xref: /freebsd/crypto/openssl/ssl/t1_lib.c (revision da327cd22e88f26f6cab9d4c45805b512139aa11)
1e71b7053SJung-uk Kim /*
2*da327cd2SJung-uk Kim  * Copyright 1995-2019 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"
2174664626SKris Kennaway #include "ssl_locl.h"
22e71b7053SJung-uk Kim #include <openssl/ct.h>
2374664626SKris Kennaway 
24*da327cd2SJung-uk Kim static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey);
25*da327cd2SJung-uk Kim 
26e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_enc_data = {
2774664626SKris Kennaway     tls1_enc,
2874664626SKris Kennaway     tls1_mac,
2974664626SKris Kennaway     tls1_setup_key_block,
3074664626SKris Kennaway     tls1_generate_master_secret,
3174664626SKris Kennaway     tls1_change_cipher_state,
3274664626SKris Kennaway     tls1_final_finish_mac,
3374664626SKris Kennaway     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
3474664626SKris Kennaway     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
3574664626SKris Kennaway     tls1_alert_code,
361f13597dSJung-uk Kim     tls1_export_keying_material,
377bded2dbSJung-uk Kim     0,
387bded2dbSJung-uk Kim     ssl3_set_handshake_header,
39e71b7053SJung-uk Kim     tls_close_construct_packet,
407bded2dbSJung-uk Kim     ssl3_handshake_write
417bded2dbSJung-uk Kim };
427bded2dbSJung-uk Kim 
43e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_1_enc_data = {
447bded2dbSJung-uk Kim     tls1_enc,
457bded2dbSJung-uk Kim     tls1_mac,
467bded2dbSJung-uk Kim     tls1_setup_key_block,
477bded2dbSJung-uk Kim     tls1_generate_master_secret,
487bded2dbSJung-uk Kim     tls1_change_cipher_state,
497bded2dbSJung-uk Kim     tls1_final_finish_mac,
507bded2dbSJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
517bded2dbSJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
527bded2dbSJung-uk Kim     tls1_alert_code,
537bded2dbSJung-uk Kim     tls1_export_keying_material,
547bded2dbSJung-uk Kim     SSL_ENC_FLAG_EXPLICIT_IV,
557bded2dbSJung-uk Kim     ssl3_set_handshake_header,
56e71b7053SJung-uk Kim     tls_close_construct_packet,
577bded2dbSJung-uk Kim     ssl3_handshake_write
587bded2dbSJung-uk Kim };
597bded2dbSJung-uk Kim 
60e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_2_enc_data = {
617bded2dbSJung-uk Kim     tls1_enc,
627bded2dbSJung-uk Kim     tls1_mac,
637bded2dbSJung-uk Kim     tls1_setup_key_block,
647bded2dbSJung-uk Kim     tls1_generate_master_secret,
657bded2dbSJung-uk Kim     tls1_change_cipher_state,
667bded2dbSJung-uk Kim     tls1_final_finish_mac,
677bded2dbSJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
687bded2dbSJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
697bded2dbSJung-uk Kim     tls1_alert_code,
707bded2dbSJung-uk Kim     tls1_export_keying_material,
717bded2dbSJung-uk Kim     SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
727bded2dbSJung-uk Kim         | SSL_ENC_FLAG_TLS1_2_CIPHERS,
737bded2dbSJung-uk Kim     ssl3_set_handshake_header,
74e71b7053SJung-uk Kim     tls_close_construct_packet,
75e71b7053SJung-uk Kim     ssl3_handshake_write
76e71b7053SJung-uk Kim };
77e71b7053SJung-uk Kim 
78e71b7053SJung-uk Kim SSL3_ENC_METHOD const TLSv1_3_enc_data = {
79e71b7053SJung-uk Kim     tls13_enc,
80e71b7053SJung-uk Kim     tls1_mac,
81e71b7053SJung-uk Kim     tls13_setup_key_block,
82e71b7053SJung-uk Kim     tls13_generate_master_secret,
83e71b7053SJung-uk Kim     tls13_change_cipher_state,
84e71b7053SJung-uk Kim     tls13_final_finish_mac,
85e71b7053SJung-uk Kim     TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
86e71b7053SJung-uk Kim     TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
87e71b7053SJung-uk Kim     tls13_alert_code,
88e71b7053SJung-uk Kim     tls13_export_keying_material,
89e71b7053SJung-uk Kim     SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
90e71b7053SJung-uk Kim     ssl3_set_handshake_header,
91e71b7053SJung-uk Kim     tls_close_construct_packet,
927bded2dbSJung-uk Kim     ssl3_handshake_write
9374664626SKris Kennaway };
9474664626SKris Kennaway 
953b4e3dcbSSimon L. B. Nielsen long tls1_default_timeout(void)
9674664626SKris Kennaway {
976f9291ceSJung-uk Kim     /*
986f9291ceSJung-uk Kim      * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
996f9291ceSJung-uk Kim      * http, the cache would over fill
1006f9291ceSJung-uk Kim      */
10174664626SKris Kennaway     return (60 * 60 * 2);
10274664626SKris Kennaway }
10374664626SKris Kennaway 
10474664626SKris Kennaway int tls1_new(SSL *s)
10574664626SKris Kennaway {
1066f9291ceSJung-uk Kim     if (!ssl3_new(s))
107e71b7053SJung-uk Kim         return 0;
108e71b7053SJung-uk Kim     if (!s->method->ssl_clear(s))
109e71b7053SJung-uk Kim         return 0;
110e71b7053SJung-uk Kim 
111e71b7053SJung-uk Kim     return 1;
11274664626SKris Kennaway }
11374664626SKris Kennaway 
11474664626SKris Kennaway void tls1_free(SSL *s)
11574664626SKris Kennaway {
116e71b7053SJung-uk Kim     OPENSSL_free(s->ext.session_ticket);
11774664626SKris Kennaway     ssl3_free(s);
11874664626SKris Kennaway }
11974664626SKris Kennaway 
120e71b7053SJung-uk Kim int tls1_clear(SSL *s)
12174664626SKris Kennaway {
122e71b7053SJung-uk Kim     if (!ssl3_clear(s))
123e71b7053SJung-uk Kim         return 0;
124e71b7053SJung-uk Kim 
125e71b7053SJung-uk Kim     if (s->method->version == TLS_ANY_VERSION)
126e71b7053SJung-uk Kim         s->version = TLS_MAX_VERSION;
127e71b7053SJung-uk Kim     else
1281f13597dSJung-uk Kim         s->version = s->method->version;
129e71b7053SJung-uk Kim 
130e71b7053SJung-uk Kim     return 1;
13174664626SKris Kennaway }
13274664626SKris Kennaway 
1331f13597dSJung-uk Kim #ifndef OPENSSL_NO_EC
1341f13597dSJung-uk Kim 
135e71b7053SJung-uk Kim /*
136e71b7053SJung-uk Kim  * Table of curve information.
137e71b7053SJung-uk Kim  * Do not delete entries or reorder this array! It is used as a lookup
138e71b7053SJung-uk Kim  * table: the index of each entry is one less than the TLS curve id.
139e71b7053SJung-uk Kim  */
140e71b7053SJung-uk Kim static const TLS_GROUP_INFO nid_list[] = {
141e71b7053SJung-uk Kim     {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
142e71b7053SJung-uk Kim     {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
143e71b7053SJung-uk Kim     {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
144e71b7053SJung-uk Kim     {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
145e71b7053SJung-uk Kim     {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
146e71b7053SJung-uk Kim     {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
147e71b7053SJung-uk Kim     {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
148e71b7053SJung-uk Kim     {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
149e71b7053SJung-uk Kim     {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
150e71b7053SJung-uk Kim     {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
151e71b7053SJung-uk Kim     {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
152e71b7053SJung-uk Kim     {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
153e71b7053SJung-uk Kim     {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
154e71b7053SJung-uk Kim     {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
155e71b7053SJung-uk Kim     {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
156e71b7053SJung-uk Kim     {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
157e71b7053SJung-uk Kim     {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
158e71b7053SJung-uk Kim     {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
159e71b7053SJung-uk Kim     {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
160e71b7053SJung-uk Kim     {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
161e71b7053SJung-uk Kim     {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
162e71b7053SJung-uk Kim     {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
163e71b7053SJung-uk Kim     {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
164e71b7053SJung-uk Kim     {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
165e71b7053SJung-uk Kim     {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
166e71b7053SJung-uk Kim     {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
167e71b7053SJung-uk Kim     {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
168e71b7053SJung-uk Kim     {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
169e71b7053SJung-uk Kim     {EVP_PKEY_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
170e71b7053SJung-uk Kim     {EVP_PKEY_X448, 224, TLS_CURVE_CUSTOM}, /* X448 (30) */
1711f13597dSJung-uk Kim };
1721f13597dSJung-uk Kim 
1737bded2dbSJung-uk Kim static const unsigned char ecformats_default[] = {
1747bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_uncompressed,
1757bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
1767bded2dbSJung-uk Kim     TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
1771f13597dSJung-uk Kim };
1781f13597dSJung-uk Kim 
179e71b7053SJung-uk Kim /* The default curves */
180e71b7053SJung-uk Kim static const uint16_t eccurves_default[] = {
181e71b7053SJung-uk Kim     29,                      /* X25519 (29) */
182e71b7053SJung-uk Kim     23,                      /* secp256r1 (23) */
183e71b7053SJung-uk Kim     30,                      /* X448 (30) */
184e71b7053SJung-uk Kim     25,                      /* secp521r1 (25) */
185e71b7053SJung-uk Kim     24,                      /* secp384r1 (24) */
1867bded2dbSJung-uk Kim };
1877bded2dbSJung-uk Kim 
188e71b7053SJung-uk Kim static const uint16_t suiteb_curves[] = {
189e71b7053SJung-uk Kim     TLSEXT_curve_P_256,
190e71b7053SJung-uk Kim     TLSEXT_curve_P_384
1917bded2dbSJung-uk Kim };
1927bded2dbSJung-uk Kim 
193e71b7053SJung-uk Kim const TLS_GROUP_INFO *tls1_group_id_lookup(uint16_t group_id)
1941f13597dSJung-uk Kim {
1957bded2dbSJung-uk Kim     /* ECC curves from RFC 4492 and RFC 7027 */
196e71b7053SJung-uk Kim     if (group_id < 1 || group_id > OSSL_NELEM(nid_list))
197e71b7053SJung-uk Kim         return NULL;
198e71b7053SJung-uk Kim     return &nid_list[group_id - 1];
19974664626SKris Kennaway }
200f579bf8eSKris Kennaway 
201e71b7053SJung-uk Kim static uint16_t tls1_nid2group_id(int nid)
202f579bf8eSKris Kennaway {
203e71b7053SJung-uk Kim     size_t i;
204e71b7053SJung-uk Kim     for (i = 0; i < OSSL_NELEM(nid_list); i++) {
205e71b7053SJung-uk Kim         if (nid_list[i].nid == nid)
206e71b7053SJung-uk Kim             return (uint16_t)(i + 1);
207f579bf8eSKris Kennaway     }
208e71b7053SJung-uk Kim     return 0;
2091f13597dSJung-uk Kim }
2107bded2dbSJung-uk Kim 
2117bded2dbSJung-uk Kim /*
212e71b7053SJung-uk Kim  * Set *pgroups to the supported groups list and *pgroupslen to
213e71b7053SJung-uk Kim  * the number of groups supported.
2147bded2dbSJung-uk Kim  */
215e71b7053SJung-uk Kim void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
216e71b7053SJung-uk Kim                                size_t *pgroupslen)
2177bded2dbSJung-uk Kim {
218e71b7053SJung-uk Kim 
2197bded2dbSJung-uk Kim     /* For Suite B mode only include P-256, P-384 */
2207bded2dbSJung-uk Kim     switch (tls1_suiteb(s)) {
2217bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS:
222e71b7053SJung-uk Kim         *pgroups = suiteb_curves;
223e71b7053SJung-uk Kim         *pgroupslen = OSSL_NELEM(suiteb_curves);
2247bded2dbSJung-uk Kim         break;
2257bded2dbSJung-uk Kim 
2267bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
227e71b7053SJung-uk Kim         *pgroups = suiteb_curves;
228e71b7053SJung-uk Kim         *pgroupslen = 1;
2297bded2dbSJung-uk Kim         break;
2307bded2dbSJung-uk Kim 
2317bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_192_LOS:
232e71b7053SJung-uk Kim         *pgroups = suiteb_curves + 1;
233e71b7053SJung-uk Kim         *pgroupslen = 1;
2347bded2dbSJung-uk Kim         break;
235e71b7053SJung-uk Kim 
2367bded2dbSJung-uk Kim     default:
237e71b7053SJung-uk Kim         if (s->ext.supportedgroups == NULL) {
238e71b7053SJung-uk Kim             *pgroups = eccurves_default;
239e71b7053SJung-uk Kim             *pgroupslen = OSSL_NELEM(eccurves_default);
2407bded2dbSJung-uk Kim         } else {
241e71b7053SJung-uk Kim             *pgroups = s->ext.supportedgroups;
242e71b7053SJung-uk Kim             *pgroupslen = s->ext.supportedgroups_len;
2437bded2dbSJung-uk Kim         }
244e71b7053SJung-uk Kim         break;
2457bded2dbSJung-uk Kim     }
2467bded2dbSJung-uk Kim }
2477bded2dbSJung-uk Kim 
248e71b7053SJung-uk Kim /* See if curve is allowed by security callback */
249e71b7053SJung-uk Kim int tls_curve_allowed(SSL *s, uint16_t curve, int op)
2507bded2dbSJung-uk Kim {
251e71b7053SJung-uk Kim     const TLS_GROUP_INFO *cinfo = tls1_group_id_lookup(curve);
252e71b7053SJung-uk Kim     unsigned char ctmp[2];
253e71b7053SJung-uk Kim 
254e71b7053SJung-uk Kim     if (cinfo == NULL)
2557bded2dbSJung-uk Kim         return 0;
256e71b7053SJung-uk Kim # ifdef OPENSSL_NO_EC2M
257e71b7053SJung-uk Kim     if (cinfo->flags & TLS_CURVE_CHAR2)
2587bded2dbSJung-uk Kim         return 0;
259e71b7053SJung-uk Kim # endif
260e71b7053SJung-uk Kim     ctmp[0] = curve >> 8;
261e71b7053SJung-uk Kim     ctmp[1] = curve & 0xff;
262e71b7053SJung-uk Kim     return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)ctmp);
2637bded2dbSJung-uk Kim }
264e71b7053SJung-uk Kim 
265e71b7053SJung-uk Kim /* Return 1 if "id" is in "list" */
266e71b7053SJung-uk Kim static int tls1_in_list(uint16_t id, const uint16_t *list, size_t listlen)
267e71b7053SJung-uk Kim {
268e71b7053SJung-uk Kim     size_t i;
269e71b7053SJung-uk Kim     for (i = 0; i < listlen; i++)
270e71b7053SJung-uk Kim         if (list[i] == id)
2717bded2dbSJung-uk Kim             return 1;
2727bded2dbSJung-uk Kim     return 0;
2737bded2dbSJung-uk Kim }
2747bded2dbSJung-uk Kim 
2757bded2dbSJung-uk Kim /*-
276e71b7053SJung-uk Kim  * For nmatch >= 0, return the id of the |nmatch|th shared group or 0
277e71b7053SJung-uk Kim  * if there is no match.
