xref: /freebsd/crypto/openssl/ssl/t1_lib.c (revision 17f01e9963948a18f55eb97173123702c5dae671)
1e71b7053SJung-uk Kim /*
2*17f01e99SJung-uk Kim  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
374664626SKris Kennaway  *
4e71b7053SJung-uk Kim  * Licensed under the OpenSSL license (the "License").  You may not use
5e71b7053SJung-uk Kim  * this file except in compliance with the License.  You can obtain a copy
6e71b7053SJung-uk Kim  * in the file LICENSE in the source distribution or at
7e71b7053SJung-uk Kim  * https://www.openssl.org/source/license.html
81f13597dSJung-uk Kim  */
974664626SKris Kennaway 
1074664626SKris Kennaway #include <stdio.h>
11e71b7053SJung-uk Kim #include <stdlib.h>
1274664626SKris Kennaway #include <openssl/objects.h>
13db522d3aSSimon L. B. Nielsen #include <openssl/evp.h>
14db522d3aSSimon L. B. Nielsen #include <openssl/hmac.h>
15db522d3aSSimon L. B. Nielsen #include <openssl/ocsp.h>
16e71b7053SJung-uk Kim #include <openssl/conf.h>
17e71b7053SJung-uk Kim #include <openssl/x509v3.h>
18e71b7053SJung-uk Kim #include <openssl/dh.h>
19e71b7053SJung-uk Kim #include <openssl/bn.h>
20e71b7053SJung-uk Kim #include "internal/nelem.h"
21*17f01e99SJung-uk Kim #include "ssl_local.h"
22e71b7053SJung-uk Kim #include <openssl/ct.h>
2374664626SKris Kennaway 
24da327cd2SJung-uk Kim static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey);
25*17f01e99SJung-uk Kim static int tls12_sigalg_allowed(const SSL *s, int op, const SIGALG_LOOKUP *lu);
26da327cd2SJung-uk Kim 
27e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_enc_data = {
2874664626SKris Kennaway     tls1_enc,
2974664626SKris Kennaway     tls1_mac,
3074664626SKris Kennaway     tls1_setup_key_block,
3174664626SKris Kennaway     tls1_generate_master_secret,
3274664626SKris Kennaway     tls1_change_cipher_state,
3374664626SKris Kennaway     tls1_final_finish_mac,
3474664626SKris Kennaway     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
3574664626SKris Kennaway     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
3674664626SKris Kennaway     tls1_alert_code,
371f13597dSJung-uk Kim     tls1_export_keying_material,
387bded2dbSJung-uk Kim     0,
397bded2dbSJung-uk Kim     ssl3_set_handshake_header,
40e71b7053SJung-uk Kim     tls_close_construct_packet,
417bded2dbSJung-uk Kim     ssl3_handshake_write
427bded2dbSJung-uk Kim };
437bded2dbSJung-uk Kim 
44e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_1_enc_data = {
457bded2dbSJung-uk Kim     tls1_enc,
467bded2dbSJung-uk Kim     tls1_mac,
477bded2dbSJung-uk Kim     tls1_setup_key_block,
487bded2dbSJung-uk Kim     tls1_generate_master_secret,
497bded2dbSJung-uk Kim     tls1_change_cipher_state,
507bded2dbSJung-uk Kim     tls1_final_finish_mac,
517bded2dbSJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
527bded2dbSJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
537bded2dbSJung-uk Kim     tls1_alert_code,
547bded2dbSJung-uk Kim     tls1_export_keying_material,
557bded2dbSJung-uk Kim     SSL_ENC_FLAG_EXPLICIT_IV,
567bded2dbSJung-uk Kim     ssl3_set_handshake_header,
57e71b7053SJung-uk Kim     tls_close_construct_packet,
587bded2dbSJung-uk Kim     ssl3_handshake_write
597bded2dbSJung-uk Kim };
607bded2dbSJung-uk Kim 
61e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_2_enc_data = {
627bded2dbSJung-uk Kim     tls1_enc,
637bded2dbSJung-uk Kim     tls1_mac,
647bded2dbSJung-uk Kim     tls1_setup_key_block,
657bded2dbSJung-uk Kim     tls1_generate_master_secret,
667bded2dbSJung-uk Kim     tls1_change_cipher_state,
677bded2dbSJung-uk Kim     tls1_final_finish_mac,
687bded2dbSJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
697bded2dbSJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
707bded2dbSJung-uk Kim     tls1_alert_code,
717bded2dbSJung-uk Kim     tls1_export_keying_material,
727bded2dbSJung-uk Kim     SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
737bded2dbSJung-uk Kim         | SSL_ENC_FLAG_TLS1_2_CIPHERS,
747bded2dbSJung-uk Kim     ssl3_set_handshake_header,
75e71b7053SJung-uk Kim     tls_close_construct_packet,
76e71b7053SJung-uk Kim     ssl3_handshake_write
77e71b7053SJung-uk Kim };
78e71b7053SJung-uk Kim 
79e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_3_enc_data = {
80e71b7053SJung-uk Kim     tls13_enc,
81e71b7053SJung-uk Kim     tls1_mac,
82e71b7053SJung-uk Kim     tls13_setup_key_block,
83e71b7053SJung-uk Kim     tls13_generate_master_secret,
84e71b7053SJung-uk Kim     tls13_change_cipher_state,
85e71b7053SJung-uk Kim     tls13_final_finish_mac,
86e71b7053SJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
87e71b7053SJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
88e71b7053SJung-uk Kim     tls13_alert_code,
89e71b7053SJung-uk Kim     tls13_export_keying_material,
90e71b7053SJung-uk Kim     SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
91e71b7053SJung-uk Kim     ssl3_set_handshake_header,
92e71b7053SJung-uk Kim     tls_close_construct_packet,
937bded2dbSJung-uk Kim     ssl3_handshake_write
9474664626SKris Kennaway };
9574664626SKris Kennaway 
963b4e3dcbSSimon L. B. Nielsen long tls1_default_timeout(void)
9774664626SKris Kennaway {
986f9291ceSJung-uk Kim     /*
996f9291ceSJung-uk Kim      * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
1006f9291ceSJung-uk Kim      * http, the cache would over fill
1016f9291ceSJung-uk Kim      */
10274664626SKris Kennaway     return (60 * 60 * 2);
10374664626SKris Kennaway }
10474664626SKris Kennaway 
10574664626SKris Kennaway int tls1_new(SSL *s)
10674664626SKris Kennaway {
1076f9291ceSJung-uk Kim     if (!ssl3_new(s))
108e71b7053SJung-uk Kim         return 0;
109e71b7053SJung-uk Kim     if (!s->method->ssl_clear(s))
110e71b7053SJung-uk Kim         return 0;
111e71b7053SJung-uk Kim 
112e71b7053SJung-uk Kim     return 1;
11374664626SKris Kennaway }
11474664626SKris Kennaway 
11574664626SKris Kennaway void tls1_free(SSL *s)
11674664626SKris Kennaway {
117e71b7053SJung-uk Kim     OPENSSL_free(s->ext.session_ticket);
11874664626SKris Kennaway     ssl3_free(s);
11974664626SKris Kennaway }
12074664626SKris Kennaway 
121e71b7053SJung-uk Kim int tls1_clear(SSL *s)
12274664626SKris Kennaway {
123e71b7053SJung-uk Kim     if (!ssl3_clear(s))
124e71b7053SJung-uk Kim         return 0;
125e71b7053SJung-uk Kim 
126e71b7053SJung-uk Kim     if (s->method->version == TLS_ANY_VERSION)
127e71b7053SJung-uk Kim         s->version = TLS_MAX_VERSION;
128e71b7053SJung-uk Kim     else
1291f13597dSJung-uk Kim         s->version = s->method->version;
130e71b7053SJung-uk Kim 
131e71b7053SJung-uk Kim     return 1;
13274664626SKris Kennaway }
13374664626SKris Kennaway 
1341f13597dSJung-uk Kim #ifndef OPENSSL_NO_EC
1351f13597dSJung-uk Kim 
136e71b7053SJung-uk Kim /*
137e71b7053SJung-uk Kim  * Table of curve information.
138e71b7053SJung-uk Kim  * Do not delete entries or reorder this array! It is used as a lookup
139e71b7053SJung-uk Kim  * table: the index of each entry is one less than the TLS curve id.
140e71b7053SJung-uk Kim  */
141e71b7053SJung-uk Kim static const TLS_GROUP_INFO nid_list[] = {
142e71b7053SJung-uk Kim     {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
143e71b7053SJung-uk Kim     {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
144e71b7053SJung-uk Kim     {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
145e71b7053SJung-uk Kim     {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
146e71b7053SJung-uk Kim     {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
147e71b7053SJung-uk Kim     {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
148e71b7053SJung-uk Kim     {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
149e71b7053SJung-uk Kim     {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
150e71b7053SJung-uk Kim     {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
151e71b7053SJung-uk Kim     {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
152e71b7053SJung-uk Kim     {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
153e71b7053SJung-uk Kim     {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
154e71b7053SJung-uk Kim     {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
155e71b7053SJung-uk Kim     {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
156e71b7053SJung-uk Kim     {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
157e71b7053SJung-uk Kim     {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
158e71b7053SJung-uk Kim     {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
159e71b7053SJung-uk Kim     {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
160e71b7053SJung-uk Kim     {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
161e71b7053SJung-uk Kim     {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
162e71b7053SJung-uk Kim     {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
163e71b7053SJung-uk Kim     {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
164e71b7053SJung-uk Kim     {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
165e71b7053SJung-uk Kim     {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
166e71b7053SJung-uk Kim     {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
167e71b7053SJung-uk Kim     {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
168e71b7053SJung-uk Kim     {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
169e71b7053SJung-uk Kim     {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
170e71b7053SJung-uk Kim     {EVP_PKEY_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
171e71b7053SJung-uk Kim     {EVP_PKEY_X448, 224, TLS_CURVE_CUSTOM}, /* X448 (30) */
1721f13597dSJung-uk Kim };
1731f13597dSJung-uk Kim 
1747bded2dbSJung-uk Kim static const unsigned char ecformats_default[] = {
1757bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_uncompressed,
1767bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
1777bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
1781f13597dSJung-uk Kim };
1791f13597dSJung-uk Kim 
180e71b7053SJung-uk Kim /* The default curves */
181e71b7053SJung-uk Kim static const uint16_t eccurves_default[] = {
182e71b7053SJung-uk Kim     29,                      /* X25519 (29) */
183e71b7053SJung-uk Kim     23,                      /* secp256r1 (23) */
184e71b7053SJung-uk Kim     30,                      /* X448 (30) */
185e71b7053SJung-uk Kim     25,                      /* secp521r1 (25) */
186e71b7053SJung-uk Kim     24,                      /* secp384r1 (24) */
1877bded2dbSJung-uk Kim };
1887bded2dbSJung-uk Kim 
189e71b7053SJung-uk Kim static const uint16_t suiteb_curves[] = {
190e71b7053SJung-uk Kim     TLSEXT_curve_P_256,
191e71b7053SJung-uk Kim     TLSEXT_curve_P_384
1927bded2dbSJung-uk Kim };
1937bded2dbSJung-uk Kim 
194e71b7053SJung-uk Kim const TLS_GROUP_INFO *tls1_group_id_lookup(uint16_t group_id)
1951f13597dSJung-uk Kim {
1967bded2dbSJung-uk Kim     /* ECC curves from RFC 4492 and RFC 7027 */
197e71b7053SJung-uk Kim     if (group_id < 1 || group_id > OSSL_NELEM(nid_list))
198e71b7053SJung-uk Kim         return NULL;
199e71b7053SJung-uk Kim     return &nid_list[group_id - 1];
20074664626SKris Kennaway }
201f579bf8eSKris Kennaway 
202e71b7053SJung-uk Kim static uint16_t tls1_nid2group_id(int nid)
203f579bf8eSKris Kennaway {
204e71b7053SJung-uk Kim     size_t i;
205e71b7053SJung-uk Kim     for (i = 0; i < OSSL_NELEM(nid_list); i++) {
206e71b7053SJung-uk Kim         if (nid_list[i].nid == nid)
207e71b7053SJung-uk Kim             return (uint16_t)(i + 1);
208f579bf8eSKris Kennaway     }
209e71b7053SJung-uk Kim     return 0;
2101f13597dSJung-uk Kim }
2117bded2dbSJung-uk Kim 
2127bded2dbSJung-uk Kim /*
213e71b7053SJung-uk Kim  * Set *pgroups to the supported groups list and *pgroupslen to
214e71b7053SJung-uk Kim  * the number of groups supported.
2157bded2dbSJung-uk Kim  */
216e71b7053SJung-uk Kim void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
217e71b7053SJung-uk Kim                                size_t *pgroupslen)
2187bded2dbSJung-uk Kim {
219e71b7053SJung-uk Kim 
2207bded2dbSJung-uk Kim     /* For Suite B mode only include P-256, P-384 */
2217bded2dbSJung-uk Kim     switch (tls1_suiteb(s)) {
2227bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS:
223e71b7053SJung-uk Kim         *pgroups = suiteb_curves;
224e71b7053SJung-uk Kim         *pgroupslen = OSSL_NELEM(suiteb_curves);
2257bded2dbSJung-uk Kim         break;
2267bded2dbSJung-uk Kim 
2277bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
228e71b7053SJung-uk Kim         *pgroups = suiteb_curves;
229e71b7053SJung-uk Kim         *pgroupslen = 1;
2307bded2dbSJung-uk Kim         break;
2317bded2dbSJung-uk Kim 
2327bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_192_LOS:
233e71b7053SJung-uk Kim         *pgroups = suiteb_curves + 1;
234e71b7053SJung-uk Kim         *pgroupslen = 1;
2357bded2dbSJung-uk Kim         break;
236e71b7053SJung-uk Kim 
2377bded2dbSJung-uk Kim     default:
238e71b7053SJung-uk Kim         if (s->ext.supportedgroups == NULL) {
239e71b7053SJung-uk Kim             *pgroups = eccurves_default;
240e71b7053SJung-uk Kim             *pgroupslen = OSSL_NELEM(eccurves_default);
2417bded2dbSJung-uk Kim         } else {
242e71b7053SJung-uk Kim             *pgroups = s->ext.supportedgroups;
243e71b7053SJung-uk Kim             *pgroupslen = s->ext.supportedgroups_len;
2447bded2dbSJung-uk Kim         }
245e71b7053SJung-uk Kim         break;
2467bded2dbSJung-uk Kim     }
2477bded2dbSJung-uk Kim }
2487bded2dbSJung-uk Kim 
249e71b7053SJung-uk Kim /* See if curve is allowed by security callback */
250e71b7053SJung-uk Kim int tls_curve_allowed(SSL *s, uint16_t curve, int op)
2517bded2dbSJung-uk Kim {
252e71b7053SJung-uk Kim     const TLS_GROUP_INFO *cinfo = tls1_group_id_lookup(curve);
253e71b7053SJung-uk Kim     unsigned char ctmp[2];
254e71b7053SJung-uk Kim 
255e71b7053SJung-uk Kim     if (cinfo == NULL)
2567bded2dbSJung-uk Kim         return 0;
257e71b7053SJung-uk Kim # ifdef OPENSSL_NO_EC2M
258e71b7053SJung-uk Kim     if (cinfo->flags & TLS_CURVE_CHAR2)
2597bded2dbSJung-uk Kim         return 0;
260e71b7053SJung-uk Kim # endif
261e71b7053SJung-uk Kim     ctmp[0] = curve >> 8;
262e71b7053SJung-uk Kim     ctmp[1] = curve & 0xff;
263e71b7053SJung-uk Kim     return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)ctmp);
2647bded2dbSJung-uk Kim }
265e71b7053SJung-uk Kim 
266e71b7053SJung-uk Kim /* Return 1 if "id" is in "list" */
267e71b7053SJung-uk Kim static int tls1_in_list(uint16_t id, const uint16_t *list, size_t listlen)
268e71b7053SJung-uk Kim {
269e71b7053SJung-uk Kim     size_t i;
270e71b7053SJung-uk Kim     for (i = 0; i < listlen; i++)
271e71b7053SJung-uk Kim         if (list[i] == id)
2727bded2dbSJung-uk Kim             return 1;
2737bded2dbSJung-uk Kim     return 0;
2747bded2dbSJung-uk Kim }
2757bded2dbSJung-uk Kim 
2767bded2dbSJung-uk Kim /*-
277e71b7053SJung-uk Kim  * For nmatch >= 0, return the id of the |nmatch|th shared group or 0
278e71b7053SJung-uk Kim  * if there is no match.
2797bded2dbSJung-uk Kim  * For nmatch == -1, return number of matches
280e71b7053SJung-uk Kim  * For nmatch == -2, return the id of the group to use for
281e71b7053SJung-uk Kim  * a tmp key, or 0 if there is no match.
2827bded2dbSJung-uk Kim  */
283e71b7053SJung-uk Kim uint16_t tls1_shared_group(SSL *s, int nmatch)
2847bded2dbSJung-uk Kim {
285e71b7053SJung-uk Kim     const uint16_t *pref, *supp;
286e71b7053SJung-uk Kim     size_t num_pref, num_supp, i;
2877bded2dbSJung-uk Kim     int k;
288e71b7053SJung-uk Kim 
2897bded2dbSJung-uk Kim     /* Can't do anything on client side */
2907bded2dbSJung-uk Kim     if (s->server == 0)
291e71b7053SJung-uk Kim         return 0;
2927bded2dbSJung-uk Kim     if (nmatch == -2) {
2937bded2dbSJung-uk Kim         if (tls1_suiteb(s)) {
2947bded2dbSJung-uk Kim             /*
2957bded2dbSJung-uk Kim              * For Suite B ciphersuite determines curve: we already know
2967bded2dbSJung-uk Kim              * these are acceptable due to previous checks.
2977bded2dbSJung-uk Kim              */
2987bded2dbSJung-uk Kim             unsigned long cid = s->s3->tmp.new_cipher->id;
299e71b7053SJung-uk Kim 
3007bded2dbSJung-uk Kim             if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
301e71b7053SJung-uk Kim                 return TLSEXT_curve_P_256;
3027bded2dbSJung-uk Kim             if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
303e71b7053SJung-uk Kim                 return TLSEXT_curve_P_384;
3047bded2dbSJung-uk Kim             /* Should never happen */
305e71b7053SJung-uk Kim             return 0;
3067bded2dbSJung-uk Kim         }
3077bded2dbSJung-uk Kim         /* If not Suite B just return first preference shared curve */
3087bded2dbSJung-uk Kim         nmatch = 0;
3097bded2dbSJung-uk Kim     }
3107bded2dbSJung-uk Kim     /*
311e71b7053SJung-uk Kim      * If server preference set, our groups are the preference order
312e71b7053SJung-uk Kim      * otherwise peer decides.
3137bded2dbSJung-uk Kim      */
314e71b7053SJung-uk Kim     if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
315e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &pref, &num_pref);
316e71b7053SJung-uk Kim         tls1_get_peer_groups(s, &supp, &num_supp);
317e71b7053SJung-uk Kim     } else {
318e71b7053SJung-uk Kim         tls1_get_peer_groups(s, &pref, &num_pref);
319e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &supp, &num_supp);
3207bded2dbSJung-uk Kim     }
3217bded2dbSJung-uk Kim 
322e71b7053SJung-uk Kim     for (k = 0, i = 0; i < num_pref; i++) {
323e71b7053SJung-uk Kim         uint16_t id = pref[i];
324e71b7053SJung-uk Kim 
325e71b7053SJung-uk Kim         if (!tls1_in_list(id, supp, num_supp)
326e71b7053SJung-uk Kim             || !tls_curve_allowed(s, id, SSL_SECOP_CURVE_SHARED))
327e71b7053SJung-uk Kim                     continue;
328e71b7053SJung-uk Kim         if (nmatch == k)
329e71b7053SJung-uk Kim             return id;
3307bded2dbSJung-uk Kim          k++;
3317bded2dbSJung-uk Kim     }
3327bded2dbSJung-uk Kim     if (nmatch == -1)
3337bded2dbSJung-uk Kim         return k;
3347bded2dbSJung-uk Kim     /* Out of range (nmatch > k). */
335e71b7053SJung-uk Kim     return 0;
3367bded2dbSJung-uk Kim }
3377bded2dbSJung-uk Kim 
338e71b7053SJung-uk Kim int tls1_set_groups(uint16_t **pext, size_t *pextlen,
339e71b7053SJung-uk Kim                     int *groups, size_t ngroups)
3407bded2dbSJung-uk Kim {
341e71b7053SJung-uk Kim     uint16_t *glist;
3427bded2dbSJung-uk Kim     size_t i;
3437bded2dbSJung-uk Kim     /*
344e71b7053SJung-uk Kim      * Bitmap of groups included to detect duplicates: only works while group
3457bded2dbSJung-uk Kim      * ids < 32
3467bded2dbSJung-uk Kim      */
3477bded2dbSJung-uk Kim     unsigned long dup_list = 0;
3487bded2dbSJung-uk Kim 
349c9cf7b5cSJung-uk Kim     if (ngroups == 0) {
350c9cf7b5cSJung-uk Kim         SSLerr(SSL_F_TLS1_SET_GROUPS, SSL_R_BAD_LENGTH);
351c9cf7b5cSJung-uk Kim         return 0;
352c9cf7b5cSJung-uk Kim     }
353e71b7053SJung-uk Kim     if ((glist = OPENSSL_malloc(ngroups * sizeof(*glist))) == NULL) {
354e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_GROUPS, ERR_R_MALLOC_FAILURE);
3557bded2dbSJung-uk Kim         return 0;
3567bded2dbSJung-uk Kim     }
357e71b7053SJung-uk Kim     for (i = 0; i < ngroups; i++) {
358e71b7053SJung-uk Kim         unsigned long idmask;
359e71b7053SJung-uk Kim         uint16_t id;
360e71b7053SJung-uk Kim         /* TODO(TLS1.3): Convert for DH groups */
361e71b7053SJung-uk Kim         id = tls1_nid2group_id(groups[i]);
3627bded2dbSJung-uk Kim         idmask = 1L << id;
3637bded2dbSJung-uk Kim         if (!id || (dup_list & idmask)) {
364e71b7053SJung-uk Kim             OPENSSL_free(glist);
3657bded2dbSJung-uk Kim             return 0;
3667bded2dbSJung-uk Kim         }
3677bded2dbSJung-uk Kim         dup_list |= idmask;
368e71b7053SJung-uk Kim         glist[i] = id;
3697bded2dbSJung-uk Kim     }
3707bded2dbSJung-uk Kim     OPENSSL_free(*pext);
371e71b7053SJung-uk Kim     *pext = glist;
372e71b7053SJung-uk Kim     *pextlen = ngroups;
3737bded2dbSJung-uk Kim     return 1;
3747bded2dbSJung-uk Kim }
3757bded2dbSJung-uk Kim 
376e71b7053SJung-uk Kim # define MAX_CURVELIST   OSSL_NELEM(nid_list)
3777bded2dbSJung-uk Kim 
3787bded2dbSJung-uk Kim typedef struct {
3797bded2dbSJung-uk Kim     size_t nidcnt;
3807bded2dbSJung-uk Kim     int nid_arr[MAX_CURVELIST];
3817bded2dbSJung-uk Kim } nid_cb_st;
3827bded2dbSJung-uk Kim 
3837bded2dbSJung-uk Kim static int nid_cb(const char *elem, int len, void *arg)
3847bded2dbSJung-uk Kim {
3857bded2dbSJung-uk Kim     nid_cb_st *narg = arg;
3867bded2dbSJung-uk Kim     size_t i;
3877bded2dbSJung-uk Kim     int nid;
3887bded2dbSJung-uk Kim     char etmp[20];
3897bded2dbSJung-uk Kim     if (elem == NULL)
3907bded2dbSJung-uk Kim         return 0;
3917bded2dbSJung-uk Kim     if (narg->nidcnt == MAX_CURVELIST)
3927bded2dbSJung-uk Kim         return 0;
3937bded2dbSJung-uk Kim     if (len > (int)(sizeof(etmp) - 1))
3947bded2dbSJung-uk Kim         return 0;
3957bded2dbSJung-uk Kim     memcpy(etmp, elem, len);
3967bded2dbSJung-uk Kim     etmp[len] = 0;
3977bded2dbSJung-uk Kim     nid = EC_curve_nist2nid(etmp);
3987bded2dbSJung-uk Kim     if (nid == NID_undef)
3997bded2dbSJung-uk Kim         nid = OBJ_sn2nid(etmp);
4007bded2dbSJung-uk Kim     if (nid == NID_undef)
4017bded2dbSJung-uk Kim         nid = OBJ_ln2nid(etmp);
4027bded2dbSJung-uk Kim     if (nid == NID_undef)
4037bded2dbSJung-uk Kim         return 0;
4047bded2dbSJung-uk Kim     for (i = 0; i < narg->nidcnt; i++)
4057bded2dbSJung-uk Kim         if (narg->nid_arr[i] == nid)
4067bded2dbSJung-uk Kim             return 0;
4077bded2dbSJung-uk Kim     narg->nid_arr[narg->nidcnt++] = nid;
4087bded2dbSJung-uk Kim     return 1;
4097bded2dbSJung-uk Kim }
4107bded2dbSJung-uk Kim 
411e71b7053SJung-uk Kim /* Set groups based on a colon separate list */
412e71b7053SJung-uk Kim int tls1_set_groups_list(uint16_t **pext, size_t *pextlen, const char *str)
4137bded2dbSJung-uk Kim {
4147bded2dbSJung-uk Kim     nid_cb_st ncb;
4157bded2dbSJung-uk Kim     ncb.nidcnt = 0;
4167bded2dbSJung-uk Kim     if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
4177bded2dbSJung-uk Kim         return 0;
4187bded2dbSJung-uk Kim     if (pext == NULL)
4197bded2dbSJung-uk Kim         return 1;
420e71b7053SJung-uk Kim     return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
4217bded2dbSJung-uk Kim }
422e71b7053SJung-uk Kim /* Return group id of a key */
423e71b7053SJung-uk Kim static uint16_t tls1_get_group_id(EVP_PKEY *pkey)
4247bded2dbSJung-uk Kim {
425e71b7053SJung-uk Kim     EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
4267bded2dbSJung-uk Kim     const EC_GROUP *grp;
427e71b7053SJung-uk Kim 
428e71b7053SJung-uk Kim     if (ec == NULL)
4297bded2dbSJung-uk Kim         return 0;
4307bded2dbSJung-uk Kim     grp = EC_KEY_get0_group(ec);
431e71b7053SJung-uk Kim     return tls1_nid2group_id(EC_GROUP_get_curve_name(grp));
4327bded2dbSJung-uk Kim }
4337bded2dbSJung-uk Kim 
434e71b7053SJung-uk Kim /* Check a key is compatible with compression extension */
435e71b7053SJung-uk Kim static int tls1_check_pkey_comp(SSL *s, EVP_PKEY *pkey)
4367bded2dbSJung-uk Kim {
437e71b7053SJung-uk Kim     const EC_KEY *ec;
438e71b7053SJung-uk Kim     const EC_GROUP *grp;
439e71b7053SJung-uk Kim     unsigned char comp_id;
440e71b7053SJung-uk Kim     size_t i;
441e71b7053SJung-uk Kim 
442e71b7053SJung-uk Kim     /* If not an EC key nothing to check */
443e71b7053SJung-uk Kim     if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
444e71b7053SJung-uk Kim         return 1;
445e71b7053SJung-uk Kim     ec = EVP_PKEY_get0_EC_KEY(pkey);
446e71b7053SJung-uk Kim     grp = EC_KEY_get0_group(ec);
447e71b7053SJung-uk Kim 
448e71b7053SJung-uk Kim     /* Get required compression id */
449e71b7053SJung-uk Kim     if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
450e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
451e71b7053SJung-uk Kim     } else if (SSL_IS_TLS13(s)) {
452e71b7053SJung-uk Kim             /*
453e71b7053SJung-uk Kim              * ec_point_formats extension is not used in TLSv1.3 so we ignore
454e71b7053SJung-uk Kim              * this check.
