2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/objects.h>
13 #include <openssl/evp.h>
14 #include <openssl/hmac.h>
15 #include <openssl/ocsp.h>
16 #include <openssl/conf.h>
17 #include <openssl/x509v3.h>
18 #include <openssl/dh.h>
19 #include <openssl/bn.h>
21 #include <openssl/ct.h>
23 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, size_t ticklen,
24 const unsigned char *sess_id, size_t sesslen,
26 static int ssl_check_clienthello_tlsext_early(SSL *s);
27 static int ssl_check_serverhello_tlsext(SSL *s);
29 SSL3_ENC_METHOD const TLSv1_enc_data = {
33 tls1_generate_master_secret,
34 tls1_change_cipher_state,
35 tls1_final_finish_mac,
36 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
37 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
39 tls1_export_keying_material,
41 ssl3_set_handshake_header,
42 tls_close_construct_packet,
46 SSL3_ENC_METHOD const TLSv1_1_enc_data = {
50 tls1_generate_master_secret,
51 tls1_change_cipher_state,
52 tls1_final_finish_mac,
53 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
54 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
56 tls1_export_keying_material,
57 SSL_ENC_FLAG_EXPLICIT_IV,
58 ssl3_set_handshake_header,
59 tls_close_construct_packet,
63 SSL3_ENC_METHOD const TLSv1_2_enc_data = {
67 tls1_generate_master_secret,
68 tls1_change_cipher_state,
69 tls1_final_finish_mac,
70 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
71 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
73 tls1_export_keying_material,
74 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
75 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
76 ssl3_set_handshake_header,
77 tls_close_construct_packet,
81 SSL3_ENC_METHOD const TLSv1_3_enc_data = {
85 tls1_generate_master_secret,
86 tls1_change_cipher_state,
87 tls1_final_finish_mac,
88 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
89 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
91 tls1_export_keying_material,
92 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
93 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
94 ssl3_set_handshake_header,
95 tls_close_construct_packet,
99 long tls1_default_timeout(void)
102 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
103 * http, the cache would over fill
105 return (60 * 60 * 2);
112 s->method->ssl_clear(s);
116 void tls1_free(SSL *s)
118 OPENSSL_free(s->tlsext_session_ticket);
122 void tls1_clear(SSL *s)
125 if (s->method->version == TLS_ANY_VERSION)
126 s->version = TLS_MAX_VERSION;
128 s->version = s->method->version;
131 #ifndef OPENSSL_NO_EC
134 int nid; /* Curve NID */
135 int secbits; /* Bits of security (from SP800-57) */
136 unsigned int flags; /* Flags: currently just field type */
140 * Table of curve information.
141 * Do not delete entries or reorder this array! It is used as a lookup
142 * table: the index of each entry is one less than the TLS curve id.
144 static const tls_curve_info nid_list[] = {
145 {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
146 {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
147 {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
148 {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
149 {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
150 {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
151 {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
152 {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
153 {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
154 {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
155 {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
156 {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
157 {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
158 {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
159 {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
160 {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
161 {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
162 {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
163 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
164 {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
165 {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
166 {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
167 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
168 {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
169 {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
170 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
171 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
172 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
173 {NID_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
176 static const unsigned char ecformats_default[] = {
177 TLSEXT_ECPOINTFORMAT_uncompressed,
178 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
179 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
182 /* The default curves */
183 static const unsigned char eccurves_default[] = {
184 0, 29, /* X25519 (29) */
185 0, 23, /* secp256r1 (23) */
186 0, 25, /* secp521r1 (25) */
187 0, 24, /* secp384r1 (24) */
190 static const unsigned char eccurves_all[] = {
191 0, 29, /* X25519 (29) */
192 0, 23, /* secp256r1 (23) */
193 0, 25, /* secp521r1 (25) */
194 0, 24, /* secp384r1 (24) */
195 0, 26, /* brainpoolP256r1 (26) */
196 0, 27, /* brainpoolP384r1 (27) */
197 0, 28, /* brainpool512r1 (28) */
200 * Remaining curves disabled by default but still permitted if set
201 * via an explicit callback or parameters.
203 0, 22, /* secp256k1 (22) */
204 0, 14, /* sect571r1 (14) */
205 0, 13, /* sect571k1 (13) */
206 0, 11, /* sect409k1 (11) */
207 0, 12, /* sect409r1 (12) */
208 0, 9, /* sect283k1 (9) */
209 0, 10, /* sect283r1 (10) */
210 0, 20, /* secp224k1 (20) */
211 0, 21, /* secp224r1 (21) */
212 0, 18, /* secp192k1 (18) */
213 0, 19, /* secp192r1 (19) */
214 0, 15, /* secp160k1 (15) */
215 0, 16, /* secp160r1 (16) */
216 0, 17, /* secp160r2 (17) */
217 0, 8, /* sect239k1 (8) */
218 0, 6, /* sect233k1 (6) */
219 0, 7, /* sect233r1 (7) */
220 0, 4, /* sect193r1 (4) */
221 0, 5, /* sect193r2 (5) */
222 0, 1, /* sect163k1 (1) */
223 0, 2, /* sect163r1 (2) */
224 0, 3, /* sect163r2 (3) */
227 static const unsigned char suiteb_curves[] = {
228 0, TLSEXT_curve_P_256,
229 0, TLSEXT_curve_P_384
232 int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags)
234 const tls_curve_info *cinfo;
235 /* ECC curves from RFC 4492 and RFC 7027 */
236 if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list)))
238 cinfo = nid_list + curve_id - 1;
240 *pflags = cinfo->flags;
244 int tls1_ec_nid2curve_id(int nid)
247 for (i = 0; i < OSSL_NELEM(nid_list); i++) {
248 if (nid_list[i].nid == nid)
255 * Get curves list, if "sess" is set return client curves otherwise
257 * Sets |num_curves| to the number of curves in the list, i.e.,
258 * the length of |pcurves| is 2 * num_curves.
259 * Returns 1 on success and 0 if the client curves list has invalid format.
260 * The latter indicates an internal error: we should not be accepting such
261 * lists in the first place.
262 * TODO(emilia): we should really be storing the curves list in explicitly
263 * parsed form instead. (However, this would affect binary compatibility
264 * so cannot happen in the 1.0.x series.)
266 static int tls1_get_curvelist(SSL *s, int sess,
267 const unsigned char **pcurves, size_t *num_curves)
269 size_t pcurveslen = 0;
271 *pcurves = s->session->tlsext_supportedgroupslist;
272 pcurveslen = s->session->tlsext_supportedgroupslist_length;
274 /* For Suite B mode only include P-256, P-384 */
275 switch (tls1_suiteb(s)) {
276 case SSL_CERT_FLAG_SUITEB_128_LOS:
277 *pcurves = suiteb_curves;
278 pcurveslen = sizeof(suiteb_curves);
281 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
282 *pcurves = suiteb_curves;
286 case SSL_CERT_FLAG_SUITEB_192_LOS:
287 *pcurves = suiteb_curves + 2;
291 *pcurves = s->tlsext_supportedgroupslist;
292 pcurveslen = s->tlsext_supportedgroupslist_length;
295 *pcurves = eccurves_default;
296 pcurveslen = sizeof(eccurves_default);
300 /* We do not allow odd length arrays to enter the system. */
301 if (pcurveslen & 1) {
302 SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
306 *num_curves = pcurveslen / 2;
311 /* See if curve is allowed by security callback */
312 static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
314 const tls_curve_info *cinfo;
317 if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list)))
319 cinfo = &nid_list[curve[1] - 1];
320 # ifdef OPENSSL_NO_EC2M
321 if (cinfo->flags & TLS_CURVE_CHAR2)
324 return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
327 /* Check a curve is one of our preferences */
328 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
330 const unsigned char *curves;
331 size_t num_curves, i;
332 unsigned int suiteb_flags = tls1_suiteb(s);
333 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
335 /* Check curve matches Suite B preferences */
337 unsigned long cid = s->s3->tmp.new_cipher->id;
340 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
341 if (p[2] != TLSEXT_curve_P_256)
343 } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
344 if (p[2] != TLSEXT_curve_P_384)
346 } else /* Should never happen */
349 if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
351 for (i = 0; i < num_curves; i++, curves += 2) {
352 if (p[1] == curves[0] && p[2] == curves[1])
353 return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
359 * For nmatch >= 0, return the NID of the |nmatch|th shared group or NID_undef
360 * if there is no match.
361 * For nmatch == -1, return number of matches
362 * For nmatch == -2, return the NID of the group to use for
363 * an EC tmp key, or NID_undef if there is no match.
365 int tls1_shared_group(SSL *s, int nmatch)
367 const unsigned char *pref, *supp;
368 size_t num_pref, num_supp, i, j;
370 /* Can't do anything on client side */
374 if (tls1_suiteb(s)) {
376 * For Suite B ciphersuite determines curve: we already know
377 * these are acceptable due to previous checks.
379 unsigned long cid = s->s3->tmp.new_cipher->id;
380 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
381 return NID_X9_62_prime256v1; /* P-256 */
382 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
383 return NID_secp384r1; /* P-384 */
384 /* Should never happen */
387 /* If not Suite B just return first preference shared curve */
391 * Avoid truncation. tls1_get_curvelist takes an int
392 * but s->options is a long...
394 if (!tls1_get_curvelist
395 (s, (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0, &supp,
397 /* In practice, NID_undef == 0 but let's be precise. */
398 return nmatch == -1 ? 0 : NID_undef;
399 if (!tls1_get_curvelist
400 (s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), &pref, &num_pref))
401 return nmatch == -1 ? 0 : NID_undef;
404 * If the client didn't send the elliptic_curves extension all of them
407 if (num_supp == 0 && (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0) {
409 num_supp = sizeof(eccurves_all) / 2;
410 } else if (num_pref == 0 &&
411 (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0) {
413 num_pref = sizeof(eccurves_all) / 2;
417 for (i = 0; i < num_pref; i++, pref += 2) {
418 const unsigned char *tsupp = supp;
419 for (j = 0; j < num_supp; j++, tsupp += 2) {
420 if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) {
421 if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
424 int id = (pref[0] << 8) | pref[1];
425 return tls1_ec_curve_id2nid(id, NULL);
433 /* Out of range (nmatch > k). */
437 int tls1_set_groups(unsigned char **pext, size_t *pextlen,
438 int *groups, size_t ngroups)
440 unsigned char *glist, *p;
443 * Bitmap of groups included to detect duplicates: only works while group
446 unsigned long dup_list = 0;
447 glist = OPENSSL_malloc(ngroups * 2);
450 for (i = 0, p = glist; i < ngroups; i++) {
451 unsigned long idmask;
453 /* TODO(TLS1.3): Convert for DH groups */
454 id = tls1_ec_nid2curve_id(groups[i]);
456 if (!id || (dup_list & idmask)) {
465 *pextlen = ngroups * 2;
469 # define MAX_CURVELIST 28
473 int nid_arr[MAX_CURVELIST];
476 static int nid_cb(const char *elem, int len, void *arg)
478 nid_cb_st *narg = arg;
484 if (narg->nidcnt == MAX_CURVELIST)
486 if (len > (int)(sizeof(etmp) - 1))
488 memcpy(etmp, elem, len);
490 nid = EC_curve_nist2nid(etmp);
491 if (nid == NID_undef)
492 nid = OBJ_sn2nid(etmp);
493 if (nid == NID_undef)
494 nid = OBJ_ln2nid(etmp);
495 if (nid == NID_undef)
497 for (i = 0; i < narg->nidcnt; i++)
498 if (narg->nid_arr[i] == nid)
500 narg->nid_arr[narg->nidcnt++] = nid;
504 /* Set groups based on a colon separate list */
505 int tls1_set_groups_list(unsigned char **pext, size_t *pextlen, const char *str)
509 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
513 return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
516 /* For an EC key set TLS id and required compression based on parameters */
517 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
524 /* Determine if it is a prime field */
525 grp = EC_KEY_get0_group(ec);
528 /* Determine curve ID */
529 id = EC_GROUP_get_curve_name(grp);
530 id = tls1_ec_nid2curve_id(id);
531 /* If no id return error: we don't support arbitrary explicit curves */
535 curve_id[1] = (unsigned char)id;
537 if (EC_KEY_get0_public_key(ec) == NULL)
539 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
540 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
542 if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)
543 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
545 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
551 /* Check an EC key is compatible with extensions */
552 static int tls1_check_ec_key(SSL *s,
553 unsigned char *curve_id, unsigned char *comp_id)
555 const unsigned char *pformats, *pcurves;
556 size_t num_formats, num_curves, i;
559 * If point formats extension present check it, otherwise everything is
560 * supported (see RFC4492).
562 if (comp_id && s->session->tlsext_ecpointformatlist) {
563 pformats = s->session->tlsext_ecpointformatlist;
564 num_formats = s->session->tlsext_ecpointformatlist_length;
565 for (i = 0; i < num_formats; i++, pformats++) {
566 if (*comp_id == *pformats)
569 if (i == num_formats)
574 /* Check curve is consistent with client and server preferences */
575 for (j = 0; j <= 1; j++) {
576 if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
578 if (j == 1 && num_curves == 0) {
580 * If we've not received any curves then skip this check.
581 * RFC 4492 does not require the supported elliptic curves extension
582 * so if it is not sent we can just choose any curve.
583 * It is invalid to send an empty list in the elliptic curves
584 * extension, so num_curves == 0 always means no extension.
588 for (i = 0; i < num_curves; i++, pcurves += 2) {
589 if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1])
594 /* For clients can only check sent curve list */
601 static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
605 * If we have a custom point format list use it otherwise use default
607 if (s->tlsext_ecpointformatlist) {
608 *pformats = s->tlsext_ecpointformatlist;
609 *num_formats = s->tlsext_ecpointformatlist_length;
611 *pformats = ecformats_default;
612 /* For Suite B we don't support char2 fields */
614 *num_formats = sizeof(ecformats_default) - 1;
616 *num_formats = sizeof(ecformats_default);
621 * Check cert parameters compatible with extensions: currently just checks EC
622 * certificates have compatible curves and compression.
