,ret);
1262 s2n(plistlen + 2, ret);
1264 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
1265 * elliptic_curve_list, but the examples use two bytes.
1266 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
1267 * resolves this to two bytes.
1270 memcpy(ret, plist, plistlen);
1273 #endif /* OPENSSL_NO_EC */
1275 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
1278 if (!s->new_session && s->session && s->session->tlsext_tick)
1279 ticklen = s->session->tlsext_ticklen;
1280 else if (s->session && s->tlsext_session_ticket &&
1281 s->tlsext_session_ticket->data)
1283 ticklen = s->tlsext_session_ticket->length;
1284 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1285 if (!s->session->tlsext_tick)
1287 memcpy(s->session->tlsext_tick,
1288 s->tlsext_session_ticket->data,
1290 s->session->tlsext_ticklen = ticklen;
1294 if (ticklen == 0 && s->tlsext_session_ticket &&
1295 s->tlsext_session_ticket->data == NULL)
1297 /* Check for enough room 2 for extension type, 2 for len
1300 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
1301 s2n(TLSEXT_TYPE_session_ticket,ret);
1305 memcpy(ret, s->session->tlsext_tick, ticklen);
1311 if (SSL_USE_SIGALGS(s))
1314 const unsigned char *salg;
1315 salglen = tls12_get_psigalgs(s, &salg);
1316 if ((size_t)(limit - ret) < salglen + 6)
1318 s2n(TLSEXT_TYPE_signature_algorithms,ret);
1319 s2n(salglen + 2, ret);
1321 memcpy(ret, salg, salglen);
1325 #ifdef TLSEXT_TYPE_opaque_prf_input
1326 if (s->s3->client_opaque_prf_input != NULL)
1328 size_t col = s->s3->client_opaque_prf_input_len;
1330 if ((long)(limit - ret - 6 - col < 0))
1332 if (col > 0xFFFD) /* can't happen */
1335 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1338 memcpy(ret, s->s3->client_opaque_prf_input, col);
1343 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1346 long extlen, idlen, itmp;
1350 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1352 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1353 itmp = i2d_OCSP_RESPID(id, NULL);
1359 if (s->tlsext_ocsp_exts)
1361 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1368 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1369 s2n(TLSEXT_TYPE_status_request, ret);
1370 if (extlen + idlen > 0xFFF0)
1372 s2n(extlen + idlen + 5, ret);
1373 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1375 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1377 /* save position of id len */
1378 unsigned char *q = ret;
1379 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1380 /* skip over id len */
1382 itmp = i2d_OCSP_RESPID(id, &ret);
1388 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1391 #ifndef OPENSSL_NO_HEARTBEATS
1392 /* Add Heartbeat extension */
1393 s2n(TLSEXT_TYPE_heartbeat,ret);
1396 * 1: peer may send requests
1397 * 2: peer not allowed to send requests
1399 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1400 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1402 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1405 #ifndef OPENSSL_NO_NEXTPROTONEG
1406 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1408 /* The client advertises an emtpy extension to indicate its
1409 * support for Next Protocol Negotiation */
1410 if (limit - ret - 4 < 0)
1412 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1417 if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
1419 if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
1421 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1422 s2n(2 + s->alpn_client_proto_list_len,ret);
1423 s2n(s->alpn_client_proto_list_len,ret);
1424 memcpy(ret, s->alpn_client_proto_list,
1425 s->alpn_client_proto_list_len);
1426 ret += s->alpn_client_proto_list_len;
1429 if(SSL_get_srtp_profiles(s))
1433 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1435 if((limit - p - 4 - el) < 0) return NULL;
1437 s2n(TLSEXT_TYPE_use_srtp,ret);
1440 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1442 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1448 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1449 /* 2 bytes for extension type */
1450 /* 2 bytes for extension length */
1451 /* 1 byte for the list length */
1452 /* 1 byte for the list (we only support audit proofs) */
1453 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1455 const unsigned short ext_len = 2;
1456 const unsigned char list_len = 1;
1458 if (limit < ret + 6)
1461 s2n(TLSEXT_TYPE_server_authz, ret);
1462 /* Extension length: 2 bytes */
1464 *(ret++) = list_len;
1465 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1468 /* Add custom TLS Extensions to ClientHello */
1469 if (s->ctx->custom_cli_ext_records_count)
1472 custom_cli_ext_record* record;
1474 for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
1476 const unsigned char* out = NULL;
1477 unsigned short outlen = 0;
1479 record = &s->ctx->custom_cli_ext_records[i];
1480 /* NULL callback sends empty extension */
1481 /* -1 from callback omits extension */
1485 cb_retval = record->fn1(s, record->ext_type,
1489 return NULL; /* error */
1490 if (cb_retval == -1)
1491 continue; /* skip this extension */
1493 if (limit < ret + 4 + outlen)
1495 s2n(record->ext_type, ret);
1497 memcpy(ret, out, outlen);
1502 if ((extdatalen = ret-p-2) == 0)
1509 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1512 unsigned char *ret = p;
1513 #ifndef OPENSSL_NO_NEXTPROTONEG
1514 int next_proto_neg_seen;
1516 #ifndef OPENSSL_NO_EC
1517 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1518 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1519 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1520 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1522 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1523 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
1527 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1529 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1531 if ((long)(limit - ret - 4) < 0) return NULL;
1533 s2n(TLSEXT_TYPE_server_name,ret);
1537 if(s->s3->send_connection_binding)
1541 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1543 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1547 if((limit - p - 4 - el) < 0) return NULL;
1549 s2n(TLSEXT_TYPE_renegotiate,ret);
1552 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1554 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1561 #ifndef OPENSSL_NO_EC
1564 const unsigned char *plist;
1566 /* Add TLS extension ECPointFormats to the ServerHello message */
1569 tls1_get_formatlist(s, &plist, &plistlen);
1571 if ((lenmax = limit - ret - 5) < 0) return NULL;
1572 if (plistlen > (size_t)lenmax) return NULL;
1575 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1579 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1580 s2n(plistlen + 1,ret);
1581 *(ret++) = (unsigned char) plistlen;
1582 memcpy(ret, plist, plistlen);
1586 /* Currently the server should not respond with a SupportedCurves extension */
1587 #endif /* OPENSSL_NO_EC */
1589 if (s->tlsext_ticket_expected
1590 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1592 if ((long)(limit - ret - 4) < 0) return NULL;
1593 s2n(TLSEXT_TYPE_session_ticket,ret);
1597 if (s->tlsext_status_expected)
1599 if ((long)(limit - ret - 4) < 0) return NULL;
1600 s2n(TLSEXT_TYPE_status_request,ret);
1604 #ifdef TLSEXT_TYPE_opaque_prf_input
1605 if (s->s3->server_opaque_prf_input != NULL)
1607 size_t sol = s->s3->server_opaque_prf_input_len;
1609 if ((long)(limit - ret - 6 - sol) < 0)
1611 if (sol > 0xFFFD) /* can't happen */
1614 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1617 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1626 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1628 if((limit - p - 4 - el) < 0) return NULL;
1630 s2n(TLSEXT_TYPE_use_srtp,ret);
1633 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1635 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1641 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1642 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1643 { const unsigned char cryptopro_ext[36] = {
1644 0xfd, 0xe8, /*65000*/
1645 0x00, 0x20, /*32 bytes length*/
1646 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1647 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1648 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1649 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1650 if (limit-ret<36) return NULL;
1651 memcpy(ret,cryptopro_ext,36);
1656 #ifndef OPENSSL_NO_HEARTBEATS
1657 /* Add Heartbeat extension if we've received one */
1658 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1660 s2n(TLSEXT_TYPE_heartbeat,ret);
1663 * 1: peer may send requests
1664 * 2: peer not allowed to send requests
1666 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1667 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1669 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1674 #ifndef OPENSSL_NO_NEXTPROTONEG
1675 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1676 s->s3->next_proto_neg_seen = 0;
1677 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1679 const unsigned char *npa;
1680 unsigned int npalen;
1683 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1684 if (r == SSL_TLSEXT_ERR_OK)
1686 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1687 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1689 memcpy(ret, npa, npalen);
1691 s->s3->next_proto_neg_seen = 1;
1696 /* If the client supports authz then see whether we have any to offer
1698 if (s->s3->tlsext_authz_client_types_len)
1700 size_t authz_length;
1701 /* By now we already know the new cipher, so we can look ahead
1702 * to see whether the cert we are going to send
1703 * has any authz data attached to it. */
1704 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1705 const unsigned char* const orig_authz = authz;
1707 unsigned authz_count = 0;
1709 /* The authz data contains a number of the following structures:
1710 * uint8_t authz_type
1712 * uint8_t data[length]
1714 * First we walk over it to find the number of authz elements. */
1715 for (i = 0; i < authz_length; i++)
1717 unsigned short length;
1721 if (memchr(s->s3->tlsext_authz_client_types,
1723 s->s3->tlsext_authz_client_types_len) != NULL)
1727 /* n2s increments authz by 2 */
1735 /* Add TLS extension server_authz to the ServerHello message
1736 * 2 bytes for extension type
1737 * 2 bytes for extension length
1738 * 1 byte for the list length
1739 * n bytes for the list */
1740 const unsigned short ext_len = 1 + authz_count;
1742 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1743 s2n(TLSEXT_TYPE_server_authz, ret);
1745 *(ret++) = authz_count;
1746 s->s3->tlsext_authz_promised_to_client = 1;
1750 for (i = 0; i < authz_length; i++)
1752 unsigned short length;
1757 if (memchr(s->s3->tlsext_authz_client_types,
1759 s->s3->tlsext_authz_client_types_len) != NULL)
1762 /* n2s increments authz by 2 */
1769 /* If custom types were sent in ClientHello, add ServerHello responses */
1770 if (s->s3->tlsext_custom_types_count)
1774 for (i = 0; i < s->s3->tlsext_custom_types_count; i++)
1777 custom_srv_ext_record *record;
1779 for (j = 0; j < s->ctx->custom_srv_ext_records_count; j++)
1781 record = &s->ctx->custom_srv_ext_records[j];
1782 if (s->s3->tlsext_custom_types[i] == record->ext_type)
1784 const unsigned char *out = NULL;
1785 unsigned short outlen = 0;
1788 /* NULL callback or -1 omits extension */
1791 cb_retval = record->fn2(s, record->ext_type,
1795 return NULL; /* error */
1796 if (cb_retval == -1)
1797 break; /* skip this extension */
1798 if (limit < ret + 4 + outlen)
1800 s2n(record->ext_type, ret);
1802 memcpy(ret, out, outlen);
1810 if (s->s3->alpn_selected)
1812 const unsigned char *selected = s->s3->alpn_selected;
1813 unsigned len = s->s3->alpn_selected_len;
1815 if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
1817 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1821 memcpy(ret, selected, len);
1825 if ((extdatalen = ret-p-2)== 0)
1832 /* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
1834 * data: the contents of the extension, not including the type and length.
