2 * Copyright 1995-2018 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>
20 #include "internal/nelem.h"
22 #include <openssl/ct.h>
24 SSL3_ENC_METHOD const TLSv1_enc_data = {
28 tls1_generate_master_secret,
29 tls1_change_cipher_state,
30 tls1_final_finish_mac,
31 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
32 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
34 tls1_export_keying_material,
36 ssl3_set_handshake_header,
37 tls_close_construct_packet,
41 SSL3_ENC_METHOD const TLSv1_1_enc_data = {
45 tls1_generate_master_secret,
46 tls1_change_cipher_state,
47 tls1_final_finish_mac,
48 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
49 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
51 tls1_export_keying_material,
52 SSL_ENC_FLAG_EXPLICIT_IV,
53 ssl3_set_handshake_header,
54 tls_close_construct_packet,
58 SSL3_ENC_METHOD const TLSv1_2_enc_data = {
62 tls1_generate_master_secret,
63 tls1_change_cipher_state,
64 tls1_final_finish_mac,
65 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
66 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
68 tls1_export_keying_material,
69 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
70 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
71 ssl3_set_handshake_header,
72 tls_close_construct_packet,
76 SSL3_ENC_METHOD const TLSv1_3_enc_data = {
79 tls13_setup_key_block,
80 tls13_generate_master_secret,
81 tls13_change_cipher_state,
82 tls13_final_finish_mac,
83 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
84 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
86 tls13_export_keying_material,
87 SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
88 ssl3_set_handshake_header,
89 tls_close_construct_packet,
93 long tls1_default_timeout(void)
96 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
97 * http, the cache would over fill
106 if (!s->method->ssl_clear(s))
112 void tls1_free(SSL *s)
114 OPENSSL_free(s->ext.session_ticket);
118 int tls1_clear(SSL *s)
123 if (s->method->version == TLS_ANY_VERSION)
124 s->version = TLS_MAX_VERSION;
126 s->version = s->method->version;
131 #ifndef OPENSSL_NO_EC
134 * Table of curve information.
135 * Do not delete entries or reorder this array! It is used as a lookup
136 * table: the index of each entry is one less than the TLS curve id.
138 static const TLS_GROUP_INFO nid_list[] = {
139 {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
140 {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
141 {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
142 {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
143 {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
144 {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
145 {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
146 {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
147 {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
148 {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
149 {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
150 {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
151 {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
152 {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
153 {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
154 {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
155 {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
156 {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
157 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
158 {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
159 {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
160 {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
161 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
162 {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
163 {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
164 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
165 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
166 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
167 {EVP_PKEY_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
168 {EVP_PKEY_X448, 224, TLS_CURVE_CUSTOM}, /* X448 (30) */
171 static const unsigned char ecformats_default[] = {
172 TLSEXT_ECPOINTFORMAT_uncompressed,
173 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
174 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
177 /* The default curves */
178 static const uint16_t eccurves_default[] = {
179 29, /* X25519 (29) */
180 23, /* secp256r1 (23) */
182 25, /* secp521r1 (25) */
183 24, /* secp384r1 (24) */
186 static const uint16_t suiteb_curves[] = {
191 const TLS_GROUP_INFO *tls1_group_id_lookup(uint16_t group_id)
193 /* ECC curves from RFC 4492 and RFC 7027 */
194 if (group_id < 1 || group_id > OSSL_NELEM(nid_list))
196 return &nid_list[group_id - 1];
199 static uint16_t tls1_nid2group_id(int nid)
202 for (i = 0; i < OSSL_NELEM(nid_list); i++) {
203 if (nid_list[i].nid == nid)
204 return (uint16_t)(i + 1);
210 * Set *pgroups to the supported groups list and *pgroupslen to
211 * the number of groups supported.
213 void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
217 /* For Suite B mode only include P-256, P-384 */
218 switch (tls1_suiteb(s)) {
219 case SSL_CERT_FLAG_SUITEB_128_LOS:
220 *pgroups = suiteb_curves;
221 *pgroupslen = OSSL_NELEM(suiteb_curves);
224 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
225 *pgroups = suiteb_curves;
229 case SSL_CERT_FLAG_SUITEB_192_LOS:
230 *pgroups = suiteb_curves + 1;
235 if (s->ext.supportedgroups == NULL) {
236 *pgroups = eccurves_default;
237 *pgroupslen = OSSL_NELEM(eccurves_default);
239 *pgroups = s->ext.supportedgroups;
240 *pgroupslen = s->ext.supportedgroups_len;
246 /* See if curve is allowed by security callback */
247 int tls_curve_allowed(SSL *s, uint16_t curve, int op)
249 const TLS_GROUP_INFO *cinfo = tls1_group_id_lookup(curve);
250 unsigned char ctmp[2];
254 # ifdef OPENSSL_NO_EC2M
255 if (cinfo->flags & TLS_CURVE_CHAR2)
258 ctmp[0] = curve >> 8;
259 ctmp[1] = curve & 0xff;
260 return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)ctmp);
263 /* Return 1 if "id" is in "list" */
264 static int tls1_in_list(uint16_t id, const uint16_t *list, size_t listlen)
267 for (i = 0; i < listlen; i++)
274 * For nmatch >= 0, return the id of the |nmatch|th shared group or 0
275 * if there is no match.
276 * For nmatch == -1, return number of matches
277 * For nmatch == -2, return the id of the group to use for
278 * a tmp key, or 0 if there is no match.
280 uint16_t tls1_shared_group(SSL *s, int nmatch)
282 const uint16_t *pref, *supp;
283 size_t num_pref, num_supp, i;
286 /* Can't do anything on client side */
290 if (tls1_suiteb(s)) {
292 * For Suite B ciphersuite determines curve: we already know
293 * these are acceptable due to previous checks.
295 unsigned long cid = s->s3->tmp.new_cipher->id;
297 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
298 return TLSEXT_curve_P_256;
299 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
300 return TLSEXT_curve_P_384;
301 /* Should never happen */
304 /* If not Suite B just return first preference shared curve */
308 * If server preference set, our groups are the preference order
309 * otherwise peer decides.
311 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
312 tls1_get_supported_groups(s, &pref, &num_pref);
313 tls1_get_peer_groups(s, &supp, &num_supp);
315 tls1_get_peer_groups(s, &pref, &num_pref);
316 tls1_get_supported_groups(s, &supp, &num_supp);
319 for (k = 0, i = 0; i < num_pref; i++) {
320 uint16_t id = pref[i];
322 if (!tls1_in_list(id, supp, num_supp)
323 || !tls_curve_allowed(s, id, SSL_SECOP_CURVE_SHARED))
331 /* Out of range (nmatch > k). */
335 int tls1_set_groups(uint16_t **pext, size_t *pextlen,
336 int *groups, size_t ngroups)
341 * Bitmap of groups included to detect duplicates: only works while group
344 unsigned long dup_list = 0;
345 glist = OPENSSL_malloc(ngroups * sizeof(*glist));
348 for (i = 0; i < ngroups; i++) {
349 unsigned long idmask;
351 /* TODO(TLS1.3): Convert for DH groups */
352 id = tls1_nid2group_id(groups[i]);
354 if (!id || (dup_list & idmask)) {
367 # define MAX_CURVELIST 28
371 int nid_arr[MAX_CURVELIST];
374 static int nid_cb(const char *elem, int len, void *arg)
376 nid_cb_st *narg = arg;
382 if (narg->nidcnt == MAX_CURVELIST)
384 if (len > (int)(sizeof(etmp) - 1))
386 memcpy(etmp, elem, len);
388 nid = EC_curve_nist2nid(etmp);
389 if (nid == NID_undef)
390 nid = OBJ_sn2nid(etmp);
391 if (nid == NID_undef)
392 nid = OBJ_ln2nid(etmp);
393 if (nid == NID_undef)
395 for (i = 0; i < narg->nidcnt; i++)
396 if (narg->nid_arr[i] == nid)
398 narg->nid_arr[narg->nidcnt++] = nid;
402 /* Set groups based on a colon separate list */
403 int tls1_set_groups_list(uint16_t **pext, size_t *pextlen, const char *str)
407 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
411 return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
413 /* Return group id of a key */
414 static uint16_t tls1_get_group_id(EVP_PKEY *pkey)
416 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
421 grp = EC_KEY_get0_group(ec);
422 return tls1_nid2group_id(EC_GROUP_get_curve_name(grp));
425 /* Check a key is compatible with compression extension */
426 static int tls1_check_pkey_comp(SSL *s, EVP_PKEY *pkey)
430 unsigned char comp_id;
433 /* If not an EC key nothing to check */
434 if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
436 ec = EVP_PKEY_get0_EC_KEY(pkey);
437 grp = EC_KEY_get0_group(ec);
439 /* Get required compression id */
440 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
441 comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
442 } else if (SSL_IS_TLS13(s)) {
443 /* Compression not allowed in TLS 1.3 */
446 int field_type = EC_METHOD_get_field_type(EC_GROUP_method_of(grp));
448 if (field_type == NID_X9_62_prime_field)
449 comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
450 else if (field_type == NID_X9_62_characteristic_two_field)
451 comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
456 * If point formats extension present check it, otherwise everything is
457 * supported (see RFC4492).