455e71b7053SJung-uk Kim              */
456e71b7053SJung-uk Kim             return 1;
457e71b7053SJung-uk Kim     } else {
458e71b7053SJung-uk Kim         int field_type = EC_METHOD_get_field_type(EC_GROUP_method_of(grp));
459e71b7053SJung-uk Kim 
460e71b7053SJung-uk Kim         if (field_type == NID_X9_62_prime_field)
461e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
462e71b7053SJung-uk Kim         else if (field_type == NID_X9_62_characteristic_two_field)
463e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
464e71b7053SJung-uk Kim         else
465e71b7053SJung-uk Kim             return 0;
466e71b7053SJung-uk Kim     }
4677bded2dbSJung-uk Kim     /*
4687bded2dbSJung-uk Kim      * If point formats extension present check it, otherwise everything is
4697bded2dbSJung-uk Kim      * supported (see RFC4492).
4707bded2dbSJung-uk Kim      */
471da327cd2SJung-uk Kim     if (s->ext.peer_ecpointformats == NULL)
4727bded2dbSJung-uk Kim         return 1;
473e71b7053SJung-uk Kim 
474da327cd2SJung-uk Kim     for (i = 0; i < s->ext.peer_ecpointformats_len; i++) {
475da327cd2SJung-uk Kim         if (s->ext.peer_ecpointformats[i] == comp_id)
4767bded2dbSJung-uk Kim             return 1;
4777bded2dbSJung-uk Kim     }
478e71b7053SJung-uk Kim     return 0;
4797bded2dbSJung-uk Kim }
4807bded2dbSJung-uk Kim 
481e71b7053SJung-uk Kim /* Check a group id matches preferences */
482e71b7053SJung-uk Kim int tls1_check_group_id(SSL *s, uint16_t group_id, int check_own_groups)
483e71b7053SJung-uk Kim     {
484e71b7053SJung-uk Kim     const uint16_t *groups;
485e71b7053SJung-uk Kim     size_t groups_len;
486e71b7053SJung-uk Kim 
487e71b7053SJung-uk Kim     if (group_id == 0)
488e71b7053SJung-uk Kim         return 0;
489e71b7053SJung-uk Kim 
490e71b7053SJung-uk Kim     /* Check for Suite B compliance */
491e71b7053SJung-uk Kim     if (tls1_suiteb(s) && s->s3->tmp.new_cipher != NULL) {
492e71b7053SJung-uk Kim         unsigned long cid = s->s3->tmp.new_cipher->id;
493e71b7053SJung-uk Kim 
494e71b7053SJung-uk Kim         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
495e71b7053SJung-uk Kim             if (group_id != TLSEXT_curve_P_256)
496e71b7053SJung-uk Kim                 return 0;
497e71b7053SJung-uk Kim         } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
498e71b7053SJung-uk Kim             if (group_id != TLSEXT_curve_P_384)
499e71b7053SJung-uk Kim                 return 0;
500e71b7053SJung-uk Kim         } else {
501e71b7053SJung-uk Kim             /* Should never happen */
502e71b7053SJung-uk Kim             return 0;
503e71b7053SJung-uk Kim         }
504e71b7053SJung-uk Kim     }
505e71b7053SJung-uk Kim 
506e71b7053SJung-uk Kim     if (check_own_groups) {
507e71b7053SJung-uk Kim         /* Check group is one of our preferences */
508e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &groups, &groups_len);
509e71b7053SJung-uk Kim         if (!tls1_in_list(group_id, groups, groups_len))
510e71b7053SJung-uk Kim             return 0;
511e71b7053SJung-uk Kim     }
512e71b7053SJung-uk Kim 
513e71b7053SJung-uk Kim     if (!tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_CHECK))
514e71b7053SJung-uk Kim         return 0;
515e71b7053SJung-uk Kim 
516e71b7053SJung-uk Kim     /* For clients, nothing more to check */
517e71b7053SJung-uk Kim     if (!s->server)
518e71b7053SJung-uk Kim         return 1;
519e71b7053SJung-uk Kim 
520e71b7053SJung-uk Kim     /* Check group is one of peers preferences */
521e71b7053SJung-uk Kim     tls1_get_peer_groups(s, &groups, &groups_len);
522e71b7053SJung-uk Kim 
523e71b7053SJung-uk Kim     /*
524e71b7053SJung-uk Kim      * RFC 4492 does not require the supported elliptic curves extension
525e71b7053SJung-uk Kim      * so if it is not sent we can just choose any curve.
526e71b7053SJung-uk Kim      * It is invalid to send an empty list in the supported groups
527e71b7053SJung-uk Kim      * extension, so groups_len == 0 always means no extension.
528e71b7053SJung-uk Kim      */
529e71b7053SJung-uk Kim     if (groups_len == 0)
530e71b7053SJung-uk Kim             return 1;
531e71b7053SJung-uk Kim     return tls1_in_list(group_id, groups, groups_len);
532e71b7053SJung-uk Kim }
533e71b7053SJung-uk Kim 
534e71b7053SJung-uk Kim void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
5357bded2dbSJung-uk Kim                          size_t *num_formats)
5367bded2dbSJung-uk Kim {
5377bded2dbSJung-uk Kim     /*
5387bded2dbSJung-uk Kim      * If we have a custom point format list use it otherwise use default
5397bded2dbSJung-uk Kim      */
540e71b7053SJung-uk Kim     if (s->ext.ecpointformats) {
541e71b7053SJung-uk Kim         *pformats = s->ext.ecpointformats;
542e71b7053SJung-uk Kim         *num_formats = s->ext.ecpointformats_len;
5437bded2dbSJung-uk Kim     } else {
5447bded2dbSJung-uk Kim         *pformats = ecformats_default;
5457bded2dbSJung-uk Kim         /* For Suite B we don't support char2 fields */
5467bded2dbSJung-uk Kim         if (tls1_suiteb(s))
5477bded2dbSJung-uk Kim             *num_formats = sizeof(ecformats_default) - 1;
5487bded2dbSJung-uk Kim         else
5497bded2dbSJung-uk Kim             *num_formats = sizeof(ecformats_default);
5507bded2dbSJung-uk Kim     }
5517bded2dbSJung-uk Kim }
5527bded2dbSJung-uk Kim 
5537bded2dbSJung-uk Kim /*
5547bded2dbSJung-uk Kim  * Check cert parameters compatible with extensions: currently just checks EC
5557bded2dbSJung-uk Kim  * certificates have compatible curves and compression.
5567bded2dbSJung-uk Kim  */
557e71b7053SJung-uk Kim static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
5587bded2dbSJung-uk Kim {
559e71b7053SJung-uk Kim     uint16_t group_id;
5607bded2dbSJung-uk Kim     EVP_PKEY *pkey;
561e71b7053SJung-uk Kim     pkey = X509_get0_pubkey(x);
562e71b7053SJung-uk Kim     if (pkey == NULL)
5637bded2dbSJung-uk Kim         return 0;
5647bded2dbSJung-uk Kim     /* If not EC nothing to do */
565e71b7053SJung-uk Kim     if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
5667bded2dbSJung-uk Kim         return 1;
567e71b7053SJung-uk Kim     /* Check compression */
568e71b7053SJung-uk Kim     if (!tls1_check_pkey_comp(s, pkey))
5697bded2dbSJung-uk Kim         return 0;
570e71b7053SJung-uk Kim     group_id = tls1_get_group_id(pkey);
5717bded2dbSJung-uk Kim     /*
572e71b7053SJung-uk Kim      * For a server we allow the certificate to not be in our list of supported
573e71b7053SJung-uk Kim      * groups.
5747bded2dbSJung-uk Kim      */
575e71b7053SJung-uk Kim     if (!tls1_check_group_id(s, group_id, !s->server))
5767bded2dbSJung-uk Kim         return 0;
5777bded2dbSJung-uk Kim     /*
5787bded2dbSJung-uk Kim      * Special case for suite B. We *MUST* sign using SHA256+P-256 or
579e71b7053SJung-uk Kim      * SHA384+P-384.
5807bded2dbSJung-uk Kim      */
581e71b7053SJung-uk Kim     if (check_ee_md && tls1_suiteb(s)) {
5827bded2dbSJung-uk Kim         int check_md;
5837bded2dbSJung-uk Kim         size_t i;
584e71b7053SJung-uk Kim 
5857bded2dbSJung-uk Kim         /* Check to see we have necessary signing algorithm */
586e71b7053SJung-uk Kim         if (group_id == TLSEXT_curve_P_256)
5877bded2dbSJung-uk Kim             check_md = NID_ecdsa_with_SHA256;
588e71b7053SJung-uk Kim         else if (group_id == TLSEXT_curve_P_384)
5897bded2dbSJung-uk Kim             check_md = NID_ecdsa_with_SHA384;
5907bded2dbSJung-uk Kim         else
5917bded2dbSJung-uk Kim             return 0;           /* Should never happen */
592da327cd2SJung-uk Kim         for (i = 0; i < s->shared_sigalgslen; i++) {
593da327cd2SJung-uk Kim             if (check_md == s->shared_sigalgs[i]->sigandhash)
594e71b7053SJung-uk Kim                 return 1;;
595e71b7053SJung-uk Kim         }
5967bded2dbSJung-uk Kim         return 0;
5977bded2dbSJung-uk Kim     }
598e71b7053SJung-uk Kim     return 1;
5997bded2dbSJung-uk Kim }
6007bded2dbSJung-uk Kim 
601e71b7053SJung-uk Kim /*
602e71b7053SJung-uk Kim  * tls1_check_ec_tmp_key - Check EC temporary key compatibility
603e71b7053SJung-uk Kim  * @s: SSL connection
604e71b7053SJung-uk Kim  * @cid: Cipher ID we're considering using
605e71b7053SJung-uk Kim  *
606e71b7053SJung-uk Kim  * Checks that the kECDHE cipher suite we're considering using
607e71b7053SJung-uk Kim  * is compatible with the client extensions.
608e71b7053SJung-uk Kim  *
609e71b7053SJung-uk Kim  * Returns 0 when the cipher can't be used or 1 when it can.
610e71b7053SJung-uk Kim  */
6117bded2dbSJung-uk Kim int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
6127bded2dbSJung-uk Kim {
613e71b7053SJung-uk Kim     /* If not Suite B just need a shared group */
614e71b7053SJung-uk Kim     if (!tls1_suiteb(s))
615e71b7053SJung-uk Kim         return tls1_shared_group(s, 0) != 0;
6167bded2dbSJung-uk Kim     /*
6177bded2dbSJung-uk Kim      * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
6187bded2dbSJung-uk Kim      * curves permitted.
6197bded2dbSJung-uk Kim      */
6207bded2dbSJung-uk Kim     if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
621e71b7053SJung-uk Kim         return tls1_check_group_id(s, TLSEXT_curve_P_256, 1);
622e71b7053SJung-uk Kim     if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
623e71b7053SJung-uk Kim         return tls1_check_group_id(s, TLSEXT_curve_P_384, 1);
6247bded2dbSJung-uk Kim 
6257bded2dbSJung-uk Kim     return 0;
6267bded2dbSJung-uk Kim }
6277bded2dbSJung-uk Kim 
6287bded2dbSJung-uk Kim #else
6297bded2dbSJung-uk Kim 
6307bded2dbSJung-uk Kim static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
6317bded2dbSJung-uk Kim {
6327bded2dbSJung-uk Kim     return 1;
6337bded2dbSJung-uk Kim }
6347bded2dbSJung-uk Kim 
6351f13597dSJung-uk Kim #endif                          /* OPENSSL_NO_EC */
636db522d3aSSimon L. B. Nielsen 
637e71b7053SJung-uk Kim /* Default sigalg schemes */
638e71b7053SJung-uk Kim static const uint16_t tls12_sigalgs[] = {
639e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
640e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
641e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
642e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
643e71b7053SJung-uk Kim     TLSEXT_SIGALG_ed25519,
644e71b7053SJung-uk Kim     TLSEXT_SIGALG_ed448,
645e71b7053SJung-uk Kim #endif
646e71b7053SJung-uk Kim 
647e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha256,
648e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha384,
649e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha512,
650e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha256,
651e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha384,
652e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha512,
653e71b7053SJung-uk Kim 
654e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha256,
655e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha384,
656e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha512,
657e71b7053SJung-uk Kim 
658e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
659e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha224,
660e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha1,
661e71b7053SJung-uk Kim #endif
662e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha224,
663e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha1,
664e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DSA
665e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha224,
666e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha1,
667e71b7053SJung-uk Kim 
668e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha256,
669e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha384,
670e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha512,
671e71b7053SJung-uk Kim #endif
672e71b7053SJung-uk Kim #ifndef OPENSSL_NO_GOST
673e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
674e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
675e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102001_gostr3411,
676e71b7053SJung-uk Kim #endif
677e71b7053SJung-uk Kim };
678e71b7053SJung-uk Kim 
679e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
680e71b7053SJung-uk Kim static const uint16_t suiteb_sigalgs[] = {
681e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
682e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp384r1_sha384
683e71b7053SJung-uk Kim };
684e71b7053SJung-uk Kim #endif
685e71b7053SJung-uk Kim 
686e71b7053SJung-uk Kim static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
687e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
688e71b7053SJung-uk Kim     {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
689e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
690e71b7053SJung-uk Kim      NID_ecdsa_with_SHA256, NID_X9_62_prime256v1},
691e71b7053SJung-uk Kim     {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
692e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
693e71b7053SJung-uk Kim      NID_ecdsa_with_SHA384, NID_secp384r1},
694e71b7053SJung-uk Kim     {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
695e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
696e71b7053SJung-uk Kim      NID_ecdsa_with_SHA512, NID_secp521r1},
697e71b7053SJung-uk Kim     {"ed25519", TLSEXT_SIGALG_ed25519,
698e71b7053SJung-uk Kim      NID_undef, -1, EVP_PKEY_ED25519, SSL_PKEY_ED25519,
699e71b7053SJung-uk Kim      NID_undef, NID_undef},
700e71b7053SJung-uk Kim     {"ed448", TLSEXT_SIGALG_ed448,
701e71b7053SJung-uk Kim      NID_undef, -1, EVP_PKEY_ED448, SSL_PKEY_ED448,
702e71b7053SJung-uk Kim      NID_undef, NID_undef},
703e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_ecdsa_sha224,
704e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
705e71b7053SJung-uk Kim      NID_ecdsa_with_SHA224, NID_undef},
706e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_ecdsa_sha1,
707e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
708e71b7053SJung-uk Kim      NID_ecdsa_with_SHA1, NID_undef},
709e71b7053SJung-uk Kim #endif
710e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha256", TLSEXT_SIGALG_rsa_pss_rsae_sha256,
711e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
712e71b7053SJung-uk Kim      NID_undef, NID_undef},
713e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha384", TLSEXT_SIGALG_rsa_pss_rsae_sha384,
714e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
715e71b7053SJung-uk Kim      NID_undef, NID_undef},
716e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha512", TLSEXT_SIGALG_rsa_pss_rsae_sha512,
717e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
718e71b7053SJung-uk Kim      NID_undef, NID_undef},
719e71b7053SJung-uk Kim     {"rsa_pss_pss_sha256", TLSEXT_SIGALG_rsa_pss_pss_sha256,
720e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
721e71b7053SJung-uk Kim      NID_undef, NID_undef},
722e71b7053SJung-uk Kim     {"rsa_pss_pss_sha384", TLSEXT_SIGALG_rsa_pss_pss_sha384,
723e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
724e71b7053SJung-uk Kim      NID_undef, NID_undef},
725e71b7053SJung-uk Kim     {"rsa_pss_pss_sha512", TLSEXT_SIGALG_rsa_pss_pss_sha512,
726e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
727e71b7053SJung-uk Kim      NID_undef, NID_undef},
728e71b7053SJung-uk Kim     {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
729e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
730e71b7053SJung-uk Kim      NID_sha256WithRSAEncryption, NID_undef},
731e71b7053SJung-uk Kim     {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
732e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
733e71b7053SJung-uk Kim      NID_sha384WithRSAEncryption, NID_undef},
734e71b7053SJung-uk Kim     {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
735e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
736e71b7053SJung-uk Kim      NID_sha512WithRSAEncryption, NID_undef},
737e71b7053SJung-uk Kim     {"rsa_pkcs1_sha224", TLSEXT_SIGALG_rsa_pkcs1_sha224,
738e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
739e71b7053SJung-uk Kim      NID_sha224WithRSAEncryption, NID_undef},
740e71b7053SJung-uk Kim     {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
741e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
742e71b7053SJung-uk Kim      NID_sha1WithRSAEncryption, NID_undef},
743e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DSA
744e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha256,
745e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
746e71b7053SJung-uk Kim      NID_dsa_with_SHA256, NID_undef},
747e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha384,
748e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
749e71b7053SJung-uk Kim      NID_undef, NID_undef},
750e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha512,
751e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
752e71b7053SJung-uk Kim      NID_undef, NID_undef},
753e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha224,
754e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
755e71b7053SJung-uk Kim      NID_undef, NID_undef},
756e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha1,
757e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
758e71b7053SJung-uk Kim      NID_dsaWithSHA1, NID_undef},
759e71b7053SJung-uk Kim #endif
760e71b7053SJung-uk Kim #ifndef OPENSSL_NO_GOST
761e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
762e71b7053SJung-uk Kim      NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
763e71b7053SJung-uk Kim      NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
764e71b7053SJung-uk Kim      NID_undef, NID_undef},
765e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
766e71b7053SJung-uk Kim      NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
767e71b7053SJung-uk Kim      NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
768e71b7053SJung-uk Kim      NID_undef, NID_undef},
769e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
770e71b7053SJung-uk Kim      NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
771e71b7053SJung-uk Kim      NID_id_GostR3410_2001, SSL_PKEY_GOST01,
772e71b7053SJung-uk Kim      NID_undef, NID_undef}
773e71b7053SJung-uk Kim #endif
774e71b7053SJung-uk Kim };
775e71b7053SJung-uk Kim /* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
776e71b7053SJung-uk Kim static const SIGALG_LOOKUP legacy_rsa_sigalg = {
777e71b7053SJung-uk Kim     "rsa_pkcs1_md5_sha1", 0,
778e71b7053SJung-uk Kim      NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
779e71b7053SJung-uk Kim      EVP_PKEY_RSA, SSL_PKEY_RSA,
780e71b7053SJung-uk Kim      NID_undef, NID_undef
781e71b7053SJung-uk Kim };
7821f13597dSJung-uk Kim 
7836f9291ceSJung-uk Kim /*
784e71b7053SJung-uk Kim  * Default signature algorithm values used if signature algorithms not present.
785e71b7053SJung-uk Kim  * From RFC5246. Note: order must match certificate index order.