1835 * data_len: the number of bytes in |data|
1836 * al: a pointer to the alert value to send in the event of a non-zero
1839 * returns: 0 on success. */
1840 static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
1841 unsigned data_len, int *al)
1845 const unsigned char *selected;
1846 unsigned char selected_len;
1849 if (s->ctx->alpn_select_cb == NULL)
1855 /* data should contain a uint16 length followed by a series of 8-bit,
1856 * length-prefixed strings. */
1857 i = ((unsigned) data[0]) << 8 |
1858 ((unsigned) data[1]);
1867 for (i = 0; i < data_len;)
1869 proto_len = data[i];
1875 if (i + proto_len < i || i + proto_len > data_len)
1881 r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
1882 s->ctx->alpn_select_cb_arg);
1883 if (r == SSL_TLSEXT_ERR_OK) {
1884 if (s->s3->alpn_selected)
1885 OPENSSL_free(s->s3->alpn_selected);
1886 s->s3->alpn_selected = OPENSSL_malloc(selected_len);
1887 if (!s->s3->alpn_selected)
1889 *al = SSL_AD_INTERNAL_ERROR;
1892 memcpy(s->s3->alpn_selected, selected, selected_len);
1893 s->s3->alpn_selected_len = selected_len;
1898 *al = SSL_AD_DECODE_ERROR;
1902 static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1904 unsigned short type;
1905 unsigned short size;
1907 unsigned char *data = *p;
1908 int renegotiate_seen = 0;
1911 s->servername_done = 0;
1912 s->tlsext_status_type = -1;
1913 #ifndef OPENSSL_NO_NEXTPROTONEG
1914 s->s3->next_proto_neg_seen = 0;
1917 if (s->s3->alpn_selected)
1919 OPENSSL_free(s->s3->alpn_selected);
1920 s->s3->alpn_selected = NULL;
1923 /* Clear observed custom extensions */
1924 s->s3->tlsext_custom_types_count = 0;
1925 if (s->s3->tlsext_custom_types != NULL)
1927 OPENSSL_free(s->s3->tlsext_custom_types);
1928 s->s3->tlsext_custom_types = NULL;
1931 #ifndef OPENSSL_NO_HEARTBEATS
1932 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1933 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1935 /* Clear any signature algorithms extension received */
1936 if (s->cert->peer_sigalgs)
1938 OPENSSL_free(s->cert->peer_sigalgs);
1939 s->cert->peer_sigalgs = NULL;
1941 /* Clear any shared sigtnature algorithms */
1942 if (s->cert->shared_sigalgs)
1944 OPENSSL_free(s->cert->shared_sigalgs);
1945 s->cert->shared_sigalgs = NULL;
1947 /* Clear certificate digests and validity flags */
1948 for (i = 0; i < SSL_PKEY_NUM; i++)
1950 s->cert->pkeys[i].digest = NULL;
1951 s->cert->pkeys[i].valid_flags = 0;
1954 if (data >= (d+n-2))
1958 if (data > (d+n-len))
1961 while (data <= (d+n-4))
1966 if (data+size > (d+n))
1969 fprintf(stderr,"Received extension type %d size %d\n",type,size);
1971 if (s->tlsext_debug_cb)
1972 s->tlsext_debug_cb(s, 0, type, data, size,
1973 s->tlsext_debug_arg);
1974 /* The servername extension is treated as follows:
1976 - Only the hostname type is supported with a maximum length of 255.
1977 - The servername is rejected if too long or if it contains zeros,
1978 in which case an fatal alert is generated.
1979 - The servername field is maintained together with the session cache.
1980 - When a session is resumed, the servername call back invoked in order
1981 to allow the application to position itself to the right context.
1982 - The servername is acknowledged if it is new for a session or when
1983 it is identical to a previously used for the same session.
1984 Applications can control the behaviour. They can at any time
1985 set a 'desirable' servername for a new SSL object. This can be the
1986 case for example with HTTPS when a Host: header field is received and
1987 a renegotiation is requested. In this case, a possible servername
1988 presented in the new client hello is only acknowledged if it matches
1989 the value of the Host: field.
1990 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1991 if they provide for changing an explicit servername context for the session,
1992 i.e. when the session has been established with a servername extension.
1993 - On session reconnect, the servername extension may be absent.