459 if (s->session->ext.ecpointformats == NULL)
462 for (i = 0; i < s->session->ext.ecpointformats_len; i++) {
463 if (s->session->ext.ecpointformats[i] == comp_id)
469 /* Check a group id matches preferences */
470 int tls1_check_group_id(SSL *s, uint16_t group_id, int check_own_groups)
472 const uint16_t *groups;
478 /* Check for Suite B compliance */
479 if (tls1_suiteb(s) && s->s3->tmp.new_cipher != NULL) {
480 unsigned long cid = s->s3->tmp.new_cipher->id;
482 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
483 if (group_id != TLSEXT_curve_P_256)
485 } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
486 if (group_id != TLSEXT_curve_P_384)
489 /* Should never happen */
494 if (check_own_groups) {
495 /* Check group is one of our preferences */
496 tls1_get_supported_groups(s, &groups, &groups_len);
497 if (!tls1_in_list(group_id, groups, groups_len))
501 if (!tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_CHECK))
504 /* For clients, nothing more to check */
508 /* Check group is one of peers preferences */
509 tls1_get_peer_groups(s, &groups, &groups_len);
512 * RFC 4492 does not require the supported elliptic curves extension
513 * so if it is not sent we can just choose any curve.
514 * It is invalid to send an empty list in the supported groups
515 * extension, so groups_len == 0 always means no extension.
519 return tls1_in_list(group_id, groups, groups_len);
522 void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
526 * If we have a custom point format list use it otherwise use default
528 if (s->ext.ecpointformats) {
529 *pformats = s->ext.ecpointformats;
530 *num_formats = s->ext.ecpointformats_len;
532 *pformats = ecformats_default;
533 /* For Suite B we don't support char2 fields */
535 *num_formats = sizeof(ecformats_default) - 1;
537 *num_formats = sizeof(ecformats_default);
542 * Check cert parameters compatible with extensions: currently just checks EC
543 * certificates have compatible curves and compression.
545 static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
549 pkey = X509_get0_pubkey(x);
552 /* If not EC nothing to do */
553 if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
555 /* Check compression */
556 if (!tls1_check_pkey_comp(s, pkey))
558 group_id = tls1_get_group_id(pkey);
560 * For a server we allow the certificate to not be in our list of supported
563 if (!tls1_check_group_id(s, group_id, !s->server))
566 * Special case for suite B. We *MUST* sign using SHA256+P-256 or
569 if (check_ee_md && tls1_suiteb(s)) {
574 /* Check to see we have necessary signing algorithm */
575 if (group_id == TLSEXT_curve_P_256)
576 check_md = NID_ecdsa_with_SHA256;
577 else if (group_id == TLSEXT_curve_P_384)
578 check_md = NID_ecdsa_with_SHA384;
580 return 0; /* Should never happen */
581 for (i = 0; i < c->shared_sigalgslen; i++) {
582 if (check_md == c->shared_sigalgs[i]->sigandhash)
591 * tls1_check_ec_tmp_key - Check EC temporary key compatibility
593 * @cid: Cipher ID we're considering using
595 * Checks that the kECDHE cipher suite we're considering using
596 * is compatible with the client extensions.
598 * Returns 0 when the cipher can't be used or 1 when it can.
600 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
602 /* If not Suite B just need a shared group */
604 return tls1_shared_group(s, 0) != 0;
606 * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
609 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
610 return tls1_check_group_id(s, TLSEXT_curve_P_256, 1);
611 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
612 return tls1_check_group_id(s, TLSEXT_curve_P_384, 1);
619 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
624 #endif /* OPENSSL_NO_EC */
626 /* Default sigalg schemes */
627 static const uint16_t tls12_sigalgs[] = {
628 #ifndef OPENSSL_NO_EC
629 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
630 TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
631 TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
632 TLSEXT_SIGALG_ed25519,
636 TLSEXT_SIGALG_rsa_pss_pss_sha256,
637 TLSEXT_SIGALG_rsa_pss_pss_sha384,
638 TLSEXT_SIGALG_rsa_pss_pss_sha512,
639 TLSEXT_SIGALG_rsa_pss_rsae_sha256,
640 TLSEXT_SIGALG_rsa_pss_rsae_sha384,
641 TLSEXT_SIGALG_rsa_pss_rsae_sha512,
643 TLSEXT_SIGALG_rsa_pkcs1_sha256,
644 TLSEXT_SIGALG_rsa_pkcs1_sha384,
645 TLSEXT_SIGALG_rsa_pkcs1_sha512,
647 #ifndef OPENSSL_NO_EC
648 TLSEXT_SIGALG_ecdsa_sha224,
649 TLSEXT_SIGALG_ecdsa_sha1,
651 TLSEXT_SIGALG_rsa_pkcs1_sha224,
652 TLSEXT_SIGALG_rsa_pkcs1_sha1,
653 #ifndef OPENSSL_NO_DSA
654 TLSEXT_SIGALG_dsa_sha224,
655 TLSEXT_SIGALG_dsa_sha1,
657 TLSEXT_SIGALG_dsa_sha256,
658 TLSEXT_SIGALG_dsa_sha384,
659 TLSEXT_SIGALG_dsa_sha512
663 #ifndef OPENSSL_NO_EC
664 static const uint16_t suiteb_sigalgs[] = {
665 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
666 TLSEXT_SIGALG_ecdsa_secp384r1_sha384
670 static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
671 #ifndef OPENSSL_NO_EC
672 {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
673 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
674 NID_ecdsa_with_SHA256, NID_X9_62_prime256v1},
675 {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
676 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
677 NID_ecdsa_with_SHA384, NID_secp384r1},
678 {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
679 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
680 NID_ecdsa_with_SHA512, NID_secp521r1},
681 {"ed25519", TLSEXT_SIGALG_ed25519,
682 NID_undef, -1, EVP_PKEY_ED25519, SSL_PKEY_ED25519,
683 NID_undef, NID_undef},
684 {"ed448", TLSEXT_SIGALG_ed448,
685 NID_undef, -1, EVP_PKEY_ED448, SSL_PKEY_ED448,
686 NID_undef, NID_undef},
687 {NULL, TLSEXT_SIGALG_ecdsa_sha224,
688 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
689 NID_ecdsa_with_SHA224, NID_undef},
690 {NULL, TLSEXT_SIGALG_ecdsa_sha1,
691 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
692 NID_ecdsa_with_SHA1, NID_undef},
694 {"rsa_pss_rsae_sha256", TLSEXT_SIGALG_rsa_pss_rsae_sha256,
695 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
696 NID_undef, NID_undef},
697 {"rsa_pss_rsae_sha384", TLSEXT_SIGALG_rsa_pss_rsae_sha384,
698 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
699 NID_undef, NID_undef},
700 {"rsa_pss_rsae_sha512", TLSEXT_SIGALG_rsa_pss_rsae_sha512,
701 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
702 NID_undef, NID_undef},
703 {"rsa_pss_pss_sha256", TLSEXT_SIGALG_rsa_pss_pss_sha256,
704 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
705 NID_undef, NID_undef},
706 {"rsa_pss_pss_sha384", TLSEXT_SIGALG_rsa_pss_pss_sha384,
707 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
708 NID_undef, NID_undef},
709 {"rsa_pss_pss_sha512", TLSEXT_SIGALG_rsa_pss_pss_sha512,
710 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
711 NID_undef, NID_undef},
712 {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
713 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
714 NID_sha256WithRSAEncryption, NID_undef},
715 {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
716 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
717 NID_sha384WithRSAEncryption, NID_undef},
718 {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
719 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
720 NID_sha512WithRSAEncryption, NID_undef},
721 {"rsa_pkcs1_sha224", TLSEXT_SIGALG_rsa_pkcs1_sha224,
722 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
723 NID_sha224WithRSAEncryption, NID_undef},
724 {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
725 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
726 NID_sha1WithRSAEncryption, NID_undef},
727 #ifndef OPENSSL_NO_DSA
728 {NULL, TLSEXT_SIGALG_dsa_sha256,
729 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
730 NID_dsa_with_SHA256, NID_undef},
731 {NULL, TLSEXT_SIGALG_dsa_sha384,
732 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
733 NID_undef, NID_undef},
734 {NULL, TLSEXT_SIGALG_dsa_sha512,
735 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
736 NID_undef, NID_undef},
737 {NULL, TLSEXT_SIGALG_dsa_sha224,
738 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
739 NID_undef, NID_undef},
740 {NULL, TLSEXT_SIGALG_dsa_sha1,
741 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
742 NID_dsaWithSHA1, NID_undef},
744 #ifndef OPENSSL_NO_GOST
745 {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
746 NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
747 NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
748 NID_undef, NID_undef},
749 {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
750 NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
751 NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
752 NID_undef, NID_undef},
753 {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
754 NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
755 NID_id_GostR3410_2001, SSL_PKEY_GOST01,
756 NID_undef, NID_undef}
759 /* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
760 static const SIGALG_LOOKUP legacy_rsa_sigalg = {
761 "rsa_pkcs1_md5_sha1", 0,
762 NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
763 EVP_PKEY_RSA, SSL_PKEY_RSA,
768 * Default signature algorithm values used if signature algorithms not present.