2787bded2dbSJung-uk Kim  * For nmatch == -1, return number of matches
279e71b7053SJung-uk Kim  * For nmatch == -2, return the id of the group to use for
280e71b7053SJung-uk Kim  * a tmp key, or 0 if there is no match.
2817bded2dbSJung-uk Kim  */
282e71b7053SJung-uk Kim uint16_t tls1_shared_group(SSL *s, int nmatch)
2837bded2dbSJung-uk Kim {
284e71b7053SJung-uk Kim     const uint16_t *pref, *supp;
285e71b7053SJung-uk Kim     size_t num_pref, num_supp, i;
2867bded2dbSJung-uk Kim     int k;
287e71b7053SJung-uk Kim 
2887bded2dbSJung-uk Kim     /* Can't do anything on client side */
2897bded2dbSJung-uk Kim     if (s->server == 0)
290e71b7053SJung-uk Kim         return 0;
2917bded2dbSJung-uk Kim     if (nmatch == -2) {
2927bded2dbSJung-uk Kim         if (tls1_suiteb(s)) {
2937bded2dbSJung-uk Kim             /*
2947bded2dbSJung-uk Kim              * For Suite B ciphersuite determines curve: we already know
2957bded2dbSJung-uk Kim              * these are acceptable due to previous checks.
2967bded2dbSJung-uk Kim              */
2977bded2dbSJung-uk Kim             unsigned long cid = s->s3->tmp.new_cipher->id;
298e71b7053SJung-uk Kim 
2997bded2dbSJung-uk Kim             if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
300e71b7053SJung-uk Kim                 return TLSEXT_curve_P_256;
3017bded2dbSJung-uk Kim             if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
302e71b7053SJung-uk Kim                 return TLSEXT_curve_P_384;
3037bded2dbSJung-uk Kim             /* Should never happen */
304e71b7053SJung-uk Kim             return 0;
3057bded2dbSJung-uk Kim         }
3067bded2dbSJung-uk Kim         /* If not Suite B just return first preference shared curve */
3077bded2dbSJung-uk Kim         nmatch = 0;
3087bded2dbSJung-uk Kim     }
3097bded2dbSJung-uk Kim     /*
310e71b7053SJung-uk Kim      * If server preference set, our groups are the preference order
311e71b7053SJung-uk Kim      * otherwise peer decides.
3127bded2dbSJung-uk Kim      */
313e71b7053SJung-uk Kim     if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
314e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &pref, &num_pref);
315e71b7053SJung-uk Kim         tls1_get_peer_groups(s, &supp, &num_supp);
316e71b7053SJung-uk Kim     } else {
317e71b7053SJung-uk Kim         tls1_get_peer_groups(s, &pref, &num_pref);
318e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &supp, &num_supp);
3197bded2dbSJung-uk Kim     }
3207bded2dbSJung-uk Kim 
321e71b7053SJung-uk Kim     for (k = 0, i = 0; i < num_pref; i++) {
322e71b7053SJung-uk Kim         uint16_t id = pref[i];
323e71b7053SJung-uk Kim 
324e71b7053SJung-uk Kim         if (!tls1_in_list(id, supp, num_supp)
325e71b7053SJung-uk Kim             || !tls_curve_allowed(s, id, SSL_SECOP_CURVE_SHARED))
326e71b7053SJung-uk Kim                     continue;
327e71b7053SJung-uk Kim         if (nmatch == k)
328e71b7053SJung-uk Kim             return id;
3297bded2dbSJung-uk Kim          k++;
3307bded2dbSJung-uk Kim     }
3317bded2dbSJung-uk Kim     if (nmatch == -1)
3327bded2dbSJung-uk Kim         return k;
3337bded2dbSJung-uk Kim     /* Out of range (nmatch > k). */
334e71b7053SJung-uk Kim     return 0;
3357bded2dbSJung-uk Kim }
3367bded2dbSJung-uk Kim 
337e71b7053SJung-uk Kim int tls1_set_groups(uint16_t **pext, size_t *pextlen,
338e71b7053SJung-uk Kim                     int *groups, size_t ngroups)
3397bded2dbSJung-uk Kim {
340e71b7053SJung-uk Kim     uint16_t *glist;
3417bded2dbSJung-uk Kim     size_t i;
3427bded2dbSJung-uk Kim     /*
343e71b7053SJung-uk Kim      * Bitmap of groups included to detect duplicates: only works while group
3447bded2dbSJung-uk Kim      * ids < 32
3457bded2dbSJung-uk Kim      */
3467bded2dbSJung-uk Kim     unsigned long dup_list = 0;
3477bded2dbSJung-uk Kim 
348c9cf7b5cSJung-uk Kim     if (ngroups == 0) {
349c9cf7b5cSJung-uk Kim         SSLerr(SSL_F_TLS1_SET_GROUPS, SSL_R_BAD_LENGTH);
350c9cf7b5cSJung-uk Kim         return 0;
351c9cf7b5cSJung-uk Kim     }
352e71b7053SJung-uk Kim     if ((glist = OPENSSL_malloc(ngroups * sizeof(*glist))) == NULL) {
353e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_GROUPS, ERR_R_MALLOC_FAILURE);
3547bded2dbSJung-uk Kim         return 0;
3557bded2dbSJung-uk Kim     }
356e71b7053SJung-uk Kim     for (i = 0; i < ngroups; i++) {
357e71b7053SJung-uk Kim         unsigned long idmask;
358e71b7053SJung-uk Kim         uint16_t id;
359e71b7053SJung-uk Kim         /* TODO(TLS1.3): Convert for DH groups */
360e71b7053SJung-uk Kim         id = tls1_nid2group_id(groups[i]);
3617bded2dbSJung-uk Kim         idmask = 1L << id;
3627bded2dbSJung-uk Kim         if (!id || (dup_list & idmask)) {
363e71b7053SJung-uk Kim             OPENSSL_free(glist);
3647bded2dbSJung-uk Kim             return 0;
3657bded2dbSJung-uk Kim         }
3667bded2dbSJung-uk Kim         dup_list |= idmask;
367e71b7053SJung-uk Kim         glist[i] = id;
3687bded2dbSJung-uk Kim     }
3697bded2dbSJung-uk Kim     OPENSSL_free(*pext);
370e71b7053SJung-uk Kim     *pext = glist;
371e71b7053SJung-uk Kim     *pextlen = ngroups;
3727bded2dbSJung-uk Kim     return 1;
3737bded2dbSJung-uk Kim }
3747bded2dbSJung-uk Kim 
375e71b7053SJung-uk Kim # define MAX_CURVELIST   OSSL_NELEM(nid_list)
3767bded2dbSJung-uk Kim 
3777bded2dbSJung-uk Kim typedef struct {
3787bded2dbSJung-uk Kim     size_t nidcnt;
3797bded2dbSJung-uk Kim     int nid_arr[MAX_CURVELIST];
3807bded2dbSJung-uk Kim } nid_cb_st;
3817bded2dbSJung-uk Kim 
3827bded2dbSJung-uk Kim static int nid_cb(const char *elem, int len, void *arg)
3837bded2dbSJung-uk Kim {
3847bded2dbSJung-uk Kim     nid_cb_st *narg = arg;
3857bded2dbSJung-uk Kim     size_t i;
3867bded2dbSJung-uk Kim     int nid;
3877bded2dbSJung-uk Kim     char etmp[20];
3887bded2dbSJung-uk Kim     if (elem == NULL)
3897bded2dbSJung-uk Kim         return 0;
3907bded2dbSJung-uk Kim     if (narg->nidcnt == MAX_CURVELIST)
3917bded2dbSJung-uk Kim         return 0;
3927bded2dbSJung-uk Kim     if (len > (int)(sizeof(etmp) - 1))
3937bded2dbSJung-uk Kim         return 0;
3947bded2dbSJung-uk Kim     memcpy(etmp, elem, len);
3957bded2dbSJung-uk Kim     etmp[len] = 0;
3967bded2dbSJung-uk Kim     nid = EC_curve_nist2nid(etmp);
3977bded2dbSJung-uk Kim     if (nid == NID_undef)
3987bded2dbSJung-uk Kim         nid = OBJ_sn2nid(etmp);
3997bded2dbSJung-uk Kim     if (nid == NID_undef)
4007bded2dbSJung-uk Kim         nid = OBJ_ln2nid(etmp);
4017bded2dbSJung-uk Kim     if (nid == NID_undef)
4027bded2dbSJung-uk Kim         return 0;
4037bded2dbSJung-uk Kim     for (i = 0; i < narg->nidcnt; i++)
4047bded2dbSJung-uk Kim         if (narg->nid_arr[i] == nid)
4057bded2dbSJung-uk Kim             return 0;
4067bded2dbSJung-uk Kim     narg->nid_arr[narg->nidcnt++] = nid;
4077bded2dbSJung-uk Kim     return 1;
4087bded2dbSJung-uk Kim }
4097bded2dbSJung-uk Kim 
410e71b7053SJung-uk Kim /* Set groups based on a colon separate list */
411e71b7053SJung-uk Kim int tls1_set_groups_list(uint16_t **pext, size_t *pextlen, const char *str)
4127bded2dbSJung-uk Kim {
4137bded2dbSJung-uk Kim     nid_cb_st ncb;
4147bded2dbSJung-uk Kim     ncb.nidcnt = 0;
4157bded2dbSJung-uk Kim     if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
4167bded2dbSJung-uk Kim         return 0;
4177bded2dbSJung-uk Kim     if (pext == NULL)
4187bded2dbSJung-uk Kim         return 1;
419e71b7053SJung-uk Kim     return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
4207bded2dbSJung-uk Kim }
421e71b7053SJung-uk Kim /* Return group id of a key */
422e71b7053SJung-uk Kim static uint16_t tls1_get_group_id(EVP_PKEY *pkey)
4237bded2dbSJung-uk Kim {
424e71b7053SJung-uk Kim     EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
4257bded2dbSJung-uk Kim     const EC_GROUP *grp;
426e71b7053SJung-uk Kim 
427e71b7053SJung-uk Kim     if (ec == NULL)
4287bded2dbSJung-uk Kim         return 0;
4297bded2dbSJung-uk Kim     grp = EC_KEY_get0_group(ec);
430e71b7053SJung-uk Kim     return tls1_nid2group_id(EC_GROUP_get_curve_name(grp));
4317bded2dbSJung-uk Kim }
4327bded2dbSJung-uk Kim 
433e71b7053SJung-uk Kim /* Check a key is compatible with compression extension */
434e71b7053SJung-uk Kim static int tls1_check_pkey_comp(SSL *s, EVP_PKEY *pkey)
4357bded2dbSJung-uk Kim {
436e71b7053SJung-uk Kim     const EC_KEY *ec;
437e71b7053SJung-uk Kim     const EC_GROUP *grp;
438e71b7053SJung-uk Kim     unsigned char comp_id;
439e71b7053SJung-uk Kim     size_t i;
440e71b7053SJung-uk Kim 
441e71b7053SJung-uk Kim     /* If not an EC key nothing to check */
442e71b7053SJung-uk Kim     if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
443e71b7053SJung-uk Kim         return 1;
444e71b7053SJung-uk Kim     ec = EVP_PKEY_get0_EC_KEY(pkey);
445e71b7053SJung-uk Kim     grp = EC_KEY_get0_group(ec);
446e71b7053SJung-uk Kim 
447e71b7053SJung-uk Kim     /* Get required compression id */
448e71b7053SJung-uk Kim     if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
449e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
450e71b7053SJung-uk Kim     } else if (SSL_IS_TLS13(s)) {
451e71b7053SJung-uk Kim             /*
452e71b7053SJung-uk Kim              * ec_point_formats extension is not used in TLSv1.3 so we ignore
453e71b7053SJung-uk Kim              * this check.
454e71b7053SJung-uk Kim              */
455e71b7053SJung-uk Kim             return 1;
456e71b7053SJung-uk Kim     } else {
457e71b7053SJung-uk Kim         int field_type = EC_METHOD_get_field_type(EC_GROUP_method_of(grp));
458e71b7053SJung-uk Kim 
459e71b7053SJung-uk Kim         if (field_type == NID_X9_62_prime_field)
460e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
461e71b7053SJung-uk Kim         else if (field_type == NID_X9_62_characteristic_two_field)
462e71b7053SJung-uk Kim             comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
463e71b7053SJung-uk Kim         else
464e71b7053SJung-uk Kim             return 0;
465e71b7053SJung-uk Kim     }
4667bded2dbSJung-uk Kim     /*
4677bded2dbSJung-uk Kim      * If point formats extension present check it, otherwise everything is
4687bded2dbSJung-uk Kim      * supported (see RFC4492).