624 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
626 unsigned char comp_id, curve_id[2];
629 pkey = X509_get0_pubkey(x);
632 /* If not EC nothing to do */
633 if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
635 rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey));
639 * Can't check curve_id for client certs as we don't have a supported
642 rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
646 * Special case for suite B. We *MUST* sign using SHA256+P-256 or
647 * SHA384+P-384, adjust digest if necessary.
649 if (set_ee_md && tls1_suiteb(s)) {
655 /* Check to see we have necessary signing algorithm */
656 if (curve_id[1] == TLSEXT_curve_P_256)
657 check_md = NID_ecdsa_with_SHA256;
658 else if (curve_id[1] == TLSEXT_curve_P_384)
659 check_md = NID_ecdsa_with_SHA384;
661 return 0; /* Should never happen */
662 for (i = 0; i < c->shared_sigalgslen; i++)
663 if (check_md == c->shared_sigalgs[i].signandhash_nid)
665 if (i == c->shared_sigalgslen)
667 if (set_ee_md == 2) {
668 if (check_md == NID_ecdsa_with_SHA256)
669 s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha256();
671 s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha384();
677 # ifndef OPENSSL_NO_EC
679 * tls1_check_ec_tmp_key - Check EC temporary key compatibility
681 * @cid: Cipher ID we're considering using
683 * Checks that the kECDHE cipher suite we're considering using
684 * is compatible with the client extensions.
686 * Returns 0 when the cipher can't be used or 1 when it can.
688 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
691 * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
694 if (tls1_suiteb(s)) {
695 unsigned char curve_id[2];
696 /* Curve to check determined by ciphersuite */
697 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
698 curve_id[1] = TLSEXT_curve_P_256;
699 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
700 curve_id[1] = TLSEXT_curve_P_384;
704 /* Check this curve is acceptable */
705 if (!tls1_check_ec_key(s, curve_id, NULL))
709 /* Need a shared curve */
710 if (tls1_shared_group(s, 0))
714 # endif /* OPENSSL_NO_EC */
718 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
723 #endif /* OPENSSL_NO_EC */
726 * List of supported signature algorithms and hashes. Should make this
727 * customisable at some point, for now include everything we support.
730 #ifdef OPENSSL_NO_RSA
731 # define tlsext_sigalg_rsa(md) /* */
733 # define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
736 #ifdef OPENSSL_NO_DSA
737 # define tlsext_sigalg_dsa(md) /* */
739 # define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
743 # define tlsext_sigalg_ecdsa(md)/* */
745 # define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
748 #define tlsext_sigalg(md) \
749 tlsext_sigalg_rsa(md) \
750 tlsext_sigalg_dsa(md) \
751 tlsext_sigalg_ecdsa(md)
753 static const unsigned char tls12_sigalgs[] = {
754 tlsext_sigalg(TLSEXT_hash_sha512)
755 tlsext_sigalg(TLSEXT_hash_sha384)
756 tlsext_sigalg(TLSEXT_hash_sha256)
757 tlsext_sigalg(TLSEXT_hash_sha224)
758 tlsext_sigalg(TLSEXT_hash_sha1)
759 #ifndef OPENSSL_NO_GOST
760 TLSEXT_hash_gostr3411, TLSEXT_signature_gostr34102001,
761 TLSEXT_hash_gostr34112012_256, TLSEXT_signature_gostr34102012_256,
762 TLSEXT_hash_gostr34112012_512, TLSEXT_signature_gostr34102012_512
766 #ifndef OPENSSL_NO_EC
767 static const unsigned char suiteb_sigalgs[] = {
768 tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
769 tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
772 size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
775 * If Suite B mode use Suite B sigalgs only, ignore any other
778 #ifndef OPENSSL_NO_EC
779 switch (tls1_suiteb(s)) {
780 case SSL_CERT_FLAG_SUITEB_128_LOS:
781 *psigs = suiteb_sigalgs;
782 return sizeof(suiteb_sigalgs);
784 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
785 *psigs = suiteb_sigalgs;
788 case SSL_CERT_FLAG_SUITEB_192_LOS:
789 *psigs = suiteb_sigalgs + 2;
793 /* If server use client authentication sigalgs if not NULL */
794 if (s->server && s->cert->client_sigalgs) {
795 *psigs = s->cert->client_sigalgs;
796 return s->cert->client_sigalgslen;
797 } else if (s->cert->conf_sigalgs) {
798 *psigs = s->cert->conf_sigalgs;
799 return s->cert->conf_sigalgslen;
801 *psigs = tls12_sigalgs;
802 return sizeof(tls12_sigalgs);
807 * Check signature algorithm is consistent with sent supported signature
808 * algorithms and if so return relevant digest.
810 int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
811 const unsigned char *sig, EVP_PKEY *pkey)
813 const unsigned char *sent_sigs;
814 size_t sent_sigslen, i;
815 int sigalg = tls12_get_sigid(pkey);
816 /* Should never happen */
819 /* Check key type is consistent with signature */
820 if (sigalg != (int)sig[1]) {
821 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
824 #ifndef OPENSSL_NO_EC
825 if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) {
826 unsigned char curve_id[2], comp_id;
827 /* Check compression and curve matches extensions */
828 if (!tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey)))
830 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) {
831 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
834 /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
835 if (tls1_suiteb(s)) {
838 if (curve_id[1] == TLSEXT_curve_P_256) {
839 if (sig[0] != TLSEXT_hash_sha256) {
840 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
841 SSL_R_ILLEGAL_SUITEB_DIGEST);
844 } else if (curve_id[1] == TLSEXT_curve_P_384) {
845 if (sig[0] != TLSEXT_hash_sha384) {
846 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
847 SSL_R_ILLEGAL_SUITEB_DIGEST);
853 } else if (tls1_suiteb(s))
857 /* Check signature matches a type we sent */
858 sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
859 for (i = 0; i < sent_sigslen; i += 2, sent_sigs += 2) {
860 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
863 /* Allow fallback to SHA1 if not strict mode */
864 if (i == sent_sigslen
865 && (sig[0] != TLSEXT_hash_sha1
866 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
867 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
870 *pmd = tls12_get_hash(sig[0]);
872 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST);
875 /* Make sure security callback allows algorithm */
876 if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
877 EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd), (void *)sig)) {
878 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
882 * Store the digest used so applications can retrieve it if they wish.
884 s->s3->tmp.peer_md = *pmd;
889 * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
890 * supported, doesn't appear in supported signature algorithms, isn't supported
891 * by the enabled protocol versions or by the security level.
893 * This function should only be used for checking which ciphers are supported
896 * Call ssl_cipher_disabled() to check that it's enabled or not.
898 void ssl_set_client_disabled(SSL *s)
900 s->s3->tmp.mask_a = 0;
901 s->s3->tmp.mask_k = 0;
902 ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
903 ssl_get_client_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver);
904 #ifndef OPENSSL_NO_PSK
905 /* with PSK there must be client callback set */
906 if (!s->psk_client_callback) {
907 s->s3->tmp.mask_a |= SSL_aPSK;
908 s->s3->tmp.mask_k |= SSL_PSK;
910 #endif /* OPENSSL_NO_PSK */
911 #ifndef OPENSSL_NO_SRP
912 if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
913 s->s3->tmp.mask_a |= SSL_aSRP;
914 s->s3->tmp.mask_k |= SSL_kSRP;
920 * ssl_cipher_disabled - check that a cipher is disabled or not
921 * @s: SSL connection that you want to use the cipher on
922 * @c: cipher to check
923 * @op: Security check that you want to do
925 * Returns 1 when it's disabled, 0 when enabled.
927 int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op)
929 if (c->algorithm_mkey & s->s3->tmp.mask_k
930 || c->algorithm_auth & s->s3->tmp.mask_a)
932 if (s->s3->tmp.max_ver == 0)
934 if (!SSL_IS_DTLS(s) && ((c->min_tls > s->s3->tmp.max_ver)
935 || (c->max_tls < s->s3->tmp.min_ver)))
937 if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
938 || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
941 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
944 static int tls_use_ticket(SSL *s)
946 if (s->options & SSL_OP_NO_TICKET)
948 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
951 static int compare_uint(const void *p1, const void *p2)
953 unsigned int u1 = *((const unsigned int *)p1);
954 unsigned int u2 = *((const unsigned int *)p2);
964 * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
965 * more than one extension of the same type in a ClientHello or ServerHello.
966 * This function does an initial scan over the extensions block to filter those
967 * out. It returns 1 if all extensions are unique, and 0 if the extensions
968 * contain duplicates, could not be successfully parsed, or an internal error
971 static int tls1_check_duplicate_extensions(const PACKET *packet)
973 PACKET extensions = *packet;
974 size_t num_extensions = 0, i = 0;
975 unsigned int *extension_types = NULL;
978 /* First pass: count the extensions. */
979 while (PACKET_remaining(&extensions) > 0) {
982 if (!PACKET_get_net_2(&extensions, &type) ||
983 !PACKET_get_length_prefixed_2(&extensions, &extension)) {
989 if (num_extensions <= 1)
992 extension_types = OPENSSL_malloc(sizeof(unsigned int) * num_extensions);
993 if (extension_types == NULL) {
994 SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_MALLOC_FAILURE);
998 /* Second pass: gather the extension types. */
999 extensions = *packet;
1000 for (i = 0; i < num_extensions; i++) {
1002 if (!PACKET_get_net_2(&extensions, &extension_types[i]) ||
1003 !PACKET_get_length_prefixed_2(&extensions, &extension)) {
1004 /* This should not happen. */
1005 SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
1010 if (PACKET_remaining(&extensions) != 0) {
1011 SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
1014 /* Sort the extensions and make sure there are no duplicates. */
1015 qsort(extension_types, num_extensions, sizeof(unsigned int), compare_uint);
1016 for (i = 1; i < num_extensions; i++) {
1017 if (extension_types[i - 1] == extension_types[i])
1022 OPENSSL_free(extension_types);
1026 int ssl_add_clienthello_tlsext(SSL *s, WPACKET *pkt, int *al)
1028 #ifndef OPENSSL_NO_EC
1029 const unsigned char *pcurves = NULL;
1030 size_t num_curves = 0;
1033 /* See if we support any ECC ciphersuites */
1034 if ((s->version >= TLS1_VERSION && s->version <= TLS1_2_VERSION)
1035 || SSL_IS_DTLS(s)) {
1037 unsigned long alg_k, alg_a;
1038 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1040 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) {
1041 const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1043 alg_k = c->algorithm_mkey;
1044 alg_a = c->algorithm_auth;
1045 if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
1046 || (alg_a & SSL_aECDSA)) {
1051 } else if (s->version >= TLS1_3_VERSION) {
1053 * TODO(TLS1.3): We always use ECC for TLSv1.3 at the moment. This will
1054 * change if we implement DH key shares
1059 if (s->version >= TLS1_3_VERSION) {
1060 /* Shouldn't happen! */
1061 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1066 /* Add RI if renegotiating */
1067 if (s->renegotiate) {
1068 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate)
1069 || !WPACKET_start_sub_packet_u16(pkt)
1070 || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished,
1071 s->s3->previous_client_finished_len)
1072 || !WPACKET_close(pkt)) {
1073 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1077 /* Only add RI for SSLv3 */
1078 if (s->client_version == SSL3_VERSION)
1081 if (s->tlsext_hostname != NULL) {
1082 /* Add TLS extension servername to the Client Hello message */
1083 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
1084 /* Sub-packet for server_name extension */
1085 || !WPACKET_start_sub_packet_u16(pkt)
1086 /* Sub-packet for servername list (always 1 hostname)*/
1087 || !WPACKET_start_sub_packet_u16(pkt)
1088 || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name)
1089 || !WPACKET_sub_memcpy_u16(pkt, s->tlsext_hostname,
1090 strlen(s->tlsext_hostname))
1091 || !WPACKET_close(pkt)
1092 || !WPACKET_close(pkt)) {
1093 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1097 #ifndef OPENSSL_NO_SRP
1098 /* Add SRP username if there is one */
1099 if (s->srp_ctx.login != NULL) {
1100 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp)
1101 /* Sub-packet for SRP extension */
1102 || !WPACKET_start_sub_packet_u16(pkt)
1103 || !WPACKET_start_sub_packet_u8(pkt)
1104 /* login must not be zero...internal error if so */
1105 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
1106 || !WPACKET_memcpy(pkt, s->srp_ctx.login,
1107 strlen(s->srp_ctx.login))
1108 || !WPACKET_close(pkt)
1109 || !WPACKET_close(pkt)) {
1110 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1116 #ifndef OPENSSL_NO_EC
1119 * Add TLS extension ECPointFormats to the ClientHello message
1121 const unsigned char *pformats, *pcurvestmp;
1125 tls1_get_formatlist(s, &pformats, &num_formats);
1127 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
1128 /* Sub-packet for formats extension */
1129 || !WPACKET_start_sub_packet_u16(pkt)
1130 || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats)
1131 || !WPACKET_close(pkt)) {
1132 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1137 * Add TLS extension supported_groups to the ClientHello message
1139 /* TODO(TLS1.3): Add support for DHE groups */
1140 pcurves = s->tlsext_supportedgroupslist;
1141 if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
1142 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1145 pcurvestmp = pcurves;
1147 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
1148 /* Sub-packet for supported_groups extension */
1149 || !WPACKET_start_sub_packet_u16(pkt)
1150 || !WPACKET_start_sub_packet_u16(pkt)) {
1151 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1154 /* Copy curve ID if supported */
1155 for (i = 0; i < num_curves; i++, pcurvestmp += 2) {
1156 if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
1157 if (!WPACKET_put_bytes_u8(pkt, pcurvestmp[0])
1158 || !WPACKET_put_bytes_u8(pkt, pcurvestmp[1])) {
1159 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
1160 ERR_R_INTERNAL_ERROR);
1165 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
1166 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1170 #endif /* OPENSSL_NO_EC */
1172 if (tls_use_ticket(s)) {
1174 if (!s->new_session && s->session && s->session->tlsext_tick)
1175 ticklen = s->session->tlsext_ticklen;
1176 else if (s->session && s->tlsext_session_ticket &&
1177 s->tlsext_session_ticket->data) {
1178 ticklen = s->tlsext_session_ticket->length;
1179 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1180 if (s->session->tlsext_tick == NULL) {
1181 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1184 memcpy(s->session->tlsext_tick,
1185 s->tlsext_session_ticket->data, ticklen);
1186 s->session->tlsext_ticklen = ticklen;
1189 if (ticklen == 0 && s->tlsext_session_ticket &&
1190 s->tlsext_session_ticket->data == NULL)
1193 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
1194 || !WPACKET_sub_memcpy_u16(pkt, s->session->tlsext_tick,
1196 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1202 if (SSL_CLIENT_USE_SIGALGS(s)) {
1204 const unsigned char *salg;
1206 salglen = tls12_get_psigalgs(s, &salg);
1208 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
1209 /* Sub-packet for sig-algs extension */
1210 || !WPACKET_start_sub_packet_u16(pkt)
1211 /* Sub-packet for the actual list */
1212 || !WPACKET_start_sub_packet_u16(pkt)
1213 || !tls12_copy_sigalgs(s, pkt, salg, salglen)