769 * From RFC5246. Note: order must match certificate index order.
771 static const uint16_t tls_default_sigalg[] = {
772 TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
773 0, /* SSL_PKEY_RSA_PSS_SIGN */
774 TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
775 TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
776 TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
777 TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256, /* SSL_PKEY_GOST12_256 */
778 TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512, /* SSL_PKEY_GOST12_512 */
779 0, /* SSL_PKEY_ED25519 */
780 0, /* SSL_PKEY_ED448 */
783 /* Lookup TLS signature algorithm */
784 static const SIGALG_LOOKUP *tls1_lookup_sigalg(uint16_t sigalg)
787 const SIGALG_LOOKUP *s;
789 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
791 if (s->sigalg == sigalg)
796 /* Lookup hash: return 0 if invalid or not enabled */
797 int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd)
802 /* lu->hash == NID_undef means no associated digest */
803 if (lu->hash == NID_undef) {
806 md = ssl_md(lu->hash_idx);
816 * Check if key is large enough to generate RSA-PSS signature.
818 * The key must greater than or equal to 2 * hash length + 2.
819 * SHA512 has a hash length of 64 bytes, which is incompatible
820 * with a 128 byte (1024 bit) key.
822 #define RSA_PSS_MINIMUM_KEY_SIZE(md) (2 * EVP_MD_size(md) + 2)
823 static int rsa_pss_check_min_key_size(const RSA *rsa, const SIGALG_LOOKUP *lu)
829 if (!tls1_lookup_md(lu, &md) || md == NULL)
831 if (RSA_size(rsa) < RSA_PSS_MINIMUM_KEY_SIZE(md))
837 * Return a signature algorithm for TLS < 1.2 where the signature type
838 * is fixed by the certificate type.
840 static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
846 /* Work out index corresponding to ciphersuite */
847 for (i = 0; i < SSL_PKEY_NUM; i++) {
848 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(i);
850 if (clu->amask & s->s3->tmp.new_cipher->algorithm_auth) {
856 idx = s->cert->key - s->cert->pkeys;
859 if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
861 if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
862 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(tls_default_sigalg[idx]);
864 if (!tls1_lookup_md(lu, NULL))
868 return &legacy_rsa_sigalg;
870 /* Set peer sigalg based key type */
871 int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
874 const SIGALG_LOOKUP *lu;
876 if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
878 lu = tls1_get_legacy_sigalg(s, idx);
881 s->s3->tmp.peer_sigalg = lu;
885 size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
888 * If Suite B mode use Suite B sigalgs only, ignore any other
891 #ifndef OPENSSL_NO_EC
892 switch (tls1_suiteb(s)) {
893 case SSL_CERT_FLAG_SUITEB_128_LOS:
894 *psigs = suiteb_sigalgs;
895 return OSSL_NELEM(suiteb_sigalgs);
897 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
898 *psigs = suiteb_sigalgs;
901 case SSL_CERT_FLAG_SUITEB_192_LOS:
902 *psigs = suiteb_sigalgs + 1;
907 * We use client_sigalgs (if not NULL) if we're a server
908 * and sending a certificate request or if we're a client and
909 * determining which shared algorithm to use.
911 if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
912 *psigs = s->cert->client_sigalgs;
913 return s->cert->client_sigalgslen;
914 } else if (s->cert->conf_sigalgs) {
915 *psigs = s->cert->conf_sigalgs;
916 return s->cert->conf_sigalgslen;
918 *psigs = tls12_sigalgs;
919 return OSSL_NELEM(tls12_sigalgs);
924 * Check signature algorithm is consistent with sent supported signature
925 * algorithms and if so set relevant digest and signature scheme in
928 int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
930 const uint16_t *sent_sigs;
931 const EVP_MD *md = NULL;
933 size_t sent_sigslen, i;
934 int pkeyid = EVP_PKEY_id(pkey);
935 const SIGALG_LOOKUP *lu;
937 /* Should never happen */
940 if (SSL_IS_TLS13(s)) {
941 /* Disallow DSA for TLS 1.3 */
942 if (pkeyid == EVP_PKEY_DSA) {
943 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
944 SSL_R_WRONG_SIGNATURE_TYPE);
947 /* Only allow PSS for TLS 1.3 */
948 if (pkeyid == EVP_PKEY_RSA)
949 pkeyid = EVP_PKEY_RSA_PSS;
951 lu = tls1_lookup_sigalg(sig);
953 * Check sigalgs is known. Disallow SHA1/SHA224 with TLS 1.3. Check key type
954 * is consistent with signature: RSA keys can be used for RSA-PSS
957 || (SSL_IS_TLS13(s) && (lu->hash == NID_sha1 || lu->hash == NID_sha224))
958 || (pkeyid != lu->sig
959 && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
960 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
961 SSL_R_WRONG_SIGNATURE_TYPE);
964 #ifndef OPENSSL_NO_EC
965 if (pkeyid == EVP_PKEY_EC) {
967 /* Check point compression is permitted */
968 if (!tls1_check_pkey_comp(s, pkey)) {
969 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
970 SSL_F_TLS12_CHECK_PEER_SIGALG,
971 SSL_R_ILLEGAL_POINT_COMPRESSION);
975 /* For TLS 1.3 or Suite B check curve matches signature algorithm */
976 if (SSL_IS_TLS13(s) || tls1_suiteb(s)) {
977 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
978 int curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
980 if (lu->curve != NID_undef && curve != lu->curve) {
981 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
982 SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
986 if (!SSL_IS_TLS13(s)) {
987 /* Check curve matches extensions */
988 if (!tls1_check_group_id(s, tls1_get_group_id(pkey), 1)) {
989 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
990 SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
993 if (tls1_suiteb(s)) {
994 /* Check sigalg matches a permissible Suite B value */
995 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
996 && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
997 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
998 SSL_F_TLS12_CHECK_PEER_SIGALG,
999 SSL_R_WRONG_SIGNATURE_TYPE);
1004 } else if (tls1_suiteb(s)) {
1005 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1006 SSL_R_WRONG_SIGNATURE_TYPE);
1011 /* Check signature matches a type we sent */
1012 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1013 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
1014 if (sig == *sent_sigs)
1017 /* Allow fallback to SHA1 if not strict mode */
1018 if (i == sent_sigslen && (lu->hash != NID_sha1
1019 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
1020 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1021 SSL_R_WRONG_SIGNATURE_TYPE);
1024 if (!tls1_lookup_md(lu, &md)) {
1025 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1026 SSL_R_UNKNOWN_DIGEST);
1031 * Make sure security callback allows algorithm. For historical
1032 * reasons we have to pass the sigalg as a two byte char array.