1997 if (type == TLSEXT_TYPE_server_name)
1999 unsigned char *sdata;
2005 *al = SSL_AD_DECODE_ERROR;
2012 *al = SSL_AD_DECODE_ERROR;
2019 servname_type = *(sdata++);
2025 *al = SSL_AD_DECODE_ERROR;
2028 if (s->servername_done == 0)
2029 switch (servname_type)
2031 case TLSEXT_NAMETYPE_host_name:
2034 if(s->session->tlsext_hostname)
2036 *al = SSL_AD_DECODE_ERROR;
2039 if (len > TLSEXT_MAXLEN_host_name)
2041 *al = TLS1_AD_UNRECOGNIZED_NAME;
2044 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
2046 *al = TLS1_AD_INTERNAL_ERROR;
2049 memcpy(s->session->tlsext_hostname, sdata, len);
2050 s->session->tlsext_hostname[len]='\0';
2051 if (strlen(s->session->tlsext_hostname) != len) {
2052 OPENSSL_free(s->session->tlsext_hostname);
2053 s->session->tlsext_hostname = NULL;
2054 *al = TLS1_AD_UNRECOGNIZED_NAME;
2057 s->servername_done = 1;
2061 s->servername_done = s->session->tlsext_hostname
2062 && strlen(s->session->tlsext_hostname) == len
2063 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
2075 *al = SSL_AD_DECODE_ERROR;
2080 #ifndef OPENSSL_NO_SRP
2081 else if (type == TLSEXT_TYPE_srp)
2083 if (size <= 0 || ((len = data[0])) != (size -1))
2085 *al = SSL_AD_DECODE_ERROR;
2088 if (s->srp_ctx.login != NULL)
2090 *al = SSL_AD_DECODE_ERROR;
2093 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
2095 memcpy(s->srp_ctx.login, &data[1], len);
2096 s->srp_ctx.login[len]='\0';
2098 if (strlen(s->srp_ctx.login) != len)
2100 *al = SSL_AD_DECODE_ERROR;
2106 #ifndef OPENSSL_NO_EC
2107 else if (type == TLSEXT_TYPE_ec_point_formats)
2109 unsigned char *sdata = data;
2110 int ecpointformatlist_length = *(sdata++);
2112 if (ecpointformatlist_length != size - 1 ||
2113 ecpointformatlist_length < 1)
2115 *al = TLS1_AD_DECODE_ERROR;
2120 if(s->session->tlsext_ecpointformatlist)
2122 OPENSSL_free(s->session->tlsext_ecpointformatlist);
2123 s->session->tlsext_ecpointformatlist = NULL;
2125 s->session->tlsext_ecpointformatlist_length = 0;
2126 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2128 *al = TLS1_AD_INTERNAL_ERROR;
2131 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2132 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2135 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
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 else if (type == TLSEXT_TYPE_elliptic_curves)
2144 unsigned char *sdata = data;
2145 int ellipticcurvelist_length = (*(sdata++) << 8);
2146 ellipticcurvelist_length += (*(sdata++));
2148 if (ellipticcurvelist_length != size - 2 ||
2149 ellipticcurvelist_length < 1)
2151 *al = TLS1_AD_DECODE_ERROR;
2156 if(s->session->tlsext_ellipticcurvelist)
2158 *al = TLS1_AD_DECODE_ERROR;
2161 s->session->tlsext_ellipticcurvelist_length = 0;
2162 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
2164 *al = TLS1_AD_INTERNAL_ERROR;
2167 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
2168 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
2171 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
2172 sdata = s->session->tlsext_ellipticcurvelist;
2173 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
2174 fprintf(stderr,"%i ",*(sdata++));
2175 fprintf(stderr,"\n");
2178 #endif /* OPENSSL_NO_EC */
2179 #ifdef TLSEXT_TYPE_opaque_prf_input
2180 else if (type == TLSEXT_TYPE_opaque_prf_input)
2182 unsigned char *sdata = data;
2186 *al = SSL_AD_DECODE_ERROR;
2189 n2s(sdata, s->s3->client_opaque_prf_input_len);
2190 if (s->s3->client_opaque_prf_input_len != size - 2)
2192 *al = SSL_AD_DECODE_ERROR;
2196 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2197 OPENSSL_free(s->s3->client_opaque_prf_input);
2198 if (s->s3->client_opaque_prf_input_len == 0)
2199 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2201 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
2202 if (s->s3->client_opaque_prf_input == NULL)
2204 *al = TLS1_AD_INTERNAL_ERROR;
2209 else if (type == TLSEXT_TYPE_session_ticket)
2211 if (s->tls_session_ticket_ext_cb &&
2212 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2214 *al = TLS1_AD_INTERNAL_ERROR;
2218 else if (type == TLSEXT_TYPE_renegotiate)
2220 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
2222 renegotiate_seen = 1;
2224 else if (type == TLSEXT_TYPE_signature_algorithms)
2227 if (s->cert->peer_sigalgs || size < 2)
2229 *al = SSL_AD_DECODE_ERROR;
2234 if (dsize != size || dsize & 1 || !dsize)
2236 *al = SSL_AD_DECODE_ERROR;
2239 if (!tls1_process_sigalgs(s, data, dsize))
2241 *al = SSL_AD_DECODE_ERROR;
2244 /* If sigalgs received and no shared algorithms fatal
2247 if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
2249 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2250 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
2251 *al = SSL_AD_ILLEGAL_PARAMETER;
2255 else if (type == TLSEXT_TYPE_status_request
2256 && s->ctx->tlsext_status_cb)
2261 *al = SSL_AD_DECODE_ERROR;
2265 s->tlsext_status_type = *data++;
2267 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
2269 const unsigned char *sdata;
2271 /* Read in responder_id_list */
2276 *al = SSL_AD_DECODE_ERROR;
2285 *al = SSL_AD_DECODE_ERROR;
2289 dsize -= 2 + idsize;
2293 *al = SSL_AD_DECODE_ERROR;
2298 id = d2i_OCSP_RESPID(NULL,
2302 *al = SSL_AD_DECODE_ERROR;
2307 OCSP_RESPID_free(id);
2308 *al = SSL_AD_DECODE_ERROR;
2311 if (!s->tlsext_ocsp_ids
2312 && !(s->tlsext_ocsp_ids =
2313 sk_OCSP_RESPID_new_null()))
2315 OCSP_RESPID_free(id);
2316 *al = SSL_AD_INTERNAL_ERROR;
2319 if (!sk_OCSP_RESPID_push(
2320 s->tlsext_ocsp_ids, id))
2322 OCSP_RESPID_free(id);
2323 *al = SSL_AD_INTERNAL_ERROR;
2328 /* Read in request_extensions */
2331 *al = SSL_AD_DECODE_ERROR;
2338 *al = SSL_AD_DECODE_ERROR;
2344 if (s->tlsext_ocsp_exts)
2346 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2347 X509_EXTENSION_free);
2350 s->tlsext_ocsp_exts =
2351 d2i_X509_EXTENSIONS(NULL,
2353 if (!s->tlsext_ocsp_exts
2354 || (data + dsize != sdata))
2356 *al = SSL_AD_DECODE_ERROR;
2361 /* We don't know what to do with any other type
2365 s->tlsext_status_type = -1;
2367 #ifndef OPENSSL_NO_HEARTBEATS
2368 else if (type == TLSEXT_TYPE_heartbeat)
2372 case 0x01: /* Client allows us to send HB requests */
2373 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2375 case 0x02: /* Client doesn't accept HB requests */
2376 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2377 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2379 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2384 #ifndef OPENSSL_NO_NEXTPROTONEG
2385 else if (type == TLSEXT_TYPE_next_proto_neg &&
2386 s->s3->tmp.finish_md_len == 0 &&
2387 s->s3->alpn_selected == NULL)
2389 /* We shouldn't accept this extension on a
2392 * s->new_session will be set on renegotiation, but we
2393 * probably shouldn't rely that it couldn't be set on
2394 * the initial renegotation too in certain cases (when
2395 * there's some other reason to disallow resuming an
2396 * earlier session -- the current code won't be doing
2397 * anything like that, but this might change).
2399 * A valid sign that there's been a previous handshake
2400 * in this connection is if s->s3->tmp.finish_md_len >
2401 * 0. (We are talking about a check that will happen
2402 * in the Hello protocol round, well before a new
2403 * Finished message could have been computed.) */
2404 s->s3->next_proto_neg_seen = 1;
2408 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
2409 s->ctx->alpn_select_cb &&
2410 s->s3->tmp.finish_md_len == 0)
2412 if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
2414 /* ALPN takes precedence over NPN. */
2415 s->s3->next_proto_neg_seen = 0;
2418 /* session ticket processed earlier */
2419 else if (type == TLSEXT_TYPE_use_srtp)
2421 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
2426 else if (type == TLSEXT_TYPE_server_authz)
2428 unsigned char *sdata = data;
2429 unsigned char server_authz_dataformatlist_length;
2433 *al = TLS1_AD_DECODE_ERROR;
2437 server_authz_dataformatlist_length = *(sdata++);
2439 if (server_authz_dataformatlist_length != size - 1)
2441 *al = TLS1_AD_DECODE_ERROR;
2445 /* Successful session resumption uses the same authz
2446 * information as the original session so we ignore this
2447 * in the case of a session resumption. */
2450 if (s->s3->tlsext_authz_client_types != NULL)
2451 OPENSSL_free(s->s3->tlsext_authz_client_types);
2452 s->s3->tlsext_authz_client_types =
2453 OPENSSL_malloc(server_authz_dataformatlist_length);
2454 if (!s->s3->tlsext_authz_client_types)
2456 *al = TLS1_AD_INTERNAL_ERROR;
2460 s->s3->tlsext_authz_client_types_len =
2461 server_authz_dataformatlist_length;
2462 memcpy(s->s3->tlsext_authz_client_types,
2464 server_authz_dataformatlist_length);
2466 /* Sort the types in order to check for duplicates. */
2467 qsort(s->s3->tlsext_authz_client_types,
2468 server_authz_dataformatlist_length,
2469 1 /* element size */,
2472 for (i = 0; i < server_authz_dataformatlist_length; i++)
2475 s->s3->tlsext_authz_client_types[i] ==
2476 s->s3->tlsext_authz_client_types[i-1])
2478 *al = TLS1_AD_DECODE_ERROR;
2485 /* If this ClientHello extension was unhandled and this is
2486 * a nonresumed connection, check whether the extension is a
2487 * custom TLS Extension (has a custom_srv_ext_record), and if
2488 * so call the callback and record the extension number so that
2489 * an appropriate ServerHello may be later returned.