7861f13597dSJung-uk Kim  */
787e71b7053SJung-uk Kim static const uint16_t tls_default_sigalg[] = {
788e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
789e71b7053SJung-uk Kim     0, /* SSL_PKEY_RSA_PSS_SIGN */
790e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
791e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
792e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
793e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256, /* SSL_PKEY_GOST12_256 */
794e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512, /* SSL_PKEY_GOST12_512 */
795e71b7053SJung-uk Kim     0, /* SSL_PKEY_ED25519 */
796e71b7053SJung-uk Kim     0, /* SSL_PKEY_ED448 */
7971f13597dSJung-uk Kim };
7981f13597dSJung-uk Kim 
799e71b7053SJung-uk Kim /* Lookup TLS signature algorithm */
800e71b7053SJung-uk Kim static const SIGALG_LOOKUP *tls1_lookup_sigalg(uint16_t sigalg)
801e71b7053SJung-uk Kim {
802e71b7053SJung-uk Kim     size_t i;
803e71b7053SJung-uk Kim     const SIGALG_LOOKUP *s;
804e71b7053SJung-uk Kim 
805e71b7053SJung-uk Kim     for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
806e71b7053SJung-uk Kim          i++, s++) {
807e71b7053SJung-uk Kim         if (s->sigalg == sigalg)
808e71b7053SJung-uk Kim             return s;
809e71b7053SJung-uk Kim     }
810e71b7053SJung-uk Kim     return NULL;
811e71b7053SJung-uk Kim }
812e71b7053SJung-uk Kim /* Lookup hash: return 0 if invalid or not enabled */
813e71b7053SJung-uk Kim int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd)
814e71b7053SJung-uk Kim {
815e71b7053SJung-uk Kim     const EVP_MD *md;
816e71b7053SJung-uk Kim     if (lu == NULL)
817e71b7053SJung-uk Kim         return 0;
818e71b7053SJung-uk Kim     /* lu->hash == NID_undef means no associated digest */
819e71b7053SJung-uk Kim     if (lu->hash == NID_undef) {
820e71b7053SJung-uk Kim         md = NULL;
821e71b7053SJung-uk Kim     } else {
822e71b7053SJung-uk Kim         md = ssl_md(lu->hash_idx);
823e71b7053SJung-uk Kim         if (md == NULL)
824e71b7053SJung-uk Kim             return 0;
825e71b7053SJung-uk Kim     }
826e71b7053SJung-uk Kim     if (pmd)
827e71b7053SJung-uk Kim         *pmd = md;
828e71b7053SJung-uk Kim     return 1;
829e71b7053SJung-uk Kim }
830e71b7053SJung-uk Kim 
831e71b7053SJung-uk Kim /*
832e71b7053SJung-uk Kim  * Check if key is large enough to generate RSA-PSS signature.
833e71b7053SJung-uk Kim  *
834e71b7053SJung-uk Kim  * The key must greater than or equal to 2 * hash length + 2.
835e71b7053SJung-uk Kim  * SHA512 has a hash length of 64 bytes, which is incompatible
836e71b7053SJung-uk Kim  * with a 128 byte (1024 bit) key.
837e71b7053SJung-uk Kim  */
838e71b7053SJung-uk Kim #define RSA_PSS_MINIMUM_KEY_SIZE(md) (2 * EVP_MD_size(md) + 2)
839e71b7053SJung-uk Kim static int rsa_pss_check_min_key_size(const RSA *rsa, const SIGALG_LOOKUP *lu)
840e71b7053SJung-uk Kim {
841e71b7053SJung-uk Kim     const EVP_MD *md;
842e71b7053SJung-uk Kim 
843e71b7053SJung-uk Kim     if (rsa == NULL)
844e71b7053SJung-uk Kim         return 0;
845e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, &md) || md == NULL)
846e71b7053SJung-uk Kim         return 0;
847e71b7053SJung-uk Kim     if (RSA_size(rsa) < RSA_PSS_MINIMUM_KEY_SIZE(md))
848e71b7053SJung-uk Kim         return 0;
849e71b7053SJung-uk Kim     return 1;
850e71b7053SJung-uk Kim }
851e71b7053SJung-uk Kim 
852e71b7053SJung-uk Kim /*
853*17f01e99SJung-uk Kim  * Returns a signature algorithm when the peer did not send a list of supported
854*17f01e99SJung-uk Kim  * signature algorithms. The signature algorithm is fixed for the certificate
855*17f01e99SJung-uk Kim  * type. |idx| is a certificate type index (SSL_PKEY_*). When |idx| is -1 the
856*17f01e99SJung-uk Kim  * certificate type from |s| will be used.
857*17f01e99SJung-uk Kim  * Returns the signature algorithm to use, or NULL on error.
858e71b7053SJung-uk Kim  */
859e71b7053SJung-uk Kim static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
860e71b7053SJung-uk Kim {
861e71b7053SJung-uk Kim     if (idx == -1) {
862e71b7053SJung-uk Kim         if (s->server) {
863e71b7053SJung-uk Kim             size_t i;
864e71b7053SJung-uk Kim 
865e71b7053SJung-uk Kim             /* Work out index corresponding to ciphersuite */
866e71b7053SJung-uk Kim             for (i = 0; i < SSL_PKEY_NUM; i++) {
867e71b7053SJung-uk Kim                 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(i);
868e71b7053SJung-uk Kim 
869e71b7053SJung-uk Kim                 if (clu->amask & s->s3->tmp.new_cipher->algorithm_auth) {
870e71b7053SJung-uk Kim                     idx = i;
871e71b7053SJung-uk Kim                     break;
872e71b7053SJung-uk Kim                 }
873e71b7053SJung-uk Kim             }
874e71b7053SJung-uk Kim 
875e71b7053SJung-uk Kim             /*
876e71b7053SJung-uk Kim              * Some GOST ciphersuites allow more than one signature algorithms
877e71b7053SJung-uk Kim              * */
878e71b7053SJung-uk Kim             if (idx == SSL_PKEY_GOST01 && s->s3->tmp.new_cipher->algorithm_auth != SSL_aGOST01) {
879e71b7053SJung-uk Kim                 int real_idx;
880e71b7053SJung-uk Kim 
881e71b7053SJung-uk Kim                 for (real_idx = SSL_PKEY_GOST12_512; real_idx >= SSL_PKEY_GOST01;
882e71b7053SJung-uk Kim                      real_idx--) {
883e71b7053SJung-uk Kim                     if (s->cert->pkeys[real_idx].privatekey != NULL) {
884e71b7053SJung-uk Kim                         idx = real_idx;
885e71b7053SJung-uk Kim                         break;
886e71b7053SJung-uk Kim                     }
887e71b7053SJung-uk Kim                 }
888e71b7053SJung-uk Kim             }
889e71b7053SJung-uk Kim         } else {
890e71b7053SJung-uk Kim             idx = s->cert->key - s->cert->pkeys;
891e71b7053SJung-uk Kim         }
892e71b7053SJung-uk Kim     }
893e71b7053SJung-uk Kim     if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
894e71b7053SJung-uk Kim         return NULL;
895e71b7053SJung-uk Kim     if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
896e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(tls_default_sigalg[idx]);
897e71b7053SJung-uk Kim 
898e71b7053SJung-uk Kim         if (!tls1_lookup_md(lu, NULL))
899e71b7053SJung-uk Kim             return NULL;
900*17f01e99SJung-uk Kim         if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
901*17f01e99SJung-uk Kim             return NULL;
902e71b7053SJung-uk Kim         return lu;
903e71b7053SJung-uk Kim     }
904*17f01e99SJung-uk Kim     if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, &legacy_rsa_sigalg))
905*17f01e99SJung-uk Kim         return NULL;
906e71b7053SJung-uk Kim     return &legacy_rsa_sigalg;
907e71b7053SJung-uk Kim }
908e71b7053SJung-uk Kim /* Set peer sigalg based key type */
909e71b7053SJung-uk Kim int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
910e71b7053SJung-uk Kim {
911e71b7053SJung-uk Kim     size_t idx;
912e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
913e71b7053SJung-uk Kim 
914e71b7053SJung-uk Kim     if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
915e71b7053SJung-uk Kim         return 0;
916e71b7053SJung-uk Kim     lu = tls1_get_legacy_sigalg(s, idx);
917e71b7053SJung-uk Kim     if (lu == NULL)
918e71b7053SJung-uk Kim         return 0;
919e71b7053SJung-uk Kim     s->s3->tmp.peer_sigalg = lu;
920e71b7053SJung-uk Kim     return 1;
921e71b7053SJung-uk Kim }
922e71b7053SJung-uk Kim 
923e71b7053SJung-uk Kim size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
9241f13597dSJung-uk Kim {
9257bded2dbSJung-uk Kim     /*
9267bded2dbSJung-uk Kim      * If Suite B mode use Suite B sigalgs only, ignore any other
9277bded2dbSJung-uk Kim      * preferences.
9287bded2dbSJung-uk Kim      */
9297bded2dbSJung-uk Kim #ifndef OPENSSL_NO_EC
9307bded2dbSJung-uk Kim     switch (tls1_suiteb(s)) {
9317bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS:
9327bded2dbSJung-uk Kim         *psigs = suiteb_sigalgs;
933e71b7053SJung-uk Kim         return OSSL_NELEM(suiteb_sigalgs);
9347bded2dbSJung-uk Kim 
9357bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
9367bded2dbSJung-uk Kim         *psigs = suiteb_sigalgs;
937e71b7053SJung-uk Kim         return 1;
9387bded2dbSJung-uk Kim 
9397bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_192_LOS:
940e71b7053SJung-uk Kim         *psigs = suiteb_sigalgs + 1;
941e71b7053SJung-uk Kim         return 1;
9427bded2dbSJung-uk Kim     }
9437bded2dbSJung-uk Kim #endif
944e71b7053SJung-uk Kim     /*
945e71b7053SJung-uk Kim      *  We use client_sigalgs (if not NULL) if we're a server
946e71b7053SJung-uk Kim      *  and sending a certificate request or if we're a client and
947e71b7053SJung-uk Kim      *  determining which shared algorithm to use.
948e71b7053SJung-uk Kim      */
949e71b7053SJung-uk Kim     if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
9507bded2dbSJung-uk Kim         *psigs = s->cert->client_sigalgs;
9517bded2dbSJung-uk Kim         return s->cert->client_sigalgslen;
9527bded2dbSJung-uk Kim     } else if (s->cert->conf_sigalgs) {
9537bded2dbSJung-uk Kim         *psigs = s->cert->conf_sigalgs;
9547bded2dbSJung-uk Kim         return s->cert->conf_sigalgslen;
9557bded2dbSJung-uk Kim     } else {
9567bded2dbSJung-uk Kim         *psigs = tls12_sigalgs;
957e71b7053SJung-uk Kim         return OSSL_NELEM(tls12_sigalgs);
9587bded2dbSJung-uk Kim     }
9597bded2dbSJung-uk Kim }
9607bded2dbSJung-uk Kim 
961c9cf7b5cSJung-uk Kim #ifndef OPENSSL_NO_EC
962c9cf7b5cSJung-uk Kim /*
963c9cf7b5cSJung-uk Kim  * Called by servers only. Checks that we have a sig alg that supports the
964c9cf7b5cSJung-uk Kim  * specified EC curve.
965c9cf7b5cSJung-uk Kim  */
966c9cf7b5cSJung-uk Kim int tls_check_sigalg_curve(const SSL *s, int curve)
967c9cf7b5cSJung-uk Kim {
968c9cf7b5cSJung-uk Kim    const uint16_t *sigs;
969c9cf7b5cSJung-uk Kim    size_t siglen, i;
970c9cf7b5cSJung-uk Kim 
971c9cf7b5cSJung-uk Kim     if (s->cert->conf_sigalgs) {
972c9cf7b5cSJung-uk Kim         sigs = s->cert->conf_sigalgs;
973c9cf7b5cSJung-uk Kim         siglen = s->cert->conf_sigalgslen;
974c9cf7b5cSJung-uk Kim     } else {
975c9cf7b5cSJung-uk Kim         sigs = tls12_sigalgs;
976c9cf7b5cSJung-uk Kim         siglen = OSSL_NELEM(tls12_sigalgs);
977c9cf7b5cSJung-uk Kim     }
978c9cf7b5cSJung-uk Kim 
979c9cf7b5cSJung-uk Kim     for (i = 0; i < siglen; i++) {
980c9cf7b5cSJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(sigs[i]);
981c9cf7b5cSJung-uk Kim 
982c9cf7b5cSJung-uk Kim         if (lu == NULL)
983c9cf7b5cSJung-uk Kim             continue;
984c9cf7b5cSJung-uk Kim         if (lu->sig == EVP_PKEY_EC
985c9cf7b5cSJung-uk Kim                 && lu->curve != NID_undef
986c9cf7b5cSJung-uk Kim                 && curve == lu->curve)
987c9cf7b5cSJung-uk Kim             return 1;
988c9cf7b5cSJung-uk Kim     }
989c9cf7b5cSJung-uk Kim 
990c9cf7b5cSJung-uk Kim     return 0;
991c9cf7b5cSJung-uk Kim }
992c9cf7b5cSJung-uk Kim #endif
993c9cf7b5cSJung-uk Kim 
9947bded2dbSJung-uk Kim /*
995*17f01e99SJung-uk Kim  * Return the number of security bits for the signature algorithm, or 0 on
996*17f01e99SJung-uk Kim  * error.
997*17f01e99SJung-uk Kim  */
998*17f01e99SJung-uk Kim static int sigalg_security_bits(const SIGALG_LOOKUP *lu)
999*17f01e99SJung-uk Kim {
1000*17f01e99SJung-uk Kim     const EVP_MD *md = NULL;
1001*17f01e99SJung-uk Kim     int secbits = 0;
1002*17f01e99SJung-uk Kim 
1003*17f01e99SJung-uk Kim     if (!tls1_lookup_md(lu, &md))
1004*17f01e99SJung-uk Kim         return 0;
1005*17f01e99SJung-uk Kim     if (md != NULL)
1006*17f01e99SJung-uk Kim     {
1007*17f01e99SJung-uk Kim         /* Security bits: half digest bits */
1008*17f01e99SJung-uk Kim         secbits = EVP_MD_size(md) * 4;
1009*17f01e99SJung-uk Kim     } else {
1010*17f01e99SJung-uk Kim         /* Values from https://tools.ietf.org/html/rfc8032#section-8.5 */
1011*17f01e99SJung-uk Kim         if (lu->sigalg == TLSEXT_SIGALG_ed25519)
1012*17f01e99SJung-uk Kim             secbits = 128;
1013*17f01e99SJung-uk Kim         else if (lu->sigalg == TLSEXT_SIGALG_ed448)
1014*17f01e99SJung-uk Kim             secbits = 224;
1015*17f01e99SJung-uk Kim     }
1016*17f01e99SJung-uk Kim     return secbits;
1017*17f01e99SJung-uk Kim }
1018*17f01e99SJung-uk Kim 
1019*17f01e99SJung-uk Kim /*
10207bded2dbSJung-uk Kim  * Check signature algorithm is consistent with sent supported signature
1021e71b7053SJung-uk Kim  * algorithms and if so set relevant digest and signature scheme in
1022e71b7053SJung-uk Kim  * s.
10237bded2dbSJung-uk Kim  */
1024e71b7053SJung-uk Kim int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
10257bded2dbSJung-uk Kim {
1026e71b7053SJung-uk Kim     const uint16_t *sent_sigs;
1027e71b7053SJung-uk Kim     const EVP_MD *md = NULL;
1028e71b7053SJung-uk Kim     char sigalgstr[2];
1029e71b7053SJung-uk Kim     size_t sent_sigslen, i, cidx;
1030e71b7053SJung-uk Kim     int pkeyid = EVP_PKEY_id(pkey);
1031e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
1032*17f01e99SJung-uk Kim     int secbits = 0;
1033e71b7053SJung-uk Kim 
10347bded2dbSJung-uk Kim     /* Should never happen */
1035e71b7053SJung-uk Kim     if (pkeyid == -1)
10367bded2dbSJung-uk Kim         return -1;
1037e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s)) {
1038e71b7053SJung-uk Kim         /* Disallow DSA for TLS 1.3 */
1039e71b7053SJung-uk Kim         if (pkeyid == EVP_PKEY_DSA) {
1040e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1041e71b7053SJung-uk Kim                      SSL_R_WRONG_SIGNATURE_TYPE);
10427bded2dbSJung-uk Kim             return 0;
10437bded2dbSJung-uk Kim         }
1044e71b7053SJung-uk Kim         /* Only allow PSS for TLS 1.3 */
1045e71b7053SJung-uk Kim         if (pkeyid == EVP_PKEY_RSA)
1046e71b7053SJung-uk Kim             pkeyid = EVP_PKEY_RSA_PSS;
1047e71b7053SJung-uk Kim     }
1048e71b7053SJung-uk Kim     lu = tls1_lookup_sigalg(sig);
1049e71b7053SJung-uk Kim     /*
1050e71b7053SJung-uk Kim      * Check sigalgs is known. Disallow SHA1/SHA224 with TLS 1.3. Check key type
1051e71b7053SJung-uk Kim      * is consistent with signature: RSA keys can be used for RSA-PSS
1052e71b7053SJung-uk Kim      */
1053e71b7053SJung-uk Kim     if (lu == NULL
1054e71b7053SJung-uk Kim         || (SSL_IS_TLS13(s) && (lu->hash == NID_sha1 || lu->hash == NID_sha224))
1055e71b7053SJung-uk Kim         || (pkeyid != lu->sig
1056e71b7053SJung-uk Kim         && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
1057e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1058e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
1059e71b7053SJung-uk Kim         return 0;
1060e71b7053SJung-uk Kim     }
1061e71b7053SJung-uk Kim     /* Check the sigalg is consistent with the key OID */
1062e71b7053SJung-uk Kim     if (!ssl_cert_lookup_by_nid(EVP_PKEY_id(pkey), &cidx)
1063e71b7053SJung-uk Kim             || lu->sig_idx != (int)cidx) {
1064e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1065e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
1066e71b7053SJung-uk Kim         return 0;
1067e71b7053SJung-uk Kim     }
1068e71b7053SJung-uk Kim 
10697bded2dbSJung-uk Kim #ifndef OPENSSL_NO_EC
1070e71b7053SJung-uk Kim     if (pkeyid == EVP_PKEY_EC) {
1071e71b7053SJung-uk Kim 
1072e71b7053SJung-uk Kim         /* Check point compression is permitted */
1073e71b7053SJung-uk Kim         if (!tls1_check_pkey_comp(s, pkey)) {
1074e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1075e71b7053SJung-uk Kim                      SSL_F_TLS12_CHECK_PEER_SIGALG,
1076e71b7053SJung-uk Kim                      SSL_R_ILLEGAL_POINT_COMPRESSION);
10777bded2dbSJung-uk Kim             return 0;
10787bded2dbSJung-uk Kim         }
1079e71b7053SJung-uk Kim 
1080e71b7053SJung-uk Kim         /* For TLS 1.3 or Suite B check curve matches signature algorithm */
1081e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s) || tls1_suiteb(s)) {
1082e71b7053SJung-uk Kim             EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
1083e71b7053SJung-uk Kim             int curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
1084e71b7053SJung-uk Kim 
1085e71b7053SJung-uk Kim             if (lu->curve != NID_undef && curve != lu->curve) {
1086e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1087e71b7053SJung-uk Kim                          SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
1088e71b7053SJung-uk Kim                 return 0;
1089e71b7053SJung-uk Kim             }
1090e71b7053SJung-uk Kim         }
1091e71b7053SJung-uk Kim         if (!SSL_IS_TLS13(s)) {
1092e71b7053SJung-uk Kim             /* Check curve matches extensions */
1093e71b7053SJung-uk Kim             if (!tls1_check_group_id(s, tls1_get_group_id(pkey), 1)) {
1094e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1095e71b7053SJung-uk Kim                          SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
1096e71b7053SJung-uk Kim                 return 0;
1097e71b7053SJung-uk Kim             }
10987bded2dbSJung-uk Kim             if (tls1_suiteb(s)) {
1099e71b7053SJung-uk Kim                 /* Check sigalg matches a permissible Suite B value */
1100e71b7053SJung-uk Kim                 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
1101e71b7053SJung-uk Kim                     && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
1102e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1103e71b7053SJung-uk Kim                              SSL_F_TLS12_CHECK_PEER_SIGALG,
1104e71b7053SJung-uk Kim                              SSL_R_WRONG_SIGNATURE_TYPE);
11057bded2dbSJung-uk Kim                     return 0;
11067bded2dbSJung-uk Kim                 }
1107e71b7053SJung-uk Kim             }
1108e71b7053SJung-uk Kim         }
1109e71b7053SJung-uk Kim     } else if (tls1_suiteb(s)) {
1110e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1111e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
11127bded2dbSJung-uk Kim         return 0;
11137bded2dbSJung-uk Kim     }
11147bded2dbSJung-uk Kim #endif
11157bded2dbSJung-uk Kim 
11167bded2dbSJung-uk Kim     /* Check signature matches a type we sent */
1117ed7112f0SJung-uk Kim     sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1118e71b7053SJung-uk Kim     for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
1119e71b7053SJung-uk Kim         if (sig == *sent_sigs)
11207bded2dbSJung-uk Kim             break;
11217bded2dbSJung-uk Kim     }
11227bded2dbSJung-uk Kim     /* Allow fallback to SHA1 if not strict mode */
1123e71b7053SJung-uk Kim     if (i == sent_sigslen && (lu->hash != NID_sha1
11247bded2dbSJung-uk Kim         || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
1125e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1126e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
11277bded2dbSJung-uk Kim         return 0;
11287bded2dbSJung-uk Kim     }
1129e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, &md)) {
1130e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1131e71b7053SJung-uk Kim                  SSL_R_UNKNOWN_DIGEST);
11327bded2dbSJung-uk Kim         return 0;
11337bded2dbSJung-uk Kim     }
11347bded2dbSJung-uk Kim     /*
1135e71b7053SJung-uk Kim      * Make sure security callback allows algorithm. For historical
1136e71b7053SJung-uk Kim      * reasons we have to pass the sigalg as a two byte char array.
11377bded2dbSJung-uk Kim      */
1138e71b7053SJung-uk Kim     sigalgstr[0] = (sig >> 8) & 0xff;
1139e71b7053SJung-uk Kim     sigalgstr[1] = sig & 0xff;
1140*17f01e99SJung-uk Kim     secbits = sigalg_security_bits(lu);
1141*17f01e99SJung-uk Kim     if (secbits == 0 ||
1142*17f01e99SJung-uk Kim         !ssl_security(s, SSL_SECOP_SIGALG_CHECK, secbits,
1143*17f01e99SJung-uk Kim                       md != NULL ? EVP_MD_type(md) : NID_undef,
1144e71b7053SJung-uk Kim                       (void *)sigalgstr)) {
1145e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1146e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
1147e71b7053SJung-uk Kim         return 0;
1148e71b7053SJung-uk Kim     }
1149e71b7053SJung-uk Kim     /* Store the sigalg the peer uses */
1150e71b7053SJung-uk Kim     s->s3->tmp.peer_sigalg = lu;
1151e71b7053SJung-uk Kim     return 1;
1152e71b7053SJung-uk Kim }
1153e71b7053SJung-uk Kim 
1154e71b7053SJung-uk Kim int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
1155e71b7053SJung-uk Kim {
1156e71b7053SJung-uk Kim     if (s->s3->tmp.peer_sigalg == NULL)
1157e71b7053SJung-uk Kim         return 0;
1158e71b7053SJung-uk Kim     *pnid = s->s3->tmp.peer_sigalg->sig;
11597bded2dbSJung-uk Kim     return 1;
11607bded2dbSJung-uk Kim }
11617bded2dbSJung-uk Kim 
1162c9cf7b5cSJung-uk Kim int SSL_get_signature_type_nid(const SSL *s, int *pnid)
1163c9cf7b5cSJung-uk Kim {
1164c9cf7b5cSJung-uk Kim     if (s->s3->tmp.sigalg == NULL)
1165c9cf7b5cSJung-uk Kim         return 0;
1166c9cf7b5cSJung-uk Kim     *pnid = s->s3->tmp.sigalg->sig;
1167c9cf7b5cSJung-uk Kim     return 1;
1168c9cf7b5cSJung-uk Kim }
1169c9cf7b5cSJung-uk Kim 
11707bded2dbSJung-uk Kim /*
1171e71b7053SJung-uk Kim  * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1172e71b7053SJung-uk Kim  * supported, doesn't appear in supported signature algorithms, isn't supported
1173e71b7053SJung-uk Kim  * by the enabled protocol versions or by the security level.