1034 sigalgstr[0] = (sig >> 8) & 0xff;
1035 sigalgstr[1] = sig & 0xff;
1036 if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
1037 EVP_MD_size(md) * 4, EVP_MD_type(md),
1038 (void *)sigalgstr)) {
1039 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1040 SSL_R_WRONG_SIGNATURE_TYPE);
1044 /* Store the sigalg the peer uses */
1045 s->s3->tmp.peer_sigalg = lu;
1049 int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
1051 if (s->s3->tmp.peer_sigalg == NULL)
1053 *pnid = s->s3->tmp.peer_sigalg->sig;
1058 * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1059 * supported, doesn't appear in supported signature algorithms, isn't supported
1060 * by the enabled protocol versions or by the security level.
1062 * This function should only be used for checking which ciphers are supported
1065 * Call ssl_cipher_disabled() to check that it's enabled or not.
1067 int ssl_set_client_disabled(SSL *s)
1069 s->s3->tmp.mask_a = 0;
1070 s->s3->tmp.mask_k = 0;
1071 ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
1072 if (ssl_get_min_max_version(s, &s->s3->tmp.min_ver,
1073 &s->s3->tmp.max_ver) != 0)
1075 #ifndef OPENSSL_NO_PSK
1076 /* with PSK there must be client callback set */
1077 if (!s->psk_client_callback) {
1078 s->s3->tmp.mask_a |= SSL_aPSK;
1079 s->s3->tmp.mask_k |= SSL_PSK;
1081 #endif /* OPENSSL_NO_PSK */
1082 #ifndef OPENSSL_NO_SRP
1083 if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
1084 s->s3->tmp.mask_a |= SSL_aSRP;
1085 s->s3->tmp.mask_k |= SSL_kSRP;
1092 * ssl_cipher_disabled - check that a cipher is disabled or not
1093 * @s: SSL connection that you want to use the cipher on
1094 * @c: cipher to check
1095 * @op: Security check that you want to do
1096 * @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
1098 * Returns 1 when it's disabled, 0 when enabled.
1100 int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
1102 if (c->algorithm_mkey & s->s3->tmp.mask_k
1103 || c->algorithm_auth & s->s3->tmp.mask_a)
1105 if (s->s3->tmp.max_ver == 0)
1107 if (!SSL_IS_DTLS(s)) {
1108 int min_tls = c->min_tls;
1111 * For historical reasons we will allow ECHDE to be selected by a server
1112 * in SSLv3 if we are a client
1114 if (min_tls == TLS1_VERSION && ecdhe
1115 && (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
1116 min_tls = SSL3_VERSION;
1118 if ((min_tls > s->s3->tmp.max_ver) || (c->max_tls < s->s3->tmp.min_ver))
1121 if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
1122 || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
1125 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1128 int tls_use_ticket(SSL *s)
1130 if ((s->options & SSL_OP_NO_TICKET))
1132 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1135 int tls1_set_server_sigalgs(SSL *s)
1139 /* Clear any shared signature algorithms */
1140 OPENSSL_free(s->cert->shared_sigalgs);
1141 s->cert->shared_sigalgs = NULL;
1142 s->cert->shared_sigalgslen = 0;
1143 /* Clear certificate validity flags */
1144 for (i = 0; i < SSL_PKEY_NUM; i++)
1145 s->s3->tmp.valid_flags[i] = 0;
1147 * If peer sent no signature algorithms check to see if we support
1148 * the default algorithm for each certificate type
1150 if (s->s3->tmp.peer_cert_sigalgs == NULL
1151 && s->s3->tmp.peer_sigalgs == NULL) {
1152 const uint16_t *sent_sigs;
1153 size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1155 for (i = 0; i < SSL_PKEY_NUM; i++) {
1156 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1161 /* Check default matches a type we sent */
1162 for (j = 0; j < sent_sigslen; j++) {
1163 if (lu->sigalg == sent_sigs[j]) {
1164 s->s3->tmp.valid_flags[i] = CERT_PKEY_SIGN;
1172 if (!tls1_process_sigalgs(s)) {
1173 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1174 SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_INTERNAL_ERROR);
1177 if (s->cert->shared_sigalgs != NULL)
1180 /* Fatal error if no shared signature algorithms */
1181 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS1_SET_SERVER_SIGALGS,
1182 SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
1187 * Gets the ticket information supplied by the client if any.
1189 * hello: The parsed ClientHello data
1190 * ret: (output) on return, if a ticket was decrypted, then this is set to
1191 * point to the resulting session.
1193 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
1194 * ciphersuite, in which case we have no use for session tickets and one will
1195 * never be decrypted, nor will s->ext.ticket_expected be set to 1.
1198 * -1: fatal error, either from parsing or decrypting the ticket.
1199 * 0: no ticket was found (or was ignored, based on settings).
1200 * 1: a zero length extension was found, indicating that the client supports
1201 * session tickets but doesn't currently have one to offer.
1202 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
1203 * couldn't be decrypted because of a non-fatal error.
1204 * 3: a ticket was successfully decrypted and *ret was set.
1207 * Sets s->ext.ticket_expected to 1 if the server will have to issue
1208 * a new session ticket to the client because the client indicated support
1209 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
1210 * a session ticket or we couldn't use the one it gave us, or if
1211 * s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1212 * Otherwise, s->ext.ticket_expected is set to 0.
1214 SSL_TICKET_RETURN tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1219 RAW_EXTENSION *ticketext;
1222 s->ext.ticket_expected = 0;
1225 * If tickets disabled or not supported by the protocol version
1226 * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
1229 if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
1230 return SSL_TICKET_NONE;
1232 ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1233 if (!ticketext->present)
1234 return SSL_TICKET_NONE;
1236 size = PACKET_remaining(&ticketext->data);
1239 * The client will accept a ticket but doesn't currently have
1242 s->ext.ticket_expected = 1;
1243 return SSL_TICKET_EMPTY;
1245 if (s->ext.session_secret_cb) {
1247 * Indicate that the ticket couldn't be decrypted rather than
1248 * generating the session from ticket now, trigger
1249 * abbreviated handshake based on external mechanism to
1250 * calculate the master secret later.
1252 return SSL_TICKET_NO_DECRYPT;
1255 retv = tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1256 hello->session_id, hello->session_id_len, ret);
1259 * If set, the decrypt_ticket_cb() is always called regardless of the
1260 * return from tls_decrypt_ticket(). The callback is responsible for
1261 * checking |retv| before it performs any action
1263 if (s->session_ctx->decrypt_ticket_cb != NULL) {
1264 size_t keyname_len = size;
1266 if (keyname_len > TLSEXT_KEYNAME_LENGTH)
1267 keyname_len = TLSEXT_KEYNAME_LENGTH;
1268 retv = s->session_ctx->decrypt_ticket_cb(s, *ret,
1269 PACKET_data(&ticketext->data),
1271 retv, s->session_ctx->ticket_cb_data);
1275 case SSL_TICKET_NO_DECRYPT:
1276 s->ext.ticket_expected = 1;
1277 return SSL_TICKET_NO_DECRYPT;
1279 case SSL_TICKET_SUCCESS:
1280 return SSL_TICKET_SUCCESS;
1282 case SSL_TICKET_SUCCESS_RENEW:
1283 s->ext.ticket_expected = 1;
1284 return SSL_TICKET_SUCCESS;
1286 case SSL_TICKET_EMPTY:
1287 s->ext.ticket_expected = 1;
1288 return SSL_TICKET_EMPTY;
1290 case SSL_TICKET_NONE:
1291 return SSL_TICKET_NONE;
1294 return SSL_TICKET_FATAL_ERR_OTHER;
1299 * tls_decrypt_ticket attempts to decrypt a session ticket.
1301 * etick: points to the body of the session ticket extension.
1302 * eticklen: the length of the session tickets extension.
1303 * sess_id: points at the session ID.
1304 * sesslen: the length of the session ID.
1305 * psess: (output) on return, if a ticket was decrypted, then this is set to
1306 * point to the resulting session.