4697bded2dbSJung-uk Kim      */
470*da327cd2SJung-uk Kim     if (s->ext.peer_ecpointformats == NULL)
4717bded2dbSJung-uk Kim         return 1;
472e71b7053SJung-uk Kim 
473*da327cd2SJung-uk Kim     for (i = 0; i < s->ext.peer_ecpointformats_len; i++) {
474*da327cd2SJung-uk Kim         if (s->ext.peer_ecpointformats[i] == comp_id)
4757bded2dbSJung-uk Kim             return 1;
4767bded2dbSJung-uk Kim     }
477e71b7053SJung-uk Kim     return 0;
4787bded2dbSJung-uk Kim }
4797bded2dbSJung-uk Kim 
480e71b7053SJung-uk Kim /* Check a group id matches preferences */
481e71b7053SJung-uk Kim int tls1_check_group_id(SSL *s, uint16_t group_id, int check_own_groups)
482e71b7053SJung-uk Kim     {
483e71b7053SJung-uk Kim     const uint16_t *groups;
484e71b7053SJung-uk Kim     size_t groups_len;
485e71b7053SJung-uk Kim 
486e71b7053SJung-uk Kim     if (group_id == 0)
487e71b7053SJung-uk Kim         return 0;
488e71b7053SJung-uk Kim 
489e71b7053SJung-uk Kim     /* Check for Suite B compliance */
490e71b7053SJung-uk Kim     if (tls1_suiteb(s) && s->s3->tmp.new_cipher != NULL) {
491e71b7053SJung-uk Kim         unsigned long cid = s->s3->tmp.new_cipher->id;
492e71b7053SJung-uk Kim 
493e71b7053SJung-uk Kim         if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
494e71b7053SJung-uk Kim             if (group_id != TLSEXT_curve_P_256)
495e71b7053SJung-uk Kim                 return 0;
496e71b7053SJung-uk Kim         } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
497e71b7053SJung-uk Kim             if (group_id != TLSEXT_curve_P_384)
498e71b7053SJung-uk Kim                 return 0;
499e71b7053SJung-uk Kim         } else {
500e71b7053SJung-uk Kim             /* Should never happen */
501e71b7053SJung-uk Kim             return 0;
502e71b7053SJung-uk Kim         }
503e71b7053SJung-uk Kim     }
504e71b7053SJung-uk Kim 
505e71b7053SJung-uk Kim     if (check_own_groups) {
506e71b7053SJung-uk Kim         /* Check group is one of our preferences */
507e71b7053SJung-uk Kim         tls1_get_supported_groups(s, &groups, &groups_len);
508e71b7053SJung-uk Kim         if (!tls1_in_list(group_id, groups, groups_len))
509e71b7053SJung-uk Kim             return 0;
510e71b7053SJung-uk Kim     }
511e71b7053SJung-uk Kim 
512e71b7053SJung-uk Kim     if (!tls_curve_allowed(s, group_id, SSL_SECOP_CURVE_CHECK))
513e71b7053SJung-uk Kim         return 0;
514e71b7053SJung-uk Kim 
515e71b7053SJung-uk Kim     /* For clients, nothing more to check */
516e71b7053SJung-uk Kim     if (!s->server)
517e71b7053SJung-uk Kim         return 1;
518e71b7053SJung-uk Kim 
519e71b7053SJung-uk Kim     /* Check group is one of peers preferences */
520e71b7053SJung-uk Kim     tls1_get_peer_groups(s, &groups, &groups_len);
521e71b7053SJung-uk Kim 
522e71b7053SJung-uk Kim     /*
523e71b7053SJung-uk Kim      * RFC 4492 does not require the supported elliptic curves extension
524e71b7053SJung-uk Kim      * so if it is not sent we can just choose any curve.
525e71b7053SJung-uk Kim      * It is invalid to send an empty list in the supported groups
526e71b7053SJung-uk Kim      * extension, so groups_len == 0 always means no extension.
527e71b7053SJung-uk Kim      */
528e71b7053SJung-uk Kim     if (groups_len == 0)
529e71b7053SJung-uk Kim             return 1;
530e71b7053SJung-uk Kim     return tls1_in_list(group_id, groups, groups_len);
531e71b7053SJung-uk Kim }
532e71b7053SJung-uk Kim 
533e71b7053SJung-uk Kim void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
5347bded2dbSJung-uk Kim                          size_t *num_formats)
5357bded2dbSJung-uk Kim {
5367bded2dbSJung-uk Kim     /*
5377bded2dbSJung-uk Kim      * If we have a custom point format list use it otherwise use default
5387bded2dbSJung-uk Kim      */
539e71b7053SJung-uk Kim     if (s->ext.ecpointformats) {
540e71b7053SJung-uk Kim         *pformats = s->ext.ecpointformats;
541e71b7053SJung-uk Kim         *num_formats = s->ext.ecpointformats_len;
5427bded2dbSJung-uk Kim     } else {
5437bded2dbSJung-uk Kim         *pformats = ecformats_default;
5447bded2dbSJung-uk Kim         /* For Suite B we don't support char2 fields */
5457bded2dbSJung-uk Kim         if (tls1_suiteb(s))
5467bded2dbSJung-uk Kim             *num_formats = sizeof(ecformats_default) - 1;
5477bded2dbSJung-uk Kim         else
5487bded2dbSJung-uk Kim             *num_formats = sizeof(ecformats_default);
5497bded2dbSJung-uk Kim     }
5507bded2dbSJung-uk Kim }
5517bded2dbSJung-uk Kim 
5527bded2dbSJung-uk Kim /*
5537bded2dbSJung-uk Kim  * Check cert parameters compatible with extensions: currently just checks EC
5547bded2dbSJung-uk Kim  * certificates have compatible curves and compression.
5557bded2dbSJung-uk Kim  */
556e71b7053SJung-uk Kim static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
5577bded2dbSJung-uk Kim {
558e71b7053SJung-uk Kim     uint16_t group_id;
5597bded2dbSJung-uk Kim     EVP_PKEY *pkey;
560e71b7053SJung-uk Kim     pkey = X509_get0_pubkey(x);
561e71b7053SJung-uk Kim     if (pkey == NULL)
5627bded2dbSJung-uk Kim         return 0;
5637bded2dbSJung-uk Kim     /* If not EC nothing to do */
564e71b7053SJung-uk Kim     if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
5657bded2dbSJung-uk Kim         return 1;
566e71b7053SJung-uk Kim     /* Check compression */
567e71b7053SJung-uk Kim     if (!tls1_check_pkey_comp(s, pkey))
5687bded2dbSJung-uk Kim         return 0;
569e71b7053SJung-uk Kim     group_id = tls1_get_group_id(pkey);
5707bded2dbSJung-uk Kim     /*
571e71b7053SJung-uk Kim      * For a server we allow the certificate to not be in our list of supported
572e71b7053SJung-uk Kim      * groups.
5737bded2dbSJung-uk Kim      */
574e71b7053SJung-uk Kim     if (!tls1_check_group_id(s, group_id, !s->server))
5757bded2dbSJung-uk Kim         return 0;
5767bded2dbSJung-uk Kim     /*
5777bded2dbSJung-uk Kim      * Special case for suite B. We *MUST* sign using SHA256+P-256 or
578e71b7053SJung-uk Kim      * SHA384+P-384.
5797bded2dbSJung-uk Kim      */
580e71b7053SJung-uk Kim     if (check_ee_md && tls1_suiteb(s)) {
5817bded2dbSJung-uk Kim         int check_md;
5827bded2dbSJung-uk Kim         size_t i;
583e71b7053SJung-uk Kim 
5847bded2dbSJung-uk Kim         /* Check to see we have necessary signing algorithm */
585e71b7053SJung-uk Kim         if (group_id == TLSEXT_curve_P_256)
5867bded2dbSJung-uk Kim             check_md = NID_ecdsa_with_SHA256;
587e71b7053SJung-uk Kim         else if (group_id == TLSEXT_curve_P_384)
5887bded2dbSJung-uk Kim             check_md = NID_ecdsa_with_SHA384;
5897bded2dbSJung-uk Kim         else
5907bded2dbSJung-uk Kim             return 0;           /* Should never happen */
591*da327cd2SJung-uk Kim         for (i = 0; i < s->shared_sigalgslen; i++) {
592*da327cd2SJung-uk Kim             if (check_md == s->shared_sigalgs[i]->sigandhash)
593e71b7053SJung-uk Kim                 return 1;;
594e71b7053SJung-uk Kim         }
5957bded2dbSJung-uk Kim         return 0;
5967bded2dbSJung-uk Kim     }
597e71b7053SJung-uk Kim     return 1;
5987bded2dbSJung-uk Kim }
5997bded2dbSJung-uk Kim 
600e71b7053SJung-uk Kim /*
601e71b7053SJung-uk Kim  * tls1_check_ec_tmp_key - Check EC temporary key compatibility
602e71b7053SJung-uk Kim  * @s: SSL connection
603e71b7053SJung-uk Kim  * @cid: Cipher ID we're considering using
604e71b7053SJung-uk Kim  *
605e71b7053SJung-uk Kim  * Checks that the kECDHE cipher suite we're considering using
606e71b7053SJung-uk Kim  * is compatible with the client extensions.
607e71b7053SJung-uk Kim  *
608e71b7053SJung-uk Kim  * Returns 0 when the cipher can't be used or 1 when it can.
609e71b7053SJung-uk Kim  */
6107bded2dbSJung-uk Kim int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
6117bded2dbSJung-uk Kim {
612e71b7053SJung-uk Kim     /* If not Suite B just need a shared group */
613e71b7053SJung-uk Kim     if (!tls1_suiteb(s))
614e71b7053SJung-uk Kim         return tls1_shared_group(s, 0) != 0;
6157bded2dbSJung-uk Kim     /*
6167bded2dbSJung-uk Kim      * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
6177bded2dbSJung-uk Kim      * curves permitted.