1174e71b7053SJung-uk Kim  *
1175e71b7053SJung-uk Kim  * This function should only be used for checking which ciphers are supported
1176e71b7053SJung-uk Kim  * by the client.
1177e71b7053SJung-uk Kim  *
1178e71b7053SJung-uk Kim  * Call ssl_cipher_disabled() to check that it's enabled or not.
11797bded2dbSJung-uk Kim  */
1180e71b7053SJung-uk Kim int ssl_set_client_disabled(SSL *s)
11817bded2dbSJung-uk Kim {
1182e71b7053SJung-uk Kim     s->s3->tmp.mask_a = 0;
1183e71b7053SJung-uk Kim     s->s3->tmp.mask_k = 0;
1184e71b7053SJung-uk Kim     ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
1185e71b7053SJung-uk Kim     if (ssl_get_min_max_version(s, &s->s3->tmp.min_ver,
1186e71b7053SJung-uk Kim                                 &s->s3->tmp.max_ver, NULL) != 0)
1187e71b7053SJung-uk Kim         return 0;
11887bded2dbSJung-uk Kim #ifndef OPENSSL_NO_PSK
11897bded2dbSJung-uk Kim     /* with PSK there must be client callback set */
11907bded2dbSJung-uk Kim     if (!s->psk_client_callback) {
1191e71b7053SJung-uk Kim         s->s3->tmp.mask_a |= SSL_aPSK;
1192e71b7053SJung-uk Kim         s->s3->tmp.mask_k |= SSL_PSK;
11937bded2dbSJung-uk Kim     }
11947bded2dbSJung-uk Kim #endif                          /* OPENSSL_NO_PSK */
11957bded2dbSJung-uk Kim #ifndef OPENSSL_NO_SRP
11967bded2dbSJung-uk Kim     if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
1197e71b7053SJung-uk Kim         s->s3->tmp.mask_a |= SSL_aSRP;
1198e71b7053SJung-uk Kim         s->s3->tmp.mask_k |= SSL_kSRP;
11997bded2dbSJung-uk Kim     }
12007bded2dbSJung-uk Kim #endif
1201e71b7053SJung-uk Kim     return 1;
12021f13597dSJung-uk Kim }
12031f13597dSJung-uk Kim 
12046f9291ceSJung-uk Kim /*
1205e71b7053SJung-uk Kim  * ssl_cipher_disabled - check that a cipher is disabled or not
1206e71b7053SJung-uk Kim  * @s: SSL connection that you want to use the cipher on
1207e71b7053SJung-uk Kim  * @c: cipher to check
1208e71b7053SJung-uk Kim  * @op: Security check that you want to do
1209e71b7053SJung-uk Kim  * @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
12106cf8931aSJung-uk Kim  *
1211e71b7053SJung-uk Kim  * Returns 1 when it's disabled, 0 when enabled.
12126cf8931aSJung-uk Kim  */
1213*17f01e99SJung-uk Kim int ssl_cipher_disabled(const SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
1214db522d3aSSimon L. B. Nielsen {
1215e71b7053SJung-uk Kim     if (c->algorithm_mkey & s->s3->tmp.mask_k
1216e71b7053SJung-uk Kim         || c->algorithm_auth & s->s3->tmp.mask_a)
1217e71b7053SJung-uk Kim         return 1;
1218e71b7053SJung-uk Kim     if (s->s3->tmp.max_ver == 0)
1219e71b7053SJung-uk Kim         return 1;
1220e71b7053SJung-uk Kim     if (!SSL_IS_DTLS(s)) {
1221e71b7053SJung-uk Kim         int min_tls = c->min_tls;
1222de78d5d8SJung-uk Kim 
12237bded2dbSJung-uk Kim         /*
1224e71b7053SJung-uk Kim          * For historical reasons we will allow ECHDE to be selected by a server
1225e71b7053SJung-uk Kim          * in SSLv3 if we are a client
12267bded2dbSJung-uk Kim          */
1227e71b7053SJung-uk Kim         if (min_tls == TLS1_VERSION && ecdhe
1228e71b7053SJung-uk Kim                 && (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
1229e71b7053SJung-uk Kim             min_tls = SSL3_VERSION;
12307bded2dbSJung-uk Kim 
1231e71b7053SJung-uk Kim         if ((min_tls > s->s3->tmp.max_ver) || (c->max_tls < s->s3->tmp.min_ver))
1232b8721c16SJung-uk Kim             return 1;
1233b8721c16SJung-uk Kim     }
1234e71b7053SJung-uk Kim     if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
1235e71b7053SJung-uk Kim                            || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
12367bded2dbSJung-uk Kim         return 1;
12377bded2dbSJung-uk Kim 
1238e71b7053SJung-uk Kim     return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
12397bded2dbSJung-uk Kim }
12407bded2dbSJung-uk Kim 
1241e71b7053SJung-uk Kim int tls_use_ticket(SSL *s)
12427bded2dbSJung-uk Kim {
1243e71b7053SJung-uk Kim     if ((s->options & SSL_OP_NO_TICKET))
12447bded2dbSJung-uk Kim         return 0;
1245e71b7053SJung-uk Kim     return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1246db522d3aSSimon L. B. Nielsen }
1247db522d3aSSimon L. B. Nielsen 
12487bded2dbSJung-uk Kim int tls1_set_server_sigalgs(SSL *s)
12497bded2dbSJung-uk Kim {
12507bded2dbSJung-uk Kim     size_t i;
1251e71b7053SJung-uk Kim 
1252e71b7053SJung-uk Kim     /* Clear any shared signature algorithms */
1253da327cd2SJung-uk Kim     OPENSSL_free(s->shared_sigalgs);
1254da327cd2SJung-uk Kim     s->shared_sigalgs = NULL;
1255da327cd2SJung-uk Kim     s->shared_sigalgslen = 0;
1256e71b7053SJung-uk Kim     /* Clear certificate validity flags */
1257e71b7053SJung-uk Kim     for (i = 0; i < SSL_PKEY_NUM; i++)
1258e71b7053SJung-uk Kim         s->s3->tmp.valid_flags[i] = 0;
1259e71b7053SJung-uk Kim     /*
1260e71b7053SJung-uk Kim      * If peer sent no signature algorithms check to see if we support
1261e71b7053SJung-uk Kim      * the default algorithm for each certificate type
1262e71b7053SJung-uk Kim      */
1263e71b7053SJung-uk Kim     if (s->s3->tmp.peer_cert_sigalgs == NULL
1264e71b7053SJung-uk Kim             && s->s3->tmp.peer_sigalgs == NULL) {
1265e71b7053SJung-uk Kim         const uint16_t *sent_sigs;
1266e71b7053SJung-uk Kim         size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1267e71b7053SJung-uk Kim 
12687bded2dbSJung-uk Kim         for (i = 0; i < SSL_PKEY_NUM; i++) {
1269e71b7053SJung-uk Kim             const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1270e71b7053SJung-uk Kim             size_t j;
1271e71b7053SJung-uk Kim 
1272e71b7053SJung-uk Kim             if (lu == NULL)
1273e71b7053SJung-uk Kim                 continue;
1274e71b7053SJung-uk Kim             /* Check default matches a type we sent */
1275e71b7053SJung-uk Kim             for (j = 0; j < sent_sigslen; j++) {
1276e71b7053SJung-uk Kim                 if (lu->sigalg == sent_sigs[j]) {
1277e71b7053SJung-uk Kim                         s->s3->tmp.valid_flags[i] = CERT_PKEY_SIGN;
1278e71b7053SJung-uk Kim                         break;
1279e71b7053SJung-uk Kim                 }
1280e71b7053SJung-uk Kim             }
1281e71b7053SJung-uk Kim         }
1282e71b7053SJung-uk Kim         return 1;
12837bded2dbSJung-uk Kim     }
12847bded2dbSJung-uk Kim 
12857bded2dbSJung-uk Kim     if (!tls1_process_sigalgs(s)) {
1286e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1287e71b7053SJung-uk Kim                  SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_INTERNAL_ERROR);
12887bded2dbSJung-uk Kim         return 0;
12897bded2dbSJung-uk Kim     }
1290da327cd2SJung-uk Kim     if (s->shared_sigalgs != NULL)
1291e71b7053SJung-uk Kim         return 1;
12927bded2dbSJung-uk Kim 
1293e71b7053SJung-uk Kim     /* Fatal error if no shared signature algorithms */
1294e71b7053SJung-uk Kim     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS1_SET_SERVER_SIGALGS,
1295e71b7053SJung-uk Kim              SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
12966cf8931aSJung-uk Kim     return 0;
129709286989SJung-uk Kim }
12987bded2dbSJung-uk Kim 
12996f9291ceSJung-uk Kim /*-
1300e71b7053SJung-uk Kim  * Gets the ticket information supplied by the client if any.
13011f13597dSJung-uk Kim  *
1302e71b7053SJung-uk Kim  *   hello: The parsed ClientHello data
13031f13597dSJung-uk Kim  *   ret: (output) on return, if a ticket was decrypted, then this is set to
13041f13597dSJung-uk Kim  *       point to the resulting session.
1305e71b7053SJung-uk Kim  */
1306e71b7053SJung-uk Kim SSL_TICKET_STATUS tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1307e71b7053SJung-uk Kim                                              SSL_SESSION **ret)
1308e71b7053SJung-uk Kim {
1309e71b7053SJung-uk Kim     size_t size;
1310e71b7053SJung-uk Kim     RAW_EXTENSION *ticketext;
1311e71b7053SJung-uk Kim 
1312e71b7053SJung-uk Kim     *ret = NULL;
1313e71b7053SJung-uk Kim     s->ext.ticket_expected = 0;
1314e71b7053SJung-uk Kim 
1315e71b7053SJung-uk Kim     /*
1316e71b7053SJung-uk Kim      * If tickets disabled or not supported by the protocol version
1317e71b7053SJung-uk Kim      * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
1318e71b7053SJung-uk Kim      * resumption.
1319e71b7053SJung-uk Kim      */
1320e71b7053SJung-uk Kim     if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
1321e71b7053SJung-uk Kim         return SSL_TICKET_NONE;
1322e71b7053SJung-uk Kim 
1323e71b7053SJung-uk Kim     ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1324e71b7053SJung-uk Kim     if (!ticketext->present)
1325e71b7053SJung-uk Kim         return SSL_TICKET_NONE;
1326e71b7053SJung-uk Kim 
1327e71b7053SJung-uk Kim     size = PACKET_remaining(&ticketext->data);
1328e71b7053SJung-uk Kim 
1329e71b7053SJung-uk Kim     return tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1330e71b7053SJung-uk Kim                               hello->session_id, hello->session_id_len, ret);
1331e71b7053SJung-uk Kim }
1332e71b7053SJung-uk Kim 
1333e71b7053SJung-uk Kim /*-
1334e71b7053SJung-uk Kim  * tls_decrypt_ticket attempts to decrypt a session ticket.
13351f13597dSJung-uk Kim  *
1336e71b7053SJung-uk Kim  * If s->tls_session_secret_cb is set and we're not doing TLSv1.3 then we are
1337e71b7053SJung-uk Kim  * expecting a pre-shared key ciphersuite, in which case we have no use for
1338e71b7053SJung-uk Kim  * session tickets and one will never be decrypted, nor will
1339e71b7053SJung-uk Kim  * s->ext.ticket_expected be set to 1.
13401f13597dSJung-uk Kim  *
13411f13597dSJung-uk Kim  * Side effects:
1342e71b7053SJung-uk Kim  *   Sets s->ext.ticket_expected to 1 if the server will have to issue
13431f13597dSJung-uk Kim  *   a new session ticket to the client because the client indicated support
13441f13597dSJung-uk Kim  *   (and s->tls_session_secret_cb is NULL) but the client either doesn't have
13451f13597dSJung-uk Kim  *   a session ticket or we couldn't use the one it gave us, or if
1346e71b7053SJung-uk Kim  *   s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1347e71b7053SJung-uk Kim  *   Otherwise, s->ext.ticket_expected is set to 0.
1348e71b7053SJung-uk Kim  *
1349e71b7053SJung-uk Kim  *   etick: points to the body of the session ticket extension.
1350e71b7053SJung-uk Kim  *   eticklen: the length of the session tickets extension.
1351e71b7053SJung-uk Kim  *   sess_id: points at the session ID.
1352e71b7053SJung-uk Kim  *   sesslen: the length of the session ID.
1353e71b7053SJung-uk Kim  *   psess: (output) on return, if a ticket was decrypted, then this is set to
1354e71b7053SJung-uk Kim  *       point to the resulting session.
1355db522d3aSSimon L. B. Nielsen  */
1356e71b7053SJung-uk Kim SSL_TICKET_STATUS tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1357e71b7053SJung-uk Kim                                      size_t eticklen, const unsigned char *sess_id,
1358e71b7053SJung-uk Kim                                      size_t sesslen, SSL_SESSION **psess)
1359db522d3aSSimon L. B. Nielsen {
1360e71b7053SJung-uk Kim     SSL_SESSION *sess = NULL;
1361e71b7053SJung-uk Kim     unsigned char *sdec;
1362e71b7053SJung-uk Kim     const unsigned char *p;
1363e71b7053SJung-uk Kim     int slen, renew_ticket = 0, declen;
1364e71b7053SJung-uk Kim     SSL_TICKET_STATUS ret = SSL_TICKET_FATAL_ERR_OTHER;
1365e71b7053SJung-uk Kim     size_t mlen;
1366e71b7053SJung-uk Kim     unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1367e71b7053SJung-uk Kim     HMAC_CTX *hctx = NULL;
1368e71b7053SJung-uk Kim     EVP_CIPHER_CTX *ctx = NULL;
1369e71b7053SJung-uk Kim     SSL_CTX *tctx = s->session_ctx;
1370db522d3aSSimon L. B. Nielsen 
1371e71b7053SJung-uk Kim     if (eticklen == 0) {
13726f9291ceSJung-uk Kim         /*
13736f9291ceSJung-uk Kim          * The client will accept a ticket but doesn't currently have
1374e71b7053SJung-uk Kim          * one (TLSv1.2 and below), or treated as a fatal error in TLSv1.3
13756f9291ceSJung-uk Kim          */
1376e71b7053SJung-uk Kim         ret = SSL_TICKET_EMPTY;
1377e71b7053SJung-uk Kim         goto end;
1378db522d3aSSimon L. B. Nielsen     }
1379e71b7053SJung-uk Kim     if (!SSL_IS_TLS13(s) && s->ext.session_secret_cb) {
13806f9291ceSJung-uk Kim         /*
13816f9291ceSJung-uk Kim          * Indicate that the ticket couldn't be decrypted rather than
13826f9291ceSJung-uk Kim          * generating the session from ticket now, trigger
13836f9291ceSJung-uk Kim          * abbreviated handshake based on external mechanism to
13846f9291ceSJung-uk Kim          * calculate the master secret later.
13856f9291ceSJung-uk Kim          */
1386e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1387e71b7053SJung-uk Kim         goto end;
13881f13597dSJung-uk Kim     }
1389aeb5019cSJung-uk Kim 
1390dee36b4fSJung-uk Kim     /* Need at least keyname + iv */
1391e71b7053SJung-uk Kim     if (eticklen < TLSEXT_KEYNAME_LENGTH + EVP_MAX_IV_LENGTH) {
1392e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1393e71b7053SJung-uk Kim         goto end;
1394e71b7053SJung-uk Kim     }
1395dee36b4fSJung-uk Kim 
1396db522d3aSSimon L. B. Nielsen     /* Initialize session ticket encryption and HMAC contexts */
1397e71b7053SJung-uk Kim     hctx = HMAC_CTX_new();
1398e71b7053SJung-uk Kim     if (hctx == NULL) {
1399e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_MALLOC;
1400e71b7053SJung-uk Kim         goto end;
1401e71b7053SJung-uk Kim     }
1402e71b7053SJung-uk Kim     ctx = EVP_CIPHER_CTX_new();
1403e71b7053SJung-uk Kim     if (ctx == NULL) {
1404e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_MALLOC;
1405e71b7053SJung-uk Kim         goto end;
1406e71b7053SJung-uk Kim     }
1407e71b7053SJung-uk Kim     if (tctx->ext.ticket_key_cb) {
1408db522d3aSSimon L. B. Nielsen         unsigned char *nctick = (unsigned char *)etick;
1409e71b7053SJung-uk Kim         int rv = tctx->ext.ticket_key_cb(s, nctick,
1410e71b7053SJung-uk Kim                                          nctick + TLSEXT_KEYNAME_LENGTH,
1411e71b7053SJung-uk Kim                                          ctx, hctx, 0);
1412e71b7053SJung-uk Kim         if (rv < 0) {
1413e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1414e71b7053SJung-uk Kim             goto end;
1415e71b7053SJung-uk Kim         }
1416dee36b4fSJung-uk Kim         if (rv == 0) {
1417e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1418e71b7053SJung-uk Kim             goto end;
1419dee36b4fSJung-uk Kim         }
1420db522d3aSSimon L. B. Nielsen         if (rv == 2)
1421db522d3aSSimon L. B. Nielsen             renew_ticket = 1;
14226f9291ceSJung-uk Kim     } else {
1423db522d3aSSimon L. B. Nielsen         /* Check key name matches */
1424e71b7053SJung-uk Kim         if (memcmp(etick, tctx->ext.tick_key_name,
1425e71b7053SJung-uk Kim                    TLSEXT_KEYNAME_LENGTH) != 0) {
1426e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1427e71b7053SJung-uk Kim             goto end;
142880815a77SJung-uk Kim         }
1429e71b7053SJung-uk Kim         if (HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key,
1430e71b7053SJung-uk Kim                          sizeof(tctx->ext.secure->tick_hmac_key),
1431e71b7053SJung-uk Kim                          EVP_sha256(), NULL) <= 0
1432e71b7053SJung-uk Kim             || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
1433e71b7053SJung-uk Kim                                   tctx->ext.secure->tick_aes_key,
1434e71b7053SJung-uk Kim                                   etick + TLSEXT_KEYNAME_LENGTH) <= 0) {
1435e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1436e71b7053SJung-uk Kim             goto end;
1437e71b7053SJung-uk Kim         }
1438e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s))
1439e71b7053SJung-uk Kim             renew_ticket = 1;
1440db522d3aSSimon L. B. Nielsen     }
14416f9291ceSJung-uk Kim     /*
14426f9291ceSJung-uk Kim      * Attempt to process session ticket, first conduct sanity and integrity
14436f9291ceSJung-uk Kim      * checks on ticket.
1444db522d3aSSimon L. B. Nielsen      */
1445e71b7053SJung-uk Kim     mlen = HMAC_size(hctx);
1446e71b7053SJung-uk Kim     if (mlen == 0) {
1447e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1448e71b7053SJung-uk Kim         goto end;
1449aeb5019cSJung-uk Kim     }
1450aeb5019cSJung-uk Kim 
1451e71b7053SJung-uk Kim     /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1452e71b7053SJung-uk Kim     if (eticklen <=
1453e71b7053SJung-uk Kim         TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1454e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1455e71b7053SJung-uk Kim         goto end;
1456e71b7053SJung-uk Kim     }
1457db522d3aSSimon L. B. Nielsen     eticklen -= mlen;
1458db522d3aSSimon L. B. Nielsen     /* Check HMAC of encrypted ticket */
1459e71b7053SJung-uk Kim     if (HMAC_Update(hctx, etick, eticklen) <= 0
1460e71b7053SJung-uk Kim         || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
1461e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1462e71b7053SJung-uk Kim         goto end;
146380815a77SJung-uk Kim     }
1464e71b7053SJung-uk Kim 
14656f9291ceSJung-uk Kim     if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
1466e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1467e71b7053SJung-uk Kim         goto end;
1468fa5fddf1SJung-uk Kim     }
1469db522d3aSSimon L. B. Nielsen     /* Attempt to decrypt session data */
1470db522d3aSSimon L. B. Nielsen     /* Move p after IV to start of encrypted ticket, update length */
1471e71b7053SJung-uk Kim     p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1472e71b7053SJung-uk Kim     eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1473db522d3aSSimon L. B. Nielsen     sdec = OPENSSL_malloc(eticklen);
1474e71b7053SJung-uk Kim     if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1475e71b7053SJung-uk Kim                                           (int)eticklen) <= 0) {
1476b8721c16SJung-uk Kim         OPENSSL_free(sdec);
1477e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1478e71b7053SJung-uk Kim         goto end;
1479db522d3aSSimon L. B. Nielsen     }
1480e71b7053SJung-uk Kim     if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
1481a93cbc2bSJung-uk Kim         OPENSSL_free(sdec);
1482e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1483e71b7053SJung-uk Kim         goto end;
1484a93cbc2bSJung-uk Kim     }
1485e71b7053SJung-uk Kim     slen += declen;
1486db522d3aSSimon L. B. Nielsen     p = sdec;
1487db522d3aSSimon L. B. Nielsen 
1488db522d3aSSimon L. B. Nielsen     sess = d2i_SSL_SESSION(NULL, &p, slen);
1489ed7112f0SJung-uk Kim     slen -= p - sdec;
1490db522d3aSSimon L. B. Nielsen     OPENSSL_free(sdec);
14916f9291ceSJung-uk Kim     if (sess) {
1492ed7112f0SJung-uk Kim         /* Some additional consistency checks */
1493e71b7053SJung-uk Kim         if (slen != 0) {
1494ed7112f0SJung-uk Kim             SSL_SESSION_free(sess);
1495e71b7053SJung-uk Kim             sess = NULL;
1496e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1497e71b7053SJung-uk Kim             goto end;
1498ed7112f0SJung-uk Kim         }
14996f9291ceSJung-uk Kim         /*
15006f9291ceSJung-uk Kim          * The session ID, if non-empty, is used by some clients to detect
15016f9291ceSJung-uk Kim          * that the ticket has been accepted. So we copy it to the session
15026f9291ceSJung-uk Kim          * structure. If it is empty set length to zero as required by
15036f9291ceSJung-uk Kim          * standard.
1504db522d3aSSimon L. B. Nielsen          */
1505e71b7053SJung-uk Kim         if (sesslen) {
1506db522d3aSSimon L. B. Nielsen             memcpy(sess->session_id, sess_id, sesslen);
1507db522d3aSSimon L. B. Nielsen             sess->session_id_length = sesslen;
1508e71b7053SJung-uk Kim         }
15091f13597dSJung-uk Kim         if (renew_ticket)
1510e71b7053SJung-uk Kim             ret = SSL_TICKET_SUCCESS_RENEW;
15111f13597dSJung-uk Kim         else
1512e71b7053SJung-uk Kim             ret = SSL_TICKET_SUCCESS;
1513e71b7053SJung-uk Kim         goto end;
15141f13597dSJung-uk Kim     }
15151f13597dSJung-uk Kim     ERR_clear_error();
15166f9291ceSJung-uk Kim     /*
15176f9291ceSJung-uk Kim      * For session parse failure, indicate that we need to send a new ticket.