1308 SSL_TICKET_RETURN tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1309 size_t eticklen, const unsigned char *sess_id,
1310 size_t sesslen, SSL_SESSION **psess)
1313 unsigned char *sdec;
1314 const unsigned char *p;
1315 int slen, renew_ticket = 0, declen;
1316 SSL_TICKET_RETURN ret = SSL_TICKET_FATAL_ERR_OTHER;
1318 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1319 HMAC_CTX *hctx = NULL;
1320 EVP_CIPHER_CTX *ctx = NULL;
1321 SSL_CTX *tctx = s->session_ctx;
1323 /* Need at least keyname + iv */
1324 if (eticklen < TLSEXT_KEYNAME_LENGTH + EVP_MAX_IV_LENGTH) {
1325 ret = SSL_TICKET_NO_DECRYPT;
1329 /* Initialize session ticket encryption and HMAC contexts */
1330 hctx = HMAC_CTX_new();
1332 return SSL_TICKET_FATAL_ERR_MALLOC;
1333 ctx = EVP_CIPHER_CTX_new();
1335 ret = SSL_TICKET_FATAL_ERR_MALLOC;
1338 if (tctx->ext.ticket_key_cb) {
1339 unsigned char *nctick = (unsigned char *)etick;
1340 int rv = tctx->ext.ticket_key_cb(s, nctick,
1341 nctick + TLSEXT_KEYNAME_LENGTH,
1346 ret = SSL_TICKET_NO_DECRYPT;
1352 /* Check key name matches */
1353 if (memcmp(etick, tctx->ext.tick_key_name,
1354 TLSEXT_KEYNAME_LENGTH) != 0) {
1355 ret = SSL_TICKET_NO_DECRYPT;
1358 if (HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key,
1359 sizeof(tctx->ext.secure->tick_hmac_key),
1360 EVP_sha256(), NULL) <= 0
1361 || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
1362 tctx->ext.secure->tick_aes_key,
1363 etick + TLSEXT_KEYNAME_LENGTH) <= 0) {
1368 * Attempt to process session ticket, first conduct sanity and integrity
1371 mlen = HMAC_size(hctx);
1375 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1377 TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1378 ret = SSL_TICKET_NO_DECRYPT;
1382 /* Check HMAC of encrypted ticket */
1383 if (HMAC_Update(hctx, etick, eticklen) <= 0
1384 || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
1387 HMAC_CTX_free(hctx);
1388 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
1389 EVP_CIPHER_CTX_free(ctx);
1390 return SSL_TICKET_NO_DECRYPT;
1392 /* Attempt to decrypt session data */
1393 /* Move p after IV to start of encrypted ticket, update length */
1394 p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1395 eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1396 sdec = OPENSSL_malloc(eticklen);
1397 if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1398 (int)eticklen) <= 0) {
1399 EVP_CIPHER_CTX_free(ctx);
1401 return SSL_TICKET_FATAL_ERR_OTHER;
1403 if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
1404 EVP_CIPHER_CTX_free(ctx);
1406 return SSL_TICKET_NO_DECRYPT;
1409 EVP_CIPHER_CTX_free(ctx);
1413 sess = d2i_SSL_SESSION(NULL, &p, slen);
1417 /* Some additional consistency checks */
1419 SSL_SESSION_free(sess);
1420 return SSL_TICKET_NO_DECRYPT;
1423 * The session ID, if non-empty, is used by some clients to detect
1424 * that the ticket has been accepted. So we copy it to the session
1425 * structure. If it is empty set length to zero as required by
1429 memcpy(sess->session_id, sess_id, sesslen);
1430 sess->session_id_length = sesslen;
1434 return SSL_TICKET_SUCCESS_RENEW;
1436 return SSL_TICKET_SUCCESS;
1440 * For session parse failure, indicate that we need to send a new ticket.
1442 return SSL_TICKET_NO_DECRYPT;
1444 EVP_CIPHER_CTX_free(ctx);
1445 HMAC_CTX_free(hctx);
1449 /* Check to see if a signature algorithm is allowed */
1450 static int tls12_sigalg_allowed(SSL *s, int op, const SIGALG_LOOKUP *lu)
1452 unsigned char sigalgstr[2];
1455 /* See if sigalgs is recognised and if hash is enabled */
1456 if (!tls1_lookup_md(lu, NULL))
1458 /* DSA is not allowed in TLS 1.3 */
1459 if (SSL_IS_TLS13(s) && lu->sig == EVP_PKEY_DSA)
1461 /* TODO(OpenSSL1.2) fully axe DSA/etc. in ClientHello per TLS 1.3 spec */
1462 if (!s->server && !SSL_IS_DTLS(s) && s->s3->tmp.min_ver >= TLS1_3_VERSION
1463 && (lu->sig == EVP_PKEY_DSA || lu->hash_idx == SSL_MD_SHA1_IDX
1464 || lu->hash_idx == SSL_MD_MD5_IDX
1465 || lu->hash_idx == SSL_MD_SHA224_IDX))
1467 /* See if public key algorithm allowed */
1468 if (ssl_cert_is_disabled(lu->sig_idx))
1470 if (lu->hash == NID_undef)
1472 /* Security bits: half digest bits */
1473 secbits = EVP_MD_size(ssl_md(lu->hash_idx)) * 4;
1474 /* Finally see if security callback allows it */
1475 sigalgstr[0] = (lu->sigalg >> 8) & 0xff;
1476 sigalgstr[1] = lu->sigalg & 0xff;
1477 return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
1481 * Get a mask of disabled public key algorithms based on supported signature
1482 * algorithms. For example if no signature algorithm supports RSA then RSA is
1486 void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
1488 const uint16_t *sigalgs;
1489 size_t i, sigalgslen;
1490 uint32_t disabled_mask = SSL_aRSA | SSL_aDSS | SSL_aECDSA;
1492 * Go through all signature algorithms seeing if we support any
1495 sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
1496 for (i = 0; i < sigalgslen; i++, sigalgs++) {
1497 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*sigalgs);
1498 const SSL_CERT_LOOKUP *clu;
1503 clu = ssl_cert_lookup_by_idx(lu->sig_idx);
1507 /* If algorithm is disabled see if we can enable it */
1508 if ((clu->amask & disabled_mask) != 0
1509 && tls12_sigalg_allowed(s, op, lu))
1510 disabled_mask &= ~clu->amask;
1512 *pmask_a |= disabled_mask;
1515 int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
1516 const uint16_t *psig, size_t psiglen)
1521 for (i = 0; i < psiglen; i++, psig++) {
1522 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*psig);
1524 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
1526 if (!WPACKET_put_bytes_u16(pkt, *psig))
1529 * If TLS 1.3 must have at least one valid TLS 1.3 message
1530 * signing algorithm: i.e. neither RSA nor SHA1/SHA224
1532 if (rv == 0 && (!SSL_IS_TLS13(s)
1533 || (lu->sig != EVP_PKEY_RSA
1534 && lu->hash != NID_sha1
1535 && lu->hash != NID_sha224)))
1539 SSLerr(SSL_F_TLS12_COPY_SIGALGS, SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
1543 /* Given preference and allowed sigalgs set shared sigalgs */
1544 static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
1545 const uint16_t *pref, size_t preflen,
1546 const uint16_t *allow, size_t allowlen)
1548 const uint16_t *ptmp, *atmp;
1549 size_t i, j, nmatch = 0;
1550 for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
1551 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*ptmp);
1553 /* Skip disabled hashes or signature algorithms */
1554 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, lu))
1556 for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
1557 if (*ptmp == *atmp) {
1568 /* Set shared signature algorithms for SSL structures */
1569 static int tls1_set_shared_sigalgs(SSL *s)
1571 const uint16_t *pref, *allow, *conf;
1572 size_t preflen, allowlen, conflen;
1574 const SIGALG_LOOKUP **salgs = NULL;
1576 unsigned int is_suiteb = tls1_suiteb(s);
1578 OPENSSL_free(c->shared_sigalgs);
1579 c->shared_sigalgs = NULL;
1580 c->shared_sigalgslen = 0;
1581 /* If client use client signature algorithms if not NULL */
1582 if (!s->server && c->client_sigalgs && !is_suiteb) {
1583 conf = c->client_sigalgs;
1584 conflen = c->client_sigalgslen;
1585 } else if (c->conf_sigalgs && !is_suiteb) {
1586 conf = c->conf_sigalgs;
1587 conflen = c->conf_sigalgslen;
1589 conflen = tls12_get_psigalgs(s, 0, &conf);
1590 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
1593 allow = s->s3->tmp.peer_sigalgs;
1594 allowlen = s->s3->tmp.peer_sigalgslen;
1598 pref = s->s3->tmp.peer_sigalgs;
1599 preflen = s->s3->tmp.peer_sigalgslen;
1601 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