2491 else if (!s->hit && s->ctx->custom_srv_ext_records_count)
2493 custom_srv_ext_record *record;
2495 for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
2497 record = &s->ctx->custom_srv_ext_records[i];
2498 if (type == record->ext_type)
2502 /* Error on duplicate TLS Extensions */
2503 for (j = 0; j < s->s3->tlsext_custom_types_count; j++)
2505 if (type == s->s3->tlsext_custom_types[j])
2507 *al = TLS1_AD_DECODE_ERROR;
2512 /* NULL callback still notes the extension */
2513 if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
2516 /* Add the (non-duplicated) entry */
2517 s->s3->tlsext_custom_types_count++;
2518 s->s3->tlsext_custom_types = OPENSSL_realloc(
2519 s->s3->tlsext_custom_types,
2520 s->s3->tlsext_custom_types_count * 2);
2521 if (s->s3->tlsext_custom_types == NULL)
2523 s->s3->tlsext_custom_types = 0;
2524 *al = TLS1_AD_INTERNAL_ERROR;
2527 s->s3->tlsext_custom_types[
2528 s->s3->tlsext_custom_types_count - 1] = type;
2540 /* Need RI if renegotiating */
2542 if (!renegotiate_seen && s->renegotiate &&
2543 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2545 *al = SSL_AD_HANDSHAKE_FAILURE;
2546 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2547 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2550 /* If no signature algorithms extension set default values */
2551 if (!s->cert->peer_sigalgs)
2552 ssl_cert_set_default_md(s->cert);
2557 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2560 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2562 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2566 if (ssl_check_clienthello_tlsext_early(s) <= 0)
2568 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
2574 #ifndef OPENSSL_NO_NEXTPROTONEG
2575 /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2576 * elements of zero length are allowed and the set of elements must exactly fill
2577 * the length of the block. */
2578 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
2580 unsigned int off = 0;
2594 static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
2596 unsigned short length;
2597 unsigned short type;
2598 unsigned short size;
2599 unsigned char *data = *p;
2600 int tlsext_servername = 0;
2601 int renegotiate_seen = 0;
2603 #ifndef OPENSSL_NO_NEXTPROTONEG
2604 s->s3->next_proto_neg_seen = 0;
2607 if (s->s3->alpn_selected)
2609 OPENSSL_free(s->s3->alpn_selected);
2610 s->s3->alpn_selected = NULL;
2613 #ifndef OPENSSL_NO_HEARTBEATS
2614 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2615 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2618 if (data >= (d+n-2))
2622 if (data+length != d+n)
2624 *al = SSL_AD_DECODE_ERROR;
2628 while(data <= (d+n-4))
2633 if (data+size > (d+n))
2636 if (s->tlsext_debug_cb)
2637 s->tlsext_debug_cb(s, 1, type, data, size,
2638 s->tlsext_debug_arg);
2640 if (type == TLSEXT_TYPE_server_name)
2642 if (s->tlsext_hostname == NULL || size > 0)
2644 *al = TLS1_AD_UNRECOGNIZED_NAME;
2647 tlsext_servername = 1;
2650 #ifndef OPENSSL_NO_EC
2651 else if (type == TLSEXT_TYPE_ec_point_formats)
2653 unsigned char *sdata = data;
2654 int ecpointformatlist_length = *(sdata++);
2656 if (ecpointformatlist_length != size - 1)
2658 *al = TLS1_AD_DECODE_ERROR;
2661 s->session->tlsext_ecpointformatlist_length = 0;
2662 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2663 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2665 *al = TLS1_AD_INTERNAL_ERROR;
2668 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2669 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
2671 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2672 sdata = s->session->tlsext_ecpointformatlist;
2673 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2674 fprintf(stderr,"%i ",*(sdata++));
2675 fprintf(stderr,"\n");
2678 #endif /* OPENSSL_NO_EC */
2680 else if (type == TLSEXT_TYPE_session_ticket)
2682 if (s->tls_session_ticket_ext_cb &&
2683 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2685 *al = TLS1_AD_INTERNAL_ERROR;
2688 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
2691 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2694 s->tlsext_ticket_expected = 1;
2696 #ifdef TLSEXT_TYPE_opaque_prf_input
2697 else if (type == TLSEXT_TYPE_opaque_prf_input)
2699 unsigned char *sdata = data;
2703 *al = SSL_AD_DECODE_ERROR;
2706 n2s(sdata, s->s3->server_opaque_prf_input_len);
2707 if (s->s3->server_opaque_prf_input_len != size - 2)
2709 *al = SSL_AD_DECODE_ERROR;
2713 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2714 OPENSSL_free(s->s3->server_opaque_prf_input);
2715 if (s->s3->server_opaque_prf_input_len == 0)
2716 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2718 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
2720 if (s->s3->server_opaque_prf_input == NULL)
2722 *al = TLS1_AD_INTERNAL_ERROR;
2727 else if (type == TLSEXT_TYPE_status_request)
2729 /* MUST be empty and only sent if we've requested
2730 * a status request message.
2732 if ((s->tlsext_status_type == -1) || (size > 0))
2734 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2737 /* Set flag to expect CertificateStatus message */
2738 s->tlsext_status_expected = 1;
2740 #ifndef OPENSSL_NO_NEXTPROTONEG
2741 else if (type == TLSEXT_TYPE_next_proto_neg &&
2742 s->s3->tmp.finish_md_len == 0)
2744 unsigned char *selected;
2745 unsigned char selected_len;
2747 /* We must have requested it. */
2748 if (s->ctx->next_proto_select_cb == NULL)
2750 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2753 /* The data must be valid */
2754 if (!ssl_next_proto_validate(data, size))
2756 *al = TLS1_AD_DECODE_ERROR;
2759 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2761 *al = TLS1_AD_INTERNAL_ERROR;
2764 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2765 if (!s->next_proto_negotiated)
2767 *al = TLS1_AD_INTERNAL_ERROR;
2770 memcpy(s->next_proto_negotiated, selected, selected_len);
2771 s->next_proto_negotiated_len = selected_len;
2772 s->s3->next_proto_neg_seen = 1;
2776 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
2780 /* We must have requested it. */
2781 if (s->alpn_client_proto_list == NULL)
2783 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2788 *al = TLS1_AD_DECODE_ERROR;
2791 /* The extension data consists of:
2792 * uint16 list_length
2793 * uint8 proto_length;
2794 * uint8 proto[proto_length]; */
2798 if (len != (unsigned) size - 2)
2800 *al = TLS1_AD_DECODE_ERROR;
2804 if (len != (unsigned) size - 3)
2806 *al = TLS1_AD_DECODE_ERROR;
2809 if (s->s3->alpn_selected)
2810 OPENSSL_free(s->s3->alpn_selected);
2811 s->s3->alpn_selected = OPENSSL_malloc(len);
2812 if (!s->s3->alpn_selected)
2814 *al = TLS1_AD_INTERNAL_ERROR;
2817 memcpy(s->s3->alpn_selected, data + 3, len);
2818 s->s3->alpn_selected_len = len;
2821 else if (type == TLSEXT_TYPE_renegotiate)
2823 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2825 renegotiate_seen = 1;
2827 #ifndef OPENSSL_NO_HEARTBEATS
2828 else if (type == TLSEXT_TYPE_heartbeat)
2832 case 0x01: /* Server allows us to send HB requests */
2833 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2835 case 0x02: /* Server doesn't accept HB requests */
2836 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2837 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2839 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2844 else if (type == TLSEXT_TYPE_use_srtp)
2846 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2851 else if (type == TLSEXT_TYPE_server_authz)
2853 /* We only support audit proofs. It's an error to send
2854 * an authz hello extension if the client
2855 * didn't request a proof. */
2856 unsigned char *sdata = data;
2857 unsigned char server_authz_dataformatlist_length;
2859 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2861 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2867 *al = TLS1_AD_DECODE_ERROR;
2871 server_authz_dataformatlist_length = *(sdata++);
2872 if (server_authz_dataformatlist_length != size - 1)
2874 *al = TLS1_AD_DECODE_ERROR;
2878 /* We only support audit proofs, so a legal ServerHello
2879 * authz list contains exactly one entry. */
2880 if (server_authz_dataformatlist_length != 1 ||
2881 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2883 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2887 s->s3->tlsext_authz_server_promised = 1;
2890 /* If this extension type was not otherwise handled, but
2891 * matches a custom_cli_ext_record, then send it to the c
2893 else if (s->ctx->custom_cli_ext_records_count)
2896 custom_cli_ext_record* record;
2898 for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
2900 record = &s->ctx->custom_cli_ext_records[i];
2901 if (record->ext_type == type)
2903 if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))
2915 *al = SSL_AD_DECODE_ERROR;
2919 if (!s->hit && tlsext_servername == 1)
2921 if (s->tlsext_hostname)
2923 if (s->session->tlsext_hostname == NULL)
2925 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2926 if (!s->session->tlsext_hostname)
2928 *al = SSL_AD_UNRECOGNIZED_NAME;
2934 *al = SSL_AD_DECODE_ERROR;
2944 /* Determine if we need to see RI. Strictly speaking if we want to
2945 * avoid an attack we should *always* see RI even on initial server
2946 * hello because the client doesn't see any renegotiation during an
2947 * attack. However this would mean we could not connect to any server
2948 * which doesn't support RI so for the immediate future tolerate RI
2949 * absence on initial connect only.