15186f9291ceSJung-uk Kim      */
1519e71b7053SJung-uk Kim     ret = SSL_TICKET_NO_DECRYPT;
15201f13597dSJung-uk Kim 
1521e71b7053SJung-uk Kim  end:
1522e71b7053SJung-uk Kim     EVP_CIPHER_CTX_free(ctx);
1523e71b7053SJung-uk Kim     HMAC_CTX_free(hctx);
15241f13597dSJung-uk Kim 
1525e71b7053SJung-uk Kim     /*
1526e71b7053SJung-uk Kim      * If set, the decrypt_ticket_cb() is called unless a fatal error was
1527e71b7053SJung-uk Kim      * detected above. The callback is responsible for checking |ret| before it
1528e71b7053SJung-uk Kim      * performs any action
1529e71b7053SJung-uk Kim      */
1530e71b7053SJung-uk Kim     if (s->session_ctx->decrypt_ticket_cb != NULL
1531e71b7053SJung-uk Kim             && (ret == SSL_TICKET_EMPTY
1532e71b7053SJung-uk Kim                 || ret == SSL_TICKET_NO_DECRYPT
1533e71b7053SJung-uk Kim                 || ret == SSL_TICKET_SUCCESS
1534e71b7053SJung-uk Kim                 || ret == SSL_TICKET_SUCCESS_RENEW)) {
1535e71b7053SJung-uk Kim         size_t keyname_len = eticklen;
1536e71b7053SJung-uk Kim         int retcb;
15371f13597dSJung-uk Kim 
1538e71b7053SJung-uk Kim         if (keyname_len > TLSEXT_KEYNAME_LENGTH)
1539e71b7053SJung-uk Kim             keyname_len = TLSEXT_KEYNAME_LENGTH;
1540e71b7053SJung-uk Kim         retcb = s->session_ctx->decrypt_ticket_cb(s, sess, etick, keyname_len,
1541e71b7053SJung-uk Kim                                                   ret,
1542e71b7053SJung-uk Kim                                                   s->session_ctx->ticket_cb_data);
1543e71b7053SJung-uk Kim         switch (retcb) {
1544e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_ABORT:
1545e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1546e71b7053SJung-uk Kim             break;
15471f13597dSJung-uk Kim 
1548e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_IGNORE:
1549e71b7053SJung-uk Kim             ret = SSL_TICKET_NONE;
1550e71b7053SJung-uk Kim             SSL_SESSION_free(sess);
1551e71b7053SJung-uk Kim             sess = NULL;
1552e71b7053SJung-uk Kim             break;
15531f13597dSJung-uk Kim 
1554e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_IGNORE_RENEW:
1555e71b7053SJung-uk Kim             if (ret != SSL_TICKET_EMPTY && ret != SSL_TICKET_NO_DECRYPT)
1556e71b7053SJung-uk Kim                 ret = SSL_TICKET_NO_DECRYPT;
1557e71b7053SJung-uk Kim             /* else the value of |ret| will already do the right thing */
1558e71b7053SJung-uk Kim             SSL_SESSION_free(sess);
1559e71b7053SJung-uk Kim             sess = NULL;
1560e71b7053SJung-uk Kim             break;
15616f9291ceSJung-uk Kim 
1562e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_USE:
1563e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_USE_RENEW:
1564e71b7053SJung-uk Kim             if (ret != SSL_TICKET_SUCCESS
1565e71b7053SJung-uk Kim                     && ret != SSL_TICKET_SUCCESS_RENEW)
1566e71b7053SJung-uk Kim                 ret = SSL_TICKET_FATAL_ERR_OTHER;
1567e71b7053SJung-uk Kim             else if (retcb == SSL_TICKET_RETURN_USE)
1568e71b7053SJung-uk Kim                 ret = SSL_TICKET_SUCCESS;
1569e71b7053SJung-uk Kim             else
1570e71b7053SJung-uk Kim                 ret = SSL_TICKET_SUCCESS_RENEW;
1571e71b7053SJung-uk Kim             break;
15721f13597dSJung-uk Kim 
15731f13597dSJung-uk Kim         default:
1574e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
15751f13597dSJung-uk Kim         }
15761f13597dSJung-uk Kim     }
15771f13597dSJung-uk Kim 
1578e71b7053SJung-uk Kim     if (s->ext.session_secret_cb == NULL || SSL_IS_TLS13(s)) {
1579e71b7053SJung-uk Kim         switch (ret) {
1580e71b7053SJung-uk Kim         case SSL_TICKET_NO_DECRYPT:
1581e71b7053SJung-uk Kim         case SSL_TICKET_SUCCESS_RENEW:
1582e71b7053SJung-uk Kim         case SSL_TICKET_EMPTY:
1583e71b7053SJung-uk Kim             s->ext.ticket_expected = 1;
1584e71b7053SJung-uk Kim         }
1585e71b7053SJung-uk Kim     }
1586e71b7053SJung-uk Kim 
1587e71b7053SJung-uk Kim     *psess = sess;
1588e71b7053SJung-uk Kim 
1589e71b7053SJung-uk Kim     return ret;
1590e71b7053SJung-uk Kim }
1591e71b7053SJung-uk Kim 
1592e71b7053SJung-uk Kim /* Check to see if a signature algorithm is allowed */
1593*17f01e99SJung-uk Kim static int tls12_sigalg_allowed(const SSL *s, int op, const SIGALG_LOOKUP *lu)
15947bded2dbSJung-uk Kim {
1595e71b7053SJung-uk Kim     unsigned char sigalgstr[2];
1596e71b7053SJung-uk Kim     int secbits;
1597e71b7053SJung-uk Kim 
1598e71b7053SJung-uk Kim     /* See if sigalgs is recognised and if hash is enabled */
1599e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, NULL))
1600e71b7053SJung-uk Kim         return 0;
1601e71b7053SJung-uk Kim     /* DSA is not allowed in TLS 1.3 */
1602e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s) && lu->sig == EVP_PKEY_DSA)
1603e71b7053SJung-uk Kim         return 0;
1604e71b7053SJung-uk Kim     /* TODO(OpenSSL1.2) fully axe DSA/etc. in ClientHello per TLS 1.3 spec */
1605e71b7053SJung-uk Kim     if (!s->server && !SSL_IS_DTLS(s) && s->s3->tmp.min_ver >= TLS1_3_VERSION
1606e71b7053SJung-uk Kim         && (lu->sig == EVP_PKEY_DSA || lu->hash_idx == SSL_MD_SHA1_IDX
1607e71b7053SJung-uk Kim             || lu->hash_idx == SSL_MD_MD5_IDX
1608e71b7053SJung-uk Kim             || lu->hash_idx == SSL_MD_SHA224_IDX))
1609e71b7053SJung-uk Kim         return 0;
1610e71b7053SJung-uk Kim 
1611e71b7053SJung-uk Kim     /* See if public key algorithm allowed */
1612e71b7053SJung-uk Kim     if (ssl_cert_is_disabled(lu->sig_idx))
1613e71b7053SJung-uk Kim         return 0;
1614e71b7053SJung-uk Kim 
1615e71b7053SJung-uk Kim     if (lu->sig == NID_id_GostR3410_2012_256
1616e71b7053SJung-uk Kim             || lu->sig == NID_id_GostR3410_2012_512
1617e71b7053SJung-uk Kim             || lu->sig == NID_id_GostR3410_2001) {
1618e71b7053SJung-uk Kim         /* We never allow GOST sig algs on the server with TLSv1.3 */
1619e71b7053SJung-uk Kim         if (s->server && SSL_IS_TLS13(s))
1620e71b7053SJung-uk Kim             return 0;
1621e71b7053SJung-uk Kim         if (!s->server
1622e71b7053SJung-uk Kim                 && s->method->version == TLS_ANY_VERSION
1623e71b7053SJung-uk Kim                 && s->s3->tmp.max_ver >= TLS1_3_VERSION) {
1624e71b7053SJung-uk Kim             int i, num;
1625e71b7053SJung-uk Kim             STACK_OF(SSL_CIPHER) *sk;
1626e71b7053SJung-uk Kim 
1627e71b7053SJung-uk Kim             /*
1628e71b7053SJung-uk Kim              * We're a client that could negotiate TLSv1.3. We only allow GOST
1629e71b7053SJung-uk Kim              * sig algs if we could negotiate TLSv1.2 or below and we have GOST
1630e71b7053SJung-uk Kim              * ciphersuites enabled.
1631e71b7053SJung-uk Kim              */
1632e71b7053SJung-uk Kim 
1633e71b7053SJung-uk Kim             if (s->s3->tmp.min_ver >= TLS1_3_VERSION)
1634e71b7053SJung-uk Kim                 return 0;
1635e71b7053SJung-uk Kim 
1636e71b7053SJung-uk Kim             sk = SSL_get_ciphers(s);
1637e71b7053SJung-uk Kim             num = sk != NULL ? sk_SSL_CIPHER_num(sk) : 0;
1638e71b7053SJung-uk Kim             for (i = 0; i < num; i++) {
1639e71b7053SJung-uk Kim                 const SSL_CIPHER *c;
1640e71b7053SJung-uk Kim 
1641e71b7053SJung-uk Kim                 c = sk_SSL_CIPHER_value(sk, i);
1642e71b7053SJung-uk Kim                 /* Skip disabled ciphers */
1643e71b7053SJung-uk Kim                 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0))
1644e71b7053SJung-uk Kim                     continue;
1645e71b7053SJung-uk Kim 
1646e71b7053SJung-uk Kim                 if ((c->algorithm_mkey & SSL_kGOST) != 0)
1647e71b7053SJung-uk Kim                     break;
16487bded2dbSJung-uk Kim             }
1649e71b7053SJung-uk Kim             if (i == num)
1650e71b7053SJung-uk Kim                 return 0;
1651e71b7053SJung-uk Kim         }
16527bded2dbSJung-uk Kim     }
16537bded2dbSJung-uk Kim 
1654e71b7053SJung-uk Kim     /* Finally see if security callback allows it */
1655*17f01e99SJung-uk Kim     secbits = sigalg_security_bits(lu);
1656e71b7053SJung-uk Kim     sigalgstr[0] = (lu->sigalg >> 8) & 0xff;
1657e71b7053SJung-uk Kim     sigalgstr[1] = lu->sigalg & 0xff;
1658e71b7053SJung-uk Kim     return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
1659e71b7053SJung-uk Kim }
1660e71b7053SJung-uk Kim 
1661e71b7053SJung-uk Kim /*
1662e71b7053SJung-uk Kim  * Get a mask of disabled public key algorithms based on supported signature
1663e71b7053SJung-uk Kim  * algorithms. For example if no signature algorithm supports RSA then RSA is
1664e71b7053SJung-uk Kim  * disabled.
1665e71b7053SJung-uk Kim  */
1666e71b7053SJung-uk Kim 
1667e71b7053SJung-uk Kim void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
16687bded2dbSJung-uk Kim {
1669e71b7053SJung-uk Kim     const uint16_t *sigalgs;
1670e71b7053SJung-uk Kim     size_t i, sigalgslen;
1671e71b7053SJung-uk Kim     uint32_t disabled_mask = SSL_aRSA | SSL_aDSS | SSL_aECDSA;
1672e71b7053SJung-uk Kim     /*
1673e71b7053SJung-uk Kim      * Go through all signature algorithms seeing if we support any
1674e71b7053SJung-uk Kim      * in disabled_mask.
1675e71b7053SJung-uk Kim      */
1676e71b7053SJung-uk Kim     sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
1677e71b7053SJung-uk Kim     for (i = 0; i < sigalgslen; i++, sigalgs++) {
1678e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*sigalgs);
1679e71b7053SJung-uk Kim         const SSL_CERT_LOOKUP *clu;
1680e71b7053SJung-uk Kim 
1681e71b7053SJung-uk Kim         if (lu == NULL)
1682e71b7053SJung-uk Kim             continue;
1683e71b7053SJung-uk Kim 
1684e71b7053SJung-uk Kim         clu = ssl_cert_lookup_by_idx(lu->sig_idx);
1685e71b7053SJung-uk Kim 	if (clu == NULL)
1686e71b7053SJung-uk Kim 		continue;
1687e71b7053SJung-uk Kim 
1688e71b7053SJung-uk Kim         /* If algorithm is disabled see if we can enable it */
1689e71b7053SJung-uk Kim         if ((clu->amask & disabled_mask) != 0
1690e71b7053SJung-uk Kim                 && tls12_sigalg_allowed(s, op, lu))
1691e71b7053SJung-uk Kim             disabled_mask &= ~clu->amask;
16927bded2dbSJung-uk Kim     }
1693e71b7053SJung-uk Kim     *pmask_a |= disabled_mask;
16947bded2dbSJung-uk Kim }
1695e71b7053SJung-uk Kim 
1696e71b7053SJung-uk Kim int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
1697e71b7053SJung-uk Kim                        const uint16_t *psig, size_t psiglen)
1698e71b7053SJung-uk Kim {
1699e71b7053SJung-uk Kim     size_t i;
1700e71b7053SJung-uk Kim     int rv = 0;
1701e71b7053SJung-uk Kim 
1702e71b7053SJung-uk Kim     for (i = 0; i < psiglen; i++, psig++) {
1703e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*psig);
1704e71b7053SJung-uk Kim 
1705e71b7053SJung-uk Kim         if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
1706e71b7053SJung-uk Kim             continue;
1707e71b7053SJung-uk Kim         if (!WPACKET_put_bytes_u16(pkt, *psig))
1708e71b7053SJung-uk Kim             return 0;
1709e71b7053SJung-uk Kim         /*
1710e71b7053SJung-uk Kim          * If TLS 1.3 must have at least one valid TLS 1.3 message
1711e71b7053SJung-uk Kim          * signing algorithm: i.e. neither RSA nor SHA1/SHA224
1712e71b7053SJung-uk Kim          */
1713e71b7053SJung-uk Kim         if (rv == 0 && (!SSL_IS_TLS13(s)
1714e71b7053SJung-uk Kim             || (lu->sig != EVP_PKEY_RSA
1715e71b7053SJung-uk Kim                 && lu->hash != NID_sha1
1716e71b7053SJung-uk Kim                 && lu->hash != NID_sha224)))
1717e71b7053SJung-uk Kim             rv = 1;
17187bded2dbSJung-uk Kim     }
1719e71b7053SJung-uk Kim     if (rv == 0)
1720e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS12_COPY_SIGALGS, SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
1721e71b7053SJung-uk Kim     return rv;
17227bded2dbSJung-uk Kim }
17237bded2dbSJung-uk Kim 
17247bded2dbSJung-uk Kim /* Given preference and allowed sigalgs set shared sigalgs */
1725e71b7053SJung-uk Kim static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
1726e71b7053SJung-uk Kim                                    const uint16_t *pref, size_t preflen,
1727e71b7053SJung-uk Kim                                    const uint16_t *allow, size_t allowlen)
17287bded2dbSJung-uk Kim {
1729e71b7053SJung-uk Kim     const uint16_t *ptmp, *atmp;
17307bded2dbSJung-uk Kim     size_t i, j, nmatch = 0;
1731e71b7053SJung-uk Kim     for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
1732e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*ptmp);
1733e71b7053SJung-uk Kim 
17347bded2dbSJung-uk Kim         /* Skip disabled hashes or signature algorithms */
1735e71b7053SJung-uk Kim         if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, lu))
17367bded2dbSJung-uk Kim             continue;
1737e71b7053SJung-uk Kim         for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
1738e71b7053SJung-uk Kim             if (*ptmp == *atmp) {
17397bded2dbSJung-uk Kim                 nmatch++;
1740e71b7053SJung-uk Kim                 if (shsig)
1741e71b7053SJung-uk Kim                     *shsig++ = lu;
17427bded2dbSJung-uk Kim                 break;
17437bded2dbSJung-uk Kim             }
17447bded2dbSJung-uk Kim         }
17457bded2dbSJung-uk Kim     }
17467bded2dbSJung-uk Kim     return nmatch;
17477bded2dbSJung-uk Kim }
17487bded2dbSJung-uk Kim 
17497bded2dbSJung-uk Kim /* Set shared signature algorithms for SSL structures */
17507bded2dbSJung-uk Kim static int tls1_set_shared_sigalgs(SSL *s)
17517bded2dbSJung-uk Kim {
1752e71b7053SJung-uk Kim     const uint16_t *pref, *allow, *conf;
17537bded2dbSJung-uk Kim     size_t preflen, allowlen, conflen;
17547bded2dbSJung-uk Kim     size_t nmatch;
1755e71b7053SJung-uk Kim     const SIGALG_LOOKUP **salgs = NULL;
17567bded2dbSJung-uk Kim     CERT *c = s->cert;
17577bded2dbSJung-uk Kim     unsigned int is_suiteb = tls1_suiteb(s);
1758e71b7053SJung-uk Kim 
1759da327cd2SJung-uk Kim     OPENSSL_free(s->shared_sigalgs);
1760da327cd2SJung-uk Kim     s->shared_sigalgs = NULL;
1761da327cd2SJung-uk Kim     s->shared_sigalgslen = 0;
17627bded2dbSJung-uk Kim     /* If client use client signature algorithms if not NULL */
17637bded2dbSJung-uk Kim     if (!s->server && c->client_sigalgs && !is_suiteb) {
17647bded2dbSJung-uk Kim         conf = c->client_sigalgs;
17657bded2dbSJung-uk Kim         conflen = c->client_sigalgslen;
17667bded2dbSJung-uk Kim     } else if (c->conf_sigalgs && !is_suiteb) {
17677bded2dbSJung-uk Kim         conf = c->conf_sigalgs;
17687bded2dbSJung-uk Kim         conflen = c->conf_sigalgslen;
17697bded2dbSJung-uk Kim     } else
1770ed7112f0SJung-uk Kim         conflen = tls12_get_psigalgs(s, 0, &conf);
17717bded2dbSJung-uk Kim     if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
17727bded2dbSJung-uk Kim         pref = conf;
17737bded2dbSJung-uk Kim         preflen = conflen;
1774e71b7053SJung-uk Kim         allow = s->s3->tmp.peer_sigalgs;
1775e71b7053SJung-uk Kim         allowlen = s->s3->tmp.peer_sigalgslen;
17767bded2dbSJung-uk Kim     } else {
17777bded2dbSJung-uk Kim         allow = conf;
17787bded2dbSJung-uk Kim         allowlen = conflen;
1779e71b7053SJung-uk Kim         pref = s->s3->tmp.peer_sigalgs;
1780e71b7053SJung-uk Kim         preflen = s->s3->tmp.peer_sigalgslen;
17817bded2dbSJung-uk Kim     }
1782e71b7053SJung-uk Kim     nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
17837bded2dbSJung-uk Kim     if (nmatch) {
1784e71b7053SJung-uk Kim         if ((salgs = OPENSSL_malloc(nmatch * sizeof(*salgs))) == NULL) {
1785e71b7053SJung-uk Kim             SSLerr(SSL_F_TLS1_SET_SHARED_SIGALGS, ERR_R_MALLOC_FAILURE);
17867bded2dbSJung-uk Kim             return 0;
1787e71b7053SJung-uk Kim         }
1788e71b7053SJung-uk Kim         nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
17897bded2dbSJung-uk Kim     } else {
17907bded2dbSJung-uk Kim         salgs = NULL;
17917bded2dbSJung-uk Kim     }
1792da327cd2SJung-uk Kim     s->shared_sigalgs = salgs;
1793da327cd2SJung-uk Kim     s->shared_sigalgslen = nmatch;
17947bded2dbSJung-uk Kim     return 1;
17957bded2dbSJung-uk Kim }
17967bded2dbSJung-uk Kim 
1797e71b7053SJung-uk Kim int tls1_save_u16(PACKET *pkt, uint16_t **pdest, size_t *pdestlen)
17981f13597dSJung-uk Kim {
1799e71b7053SJung-uk Kim     unsigned int stmp;
1800e71b7053SJung-uk Kim     size_t size, i;
1801e71b7053SJung-uk Kim     uint16_t *buf;
1802e71b7053SJung-uk Kim 
1803e71b7053SJung-uk Kim     size = PACKET_remaining(pkt);
1804e71b7053SJung-uk Kim 
1805e71b7053SJung-uk Kim     /* Invalid data length */
1806e71b7053SJung-uk Kim     if (size == 0 || (size & 1) != 0)
1807e71b7053SJung-uk Kim         return 0;
1808e71b7053SJung-uk Kim 
1809e71b7053SJung-uk Kim     size >>= 1;
1810e71b7053SJung-uk Kim 
1811e71b7053SJung-uk Kim     if ((buf = OPENSSL_malloc(size * sizeof(*buf))) == NULL)  {
1812e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SAVE_U16, ERR_R_MALLOC_FAILURE);
1813e71b7053SJung-uk Kim         return 0;
1814e71b7053SJung-uk Kim     }
1815e71b7053SJung-uk Kim     for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
1816e71b7053SJung-uk Kim         buf[i] = stmp;
1817e71b7053SJung-uk Kim 
1818e71b7053SJung-uk Kim     if (i != size) {
1819e71b7053SJung-uk Kim         OPENSSL_free(buf);
1820e71b7053SJung-uk Kim         return 0;
1821e71b7053SJung-uk Kim     }
1822e71b7053SJung-uk Kim 
1823e71b7053SJung-uk Kim     OPENSSL_free(*pdest);
1824e71b7053SJung-uk Kim     *pdest = buf;
1825e71b7053SJung-uk Kim     *pdestlen = size;
1826e71b7053SJung-uk Kim 
1827e71b7053SJung-uk Kim     return 1;
1828e71b7053SJung-uk Kim }
1829e71b7053SJung-uk Kim 
1830e71b7053SJung-uk Kim int tls1_save_sigalgs(SSL *s, PACKET *pkt, int cert)
1831e71b7053SJung-uk Kim {
18327bded2dbSJung-uk Kim     /* Extension ignored for inappropriate versions */
18337bded2dbSJung-uk Kim     if (!SSL_USE_SIGALGS(s))
18341f13597dSJung-uk Kim         return 1;
18351f13597dSJung-uk Kim     /* Should never happen */
1836e71b7053SJung-uk Kim     if (s->cert == NULL)
18371f13597dSJung-uk Kim         return 0;
18381f13597dSJung-uk Kim 
1839e71b7053SJung-uk Kim     if (cert)
1840e71b7053SJung-uk Kim         return tls1_save_u16(pkt, &s->s3->tmp.peer_cert_sigalgs,
1841e71b7053SJung-uk Kim                              &s->s3->tmp.peer_cert_sigalgslen);
1842e71b7053SJung-uk Kim     else
1843e71b7053SJung-uk Kim         return tls1_save_u16(pkt, &s->s3->tmp.peer_sigalgs,
1844e71b7053SJung-uk Kim                              &s->s3->tmp.peer_sigalgslen);
1845e71b7053SJung-uk Kim 
18461f13597dSJung-uk Kim }
18471f13597dSJung-uk Kim 
1848e71b7053SJung-uk Kim /* Set preferred digest for each key type */
1849e71b7053SJung-uk Kim 
18507bded2dbSJung-uk Kim int tls1_process_sigalgs(SSL *s)
18517bded2dbSJung-uk Kim {
18527bded2dbSJung-uk Kim     size_t i;
1853e71b7053SJung-uk Kim     uint32_t *pvalid = s->s3->tmp.valid_flags;
1854e71b7053SJung-uk Kim 
18557bded2dbSJung-uk Kim     if (!tls1_set_shared_sigalgs(s))
18567bded2dbSJung-uk Kim         return 0;
18577bded2dbSJung-uk Kim 
1858e71b7053SJung-uk Kim     for (i = 0; i < SSL_PKEY_NUM; i++)
1859e71b7053SJung-uk Kim         pvalid[i] = 0;
18607bded2dbSJung-uk Kim 
1861da327cd2SJung-uk Kim     for (i = 0; i < s->shared_sigalgslen; i++) {
1862da327cd2SJung-uk Kim         const SIGALG_LOOKUP *sigptr = s->shared_sigalgs[i];
1863e71b7053SJung-uk Kim         int idx = sigptr->sig_idx;
18641f13597dSJung-uk Kim 
1865e71b7053SJung-uk Kim         /* Ignore PKCS1 based sig algs in TLSv1.3 */
1866e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
1867e71b7053SJung-uk Kim             continue;
1868e71b7053SJung-uk Kim         /* If not disabled indicate we can explicitly sign */
1869e71b7053SJung-uk Kim         if (pvalid[idx] == 0 && !ssl_cert_is_disabled(idx))