1603 salgs = OPENSSL_malloc(nmatch * sizeof(*salgs));
1606 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
1610 c->shared_sigalgs = salgs;
1611 c->shared_sigalgslen = nmatch;
1615 int tls1_save_u16(PACKET *pkt, uint16_t **pdest, size_t *pdestlen)
1621 size = PACKET_remaining(pkt);
1623 /* Invalid data length */
1624 if (size == 0 || (size & 1) != 0)
1629 buf = OPENSSL_malloc(size * sizeof(*buf));
1632 for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
1640 OPENSSL_free(*pdest);
1647 int tls1_save_sigalgs(SSL *s, PACKET *pkt, int cert)
1649 /* Extension ignored for inappropriate versions */
1650 if (!SSL_USE_SIGALGS(s))
1652 /* Should never happen */
1653 if (s->cert == NULL)
1657 return tls1_save_u16(pkt, &s->s3->tmp.peer_cert_sigalgs,
1658 &s->s3->tmp.peer_cert_sigalgslen);
1660 return tls1_save_u16(pkt, &s->s3->tmp.peer_sigalgs,
1661 &s->s3->tmp.peer_sigalgslen);
1665 /* Set preferred digest for each key type */
1667 int tls1_process_sigalgs(SSL *s)
1670 uint32_t *pvalid = s->s3->tmp.valid_flags;
1673 if (!tls1_set_shared_sigalgs(s))
1676 for (i = 0; i < SSL_PKEY_NUM; i++)
1679 for (i = 0; i < c->shared_sigalgslen; i++) {
1680 const SIGALG_LOOKUP *sigptr = c->shared_sigalgs[i];
1681 int idx = sigptr->sig_idx;
1683 /* Ignore PKCS1 based sig algs in TLSv1.3 */
1684 if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
1686 /* If not disabled indicate we can explicitly sign */
1687 if (pvalid[idx] == 0 && !ssl_cert_is_disabled(idx))
1688 pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
1693 int SSL_get_sigalgs(SSL *s, int idx,
1694 int *psign, int *phash, int *psignhash,
1695 unsigned char *rsig, unsigned char *rhash)
1697 uint16_t *psig = s->s3->tmp.peer_sigalgs;
1698 size_t numsigalgs = s->s3->tmp.peer_sigalgslen;
1699 if (psig == NULL || numsigalgs > INT_MAX)
1702 const SIGALG_LOOKUP *lu;
1704 if (idx >= (int)numsigalgs)
1708 *rhash = (unsigned char)((*psig >> 8) & 0xff);
1710 *rsig = (unsigned char)(*psig & 0xff);
1711 lu = tls1_lookup_sigalg(*psig);
1713 *psign = lu != NULL ? lu->sig : NID_undef;
1715 *phash = lu != NULL ? lu->hash : NID_undef;
1716 if (psignhash != NULL)
1717 *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
1719 return (int)numsigalgs;
1722 int SSL_get_shared_sigalgs(SSL *s, int idx,
1723 int *psign, int *phash, int *psignhash,
1724 unsigned char *rsig, unsigned char *rhash)
1726 const SIGALG_LOOKUP *shsigalgs;
1727 if (s->cert->shared_sigalgs == NULL
1729 || idx >= (int)s->cert->shared_sigalgslen
1730 || s->cert->shared_sigalgslen > INT_MAX)
1732 shsigalgs = s->cert->shared_sigalgs[idx];
1734 *phash = shsigalgs->hash;
1736 *psign = shsigalgs->sig;
1737 if (psignhash != NULL)
1738 *psignhash = shsigalgs->sigandhash;
1740 *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
1742 *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
1743 return (int)s->cert->shared_sigalgslen;
1746 /* Maximum possible number of unique entries in sigalgs array */
1747 #define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
1751 /* TLSEXT_SIGALG_XXX values */
1752 uint16_t sigalgs[TLS_MAX_SIGALGCNT];
1755 static void get_sigorhash(int *psig, int *phash, const char *str)
1757 if (strcmp(str, "RSA") == 0) {
1758 *psig = EVP_PKEY_RSA;
1759 } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
1760 *psig = EVP_PKEY_RSA_PSS;
1761 } else if (strcmp(str, "DSA") == 0) {
1762 *psig = EVP_PKEY_DSA;
1763 } else if (strcmp(str, "ECDSA") == 0) {
1764 *psig = EVP_PKEY_EC;
1766 *phash = OBJ_sn2nid(str);
1767 if (*phash == NID_undef)
1768 *phash = OBJ_ln2nid(str);
1771 /* Maximum length of a signature algorithm string component */
1772 #define TLS_MAX_SIGSTRING_LEN 40
1774 static int sig_cb(const char *elem, int len, void *arg)
1776 sig_cb_st *sarg = arg;
1778 const SIGALG_LOOKUP *s;
1779 char etmp[TLS_MAX_SIGSTRING_LEN], *p;
1780 int sig_alg = NID_undef, hash_alg = NID_undef;
1783 if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
1785 if (len > (int)(sizeof(etmp) - 1))
1787 memcpy(etmp, elem, len);
1789 p = strchr(etmp, '+');
1791 * We only allow SignatureSchemes listed in the sigalg_lookup_tbl;
1792 * if there's no '+' in the provided name, look for the new-style combined
1793 * name. If not, match both sig+hash to find the needed SIGALG_LOOKUP.
1794 * Just sig+hash is not unique since TLS 1.3 adds rsa_pss_pss_* and
1795 * rsa_pss_rsae_* that differ only by public key OID; in such cases
1796 * we will pick the _rsae_ variant, by virtue of them appearing earlier
1800 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1802 if (s->name != NULL && strcmp(etmp, s->name) == 0) {
1803 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
1807 if (i == OSSL_NELEM(sigalg_lookup_tbl))
1814 get_sigorhash(&sig_alg, &hash_alg, etmp);
1815 get_sigorhash(&sig_alg, &hash_alg, p);
1816 if (sig_alg == NID_undef || hash_alg == NID_undef)
1818 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1820 if (s->hash == hash_alg && s->sig == sig_alg) {
1821 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
1825 if (i == OSSL_NELEM(sigalg_lookup_tbl))
1829 /* Reject duplicates */
1830 for (i = 0; i < sarg->sigalgcnt - 1; i++) {
1831 if (sarg->sigalgs[i] == sarg->sigalgs[sarg->sigalgcnt - 1]) {
1840 * Set supported signature algorithms based on a colon separated list of the
1841 * form sig+hash e.g. RSA+SHA512:DSA+SHA512
1843 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
1847 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
1851 return tls1_set_raw_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
1854 int tls1_set_raw_sigalgs(CERT *c, const uint16_t *psigs, size_t salglen,
1859 sigalgs = OPENSSL_malloc(salglen * sizeof(*sigalgs));
1860 if (sigalgs == NULL)
1862 memcpy(sigalgs, psigs, salglen * sizeof(*sigalgs));
1865 OPENSSL_free(c->client_sigalgs);
1866 c->client_sigalgs = sigalgs;
1867 c->client_sigalgslen = salglen;
1869 OPENSSL_free(c->conf_sigalgs);
1870 c->conf_sigalgs = sigalgs;
1871 c->conf_sigalgslen = salglen;
1877 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
1879 uint16_t *sigalgs, *sptr;
1884 sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs));
1885 if (sigalgs == NULL)
1887 for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
1889 const SIGALG_LOOKUP *curr;
1890 int md_id = *psig_nids++;
1891 int sig_id = *psig_nids++;
1893 for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
1895 if (curr->hash == md_id && curr->sig == sig_id) {
1896 *sptr++ = curr->sigalg;
1901 if (j == OSSL_NELEM(sigalg_lookup_tbl))
1906 OPENSSL_free(c->client_sigalgs);
1907 c->client_sigalgs = sigalgs;
1908 c->client_sigalgslen = salglen / 2;
1910 OPENSSL_free(c->conf_sigalgs);
1911 c->conf_sigalgs = sigalgs;
1912 c->conf_sigalgslen = salglen / 2;
1918 OPENSSL_free(sigalgs);
1922 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
1926 if (default_nid == -1)
1928 sig_nid = X509_get_signature_nid(x);
1930 return sig_nid == default_nid ? 1 : 0;
1931 for (i = 0; i < c->shared_sigalgslen; i++)
1932 if (sig_nid == c->shared_sigalgs[i]->sigandhash)
1937 /* Check to see if a certificate issuer name matches list of CA names */
1938 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
1942 nm = X509_get_issuer_name(x);
1943 for (i = 0; i < sk_X509_NAME_num(names); i++) {
1944 if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
1951 * Check certificate chain is consistent with TLS extensions and is usable by
1952 * server. This servers two purposes: it allows users to check chains before
1953 * passing them to the server and it allows the server to check chains before
1954 * attempting to use them.