6187bded2dbSJung-uk Kim      */
6197bded2dbSJung-uk Kim     if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
620e71b7053SJung-uk Kim         return tls1_check_group_id(s, TLSEXT_curve_P_256, 1);
621e71b7053SJung-uk Kim     if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
622e71b7053SJung-uk Kim         return tls1_check_group_id(s, TLSEXT_curve_P_384, 1);
6237bded2dbSJung-uk Kim 
6247bded2dbSJung-uk Kim     return 0;
6257bded2dbSJung-uk Kim }
6267bded2dbSJung-uk Kim 
6277bded2dbSJung-uk Kim #else
6287bded2dbSJung-uk Kim 
6297bded2dbSJung-uk Kim static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
6307bded2dbSJung-uk Kim {
6317bded2dbSJung-uk Kim     return 1;
6327bded2dbSJung-uk Kim }
6337bded2dbSJung-uk Kim 
6341f13597dSJung-uk Kim #endif                          /* OPENSSL_NO_EC */
635db522d3aSSimon L. B. Nielsen 
636e71b7053SJung-uk Kim /* Default sigalg schemes */
637e71b7053SJung-uk Kim static const uint16_t tls12_sigalgs[] = {
638e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
639e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
640e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
641e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
642e71b7053SJung-uk Kim     TLSEXT_SIGALG_ed25519,
643e71b7053SJung-uk Kim     TLSEXT_SIGALG_ed448,
644e71b7053SJung-uk Kim #endif
645e71b7053SJung-uk Kim 
646e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha256,
647e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha384,
648e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_pss_sha512,
649e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha256,
650e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha384,
651e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pss_rsae_sha512,
652e71b7053SJung-uk Kim 
653e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha256,
654e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha384,
655e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha512,
656e71b7053SJung-uk Kim 
657e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
658e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha224,
659e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha1,
660e71b7053SJung-uk Kim #endif
661e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha224,
662e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha1,
663e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DSA
664e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha224,
665e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha1,
666e71b7053SJung-uk Kim 
667e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha256,
668e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha384,
669e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha512,
670e71b7053SJung-uk Kim #endif
671e71b7053SJung-uk Kim #ifndef OPENSSL_NO_GOST
672e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
673e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
674e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102001_gostr3411,
675e71b7053SJung-uk Kim #endif
676e71b7053SJung-uk Kim };
677e71b7053SJung-uk Kim 
678e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
679e71b7053SJung-uk Kim static const uint16_t suiteb_sigalgs[] = {
680e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
681e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_secp384r1_sha384
682e71b7053SJung-uk Kim };
683e71b7053SJung-uk Kim #endif
684e71b7053SJung-uk Kim 
685e71b7053SJung-uk Kim static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
686e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
687e71b7053SJung-uk Kim     {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
688e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
689e71b7053SJung-uk Kim      NID_ecdsa_with_SHA256, NID_X9_62_prime256v1},
690e71b7053SJung-uk Kim     {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
691e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
692e71b7053SJung-uk Kim      NID_ecdsa_with_SHA384, NID_secp384r1},
693e71b7053SJung-uk Kim     {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
694e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
695e71b7053SJung-uk Kim      NID_ecdsa_with_SHA512, NID_secp521r1},
696e71b7053SJung-uk Kim     {"ed25519", TLSEXT_SIGALG_ed25519,
697e71b7053SJung-uk Kim      NID_undef, -1, EVP_PKEY_ED25519, SSL_PKEY_ED25519,
698e71b7053SJung-uk Kim      NID_undef, NID_undef},
699e71b7053SJung-uk Kim     {"ed448", TLSEXT_SIGALG_ed448,
700e71b7053SJung-uk Kim      NID_undef, -1, EVP_PKEY_ED448, SSL_PKEY_ED448,
701e71b7053SJung-uk Kim      NID_undef, NID_undef},
702e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_ecdsa_sha224,
703e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
704e71b7053SJung-uk Kim      NID_ecdsa_with_SHA224, NID_undef},
705e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_ecdsa_sha1,
706e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
707e71b7053SJung-uk Kim      NID_ecdsa_with_SHA1, NID_undef},
708e71b7053SJung-uk Kim #endif
709e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha256", TLSEXT_SIGALG_rsa_pss_rsae_sha256,
710e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
711e71b7053SJung-uk Kim      NID_undef, NID_undef},
712e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha384", TLSEXT_SIGALG_rsa_pss_rsae_sha384,
713e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
714e71b7053SJung-uk Kim      NID_undef, NID_undef},
715e71b7053SJung-uk Kim     {"rsa_pss_rsae_sha512", TLSEXT_SIGALG_rsa_pss_rsae_sha512,
716e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
717e71b7053SJung-uk Kim      NID_undef, NID_undef},
718e71b7053SJung-uk Kim     {"rsa_pss_pss_sha256", TLSEXT_SIGALG_rsa_pss_pss_sha256,
719e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
720e71b7053SJung-uk Kim      NID_undef, NID_undef},
721e71b7053SJung-uk Kim     {"rsa_pss_pss_sha384", TLSEXT_SIGALG_rsa_pss_pss_sha384,
722e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
723e71b7053SJung-uk Kim      NID_undef, NID_undef},
724e71b7053SJung-uk Kim     {"rsa_pss_pss_sha512", TLSEXT_SIGALG_rsa_pss_pss_sha512,
725e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
726e71b7053SJung-uk Kim      NID_undef, NID_undef},
727e71b7053SJung-uk Kim     {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
728e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
729e71b7053SJung-uk Kim      NID_sha256WithRSAEncryption, NID_undef},
730e71b7053SJung-uk Kim     {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
731e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
732e71b7053SJung-uk Kim      NID_sha384WithRSAEncryption, NID_undef},
733e71b7053SJung-uk Kim     {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
734e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
735e71b7053SJung-uk Kim      NID_sha512WithRSAEncryption, NID_undef},
736e71b7053SJung-uk Kim     {"rsa_pkcs1_sha224", TLSEXT_SIGALG_rsa_pkcs1_sha224,
737e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
738e71b7053SJung-uk Kim      NID_sha224WithRSAEncryption, NID_undef},
739e71b7053SJung-uk Kim     {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
740e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
741e71b7053SJung-uk Kim      NID_sha1WithRSAEncryption, NID_undef},
742e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DSA
743e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha256,
744e71b7053SJung-uk Kim      NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
745e71b7053SJung-uk Kim      NID_dsa_with_SHA256, NID_undef},
746e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha384,
747e71b7053SJung-uk Kim      NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
748e71b7053SJung-uk Kim      NID_undef, NID_undef},
749e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha512,
750e71b7053SJung-uk Kim      NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
751e71b7053SJung-uk Kim      NID_undef, NID_undef},
752e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha224,
753e71b7053SJung-uk Kim      NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
754e71b7053SJung-uk Kim      NID_undef, NID_undef},
755e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_dsa_sha1,
756e71b7053SJung-uk Kim      NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
757e71b7053SJung-uk Kim      NID_dsaWithSHA1, NID_undef},
758e71b7053SJung-uk Kim #endif
759e71b7053SJung-uk Kim #ifndef OPENSSL_NO_GOST
760e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
761e71b7053SJung-uk Kim      NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
762e71b7053SJung-uk Kim      NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
763e71b7053SJung-uk Kim      NID_undef, NID_undef},
764e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
765e71b7053SJung-uk Kim      NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
766e71b7053SJung-uk Kim      NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
767e71b7053SJung-uk Kim      NID_undef, NID_undef},
768e71b7053SJung-uk Kim     {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
769e71b7053SJung-uk Kim      NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
770e71b7053SJung-uk Kim      NID_id_GostR3410_2001, SSL_PKEY_GOST01,
771e71b7053SJung-uk Kim      NID_undef, NID_undef}
772e71b7053SJung-uk Kim #endif
773e71b7053SJung-uk Kim };
774e71b7053SJung-uk Kim /* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
775e71b7053SJung-uk Kim static const SIGALG_LOOKUP legacy_rsa_sigalg = {
776e71b7053SJung-uk Kim     "rsa_pkcs1_md5_sha1", 0,
777e71b7053SJung-uk Kim      NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
778e71b7053SJung-uk Kim      EVP_PKEY_RSA, SSL_PKEY_RSA,
779e71b7053SJung-uk Kim      NID_undef, NID_undef
780e71b7053SJung-uk Kim };
7811f13597dSJung-uk Kim 
7826f9291ceSJung-uk Kim /*
783e71b7053SJung-uk Kim  * Default signature algorithm values used if signature algorithms not present.
784e71b7053SJung-uk Kim  * From RFC5246. Note: order must match certificate index order.
7851f13597dSJung-uk Kim  */
786e71b7053SJung-uk Kim static const uint16_t tls_default_sigalg[] = {
787e71b7053SJung-uk Kim     TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
788e71b7053SJung-uk Kim     0, /* SSL_PKEY_RSA_PSS_SIGN */
789e71b7053SJung-uk Kim     TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
790e71b7053SJung-uk Kim     TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
791e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
792e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256, /* SSL_PKEY_GOST12_256 */
793e71b7053SJung-uk Kim     TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512, /* SSL_PKEY_GOST12_512 */
794e71b7053SJung-uk Kim     0, /* SSL_PKEY_ED25519 */
795e71b7053SJung-uk Kim     0, /* SSL_PKEY_ED448 */
7961f13597dSJung-uk Kim };
7971f13597dSJung-uk Kim 
798e71b7053SJung-uk Kim /* Lookup TLS signature algorithm */
799e71b7053SJung-uk Kim static const SIGALG_LOOKUP *tls1_lookup_sigalg(uint16_t sigalg)
800e71b7053SJung-uk Kim {
801e71b7053SJung-uk Kim     size_t i;
802e71b7053SJung-uk Kim     const SIGALG_LOOKUP *s;
803e71b7053SJung-uk Kim 
804e71b7053SJung-uk Kim     for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
805e71b7053SJung-uk Kim          i++, s++) {
806e71b7053SJung-uk Kim         if (s->sigalg == sigalg)
807e71b7053SJung-uk Kim             return s;
808e71b7053SJung-uk Kim     }
809e71b7053SJung-uk Kim     return NULL;
810e71b7053SJung-uk Kim }
811e71b7053SJung-uk Kim /* Lookup hash: return 0 if invalid or not enabled */
812e71b7053SJung-uk Kim int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd)
813e71b7053SJung-uk Kim {
814e71b7053SJung-uk Kim     const EVP_MD *md;
815e71b7053SJung-uk Kim     if (lu == NULL)
816e71b7053SJung-uk Kim         return 0;
817e71b7053SJung-uk Kim     /* lu->hash == NID_undef means no associated digest */
818e71b7053SJung-uk Kim     if (lu->hash == NID_undef) {
819e71b7053SJung-uk Kim         md = NULL;
820e71b7053SJung-uk Kim     } else {
821e71b7053SJung-uk Kim         md = ssl_md(lu->hash_idx);
822e71b7053SJung-uk Kim         if (md == NULL)
823e71b7053SJung-uk Kim             return 0;
824e71b7053SJung-uk Kim     }
825e71b7053SJung-uk Kim     if (pmd)
826e71b7053SJung-uk Kim         *pmd = md;
827e71b7053SJung-uk Kim     return 1;
828e71b7053SJung-uk Kim }
829e71b7053SJung-uk Kim 
830e71b7053SJung-uk Kim /*
831e71b7053SJung-uk Kim  * Check if key is large enough to generate RSA-PSS signature.
832e71b7053SJung-uk Kim  *
833e71b7053SJung-uk Kim  * The key must greater than or equal to 2 * hash length + 2.
834e71b7053SJung-uk Kim  * SHA512 has a hash length of 64 bytes, which is incompatible
835e71b7053SJung-uk Kim  * with a 128 byte (1024 bit) key.
836e71b7053SJung-uk Kim  */
837e71b7053SJung-uk Kim #define RSA_PSS_MINIMUM_KEY_SIZE(md) (2 * EVP_MD_size(md) + 2)
838e71b7053SJung-uk Kim static int rsa_pss_check_min_key_size(const RSA *rsa, const SIGALG_LOOKUP *lu)
839e71b7053SJung-uk Kim {
840e71b7053SJung-uk Kim     const EVP_MD *md;
841e71b7053SJung-uk Kim 
842e71b7053SJung-uk Kim     if (rsa == NULL)
843e71b7053SJung-uk Kim         return 0;
844e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, &md) || md == NULL)
845e71b7053SJung-uk Kim         return 0;
846e71b7053SJung-uk Kim     if (RSA_size(rsa) < RSA_PSS_MINIMUM_KEY_SIZE(md))
847e71b7053SJung-uk Kim         return 0;
848e71b7053SJung-uk Kim     return 1;
849e71b7053SJung-uk Kim }
850e71b7053SJung-uk Kim 
851e71b7053SJung-uk Kim /*
852e71b7053SJung-uk Kim  * Return a signature algorithm for TLS < 1.2 where the signature type
853e71b7053SJung-uk Kim  * is fixed by the certificate type.
854e71b7053SJung-uk Kim  */
855e71b7053SJung-uk Kim static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
856e71b7053SJung-uk Kim {
857e71b7053SJung-uk Kim     if (idx == -1) {
858e71b7053SJung-uk Kim         if (s->server) {
859e71b7053SJung-uk Kim             size_t i;
860e71b7053SJung-uk Kim 
861e71b7053SJung-uk Kim             /* Work out index corresponding to ciphersuite */
862e71b7053SJung-uk Kim             for (i = 0; i < SSL_PKEY_NUM; i++) {
863e71b7053SJung-uk Kim                 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(i);
864e71b7053SJung-uk Kim 
865e71b7053SJung-uk Kim                 if (clu->amask & s->s3->tmp.new_cipher->algorithm_auth) {
866e71b7053SJung-uk Kim                     idx = i;
867e71b7053SJung-uk Kim                     break;
868e71b7053SJung-uk Kim                 }
869e71b7053SJung-uk Kim             }
870e71b7053SJung-uk Kim 
871e71b7053SJung-uk Kim             /*
872e71b7053SJung-uk Kim              * Some GOST ciphersuites allow more than one signature algorithms
873e71b7053SJung-uk Kim              * */
874e71b7053SJung-uk Kim             if (idx == SSL_PKEY_GOST01 && s->s3->tmp.new_cipher->algorithm_auth != SSL_aGOST01) {
875e71b7053SJung-uk Kim                 int real_idx;
876e71b7053SJung-uk Kim 
877e71b7053SJung-uk Kim                 for (real_idx = SSL_PKEY_GOST12_512; real_idx >= SSL_PKEY_GOST01;
878e71b7053SJung-uk Kim                      real_idx--) {
879e71b7053SJung-uk Kim                     if (s->cert->pkeys[real_idx].privatekey != NULL) {
880e71b7053SJung-uk Kim                         idx = real_idx;
881e71b7053SJung-uk Kim                         break;
882e71b7053SJung-uk Kim                     }
883e71b7053SJung-uk Kim                 }
884e71b7053SJung-uk Kim             }
885e71b7053SJung-uk Kim         } else {
886e71b7053SJung-uk Kim             idx = s->cert->key - s->cert->pkeys;
887e71b7053SJung-uk Kim         }
888e71b7053SJung-uk Kim     }
889e71b7053SJung-uk Kim     if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
890e71b7053SJung-uk Kim         return NULL;
891e71b7053SJung-uk Kim     if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
892e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(tls_default_sigalg[idx]);
893e71b7053SJung-uk Kim 
894e71b7053SJung-uk Kim         if (!tls1_lookup_md(lu, NULL))
895e71b7053SJung-uk Kim             return NULL;
896e71b7053SJung-uk Kim         return lu;
897e71b7053SJung-uk Kim     }
898e71b7053SJung-uk Kim     return &legacy_rsa_sigalg;
899e71b7053SJung-uk Kim }
900e71b7053SJung-uk Kim /* Set peer sigalg based key type */
901e71b7053SJung-uk Kim int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
902e71b7053SJung-uk Kim {
903e71b7053SJung-uk Kim     size_t idx;
904e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
905e71b7053SJung-uk Kim 
906e71b7053SJung-uk Kim     if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
907e71b7053SJung-uk Kim         return 0;
908e71b7053SJung-uk Kim     lu = tls1_get_legacy_sigalg(s, idx);
909e71b7053SJung-uk Kim     if (lu == NULL)
910e71b7053SJung-uk Kim         return 0;
911e71b7053SJung-uk Kim     s->s3->tmp.peer_sigalg = lu;
912e71b7053SJung-uk Kim     return 1;
913e71b7053SJung-uk Kim }
914e71b7053SJung-uk Kim 
915e71b7053SJung-uk Kim size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
9161f13597dSJung-uk Kim {
9177bded2dbSJung-uk Kim     /*
9187bded2dbSJung-uk Kim      * If Suite B mode use Suite B sigalgs only, ignore any other
9197bded2dbSJung-uk Kim      * preferences.