1870e71b7053SJung-uk Kim             pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
18717bded2dbSJung-uk Kim     }
18721f13597dSJung-uk Kim     return 1;
18731f13597dSJung-uk Kim }
18741f13597dSJung-uk Kim 
18757bded2dbSJung-uk Kim int SSL_get_sigalgs(SSL *s, int idx,
18767bded2dbSJung-uk Kim                     int *psign, int *phash, int *psignhash,
18777bded2dbSJung-uk Kim                     unsigned char *rsig, unsigned char *rhash)
18787bded2dbSJung-uk Kim {
1879e71b7053SJung-uk Kim     uint16_t *psig = s->s3->tmp.peer_sigalgs;
1880e71b7053SJung-uk Kim     size_t numsigalgs = s->s3->tmp.peer_sigalgslen;
1881e71b7053SJung-uk Kim     if (psig == NULL || numsigalgs > INT_MAX)
18827bded2dbSJung-uk Kim         return 0;
18837bded2dbSJung-uk Kim     if (idx >= 0) {
1884e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu;
1885e71b7053SJung-uk Kim 
1886e71b7053SJung-uk Kim         if (idx >= (int)numsigalgs)
18877bded2dbSJung-uk Kim             return 0;
18887bded2dbSJung-uk Kim         psig += idx;
1889e71b7053SJung-uk Kim         if (rhash != NULL)
1890e71b7053SJung-uk Kim             *rhash = (unsigned char)((*psig >> 8) & 0xff);
1891e71b7053SJung-uk Kim         if (rsig != NULL)
1892e71b7053SJung-uk Kim             *rsig = (unsigned char)(*psig & 0xff);
1893e71b7053SJung-uk Kim         lu = tls1_lookup_sigalg(*psig);
1894e71b7053SJung-uk Kim         if (psign != NULL)
1895e71b7053SJung-uk Kim             *psign = lu != NULL ? lu->sig : NID_undef;
1896e71b7053SJung-uk Kim         if (phash != NULL)
1897e71b7053SJung-uk Kim             *phash = lu != NULL ? lu->hash : NID_undef;
1898e71b7053SJung-uk Kim         if (psignhash != NULL)
1899e71b7053SJung-uk Kim             *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
19007bded2dbSJung-uk Kim     }
1901e71b7053SJung-uk Kim     return (int)numsigalgs;
19027bded2dbSJung-uk Kim }
19037bded2dbSJung-uk Kim 
19047bded2dbSJung-uk Kim int SSL_get_shared_sigalgs(SSL *s, int idx,
19057bded2dbSJung-uk Kim                            int *psign, int *phash, int *psignhash,
19067bded2dbSJung-uk Kim                            unsigned char *rsig, unsigned char *rhash)
19077bded2dbSJung-uk Kim {
1908e71b7053SJung-uk Kim     const SIGALG_LOOKUP *shsigalgs;
1909da327cd2SJung-uk Kim     if (s->shared_sigalgs == NULL
1910e71b7053SJung-uk Kim         || idx < 0
1911da327cd2SJung-uk Kim         || idx >= (int)s->shared_sigalgslen
1912da327cd2SJung-uk Kim         || s->shared_sigalgslen > INT_MAX)
19137bded2dbSJung-uk Kim         return 0;
1914da327cd2SJung-uk Kim     shsigalgs = s->shared_sigalgs[idx];
1915e71b7053SJung-uk Kim     if (phash != NULL)
1916e71b7053SJung-uk Kim         *phash = shsigalgs->hash;
1917e71b7053SJung-uk Kim     if (psign != NULL)
1918e71b7053SJung-uk Kim         *psign = shsigalgs->sig;
1919e71b7053SJung-uk Kim     if (psignhash != NULL)
1920e71b7053SJung-uk Kim         *psignhash = shsigalgs->sigandhash;
1921e71b7053SJung-uk Kim     if (rsig != NULL)
1922e71b7053SJung-uk Kim         *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
1923e71b7053SJung-uk Kim     if (rhash != NULL)
1924e71b7053SJung-uk Kim         *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
1925da327cd2SJung-uk Kim     return (int)s->shared_sigalgslen;
19267bded2dbSJung-uk Kim }
19271f13597dSJung-uk Kim 
1928e71b7053SJung-uk Kim /* Maximum possible number of unique entries in sigalgs array */
1929e71b7053SJung-uk Kim #define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
19307bded2dbSJung-uk Kim 
19317bded2dbSJung-uk Kim typedef struct {
19327bded2dbSJung-uk Kim     size_t sigalgcnt;
1933e71b7053SJung-uk Kim     /* TLSEXT_SIGALG_XXX values */
1934e71b7053SJung-uk Kim     uint16_t sigalgs[TLS_MAX_SIGALGCNT];
19357bded2dbSJung-uk Kim } sig_cb_st;
19367bded2dbSJung-uk Kim 
1937e71b7053SJung-uk Kim static void get_sigorhash(int *psig, int *phash, const char *str)
1938e71b7053SJung-uk Kim {
1939e71b7053SJung-uk Kim     if (strcmp(str, "RSA") == 0) {
1940e71b7053SJung-uk Kim         *psig = EVP_PKEY_RSA;
1941e71b7053SJung-uk Kim     } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
1942e71b7053SJung-uk Kim         *psig = EVP_PKEY_RSA_PSS;
1943e71b7053SJung-uk Kim     } else if (strcmp(str, "DSA") == 0) {
1944e71b7053SJung-uk Kim         *psig = EVP_PKEY_DSA;
1945e71b7053SJung-uk Kim     } else if (strcmp(str, "ECDSA") == 0) {
1946e71b7053SJung-uk Kim         *psig = EVP_PKEY_EC;
1947e71b7053SJung-uk Kim     } else {
1948e71b7053SJung-uk Kim         *phash = OBJ_sn2nid(str);
1949e71b7053SJung-uk Kim         if (*phash == NID_undef)
1950e71b7053SJung-uk Kim             *phash = OBJ_ln2nid(str);
1951e71b7053SJung-uk Kim     }
1952e71b7053SJung-uk Kim }
1953e71b7053SJung-uk Kim /* Maximum length of a signature algorithm string component */
1954e71b7053SJung-uk Kim #define TLS_MAX_SIGSTRING_LEN   40
1955e71b7053SJung-uk Kim 
19567bded2dbSJung-uk Kim static int sig_cb(const char *elem, int len, void *arg)
19577bded2dbSJung-uk Kim {
19587bded2dbSJung-uk Kim     sig_cb_st *sarg = arg;
19597bded2dbSJung-uk Kim     size_t i;
1960e71b7053SJung-uk Kim     const SIGALG_LOOKUP *s;
1961e71b7053SJung-uk Kim     char etmp[TLS_MAX_SIGSTRING_LEN], *p;
1962e71b7053SJung-uk Kim     int sig_alg = NID_undef, hash_alg = NID_undef;
19637bded2dbSJung-uk Kim     if (elem == NULL)
19647bded2dbSJung-uk Kim         return 0;
1965e71b7053SJung-uk Kim     if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
19667bded2dbSJung-uk Kim         return 0;
19677bded2dbSJung-uk Kim     if (len > (int)(sizeof(etmp) - 1))
19687bded2dbSJung-uk Kim         return 0;
19697bded2dbSJung-uk Kim     memcpy(etmp, elem, len);
19707bded2dbSJung-uk Kim     etmp[len] = 0;
19717bded2dbSJung-uk Kim     p = strchr(etmp, '+');
1972e71b7053SJung-uk Kim     /*
1973e71b7053SJung-uk Kim      * We only allow SignatureSchemes listed in the sigalg_lookup_tbl;
1974e71b7053SJung-uk Kim      * if there's no '+' in the provided name, look for the new-style combined
1975e71b7053SJung-uk Kim      * name.  If not, match both sig+hash to find the needed SIGALG_LOOKUP.
1976e71b7053SJung-uk Kim      * Just sig+hash is not unique since TLS 1.3 adds rsa_pss_pss_* and
1977e71b7053SJung-uk Kim      * rsa_pss_rsae_* that differ only by public key OID; in such cases
1978e71b7053SJung-uk Kim      * we will pick the _rsae_ variant, by virtue of them appearing earlier
1979e71b7053SJung-uk Kim      * in the table.
1980e71b7053SJung-uk Kim      */
1981e71b7053SJung-uk Kim     if (p == NULL) {
1982e71b7053SJung-uk Kim         for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1983e71b7053SJung-uk Kim              i++, s++) {
1984e71b7053SJung-uk Kim             if (s->name != NULL && strcmp(etmp, s->name) == 0) {
1985e71b7053SJung-uk Kim                 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
1986e71b7053SJung-uk Kim                 break;
1987e71b7053SJung-uk Kim             }
1988e71b7053SJung-uk Kim         }
1989e71b7053SJung-uk Kim         if (i == OSSL_NELEM(sigalg_lookup_tbl))
19907bded2dbSJung-uk Kim             return 0;
1991e71b7053SJung-uk Kim     } else {
19927bded2dbSJung-uk Kim         *p = 0;
19937bded2dbSJung-uk Kim         p++;
1994e71b7053SJung-uk Kim         if (*p == 0)
19957bded2dbSJung-uk Kim             return 0;
1996e71b7053SJung-uk Kim         get_sigorhash(&sig_alg, &hash_alg, etmp);
1997e71b7053SJung-uk Kim         get_sigorhash(&sig_alg, &hash_alg, p);
1998e71b7053SJung-uk Kim         if (sig_alg == NID_undef || hash_alg == NID_undef)
19997bded2dbSJung-uk Kim             return 0;
2000e71b7053SJung-uk Kim         for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
2001e71b7053SJung-uk Kim              i++, s++) {
2002e71b7053SJung-uk Kim             if (s->hash == hash_alg && s->sig == sig_alg) {
2003e71b7053SJung-uk Kim                 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
2004e71b7053SJung-uk Kim                 break;
2005e71b7053SJung-uk Kim             }
2006e71b7053SJung-uk Kim         }
2007e71b7053SJung-uk Kim         if (i == OSSL_NELEM(sigalg_lookup_tbl))
20087bded2dbSJung-uk Kim             return 0;
20097bded2dbSJung-uk Kim     }
2010e71b7053SJung-uk Kim 
2011e71b7053SJung-uk Kim     /* Reject duplicates */
2012e71b7053SJung-uk Kim     for (i = 0; i < sarg->sigalgcnt - 1; i++) {
2013e71b7053SJung-uk Kim         if (sarg->sigalgs[i] == sarg->sigalgs[sarg->sigalgcnt - 1]) {
2014e71b7053SJung-uk Kim             sarg->sigalgcnt--;
2015e71b7053SJung-uk Kim             return 0;
2016e71b7053SJung-uk Kim         }
2017e71b7053SJung-uk Kim     }
20187bded2dbSJung-uk Kim     return 1;
20197bded2dbSJung-uk Kim }
20207bded2dbSJung-uk Kim 
20217bded2dbSJung-uk Kim /*
2022e71b7053SJung-uk Kim  * Set supported signature algorithms based on a colon separated list of the
20237bded2dbSJung-uk Kim  * form sig+hash e.g. RSA+SHA512:DSA+SHA512
20247bded2dbSJung-uk Kim  */
20257bded2dbSJung-uk Kim int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
20267bded2dbSJung-uk Kim {
20277bded2dbSJung-uk Kim     sig_cb_st sig;
20287bded2dbSJung-uk Kim     sig.sigalgcnt = 0;
20297bded2dbSJung-uk Kim     if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
20307bded2dbSJung-uk Kim         return 0;
20317bded2dbSJung-uk Kim     if (c == NULL)
20327bded2dbSJung-uk Kim         return 1;
2033e71b7053SJung-uk Kim     return tls1_set_raw_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
20347bded2dbSJung-uk Kim }
20357bded2dbSJung-uk Kim 
2036e71b7053SJung-uk Kim int tls1_set_raw_sigalgs(CERT *c, const uint16_t *psigs, size_t salglen,
20377bded2dbSJung-uk Kim                      int client)
20387bded2dbSJung-uk Kim {
2039e71b7053SJung-uk Kim     uint16_t *sigalgs;
20407bded2dbSJung-uk Kim 
2041e71b7053SJung-uk Kim     if ((sigalgs = OPENSSL_malloc(salglen * sizeof(*sigalgs))) == NULL) {
2042e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_RAW_SIGALGS, ERR_R_MALLOC_FAILURE);
2043e71b7053SJung-uk Kim         return 0;
20447bded2dbSJung-uk Kim     }
2045e71b7053SJung-uk Kim     memcpy(sigalgs, psigs, salglen * sizeof(*sigalgs));
20467bded2dbSJung-uk Kim 
20477bded2dbSJung-uk Kim     if (client) {
20487bded2dbSJung-uk Kim         OPENSSL_free(c->client_sigalgs);
20497bded2dbSJung-uk Kim         c->client_sigalgs = sigalgs;
20507bded2dbSJung-uk Kim         c->client_sigalgslen = salglen;
20517bded2dbSJung-uk Kim     } else {
20527bded2dbSJung-uk Kim         OPENSSL_free(c->conf_sigalgs);
20537bded2dbSJung-uk Kim         c->conf_sigalgs = sigalgs;
20547bded2dbSJung-uk Kim         c->conf_sigalgslen = salglen;
20557bded2dbSJung-uk Kim     }
20567bded2dbSJung-uk Kim 
20577bded2dbSJung-uk Kim     return 1;
2058e71b7053SJung-uk Kim }
2059e71b7053SJung-uk Kim 
2060e71b7053SJung-uk Kim int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
2061e71b7053SJung-uk Kim {
2062e71b7053SJung-uk Kim     uint16_t *sigalgs, *sptr;
2063e71b7053SJung-uk Kim     size_t i;
2064e71b7053SJung-uk Kim 
2065e71b7053SJung-uk Kim     if (salglen & 1)
2066e71b7053SJung-uk Kim         return 0;
2067e71b7053SJung-uk Kim     if ((sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs))) == NULL) {
2068e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_SIGALGS, ERR_R_MALLOC_FAILURE);
2069e71b7053SJung-uk Kim         return 0;
2070e71b7053SJung-uk Kim     }
2071e71b7053SJung-uk Kim     for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
2072e71b7053SJung-uk Kim         size_t j;
2073e71b7053SJung-uk Kim         const SIGALG_LOOKUP *curr;
2074e71b7053SJung-uk Kim         int md_id = *psig_nids++;
2075e71b7053SJung-uk Kim         int sig_id = *psig_nids++;
2076e71b7053SJung-uk Kim 
2077e71b7053SJung-uk Kim         for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
2078e71b7053SJung-uk Kim              j++, curr++) {
2079e71b7053SJung-uk Kim             if (curr->hash == md_id && curr->sig == sig_id) {
2080e71b7053SJung-uk Kim                 *sptr++ = curr->sigalg;
2081e71b7053SJung-uk Kim                 break;
2082e71b7053SJung-uk Kim             }
2083e71b7053SJung-uk Kim         }
2084e71b7053SJung-uk Kim 
2085e71b7053SJung-uk Kim         if (j == OSSL_NELEM(sigalg_lookup_tbl))
2086e71b7053SJung-uk Kim             goto err;
2087e71b7053SJung-uk Kim     }
2088e71b7053SJung-uk Kim 
2089e71b7053SJung-uk Kim     if (client) {
2090e71b7053SJung-uk Kim         OPENSSL_free(c->client_sigalgs);
2091e71b7053SJung-uk Kim         c->client_sigalgs = sigalgs;
2092e71b7053SJung-uk Kim         c->client_sigalgslen = salglen / 2;
2093e71b7053SJung-uk Kim     } else {
2094e71b7053SJung-uk Kim         OPENSSL_free(c->conf_sigalgs);
2095e71b7053SJung-uk Kim         c->conf_sigalgs = sigalgs;
2096e71b7053SJung-uk Kim         c->conf_sigalgslen = salglen / 2;
2097e71b7053SJung-uk Kim     }
2098e71b7053SJung-uk Kim 
2099e71b7053SJung-uk Kim     return 1;
21007bded2dbSJung-uk Kim 
21017bded2dbSJung-uk Kim  err:
21027bded2dbSJung-uk Kim     OPENSSL_free(sigalgs);
21037bded2dbSJung-uk Kim     return 0;
21047bded2dbSJung-uk Kim }
21057bded2dbSJung-uk Kim 
2106da327cd2SJung-uk Kim static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
21077bded2dbSJung-uk Kim {
2108da327cd2SJung-uk Kim     int sig_nid, use_pc_sigalgs = 0;
21097bded2dbSJung-uk Kim     size_t i;
2110da327cd2SJung-uk Kim     const SIGALG_LOOKUP *sigalg;
2111da327cd2SJung-uk Kim     size_t sigalgslen;
21127bded2dbSJung-uk Kim     if (default_nid == -1)
21137bded2dbSJung-uk Kim         return 1;
21147bded2dbSJung-uk Kim     sig_nid = X509_get_signature_nid(x);
21157bded2dbSJung-uk Kim     if (default_nid)
21167bded2dbSJung-uk Kim         return sig_nid == default_nid ? 1 : 0;
2117da327cd2SJung-uk Kim 
2118da327cd2SJung-uk Kim     if (SSL_IS_TLS13(s) && s->s3->tmp.peer_cert_sigalgs != NULL) {
2119da327cd2SJung-uk Kim         /*
2120da327cd2SJung-uk Kim          * If we're in TLSv1.3 then we only get here if we're checking the
2121da327cd2SJung-uk Kim          * chain. If the peer has specified peer_cert_sigalgs then we use them
2122da327cd2SJung-uk Kim          * otherwise we default to normal sigalgs.
2123da327cd2SJung-uk Kim          */
2124da327cd2SJung-uk Kim         sigalgslen = s->s3->tmp.peer_cert_sigalgslen;
2125da327cd2SJung-uk Kim         use_pc_sigalgs = 1;
2126da327cd2SJung-uk Kim     } else {
2127da327cd2SJung-uk Kim         sigalgslen = s->shared_sigalgslen;
2128da327cd2SJung-uk Kim     }
2129da327cd2SJung-uk Kim     for (i = 0; i < sigalgslen; i++) {
2130da327cd2SJung-uk Kim         sigalg = use_pc_sigalgs
2131da327cd2SJung-uk Kim                  ? tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i])
2132da327cd2SJung-uk Kim                  : s->shared_sigalgs[i];
2133da327cd2SJung-uk Kim         if (sig_nid == sigalg->sigandhash)
21347bded2dbSJung-uk Kim             return 1;
2135da327cd2SJung-uk Kim     }
21367bded2dbSJung-uk Kim     return 0;
21377bded2dbSJung-uk Kim }
21387bded2dbSJung-uk Kim 
21397bded2dbSJung-uk Kim /* Check to see if a certificate issuer name matches list of CA names */
21407bded2dbSJung-uk Kim static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
21417bded2dbSJung-uk Kim {
21427bded2dbSJung-uk Kim     X509_NAME *nm;
21437bded2dbSJung-uk Kim     int i;
21447bded2dbSJung-uk Kim     nm = X509_get_issuer_name(x);
21457bded2dbSJung-uk Kim     for (i = 0; i < sk_X509_NAME_num(names); i++) {
21467bded2dbSJung-uk Kim         if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
21477bded2dbSJung-uk Kim             return 1;
21487bded2dbSJung-uk Kim     }
21497bded2dbSJung-uk Kim     return 0;
21507bded2dbSJung-uk Kim }
21517bded2dbSJung-uk Kim 
21527bded2dbSJung-uk Kim /*
21537bded2dbSJung-uk Kim  * Check certificate chain is consistent with TLS extensions and is usable by
21547bded2dbSJung-uk Kim  * server. This servers two purposes: it allows users to check chains before
21557bded2dbSJung-uk Kim  * passing them to the server and it allows the server to check chains before
21567bded2dbSJung-uk Kim  * attempting to use them.
21577bded2dbSJung-uk Kim  */
21587bded2dbSJung-uk Kim 
2159e71b7053SJung-uk Kim /* Flags which need to be set for a certificate when strict mode not set */
21607bded2dbSJung-uk Kim 
21617bded2dbSJung-uk Kim #define CERT_PKEY_VALID_FLAGS \
21627bded2dbSJung-uk Kim         (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
21637bded2dbSJung-uk Kim /* Strict mode flags */
21647bded2dbSJung-uk Kim #define CERT_PKEY_STRICT_FLAGS \
21657bded2dbSJung-uk Kim          (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
21667bded2dbSJung-uk Kim          | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
21677bded2dbSJung-uk Kim 
21687bded2dbSJung-uk Kim int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
21697bded2dbSJung-uk Kim                      int idx)
21707bded2dbSJung-uk Kim {
21717bded2dbSJung-uk Kim     int i;
21727bded2dbSJung-uk Kim     int rv = 0;
21737bded2dbSJung-uk Kim     int check_flags = 0, strict_mode;
21747bded2dbSJung-uk Kim     CERT_PKEY *cpk = NULL;
21757bded2dbSJung-uk Kim     CERT *c = s->cert;
2176e71b7053SJung-uk Kim     uint32_t *pvalid;
21777bded2dbSJung-uk Kim     unsigned int suiteb_flags = tls1_suiteb(s);
21787bded2dbSJung-uk Kim     /* idx == -1 means checking server chains */
21797bded2dbSJung-uk Kim     if (idx != -1) {
21807bded2dbSJung-uk Kim         /* idx == -2 means checking client certificate chains */
21817bded2dbSJung-uk Kim         if (idx == -2) {
21827bded2dbSJung-uk Kim             cpk = c->key;
2183e71b7053SJung-uk Kim             idx = (int)(cpk - c->pkeys);
21847bded2dbSJung-uk Kim         } else
21857bded2dbSJung-uk Kim             cpk = c->pkeys + idx;
2186e71b7053SJung-uk Kim         pvalid = s->s3->tmp.valid_flags + idx;
21877bded2dbSJung-uk Kim         x = cpk->x509;
21887bded2dbSJung-uk Kim         pk = cpk->privatekey;
21897bded2dbSJung-uk Kim         chain = cpk->chain;
21907bded2dbSJung-uk Kim         strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
21917bded2dbSJung-uk Kim         /* If no cert or key, forget it */
21927bded2dbSJung-uk Kim         if (!x || !pk)
21937bded2dbSJung-uk Kim             goto end;
21947bded2dbSJung-uk Kim     } else {
2195e71b7053SJung-uk Kim         size_t certidx;
2196e71b7053SJung-uk Kim 
21977bded2dbSJung-uk Kim         if (!x || !pk)
21987bded2dbSJung-uk Kim             return 0;
2199e71b7053SJung-uk Kim 
2200e71b7053SJung-uk Kim         if (ssl_cert_lookup_by_pkey(pk, &certidx) == NULL)
22017bded2dbSJung-uk Kim             return 0;
2202e71b7053SJung-uk Kim         idx = certidx;
2203e71b7053SJung-uk Kim         pvalid = s->s3->tmp.valid_flags + idx;
2204e71b7053SJung-uk Kim 
22057bded2dbSJung-uk Kim         if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
22067bded2dbSJung-uk Kim             check_flags = CERT_PKEY_STRICT_FLAGS;
22077bded2dbSJung-uk Kim         else
22087bded2dbSJung-uk Kim             check_flags = CERT_PKEY_VALID_FLAGS;
22097bded2dbSJung-uk Kim         strict_mode = 1;
22107bded2dbSJung-uk Kim     }
22117bded2dbSJung-uk Kim 
22127bded2dbSJung-uk Kim     if (suiteb_flags) {
22137bded2dbSJung-uk Kim         int ok;
22147bded2dbSJung-uk Kim         if (check_flags)
22157bded2dbSJung-uk Kim             check_flags |= CERT_PKEY_SUITEB;
22167bded2dbSJung-uk Kim         ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
22177bded2dbSJung-uk Kim         if (ok == X509_V_OK)
22187bded2dbSJung-uk Kim             rv |= CERT_PKEY_SUITEB;
22197bded2dbSJung-uk Kim         else if (!check_flags)
22207bded2dbSJung-uk Kim             goto end;
22217bded2dbSJung-uk Kim     }
22227bded2dbSJung-uk Kim 
22237bded2dbSJung-uk Kim     /*
22247bded2dbSJung-uk Kim      * Check all signature algorithms are consistent with signature
22257bded2dbSJung-uk Kim      * algorithms extension if TLS 1.2 or later and strict mode.