1214 || !WPACKET_close(pkt)
1215 || !WPACKET_close(pkt)) {
1216 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1220 #ifndef OPENSSL_NO_OCSP
1221 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
1224 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
1225 /* Sub-packet for status request extension */
1226 || !WPACKET_start_sub_packet_u16(pkt)
1227 || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp)
1228 /* Sub-packet for the ids */
1229 || !WPACKET_start_sub_packet_u16(pkt)) {
1230 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1233 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
1234 unsigned char *idbytes;
1238 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1239 idlen = i2d_OCSP_RESPID(id, NULL);
1241 /* Sub-packet for an individual id */
1242 || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes)
1243 || i2d_OCSP_RESPID(id, &idbytes) != idlen) {
1244 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1248 if (!WPACKET_close(pkt)
1249 || !WPACKET_start_sub_packet_u16(pkt)) {
1250 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1253 if (s->tlsext_ocsp_exts) {
1254 unsigned char *extbytes;
1255 int extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1258 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1261 if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes)
1262 || i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &extbytes)
1264 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1268 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
1269 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1275 #ifndef OPENSSL_NO_NEXTPROTONEG
1276 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) {
1278 * The client advertises an empty extension to indicate its support
1279 * for Next Protocol Negotiation
1281 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
1282 || !WPACKET_put_bytes_u16(pkt, 0)) {
1283 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1290 * finish_md_len is non-zero during a renegotiation, so
1291 * this avoids sending ALPN during the renegotiation
1292 * (see longer comment below)
1294 if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len) {
1295 if (!WPACKET_put_bytes_u16(pkt,
1296 TLSEXT_TYPE_application_layer_protocol_negotiation)
1297 /* Sub-packet ALPN extension */
1298 || !WPACKET_start_sub_packet_u16(pkt)
1299 || !WPACKET_sub_memcpy_u16(pkt, s->alpn_client_proto_list,
1300 s->alpn_client_proto_list_len)
1301 || !WPACKET_close(pkt)) {
1302 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1305 s->s3->alpn_sent = 1;
1307 #ifndef OPENSSL_NO_SRTP
1308 if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) {
1309 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s);
1310 SRTP_PROTECTION_PROFILE *prof;
1313 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
1314 /* Sub-packet for SRTP extension */
1315 || !WPACKET_start_sub_packet_u16(pkt)
1316 /* Sub-packet for the protection profile list */
1317 || !WPACKET_start_sub_packet_u16(pkt)) {
1318 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1321 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt);
1322 for (i = 0; i < ct; i++) {
1323 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
1324 if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) {
1325 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1329 if (!WPACKET_close(pkt)
1330 /* Add an empty use_mki value */
1331 || !WPACKET_put_bytes_u8(pkt, 0)
1332 || !WPACKET_close(pkt)) {
1333 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1338 custom_ext_init(&s->cert->cli_ext);
1339 /* Add custom TLS Extensions to ClientHello */
1340 if (!custom_ext_add(s, 0, pkt, al)) {
1341 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1345 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)) {
1346 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
1347 || !WPACKET_put_bytes_u16(pkt, 0)) {
1348 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1353 #ifndef OPENSSL_NO_CT
1354 if (s->ct_validation_callback != NULL) {
1355 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp)
1356 || !WPACKET_put_bytes_u16(pkt, 0)) {
1357 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1363 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
1364 || !WPACKET_put_bytes_u16(pkt, 0)) {
1365 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1369 /* TLS1.3 specific extensions */
1370 if (SSL_IS_TLS13(s)) {
1371 int min_version, max_version, reason, currv;
1372 size_t i, sharessent = 0;
1374 /* TODO(TLS1.3): Should we add this extension for versions < TLS1.3? */
1375 /* supported_versions extension */
1376 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions)
1377 || !WPACKET_start_sub_packet_u16(pkt)
1378 || !WPACKET_start_sub_packet_u8(pkt)) {
1379 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1382 reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
1384 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, reason);
1388 * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
1389 * we should include versions <TLS1.2. For the moment we do. To be
1392 for (currv = max_version; currv >= min_version; currv--) {
1393 /* TODO(TLS1.3): Remove this first if clause prior to release!! */
1394 if (currv == TLS1_3_VERSION) {
1395 if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) {
1396 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
1397 ERR_R_INTERNAL_ERROR);
1400 } else if (!WPACKET_put_bytes_u16(pkt, currv)) {
1401 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1405 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
1406 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1411 /* key_share extension */
1412 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1413 /* Extension data sub-packet */
1414 || !WPACKET_start_sub_packet_u16(pkt)
1415 /* KeyShare list sub-packet */
1416 || !WPACKET_start_sub_packet_u16(pkt)) {
1417 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1422 * TODO(TLS1.3): Make the number of key_shares sent configurable. For
1423 * now, just send one
1425 for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
1426 if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
1427 unsigned char *encodedPoint = NULL;
1428 unsigned int curve_id = 0;
1429 EVP_PKEY *key_share_key = NULL;
1432 if (s->s3->tmp.pkey != NULL) {
1433 /* Shouldn't happen! */
1434 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
1435 ERR_R_INTERNAL_ERROR);
1439 /* Generate a key for this key_share */
1440 curve_id = (pcurves[0] << 8) | pcurves[1];
1441 key_share_key = ssl_generate_pkey_curve(curve_id);
1442 if (key_share_key == NULL) {
1443 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
1447 /* Encode the public key. */
1448 encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
1450 if (encodedlen == 0) {
1451 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EC_LIB);
1452 EVP_PKEY_free(key_share_key);
1456 /* Create KeyShareEntry */
1457 if (!WPACKET_put_bytes_u16(pkt, curve_id)
1458 || !WPACKET_sub_memcpy_u16(pkt, encodedPoint,
1460 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
1461 ERR_R_INTERNAL_ERROR);
1462 EVP_PKEY_free(key_share_key);
1463 OPENSSL_free(encodedPoint);
1468 * TODO(TLS1.3): When changing to send more than one key_share
1469 * we're going to need to be able to save more than one EVP_PKEY
1470 * For now we reuse the existing tmp.pkey
1472 s->s3->group_id = curve_id;
1473 s->s3->tmp.pkey = key_share_key;
1475 OPENSSL_free(encodedPoint);
1478 if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
1479 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1485 * Add padding to workaround bugs in F5 terminators. See
1486 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
1487 * code works out the length of all existing extensions it MUST always
1490 if (s->options & SSL_OP_TLSEXT_PADDING) {
1491 unsigned char *padbytes;
1494 if (!WPACKET_get_total_written(pkt, &hlen)) {
1495 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1499 if (hlen > 0xff && hlen < 0x200) {
1500 hlen = 0x200 - hlen;
1506 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding)
1507 || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) {
1508 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1511 memset(padbytes, 0, hlen);
1519 int ssl_add_serverhello_tlsext(SSL *s, WPACKET *pkt, int *al)
1521 #ifndef OPENSSL_NO_NEXTPROTONEG
1522 int next_proto_neg_seen;
1524 #ifndef OPENSSL_NO_EC
1525 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1526 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1527 int using_ecc = (alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA);
1528 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1531 if (!WPACKET_start_sub_packet_u16(pkt)
1532 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH)) {
1533 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1537 if (s->s3->send_connection_binding &&
1538 !ssl_add_serverhello_renegotiate_ext(s, pkt)) {
1539 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1543 /* Only add RI for SSLv3 */
1544 if (s->version == SSL3_VERSION)
1547 if (!s->hit && s->servername_done == 1
1548 && s->session->tlsext_hostname != NULL) {
1549 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name)
1550 || !WPACKET_put_bytes_u16(pkt, 0)) {
1551 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1555 #ifndef OPENSSL_NO_EC
1557 const unsigned char *plist;
1560 * Add TLS extension ECPointFormats to the ServerHello message
1562 tls1_get_formatlist(s, &plist, &plistlen);
1564 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats)
1565 || !WPACKET_start_sub_packet_u16(pkt)
1566 || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen)
1567 || !WPACKET_close(pkt)) {
1568 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1573 * Currently the server should not respond with a SupportedCurves
1576 #endif /* OPENSSL_NO_EC */
1578 if (s->tlsext_ticket_expected && tls_use_ticket(s)) {
1579 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket)
1580 || !WPACKET_put_bytes_u16(pkt, 0)) {
1581 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1586 * if we don't add the above TLSEXT, we can't add a session ticket
1589 s->tlsext_ticket_expected = 0;
1592 if (s->tlsext_status_expected) {
1593 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request)
1594 || !WPACKET_put_bytes_u16(pkt, 0)) {
1595 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1599 #ifndef OPENSSL_NO_SRTP
1600 if (SSL_IS_DTLS(s) && s->srtp_profile) {
1601 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp)
1602 || !WPACKET_start_sub_packet_u16(pkt)
1603 || !WPACKET_put_bytes_u16(pkt, 2)
1604 || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id)
1605 || !WPACKET_put_bytes_u8(pkt, 0)
1606 || !WPACKET_close(pkt)) {
1607 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1613 if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80
1614 || (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81)
1615 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) {
1616 const unsigned char cryptopro_ext[36] = {
1617 0xfd, 0xe8, /* 65000 */
1618 0x00, 0x20, /* 32 bytes length */
1619 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1620 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1621 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1622 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
1624 if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) {
1625 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1630 #ifndef OPENSSL_NO_NEXTPROTONEG
1631 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1632 s->s3->next_proto_neg_seen = 0;
1633 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) {
1634 const unsigned char *npa;
1635 unsigned int npalen;
1638 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen,
1640 ctx->next_protos_advertised_cb_arg);
1641 if (r == SSL_TLSEXT_ERR_OK) {
1642 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg)
1643 || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) {
1644 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1647 s->s3->next_proto_neg_seen = 1;
1652 if (s->version == TLS1_3_VERSION && !s->hit) {
1653 unsigned char *encodedPoint;
1654 size_t encoded_pt_len = 0;
1655 EVP_PKEY *ckey = NULL, *skey = NULL;
1657 ckey = s->s3->peer_tmp;
1659 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1663 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
1664 || !WPACKET_start_sub_packet_u16(pkt)
1665 || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
1666 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1670 skey = ssl_generate_pkey(ckey);
1672 /* Generate encoding of server key */
1673 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
1674 if (encoded_pt_len == 0) {
1675 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_EC_LIB);
1676 EVP_PKEY_free(skey);
1680 if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
1681 || !WPACKET_close(pkt)) {
1682 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1683 EVP_PKEY_free(skey);
1684 OPENSSL_free(encodedPoint);
1687 OPENSSL_free(encodedPoint);
1689 s->s3->tmp.pkey = skey;
1691 if (ssl_derive(s, skey, ckey, 1) == 0) {
1692 *al = SSL_AD_INTERNAL_ERROR;
1693 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1698 if (!custom_ext_add(s, 1, pkt, al)) {
1699 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1703 if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC) {
1705 * Don't use encrypt_then_mac if AEAD or RC4 might want to disable
1706 * for other cases too.
1708 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
1709 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4
1710 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT
1711 || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12)
1712 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1714 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac)
1715 || !WPACKET_put_bytes_u16(pkt, 0)) {
1716 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1721 if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) {
1722 if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret)
1723 || !WPACKET_put_bytes_u16(pkt, 0)) {
1724 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1729 if (s->s3->alpn_selected != NULL) {
1730 if (!WPACKET_put_bytes_u16(pkt,
1731 TLSEXT_TYPE_application_layer_protocol_negotiation)
1732 || !WPACKET_start_sub_packet_u16(pkt)
1733 || !WPACKET_start_sub_packet_u16(pkt)
1734 || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected,
1735 s->s3->alpn_selected_len)
1736 || !WPACKET_close(pkt)
1737 || !WPACKET_close(pkt)) {
1738 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1744 if (!WPACKET_close(pkt)) {
1745 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1752 * Save the ALPN extension in a ClientHello.
1753 * pkt: the contents of the ALPN extension, not including type and length.
1754 * al: a pointer to the alert value to send in the event of a failure.
1755 * returns: 1 on success, 0 on error.
1757 static int tls1_alpn_handle_client_hello(SSL *s, PACKET *pkt, int *al)
1759 PACKET protocol_list, save_protocol_list, protocol;
1761 *al = SSL_AD_DECODE_ERROR;
1763 if (!PACKET_as_length_prefixed_2(pkt, &protocol_list)
1764 || PACKET_remaining(&protocol_list) < 2) {
1768 save_protocol_list = protocol_list;
1770 /* Protocol names can't be empty. */
1771 if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol)
1772 || PACKET_remaining(&protocol) == 0) {
1775 } while (PACKET_remaining(&protocol_list) != 0);
1777 if (!PACKET_memdup(&save_protocol_list,
1778 &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) {
1779 *al = TLS1_AD_INTERNAL_ERROR;
1787 * Process the ALPN extension in a ClientHello.
1788 * al: a pointer to the alert value to send in the event of a failure.
1789 * returns 1 on success, 0 on error.