9207bded2dbSJung-uk Kim      */
9217bded2dbSJung-uk Kim #ifndef OPENSSL_NO_EC
9227bded2dbSJung-uk Kim     switch (tls1_suiteb(s)) {
9237bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS:
9247bded2dbSJung-uk Kim         *psigs = suiteb_sigalgs;
925e71b7053SJung-uk Kim         return OSSL_NELEM(suiteb_sigalgs);
9267bded2dbSJung-uk Kim 
9277bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
9287bded2dbSJung-uk Kim         *psigs = suiteb_sigalgs;
929e71b7053SJung-uk Kim         return 1;
9307bded2dbSJung-uk Kim 
9317bded2dbSJung-uk Kim     case SSL_CERT_FLAG_SUITEB_192_LOS:
932e71b7053SJung-uk Kim         *psigs = suiteb_sigalgs + 1;
933e71b7053SJung-uk Kim         return 1;
9347bded2dbSJung-uk Kim     }
9357bded2dbSJung-uk Kim #endif
936e71b7053SJung-uk Kim     /*
937e71b7053SJung-uk Kim      *  We use client_sigalgs (if not NULL) if we're a server
938e71b7053SJung-uk Kim      *  and sending a certificate request or if we're a client and
939e71b7053SJung-uk Kim      *  determining which shared algorithm to use.
940e71b7053SJung-uk Kim      */
941e71b7053SJung-uk Kim     if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
9427bded2dbSJung-uk Kim         *psigs = s->cert->client_sigalgs;
9437bded2dbSJung-uk Kim         return s->cert->client_sigalgslen;
9447bded2dbSJung-uk Kim     } else if (s->cert->conf_sigalgs) {
9457bded2dbSJung-uk Kim         *psigs = s->cert->conf_sigalgs;
9467bded2dbSJung-uk Kim         return s->cert->conf_sigalgslen;
9477bded2dbSJung-uk Kim     } else {
9487bded2dbSJung-uk Kim         *psigs = tls12_sigalgs;
949e71b7053SJung-uk Kim         return OSSL_NELEM(tls12_sigalgs);
9507bded2dbSJung-uk Kim     }
9517bded2dbSJung-uk Kim }
9527bded2dbSJung-uk Kim 
953c9cf7b5cSJung-uk Kim #ifndef OPENSSL_NO_EC
954c9cf7b5cSJung-uk Kim /*
955c9cf7b5cSJung-uk Kim  * Called by servers only. Checks that we have a sig alg that supports the
956c9cf7b5cSJung-uk Kim  * specified EC curve.
957c9cf7b5cSJung-uk Kim  */
958c9cf7b5cSJung-uk Kim int tls_check_sigalg_curve(const SSL *s, int curve)
959c9cf7b5cSJung-uk Kim {
960c9cf7b5cSJung-uk Kim    const uint16_t *sigs;
961c9cf7b5cSJung-uk Kim    size_t siglen, i;
962c9cf7b5cSJung-uk Kim 
963c9cf7b5cSJung-uk Kim     if (s->cert->conf_sigalgs) {
964c9cf7b5cSJung-uk Kim         sigs = s->cert->conf_sigalgs;
965c9cf7b5cSJung-uk Kim         siglen = s->cert->conf_sigalgslen;
966c9cf7b5cSJung-uk Kim     } else {
967c9cf7b5cSJung-uk Kim         sigs = tls12_sigalgs;
968c9cf7b5cSJung-uk Kim         siglen = OSSL_NELEM(tls12_sigalgs);
969c9cf7b5cSJung-uk Kim     }
970c9cf7b5cSJung-uk Kim 
971c9cf7b5cSJung-uk Kim     for (i = 0; i < siglen; i++) {
972c9cf7b5cSJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(sigs[i]);
973c9cf7b5cSJung-uk Kim 
974c9cf7b5cSJung-uk Kim         if (lu == NULL)
975c9cf7b5cSJung-uk Kim             continue;
976c9cf7b5cSJung-uk Kim         if (lu->sig == EVP_PKEY_EC
977c9cf7b5cSJung-uk Kim                 && lu->curve != NID_undef
978c9cf7b5cSJung-uk Kim                 && curve == lu->curve)
979c9cf7b5cSJung-uk Kim             return 1;
980c9cf7b5cSJung-uk Kim     }
981c9cf7b5cSJung-uk Kim 
982c9cf7b5cSJung-uk Kim     return 0;
983c9cf7b5cSJung-uk Kim }
984c9cf7b5cSJung-uk Kim #endif
985c9cf7b5cSJung-uk Kim 
9867bded2dbSJung-uk Kim /*
9877bded2dbSJung-uk Kim  * Check signature algorithm is consistent with sent supported signature
988e71b7053SJung-uk Kim  * algorithms and if so set relevant digest and signature scheme in
989e71b7053SJung-uk Kim  * s.
9907bded2dbSJung-uk Kim  */
991e71b7053SJung-uk Kim int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
9927bded2dbSJung-uk Kim {
993e71b7053SJung-uk Kim     const uint16_t *sent_sigs;
994e71b7053SJung-uk Kim     const EVP_MD *md = NULL;
995e71b7053SJung-uk Kim     char sigalgstr[2];
996e71b7053SJung-uk Kim     size_t sent_sigslen, i, cidx;
997e71b7053SJung-uk Kim     int pkeyid = EVP_PKEY_id(pkey);
998e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
999e71b7053SJung-uk Kim 
10007bded2dbSJung-uk Kim     /* Should never happen */
1001e71b7053SJung-uk Kim     if (pkeyid == -1)
10027bded2dbSJung-uk Kim         return -1;
1003e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s)) {
1004e71b7053SJung-uk Kim         /* Disallow DSA for TLS 1.3 */
1005e71b7053SJung-uk Kim         if (pkeyid == EVP_PKEY_DSA) {
1006e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1007e71b7053SJung-uk Kim                      SSL_R_WRONG_SIGNATURE_TYPE);
10087bded2dbSJung-uk Kim             return 0;
10097bded2dbSJung-uk Kim         }
1010e71b7053SJung-uk Kim         /* Only allow PSS for TLS 1.3 */
1011e71b7053SJung-uk Kim         if (pkeyid == EVP_PKEY_RSA)
1012e71b7053SJung-uk Kim             pkeyid = EVP_PKEY_RSA_PSS;
1013e71b7053SJung-uk Kim     }
1014e71b7053SJung-uk Kim     lu = tls1_lookup_sigalg(sig);
1015e71b7053SJung-uk Kim     /*
1016e71b7053SJung-uk Kim      * Check sigalgs is known. Disallow SHA1/SHA224 with TLS 1.3. Check key type
1017e71b7053SJung-uk Kim      * is consistent with signature: RSA keys can be used for RSA-PSS
1018e71b7053SJung-uk Kim      */
1019e71b7053SJung-uk Kim     if (lu == NULL
1020e71b7053SJung-uk Kim         || (SSL_IS_TLS13(s) && (lu->hash == NID_sha1 || lu->hash == NID_sha224))
1021e71b7053SJung-uk Kim         || (pkeyid != lu->sig
1022e71b7053SJung-uk Kim         && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
1023e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1024e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
1025e71b7053SJung-uk Kim         return 0;
1026e71b7053SJung-uk Kim     }
1027e71b7053SJung-uk Kim     /* Check the sigalg is consistent with the key OID */
1028e71b7053SJung-uk Kim     if (!ssl_cert_lookup_by_nid(EVP_PKEY_id(pkey), &cidx)
1029e71b7053SJung-uk Kim             || lu->sig_idx != (int)cidx) {
1030e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS12_CHECK_PEER_SIGALG,
1031e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
1032e71b7053SJung-uk Kim         return 0;
1033e71b7053SJung-uk Kim     }
1034e71b7053SJung-uk Kim 
10357bded2dbSJung-uk Kim #ifndef OPENSSL_NO_EC
1036e71b7053SJung-uk Kim     if (pkeyid == EVP_PKEY_EC) {
1037e71b7053SJung-uk Kim 
1038e71b7053SJung-uk Kim         /* Check point compression is permitted */
1039e71b7053SJung-uk Kim         if (!tls1_check_pkey_comp(s, pkey)) {
1040e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1041e71b7053SJung-uk Kim                      SSL_F_TLS12_CHECK_PEER_SIGALG,
1042e71b7053SJung-uk Kim                      SSL_R_ILLEGAL_POINT_COMPRESSION);
10437bded2dbSJung-uk Kim             return 0;
10447bded2dbSJung-uk Kim         }
1045e71b7053SJung-uk Kim 
1046e71b7053SJung-uk Kim         /* For TLS 1.3 or Suite B check curve matches signature algorithm */
1047e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s) || tls1_suiteb(s)) {
1048e71b7053SJung-uk Kim             EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
1049e71b7053SJung-uk Kim             int curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
1050e71b7053SJung-uk Kim 
1051e71b7053SJung-uk Kim             if (lu->curve != NID_undef && curve != lu->curve) {
1052e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1053e71b7053SJung-uk Kim                          SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
1054e71b7053SJung-uk Kim                 return 0;
1055e71b7053SJung-uk Kim             }
1056e71b7053SJung-uk Kim         }
1057e71b7053SJung-uk Kim         if (!SSL_IS_TLS13(s)) {
1058e71b7053SJung-uk Kim             /* Check curve matches extensions */
1059e71b7053SJung-uk Kim             if (!tls1_check_group_id(s, tls1_get_group_id(pkey), 1)) {
1060e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1061e71b7053SJung-uk Kim                          SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
1062e71b7053SJung-uk Kim                 return 0;
1063e71b7053SJung-uk Kim             }
10647bded2dbSJung-uk Kim             if (tls1_suiteb(s)) {
1065e71b7053SJung-uk Kim                 /* Check sigalg matches a permissible Suite B value */
1066e71b7053SJung-uk Kim                 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
1067e71b7053SJung-uk Kim                     && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
1068e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1069e71b7053SJung-uk Kim                              SSL_F_TLS12_CHECK_PEER_SIGALG,
1070e71b7053SJung-uk Kim                              SSL_R_WRONG_SIGNATURE_TYPE);
10717bded2dbSJung-uk Kim                     return 0;
10727bded2dbSJung-uk Kim                 }
1073e71b7053SJung-uk Kim             }
1074e71b7053SJung-uk Kim         }
1075e71b7053SJung-uk Kim     } else if (tls1_suiteb(s)) {
1076e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1077e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
10787bded2dbSJung-uk Kim         return 0;
10797bded2dbSJung-uk Kim     }
10807bded2dbSJung-uk Kim #endif
10817bded2dbSJung-uk Kim 
10827bded2dbSJung-uk Kim     /* Check signature matches a type we sent */
1083ed7112f0SJung-uk Kim     sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1084e71b7053SJung-uk Kim     for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
1085e71b7053SJung-uk Kim         if (sig == *sent_sigs)
10867bded2dbSJung-uk Kim             break;
10877bded2dbSJung-uk Kim     }
10887bded2dbSJung-uk Kim     /* Allow fallback to SHA1 if not strict mode */
1089e71b7053SJung-uk Kim     if (i == sent_sigslen && (lu->hash != NID_sha1
10907bded2dbSJung-uk Kim         || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
1091e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1092e71b7053SJung-uk Kim                  SSL_R_WRONG_SIGNATURE_TYPE);
10937bded2dbSJung-uk Kim         return 0;
10947bded2dbSJung-uk Kim     }
1095e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, &md)) {
1096e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1097e71b7053SJung-uk Kim                  SSL_R_UNKNOWN_DIGEST);
10987bded2dbSJung-uk Kim         return 0;
10997bded2dbSJung-uk Kim     }
1100e71b7053SJung-uk Kim     if (md != NULL) {
11017bded2dbSJung-uk Kim         /*
1102e71b7053SJung-uk Kim          * Make sure security callback allows algorithm. For historical
1103e71b7053SJung-uk Kim          * reasons we have to pass the sigalg as a two byte char array.
11047bded2dbSJung-uk Kim          */
1105e71b7053SJung-uk Kim         sigalgstr[0] = (sig >> 8) & 0xff;
1106e71b7053SJung-uk Kim         sigalgstr[1] = sig & 0xff;
1107e71b7053SJung-uk Kim         if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
1108e71b7053SJung-uk Kim                     EVP_MD_size(md) * 4, EVP_MD_type(md),
1109e71b7053SJung-uk Kim                     (void *)sigalgstr)) {
1110e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS12_CHECK_PEER_SIGALG,
1111e71b7053SJung-uk Kim                      SSL_R_WRONG_SIGNATURE_TYPE);
1112e71b7053SJung-uk Kim             return 0;
1113e71b7053SJung-uk Kim         }
1114e71b7053SJung-uk Kim     }
1115e71b7053SJung-uk Kim     /* Store the sigalg the peer uses */
1116e71b7053SJung-uk Kim     s->s3->tmp.peer_sigalg = lu;
1117e71b7053SJung-uk Kim     return 1;
1118e71b7053SJung-uk Kim }
1119e71b7053SJung-uk Kim 
1120e71b7053SJung-uk Kim int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
1121e71b7053SJung-uk Kim {
1122e71b7053SJung-uk Kim     if (s->s3->tmp.peer_sigalg == NULL)
1123e71b7053SJung-uk Kim         return 0;
1124e71b7053SJung-uk Kim     *pnid = s->s3->tmp.peer_sigalg->sig;
11257bded2dbSJung-uk Kim     return 1;
11267bded2dbSJung-uk Kim }
11277bded2dbSJung-uk Kim 
1128c9cf7b5cSJung-uk Kim int SSL_get_signature_type_nid(const SSL *s, int *pnid)
1129c9cf7b5cSJung-uk Kim {
1130c9cf7b5cSJung-uk Kim     if (s->s3->tmp.sigalg == NULL)
1131c9cf7b5cSJung-uk Kim         return 0;
1132c9cf7b5cSJung-uk Kim     *pnid = s->s3->tmp.sigalg->sig;
1133c9cf7b5cSJung-uk Kim     return 1;
1134c9cf7b5cSJung-uk Kim }
1135c9cf7b5cSJung-uk Kim 
11367bded2dbSJung-uk Kim /*
1137e71b7053SJung-uk Kim  * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1138e71b7053SJung-uk Kim  * supported, doesn't appear in supported signature algorithms, isn't supported
1139e71b7053SJung-uk Kim  * by the enabled protocol versions or by the security level.