2951 if (!renegotiate_seen
2952 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2953 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2955 *al = SSL_AD_HANDSHAKE_FAILURE;
2956 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2957 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2965 int ssl_prepare_clienthello_tlsext(SSL *s)
2968 #ifdef TLSEXT_TYPE_opaque_prf_input
2972 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2974 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2979 if (s->tlsext_opaque_prf_input != NULL)
2981 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2982 OPENSSL_free(s->s3->client_opaque_prf_input);
2984 if (s->tlsext_opaque_prf_input_len == 0)
2985 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2987 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
2988 if (s->s3->client_opaque_prf_input == NULL)
2990 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2993 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2997 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2998 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
3005 int ssl_prepare_serverhello_tlsext(SSL *s)
3010 static int ssl_check_clienthello_tlsext_early(SSL *s)
3012 int ret=SSL_TLSEXT_ERR_NOACK;
3013 int al = SSL_AD_UNRECOGNIZED_NAME;
3015 #ifndef OPENSSL_NO_EC
3016 /* The handling of the ECPointFormats extension is done elsewhere, namely in
3017 * ssl3_choose_cipher in s3_lib.c.
3019 /* The handling of the EllipticCurves extension is done elsewhere, namely in
3020 * ssl3_choose_cipher in s3_lib.c.
3024 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3025 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
3026 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
3027 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
3029 #ifdef TLSEXT_TYPE_opaque_prf_input
3031 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
3032 * but we might be sending an alert in response to the client hello,
3033 * so this has to happen here in
3034 * ssl_check_clienthello_tlsext_early(). */
3038 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
3040 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
3043 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3044 al = SSL_AD_INTERNAL_ERROR;
3049 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
3050 OPENSSL_free(s->s3->server_opaque_prf_input);
3051 s->s3->server_opaque_prf_input = NULL;
3053 if (s->tlsext_opaque_prf_input != NULL)
3055 if (s->s3->client_opaque_prf_input != NULL &&
3056 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
3058 /* can only use this extension if we have a server opaque PRF input
3059 * of the same length as the client opaque PRF input! */
3061 if (s->tlsext_opaque_prf_input_len == 0)
3062 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
3064 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
3065 if (s->s3->server_opaque_prf_input == NULL)
3067 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3068 al = SSL_AD_INTERNAL_ERROR;
3071 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
3075 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
3077 /* The callback wants to enforce use of the extension,
3078 * but we can't do that with the client opaque PRF input;
3079 * abort the handshake.
3081 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3082 al = SSL_AD_HANDSHAKE_FAILURE;
3090 case SSL_TLSEXT_ERR_ALERT_FATAL:
3091 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3094 case SSL_TLSEXT_ERR_ALERT_WARNING:
3095 ssl3_send_alert(s,SSL3_AL_WARNING,al);
3098 case SSL_TLSEXT_ERR_NOACK:
3099 s->servername_done=0;
3105 int ssl_check_clienthello_tlsext_late(SSL *s)
3107 int ret = SSL_TLSEXT_ERR_OK;
3110 /* If status request then ask callback what to do.
3111 * Note: this must be called after servername callbacks in case
3112 * the certificate has changed, and must be called after the cipher
3113 * has been chosen because this may influence which certificate is sent
3115 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
3118 CERT_PKEY *certpkey;
3119 certpkey = ssl_get_server_send_pkey(s);
3120 /* If no certificate can't return certificate status */
3121 if (certpkey == NULL)
3123 s->tlsext_status_expected = 0;
3126 /* Set current certificate to one we will use so
3127 * SSL_get_certificate et al can pick it up.
3129 s->cert->key = certpkey;
3130 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3133 /* We don't want to send a status request response */
3134 case SSL_TLSEXT_ERR_NOACK:
3135 s->tlsext_status_expected = 0;
3137 /* status request response should be sent */
3138 case SSL_TLSEXT_ERR_OK:
3139 if (s->tlsext_ocsp_resp)
3140 s->tlsext_status_expected = 1;
3142 s->tlsext_status_expected = 0;
3144 /* something bad happened */
3145 case SSL_TLSEXT_ERR_ALERT_FATAL:
3146 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3147 al = SSL_AD_INTERNAL_ERROR;
3152 s->tlsext_status_expected = 0;
3157 case SSL_TLSEXT_ERR_ALERT_FATAL:
3158 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3161 case SSL_TLSEXT_ERR_ALERT_WARNING:
3162 ssl3_send_alert(s, SSL3_AL_WARNING, al);
3170 int ssl_check_serverhello_tlsext(SSL *s)
3172 int ret=SSL_TLSEXT_ERR_NOACK;
3173 int al = SSL_AD_UNRECOGNIZED_NAME;
3175 #ifndef OPENSSL_NO_EC
3176 /* If we are client and using an elliptic curve cryptography cipher
3177 * suite, then if server returns an EC point formats lists extension
3178 * it must contain uncompressed.
3180 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3181 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3182 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
3183 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
3184 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
3186 /* we are using an ECC cipher */
3188 unsigned char *list;
3189 int found_uncompressed = 0;
3190 list = s->session->tlsext_ecpointformatlist;
3191 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
3193 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
3195 found_uncompressed = 1;
3199 if (!found_uncompressed)
3201 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
3205 ret = SSL_TLSEXT_ERR_OK;
3206 #endif /* OPENSSL_NO_EC */
3208 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3209 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
3210 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
3211 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
3213 #ifdef TLSEXT_TYPE_opaque_prf_input
3214 if (s->s3->server_opaque_prf_input_len > 0)
3216 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
3217 * So first verify that we really have a value from the server too. */
3219 if (s->s3->server_opaque_prf_input == NULL)
3221 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3222 al = SSL_AD_HANDSHAKE_FAILURE;
3225 /* Anytime the server *has* sent an opaque PRF input, we need to check
3226 * that we have a client opaque PRF input of the same size. */
3227 if (s->s3->client_opaque_prf_input == NULL ||
3228 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
3230 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3231 al = SSL_AD_ILLEGAL_PARAMETER;
3236 /* If we've requested certificate status and we wont get one
3239 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
3240 && s->ctx && s->ctx->tlsext_status_cb)
3243 /* Set resp to NULL, resplen to -1 so callback knows
3244 * there is no response.
3246 if (s->tlsext_ocsp_resp)
3248 OPENSSL_free(s->tlsext_ocsp_resp);
3249 s->tlsext_ocsp_resp = NULL;
3251 s->tlsext_ocsp_resplen = -1;
3252 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3255 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
3256 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3260 al = SSL_AD_INTERNAL_ERROR;
3261 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3267 case SSL_TLSEXT_ERR_ALERT_FATAL:
3268 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3271 case SSL_TLSEXT_ERR_ALERT_WARNING:
3272 ssl3_send_alert(s,SSL3_AL_WARNING,al);
3275 case SSL_TLSEXT_ERR_NOACK:
3276 s->servername_done=0;
3282 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
3285 if (s->version < SSL3_VERSION)
3287 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
3289 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3293 if (ssl_check_serverhello_tlsext(s) <= 0)
3295 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
3301 /* Since the server cache lookup is done early on in the processing of the
3302 * ClientHello, and other operations depend on the result, we need to handle
3303 * any TLS session ticket extension at the same time.
3305 * session_id: points at the session ID in the ClientHello. This code will
3306 * read past the end of this in order to parse out the session ticket
3307 * extension, if any.
3308 * len: the length of the session ID.
3309 * limit: a pointer to the first byte after the ClientHello.