1957 /* Flags which need to be set for a certificate when strict mode not set */
1959 #define CERT_PKEY_VALID_FLAGS \
1960 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
1961 /* Strict mode flags */
1962 #define CERT_PKEY_STRICT_FLAGS \
1963 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
1964 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
1966 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
1971 int check_flags = 0, strict_mode;
1972 CERT_PKEY *cpk = NULL;
1975 unsigned int suiteb_flags = tls1_suiteb(s);
1976 /* idx == -1 means checking server chains */
1978 /* idx == -2 means checking client certificate chains */
1981 idx = (int)(cpk - c->pkeys);
1983 cpk = c->pkeys + idx;
1984 pvalid = s->s3->tmp.valid_flags + idx;
1986 pk = cpk->privatekey;
1988 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
1989 /* If no cert or key, forget it */
1998 if (ssl_cert_lookup_by_pkey(pk, &certidx) == NULL)
2001 pvalid = s->s3->tmp.valid_flags + idx;
2003 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
2004 check_flags = CERT_PKEY_STRICT_FLAGS;
2006 check_flags = CERT_PKEY_VALID_FLAGS;
2013 check_flags |= CERT_PKEY_SUITEB;
2014 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
2015 if (ok == X509_V_OK)
2016 rv |= CERT_PKEY_SUITEB;
2017 else if (!check_flags)
2022 * Check all signature algorithms are consistent with signature
2023 * algorithms extension if TLS 1.2 or later and strict mode.
2025 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
2028 if (s->s3->tmp.peer_cert_sigalgs != NULL
2029 || s->s3->tmp.peer_sigalgs != NULL) {
2031 /* If no sigalgs extension use defaults from RFC5246 */
2035 rsign = EVP_PKEY_RSA;
2036 default_nid = NID_sha1WithRSAEncryption;
2039 case SSL_PKEY_DSA_SIGN:
2040 rsign = EVP_PKEY_DSA;
2041 default_nid = NID_dsaWithSHA1;
2045 rsign = EVP_PKEY_EC;
2046 default_nid = NID_ecdsa_with_SHA1;
2049 case SSL_PKEY_GOST01:
2050 rsign = NID_id_GostR3410_2001;
2051 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
2054 case SSL_PKEY_GOST12_256:
2055 rsign = NID_id_GostR3410_2012_256;
2056 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
2059 case SSL_PKEY_GOST12_512:
2060 rsign = NID_id_GostR3410_2012_512;
2061 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
2070 * If peer sent no signature algorithms extension and we have set
2071 * preferred signature algorithms check we support sha1.
2073 if (default_nid > 0 && c->conf_sigalgs) {
2075 const uint16_t *p = c->conf_sigalgs;
2076 for (j = 0; j < c->conf_sigalgslen; j++, p++) {
2077 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*p);
2079 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
2082 if (j == c->conf_sigalgslen) {
2089 /* Check signature algorithm of each cert in chain */
2090 if (!tls1_check_sig_alg(c, x, default_nid)) {
2094 rv |= CERT_PKEY_EE_SIGNATURE;
2095 rv |= CERT_PKEY_CA_SIGNATURE;
2096 for (i = 0; i < sk_X509_num(chain); i++) {
2097 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
2099 rv &= ~CERT_PKEY_CA_SIGNATURE;
2106 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
2107 else if (check_flags)
2108 rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
2110 /* Check cert parameters are consistent */
2111 if (tls1_check_cert_param(s, x, 1))
2112 rv |= CERT_PKEY_EE_PARAM;
2113 else if (!check_flags)
2116 rv |= CERT_PKEY_CA_PARAM;
2117 /* In strict mode check rest of chain too */
2118 else if (strict_mode) {
2119 rv |= CERT_PKEY_CA_PARAM;
2120 for (i = 0; i < sk_X509_num(chain); i++) {
2121 X509 *ca = sk_X509_value(chain, i);
2122 if (!tls1_check_cert_param(s, ca, 0)) {
2124 rv &= ~CERT_PKEY_CA_PARAM;
2131 if (!s->server && strict_mode) {
2132 STACK_OF(X509_NAME) *ca_dn;
2134 switch (EVP_PKEY_id(pk)) {
2136 check_type = TLS_CT_RSA_SIGN;
2139 check_type = TLS_CT_DSS_SIGN;
2142 check_type = TLS_CT_ECDSA_SIGN;
2146 const uint8_t *ctypes = s->s3->tmp.ctype;
2149 for (j = 0; j < s->s3->tmp.ctype_len; j++, ctypes++) {
2150 if (*ctypes == check_type) {
2151 rv |= CERT_PKEY_CERT_TYPE;
2155 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
2158 rv |= CERT_PKEY_CERT_TYPE;
2161 ca_dn = s->s3->tmp.peer_ca_names;
2163 if (!sk_X509_NAME_num(ca_dn))
2164 rv |= CERT_PKEY_ISSUER_NAME;
2166 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2167 if (ssl_check_ca_name(ca_dn, x))
2168 rv |= CERT_PKEY_ISSUER_NAME;
2170 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2171 for (i = 0; i < sk_X509_num(chain); i++) {
2172 X509 *xtmp = sk_X509_value(chain, i);
2173 if (ssl_check_ca_name(ca_dn, xtmp)) {
2174 rv |= CERT_PKEY_ISSUER_NAME;
2179 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
2182 rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
2184 if (!check_flags || (rv & check_flags) == check_flags)
2185 rv |= CERT_PKEY_VALID;
2189 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2190 rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2192 rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
2195 * When checking a CERT_PKEY structure all flags are irrelevant if the
2199 if (rv & CERT_PKEY_VALID) {
2202 /* Preserve sign and explicit sign flag, clear rest */
2203 *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
2210 /* Set validity of certificates in an SSL structure */
2211 void tls1_set_cert_validity(SSL *s)
2213 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
2214 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_PSS_SIGN);
2215 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
2216 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
2217 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2218 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2219 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
2220 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED25519);
2221 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED448);
2224 /* User level utility function to check a chain is suitable */
2225 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
2227 return tls1_check_chain(s, x, pk, chain, -1);
2230 #ifndef OPENSSL_NO_DH
2231 DH *ssl_get_auto_dh(SSL *s)
2233 int dh_secbits = 80;
2234 if (s->cert->dh_tmp_auto == 2)
2235 return DH_get_1024_160();
2236 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
2237 if (s->s3->tmp.new_cipher->strength_bits == 256)
2242 if (s->s3->tmp.cert == NULL)
2244 dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
2247 if (dh_secbits >= 128) {
2255 if (dh_secbits >= 192)
2256 p = BN_get_rfc3526_prime_8192(NULL);
2258 p = BN_get_rfc3526_prime_3072(NULL);
2259 if (p == NULL || g == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
2267 if (dh_secbits >= 112)
2268 return DH_get_2048_224();
2269 return DH_get_1024_160();
2273 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2276 EVP_PKEY *pkey = X509_get0_pubkey(x);
2279 * If no parameters this will return -1 and fail using the default
2280 * security callback for any non-zero security level. This will
2281 * reject keys which omit parameters but this only affects DSA and
2282 * omission of parameters is never (?) done in practice.