1140e71b7053SJung-uk Kim  *
1141e71b7053SJung-uk Kim  * This function should only be used for checking which ciphers are supported
1142e71b7053SJung-uk Kim  * by the client.
1143e71b7053SJung-uk Kim  *
1144e71b7053SJung-uk Kim  * Call ssl_cipher_disabled() to check that it's enabled or not.
11457bded2dbSJung-uk Kim  */
1146e71b7053SJung-uk Kim int ssl_set_client_disabled(SSL *s)
11477bded2dbSJung-uk Kim {
1148e71b7053SJung-uk Kim     s->s3->tmp.mask_a = 0;
1149e71b7053SJung-uk Kim     s->s3->tmp.mask_k = 0;
1150e71b7053SJung-uk Kim     ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
1151e71b7053SJung-uk Kim     if (ssl_get_min_max_version(s, &s->s3->tmp.min_ver,
1152e71b7053SJung-uk Kim                                 &s->s3->tmp.max_ver, NULL) != 0)
1153e71b7053SJung-uk Kim         return 0;
11547bded2dbSJung-uk Kim #ifndef OPENSSL_NO_PSK
11557bded2dbSJung-uk Kim     /* with PSK there must be client callback set */
11567bded2dbSJung-uk Kim     if (!s->psk_client_callback) {
1157e71b7053SJung-uk Kim         s->s3->tmp.mask_a |= SSL_aPSK;
1158e71b7053SJung-uk Kim         s->s3->tmp.mask_k |= SSL_PSK;
11597bded2dbSJung-uk Kim     }
11607bded2dbSJung-uk Kim #endif                          /* OPENSSL_NO_PSK */
11617bded2dbSJung-uk Kim #ifndef OPENSSL_NO_SRP
11627bded2dbSJung-uk Kim     if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
1163e71b7053SJung-uk Kim         s->s3->tmp.mask_a |= SSL_aSRP;
1164e71b7053SJung-uk Kim         s->s3->tmp.mask_k |= SSL_kSRP;
11657bded2dbSJung-uk Kim     }
11667bded2dbSJung-uk Kim #endif
1167e71b7053SJung-uk Kim     return 1;
11681f13597dSJung-uk Kim }
11691f13597dSJung-uk Kim 
11706f9291ceSJung-uk Kim /*
1171e71b7053SJung-uk Kim  * ssl_cipher_disabled - check that a cipher is disabled or not
1172e71b7053SJung-uk Kim  * @s: SSL connection that you want to use the cipher on
1173e71b7053SJung-uk Kim  * @c: cipher to check
1174e71b7053SJung-uk Kim  * @op: Security check that you want to do
1175e71b7053SJung-uk Kim  * @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
11766cf8931aSJung-uk Kim  *
1177e71b7053SJung-uk Kim  * Returns 1 when it's disabled, 0 when enabled.
11786cf8931aSJung-uk Kim  */
1179e71b7053SJung-uk Kim int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
1180db522d3aSSimon L. B. Nielsen {
1181e71b7053SJung-uk Kim     if (c->algorithm_mkey & s->s3->tmp.mask_k
1182e71b7053SJung-uk Kim         || c->algorithm_auth & s->s3->tmp.mask_a)
1183e71b7053SJung-uk Kim         return 1;
1184e71b7053SJung-uk Kim     if (s->s3->tmp.max_ver == 0)
1185e71b7053SJung-uk Kim         return 1;
1186e71b7053SJung-uk Kim     if (!SSL_IS_DTLS(s)) {
1187e71b7053SJung-uk Kim         int min_tls = c->min_tls;
1188de78d5d8SJung-uk Kim 
11897bded2dbSJung-uk Kim         /*
1190e71b7053SJung-uk Kim          * For historical reasons we will allow ECHDE to be selected by a server
1191e71b7053SJung-uk Kim          * in SSLv3 if we are a client
11927bded2dbSJung-uk Kim          */
1193e71b7053SJung-uk Kim         if (min_tls == TLS1_VERSION && ecdhe
1194e71b7053SJung-uk Kim                 && (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
1195e71b7053SJung-uk Kim             min_tls = SSL3_VERSION;
11967bded2dbSJung-uk Kim 
1197e71b7053SJung-uk Kim         if ((min_tls > s->s3->tmp.max_ver) || (c->max_tls < s->s3->tmp.min_ver))
1198b8721c16SJung-uk Kim             return 1;
1199b8721c16SJung-uk Kim     }
1200e71b7053SJung-uk Kim     if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
1201e71b7053SJung-uk Kim                            || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
12027bded2dbSJung-uk Kim         return 1;
12037bded2dbSJung-uk Kim 
1204e71b7053SJung-uk Kim     return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
12057bded2dbSJung-uk Kim }
12067bded2dbSJung-uk Kim 
1207e71b7053SJung-uk Kim int tls_use_ticket(SSL *s)
12087bded2dbSJung-uk Kim {
1209e71b7053SJung-uk Kim     if ((s->options & SSL_OP_NO_TICKET))
12107bded2dbSJung-uk Kim         return 0;
1211e71b7053SJung-uk Kim     return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1212db522d3aSSimon L. B. Nielsen }
1213db522d3aSSimon L. B. Nielsen 
12147bded2dbSJung-uk Kim int tls1_set_server_sigalgs(SSL *s)
12157bded2dbSJung-uk Kim {
12167bded2dbSJung-uk Kim     size_t i;
1217e71b7053SJung-uk Kim 
1218e71b7053SJung-uk Kim     /* Clear any shared signature algorithms */
1219*da327cd2SJung-uk Kim     OPENSSL_free(s->shared_sigalgs);
1220*da327cd2SJung-uk Kim     s->shared_sigalgs = NULL;
1221*da327cd2SJung-uk Kim     s->shared_sigalgslen = 0;
1222e71b7053SJung-uk Kim     /* Clear certificate validity flags */
1223e71b7053SJung-uk Kim     for (i = 0; i < SSL_PKEY_NUM; i++)
1224e71b7053SJung-uk Kim         s->s3->tmp.valid_flags[i] = 0;
1225e71b7053SJung-uk Kim     /*
1226e71b7053SJung-uk Kim      * If peer sent no signature algorithms check to see if we support
1227e71b7053SJung-uk Kim      * the default algorithm for each certificate type
1228e71b7053SJung-uk Kim      */
1229e71b7053SJung-uk Kim     if (s->s3->tmp.peer_cert_sigalgs == NULL
1230e71b7053SJung-uk Kim             && s->s3->tmp.peer_sigalgs == NULL) {
1231e71b7053SJung-uk Kim         const uint16_t *sent_sigs;
1232e71b7053SJung-uk Kim         size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1233e71b7053SJung-uk Kim 
12347bded2dbSJung-uk Kim         for (i = 0; i < SSL_PKEY_NUM; i++) {
1235e71b7053SJung-uk Kim             const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1236e71b7053SJung-uk Kim             size_t j;
1237e71b7053SJung-uk Kim 
1238e71b7053SJung-uk Kim             if (lu == NULL)
1239e71b7053SJung-uk Kim                 continue;
1240e71b7053SJung-uk Kim             /* Check default matches a type we sent */
1241e71b7053SJung-uk Kim             for (j = 0; j < sent_sigslen; j++) {
1242e71b7053SJung-uk Kim                 if (lu->sigalg == sent_sigs[j]) {
1243e71b7053SJung-uk Kim                         s->s3->tmp.valid_flags[i] = CERT_PKEY_SIGN;
1244e71b7053SJung-uk Kim                         break;
1245e71b7053SJung-uk Kim                 }
1246e71b7053SJung-uk Kim             }
1247e71b7053SJung-uk Kim         }
1248e71b7053SJung-uk Kim         return 1;
12497bded2dbSJung-uk Kim     }
12507bded2dbSJung-uk Kim 
12517bded2dbSJung-uk Kim     if (!tls1_process_sigalgs(s)) {
1252e71b7053SJung-uk Kim         SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1253e71b7053SJung-uk Kim                  SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_INTERNAL_ERROR);
12547bded2dbSJung-uk Kim         return 0;
12557bded2dbSJung-uk Kim     }
1256*da327cd2SJung-uk Kim     if (s->shared_sigalgs != NULL)
1257e71b7053SJung-uk Kim         return 1;
12587bded2dbSJung-uk Kim 
1259e71b7053SJung-uk Kim     /* Fatal error if no shared signature algorithms */
1260e71b7053SJung-uk Kim     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS1_SET_SERVER_SIGALGS,
1261e71b7053SJung-uk Kim              SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
12626cf8931aSJung-uk Kim     return 0;
126309286989SJung-uk Kim }
12647bded2dbSJung-uk Kim 
12656f9291ceSJung-uk Kim /*-
1266e71b7053SJung-uk Kim  * Gets the ticket information supplied by the client if any.
12671f13597dSJung-uk Kim  *
1268e71b7053SJung-uk Kim  *   hello: The parsed ClientHello data
12691f13597dSJung-uk Kim  *   ret: (output) on return, if a ticket was decrypted, then this is set to
12701f13597dSJung-uk Kim  *       point to the resulting session.
1271e71b7053SJung-uk Kim  */
1272e71b7053SJung-uk Kim SSL_TICKET_STATUS tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1273e71b7053SJung-uk Kim                                              SSL_SESSION **ret)
1274e71b7053SJung-uk Kim {
1275e71b7053SJung-uk Kim     size_t size;
1276e71b7053SJung-uk Kim     RAW_EXTENSION *ticketext;
1277e71b7053SJung-uk Kim 
1278e71b7053SJung-uk Kim     *ret = NULL;
1279e71b7053SJung-uk Kim     s->ext.ticket_expected = 0;
1280e71b7053SJung-uk Kim 
1281e71b7053SJung-uk Kim     /*
1282e71b7053SJung-uk Kim      * If tickets disabled or not supported by the protocol version
1283e71b7053SJung-uk Kim      * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
1284e71b7053SJung-uk Kim      * resumption.
1285e71b7053SJung-uk Kim      */
1286e71b7053SJung-uk Kim     if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
1287e71b7053SJung-uk Kim         return SSL_TICKET_NONE;
1288e71b7053SJung-uk Kim 
1289e71b7053SJung-uk Kim     ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1290e71b7053SJung-uk Kim     if (!ticketext->present)
1291e71b7053SJung-uk Kim         return SSL_TICKET_NONE;
1292e71b7053SJung-uk Kim 
1293e71b7053SJung-uk Kim     size = PACKET_remaining(&ticketext->data);
1294e71b7053SJung-uk Kim 
1295e71b7053SJung-uk Kim     return tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1296e71b7053SJung-uk Kim                               hello->session_id, hello->session_id_len, ret);
1297e71b7053SJung-uk Kim }
1298e71b7053SJung-uk Kim 
1299e71b7053SJung-uk Kim /*-
1300e71b7053SJung-uk Kim  * tls_decrypt_ticket attempts to decrypt a session ticket.
13011f13597dSJung-uk Kim  *
1302e71b7053SJung-uk Kim  * If s->tls_session_secret_cb is set and we're not doing TLSv1.3 then we are
1303e71b7053SJung-uk Kim  * expecting a pre-shared key ciphersuite, in which case we have no use for
1304e71b7053SJung-uk Kim  * session tickets and one will never be decrypted, nor will
1305e71b7053SJung-uk Kim  * s->ext.ticket_expected be set to 1.
13061f13597dSJung-uk Kim  *
13071f13597dSJung-uk Kim  * Side effects:
1308e71b7053SJung-uk Kim  *   Sets s->ext.ticket_expected to 1 if the server will have to issue
13091f13597dSJung-uk Kim  *   a new session ticket to the client because the client indicated support
13101f13597dSJung-uk Kim  *   (and s->tls_session_secret_cb is NULL) but the client either doesn't have
13111f13597dSJung-uk Kim  *   a session ticket or we couldn't use the one it gave us, or if
1312e71b7053SJung-uk Kim  *   s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1313e71b7053SJung-uk Kim  *   Otherwise, s->ext.ticket_expected is set to 0.
1314e71b7053SJung-uk Kim  *
1315e71b7053SJung-uk Kim  *   etick: points to the body of the session ticket extension.
1316e71b7053SJung-uk Kim  *   eticklen: the length of the session tickets extension.
1317e71b7053SJung-uk Kim  *   sess_id: points at the session ID.
1318e71b7053SJung-uk Kim  *   sesslen: the length of the session ID.
1319e71b7053SJung-uk Kim  *   psess: (output) on return, if a ticket was decrypted, then this is set to
1320e71b7053SJung-uk Kim  *       point to the resulting session.