22267bded2dbSJung-uk Kim      */
22277bded2dbSJung-uk Kim     if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
22287bded2dbSJung-uk Kim         int default_nid;
2229e71b7053SJung-uk Kim         int rsign = 0;
2230e71b7053SJung-uk Kim         if (s->s3->tmp.peer_cert_sigalgs != NULL
2231e71b7053SJung-uk Kim                 || s->s3->tmp.peer_sigalgs != NULL) {
22327bded2dbSJung-uk Kim             default_nid = 0;
22337bded2dbSJung-uk Kim         /* If no sigalgs extension use defaults from RFC5246 */
2234e71b7053SJung-uk Kim         } else {
22357bded2dbSJung-uk Kim             switch (idx) {
2236e71b7053SJung-uk Kim             case SSL_PKEY_RSA:
2237e71b7053SJung-uk Kim                 rsign = EVP_PKEY_RSA;
22387bded2dbSJung-uk Kim                 default_nid = NID_sha1WithRSAEncryption;
22397bded2dbSJung-uk Kim                 break;
22407bded2dbSJung-uk Kim 
22417bded2dbSJung-uk Kim             case SSL_PKEY_DSA_SIGN:
2242e71b7053SJung-uk Kim                 rsign = EVP_PKEY_DSA;
22437bded2dbSJung-uk Kim                 default_nid = NID_dsaWithSHA1;
22447bded2dbSJung-uk Kim                 break;
22457bded2dbSJung-uk Kim 
22467bded2dbSJung-uk Kim             case SSL_PKEY_ECC:
2247e71b7053SJung-uk Kim                 rsign = EVP_PKEY_EC;
22487bded2dbSJung-uk Kim                 default_nid = NID_ecdsa_with_SHA1;
22497bded2dbSJung-uk Kim                 break;
22507bded2dbSJung-uk Kim 
2251e71b7053SJung-uk Kim             case SSL_PKEY_GOST01:
2252e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2001;
2253e71b7053SJung-uk Kim                 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
2254e71b7053SJung-uk Kim                 break;
2255e71b7053SJung-uk Kim 
2256e71b7053SJung-uk Kim             case SSL_PKEY_GOST12_256:
2257e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2012_256;
2258e71b7053SJung-uk Kim                 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
2259e71b7053SJung-uk Kim                 break;
2260e71b7053SJung-uk Kim 
2261e71b7053SJung-uk Kim             case SSL_PKEY_GOST12_512:
2262e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2012_512;
2263e71b7053SJung-uk Kim                 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
2264e71b7053SJung-uk Kim                 break;
2265e71b7053SJung-uk Kim 
22667bded2dbSJung-uk Kim             default:
22677bded2dbSJung-uk Kim                 default_nid = -1;
22687bded2dbSJung-uk Kim                 break;
22697bded2dbSJung-uk Kim             }
22707bded2dbSJung-uk Kim         }
22717bded2dbSJung-uk Kim         /*
22727bded2dbSJung-uk Kim          * If peer sent no signature algorithms extension and we have set
22737bded2dbSJung-uk Kim          * preferred signature algorithms check we support sha1.
22747bded2dbSJung-uk Kim          */
22757bded2dbSJung-uk Kim         if (default_nid > 0 && c->conf_sigalgs) {
22767bded2dbSJung-uk Kim             size_t j;
2277e71b7053SJung-uk Kim             const uint16_t *p = c->conf_sigalgs;
2278e71b7053SJung-uk Kim             for (j = 0; j < c->conf_sigalgslen; j++, p++) {
2279e71b7053SJung-uk Kim                 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*p);
2280e71b7053SJung-uk Kim 
2281e71b7053SJung-uk Kim                 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
22827bded2dbSJung-uk Kim                     break;
22837bded2dbSJung-uk Kim             }
22847bded2dbSJung-uk Kim             if (j == c->conf_sigalgslen) {
22857bded2dbSJung-uk Kim                 if (check_flags)
22867bded2dbSJung-uk Kim                     goto skip_sigs;
22877bded2dbSJung-uk Kim                 else
22887bded2dbSJung-uk Kim                     goto end;
22897bded2dbSJung-uk Kim             }
22907bded2dbSJung-uk Kim         }
22917bded2dbSJung-uk Kim         /* Check signature algorithm of each cert in chain */
2292da327cd2SJung-uk Kim         if (SSL_IS_TLS13(s)) {
2293da327cd2SJung-uk Kim             /*
2294da327cd2SJung-uk Kim              * We only get here if the application has called SSL_check_chain(),
2295da327cd2SJung-uk Kim              * so check_flags is always set.
2296da327cd2SJung-uk Kim              */
2297da327cd2SJung-uk Kim             if (find_sig_alg(s, x, pk) != NULL)
2298da327cd2SJung-uk Kim                 rv |= CERT_PKEY_EE_SIGNATURE;
2299da327cd2SJung-uk Kim         } else if (!tls1_check_sig_alg(s, x, default_nid)) {
23007bded2dbSJung-uk Kim             if (!check_flags)
23017bded2dbSJung-uk Kim                 goto end;
23027bded2dbSJung-uk Kim         } else
23037bded2dbSJung-uk Kim             rv |= CERT_PKEY_EE_SIGNATURE;
23047bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_SIGNATURE;
23057bded2dbSJung-uk Kim         for (i = 0; i < sk_X509_num(chain); i++) {
2306da327cd2SJung-uk Kim             if (!tls1_check_sig_alg(s, sk_X509_value(chain, i), default_nid)) {
23077bded2dbSJung-uk Kim                 if (check_flags) {
23087bded2dbSJung-uk Kim                     rv &= ~CERT_PKEY_CA_SIGNATURE;
23097bded2dbSJung-uk Kim                     break;
23107bded2dbSJung-uk Kim                 } else
23117bded2dbSJung-uk Kim                     goto end;
23127bded2dbSJung-uk Kim             }
23137bded2dbSJung-uk Kim         }
23147bded2dbSJung-uk Kim     }
23157bded2dbSJung-uk Kim     /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
23167bded2dbSJung-uk Kim     else if (check_flags)
23177bded2dbSJung-uk Kim         rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
23187bded2dbSJung-uk Kim  skip_sigs:
23197bded2dbSJung-uk Kim     /* Check cert parameters are consistent */
2320e71b7053SJung-uk Kim     if (tls1_check_cert_param(s, x, 1))
23217bded2dbSJung-uk Kim         rv |= CERT_PKEY_EE_PARAM;
23227bded2dbSJung-uk Kim     else if (!check_flags)
23237bded2dbSJung-uk Kim         goto end;
23247bded2dbSJung-uk Kim     if (!s->server)
23257bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_PARAM;
23267bded2dbSJung-uk Kim     /* In strict mode check rest of chain too */
23277bded2dbSJung-uk Kim     else if (strict_mode) {
23287bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_PARAM;
23297bded2dbSJung-uk Kim         for (i = 0; i < sk_X509_num(chain); i++) {
23307bded2dbSJung-uk Kim             X509 *ca = sk_X509_value(chain, i);
23317bded2dbSJung-uk Kim             if (!tls1_check_cert_param(s, ca, 0)) {
23327bded2dbSJung-uk Kim                 if (check_flags) {
23337bded2dbSJung-uk Kim                     rv &= ~CERT_PKEY_CA_PARAM;
23347bded2dbSJung-uk Kim                     break;
23357bded2dbSJung-uk Kim                 } else
23367bded2dbSJung-uk Kim                     goto end;
23377bded2dbSJung-uk Kim             }
23387bded2dbSJung-uk Kim         }
23397bded2dbSJung-uk Kim     }
23407bded2dbSJung-uk Kim     if (!s->server && strict_mode) {
23417bded2dbSJung-uk Kim         STACK_OF(X509_NAME) *ca_dn;
23427bded2dbSJung-uk Kim         int check_type = 0;
2343e71b7053SJung-uk Kim         switch (EVP_PKEY_id(pk)) {
23447bded2dbSJung-uk Kim         case EVP_PKEY_RSA:
23457bded2dbSJung-uk Kim             check_type = TLS_CT_RSA_SIGN;
23467bded2dbSJung-uk Kim             break;
23477bded2dbSJung-uk Kim         case EVP_PKEY_DSA:
23487bded2dbSJung-uk Kim             check_type = TLS_CT_DSS_SIGN;
23497bded2dbSJung-uk Kim             break;
23507bded2dbSJung-uk Kim         case EVP_PKEY_EC:
23517bded2dbSJung-uk Kim             check_type = TLS_CT_ECDSA_SIGN;
23527bded2dbSJung-uk Kim             break;
23537bded2dbSJung-uk Kim         }
23547bded2dbSJung-uk Kim         if (check_type) {
2355e71b7053SJung-uk Kim             const uint8_t *ctypes = s->s3->tmp.ctype;
2356e71b7053SJung-uk Kim             size_t j;
2357e71b7053SJung-uk Kim 
2358e71b7053SJung-uk Kim             for (j = 0; j < s->s3->tmp.ctype_len; j++, ctypes++) {
2359e71b7053SJung-uk Kim                 if (*ctypes == check_type) {
23607bded2dbSJung-uk Kim                     rv |= CERT_PKEY_CERT_TYPE;
23617bded2dbSJung-uk Kim                     break;
23627bded2dbSJung-uk Kim                 }
23637bded2dbSJung-uk Kim             }
23647bded2dbSJung-uk Kim             if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
23657bded2dbSJung-uk Kim                 goto end;
2366e71b7053SJung-uk Kim         } else {
23677bded2dbSJung-uk Kim             rv |= CERT_PKEY_CERT_TYPE;
2368e71b7053SJung-uk Kim         }
23697bded2dbSJung-uk Kim 
2370e71b7053SJung-uk Kim         ca_dn = s->s3->tmp.peer_ca_names;
23717bded2dbSJung-uk Kim 
23727bded2dbSJung-uk Kim         if (!sk_X509_NAME_num(ca_dn))
23737bded2dbSJung-uk Kim             rv |= CERT_PKEY_ISSUER_NAME;
23747bded2dbSJung-uk Kim 
23757bded2dbSJung-uk Kim         if (!(rv & CERT_PKEY_ISSUER_NAME)) {
23767bded2dbSJung-uk Kim             if (ssl_check_ca_name(ca_dn, x))
23777bded2dbSJung-uk Kim                 rv |= CERT_PKEY_ISSUER_NAME;
23787bded2dbSJung-uk Kim         }
23797bded2dbSJung-uk Kim         if (!(rv & CERT_PKEY_ISSUER_NAME)) {
23807bded2dbSJung-uk Kim             for (i = 0; i < sk_X509_num(chain); i++) {
23817bded2dbSJung-uk Kim                 X509 *xtmp = sk_X509_value(chain, i);
23827bded2dbSJung-uk Kim                 if (ssl_check_ca_name(ca_dn, xtmp)) {
23837bded2dbSJung-uk Kim                     rv |= CERT_PKEY_ISSUER_NAME;
23847bded2dbSJung-uk Kim                     break;
23857bded2dbSJung-uk Kim                 }
23867bded2dbSJung-uk Kim             }
23877bded2dbSJung-uk Kim         }
23887bded2dbSJung-uk Kim         if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
23897bded2dbSJung-uk Kim             goto end;
23907bded2dbSJung-uk Kim     } else
23917bded2dbSJung-uk Kim         rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
23927bded2dbSJung-uk Kim 
23937bded2dbSJung-uk Kim     if (!check_flags || (rv & check_flags) == check_flags)
23947bded2dbSJung-uk Kim         rv |= CERT_PKEY_VALID;
23957bded2dbSJung-uk Kim 
23967bded2dbSJung-uk Kim  end:
23977bded2dbSJung-uk Kim 
2398e71b7053SJung-uk Kim     if (TLS1_get_version(s) >= TLS1_2_VERSION)
2399e71b7053SJung-uk Kim         rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2400e71b7053SJung-uk Kim     else
24017bded2dbSJung-uk Kim         rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
24027bded2dbSJung-uk Kim 
24037bded2dbSJung-uk Kim     /*
24047bded2dbSJung-uk Kim      * When checking a CERT_PKEY structure all flags are irrelevant if the
24057bded2dbSJung-uk Kim      * chain is invalid.
24067bded2dbSJung-uk Kim      */
24077bded2dbSJung-uk Kim     if (!check_flags) {
2408e71b7053SJung-uk Kim         if (rv & CERT_PKEY_VALID) {
2409e71b7053SJung-uk Kim             *pvalid = rv;
2410e71b7053SJung-uk Kim         } else {
2411e71b7053SJung-uk Kim             /* Preserve sign and explicit sign flag, clear rest */
2412e71b7053SJung-uk Kim             *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
24137bded2dbSJung-uk Kim             return 0;
24147bded2dbSJung-uk Kim         }
24157bded2dbSJung-uk Kim     }
24167bded2dbSJung-uk Kim     return rv;
24177bded2dbSJung-uk Kim }
24187bded2dbSJung-uk Kim 
24197bded2dbSJung-uk Kim /* Set validity of certificates in an SSL structure */
24207bded2dbSJung-uk Kim void tls1_set_cert_validity(SSL *s)
24217bded2dbSJung-uk Kim {
2422e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
2423e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_PSS_SIGN);
24247bded2dbSJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
24257bded2dbSJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
2426e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2427e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2428e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
2429e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED25519);
2430e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED448);
24317bded2dbSJung-uk Kim }
24327bded2dbSJung-uk Kim 
2433e71b7053SJung-uk Kim /* User level utility function to check a chain is suitable */
24347bded2dbSJung-uk Kim int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
24357bded2dbSJung-uk Kim {
24367bded2dbSJung-uk Kim     return tls1_check_chain(s, x, pk, chain, -1);
24377bded2dbSJung-uk Kim }
24387bded2dbSJung-uk Kim 
2439e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DH
2440e71b7053SJung-uk Kim DH *ssl_get_auto_dh(SSL *s)
2441e71b7053SJung-uk Kim {
2442e71b7053SJung-uk Kim     int dh_secbits = 80;
2443e71b7053SJung-uk Kim     if (s->cert->dh_tmp_auto == 2)
2444e71b7053SJung-uk Kim         return DH_get_1024_160();
2445e71b7053SJung-uk Kim     if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
2446e71b7053SJung-uk Kim         if (s->s3->tmp.new_cipher->strength_bits == 256)
2447e71b7053SJung-uk Kim             dh_secbits = 128;
2448e71b7053SJung-uk Kim         else
2449e71b7053SJung-uk Kim             dh_secbits = 80;
2450e71b7053SJung-uk Kim     } else {
2451e71b7053SJung-uk Kim         if (s->s3->tmp.cert == NULL)
2452e71b7053SJung-uk Kim             return NULL;
2453e71b7053SJung-uk Kim         dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
2454e71b7053SJung-uk Kim     }
2455e71b7053SJung-uk Kim 
2456e71b7053SJung-uk Kim     if (dh_secbits >= 128) {
2457e71b7053SJung-uk Kim         DH *dhp = DH_new();
2458e71b7053SJung-uk Kim         BIGNUM *p, *g;
2459e71b7053SJung-uk Kim         if (dhp == NULL)
2460e71b7053SJung-uk Kim             return NULL;
2461e71b7053SJung-uk Kim         g = BN_new();
2462e71b7053SJung-uk Kim         if (g == NULL || !BN_set_word(g, 2)) {
2463e71b7053SJung-uk Kim             DH_free(dhp);
2464e71b7053SJung-uk Kim             BN_free(g);
2465e71b7053SJung-uk Kim             return NULL;
2466e71b7053SJung-uk Kim         }
2467e71b7053SJung-uk Kim         if (dh_secbits >= 192)
2468e71b7053SJung-uk Kim             p = BN_get_rfc3526_prime_8192(NULL);
2469e71b7053SJung-uk Kim         else
2470e71b7053SJung-uk Kim             p = BN_get_rfc3526_prime_3072(NULL);
2471e71b7053SJung-uk Kim         if (p == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
2472e71b7053SJung-uk Kim             DH_free(dhp);
2473e71b7053SJung-uk Kim             BN_free(p);
2474e71b7053SJung-uk Kim             BN_free(g);
2475e71b7053SJung-uk Kim             return NULL;
2476e71b7053SJung-uk Kim         }
2477e71b7053SJung-uk Kim         return dhp;
2478e71b7053SJung-uk Kim     }
2479e71b7053SJung-uk Kim     if (dh_secbits >= 112)
2480e71b7053SJung-uk Kim         return DH_get_2048_224();
2481e71b7053SJung-uk Kim     return DH_get_1024_160();
2482e71b7053SJung-uk Kim }
24837bded2dbSJung-uk Kim #endif
2484e71b7053SJung-uk Kim 
2485e71b7053SJung-uk Kim static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2486e71b7053SJung-uk Kim {
2487e71b7053SJung-uk Kim     int secbits = -1;
2488e71b7053SJung-uk Kim     EVP_PKEY *pkey = X509_get0_pubkey(x);
2489e71b7053SJung-uk Kim     if (pkey) {
2490e71b7053SJung-uk Kim         /*
2491e71b7053SJung-uk Kim          * If no parameters this will return -1 and fail using the default
2492e71b7053SJung-uk Kim          * security callback for any non-zero security level. This will
2493e71b7053SJung-uk Kim          * reject keys which omit parameters but this only affects DSA and
2494e71b7053SJung-uk Kim          * omission of parameters is never (?) done in practice.
2495e71b7053SJung-uk Kim          */
2496e71b7053SJung-uk Kim         secbits = EVP_PKEY_security_bits(pkey);
2497e71b7053SJung-uk Kim     }
2498e71b7053SJung-uk Kim     if (s)
2499e71b7053SJung-uk Kim         return ssl_security(s, op, secbits, 0, x);
2500e71b7053SJung-uk Kim     else
2501e71b7053SJung-uk Kim         return ssl_ctx_security(ctx, op, secbits, 0, x);
2502e71b7053SJung-uk Kim }
2503e71b7053SJung-uk Kim 
2504e71b7053SJung-uk Kim static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2505e71b7053SJung-uk Kim {
2506e71b7053SJung-uk Kim     /* Lookup signature algorithm digest */
2507e71b7053SJung-uk Kim     int secbits, nid, pknid;
2508e71b7053SJung-uk Kim     /* Don't check signature if self signed */
2509e71b7053SJung-uk Kim     if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2510e71b7053SJung-uk Kim         return 1;
2511e71b7053SJung-uk Kim     if (!X509_get_signature_info(x, &nid, &pknid, &secbits, NULL))
2512e71b7053SJung-uk Kim         secbits = -1;
2513e71b7053SJung-uk Kim     /* If digest NID not defined use signature NID */
2514e71b7053SJung-uk Kim     if (nid == NID_undef)
2515e71b7053SJung-uk Kim         nid = pknid;
2516e71b7053SJung-uk Kim     if (s)
2517e71b7053SJung-uk Kim         return ssl_security(s, op, secbits, nid, x);
2518e71b7053SJung-uk Kim     else
2519e71b7053SJung-uk Kim         return ssl_ctx_security(ctx, op, secbits, nid, x);
2520e71b7053SJung-uk Kim }
2521e71b7053SJung-uk Kim 
2522e71b7053SJung-uk Kim int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
2523e71b7053SJung-uk Kim {
2524e71b7053SJung-uk Kim     if (vfy)
2525e71b7053SJung-uk Kim         vfy = SSL_SECOP_PEER;
2526e71b7053SJung-uk Kim     if (is_ee) {
2527e71b7053SJung-uk Kim         if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2528e71b7053SJung-uk Kim             return SSL_R_EE_KEY_TOO_SMALL;
2529e71b7053SJung-uk Kim     } else {
2530e71b7053SJung-uk Kim         if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2531e71b7053SJung-uk Kim             return SSL_R_CA_KEY_TOO_SMALL;
2532e71b7053SJung-uk Kim     }
2533e71b7053SJung-uk Kim     if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2534e71b7053SJung-uk Kim         return SSL_R_CA_MD_TOO_WEAK;
2535e71b7053SJung-uk Kim     return 1;
2536e71b7053SJung-uk Kim }
2537e71b7053SJung-uk Kim 
2538e71b7053SJung-uk Kim /*
2539e71b7053SJung-uk Kim  * Check security of a chain, if |sk| includes the end entity certificate then
2540e71b7053SJung-uk Kim  * |x| is NULL. If |vfy| is 1 then we are verifying a peer chain and not sending
2541e71b7053SJung-uk Kim  * one to the peer. Return values: 1 if ok otherwise error code to use
2542e71b7053SJung-uk Kim  */
2543e71b7053SJung-uk Kim 
2544e71b7053SJung-uk Kim int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
2545e71b7053SJung-uk Kim {
2546e71b7053SJung-uk Kim     int rv, start_idx, i;
2547e71b7053SJung-uk Kim     if (x == NULL) {
2548e71b7053SJung-uk Kim         x = sk_X509_value(sk, 0);
2549e71b7053SJung-uk Kim         start_idx = 1;
2550e71b7053SJung-uk Kim     } else
2551e71b7053SJung-uk Kim         start_idx = 0;
2552e71b7053SJung-uk Kim 
2553e71b7053SJung-uk Kim     rv = ssl_security_cert(s, NULL, x, vfy, 1);
2554e71b7053SJung-uk Kim     if (rv != 1)
2555e71b7053SJung-uk Kim         return rv;
2556e71b7053SJung-uk Kim 
2557e71b7053SJung-uk Kim     for (i = start_idx; i < sk_X509_num(sk); i++) {
2558e71b7053SJung-uk Kim         x = sk_X509_value(sk, i);
2559e71b7053SJung-uk Kim         rv = ssl_security_cert(s, NULL, x, vfy, 0);
2560e71b7053SJung-uk Kim         if (rv != 1)
2561e71b7053SJung-uk Kim             return rv;
2562e71b7053SJung-uk Kim     }
2563e71b7053SJung-uk Kim     return 1;
2564e71b7053SJung-uk Kim }
2565e71b7053SJung-uk Kim 
2566e71b7053SJung-uk Kim /*
2567e71b7053SJung-uk Kim  * For TLS 1.2 servers check if we have a certificate which can be used
2568e71b7053SJung-uk Kim  * with the signature algorithm "lu" and return index of certificate.