1791 static int tls1_alpn_handle_client_hello_late(SSL *s, int *al)
1793 const unsigned char *selected = NULL;
1794 unsigned char selected_len = 0;
1796 if (s->ctx->alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) {
1797 int r = s->ctx->alpn_select_cb(s, &selected, &selected_len,
1798 s->s3->alpn_proposed,
1799 (unsigned int)s->s3->alpn_proposed_len,
1800 s->ctx->alpn_select_cb_arg);
1802 if (r == SSL_TLSEXT_ERR_OK) {
1803 OPENSSL_free(s->s3->alpn_selected);
1804 s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len);
1805 if (s->s3->alpn_selected == NULL) {
1806 *al = SSL_AD_INTERNAL_ERROR;
1809 s->s3->alpn_selected_len = selected_len;
1810 #ifndef OPENSSL_NO_NEXTPROTONEG
1811 /* ALPN takes precedence over NPN. */
1812 s->s3->next_proto_neg_seen = 0;
1815 *al = SSL_AD_NO_APPLICATION_PROTOCOL;
1823 #ifndef OPENSSL_NO_EC
1825 * ssl_check_for_safari attempts to fingerprint Safari using OS X
1826 * SecureTransport using the TLS extension block in |hello|.
1827 * Safari, since 10.6, sends exactly these extensions, in this order:
1832 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1833 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1834 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1835 * 10.8..10.8.3 (which don't work).
1837 static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
1843 static const unsigned char kSafariExtensionsBlock[] = {
1844 0x00, 0x0a, /* elliptic_curves extension */
1845 0x00, 0x08, /* 8 bytes */
1846 0x00, 0x06, /* 6 bytes of curve ids */
1847 0x00, 0x17, /* P-256 */
1848 0x00, 0x18, /* P-384 */
1849 0x00, 0x19, /* P-521 */
1851 0x00, 0x0b, /* ec_point_formats */
1852 0x00, 0x02, /* 2 bytes */
1853 0x01, /* 1 point format */
1854 0x00, /* uncompressed */
1855 /* The following is only present in TLS 1.2 */
1856 0x00, 0x0d, /* signature_algorithms */
1857 0x00, 0x0c, /* 12 bytes */
1858 0x00, 0x0a, /* 10 bytes */
1859 0x05, 0x01, /* SHA-384/RSA */
1860 0x04, 0x01, /* SHA-256/RSA */
1861 0x02, 0x01, /* SHA-1/RSA */
1862 0x04, 0x03, /* SHA-256/ECDSA */
1863 0x02, 0x03, /* SHA-1/ECDSA */
1866 /* Length of the common prefix (first two extensions). */
1867 static const size_t kSafariCommonExtensionsLength = 18;
1869 tmppkt = hello->extensions;
1871 if (!PACKET_forward(&tmppkt, 2)
1872 || !PACKET_get_net_2(&tmppkt, &type)
1873 || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
1877 if (type != TLSEXT_TYPE_server_name)
1880 ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
1881 sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
1883 s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
1886 #endif /* !OPENSSL_NO_EC */
1890 * Process the supported_groups extension if present. Returns success if the
1891 * extension is absent, or if it has been successfully processed.
1897 static int tls_process_supported_groups(SSL *s, CLIENTHELLO_MSG *hello)
1899 #ifndef OPENSSL_NO_EC
1900 PACKET supported_groups_list;
1901 RAW_EXTENSION *suppgroups = tls_get_extension_by_type(hello->pre_proc_exts,
1902 hello->num_extensions,
1903 TLSEXT_TYPE_supported_groups);
1905 if (suppgroups == NULL)
1908 /* Each group is 2 bytes and we must have at least 1. */
1909 if (!PACKET_as_length_prefixed_2(&suppgroups->data,
1910 &supported_groups_list)
1911 || PACKET_remaining(&supported_groups_list) == 0
1912 || (PACKET_remaining(&supported_groups_list) % 2) != 0) {
1917 && !PACKET_memdup(&supported_groups_list,
1918 &s->session->tlsext_supportedgroupslist,
1919 &s->session->tlsext_supportedgroupslist_length)) {
1927 * Checks a list of |groups| to determine if the |group_id| is in it. If it is
1928 * and |checkallow| is 1 then additionally check if the group is allowed to be
1932 * 1 if the group is in the list (and allowed if |checkallow| is 1)
1935 static int check_in_list(SSL *s, unsigned int group_id,
1936 const unsigned char *groups, size_t num_groups,
1941 if (groups == NULL || num_groups == 0)
1944 for (i = 0; i < num_groups; i++, groups += 2) {
1945 unsigned int share_id = (groups[0] << 8) | (groups[1]);
1946 if (group_id == share_id
1947 && (!checkallow || tls_curve_allowed(s, groups,
1948 SSL_SECOP_CURVE_CHECK))) {
1953 if (i == num_groups) {
1962 * Loop through all remaining ClientHello extensions that we collected earlier
1963 * and haven't already processed. For each one parse it and update the SSL
1964 * object as required.
1966 * Behaviour upon resumption is extension-specific. If the extension has no
1967 * effect during resumption, it is parsed (to verify its format) but otherwise
1970 * Returns 1 on success and 0 on failure.
1971 * Upon failure, sets |al| to the appropriate alert.
1973 static int ssl_scan_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello, int *al)
1976 int renegotiate_seen = 0;
1978 *al = SSL_AD_DECODE_ERROR;
1979 s->servername_done = 0;
1980 s->tlsext_status_type = -1;
1981 #ifndef OPENSSL_NO_NEXTPROTONEG
1982 s->s3->next_proto_neg_seen = 0;
1985 OPENSSL_free(s->s3->alpn_selected);
1986 s->s3->alpn_selected = NULL;
1987 s->s3->alpn_selected_len = 0;
1988 OPENSSL_free(s->s3->alpn_proposed);
1989 s->s3->alpn_proposed = NULL;
1990 s->s3->alpn_proposed_len = 0;
1992 #ifndef OPENSSL_NO_EC
1993 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1994 ssl_check_for_safari(s, hello);
1995 #endif /* !OPENSSL_NO_EC */
1997 /* Clear any signature algorithms extension received */
1998 OPENSSL_free(s->s3->tmp.peer_sigalgs);
1999 s->s3->tmp.peer_sigalgs = NULL;
2000 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2002 #ifndef OPENSSL_NO_SRP
2003 OPENSSL_free(s->srp_ctx.login);
2004 s->srp_ctx.login = NULL;
2007 s->srtp_profile = NULL;
2010 * We process the supported_groups extension first so that is done before
2011 * we get to key_share which needs to use the information in it.
2013 if (!tls_process_supported_groups(s, hello)) {
2014 *al = TLS1_AD_INTERNAL_ERROR;
2019 * We parse all extensions to ensure the ClientHello is well-formed but,
2020 * unless an extension specifies otherwise, we ignore extensions upon
2023 for (loop = 0; loop < hello->num_extensions; loop++) {
2024 RAW_EXTENSION *currext = &hello->pre_proc_exts[loop];
2026 if (s->tlsext_debug_cb)
2027 s->tlsext_debug_cb(s, 0, currext->type,
2028 PACKET_data(&currext->data),
2029 PACKET_remaining(&currext->data),
2030 s->tlsext_debug_arg);
2032 if (currext->type == TLSEXT_TYPE_renegotiate) {
2033 if (!ssl_parse_clienthello_renegotiate_ext(s,
2034 &currext->data, al))
2036 renegotiate_seen = 1;
2037 } else if (s->version == SSL3_VERSION) {
2040 * The servername extension is treated as follows:
2042 * - Only the hostname type is supported with a maximum length of 255.
2043 * - The servername is rejected if too long or if it contains zeros,
2044 * in which case an fatal alert is generated.
2045 * - The servername field is maintained together with the session cache.
2046 * - When a session is resumed, the servername call back invoked in order
2047 * to allow the application to position itself to the right context.
2048 * - The servername is acknowledged if it is new for a session or when
2049 * it is identical to a previously used for the same session.
2050 * Applications can control the behaviour. They can at any time
2051 * set a 'desirable' servername for a new SSL object. This can be the
2052 * case for example with HTTPS when a Host: header field is received and
2053 * a renegotiation is requested. In this case, a possible servername
2054 * presented in the new client hello is only acknowledged if it matches
2055 * the value of the Host: field.
2056 * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
2057 * if they provide for changing an explicit servername context for the
2058 * session, i.e. when the session has been established with a servername
2060 * - On session reconnect, the servername extension may be absent.
2064 else if (currext->type == TLSEXT_TYPE_server_name) {
2065 unsigned int servname_type;
2066 PACKET sni, hostname;
2068 if (!PACKET_as_length_prefixed_2(&currext->data, &sni)
2069 /* ServerNameList must be at least 1 byte long. */
2070 || PACKET_remaining(&sni) == 0) {
2075 * Although the server_name extension was intended to be
2076 * extensible to new name types, RFC 4366 defined the
2077 * syntax inextensibility and OpenSSL 1.0.x parses it as
2079 * RFC 6066 corrected the mistake but adding new name types
2080 * is nevertheless no longer feasible, so act as if no other
2081 * SNI types can exist, to simplify parsing.
2083 * Also note that the RFC permits only one SNI value per type,
2084 * i.e., we can only have a single hostname.
2086 if (!PACKET_get_1(&sni, &servname_type)
2087 || servname_type != TLSEXT_NAMETYPE_host_name
2088 || !PACKET_as_length_prefixed_2(&sni, &hostname)) {
2093 if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) {
2094 *al = TLS1_AD_UNRECOGNIZED_NAME;
2098 if (PACKET_contains_zero_byte(&hostname)) {
2099 *al = TLS1_AD_UNRECOGNIZED_NAME;
2103 if (!PACKET_strndup(&hostname, &s->session->tlsext_hostname)) {
2104 *al = TLS1_AD_INTERNAL_ERROR;
2108 s->servername_done = 1;
2111 * TODO(openssl-team): if the SNI doesn't match, we MUST
2112 * fall back to a full handshake.
2114 s->servername_done = s->session->tlsext_hostname
2115 && PACKET_equal(&hostname, s->session->tlsext_hostname,
2116 strlen(s->session->tlsext_hostname));
2119 #ifndef OPENSSL_NO_SRP
2120 else if (currext->type == TLSEXT_TYPE_srp) {
2123 if (!PACKET_as_length_prefixed_1(&currext->data, &srp_I))
2126 if (PACKET_contains_zero_byte(&srp_I))
2130 * TODO(openssl-team): currently, we re-authenticate the user
2131 * upon resumption. Instead, we MUST ignore the login.
2133 if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) {
2134 *al = TLS1_AD_INTERNAL_ERROR;
2140 #ifndef OPENSSL_NO_EC
2141 else if (currext->type == TLSEXT_TYPE_ec_point_formats) {
2142 PACKET ec_point_format_list;
2144 if (!PACKET_as_length_prefixed_1(&currext->data,
2145 &ec_point_format_list)
2146 || PACKET_remaining(&ec_point_format_list) == 0) {
2151 if (!PACKET_memdup(&ec_point_format_list,
2152 &s->session->tlsext_ecpointformatlist,
2154 session->tlsext_ecpointformatlist_length)) {
2155 *al = TLS1_AD_INTERNAL_ERROR;
2160 #endif /* OPENSSL_NO_EC */
2161 else if (currext->type == TLSEXT_TYPE_session_ticket) {
2162 if (s->tls_session_ticket_ext_cb &&
2163 !s->tls_session_ticket_ext_cb(s,
2164 PACKET_data(&currext->data),
2165 PACKET_remaining(&currext->data),
2166 s->tls_session_ticket_ext_cb_arg)) {
2167 *al = TLS1_AD_INTERNAL_ERROR;
2170 } else if (currext->type == TLSEXT_TYPE_signature_algorithms) {
2171 PACKET supported_sig_algs;
2173 if (!PACKET_as_length_prefixed_2(&currext->data,
2174 &supported_sig_algs)
2175 || (PACKET_remaining(&supported_sig_algs) % 2) != 0
2176 || PACKET_remaining(&supported_sig_algs) == 0) {
2181 if (!tls1_save_sigalgs(s, PACKET_data(&supported_sig_algs),
2182 PACKET_remaining(&supported_sig_algs))) {
2186 } else if (currext->type == TLSEXT_TYPE_status_request) {
2187 if (!PACKET_get_1(&currext->data,
2188 (unsigned int *)&s->tlsext_status_type)) {
2191 #ifndef OPENSSL_NO_OCSP
2192 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
2193 const unsigned char *ext_data;
2194 PACKET responder_id_list, exts;
2195 if (!PACKET_get_length_prefixed_2
2196 (&currext->data, &responder_id_list))
2200 * We remove any OCSP_RESPIDs from a previous handshake
2201 * to prevent unbounded memory growth - CVE-2016-6304
2203 sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids,
2205 if (PACKET_remaining(&responder_id_list) > 0) {
2206 s->tlsext_ocsp_ids = sk_OCSP_RESPID_new_null();
2207 if (s->tlsext_ocsp_ids == NULL) {
2208 *al = SSL_AD_INTERNAL_ERROR;
2212 s->tlsext_ocsp_ids = NULL;
2215 while (PACKET_remaining(&responder_id_list) > 0) {
2217 PACKET responder_id;
2218 const unsigned char *id_data;
2220 if (!PACKET_get_length_prefixed_2(&responder_id_list,
2222 || PACKET_remaining(&responder_id) == 0) {
2226 id_data = PACKET_data(&responder_id);
2227 /* TODO(size_t): Convert d2i_* to size_t */
2228 id = d2i_OCSP_RESPID(NULL, &id_data,
2229 (int)PACKET_remaining(&responder_id));
2233 if (id_data != PACKET_end(&responder_id)) {
2234 OCSP_RESPID_free(id);
2238 if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) {
2239 OCSP_RESPID_free(id);
2240 *al = SSL_AD_INTERNAL_ERROR;
2245 /* Read in request_extensions */
2246 if (!PACKET_as_length_prefixed_2(
2247 &currext->data, &exts))
2250 if (PACKET_remaining(&exts) > 0) {
2251 ext_data = PACKET_data(&exts);
2252 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2253 X509_EXTENSION_free);
2254 s->tlsext_ocsp_exts =
2255 d2i_X509_EXTENSIONS(NULL, &ext_data,
2256 (int)PACKET_remaining(&exts));
2257 if (s->tlsext_ocsp_exts == NULL
2258 || ext_data != PACKET_end(&exts)) {
2266 * We don't know what to do with any other type so ignore it.