2284 secbits = EVP_PKEY_security_bits(pkey);
2287 return ssl_security(s, op, secbits, 0, x);
2289 return ssl_ctx_security(ctx, op, secbits, 0, x);
2292 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2294 /* Lookup signature algorithm digest */
2295 int secbits, nid, pknid;
2296 /* Don't check signature if self signed */
2297 if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2299 if (!X509_get_signature_info(x, &nid, &pknid, &secbits, NULL))
2301 /* If digest NID not defined use signature NID */
2302 if (nid == NID_undef)
2305 return ssl_security(s, op, secbits, nid, x);
2307 return ssl_ctx_security(ctx, op, secbits, nid, x);
2310 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
2313 vfy = SSL_SECOP_PEER;
2315 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2316 return SSL_R_EE_KEY_TOO_SMALL;
2318 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2319 return SSL_R_CA_KEY_TOO_SMALL;
2321 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2322 return SSL_R_CA_MD_TOO_WEAK;
2327 * Check security of a chain, if |sk| includes the end entity certificate then
2328 * |x| is NULL. If |vfy| is 1 then we are verifying a peer chain and not sending
2329 * one to the peer. Return values: 1 if ok otherwise error code to use
2332 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
2334 int rv, start_idx, i;
2336 x = sk_X509_value(sk, 0);
2341 rv = ssl_security_cert(s, NULL, x, vfy, 1);
2345 for (i = start_idx; i < sk_X509_num(sk); i++) {
2346 x = sk_X509_value(sk, i);
2347 rv = ssl_security_cert(s, NULL, x, vfy, 0);
2355 * For TLS 1.2 servers check if we have a certificate which can be used
2356 * with the signature algorithm "lu" and return index of certificate.
2359 static int tls12_get_cert_sigalg_idx(const SSL *s, const SIGALG_LOOKUP *lu)
2361 int sig_idx = lu->sig_idx;
2362 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(sig_idx);
2364 /* If not recognised or not supported by cipher mask it is not suitable */
2365 if (clu == NULL || !(clu->amask & s->s3->tmp.new_cipher->algorithm_auth))
2368 return s->s3->tmp.valid_flags[sig_idx] & CERT_PKEY_VALID ? sig_idx : -1;
2372 * Returns true if |s| has a usable certificate configured for use
2373 * with signature scheme |sig|.
2374 * "Usable" includes a check for presence as well as applying
2375 * the signature_algorithm_cert restrictions sent by the peer (if any).
2376 * Returns false if no usable certificate is found.
2378 static int has_usable_cert(SSL *s, const SIGALG_LOOKUP *sig, int idx)
2380 const SIGALG_LOOKUP *lu;
2384 /* TLS 1.2 callers can override lu->sig_idx, but not TLS 1.3 callers. */
2387 if (!ssl_has_cert(s, idx))
2389 if (s->s3->tmp.peer_cert_sigalgs != NULL) {
2390 for (i = 0; i < s->s3->tmp.peer_cert_sigalgslen; i++) {
2391 lu = tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i]);
2393 || !X509_get_signature_info(s->cert->pkeys[idx].x509, &mdnid,
2394 &pknid, NULL, NULL))
2397 * TODO this does not differentiate between the
2398 * rsa_pss_pss_* and rsa_pss_rsae_* schemes since we do not
2399 * have a chain here that lets us look at the key OID in the
2400 * signing certificate.
2402 if (mdnid == lu->hash && pknid == lu->sig)
2411 * Choose an appropriate signature algorithm based on available certificates
2412 * Sets chosen certificate and signature algorithm.
2414 * For servers if we fail to find a required certificate it is a fatal error,
2415 * an appropriate error code is set and a TLS alert is sent.
2417 * For clients fatalerrs is set to 0. If a certificate is not suitable it is not
2418 * a fatal error: we will either try another certificate or not present one
2419 * to the server. In this case no error is set.
2421 int tls_choose_sigalg(SSL *s, int fatalerrs)
2423 const SIGALG_LOOKUP *lu = NULL;
2426 s->s3->tmp.cert = NULL;
2427 s->s3->tmp.sigalg = NULL;
2429 if (SSL_IS_TLS13(s)) {
2431 #ifndef OPENSSL_NO_EC
2432 int curve = -1, skip_ec = 0;
2435 /* Look for a certificate matching shared sigalgs */
2436 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
2437 lu = s->cert->shared_sigalgs[i];
2440 /* Skip SHA1, SHA224, DSA and RSA if not PSS */
2441 if (lu->hash == NID_sha1
2442 || lu->hash == NID_sha224
2443 || lu->sig == EVP_PKEY_DSA
2444 || lu->sig == EVP_PKEY_RSA)
2446 /* Check that we have a cert, and signature_algorithms_cert */
2447 if (!tls1_lookup_md(lu, NULL) || !has_usable_cert(s, lu, -1))
2449 if (lu->sig == EVP_PKEY_EC) {
2450 #ifndef OPENSSL_NO_EC
2452 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[SSL_PKEY_ECC].privatekey);
2454 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2455 if (EC_KEY_get_conv_form(ec)
2456 != POINT_CONVERSION_UNCOMPRESSED)
2459 if (skip_ec || (lu->curve != NID_undef && curve != lu->curve))
2464 } else if (lu->sig == EVP_PKEY_RSA_PSS) {
2465 /* validate that key is large enough for the signature algorithm */
2468 pkey = s->cert->pkeys[lu->sig_idx].privatekey;
2469 if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(pkey), lu))
2474 if (i == s->cert->shared_sigalgslen) {
2477 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_CHOOSE_SIGALG,
2478 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2482 /* If ciphersuite doesn't require a cert nothing to do */
2483 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aCERT))
2485 if (!s->server && !ssl_has_cert(s, s->cert->key - s->cert->pkeys))
2488 if (SSL_USE_SIGALGS(s)) {
2490 if (s->s3->tmp.peer_sigalgs != NULL) {
2491 #ifndef OPENSSL_NO_EC
2494 /* For Suite B need to match signature algorithm to curve */
2495 if (tls1_suiteb(s)) {
2496 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[SSL_PKEY_ECC].privatekey);
2497 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2504 * Find highest preference signature algorithm matching
2507 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
2508 lu = s->cert->shared_sigalgs[i];
2511 if ((sig_idx = tls12_get_cert_sigalg_idx(s, lu)) == -1)
2514 int cc_idx = s->cert->key - s->cert->pkeys;
2516 sig_idx = lu->sig_idx;
2517 if (cc_idx != sig_idx)
2520 /* Check that we have a cert, and sig_algs_cert */
2521 if (!has_usable_cert(s, lu, sig_idx))
2523 if (lu->sig == EVP_PKEY_RSA_PSS) {
2524 /* validate that key is large enough for the signature algorithm */
2525 EVP_PKEY *pkey = s->cert->pkeys[sig_idx].privatekey;
2527 if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(pkey), lu))
2530 #ifndef OPENSSL_NO_EC
2531 if (curve == -1 || lu->curve == curve)
2535 if (i == s->cert->shared_sigalgslen) {
2538 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2539 ERR_R_INTERNAL_ERROR);
2544 * If we have no sigalg use defaults
2546 const uint16_t *sent_sigs;
2547 size_t sent_sigslen;
2549 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2552 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2553 ERR_R_INTERNAL_ERROR);
2557 /* Check signature matches a type we sent */
2558 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
2559 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
2560 if (lu->sigalg == *sent_sigs
2561 && has_usable_cert(s, lu, lu->sig_idx))
2564 if (i == sent_sigslen) {
2567 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
2568 SSL_F_TLS_CHOOSE_SIGALG,
2569 SSL_R_WRONG_SIGNATURE_TYPE);
2574 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2577 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2578 ERR_R_INTERNAL_ERROR);
2584 sig_idx = lu->sig_idx;
2585 s->s3->tmp.cert = &s->cert->pkeys[sig_idx];
2586 s->cert->key = s->s3->tmp.cert;
2587 s->s3->tmp.sigalg = lu;
2591 int SSL_CTX_set_tlsext_max_fragment_length(SSL_CTX *ctx, uint8_t mode)
2593 if (mode != TLSEXT_max_fragment_length_DISABLED
2594 && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2595 SSLerr(SSL_F_SSL_CTX_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2596 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2600 ctx->ext.max_fragment_len_mode = mode;
2604 int SSL_set_tlsext_max_fragment_length(SSL *ssl, uint8_t mode)
2606 if (mode != TLSEXT_max_fragment_length_DISABLED
2607 && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2608 SSLerr(SSL_F_SSL_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2609 SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2613 ssl->ext.max_fragment_len_mode = mode;
2617 uint8_t SSL_SESSION_get_max_fragment_length(const SSL_SESSION *session)
2619 return session->ext.max_fragment_len_mode;