3310 * ret: (output) on return, if a ticket was decrypted, then this is set to
3311 * point to the resulting session.
3313 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3314 * ciphersuite, in which case we have no use for session tickets and one will
3315 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3318 * -1: fatal error, either from parsing or decrypting the ticket.
3319 * 0: no ticket was found (or was ignored, based on settings).
3320 * 1: a zero length extension was found, indicating that the client supports
3321 * session tickets but doesn't currently have one to offer.
3322 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
3323 * couldn't be decrypted because of a non-fatal error.
3324 * 3: a ticket was successfully decrypted and *ret was set.
3327 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3328 * a new session ticket to the client because the client indicated support
3329 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3330 * a session ticket or we couldn't use the one it gave us, or if
3331 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3332 * Otherwise, s->tlsext_ticket_expected is set to 0.
3334 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
3335 const unsigned char *limit, SSL_SESSION **ret)
3337 /* Point after session ID in client hello */
3338 const unsigned char *p = session_id + len;
3342 s->tlsext_ticket_expected = 0;
3344 /* If tickets disabled behave as if no ticket present
3345 * to permit stateful resumption.
3347 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
3349 if ((s->version <= SSL3_VERSION) || !limit)
3353 /* Skip past DTLS cookie */
3361 /* Skip past cipher list */
3366 /* Skip past compression algorithm list */
3371 /* Now at start of extensions */
3372 if ((p + 2) >= limit)
3375 while ((p + 4) <= limit)
3377 unsigned short type, size;
3380 if (p + size > limit)
3382 if (type == TLSEXT_TYPE_session_ticket)
3387 /* The client will accept a ticket but doesn't
3388 * currently have one. */
3389 s->tlsext_ticket_expected = 1;
3392 if (s->tls_session_secret_cb)
3394 /* Indicate that the ticket couldn't be
3395 * decrypted rather than generating the session
3396 * from ticket now, trigger abbreviated
3397 * handshake based on external mechanism to
3398 * calculate the master secret later. */
3401 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
3404 case 2: /* ticket couldn't be decrypted */
3405 s->tlsext_ticket_expected = 1;
3407 case 3: /* ticket was decrypted */
3409 case 4: /* ticket decrypted but need to renew */
3410 s->tlsext_ticket_expected = 1;
3412 default: /* fatal error */
3421 /* tls_decrypt_ticket attempts to decrypt a session ticket.
3423 * etick: points to the body of the session ticket extension.
3424 * eticklen: the length of the session tickets extenion.
3425 * sess_id: points at the session ID.
3426 * sesslen: the length of the session ID.
3427 * psess: (output) on return, if a ticket was decrypted, then this is set to
3428 * point to the resulting session.
3431 * -1: fatal error, either from parsing or decrypting the ticket.
3432 * 2: the ticket couldn't be decrypted.
3433 * 3: a ticket was successfully decrypted and *psess was set.
3434 * 4: same as 3, but the ticket needs to be renewed.
3436 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
3437 const unsigned char *sess_id, int sesslen,
3438 SSL_SESSION **psess)
3441 unsigned char *sdec;
3442 const unsigned char *p;
3443 int slen, mlen, renew_ticket = 0;
3444 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3447 SSL_CTX *tctx = s->initial_ctx;
3448 /* Need at least keyname + iv + some encrypted data */
3451 /* Initialize session ticket encryption and HMAC contexts */
3452 HMAC_CTX_init(&hctx);
3453 EVP_CIPHER_CTX_init(&ctx);
3454 if (tctx->tlsext_ticket_key_cb)
3456 unsigned char *nctick = (unsigned char *)etick;
3457 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
3468 /* Check key name matches */
3469 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
3471 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3472 tlsext_tick_md(), NULL);
3473 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3474 tctx->tlsext_tick_aes_key, etick + 16);
3476 /* Attempt to process session ticket, first conduct sanity and
3477 * integrity checks on ticket.
3479 mlen = HMAC_size(&hctx);
3482 EVP_CIPHER_CTX_cleanup(&ctx);
3486 /* Check HMAC of encrypted ticket */
3487 HMAC_Update(&hctx, etick, eticklen);
3488 HMAC_Final(&hctx, tick_hmac, NULL);
3489 HMAC_CTX_cleanup(&hctx);
3490 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
3492 /* Attempt to decrypt session data */
3493 /* Move p after IV to start of encrypted ticket, update length */
3494 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3495 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3496 sdec = OPENSSL_malloc(eticklen);
3499 EVP_CIPHER_CTX_cleanup(&ctx);
3502 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
3503 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
3506 EVP_CIPHER_CTX_cleanup(&ctx);
3509 sess = d2i_SSL_SESSION(NULL, &p, slen);
3513 /* The session ID, if non-empty, is used by some clients to
3514 * detect that the ticket has been accepted. So we copy it to
3515 * the session structure. If it is empty set length to zero
3516 * as required by standard.
3519 memcpy(sess->session_id, sess_id, sesslen);
3520 sess->session_id_length = sesslen;
3528 /* For session parse failure, indicate that we need to send a new
3533 /* Tables to translate from NIDs to TLS v1.2 ids */
3541 static tls12_lookup tls12_md[] = {
3542 {NID_md5, TLSEXT_hash_md5},
3543 {NID_sha1, TLSEXT_hash_sha1},
3544 {NID_sha224, TLSEXT_hash_sha224},
3545 {NID_sha256, TLSEXT_hash_sha256},
3546 {NID_sha384, TLSEXT_hash_sha384},
3547 {NID_sha512, TLSEXT_hash_sha512}
3550 static tls12_lookup tls12_sig[] = {
3551 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
3552 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
3553 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
3556 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
3559 for (i = 0; i < tlen; i++)
3561 if (table[i].nid == nid)
3567 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
3570 for (i = 0; i < tlen; i++)
3572 if ((table[i].id) == id)
3573 return table[i].nid;
3578 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
3583 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3584 sizeof(tls12_md)/sizeof(tls12_lookup));
3587 sig_id = tls12_get_sigid(pk);
3590 p[0] = (unsigned char)md_id;
3591 p[1] = (unsigned char)sig_id;
3595 int tls12_get_sigid(const EVP_PKEY *pk)
3597 return tls12_find_id(pk->type, tls12_sig,
3598 sizeof(tls12_sig)/sizeof(tls12_lookup));
3601 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3605 #ifndef OPENSSL_NO_MD5
3606 case TLSEXT_hash_md5:
3613 #ifndef OPENSSL_NO_SHA
3614 case TLSEXT_hash_sha1:
3617 #ifndef OPENSSL_NO_SHA256
3618 case TLSEXT_hash_sha224:
3619 return EVP_sha224();
3621 case TLSEXT_hash_sha256:
3622 return EVP_sha256();
3624 #ifndef OPENSSL_NO_SHA512
3625 case TLSEXT_hash_sha384:
3626 return EVP_sha384();
3628 case TLSEXT_hash_sha512:
3629 return EVP_sha512();
3637 static int tls12_get_pkey_idx(unsigned char sig_alg)
3641 #ifndef OPENSSL_NO_RSA
3642 case TLSEXT_signature_rsa:
3643 return SSL_PKEY_RSA_SIGN;
3645 #ifndef OPENSSL_NO_DSA
3646 case TLSEXT_signature_dsa:
3647 return SSL_PKEY_DSA_SIGN;
3649 #ifndef OPENSSL_NO_ECDSA
3650 case TLSEXT_signature_ecdsa:
3651 return SSL_PKEY_ECC;
3657 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3658 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3659 int *psignhash_nid, const unsigned char *data)
3661 int sign_nid = 0, hash_nid = 0;
3662 if (!phash_nid && !psign_nid && !psignhash_nid)
3664 if (phash_nid || psignhash_nid)
3666 hash_nid = tls12_find_nid(data[0], tls12_md,
3667 sizeof(tls12_md)/sizeof(tls12_lookup));
3669 *phash_nid = hash_nid;
3671 if (psign_nid || psignhash_nid)
3673 sign_nid = tls12_find_nid(data[1], tls12_sig,
3674 sizeof(tls12_sig)/sizeof(tls12_lookup));
3676 *psign_nid = sign_nid;
3680 if (sign_nid && hash_nid)
3681 OBJ_find_sigid_by_algs(psignhash_nid,
3682 hash_nid, sign_nid);
3684 *psignhash_nid = NID_undef;
3687 /* Given preference and allowed sigalgs set shared sigalgs */
3688 static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
3689 const unsigned char *pref, size_t preflen,
3690 const unsigned char *allow, size_t allowlen)
3692 const unsigned char *ptmp, *atmp;
3693 size_t i, j, nmatch = 0;
3694 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3696 /* Skip disabled hashes or signature algorithms */
3697 if (tls12_get_hash(ptmp[0]) == NULL)
3699 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3701 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3703 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3708 shsig->rhash = ptmp[0];
3709 shsig->rsign = ptmp[1];
3710 tls1_lookup_sigalg(&shsig->hash_nid,
3712 &shsig->signandhash_nid,
3723 /* Set shared signature algorithms for SSL structures */
3724 static int tls1_set_shared_sigalgs(SSL *s)
3726 const unsigned char *pref, *allow, *conf;
3727 size_t preflen, allowlen, conflen;
3729 TLS_SIGALGS *salgs = NULL;
3731 unsigned int is_suiteb = tls1_suiteb(s);
3732 /* If client use client signature algorithms if not NULL */
3733 if (!s->server && c->client_sigalgs && !is_suiteb)
3735 conf = c->client_sigalgs;
3736 conflen = c->client_sigalgslen;
3738 else if (c->conf_sigalgs && !is_suiteb)
3740 conf = c->conf_sigalgs;
3741 conflen = c->conf_sigalgslen;
3744 conflen = tls12_get_psigalgs(s, &conf);
3745 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
3749 allow = c->peer_sigalgs;
3750 allowlen = c->peer_sigalgslen;
3756 pref = c->peer_sigalgs;
3757 preflen = c->peer_sigalgslen;
3759 nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
3762 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3765 nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
3766 c->shared_sigalgs = salgs;
3767 c->shared_sigalgslen = nmatch;
3772 /* Set preferred digest for each key type */
3774 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
3780 TLS_SIGALGS *sigptr;
3781 /* Extension ignored for inappropriate versions */
3782 if (!SSL_USE_SIGALGS(s))
3784 /* Should never happen */
3788 c->peer_sigalgs = OPENSSL_malloc(dsize);
3789 if (!c->peer_sigalgs)
3791 c->peer_sigalgslen = dsize;
3792 memcpy(c->peer_sigalgs, data, dsize);
3794 tls1_set_shared_sigalgs(s);
3796 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
3797 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
3799 /* Use first set signature preference to force message
3800 * digest, ignoring any peer preferences.