1321db522d3aSSimon L. B. Nielsen  */
1322e71b7053SJung-uk Kim SSL_TICKET_STATUS tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1323e71b7053SJung-uk Kim                                      size_t eticklen, const unsigned char *sess_id,
1324e71b7053SJung-uk Kim                                      size_t sesslen, SSL_SESSION **psess)
1325db522d3aSSimon L. B. Nielsen {
1326e71b7053SJung-uk Kim     SSL_SESSION *sess = NULL;
1327e71b7053SJung-uk Kim     unsigned char *sdec;
1328e71b7053SJung-uk Kim     const unsigned char *p;
1329e71b7053SJung-uk Kim     int slen, renew_ticket = 0, declen;
1330e71b7053SJung-uk Kim     SSL_TICKET_STATUS ret = SSL_TICKET_FATAL_ERR_OTHER;
1331e71b7053SJung-uk Kim     size_t mlen;
1332e71b7053SJung-uk Kim     unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1333e71b7053SJung-uk Kim     HMAC_CTX *hctx = NULL;
1334e71b7053SJung-uk Kim     EVP_CIPHER_CTX *ctx = NULL;
1335e71b7053SJung-uk Kim     SSL_CTX *tctx = s->session_ctx;
1336db522d3aSSimon L. B. Nielsen 
1337e71b7053SJung-uk Kim     if (eticklen == 0) {
13386f9291ceSJung-uk Kim         /*
13396f9291ceSJung-uk Kim          * The client will accept a ticket but doesn't currently have
1340e71b7053SJung-uk Kim          * one (TLSv1.2 and below), or treated as a fatal error in TLSv1.3
13416f9291ceSJung-uk Kim          */
1342e71b7053SJung-uk Kim         ret = SSL_TICKET_EMPTY;
1343e71b7053SJung-uk Kim         goto end;
1344db522d3aSSimon L. B. Nielsen     }
1345e71b7053SJung-uk Kim     if (!SSL_IS_TLS13(s) && s->ext.session_secret_cb) {
13466f9291ceSJung-uk Kim         /*
13476f9291ceSJung-uk Kim          * Indicate that the ticket couldn't be decrypted rather than
13486f9291ceSJung-uk Kim          * generating the session from ticket now, trigger
13496f9291ceSJung-uk Kim          * abbreviated handshake based on external mechanism to
13506f9291ceSJung-uk Kim          * calculate the master secret later.
13516f9291ceSJung-uk Kim          */
1352e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1353e71b7053SJung-uk Kim         goto end;
13541f13597dSJung-uk Kim     }
1355aeb5019cSJung-uk Kim 
1356dee36b4fSJung-uk Kim     /* Need at least keyname + iv */
1357e71b7053SJung-uk Kim     if (eticklen < TLSEXT_KEYNAME_LENGTH + EVP_MAX_IV_LENGTH) {
1358e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1359e71b7053SJung-uk Kim         goto end;
1360e71b7053SJung-uk Kim     }
1361dee36b4fSJung-uk Kim 
1362db522d3aSSimon L. B. Nielsen     /* Initialize session ticket encryption and HMAC contexts */
1363e71b7053SJung-uk Kim     hctx = HMAC_CTX_new();
1364e71b7053SJung-uk Kim     if (hctx == NULL) {
1365e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_MALLOC;
1366e71b7053SJung-uk Kim         goto end;
1367e71b7053SJung-uk Kim     }
1368e71b7053SJung-uk Kim     ctx = EVP_CIPHER_CTX_new();
1369e71b7053SJung-uk Kim     if (ctx == NULL) {
1370e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_MALLOC;
1371e71b7053SJung-uk Kim         goto end;
1372e71b7053SJung-uk Kim     }
1373e71b7053SJung-uk Kim     if (tctx->ext.ticket_key_cb) {
1374db522d3aSSimon L. B. Nielsen         unsigned char *nctick = (unsigned char *)etick;
1375e71b7053SJung-uk Kim         int rv = tctx->ext.ticket_key_cb(s, nctick,
1376e71b7053SJung-uk Kim                                          nctick + TLSEXT_KEYNAME_LENGTH,
1377e71b7053SJung-uk Kim                                          ctx, hctx, 0);
1378e71b7053SJung-uk Kim         if (rv < 0) {
1379e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1380e71b7053SJung-uk Kim             goto end;
1381e71b7053SJung-uk Kim         }
1382dee36b4fSJung-uk Kim         if (rv == 0) {
1383e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1384e71b7053SJung-uk Kim             goto end;
1385dee36b4fSJung-uk Kim         }
1386db522d3aSSimon L. B. Nielsen         if (rv == 2)
1387db522d3aSSimon L. B. Nielsen             renew_ticket = 1;
13886f9291ceSJung-uk Kim     } else {
1389db522d3aSSimon L. B. Nielsen         /* Check key name matches */
1390e71b7053SJung-uk Kim         if (memcmp(etick, tctx->ext.tick_key_name,
1391e71b7053SJung-uk Kim                    TLSEXT_KEYNAME_LENGTH) != 0) {
1392e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1393e71b7053SJung-uk Kim             goto end;
139480815a77SJung-uk Kim         }
1395e71b7053SJung-uk Kim         if (HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key,
1396e71b7053SJung-uk Kim                          sizeof(tctx->ext.secure->tick_hmac_key),
1397e71b7053SJung-uk Kim                          EVP_sha256(), NULL) <= 0
1398e71b7053SJung-uk Kim             || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
1399e71b7053SJung-uk Kim                                   tctx->ext.secure->tick_aes_key,
1400e71b7053SJung-uk Kim                                   etick + TLSEXT_KEYNAME_LENGTH) <= 0) {
1401e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1402e71b7053SJung-uk Kim             goto end;
1403e71b7053SJung-uk Kim         }
1404e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s))
1405e71b7053SJung-uk Kim             renew_ticket = 1;
1406db522d3aSSimon L. B. Nielsen     }
14076f9291ceSJung-uk Kim     /*
14086f9291ceSJung-uk Kim      * Attempt to process session ticket, first conduct sanity and integrity
14096f9291ceSJung-uk Kim      * checks on ticket.
1410db522d3aSSimon L. B. Nielsen      */
1411e71b7053SJung-uk Kim     mlen = HMAC_size(hctx);
1412e71b7053SJung-uk Kim     if (mlen == 0) {
1413e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1414e71b7053SJung-uk Kim         goto end;
1415aeb5019cSJung-uk Kim     }
1416aeb5019cSJung-uk Kim 
1417e71b7053SJung-uk Kim     /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1418e71b7053SJung-uk Kim     if (eticklen <=
1419e71b7053SJung-uk Kim         TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1420e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1421e71b7053SJung-uk Kim         goto end;
1422e71b7053SJung-uk Kim     }
1423db522d3aSSimon L. B. Nielsen     eticklen -= mlen;
1424db522d3aSSimon L. B. Nielsen     /* Check HMAC of encrypted ticket */
1425e71b7053SJung-uk Kim     if (HMAC_Update(hctx, etick, eticklen) <= 0
1426e71b7053SJung-uk Kim         || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
1427e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1428e71b7053SJung-uk Kim         goto end;
142980815a77SJung-uk Kim     }
1430e71b7053SJung-uk Kim 
14316f9291ceSJung-uk Kim     if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
1432e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1433e71b7053SJung-uk Kim         goto end;
1434fa5fddf1SJung-uk Kim     }
1435db522d3aSSimon L. B. Nielsen     /* Attempt to decrypt session data */
1436db522d3aSSimon L. B. Nielsen     /* Move p after IV to start of encrypted ticket, update length */
1437e71b7053SJung-uk Kim     p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1438e71b7053SJung-uk Kim     eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1439db522d3aSSimon L. B. Nielsen     sdec = OPENSSL_malloc(eticklen);
1440e71b7053SJung-uk Kim     if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1441e71b7053SJung-uk Kim                                           (int)eticklen) <= 0) {
1442b8721c16SJung-uk Kim         OPENSSL_free(sdec);
1443e71b7053SJung-uk Kim         ret = SSL_TICKET_FATAL_ERR_OTHER;
1444e71b7053SJung-uk Kim         goto end;
1445db522d3aSSimon L. B. Nielsen     }
1446e71b7053SJung-uk Kim     if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
1447a93cbc2bSJung-uk Kim         OPENSSL_free(sdec);
1448e71b7053SJung-uk Kim         ret = SSL_TICKET_NO_DECRYPT;
1449e71b7053SJung-uk Kim         goto end;
1450a93cbc2bSJung-uk Kim     }
1451e71b7053SJung-uk Kim     slen += declen;
1452db522d3aSSimon L. B. Nielsen     p = sdec;
1453db522d3aSSimon L. B. Nielsen 
1454db522d3aSSimon L. B. Nielsen     sess = d2i_SSL_SESSION(NULL, &p, slen);
1455ed7112f0SJung-uk Kim     slen -= p - sdec;
1456db522d3aSSimon L. B. Nielsen     OPENSSL_free(sdec);
14576f9291ceSJung-uk Kim     if (sess) {
1458ed7112f0SJung-uk Kim         /* Some additional consistency checks */
1459e71b7053SJung-uk Kim         if (slen != 0) {
1460ed7112f0SJung-uk Kim             SSL_SESSION_free(sess);
1461e71b7053SJung-uk Kim             sess = NULL;
1462e71b7053SJung-uk Kim             ret = SSL_TICKET_NO_DECRYPT;
1463e71b7053SJung-uk Kim             goto end;
1464ed7112f0SJung-uk Kim         }
14656f9291ceSJung-uk Kim         /*
14666f9291ceSJung-uk Kim          * The session ID, if non-empty, is used by some clients to detect
14676f9291ceSJung-uk Kim          * that the ticket has been accepted. So we copy it to the session
14686f9291ceSJung-uk Kim          * structure. If it is empty set length to zero as required by
14696f9291ceSJung-uk Kim          * standard.
1470db522d3aSSimon L. B. Nielsen          */
1471e71b7053SJung-uk Kim         if (sesslen) {
1472db522d3aSSimon L. B. Nielsen             memcpy(sess->session_id, sess_id, sesslen);
1473db522d3aSSimon L. B. Nielsen             sess->session_id_length = sesslen;
1474e71b7053SJung-uk Kim         }
14751f13597dSJung-uk Kim         if (renew_ticket)
1476e71b7053SJung-uk Kim             ret = SSL_TICKET_SUCCESS_RENEW;
14771f13597dSJung-uk Kim         else
1478e71b7053SJung-uk Kim             ret = SSL_TICKET_SUCCESS;
1479e71b7053SJung-uk Kim         goto end;
14801f13597dSJung-uk Kim     }
14811f13597dSJung-uk Kim     ERR_clear_error();
14826f9291ceSJung-uk Kim     /*
14836f9291ceSJung-uk Kim      * For session parse failure, indicate that we need to send a new ticket.