2268 s->tlsext_status_type = -1;
2271 #ifndef OPENSSL_NO_NEXTPROTONEG
2272 else if (currext->type == TLSEXT_TYPE_next_proto_neg
2273 && s->s3->tmp.finish_md_len == 0) {
2275 * We shouldn't accept this extension on a
2278 * s->new_session will be set on renegotiation, but we
2279 * probably shouldn't rely that it couldn't be set on
2280 * the initial renegotiation too in certain cases (when
2281 * there's some other reason to disallow resuming an
2282 * earlier session -- the current code won't be doing
2283 * anything like that, but this might change).
2285 * A valid sign that there's been a previous handshake
2286 * in this connection is if s->s3->tmp.finish_md_len >
2287 * 0. (We are talking about a check that will happen
2288 * in the Hello protocol round, well before a new
2289 * Finished message could have been computed.)
2291 s->s3->next_proto_neg_seen = 1;
2295 else if (currext->type
2296 == TLSEXT_TYPE_application_layer_protocol_negotiation
2297 && s->s3->tmp.finish_md_len == 0) {
2298 if (!tls1_alpn_handle_client_hello(s,
2299 &currext->data, al))
2303 /* session ticket processed earlier */
2304 #ifndef OPENSSL_NO_SRTP
2305 else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
2306 && currext->type == TLSEXT_TYPE_use_srtp) {
2307 if (ssl_parse_clienthello_use_srtp_ext(s,
2308 &currext->data, al))
2312 else if (currext->type == TLSEXT_TYPE_encrypt_then_mac
2313 && !(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)) {
2314 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2315 } else if (currext->type == TLSEXT_TYPE_key_share
2316 && s->version == TLS1_3_VERSION && !s->hit) {
2317 unsigned int group_id;
2318 PACKET key_share_list, encoded_pt;
2319 const unsigned char *curves;
2322 unsigned int curve_flags;
2325 if (s->s3->peer_tmp != NULL) {
2326 *al = SSL_AD_INTERNAL_ERROR;
2327 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
2331 if (!PACKET_as_length_prefixed_2(&currext->data, &key_share_list)) {
2332 *al = SSL_AD_HANDSHAKE_FAILURE;
2333 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2334 SSL_R_LENGTH_MISMATCH);
2338 while (PACKET_remaining(&key_share_list) > 0) {
2339 if (!PACKET_get_net_2(&key_share_list, &group_id)
2340 || !PACKET_get_length_prefixed_2(&key_share_list,
2342 *al = SSL_AD_HANDSHAKE_FAILURE;
2343 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2344 SSL_R_LENGTH_MISMATCH);
2348 /* Check this share is in supported_groups */
2349 if (!tls1_get_curvelist(s, 1, &curves, &num_curves)) {
2350 *al = SSL_AD_INTERNAL_ERROR;
2351 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2352 ERR_R_INTERNAL_ERROR);
2355 if (!check_in_list(s, group_id, curves, num_curves, 0)) {
2356 *al = SSL_AD_HANDSHAKE_FAILURE;
2357 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2358 SSL_R_BAD_KEY_SHARE);
2362 /* Find a share that we can use */
2363 if (!tls1_get_curvelist(s, 0, &curves, &num_curves)) {
2364 *al = SSL_AD_INTERNAL_ERROR;
2365 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2366 ERR_R_INTERNAL_ERROR);
2369 if (!check_in_list(s, group_id, curves, num_curves, 1)) {
2370 /* Share not suitable */
2374 group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
2376 if (group_nid == 0) {
2377 *al = SSL_AD_INTERNAL_ERROR;
2378 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2379 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
2383 if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
2384 /* Can happen for some curves, e.g. X25519 */
2385 EVP_PKEY *key = EVP_PKEY_new();
2387 if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
2388 *al = SSL_AD_INTERNAL_ERROR;
2389 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
2393 s->s3->peer_tmp = key;
2395 /* Set up EVP_PKEY with named curve as parameters */
2396 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
2398 || EVP_PKEY_paramgen_init(pctx) <= 0
2399 || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
2401 || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
2402 *al = SSL_AD_INTERNAL_ERROR;
2403 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
2404 EVP_PKEY_CTX_free(pctx);
2407 EVP_PKEY_CTX_free(pctx);
2410 s->s3->group_id = group_id;
2412 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
2413 PACKET_data(&encoded_pt),
2414 PACKET_remaining(&encoded_pt))) {
2415 *al = SSL_AD_DECODE_ERROR;
2416 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, SSL_R_BAD_ECPOINT);
2422 * Note: extended master secret extension handled in
2423 * tls_check_client_ems_support()
2427 * If this ClientHello extension was unhandled and this is a
2428 * nonresumed connection, check whether the extension is a custom
2429 * TLS Extension (has a custom_srv_ext_record), and if so call the
2430 * callback and record the extension number so that an appropriate
2431 * ServerHello may be later returned.
2434 if (custom_ext_parse(s, 1, currext->type,
2435 PACKET_data(&currext->data),
2436 PACKET_remaining(&currext->data), al) <= 0)
2441 /* Need RI if renegotiating */
2443 if (!renegotiate_seen && s->renegotiate &&
2444 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
2445 *al = SSL_AD_HANDSHAKE_FAILURE;
2446 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
2447 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2452 * This function currently has no state to clean up, so it returns directly.
2453 * If parsing fails at any point, the function returns early.
2454 * The SSL object may be left with partial data from extensions, but it must
2455 * then no longer be used, and clearing it up will free the leftovers.
2460 int ssl_parse_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello)
2463 custom_ext_init(&s->cert->srv_ext);
2464 if (ssl_scan_clienthello_tlsext(s, hello, &al) <= 0) {
2465 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2468 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
2469 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_CLIENTHELLO_TLSEXT);
2475 #ifndef OPENSSL_NO_NEXTPROTONEG
2477 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2478 * elements of zero length are allowed and the set of elements must exactly
2479 * fill the length of the block.
2481 static char ssl_next_proto_validate(PACKET *pkt)
2483 PACKET tmp_protocol;
2485 while (PACKET_remaining(pkt)) {
2486 if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol)
2487 || PACKET_remaining(&tmp_protocol) == 0)
2495 static int ssl_scan_serverhello_tlsext(SSL *s, PACKET *pkt, int *al)
2497 unsigned int length, type, size;
2498 int tlsext_servername = 0;
2499 int renegotiate_seen = 0;
2501 #ifndef OPENSSL_NO_NEXTPROTONEG
2502 s->s3->next_proto_neg_seen = 0;
2504 s->tlsext_ticket_expected = 0;
2506 OPENSSL_free(s->s3->alpn_selected);
2507 s->s3->alpn_selected = NULL;
2509 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2511 s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
2513 if (!PACKET_get_net_2(pkt, &length))
2516 if (PACKET_remaining(pkt) != length) {
2517 *al = SSL_AD_DECODE_ERROR;
2521 if (!tls1_check_duplicate_extensions(pkt)) {
2522 *al = SSL_AD_DECODE_ERROR;
2526 while (PACKET_get_net_2(pkt, &type) && PACKET_get_net_2(pkt, &size)) {
2527 const unsigned char *data;
2530 if (!PACKET_get_sub_packet(pkt, &spkt, size)
2531 || !PACKET_peek_bytes(&spkt, &data, size))
2534 if (s->tlsext_debug_cb)
2535 s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg);
2537 if (type == TLSEXT_TYPE_renegotiate) {
2538 if (!ssl_parse_serverhello_renegotiate_ext(s, &spkt, al))
2540 renegotiate_seen = 1;
2541 } else if (s->version == SSL3_VERSION) {
2542 } else if (type == TLSEXT_TYPE_server_name) {
2543 if (s->tlsext_hostname == NULL || size > 0) {
2544 *al = TLS1_AD_UNRECOGNIZED_NAME;
2547 tlsext_servername = 1;
2549 #ifndef OPENSSL_NO_EC
2550 else if (type == TLSEXT_TYPE_ec_point_formats) {
2551 unsigned int ecpointformatlist_length;
2552 if (!PACKET_get_1(&spkt, &ecpointformatlist_length)
2553 || ecpointformatlist_length != size - 1) {
2554 *al = TLS1_AD_DECODE_ERROR;
2558 s->session->tlsext_ecpointformatlist_length = 0;
2559 OPENSSL_free(s->session->tlsext_ecpointformatlist);
2560 if ((s->session->tlsext_ecpointformatlist =
2561 OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
2562 *al = TLS1_AD_INTERNAL_ERROR;
2565 s->session->tlsext_ecpointformatlist_length =
2566 ecpointformatlist_length;
2567 if (!PACKET_copy_bytes(&spkt,
2568 s->session->tlsext_ecpointformatlist,
2569 ecpointformatlist_length)) {
2570 *al = TLS1_AD_DECODE_ERROR;
2576 #endif /* OPENSSL_NO_EC */
2578 else if (type == TLSEXT_TYPE_session_ticket) {
2579 if (s->tls_session_ticket_ext_cb &&
2580 !s->tls_session_ticket_ext_cb(s, data, size,
2581 s->tls_session_ticket_ext_cb_arg))
2583 *al = TLS1_AD_INTERNAL_ERROR;
2586 if (!tls_use_ticket(s) || (size > 0)) {
2587 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2590 s->tlsext_ticket_expected = 1;
2591 } else if (type == TLSEXT_TYPE_status_request) {
2593 * MUST be empty and only sent if we've requested a status
2596 if ((s->tlsext_status_type == -1) || (size > 0)) {
2597 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2600 /* Set flag to expect CertificateStatus message */
2601 s->tlsext_status_expected = 1;
2603 #ifndef OPENSSL_NO_CT
2605 * Only take it if we asked for it - i.e if there is no CT validation
2606 * callback set, then a custom extension MAY be processing it, so we
2607 * need to let control continue to flow to that.
2609 else if (type == TLSEXT_TYPE_signed_certificate_timestamp &&
2610 s->ct_validation_callback != NULL) {
2611 /* Simply copy it off for later processing */
2612 if (s->tlsext_scts != NULL) {
2613 OPENSSL_free(s->tlsext_scts);
2614 s->tlsext_scts = NULL;
2616 s->tlsext_scts_len = size;
2618 s->tlsext_scts = OPENSSL_malloc(size);
2619 if (s->tlsext_scts == NULL) {
2620 *al = TLS1_AD_INTERNAL_ERROR;
2623 memcpy(s->tlsext_scts, data, size);
2627 #ifndef OPENSSL_NO_NEXTPROTONEG
2628 else if (type == TLSEXT_TYPE_next_proto_neg &&
2629 s->s3->tmp.finish_md_len == 0) {
2630 unsigned char *selected;
2631 unsigned char selected_len;
2632 /* We must have requested it. */
2633 if (s->ctx->next_proto_select_cb == NULL) {
2634 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2637 /* The data must be valid */
2638 if (!ssl_next_proto_validate(&spkt)) {
2639 *al = TLS1_AD_DECODE_ERROR;
2642 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data,
2645 ctx->next_proto_select_cb_arg) !=
2646 SSL_TLSEXT_ERR_OK) {
2647 *al = TLS1_AD_INTERNAL_ERROR;
2651 * Could be non-NULL if server has sent multiple NPN extensions in
2652 * a single Serverhello
2654 OPENSSL_free(s->next_proto_negotiated);
2655 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2656 if (s->next_proto_negotiated == NULL) {
2657 *al = TLS1_AD_INTERNAL_ERROR;
2660 memcpy(s->next_proto_negotiated, selected, selected_len);
2661 s->next_proto_negotiated_len = selected_len;
2662 s->s3->next_proto_neg_seen = 1;
2666 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation) {
2668 /* We must have requested it. */
2669 if (!s->s3->alpn_sent) {
2670 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2674 * The extension data consists of:
2675 * uint16 list_length
2676 * uint8 proto_length;
2677 * uint8 proto[proto_length];
2679 if (!PACKET_get_net_2(&spkt, &len)
2680 || PACKET_remaining(&spkt) != len || !PACKET_get_1(&spkt, &len)
2681 || PACKET_remaining(&spkt) != len) {
2682 *al = TLS1_AD_DECODE_ERROR;
2685 OPENSSL_free(s->s3->alpn_selected);
2686 s->s3->alpn_selected = OPENSSL_malloc(len);
2687 if (s->s3->alpn_selected == NULL) {
2688 *al = TLS1_AD_INTERNAL_ERROR;
2691 if (!PACKET_copy_bytes(&spkt, s->s3->alpn_selected, len)) {
2692 *al = TLS1_AD_DECODE_ERROR;
2695 s->s3->alpn_selected_len = len;
2697 #ifndef OPENSSL_NO_SRTP
2698 else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) {
2699 if (ssl_parse_serverhello_use_srtp_ext(s, &spkt, al))
2703 else if (type == TLSEXT_TYPE_encrypt_then_mac) {
2704 /* Ignore if inappropriate ciphersuite */
2705 if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC) &&
2706 s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
2707 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
2708 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2709 } else if (type == TLSEXT_TYPE_extended_master_secret &&
2710 (SSL_IS_DTLS(s) || s->version < TLS1_3_VERSION)) {
2711 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
2713 s->session->flags |= SSL_SESS_FLAG_EXTMS;
2714 } else if (type == TLSEXT_TYPE_key_share
2715 && s->version == TLS1_3_VERSION) {
2716 unsigned int group_id;
2718 EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
2722 *al = SSL_AD_INTERNAL_ERROR;
2723 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
2727 if (!PACKET_get_net_2(&spkt, &group_id)) {
2728 *al = SSL_AD_HANDSHAKE_FAILURE;
2729 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2730 SSL_R_LENGTH_MISMATCH);
2734 if (group_id != s->s3->group_id) {
2736 * This isn't for the group that we sent in the original
2739 *al = SSL_AD_HANDSHAKE_FAILURE;
2740 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2741 SSL_R_BAD_KEY_SHARE);
2745 skey = ssl_generate_pkey(ckey);
2747 if (!PACKET_as_length_prefixed_2(&spkt, &encoded_pt)) {
2748 *al = SSL_AD_DECODE_ERROR;
2749 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2750 SSL_R_LENGTH_MISMATCH);
2754 if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
2755 PACKET_remaining(&encoded_pt))) {
2756 *al = SSL_AD_DECODE_ERROR;
2757 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, SSL_R_BAD_ECPOINT);
2761 if (ssl_derive(s, ckey, skey, 1) == 0) {
2762 *al = SSL_AD_INTERNAL_ERROR;
2763 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
2764 EVP_PKEY_free(skey);
2767 EVP_PKEY_free(skey);
2769 * If this extension type was not otherwise handled, but matches a
2770 * custom_cli_ext_record, then send it to the c callback
2772 } else if (custom_ext_parse(s, 0, type, data, size, al) <= 0)
2776 if (PACKET_remaining(pkt) != 0) {
2777 *al = SSL_AD_DECODE_ERROR;
2781 if (!s->hit && tlsext_servername == 1) {
2782 if (s->tlsext_hostname) {
2783 if (s->session->tlsext_hostname == NULL) {
2784 s->session->tlsext_hostname =
2785 OPENSSL_strdup(s->tlsext_hostname);
2786 if (!s->session->tlsext_hostname) {
2787 *al = SSL_AD_UNRECOGNIZED_NAME;
2791 *al = SSL_AD_DECODE_ERROR;
2800 * Determine if we need to see RI. Strictly speaking if we want to avoid
2801 * an attack we should *always* see RI even on initial server hello
2802 * because the client doesn't see any renegotiation during an attack.