3802 const unsigned char *sigs = NULL;
3804 sigs = c->conf_sigalgs;
3806 sigs = c->client_sigalgs;
3809 idx = tls12_get_pkey_idx(sigs[1]);
3810 md = tls12_get_hash(sigs[0]);
3811 c->pkeys[idx].digest = md;
3812 c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3813 if (idx == SSL_PKEY_RSA_SIGN)
3815 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3816 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3822 for (i = 0, sigptr = c->shared_sigalgs;
3823 i < c->shared_sigalgslen; i++, sigptr++)
3825 idx = tls12_get_pkey_idx(sigptr->rsign);
3826 if (idx > 0 && c->pkeys[idx].digest == NULL)
3828 md = tls12_get_hash(sigptr->rhash);
3829 c->pkeys[idx].digest = md;
3830 c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3831 if (idx == SSL_PKEY_RSA_SIGN)
3833 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3834 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3839 /* In strict mode leave unset digests as NULL to indicate we can't
3840 * use the certificate for signing.
3842 if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
3844 /* Set any remaining keys to default values. NOTE: if alg is
3845 * not supported it stays as NULL.
3847 #ifndef OPENSSL_NO_DSA
3848 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3849 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
3851 #ifndef OPENSSL_NO_RSA
3852 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3854 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3855 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3858 #ifndef OPENSSL_NO_ECDSA
3859 if (!c->pkeys[SSL_PKEY_ECC].digest)
3860 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
3867 int SSL_get_sigalgs(SSL *s, int idx,
3868 int *psign, int *phash, int *psignhash,
3869 unsigned char *rsig, unsigned char *rhash)
3871 const unsigned char *psig = s->cert->peer_sigalgs;
3877 if (idx >= (int)s->cert->peer_sigalgslen)
3884 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3886 return s->cert->peer_sigalgslen / 2;
3889 int SSL_get_shared_sigalgs(SSL *s, int idx,
3890 int *psign, int *phash, int *psignhash,
3891 unsigned char *rsig, unsigned char *rhash)
3893 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3894 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3898 *phash = shsigalgs->hash_nid;
3900 *psign = shsigalgs->sign_nid;
3902 *psignhash = shsigalgs->signandhash_nid;
3904 *rsig = shsigalgs->rsign;
3906 *rhash = shsigalgs->rhash;
3907 return s->cert->shared_sigalgslen;
3911 #ifndef OPENSSL_NO_HEARTBEATS
3913 tls1_process_heartbeat(SSL *s)
3915 unsigned char *p = &s->s3->rrec.data[0], *pl;
3916 unsigned short hbtype;
3917 unsigned int payload;
3918 unsigned int padding = 16; /* Use minimum padding */
3920 /* Read type and payload length first */
3925 if (s->msg_callback)
3926 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3927 &s->s3->rrec.data[0], s->s3->rrec.length,
3928 s, s->msg_callback_arg);
3930 if (hbtype == TLS1_HB_REQUEST)
3932 unsigned char *buffer, *bp;
3935 /* Allocate memory for the response, size is 1 bytes
3936 * message type, plus 2 bytes payload length, plus
3937 * payload, plus padding
3939 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3942 /* Enter response type, length and copy payload */
3943 *bp++ = TLS1_HB_RESPONSE;
3945 memcpy(bp, pl, payload);
3947 /* Random padding */
3948 RAND_pseudo_bytes(bp, padding);
3950 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3952 if (r >= 0 && s->msg_callback)
3953 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3954 buffer, 3 + payload + padding,
3955 s, s->msg_callback_arg);
3957 OPENSSL_free(buffer);
3962 else if (hbtype == TLS1_HB_RESPONSE)
3966 /* We only send sequence numbers (2 bytes unsigned int),
3967 * and 16 random bytes, so we just try to read the
3968 * sequence number */
3971 if (payload == 18 && seq == s->tlsext_hb_seq)
3974 s->tlsext_hb_pending = 0;
3982 tls1_heartbeat(SSL *s)
3984 unsigned char *buf, *p;
3986 unsigned int payload = 18; /* Sequence number + random bytes */
3987 unsigned int padding = 16; /* Use minimum padding */
3989 /* Only send if peer supports and accepts HB requests... */
3990 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3991 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3993 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3997 /* ...and there is none in flight yet... */
3998 if (s->tlsext_hb_pending)
4000 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
4004 /* ...and no handshake in progress. */
4005 if (SSL_in_init(s) || s->in_handshake)
4007 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
4011 /* Check if padding is too long, payload and padding
4012 * must not exceed 2^14 - 3 = 16381 bytes in total.
4014 OPENSSL_assert(payload + padding <= 16381);
4016 /* Create HeartBeat message, we just use a sequence number
4017 * as payload to distuingish different messages and add
4018 * some random stuff.