2569e71b7053SJung-uk Kim  */
2570e71b7053SJung-uk Kim 
2571e71b7053SJung-uk Kim static int tls12_get_cert_sigalg_idx(const SSL *s, const SIGALG_LOOKUP *lu)
2572e71b7053SJung-uk Kim {
2573e71b7053SJung-uk Kim     int sig_idx = lu->sig_idx;
2574e71b7053SJung-uk Kim     const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(sig_idx);
2575e71b7053SJung-uk Kim 
2576e71b7053SJung-uk Kim     /* If not recognised or not supported by cipher mask it is not suitable */
2577e71b7053SJung-uk Kim     if (clu == NULL
2578e71b7053SJung-uk Kim             || (clu->amask & s->s3->tmp.new_cipher->algorithm_auth) == 0
2579e71b7053SJung-uk Kim             || (clu->nid == EVP_PKEY_RSA_PSS
2580e71b7053SJung-uk Kim                 && (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kRSA) != 0))
2581e71b7053SJung-uk Kim         return -1;
2582e71b7053SJung-uk Kim 
2583e71b7053SJung-uk Kim     return s->s3->tmp.valid_flags[sig_idx] & CERT_PKEY_VALID ? sig_idx : -1;
2584e71b7053SJung-uk Kim }
2585e71b7053SJung-uk Kim 
2586e71b7053SJung-uk Kim /*
2587da327cd2SJung-uk Kim  * Checks the given cert against signature_algorithm_cert restrictions sent by
2588da327cd2SJung-uk Kim  * the peer (if any) as well as whether the hash from the sigalg is usable with
2589da327cd2SJung-uk Kim  * the key.
2590da327cd2SJung-uk Kim  * Returns true if the cert is usable and false otherwise.
2591e71b7053SJung-uk Kim  */
2592da327cd2SJung-uk Kim static int check_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
2593da327cd2SJung-uk Kim                              EVP_PKEY *pkey)
2594e71b7053SJung-uk Kim {
2595e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
25966935a639SJung-uk Kim     int mdnid, pknid, default_mdnid;
2597e71b7053SJung-uk Kim     size_t i;
2598e71b7053SJung-uk Kim 
25996935a639SJung-uk Kim     /* If the EVP_PKEY reports a mandatory digest, allow nothing else. */
26006935a639SJung-uk Kim     ERR_set_mark();
2601da327cd2SJung-uk Kim     if (EVP_PKEY_get_default_digest_nid(pkey, &default_mdnid) == 2 &&
2602da327cd2SJung-uk Kim         sig->hash != default_mdnid)
2603da327cd2SJung-uk Kim             return 0;
2604da327cd2SJung-uk Kim 
2605da327cd2SJung-uk Kim     /* If it didn't report a mandatory NID, for whatever reasons,
26066935a639SJung-uk Kim      * just clear the error and allow all hashes to be used. */
26076935a639SJung-uk Kim     ERR_pop_to_mark();
2608da327cd2SJung-uk Kim 
2609e71b7053SJung-uk Kim     if (s->s3->tmp.peer_cert_sigalgs != NULL) {
2610e71b7053SJung-uk Kim         for (i = 0; i < s->s3->tmp.peer_cert_sigalgslen; i++) {
2611e71b7053SJung-uk Kim             lu = tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i]);
2612e71b7053SJung-uk Kim             if (lu == NULL
2613da327cd2SJung-uk Kim                 || !X509_get_signature_info(x, &mdnid, &pknid, NULL, NULL))
2614e71b7053SJung-uk Kim                 continue;
2615e71b7053SJung-uk Kim             /*
2616e71b7053SJung-uk Kim              * TODO this does not differentiate between the
2617e71b7053SJung-uk Kim              * rsa_pss_pss_* and rsa_pss_rsae_* schemes since we do not
2618e71b7053SJung-uk Kim              * have a chain here that lets us look at the key OID in the
2619e71b7053SJung-uk Kim              * signing certificate.
2620e71b7053SJung-uk Kim              */
2621e71b7053SJung-uk Kim             if (mdnid == lu->hash && pknid == lu->sig)
2622e71b7053SJung-uk Kim                 return 1;
2623e71b7053SJung-uk Kim         }
2624e71b7053SJung-uk Kim         return 0;
2625e71b7053SJung-uk Kim     }
2626da327cd2SJung-uk Kim     return 1;
2627da327cd2SJung-uk Kim }
2628da327cd2SJung-uk Kim 
2629da327cd2SJung-uk Kim /*
2630da327cd2SJung-uk Kim  * Returns true if |s| has a usable certificate configured for use
2631da327cd2SJung-uk Kim  * with signature scheme |sig|.
2632da327cd2SJung-uk Kim  * "Usable" includes a check for presence as well as applying
2633da327cd2SJung-uk Kim  * the signature_algorithm_cert restrictions sent by the peer (if any).
2634da327cd2SJung-uk Kim  * Returns false if no usable certificate is found.
2635da327cd2SJung-uk Kim  */
2636da327cd2SJung-uk Kim static int has_usable_cert(SSL *s, const SIGALG_LOOKUP *sig, int idx)
2637da327cd2SJung-uk Kim {
2638da327cd2SJung-uk Kim     /* TLS 1.2 callers can override sig->sig_idx, but not TLS 1.3 callers. */
2639da327cd2SJung-uk Kim     if (idx == -1)
2640da327cd2SJung-uk Kim         idx = sig->sig_idx;
2641da327cd2SJung-uk Kim     if (!ssl_has_cert(s, idx))
2642da327cd2SJung-uk Kim         return 0;
2643da327cd2SJung-uk Kim 
2644da327cd2SJung-uk Kim     return check_cert_usable(s, sig, s->cert->pkeys[idx].x509,
2645da327cd2SJung-uk Kim                              s->cert->pkeys[idx].privatekey);
2646da327cd2SJung-uk Kim }
2647da327cd2SJung-uk Kim 
2648da327cd2SJung-uk Kim /*
2649da327cd2SJung-uk Kim  * Returns true if the supplied cert |x| and key |pkey| is usable with the
2650da327cd2SJung-uk Kim  * specified signature scheme |sig|, or false otherwise.
2651da327cd2SJung-uk Kim  */
2652da327cd2SJung-uk Kim static int is_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
2653da327cd2SJung-uk Kim                           EVP_PKEY *pkey)
2654da327cd2SJung-uk Kim {
2655da327cd2SJung-uk Kim     size_t idx;
2656da327cd2SJung-uk Kim 
2657da327cd2SJung-uk Kim     if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
2658da327cd2SJung-uk Kim         return 0;
2659da327cd2SJung-uk Kim 
2660da327cd2SJung-uk Kim     /* Check the key is consistent with the sig alg */
2661da327cd2SJung-uk Kim     if ((int)idx != sig->sig_idx)
2662da327cd2SJung-uk Kim         return 0;
2663da327cd2SJung-uk Kim 
2664da327cd2SJung-uk Kim     return check_cert_usable(s, sig, x, pkey);
2665da327cd2SJung-uk Kim }
2666da327cd2SJung-uk Kim 
2667da327cd2SJung-uk Kim /*
2668da327cd2SJung-uk Kim  * Find a signature scheme that works with the supplied certificate |x| and key
2669da327cd2SJung-uk Kim  * |pkey|. |x| and |pkey| may be NULL in which case we additionally look at our
2670da327cd2SJung-uk Kim  * available certs/keys to find one that works.
2671da327cd2SJung-uk Kim  */
2672da327cd2SJung-uk Kim static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey)
2673da327cd2SJung-uk Kim {
2674da327cd2SJung-uk Kim     const SIGALG_LOOKUP *lu = NULL;
2675da327cd2SJung-uk Kim     size_t i;
2676da327cd2SJung-uk Kim #ifndef OPENSSL_NO_EC
2677da327cd2SJung-uk Kim     int curve = -1;
2678da327cd2SJung-uk Kim #endif
2679da327cd2SJung-uk Kim     EVP_PKEY *tmppkey;
2680da327cd2SJung-uk Kim 
2681da327cd2SJung-uk Kim     /* Look for a shared sigalgs matching possible certificates */
2682da327cd2SJung-uk Kim     for (i = 0; i < s->shared_sigalgslen; i++) {
2683da327cd2SJung-uk Kim         lu = s->shared_sigalgs[i];
2684da327cd2SJung-uk Kim 
2685da327cd2SJung-uk Kim         /* Skip SHA1, SHA224, DSA and RSA if not PSS */
2686da327cd2SJung-uk Kim         if (lu->hash == NID_sha1
2687da327cd2SJung-uk Kim             || lu->hash == NID_sha224
2688da327cd2SJung-uk Kim             || lu->sig == EVP_PKEY_DSA
2689da327cd2SJung-uk Kim             || lu->sig == EVP_PKEY_RSA)
2690da327cd2SJung-uk Kim             continue;
2691da327cd2SJung-uk Kim         /* Check that we have a cert, and signature_algorithms_cert */
2692da327cd2SJung-uk Kim         if (!tls1_lookup_md(lu, NULL))
2693da327cd2SJung-uk Kim             continue;
2694da327cd2SJung-uk Kim         if ((pkey == NULL && !has_usable_cert(s, lu, -1))
2695da327cd2SJung-uk Kim                 || (pkey != NULL && !is_cert_usable(s, lu, x, pkey)))
2696da327cd2SJung-uk Kim             continue;
2697da327cd2SJung-uk Kim 
2698da327cd2SJung-uk Kim         tmppkey = (pkey != NULL) ? pkey
2699da327cd2SJung-uk Kim                                  : s->cert->pkeys[lu->sig_idx].privatekey;
2700da327cd2SJung-uk Kim 
2701da327cd2SJung-uk Kim         if (lu->sig == EVP_PKEY_EC) {
2702da327cd2SJung-uk Kim #ifndef OPENSSL_NO_EC
2703da327cd2SJung-uk Kim             if (curve == -1) {
2704da327cd2SJung-uk Kim                 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(tmppkey);
2705da327cd2SJung-uk Kim                 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2706da327cd2SJung-uk Kim             }
2707da327cd2SJung-uk Kim             if (lu->curve != NID_undef && curve != lu->curve)
2708da327cd2SJung-uk Kim                 continue;
2709da327cd2SJung-uk Kim #else
2710da327cd2SJung-uk Kim             continue;
2711da327cd2SJung-uk Kim #endif
2712da327cd2SJung-uk Kim         } else if (lu->sig == EVP_PKEY_RSA_PSS) {
2713da327cd2SJung-uk Kim             /* validate that key is large enough for the signature algorithm */
2714da327cd2SJung-uk Kim             if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(tmppkey), lu))
2715da327cd2SJung-uk Kim                 continue;
2716da327cd2SJung-uk Kim         }
2717da327cd2SJung-uk Kim         break;
2718da327cd2SJung-uk Kim     }
2719da327cd2SJung-uk Kim 
2720da327cd2SJung-uk Kim     if (i == s->shared_sigalgslen)
2721da327cd2SJung-uk Kim         return NULL;
2722da327cd2SJung-uk Kim 
2723da327cd2SJung-uk Kim     return lu;
2724e71b7053SJung-uk Kim }
2725e71b7053SJung-uk Kim 
2726e71b7053SJung-uk Kim /*
2727e71b7053SJung-uk Kim  * Choose an appropriate signature algorithm based on available certificates
2728e71b7053SJung-uk Kim  * Sets chosen certificate and signature algorithm.
2729e71b7053SJung-uk Kim  *
2730e71b7053SJung-uk Kim  * For servers if we fail to find a required certificate it is a fatal error,
2731e71b7053SJung-uk Kim  * an appropriate error code is set and a TLS alert is sent.
2732e71b7053SJung-uk Kim  *
2733e71b7053SJung-uk Kim  * For clients fatalerrs is set to 0. If a certificate is not suitable it is not
2734e71b7053SJung-uk Kim  * a fatal error: we will either try another certificate or not present one
2735e71b7053SJung-uk Kim  * to the server. In this case no error is set.
2736e71b7053SJung-uk Kim  */
2737e71b7053SJung-uk Kim int tls_choose_sigalg(SSL *s, int fatalerrs)
2738e71b7053SJung-uk Kim {
2739e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu = NULL;
2740e71b7053SJung-uk Kim     int sig_idx = -1;
2741e71b7053SJung-uk Kim 
2742e71b7053SJung-uk Kim     s->s3->tmp.cert = NULL;
2743e71b7053SJung-uk Kim     s->s3->tmp.sigalg = NULL;
2744e71b7053SJung-uk Kim 
2745e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s)) {
2746da327cd2SJung-uk Kim         lu = find_sig_alg(s, NULL, NULL);
2747da327cd2SJung-uk Kim         if (lu == NULL) {
2748e71b7053SJung-uk Kim             if (!fatalerrs)
2749e71b7053SJung-uk Kim                 return 1;
2750e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_CHOOSE_SIGALG,
2751e71b7053SJung-uk Kim                      SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2752e71b7053SJung-uk Kim             return 0;
2753e71b7053SJung-uk Kim         }
2754e71b7053SJung-uk Kim     } else {
2755e71b7053SJung-uk Kim         /* If ciphersuite doesn't require a cert nothing to do */
2756e71b7053SJung-uk Kim         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aCERT))
2757e71b7053SJung-uk Kim             return 1;
2758e71b7053SJung-uk Kim         if (!s->server && !ssl_has_cert(s, s->cert->key - s->cert->pkeys))
2759e71b7053SJung-uk Kim                 return 1;
2760e71b7053SJung-uk Kim 
2761e71b7053SJung-uk Kim         if (SSL_USE_SIGALGS(s)) {
2762e71b7053SJung-uk Kim             size_t i;
2763e71b7053SJung-uk Kim             if (s->s3->tmp.peer_sigalgs != NULL) {
2764e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
2765e71b7053SJung-uk Kim                 int curve;
2766e71b7053SJung-uk Kim 
2767e71b7053SJung-uk Kim                 /* For Suite B need to match signature algorithm to curve */
2768e71b7053SJung-uk Kim                 if (tls1_suiteb(s)) {
2769e71b7053SJung-uk Kim                     EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[SSL_PKEY_ECC].privatekey);
2770e71b7053SJung-uk Kim                     curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2771e71b7053SJung-uk Kim                 } else {
2772e71b7053SJung-uk Kim                     curve = -1;
2773e71b7053SJung-uk Kim                 }
2774e71b7053SJung-uk Kim #endif
2775e71b7053SJung-uk Kim 
2776e71b7053SJung-uk Kim                 /*
2777e71b7053SJung-uk Kim                  * Find highest preference signature algorithm matching
2778e71b7053SJung-uk Kim                  * cert type
2779e71b7053SJung-uk Kim                  */
2780da327cd2SJung-uk Kim                 for (i = 0; i < s->shared_sigalgslen; i++) {
2781da327cd2SJung-uk Kim                     lu = s->shared_sigalgs[i];
2782e71b7053SJung-uk Kim 
2783e71b7053SJung-uk Kim                     if (s->server) {
2784e71b7053SJung-uk Kim                         if ((sig_idx = tls12_get_cert_sigalg_idx(s, lu)) == -1)
2785e71b7053SJung-uk Kim                             continue;
2786e71b7053SJung-uk Kim                     } else {
2787e71b7053SJung-uk Kim                         int cc_idx = s->cert->key - s->cert->pkeys;
2788e71b7053SJung-uk Kim 
2789e71b7053SJung-uk Kim                         sig_idx = lu->sig_idx;
2790e71b7053SJung-uk Kim                         if (cc_idx != sig_idx)
2791e71b7053SJung-uk Kim                             continue;
2792e71b7053SJung-uk Kim                     }
2793e71b7053SJung-uk Kim                     /* Check that we have a cert, and sig_algs_cert */
2794e71b7053SJung-uk Kim                     if (!has_usable_cert(s, lu, sig_idx))
2795e71b7053SJung-uk Kim                         continue;
2796e71b7053SJung-uk Kim                     if (lu->sig == EVP_PKEY_RSA_PSS) {
2797e71b7053SJung-uk Kim                         /* validate that key is large enough for the signature algorithm */
2798e71b7053SJung-uk Kim                         EVP_PKEY *pkey = s->cert->pkeys[sig_idx].privatekey;
2799e71b7053SJung-uk Kim 
2800e71b7053SJung-uk Kim                         if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(pkey), lu))
2801e71b7053SJung-uk Kim                             continue;
2802e71b7053SJung-uk Kim                     }
2803e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
2804e71b7053SJung-uk Kim                     if (curve == -1 || lu->curve == curve)
2805e71b7053SJung-uk Kim #endif
2806e71b7053SJung-uk Kim                         break;
2807e71b7053SJung-uk Kim                 }
2808*17f01e99SJung-uk Kim #ifndef OPENSSL_NO_GOST
2809*17f01e99SJung-uk Kim                 /*
2810*17f01e99SJung-uk Kim                  * Some Windows-based implementations do not send GOST algorithms indication
2811*17f01e99SJung-uk Kim                  * in supported_algorithms extension, so when we have GOST-based ciphersuite,
2812*17f01e99SJung-uk Kim                  * we have to assume GOST support.
2813*17f01e99SJung-uk Kim                  */
2814*17f01e99SJung-uk Kim                 if (i == s->shared_sigalgslen && s->s3->tmp.new_cipher->algorithm_auth & (SSL_aGOST01 | SSL_aGOST12)) {
2815*17f01e99SJung-uk Kim                   if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2816*17f01e99SJung-uk Kim                     if (!fatalerrs)
2817*17f01e99SJung-uk Kim                       return 1;
2818*17f01e99SJung-uk Kim                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2819*17f01e99SJung-uk Kim                              SSL_F_TLS_CHOOSE_SIGALG,
2820*17f01e99SJung-uk Kim                              SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2821*17f01e99SJung-uk Kim                     return 0;
2822*17f01e99SJung-uk Kim                   } else {
2823*17f01e99SJung-uk Kim                     i = 0;
2824*17f01e99SJung-uk Kim                     sig_idx = lu->sig_idx;
2825*17f01e99SJung-uk Kim                   }
2826*17f01e99SJung-uk Kim                 }
2827*17f01e99SJung-uk Kim #endif
2828da327cd2SJung-uk Kim                 if (i == s->shared_sigalgslen) {
2829e71b7053SJung-uk Kim                     if (!fatalerrs)
2830e71b7053SJung-uk Kim                         return 1;
2831e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2832e71b7053SJung-uk Kim                              SSL_F_TLS_CHOOSE_SIGALG,
2833e71b7053SJung-uk Kim                              SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2834e71b7053SJung-uk Kim                     return 0;
2835e71b7053SJung-uk Kim                 }
2836e71b7053SJung-uk Kim             } else {
2837e71b7053SJung-uk Kim                 /*
2838e71b7053SJung-uk Kim                  * If we have no sigalg use defaults
2839e71b7053SJung-uk Kim                  */
2840e71b7053SJung-uk Kim                 const uint16_t *sent_sigs;
2841e71b7053SJung-uk Kim                 size_t sent_sigslen;
2842e71b7053SJung-uk Kim 
2843e71b7053SJung-uk Kim                 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2844e71b7053SJung-uk Kim                     if (!fatalerrs)
2845e71b7053SJung-uk Kim                         return 1;
2846e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2847e71b7053SJung-uk Kim                              ERR_R_INTERNAL_ERROR);
2848e71b7053SJung-uk Kim                     return 0;
2849e71b7053SJung-uk Kim                 }
2850e71b7053SJung-uk Kim 
2851e71b7053SJung-uk Kim                 /* Check signature matches a type we sent */
2852e71b7053SJung-uk Kim                 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
2853e71b7053SJung-uk Kim                 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
2854e71b7053SJung-uk Kim                     if (lu->sigalg == *sent_sigs
2855e71b7053SJung-uk Kim                             && has_usable_cert(s, lu, lu->sig_idx))
2856e71b7053SJung-uk Kim                         break;
2857e71b7053SJung-uk Kim                 }
2858e71b7053SJung-uk Kim                 if (i == sent_sigslen) {
2859e71b7053SJung-uk Kim                     if (!fatalerrs)
2860e71b7053SJung-uk Kim                         return 1;
2861e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
2862e71b7053SJung-uk Kim                              SSL_F_TLS_CHOOSE_SIGALG,
2863e71b7053SJung-uk Kim                              SSL_R_WRONG_SIGNATURE_TYPE);
2864e71b7053SJung-uk Kim                     return 0;
2865e71b7053SJung-uk Kim                 }
2866e71b7053SJung-uk Kim             }
2867e71b7053SJung-uk Kim         } else {
2868e71b7053SJung-uk Kim             if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2869e71b7053SJung-uk Kim                 if (!fatalerrs)
2870e71b7053SJung-uk Kim                     return 1;
2871e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2872e71b7053SJung-uk Kim                          ERR_R_INTERNAL_ERROR);
2873e71b7053SJung-uk Kim                 return 0;
2874e71b7053SJung-uk Kim             }
2875e71b7053SJung-uk Kim         }
2876e71b7053SJung-uk Kim     }
2877e71b7053SJung-uk Kim     if (sig_idx == -1)
2878e71b7053SJung-uk Kim         sig_idx = lu->sig_idx;
2879e71b7053SJung-uk Kim     s->s3->tmp.cert = &s->cert->pkeys[sig_idx];
2880e71b7053SJung-uk Kim     s->cert->key = s->s3->tmp.cert;
2881e71b7053SJung-uk Kim     s->s3->tmp.sigalg = lu;
2882e71b7053SJung-uk Kim     return 1;
2883e71b7053SJung-uk Kim }
2884e71b7053SJung-uk Kim 
2885e71b7053SJung-uk Kim int SSL_CTX_set_tlsext_max_fragment_length(SSL_CTX *ctx, uint8_t mode)
2886e71b7053SJung-uk Kim {
2887e71b7053SJung-uk Kim     if (mode != TLSEXT_max_fragment_length_DISABLED
2888e71b7053SJung-uk Kim             && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2889e71b7053SJung-uk Kim         SSLerr(SSL_F_SSL_CTX_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2890e71b7053SJung-uk Kim                SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2891e71b7053SJung-uk Kim         return 0;
2892e71b7053SJung-uk Kim     }
2893e71b7053SJung-uk Kim 
2894e71b7053SJung-uk Kim     ctx->ext.max_fragment_len_mode = mode;
2895e71b7053SJung-uk Kim     return 1;
2896e71b7053SJung-uk Kim }
2897e71b7053SJung-uk Kim 
2898e71b7053SJung-uk Kim int SSL_set_tlsext_max_fragment_length(SSL *ssl, uint8_t mode)
2899e71b7053SJung-uk Kim {
2900e71b7053SJung-uk Kim     if (mode != TLSEXT_max_fragment_length_DISABLED
2901e71b7053SJung-uk Kim             && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2902e71b7053SJung-uk Kim         SSLerr(SSL_F_SSL_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2903e71b7053SJung-uk Kim                SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2904e71b7053SJung-uk Kim         return 0;
2905e71b7053SJung-uk Kim     }
2906e71b7053SJung-uk Kim 
2907e71b7053SJung-uk Kim     ssl->ext.max_fragment_len_mode = mode;
2908e71b7053SJung-uk Kim     return 1;
2909e71b7053SJung-uk Kim }
2910e71b7053SJung-uk Kim 
2911e71b7053SJung-uk Kim uint8_t SSL_SESSION_get_max_fragment_length(const SSL_SESSION *session)
2912e71b7053SJung-uk Kim {
2913e71b7053SJung-uk Kim     return session->ext.max_fragment_len_mode;
2914e71b7053SJung-uk Kim }
2915