2803 * However this would mean we could not connect to any server which
2804 * doesn't support RI so for the immediate future tolerate RI absence
2806 if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
2807 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
2808 *al = SSL_AD_HANDSHAKE_FAILURE;
2809 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
2810 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2816 * Check extended master secret extension is consistent with
2819 if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
2820 !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
2821 *al = SSL_AD_HANDSHAKE_FAILURE;
2822 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, SSL_R_INCONSISTENT_EXTMS);
2830 int ssl_prepare_clienthello_tlsext(SSL *s)
2832 s->s3->alpn_sent = 0;
2836 int ssl_prepare_serverhello_tlsext(SSL *s)
2841 static int ssl_check_clienthello_tlsext_early(SSL *s)
2843 int ret = SSL_TLSEXT_ERR_NOACK;
2844 int al = SSL_AD_UNRECOGNIZED_NAME;
2846 #ifndef OPENSSL_NO_EC
2848 * The handling of the ECPointFormats extension is done elsewhere, namely
2849 * in ssl3_choose_cipher in s3_lib.c.
2852 * The handling of the EllipticCurves extension is done elsewhere, namely
2853 * in ssl3_choose_cipher in s3_lib.c.
2857 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2859 s->ctx->tlsext_servername_callback(s, &al,
2860 s->ctx->tlsext_servername_arg);
2861 else if (s->initial_ctx != NULL
2862 && s->initial_ctx->tlsext_servername_callback != 0)
2864 s->initial_ctx->tlsext_servername_callback(s, &al,
2866 initial_ctx->tlsext_servername_arg);
2869 case SSL_TLSEXT_ERR_ALERT_FATAL:
2870 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2873 case SSL_TLSEXT_ERR_ALERT_WARNING:
2874 ssl3_send_alert(s, SSL3_AL_WARNING, al);
2877 case SSL_TLSEXT_ERR_NOACK:
2878 s->servername_done = 0;
2884 /* Initialise digests to default values */
2885 void ssl_set_default_md(SSL *s)
2887 const EVP_MD **pmd = s->s3->tmp.md;
2888 #ifndef OPENSSL_NO_DSA
2889 pmd[SSL_PKEY_DSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX);
2891 #ifndef OPENSSL_NO_RSA
2892 if (SSL_USE_SIGALGS(s))
2893 pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX);
2895 pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_MD5_SHA1_IDX);
2896 pmd[SSL_PKEY_RSA_ENC] = pmd[SSL_PKEY_RSA_SIGN];
2898 #ifndef OPENSSL_NO_EC
2899 pmd[SSL_PKEY_ECC] = ssl_md(SSL_MD_SHA1_IDX);
2901 #ifndef OPENSSL_NO_GOST
2902 pmd[SSL_PKEY_GOST01] = ssl_md(SSL_MD_GOST94_IDX);
2903 pmd[SSL_PKEY_GOST12_256] = ssl_md(SSL_MD_GOST12_256_IDX);
2904 pmd[SSL_PKEY_GOST12_512] = ssl_md(SSL_MD_GOST12_512_IDX);
2908 int tls1_set_server_sigalgs(SSL *s)
2913 /* Clear any shared signature algorithms */
2914 OPENSSL_free(s->cert->shared_sigalgs);
2915 s->cert->shared_sigalgs = NULL;
2916 s->cert->shared_sigalgslen = 0;
2917 /* Clear certificate digests and validity flags */
2918 for (i = 0; i < SSL_PKEY_NUM; i++) {
2919 s->s3->tmp.md[i] = NULL;
2920 s->s3->tmp.valid_flags[i] = 0;
2923 /* If sigalgs received process it. */
2924 if (s->s3->tmp.peer_sigalgs) {
2925 if (!tls1_process_sigalgs(s)) {
2926 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE);
2927 al = SSL_AD_INTERNAL_ERROR;
2930 /* Fatal error is no shared signature algorithms */
2931 if (!s->cert->shared_sigalgs) {
2932 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
2933 SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
2934 al = SSL_AD_ILLEGAL_PARAMETER;
2938 ssl_set_default_md(s);
2942 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2947 * Upon success, returns 1.
2948 * Upon failure, returns 0 and sets |al| to the appropriate fatal alert.
2950 int ssl_check_clienthello_tlsext_late(SSL *s, int *al)
2952 s->tlsext_status_expected = 0;
2955 * If status request then ask callback what to do. Note: this must be
2956 * called after servername callbacks in case the certificate has changed,
2957 * and must be called after the cipher has been chosen because this may
2958 * influence which certificate is sent
2960 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) {
2962 CERT_PKEY *certpkey;
2963 certpkey = ssl_get_server_send_pkey(s);
2964 /* If no certificate can't return certificate status */
2965 if (certpkey != NULL) {
2967 * Set current certificate to one we will use so SSL_get_certificate
2968 * et al can pick it up.
2970 s->cert->key = certpkey;
2971 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2973 /* We don't want to send a status request response */
2974 case SSL_TLSEXT_ERR_NOACK:
2975 s->tlsext_status_expected = 0;
2977 /* status request response should be sent */
2978 case SSL_TLSEXT_ERR_OK:
2979 if (s->tlsext_ocsp_resp)
2980 s->tlsext_status_expected = 1;
2982 /* something bad happened */
2983 case SSL_TLSEXT_ERR_ALERT_FATAL:
2985 *al = SSL_AD_INTERNAL_ERROR;
2991 if (!tls1_alpn_handle_client_hello_late(s, al)) {
2998 int ssl_check_serverhello_tlsext(SSL *s)
3000 int ret = SSL_TLSEXT_ERR_NOACK;
3001 int al = SSL_AD_UNRECOGNIZED_NAME;
3003 #ifndef OPENSSL_NO_EC
3005 * If we are client and using an elliptic curve cryptography cipher
3006 * suite, then if server returns an EC point formats lists extension it
3007 * must contain uncompressed.
3009 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3010 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3011 if ((s->tlsext_ecpointformatlist != NULL)
3012 && (s->tlsext_ecpointformatlist_length > 0)
3013 && (s->session->tlsext_ecpointformatlist != NULL)
3014 && (s->session->tlsext_ecpointformatlist_length > 0)
3015 && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
3016 /* we are using an ECC cipher */
3018 unsigned char *list;
3019 int found_uncompressed = 0;
3020 list = s->session->tlsext_ecpointformatlist;
3021 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) {
3022 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) {
3023 found_uncompressed = 1;
3027 if (!found_uncompressed) {
3028 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,
3029 SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
3033 ret = SSL_TLSEXT_ERR_OK;
3034 #endif /* OPENSSL_NO_EC */
3036 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
3038 s->ctx->tlsext_servername_callback(s, &al,
3039 s->ctx->tlsext_servername_arg);
3040 else if (s->initial_ctx != NULL
3041 && s->initial_ctx->tlsext_servername_callback != 0)
3043 s->initial_ctx->tlsext_servername_callback(s, &al,
3045 initial_ctx->tlsext_servername_arg);
3048 * Ensure we get sensible values passed to tlsext_status_cb in the event
3049 * that we don't receive a status message
3051 OPENSSL_free(s->tlsext_ocsp_resp);
3052 s->tlsext_ocsp_resp = NULL;
3053 s->tlsext_ocsp_resplen = 0;
3056 case SSL_TLSEXT_ERR_ALERT_FATAL:
3057 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3060 case SSL_TLSEXT_ERR_ALERT_WARNING:
3061 ssl3_send_alert(s, SSL3_AL_WARNING, al);
3064 case SSL_TLSEXT_ERR_NOACK:
3065 s->servername_done = 0;
3071 int ssl_parse_serverhello_tlsext(SSL *s, PACKET *pkt)
3074 if (s->version < SSL3_VERSION)
3076 if (ssl_scan_serverhello_tlsext(s, pkt, &al) <= 0) {
3077 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3081 if (ssl_check_serverhello_tlsext(s) <= 0) {
3082 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_SERVERHELLO_TLSEXT);
3089 * Given a list of extensions that we collected earlier, find one of a given
3090 * type and return it.
3092 * |exts| is the set of extensions previously collected.
3093 * |numexts| is the number of extensions that we have.
3094 * |type| the type of the extension that we are looking for.
3096 * Returns a pointer to the found RAW_EXTENSION data, or NULL if not found.
3098 RAW_EXTENSION *tls_get_extension_by_type(RAW_EXTENSION *exts, size_t numexts,
3103 for (loop = 0; loop < numexts; loop++) {
3104 if (exts[loop].type == type)
3112 * Gets the ticket information supplied by the client if any.
3114 * hello: The parsed ClientHello data
3115 * ret: (output) on return, if a ticket was decrypted, then this is set to
3116 * point to the resulting session.
3118 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3119 * ciphersuite, in which case we have no use for session tickets and one will
3120 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3123 * -1: fatal error, either from parsing or decrypting the ticket.
3124 * 0: no ticket was found (or was ignored, based on settings).
3125 * 1: a zero length extension was found, indicating that the client supports
3126 * session tickets but doesn't currently have one to offer.
3127 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
3128 * couldn't be decrypted because of a non-fatal error.
3129 * 3: a ticket was successfully decrypted and *ret was set.
3132 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3133 * a new session ticket to the client because the client indicated support
3134 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3135 * a session ticket or we couldn't use the one it gave us, or if
3136 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3137 * Otherwise, s->tlsext_ticket_expected is set to 0.
3139 int tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
3143 const unsigned char *etick;
3145 RAW_EXTENSION *ticketext;
3148 s->tlsext_ticket_expected = 0;
3151 * If tickets disabled behave as if no ticket present to permit stateful
3154 if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
3157 ticketext = tls_get_extension_by_type(hello->pre_proc_exts,
3158 hello->num_extensions,
3159 TLSEXT_TYPE_session_ticket);
3160 if (ticketext == NULL)
3163 size = PACKET_remaining(&ticketext->data);
3166 * The client will accept a ticket but doesn't currently have
3169 s->tlsext_ticket_expected = 1;
3172 if (s->tls_session_secret_cb) {
3174 * Indicate that the ticket couldn't be decrypted rather than
3175 * generating the session from ticket now, trigger
3176 * abbreviated handshake based on external mechanism to
3177 * calculate the master secret later.
3181 if (!PACKET_get_bytes(&ticketext->data, &etick, size)) {
3182 /* Shouldn't ever happen */
3185 retv = tls_decrypt_ticket(s, etick, size, hello->session_id,
3186 hello->session_id_len, ret);
3188 case 2: /* ticket couldn't be decrypted */
3189 s->tlsext_ticket_expected = 1;
3192 case 3: /* ticket was decrypted */
3195 case 4: /* ticket decrypted but need to renew */
3196 s->tlsext_ticket_expected = 1;
3199 default: /* fatal error */
3205 * Sets the extended master secret flag if the extension is present in the
3206 * ClientHello and we can support it
3211 int tls_check_client_ems_support(SSL *s, const CLIENTHELLO_MSG *hello)
3213 RAW_EXTENSION *emsext;
3215 s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
3217 if (!SSL_IS_DTLS(s) && (s->version < TLS1_VERSION
3218 || s->version > TLS1_2_VERSION))
3221 emsext = tls_get_extension_by_type(hello->pre_proc_exts,
3222 hello->num_extensions,
3223 TLSEXT_TYPE_extended_master_secret);
3226 * No extensions is a success - we have successfully discovered that the
3227 * client doesn't support EMS.
3232 /* The extensions must always be empty */
3233 if (PACKET_remaining(&emsext->data) != 0)
3236 s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
3242 * tls_decrypt_ticket attempts to decrypt a session ticket.
3244 * etick: points to the body of the session ticket extension.
3245 * eticklen: the length of the session tickets extension.
3246 * sess_id: points at the session ID.
3247 * sesslen: the length of the session ID.
3248 * psess: (output) on return, if a ticket was decrypted, then this is set to
3249 * point to the resulting session.
3252 * -2: fatal error, malloc failure.
3253 * -1: fatal error, either from parsing or decrypting the ticket.
3254 * 2: the ticket couldn't be decrypted.
3255 * 3: a ticket was successfully decrypted and *psess was set.
3256 * 4: same as 3, but the ticket needs to be renewed.