4019 * - Message Type, 1 byte
4020 * - Payload Length, 2 bytes (unsigned int)
4021 * - Payload, the sequence number (2 bytes uint)
4022 * - Payload, random bytes (16 bytes uint)
4025 buf = OPENSSL_malloc(1 + 2 + payload + padding);
4028 *p++ = TLS1_HB_REQUEST;
4029 /* Payload length (18 bytes here) */
4031 /* Sequence number */
4032 s2n(s->tlsext_hb_seq, p);
4033 /* 16 random bytes */
4034 RAND_pseudo_bytes(p, 16);
4036 /* Random padding */
4037 RAND_pseudo_bytes(p, padding);
4039 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
4042 if (s->msg_callback)
4043 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4044 buf, 3 + payload + padding,
4045 s, s->msg_callback_arg);
4047 s->tlsext_hb_pending = 1;
4056 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
4061 int sigalgs[MAX_SIGALGLEN];
4064 static int sig_cb(const char *elem, int len, void *arg)
4066 sig_cb_st *sarg = arg;
4069 int sig_alg, hash_alg;
4070 if (sarg->sigalgcnt == MAX_SIGALGLEN)
4072 if (len > (int)(sizeof(etmp) - 1))
4074 memcpy(etmp, elem, len);
4076 p = strchr(etmp, '+');
4084 if (!strcmp(etmp, "RSA"))
4085 sig_alg = EVP_PKEY_RSA;
4086 else if (!strcmp(etmp, "DSA"))
4087 sig_alg = EVP_PKEY_DSA;
4088 else if (!strcmp(etmp, "ECDSA"))
4089 sig_alg = EVP_PKEY_EC;
4092 hash_alg = OBJ_sn2nid(p);
4093 if (hash_alg == NID_undef)
4094 hash_alg = OBJ_ln2nid(p);
4095 if (hash_alg == NID_undef)
4098 for (i = 0; i < sarg->sigalgcnt; i+=2)
4100 if (sarg->sigalgs[i] == sig_alg
4101 && sarg->sigalgs[i + 1] == hash_alg)
4104 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
4105 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
4109 /* Set suppored signature algorithms based on a colon separated list
4110 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
4111 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
4115 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
4119 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
4122 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
4124 unsigned char *sigalgs, *sptr;
4129 sigalgs = OPENSSL_malloc(salglen);
4130 if (sigalgs == NULL)
4132 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
4134 rhash = tls12_find_id(*psig_nids++, tls12_md,
4135 sizeof(tls12_md)/sizeof(tls12_lookup));
4136 rsign = tls12_find_id(*psig_nids++, tls12_sig,
4137 sizeof(tls12_sig)/sizeof(tls12_lookup));
4139 if (rhash == -1 || rsign == -1)
4147 if (c->client_sigalgs)
4148 OPENSSL_free(c->client_sigalgs);
4149 c->client_sigalgs = sigalgs;
4150 c->client_sigalgslen = salglen;
4154 if (c->conf_sigalgs)
4155 OPENSSL_free(c->conf_sigalgs);
4156 c->conf_sigalgs = sigalgs;
4157 c->conf_sigalgslen = salglen;
4163 OPENSSL_free(sigalgs);
4167 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
4171 if (default_nid == -1)
4173 sig_nid = X509_get_signature_nid(x);
4175 return sig_nid == default_nid ? 1 : 0;
4176 for (i = 0; i < c->shared_sigalgslen; i++)
4177 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
4181 /* Check to see if a certificate issuer name matches list of CA names */
4182 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
4186 nm = X509_get_issuer_name(x);
4187 for (i = 0; i < sk_X509_NAME_num(names); i++)
4189 if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
4195 /* Check certificate chain is consistent with TLS extensions and is
4196 * usable by server. This servers two purposes: it allows users to
4197 * check chains before passing them to the server and it allows the
4198 * server to check chains before attempting to use them.
4201 /* Flags which need to be set for a certificate when stict mode not set */
4203 #define CERT_PKEY_VALID_FLAGS \
4204 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
4205 /* Strict mode flags */
4206 #define CERT_PKEY_STRICT_FLAGS \
4207 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
4208 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
4210 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
4215 int check_flags = 0, strict_mode;
4216 CERT_PKEY *cpk = NULL;
4218 unsigned int suiteb_flags = tls1_suiteb(s);
4219 /* idx == -1 means checking server chains */
4222 /* idx == -2 means checking client certificate chains */
4226 idx = cpk - c->pkeys;
4229 cpk = c->pkeys + idx;
4231 pk = cpk->privatekey;
4233 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
4234 /* If no cert or key, forget it */
4237 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
4238 /* Allow any certificate to pass test */
4239 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
4241 rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
4242 cpk->valid_flags = rv;
4251 idx = ssl_cert_type(x, pk);
4254 cpk = c->pkeys + idx;
4255 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
4256 check_flags = CERT_PKEY_STRICT_FLAGS;
4258 check_flags = CERT_PKEY_VALID_FLAGS;
4266 check_flags |= CERT_PKEY_SUITEB;
4267 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
4268 if (ok != X509_V_OK)
4271 rv |= CERT_PKEY_SUITEB;
4277 /* Check all signature algorithms are consistent with
4278 * signature algorithms extension if TLS 1.2 or later
4281 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
4284 unsigned char rsign = 0;
4285 if (c->peer_sigalgs)
4287 /* If no sigalgs extension use defaults from RFC5246 */
4292 case SSL_PKEY_RSA_ENC:
4293 case SSL_PKEY_RSA_SIGN:
4294 case SSL_PKEY_DH_RSA:
4295 rsign = TLSEXT_signature_rsa;
4296 default_nid = NID_sha1WithRSAEncryption;
4299 case SSL_PKEY_DSA_SIGN:
4300 case SSL_PKEY_DH_DSA:
4301 rsign = TLSEXT_signature_dsa;
4302 default_nid = NID_dsaWithSHA1;
4306 rsign = TLSEXT_signature_ecdsa;
4307 default_nid = NID_ecdsa_with_SHA1;
4315 /* If peer sent no signature algorithms extension and we
4316 * have set preferred signature algorithms check we support
4319 if (default_nid > 0 && c->conf_sigalgs)
4322 const unsigned char *p = c->conf_sigalgs;
4323 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
4325 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4328 if (j == c->conf_sigalgslen)
4336 /* Check signature algorithm of each cert in chain */
4337 if (!tls1_check_sig_alg(c, x, default_nid))
4339 if (!check_flags) goto end;
4342 rv |= CERT_PKEY_EE_SIGNATURE;
4343 rv |= CERT_PKEY_CA_SIGNATURE;
4344 for (i = 0; i < sk_X509_num(chain); i++)
4346 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
4351 rv &= ~CERT_PKEY_CA_SIGNATURE;
4359 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4360 else if(check_flags)
4361 rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
4363 /* Check cert parameters are consistent */
4364 if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
4365 rv |= CERT_PKEY_EE_PARAM;
4366 else if (!check_flags)
4369 rv |= CERT_PKEY_CA_PARAM;
4370 /* In strict mode check rest of chain too */
4371 else if (strict_mode)
4373 rv |= CERT_PKEY_CA_PARAM;
4374 for (i = 0; i < sk_X509_num(chain); i++)
4376 X509 *ca = sk_X509_value(chain, i);
4377 if (!tls1_check_cert_param(s, ca, 0))
4381 rv &= ~CERT_PKEY_CA_PARAM;
4389 if (!s->server && strict_mode)
4391 STACK_OF(X509_NAME) *ca_dn;
4396 check_type = TLS_CT_RSA_SIGN;
4399 check_type = TLS_CT_DSS_SIGN;
4402 check_type = TLS_CT_ECDSA_SIGN;
4407 int cert_type = X509_certificate_type(x, pk);
4408 if (cert_type & EVP_PKS_RSA)
4409 check_type = TLS_CT_RSA_FIXED_DH;
4410 if (cert_type & EVP_PKS_DSA)
4411 check_type = TLS_CT_DSS_FIXED_DH;
4416 const unsigned char *ctypes;
4421 ctypelen = (int)c->ctype_num;
4425 ctypes = (unsigned char *)s->s3->tmp.ctype;
4426 ctypelen = s->s3->tmp.ctype_num;
4428 for (i = 0; i < ctypelen; i++)
4430 if (ctypes[i] == check_type)
4432 rv |= CERT_PKEY_CERT_TYPE;
4436 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
4440 rv |= CERT_PKEY_CERT_TYPE;
4443 ca_dn = s->s3->tmp.ca_names;
4445 if (!sk_X509_NAME_num(ca_dn))
4446 rv |= CERT_PKEY_ISSUER_NAME;
4448 if (!(rv & CERT_PKEY_ISSUER_NAME))
4450 if (ssl_check_ca_name(ca_dn, x))
4451 rv |= CERT_PKEY_ISSUER_NAME;
4453 if (!(rv & CERT_PKEY_ISSUER_NAME))
4455 for (i = 0; i < sk_X509_num(chain); i++)
4457 X509 *xtmp = sk_X509_value(chain, i);
4458 if (ssl_check_ca_name(ca_dn, xtmp))
4460 rv |= CERT_PKEY_ISSUER_NAME;
4465 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4469 rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
4471 if (!check_flags || (rv & check_flags) == check_flags)
4472 rv |= CERT_PKEY_VALID;
4476 if (TLS1_get_version(s) >= TLS1_2_VERSION)
4478 if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
4479 rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
4480 else if (cpk->digest)
4481 rv |= CERT_PKEY_SIGN;
4484 rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
4486 /* When checking a CERT_PKEY structure all flags are irrelevant
4487 * if the chain is invalid.
4491 if (rv & CERT_PKEY_VALID)
4492 cpk->valid_flags = rv;
4495 /* Preserve explicit sign flag, clear rest */
4496 cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
4503 /* Set validity of certificates in an SSL structure */
4504 void tls1_set_cert_validity(SSL *s)
4506 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4507 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4508 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4509 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
4510 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
4511 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4513 /* User level utiity function to check a chain is suitable */
4514 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4516 return tls1_check_chain(s, x, pk, chain, -1);