3258 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick,
3259 size_t eticklen, const unsigned char *sess_id,
3260 size_t sesslen, SSL_SESSION **psess)
3263 unsigned char *sdec;
3264 const unsigned char *p;
3265 int slen, renew_ticket = 0, ret = -1, declen;
3267 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3268 HMAC_CTX *hctx = NULL;
3269 EVP_CIPHER_CTX *ctx;
3270 SSL_CTX *tctx = s->initial_ctx;
3272 /* Initialize session ticket encryption and HMAC contexts */
3273 hctx = HMAC_CTX_new();
3276 ctx = EVP_CIPHER_CTX_new();
3281 if (tctx->tlsext_ticket_key_cb) {
3282 unsigned char *nctick = (unsigned char *)etick;
3283 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
3294 /* Check key name matches */
3295 if (memcmp(etick, tctx->tlsext_tick_key_name,
3296 sizeof(tctx->tlsext_tick_key_name)) != 0) {
3300 if (HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
3301 sizeof(tctx->tlsext_tick_hmac_key),
3302 EVP_sha256(), NULL) <= 0
3303 || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
3304 tctx->tlsext_tick_aes_key,
3305 etick + sizeof(tctx->tlsext_tick_key_name)) <=
3311 * Attempt to process session ticket, first conduct sanity and integrity
3314 mlen = HMAC_size(hctx);
3318 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
3320 TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
3325 /* Check HMAC of encrypted ticket */
3326 if (HMAC_Update(hctx, etick, eticklen) <= 0
3327 || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
3330 HMAC_CTX_free(hctx);
3331 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
3332 EVP_CIPHER_CTX_free(ctx);
3335 /* Attempt to decrypt session data */
3336 /* Move p after IV to start of encrypted ticket, update length */
3337 p = etick + 16 + EVP_CIPHER_CTX_iv_length(ctx);
3338 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(ctx);
3339 sdec = OPENSSL_malloc(eticklen);
3340 if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
3341 (int)eticklen) <= 0) {
3342 EVP_CIPHER_CTX_free(ctx);
3346 if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
3347 EVP_CIPHER_CTX_free(ctx);
3352 EVP_CIPHER_CTX_free(ctx);
3356 sess = d2i_SSL_SESSION(NULL, &p, slen);
3360 * The session ID, if non-empty, is used by some clients to detect
3361 * that the ticket has been accepted. So we copy it to the session
3362 * structure. If it is empty set length to zero as required by
3366 memcpy(sess->session_id, sess_id, sesslen);
3367 sess->session_id_length = sesslen;
3376 * For session parse failure, indicate that we need to send a new ticket.
3380 EVP_CIPHER_CTX_free(ctx);
3381 HMAC_CTX_free(hctx);
3385 /* Tables to translate from NIDs to TLS v1.2 ids */
3392 static const tls12_lookup tls12_md[] = {
3393 {NID_md5, TLSEXT_hash_md5},
3394 {NID_sha1, TLSEXT_hash_sha1},
3395 {NID_sha224, TLSEXT_hash_sha224},
3396 {NID_sha256, TLSEXT_hash_sha256},
3397 {NID_sha384, TLSEXT_hash_sha384},
3398 {NID_sha512, TLSEXT_hash_sha512},
3399 {NID_id_GostR3411_94, TLSEXT_hash_gostr3411},
3400 {NID_id_GostR3411_2012_256, TLSEXT_hash_gostr34112012_256},
3401 {NID_id_GostR3411_2012_512, TLSEXT_hash_gostr34112012_512},
3404 static const tls12_lookup tls12_sig[] = {
3405 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
3406 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
3407 {EVP_PKEY_EC, TLSEXT_signature_ecdsa},
3408 {NID_id_GostR3410_2001, TLSEXT_signature_gostr34102001},
3409 {NID_id_GostR3410_2012_256, TLSEXT_signature_gostr34102012_256},
3410 {NID_id_GostR3410_2012_512, TLSEXT_signature_gostr34102012_512}
3413 static int tls12_find_id(int nid, const tls12_lookup *table, size_t tlen)
3416 for (i = 0; i < tlen; i++) {
3417 if (table[i].nid == nid)
3423 static int tls12_find_nid(int id, const tls12_lookup *table, size_t tlen)
3426 for (i = 0; i < tlen; i++) {
3427 if ((table[i].id) == id)
3428 return table[i].nid;
3433 int tls12_get_sigandhash(WPACKET *pkt, const EVP_PKEY *pk, const EVP_MD *md)
3439 md_id = tls12_find_id(EVP_MD_type(md), tls12_md, OSSL_NELEM(tls12_md));
3442 sig_id = tls12_get_sigid(pk);
3445 if (!WPACKET_put_bytes_u8(pkt, md_id) || !WPACKET_put_bytes_u8(pkt, sig_id))
3451 int tls12_get_sigid(const EVP_PKEY *pk)
3453 return tls12_find_id(EVP_PKEY_id(pk), tls12_sig, OSSL_NELEM(tls12_sig));
3460 unsigned char tlsext_hash;
3463 static const tls12_hash_info tls12_md_info[] = {
3464 {NID_md5, 64, SSL_MD_MD5_IDX, TLSEXT_hash_md5},
3465 {NID_sha1, 80, SSL_MD_SHA1_IDX, TLSEXT_hash_sha1},
3466 {NID_sha224, 112, SSL_MD_SHA224_IDX, TLSEXT_hash_sha224},
3467 {NID_sha256, 128, SSL_MD_SHA256_IDX, TLSEXT_hash_sha256},
3468 {NID_sha384, 192, SSL_MD_SHA384_IDX, TLSEXT_hash_sha384},
3469 {NID_sha512, 256, SSL_MD_SHA512_IDX, TLSEXT_hash_sha512},
3470 {NID_id_GostR3411_94, 128, SSL_MD_GOST94_IDX, TLSEXT_hash_gostr3411},
3471 {NID_id_GostR3411_2012_256, 128, SSL_MD_GOST12_256_IDX,
3472 TLSEXT_hash_gostr34112012_256},
3473 {NID_id_GostR3411_2012_512, 256, SSL_MD_GOST12_512_IDX,
3474 TLSEXT_hash_gostr34112012_512},
3477 static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
3483 for (i = 0; i < OSSL_NELEM(tls12_md_info); i++) {
3484 if (tls12_md_info[i].tlsext_hash == hash_alg)
3485 return tls12_md_info + i;
3491 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3493 const tls12_hash_info *inf;
3494 if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
3496 inf = tls12_get_hash_info(hash_alg);
3499 return ssl_md(inf->md_idx);
3502 static int tls12_get_pkey_idx(unsigned char sig_alg)
3505 #ifndef OPENSSL_NO_RSA
3506 case TLSEXT_signature_rsa:
3507 return SSL_PKEY_RSA_SIGN;
3509 #ifndef OPENSSL_NO_DSA
3510 case TLSEXT_signature_dsa:
3511 return SSL_PKEY_DSA_SIGN;
3513 #ifndef OPENSSL_NO_EC
3514 case TLSEXT_signature_ecdsa:
3515 return SSL_PKEY_ECC;
3517 #ifndef OPENSSL_NO_GOST
3518 case TLSEXT_signature_gostr34102001:
3519 return SSL_PKEY_GOST01;
3521 case TLSEXT_signature_gostr34102012_256:
3522 return SSL_PKEY_GOST12_256;
3524 case TLSEXT_signature_gostr34102012_512:
3525 return SSL_PKEY_GOST12_512;
3531 /* Convert TLS 1.2 signature algorithm extension values into NIDs */
3532 static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3533 int *psignhash_nid, const unsigned char *data)
3535 int sign_nid = NID_undef, hash_nid = NID_undef;
3536 if (!phash_nid && !psign_nid && !psignhash_nid)
3538 if (phash_nid || psignhash_nid) {
3539 hash_nid = tls12_find_nid(data[0], tls12_md, OSSL_NELEM(tls12_md));
3541 *phash_nid = hash_nid;
3543 if (psign_nid || psignhash_nid) {
3544 sign_nid = tls12_find_nid(data[1], tls12_sig, OSSL_NELEM(tls12_sig));
3546 *psign_nid = sign_nid;
3548 if (psignhash_nid) {
3549 if (sign_nid == NID_undef || hash_nid == NID_undef
3550 || OBJ_find_sigid_by_algs(psignhash_nid, hash_nid, sign_nid) <= 0)
3551 *psignhash_nid = NID_undef;
3555 /* Check to see if a signature algorithm is allowed */
3556 static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
3558 /* See if we have an entry in the hash table and it is enabled */
3559 const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
3560 if (hinf == NULL || ssl_md(hinf->md_idx) == NULL)
3562 /* See if public key algorithm allowed */
3563 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3565 /* Finally see if security callback allows it */
3566 return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp);
3570 * Get a mask of disabled public key algorithms based on supported signature
3571 * algorithms. For example if no signature algorithm supports RSA then RSA is
3575 void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
3577 const unsigned char *sigalgs;
3578 size_t i, sigalgslen;
3579 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
3581 * Now go through all signature algorithms seeing if we support any for
3582 * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
3583 * down calls to security callback only check if we have to.
3585 sigalgslen = tls12_get_psigalgs(s, &sigalgs);
3586 for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) {
3587 switch (sigalgs[1]) {
3588 #ifndef OPENSSL_NO_RSA
3589 case TLSEXT_signature_rsa:
3590 if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
3594 #ifndef OPENSSL_NO_DSA
3595 case TLSEXT_signature_dsa:
3596 if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
3600 #ifndef OPENSSL_NO_EC
3601 case TLSEXT_signature_ecdsa:
3602 if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
3609 *pmask_a |= SSL_aRSA;
3611 *pmask_a |= SSL_aDSS;
3613 *pmask_a |= SSL_aECDSA;
3616 int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
3617 const unsigned char *psig, size_t psiglen)
3621 for (i = 0; i < psiglen; i += 2, psig += 2) {
3622 if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig)) {
3623 if (!WPACKET_put_bytes_u8(pkt, psig[0])
3624 || !WPACKET_put_bytes_u8(pkt, psig[1]))
3631 /* Given preference and allowed sigalgs set shared sigalgs */
3632 static size_t tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig,
3633 const unsigned char *pref, size_t preflen,
3634 const unsigned char *allow, size_t allowlen)
3636 const unsigned char *ptmp, *atmp;
3637 size_t i, j, nmatch = 0;
3638 for (i = 0, ptmp = pref; i < preflen; i += 2, ptmp += 2) {
3639 /* Skip disabled hashes or signature algorithms */
3640 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp))
3642 for (j = 0, atmp = allow; j < allowlen; j += 2, atmp += 2) {
3643 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1]) {
3646 shsig->rhash = ptmp[0];
3647 shsig->rsign = ptmp[1];
3648 tls1_lookup_sigalg(&shsig->hash_nid,
3650 &shsig->signandhash_nid, ptmp);
3660 /* Set shared signature algorithms for SSL structures */
3661 static int tls1_set_shared_sigalgs(SSL *s)
3663 const unsigned char *pref, *allow, *conf;
3664 size_t preflen, allowlen, conflen;
3666 TLS_SIGALGS *salgs = NULL;
3668 unsigned int is_suiteb = tls1_suiteb(s);
3670 OPENSSL_free(c->shared_sigalgs);
3671 c->shared_sigalgs = NULL;
3672 c->shared_sigalgslen = 0;
3673 /* If client use client signature algorithms if not NULL */
3674 if (!s->server && c->client_sigalgs && !is_suiteb) {
3675 conf = c->client_sigalgs;
3676 conflen = c->client_sigalgslen;
3677 } else if (c->conf_sigalgs && !is_suiteb) {
3678 conf = c->conf_sigalgs;
3679 conflen = c->conf_sigalgslen;
3681 conflen = tls12_get_psigalgs(s, &conf);
3682 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
3685 allow = s->s3->tmp.peer_sigalgs;
3686 allowlen = s->s3->tmp.peer_sigalgslen;
3690 pref = s->s3->tmp.peer_sigalgs;
3691 preflen = s->s3->tmp.peer_sigalgslen;
3693 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
3695 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3698 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
3702 c->shared_sigalgs = salgs;
3703 c->shared_sigalgslen = nmatch;
3707 /* Set preferred digest for each key type */
3709 int tls1_save_sigalgs(SSL *s, const unsigned char *data, size_t dsize)
3712 /* Extension ignored for inappropriate versions */
3713 if (!SSL_USE_SIGALGS(s))
3715 /* Should never happen */
3719 OPENSSL_free(s->s3->tmp.peer_sigalgs);
3720 s->s3->tmp.peer_sigalgs = OPENSSL_malloc(dsize);
3721 if (s->s3->tmp.peer_sigalgs == NULL)
3723 s->s3->tmp.peer_sigalgslen = dsize;
3724 memcpy(s->s3->tmp.peer_sigalgs, data, dsize);
3728 int tls1_process_sigalgs(SSL *s)
3733 const EVP_MD **pmd = s->s3->tmp.md;
3734 uint32_t *pvalid = s->s3->tmp.valid_flags;
3736 TLS_SIGALGS *sigptr;
3737 if (!tls1_set_shared_sigalgs(s))
3740 for (i = 0, sigptr = c->shared_sigalgs;
3741 i < c->shared_sigalgslen; i++, sigptr++) {
3742 idx = tls12_get_pkey_idx(sigptr->rsign);
3743 if (idx > 0 && pmd[idx] == NULL) {
3744 md = tls12_get_hash(sigptr->rhash);
3746 pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN;
3747 if (idx == SSL_PKEY_RSA_SIGN) {
3748 pvalid[SSL_PKEY_RSA_ENC] = CERT_PKEY_EXPLICIT_SIGN;
3749 pmd[SSL_PKEY_RSA_ENC] = md;
3755 * In strict mode leave unset digests as NULL to indicate we can't use
3756 * the certificate for signing.
3758 if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
3760 * Set any remaining keys to default values. NOTE: if alg is not
3761 * supported it stays as NULL.
3763 #ifndef OPENSSL_NO_DSA
3764 if (pmd[SSL_PKEY_DSA_SIGN] == NULL)
3765 pmd[SSL_PKEY_DSA_SIGN] = EVP_sha1();
3767 #ifndef OPENSSL_NO_RSA
3768 if (pmd[SSL_PKEY_RSA_SIGN] == NULL) {
3769 pmd[SSL_PKEY_RSA_SIGN] = EVP_sha1();
3770 pmd[SSL_PKEY_RSA_ENC] = EVP_sha1();
3773 #ifndef OPENSSL_NO_EC
3774 if (pmd[SSL_PKEY_ECC] == NULL)
3775 pmd[SSL_PKEY_ECC] = EVP_sha1();
3777 #ifndef OPENSSL_NO_GOST
3778 if (pmd[SSL_PKEY_GOST01] == NULL)
3779 pmd[SSL_PKEY_GOST01] = EVP_get_digestbynid(NID_id_GostR3411_94);
3780 if (pmd[SSL_PKEY_GOST12_256] == NULL)
3781 pmd[SSL_PKEY_GOST12_256] =
3782 EVP_get_digestbynid(NID_id_GostR3411_2012_256);
3783 if (pmd[SSL_PKEY_GOST12_512] == NULL)
3784 pmd[SSL_PKEY_GOST12_512] =
3785 EVP_get_digestbynid(NID_id_GostR3411_2012_512);
3791 int SSL_get_sigalgs(SSL *s, int idx,
3792 int *psign, int *phash, int *psignhash,
3793 unsigned char *rsig, unsigned char *rhash)
3795 const unsigned char *psig = s->s3->tmp.peer_sigalgs;
3796 size_t numsigalgs = s->s3->tmp.peer_sigalgslen / 2;
3797 if (psig == NULL || numsigalgs > INT_MAX)
3801 if (idx >= (int)s->s3->tmp.peer_sigalgslen)
3808 tls1_lookup_sigalg(phash, psign, psignhash, psig);
3810 return (int)numsigalgs;
3813 int SSL_get_shared_sigalgs(SSL *s, int idx,
3814 int *psign, int *phash, int *psignhash,
3815 unsigned char *rsig, unsigned char *rhash)
3817 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3818 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen
3819 || s->cert->shared_sigalgslen > INT_MAX)
3823 *phash = shsigalgs->hash_nid;
3825 *psign = shsigalgs->sign_nid;
3827 *psignhash = shsigalgs->signandhash_nid;
3829 *rsig = shsigalgs->rsign;
3831 *rhash = shsigalgs->rhash;
3832 return (int)s->cert->shared_sigalgslen;
3835 #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
3839 int sigalgs[MAX_SIGALGLEN];
3842 static void get_sigorhash(int *psig, int *phash, const char *str)
3844 if (strcmp(str, "RSA") == 0) {
3845 *psig = EVP_PKEY_RSA;
3846 } else if (strcmp(str, "DSA") == 0) {
3847 *psig = EVP_PKEY_DSA;
3848 } else if (strcmp(str, "ECDSA") == 0) {
3849 *psig = EVP_PKEY_EC;
3851 *phash = OBJ_sn2nid(str);
3852 if (*phash == NID_undef)
3853 *phash = OBJ_ln2nid(str);
3857 static int sig_cb(const char *elem, int len, void *arg)
3859 sig_cb_st *sarg = arg;
3862 int sig_alg = NID_undef, hash_alg = NID_undef;
3865 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3867 if (len > (int)(sizeof(etmp) - 1))
3869 memcpy(etmp, elem, len);
3871 p = strchr(etmp, '+');
3879 get_sigorhash(&sig_alg, &hash_alg, etmp);
3880 get_sigorhash(&sig_alg, &hash_alg, p);
3882 if (sig_alg == NID_undef || hash_alg == NID_undef)
3885 for (i = 0; i < sarg->sigalgcnt; i += 2) {
3886 if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg)
3889 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3890 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3895 * Set supported signature algorithms based on a colon separated list of the
3896 * form sig+hash e.g. RSA+SHA512:DSA+SHA512
3898 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
3902 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3906 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
3909 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
3911 unsigned char *sigalgs, *sptr;
3916 sigalgs = OPENSSL_malloc(salglen);
3917 if (sigalgs == NULL)
3919 for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
3920 rhash = tls12_find_id(*psig_nids++, tls12_md, OSSL_NELEM(tls12_md));
3921 rsign = tls12_find_id(*psig_nids++, tls12_sig, OSSL_NELEM(tls12_sig));
3923 if (rhash == -1 || rsign == -1)
3930 OPENSSL_free(c->client_sigalgs);
3931 c->client_sigalgs = sigalgs;
3932 c->client_sigalgslen = salglen;
3934 OPENSSL_free(c->conf_sigalgs);
3935 c->conf_sigalgs = sigalgs;
3936 c->conf_sigalgslen = salglen;
3942 OPENSSL_free(sigalgs);
3946 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
3950 if (default_nid == -1)
3952 sig_nid = X509_get_signature_nid(x);
3954 return sig_nid == default_nid ? 1 : 0;
3955 for (i = 0; i < c->shared_sigalgslen; i++)
3956 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
3961 /* Check to see if a certificate issuer name matches list of CA names */
3962 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
3966 nm = X509_get_issuer_name(x);
3967 for (i = 0; i < sk_X509_NAME_num(names); i++) {
3968 if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
3975 * Check certificate chain is consistent with TLS extensions and is usable by
3976 * server. This servers two purposes: it allows users to check chains before
3977 * passing them to the server and it allows the server to check chains before
3978 * attempting to use them.
3981 /* Flags which need to be set for a certificate when stict mode not set */
3983 #define CERT_PKEY_VALID_FLAGS \
3984 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
3985 /* Strict mode flags */
3986 #define CERT_PKEY_STRICT_FLAGS \
3987 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
3988 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
3990 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
3995 int check_flags = 0, strict_mode;
3996 CERT_PKEY *cpk = NULL;
3999 unsigned int suiteb_flags = tls1_suiteb(s);
4000 /* idx == -1 means checking server chains */
4002 /* idx == -2 means checking client certificate chains */
4005 idx = (int)(cpk - c->pkeys);
4007 cpk = c->pkeys + idx;
4008 pvalid = s->s3->tmp.valid_flags + idx;
4010 pk = cpk->privatekey;
4012 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
4013 /* If no cert or key, forget it */
4019 idx = ssl_cert_type(x, pk);
4022 pvalid = s->s3->tmp.valid_flags + idx;
4024 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
4025 check_flags = CERT_PKEY_STRICT_FLAGS;
4027 check_flags = CERT_PKEY_VALID_FLAGS;
4034 check_flags |= CERT_PKEY_SUITEB;
4035 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
4036 if (ok == X509_V_OK)
4037 rv |= CERT_PKEY_SUITEB;
4038 else if (!check_flags)
4043 * Check all signature algorithms are consistent with signature
4044 * algorithms extension if TLS 1.2 or later and strict mode.
4046 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
4048 unsigned char rsign = 0;
4049 if (s->s3->tmp.peer_sigalgs)
4051 /* If no sigalgs extension use defaults from RFC5246 */
4054 case SSL_PKEY_RSA_ENC:
4055 case SSL_PKEY_RSA_SIGN:
4056 rsign = TLSEXT_signature_rsa;
4057 default_nid = NID_sha1WithRSAEncryption;
4060 case SSL_PKEY_DSA_SIGN:
4061 rsign = TLSEXT_signature_dsa;
4062 default_nid = NID_dsaWithSHA1;
4066 rsign = TLSEXT_signature_ecdsa;
4067 default_nid = NID_ecdsa_with_SHA1;
4070 case SSL_PKEY_GOST01:
4071 rsign = TLSEXT_signature_gostr34102001;
4072 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
4075 case SSL_PKEY_GOST12_256:
4076 rsign = TLSEXT_signature_gostr34102012_256;
4077 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
4080 case SSL_PKEY_GOST12_512:
4081 rsign = TLSEXT_signature_gostr34102012_512;
4082 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
4091 * If peer sent no signature algorithms extension and we have set
4092 * preferred signature algorithms check we support sha1.
4094 if (default_nid > 0 && c->conf_sigalgs) {
4096 const unsigned char *p = c->conf_sigalgs;
4097 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2) {
4098 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4101 if (j == c->conf_sigalgslen) {
4108 /* Check signature algorithm of each cert in chain */
4109 if (!tls1_check_sig_alg(c, x, default_nid)) {
4113 rv |= CERT_PKEY_EE_SIGNATURE;
4114 rv |= CERT_PKEY_CA_SIGNATURE;
4115 for (i = 0; i < sk_X509_num(chain); i++) {
4116 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
4118 rv &= ~CERT_PKEY_CA_SIGNATURE;
4125 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4126 else if (check_flags)
4127 rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
4129 /* Check cert parameters are consistent */
4130 if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
4131 rv |= CERT_PKEY_EE_PARAM;
4132 else if (!check_flags)
4135 rv |= CERT_PKEY_CA_PARAM;
4136 /* In strict mode check rest of chain too */
4137 else if (strict_mode) {
4138 rv |= CERT_PKEY_CA_PARAM;
4139 for (i = 0; i < sk_X509_num(chain); i++) {
4140 X509 *ca = sk_X509_value(chain, i);
4141 if (!tls1_check_cert_param(s, ca, 0)) {
4143 rv &= ~CERT_PKEY_CA_PARAM;
4150 if (!s->server && strict_mode) {
4151 STACK_OF(X509_NAME) *ca_dn;
4153 switch (EVP_PKEY_id(pk)) {
4155 check_type = TLS_CT_RSA_SIGN;
4158 check_type = TLS_CT_DSS_SIGN;
4161 check_type = TLS_CT_ECDSA_SIGN;
4165 const unsigned char *ctypes;
4169 ctypelen = (int)c->ctype_num;
4171 ctypes = (unsigned char *)s->s3->tmp.ctype;
4172 ctypelen = s->s3->tmp.ctype_num;
4174 for (i = 0; i < ctypelen; i++) {
4175 if (ctypes[i] == check_type) {
4176 rv |= CERT_PKEY_CERT_TYPE;
4180 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
4183 rv |= CERT_PKEY_CERT_TYPE;
4185 ca_dn = s->s3->tmp.ca_names;
4187 if (!sk_X509_NAME_num(ca_dn))
4188 rv |= CERT_PKEY_ISSUER_NAME;
4190 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
4191 if (ssl_check_ca_name(ca_dn, x))
4192 rv |= CERT_PKEY_ISSUER_NAME;
4194 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
4195 for (i = 0; i < sk_X509_num(chain); i++) {
4196 X509 *xtmp = sk_X509_value(chain, i);
4197 if (ssl_check_ca_name(ca_dn, xtmp)) {
4198 rv |= CERT_PKEY_ISSUER_NAME;
4203 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4206 rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
4208 if (!check_flags || (rv & check_flags) == check_flags)
4209 rv |= CERT_PKEY_VALID;
4213 if (TLS1_get_version(s) >= TLS1_2_VERSION) {
4214 if (*pvalid & CERT_PKEY_EXPLICIT_SIGN)
4215 rv |= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
4216 else if (s->s3->tmp.md[idx] != NULL)
4217 rv |= CERT_PKEY_SIGN;
4219 rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
4222 * When checking a CERT_PKEY structure all flags are irrelevant if the
4226 if (rv & CERT_PKEY_VALID)
4229 /* Preserve explicit sign flag, clear rest */
4230 *pvalid &= CERT_PKEY_EXPLICIT_SIGN;
4237 /* Set validity of certificates in an SSL structure */
4238 void tls1_set_cert_validity(SSL *s)
4240 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4241 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4242 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4243 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4244 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
4245 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
4246 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
4249 /* User level utiity function to check a chain is suitable */
4250 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4252 return tls1_check_chain(s, x, pk, chain, -1);
4255 #ifndef OPENSSL_NO_DH
4256 DH *ssl_get_auto_dh(SSL *s)
4258 int dh_secbits = 80;
4259 if (s->cert->dh_tmp_auto == 2)
4260 return DH_get_1024_160();
4261 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
4262 if (s->s3->tmp.new_cipher->strength_bits == 256)
4267 CERT_PKEY *cpk = ssl_get_server_send_pkey(s);
4268 dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
4271 if (dh_secbits >= 128) {
4279 if (dh_secbits >= 192)
4280 p = BN_get_rfc3526_prime_8192(NULL);
4282 p = BN_get_rfc3526_prime_3072(NULL);
4283 if (p == NULL || g == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
4291 if (dh_secbits >= 112)
4292 return DH_get_2048_224();
4293 return DH_get_1024_160();
4297 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4300 EVP_PKEY *pkey = X509_get0_pubkey(x);
4303 * If no parameters this will return -1 and fail using the default
4304 * security callback for any non-zero security level. This will
4305 * reject keys which omit parameters but this only affects DSA and
4306 * omission of parameters is never (?) done in practice.
4308 secbits = EVP_PKEY_security_bits(pkey);
4311 return ssl_security(s, op, secbits, 0, x);
4313 return ssl_ctx_security(ctx, op, secbits, 0, x);
4316 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4318 /* Lookup signature algorithm digest */
4319 int secbits = -1, md_nid = NID_undef, sig_nid;
4320 /* Don't check signature if self signed */
4321 if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
4323 sig_nid = X509_get_signature_nid(x);
4324 if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL)) {
4326 if (md_nid && (md = EVP_get_digestbynid(md_nid)))
4327 secbits = EVP_MD_size(md) * 4;
4330 return ssl_security(s, op, secbits, md_nid, x);
4332 return ssl_ctx_security(ctx, op, secbits, md_nid, x);
4335 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
4338 vfy = SSL_SECOP_PEER;
4340 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
4341 return SSL_R_EE_KEY_TOO_SMALL;
4343 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
4344 return SSL_R_CA_KEY_TOO_SMALL;
4346 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
4347 return SSL_R_CA_MD_TOO_WEAK;
4352 * Check security of a chain, if sk includes the end entity certificate then
4353 * x is NULL. If vfy is 1 then we are verifying a peer chain and not sending
4354 * one to the peer. Return values: 1 if ok otherwise error code to use
4357 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
4359 int rv, start_idx, i;
4361 x = sk_X509_value(sk, 0);
4366 rv = ssl_security_cert(s, NULL, x, vfy, 1);
4370 for (i = start_idx; i < sk_X509_num(sk); i++) {
4371 x = sk_X509_value(sk, i);
4372 rv = ssl_security_cert(s, NULL, x, vfy, 0);