14846f9291ceSJung-uk Kim      */
1485e71b7053SJung-uk Kim     ret = SSL_TICKET_NO_DECRYPT;
14861f13597dSJung-uk Kim 
1487e71b7053SJung-uk Kim  end:
1488e71b7053SJung-uk Kim     EVP_CIPHER_CTX_free(ctx);
1489e71b7053SJung-uk Kim     HMAC_CTX_free(hctx);
14901f13597dSJung-uk Kim 
1491e71b7053SJung-uk Kim     /*
1492e71b7053SJung-uk Kim      * If set, the decrypt_ticket_cb() is called unless a fatal error was
1493e71b7053SJung-uk Kim      * detected above. The callback is responsible for checking |ret| before it
1494e71b7053SJung-uk Kim      * performs any action
1495e71b7053SJung-uk Kim      */
1496e71b7053SJung-uk Kim     if (s->session_ctx->decrypt_ticket_cb != NULL
1497e71b7053SJung-uk Kim             && (ret == SSL_TICKET_EMPTY
1498e71b7053SJung-uk Kim                 || ret == SSL_TICKET_NO_DECRYPT
1499e71b7053SJung-uk Kim                 || ret == SSL_TICKET_SUCCESS
1500e71b7053SJung-uk Kim                 || ret == SSL_TICKET_SUCCESS_RENEW)) {
1501e71b7053SJung-uk Kim         size_t keyname_len = eticklen;
1502e71b7053SJung-uk Kim         int retcb;
15031f13597dSJung-uk Kim 
1504e71b7053SJung-uk Kim         if (keyname_len > TLSEXT_KEYNAME_LENGTH)
1505e71b7053SJung-uk Kim             keyname_len = TLSEXT_KEYNAME_LENGTH;
1506e71b7053SJung-uk Kim         retcb = s->session_ctx->decrypt_ticket_cb(s, sess, etick, keyname_len,
1507e71b7053SJung-uk Kim                                                   ret,
1508e71b7053SJung-uk Kim                                                   s->session_ctx->ticket_cb_data);
1509e71b7053SJung-uk Kim         switch (retcb) {
1510e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_ABORT:
1511e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
1512e71b7053SJung-uk Kim             break;
15131f13597dSJung-uk Kim 
1514e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_IGNORE:
1515e71b7053SJung-uk Kim             ret = SSL_TICKET_NONE;
1516e71b7053SJung-uk Kim             SSL_SESSION_free(sess);
1517e71b7053SJung-uk Kim             sess = NULL;
1518e71b7053SJung-uk Kim             break;
15191f13597dSJung-uk Kim 
1520e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_IGNORE_RENEW:
1521e71b7053SJung-uk Kim             if (ret != SSL_TICKET_EMPTY && ret != SSL_TICKET_NO_DECRYPT)
1522e71b7053SJung-uk Kim                 ret = SSL_TICKET_NO_DECRYPT;
1523e71b7053SJung-uk Kim             /* else the value of |ret| will already do the right thing */
1524e71b7053SJung-uk Kim             SSL_SESSION_free(sess);
1525e71b7053SJung-uk Kim             sess = NULL;
1526e71b7053SJung-uk Kim             break;
15276f9291ceSJung-uk Kim 
1528e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_USE:
1529e71b7053SJung-uk Kim         case SSL_TICKET_RETURN_USE_RENEW:
1530e71b7053SJung-uk Kim             if (ret != SSL_TICKET_SUCCESS
1531e71b7053SJung-uk Kim                     && ret != SSL_TICKET_SUCCESS_RENEW)
1532e71b7053SJung-uk Kim                 ret = SSL_TICKET_FATAL_ERR_OTHER;
1533e71b7053SJung-uk Kim             else if (retcb == SSL_TICKET_RETURN_USE)
1534e71b7053SJung-uk Kim                 ret = SSL_TICKET_SUCCESS;
1535e71b7053SJung-uk Kim             else
1536e71b7053SJung-uk Kim                 ret = SSL_TICKET_SUCCESS_RENEW;
1537e71b7053SJung-uk Kim             break;
15381f13597dSJung-uk Kim 
15391f13597dSJung-uk Kim         default:
1540e71b7053SJung-uk Kim             ret = SSL_TICKET_FATAL_ERR_OTHER;
15411f13597dSJung-uk Kim         }
15421f13597dSJung-uk Kim     }
15431f13597dSJung-uk Kim 
1544e71b7053SJung-uk Kim     if (s->ext.session_secret_cb == NULL || SSL_IS_TLS13(s)) {
1545e71b7053SJung-uk Kim         switch (ret) {
1546e71b7053SJung-uk Kim         case SSL_TICKET_NO_DECRYPT:
1547e71b7053SJung-uk Kim         case SSL_TICKET_SUCCESS_RENEW:
1548e71b7053SJung-uk Kim         case SSL_TICKET_EMPTY:
1549e71b7053SJung-uk Kim             s->ext.ticket_expected = 1;
1550e71b7053SJung-uk Kim         }
1551e71b7053SJung-uk Kim     }
1552e71b7053SJung-uk Kim 
1553e71b7053SJung-uk Kim     *psess = sess;
1554e71b7053SJung-uk Kim 
1555e71b7053SJung-uk Kim     return ret;
1556e71b7053SJung-uk Kim }
1557e71b7053SJung-uk Kim 
1558e71b7053SJung-uk Kim /* Check to see if a signature algorithm is allowed */
1559e71b7053SJung-uk Kim static int tls12_sigalg_allowed(SSL *s, int op, const SIGALG_LOOKUP *lu)
15607bded2dbSJung-uk Kim {
1561e71b7053SJung-uk Kim     unsigned char sigalgstr[2];
1562e71b7053SJung-uk Kim     int secbits;
1563e71b7053SJung-uk Kim 
1564e71b7053SJung-uk Kim     /* See if sigalgs is recognised and if hash is enabled */
1565e71b7053SJung-uk Kim     if (!tls1_lookup_md(lu, NULL))
1566e71b7053SJung-uk Kim         return 0;
1567e71b7053SJung-uk Kim     /* DSA is not allowed in TLS 1.3 */
1568e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s) && lu->sig == EVP_PKEY_DSA)
1569e71b7053SJung-uk Kim         return 0;
1570e71b7053SJung-uk Kim     /* TODO(OpenSSL1.2) fully axe DSA/etc. in ClientHello per TLS 1.3 spec */
1571e71b7053SJung-uk Kim     if (!s->server && !SSL_IS_DTLS(s) && s->s3->tmp.min_ver >= TLS1_3_VERSION
1572e71b7053SJung-uk Kim         && (lu->sig == EVP_PKEY_DSA || lu->hash_idx == SSL_MD_SHA1_IDX
1573e71b7053SJung-uk Kim             || lu->hash_idx == SSL_MD_MD5_IDX
1574e71b7053SJung-uk Kim             || lu->hash_idx == SSL_MD_SHA224_IDX))
1575e71b7053SJung-uk Kim         return 0;
1576e71b7053SJung-uk Kim 
1577e71b7053SJung-uk Kim     /* See if public key algorithm allowed */
1578e71b7053SJung-uk Kim     if (ssl_cert_is_disabled(lu->sig_idx))
1579e71b7053SJung-uk Kim         return 0;
1580e71b7053SJung-uk Kim 
1581e71b7053SJung-uk Kim     if (lu->sig == NID_id_GostR3410_2012_256
1582e71b7053SJung-uk Kim             || lu->sig == NID_id_GostR3410_2012_512
1583e71b7053SJung-uk Kim             || lu->sig == NID_id_GostR3410_2001) {
1584e71b7053SJung-uk Kim         /* We never allow GOST sig algs on the server with TLSv1.3 */
1585e71b7053SJung-uk Kim         if (s->server && SSL_IS_TLS13(s))
1586e71b7053SJung-uk Kim             return 0;
1587e71b7053SJung-uk Kim         if (!s->server
1588e71b7053SJung-uk Kim                 && s->method->version == TLS_ANY_VERSION
1589e71b7053SJung-uk Kim                 && s->s3->tmp.max_ver >= TLS1_3_VERSION) {
1590e71b7053SJung-uk Kim             int i, num;
1591e71b7053SJung-uk Kim             STACK_OF(SSL_CIPHER) *sk;
1592e71b7053SJung-uk Kim 
1593e71b7053SJung-uk Kim             /*
1594e71b7053SJung-uk Kim              * We're a client that could negotiate TLSv1.3. We only allow GOST
1595e71b7053SJung-uk Kim              * sig algs if we could negotiate TLSv1.2 or below and we have GOST
1596e71b7053SJung-uk Kim              * ciphersuites enabled.
1597e71b7053SJung-uk Kim              */
1598e71b7053SJung-uk Kim 
1599e71b7053SJung-uk Kim             if (s->s3->tmp.min_ver >= TLS1_3_VERSION)
1600e71b7053SJung-uk Kim                 return 0;
1601e71b7053SJung-uk Kim 
1602e71b7053SJung-uk Kim             sk = SSL_get_ciphers(s);
1603e71b7053SJung-uk Kim             num = sk != NULL ? sk_SSL_CIPHER_num(sk) : 0;
1604e71b7053SJung-uk Kim             for (i = 0; i < num; i++) {
1605e71b7053SJung-uk Kim                 const SSL_CIPHER *c;
1606e71b7053SJung-uk Kim 
1607e71b7053SJung-uk Kim                 c = sk_SSL_CIPHER_value(sk, i);
1608e71b7053SJung-uk Kim                 /* Skip disabled ciphers */
1609e71b7053SJung-uk Kim                 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0))
1610e71b7053SJung-uk Kim                     continue;
1611e71b7053SJung-uk Kim 
1612e71b7053SJung-uk Kim                 if ((c->algorithm_mkey & SSL_kGOST) != 0)
1613e71b7053SJung-uk Kim                     break;
16147bded2dbSJung-uk Kim             }
1615e71b7053SJung-uk Kim             if (i == num)
1616e71b7053SJung-uk Kim                 return 0;
1617e71b7053SJung-uk Kim         }
16187bded2dbSJung-uk Kim     }
16197bded2dbSJung-uk Kim 
1620e71b7053SJung-uk Kim     if (lu->hash == NID_undef)
1621e71b7053SJung-uk Kim         return 1;
1622e71b7053SJung-uk Kim     /* Security bits: half digest bits */
1623e71b7053SJung-uk Kim     secbits = EVP_MD_size(ssl_md(lu->hash_idx)) * 4;
1624e71b7053SJung-uk Kim     /* Finally see if security callback allows it */
1625e71b7053SJung-uk Kim     sigalgstr[0] = (lu->sigalg >> 8) & 0xff;
1626e71b7053SJung-uk Kim     sigalgstr[1] = lu->sigalg & 0xff;
1627e71b7053SJung-uk Kim     return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
1628e71b7053SJung-uk Kim }
1629e71b7053SJung-uk Kim 
1630e71b7053SJung-uk Kim /*
1631e71b7053SJung-uk Kim  * Get a mask of disabled public key algorithms based on supported signature
1632e71b7053SJung-uk Kim  * algorithms. For example if no signature algorithm supports RSA then RSA is
1633e71b7053SJung-uk Kim  * disabled.
1634e71b7053SJung-uk Kim  */
1635e71b7053SJung-uk Kim 
1636e71b7053SJung-uk Kim void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
16377bded2dbSJung-uk Kim {
1638e71b7053SJung-uk Kim     const uint16_t *sigalgs;
1639e71b7053SJung-uk Kim     size_t i, sigalgslen;
1640e71b7053SJung-uk Kim     uint32_t disabled_mask = SSL_aRSA | SSL_aDSS | SSL_aECDSA;
1641e71b7053SJung-uk Kim     /*
1642e71b7053SJung-uk Kim      * Go through all signature algorithms seeing if we support any
1643e71b7053SJung-uk Kim      * in disabled_mask.
1644e71b7053SJung-uk Kim      */
1645e71b7053SJung-uk Kim     sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
1646e71b7053SJung-uk Kim     for (i = 0; i < sigalgslen; i++, sigalgs++) {
1647e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*sigalgs);
1648e71b7053SJung-uk Kim         const SSL_CERT_LOOKUP *clu;
1649e71b7053SJung-uk Kim 
1650e71b7053SJung-uk Kim         if (lu == NULL)
1651e71b7053SJung-uk Kim             continue;
1652e71b7053SJung-uk Kim 
1653e71b7053SJung-uk Kim         clu = ssl_cert_lookup_by_idx(lu->sig_idx);
1654e71b7053SJung-uk Kim 	if (clu == NULL)
1655e71b7053SJung-uk Kim 		continue;
1656e71b7053SJung-uk Kim 
1657e71b7053SJung-uk Kim         /* If algorithm is disabled see if we can enable it */
1658e71b7053SJung-uk Kim         if ((clu->amask & disabled_mask) != 0
1659e71b7053SJung-uk Kim                 && tls12_sigalg_allowed(s, op, lu))
1660e71b7053SJung-uk Kim             disabled_mask &= ~clu->amask;
16617bded2dbSJung-uk Kim     }
1662e71b7053SJung-uk Kim     *pmask_a |= disabled_mask;
16637bded2dbSJung-uk Kim }
1664e71b7053SJung-uk Kim 
1665e71b7053SJung-uk Kim int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
1666e71b7053SJung-uk Kim                        const uint16_t *psig, size_t psiglen)
1667e71b7053SJung-uk Kim {
1668e71b7053SJung-uk Kim     size_t i;
1669e71b7053SJung-uk Kim     int rv = 0;
1670e71b7053SJung-uk Kim 
1671e71b7053SJung-uk Kim     for (i = 0; i < psiglen; i++, psig++) {
1672e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*psig);
1673e71b7053SJung-uk Kim 
1674e71b7053SJung-uk Kim         if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
1675e71b7053SJung-uk Kim             continue;
1676e71b7053SJung-uk Kim         if (!WPACKET_put_bytes_u16(pkt, *psig))
1677e71b7053SJung-uk Kim             return 0;
1678e71b7053SJung-uk Kim         /*
1679e71b7053SJung-uk Kim          * If TLS 1.3 must have at least one valid TLS 1.3 message
1680e71b7053SJung-uk Kim          * signing algorithm: i.e. neither RSA nor SHA1/SHA224
1681e71b7053SJung-uk Kim          */
1682e71b7053SJung-uk Kim         if (rv == 0 && (!SSL_IS_TLS13(s)
1683e71b7053SJung-uk Kim             || (lu->sig != EVP_PKEY_RSA
1684e71b7053SJung-uk Kim                 && lu->hash != NID_sha1
1685e71b7053SJung-uk Kim                 && lu->hash != NID_sha224)))
1686e71b7053SJung-uk Kim             rv = 1;
16877bded2dbSJung-uk Kim     }
1688e71b7053SJung-uk Kim     if (rv == 0)
1689e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS12_COPY_SIGALGS, SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
1690e71b7053SJung-uk Kim     return rv;
16917bded2dbSJung-uk Kim }
16927bded2dbSJung-uk Kim 
16937bded2dbSJung-uk Kim /* Given preference and allowed sigalgs set shared sigalgs */
1694e71b7053SJung-uk Kim static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
1695e71b7053SJung-uk Kim                                    const uint16_t *pref, size_t preflen,
1696e71b7053SJung-uk Kim                                    const uint16_t *allow, size_t allowlen)
16977bded2dbSJung-uk Kim {
1698e71b7053SJung-uk Kim     const uint16_t *ptmp, *atmp;
16997bded2dbSJung-uk Kim     size_t i, j, nmatch = 0;
1700e71b7053SJung-uk Kim     for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
1701e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*ptmp);
1702e71b7053SJung-uk Kim 
17037bded2dbSJung-uk Kim         /* Skip disabled hashes or signature algorithms */
1704e71b7053SJung-uk Kim         if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, lu))
17057bded2dbSJung-uk Kim             continue;
1706e71b7053SJung-uk Kim         for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
1707e71b7053SJung-uk Kim             if (*ptmp == *atmp) {
17087bded2dbSJung-uk Kim                 nmatch++;
1709e71b7053SJung-uk Kim                 if (shsig)
1710e71b7053SJung-uk Kim                     *shsig++ = lu;
17117bded2dbSJung-uk Kim                 break;
17127bded2dbSJung-uk Kim             }
17137bded2dbSJung-uk Kim         }
17147bded2dbSJung-uk Kim     }
17157bded2dbSJung-uk Kim     return nmatch;
17167bded2dbSJung-uk Kim }
17177bded2dbSJung-uk Kim 
17187bded2dbSJung-uk Kim /* Set shared signature algorithms for SSL structures */
17197bded2dbSJung-uk Kim static int tls1_set_shared_sigalgs(SSL *s)
17207bded2dbSJung-uk Kim {
1721e71b7053SJung-uk Kim     const uint16_t *pref, *allow, *conf;
17227bded2dbSJung-uk Kim     size_t preflen, allowlen, conflen;
17237bded2dbSJung-uk Kim     size_t nmatch;
1724e71b7053SJung-uk Kim     const SIGALG_LOOKUP **salgs = NULL;
17257bded2dbSJung-uk Kim     CERT *c = s->cert;
17267bded2dbSJung-uk Kim     unsigned int is_suiteb = tls1_suiteb(s);
1727e71b7053SJung-uk Kim 
1728*da327cd2SJung-uk Kim     OPENSSL_free(s->shared_sigalgs);
1729*da327cd2SJung-uk Kim     s->shared_sigalgs = NULL;
1730*da327cd2SJung-uk Kim     s->shared_sigalgslen = 0;
17317bded2dbSJung-uk Kim     /* If client use client signature algorithms if not NULL */
17327bded2dbSJung-uk Kim     if (!s->server && c->client_sigalgs && !is_suiteb) {
17337bded2dbSJung-uk Kim         conf = c->client_sigalgs;
17347bded2dbSJung-uk Kim         conflen = c->client_sigalgslen;
17357bded2dbSJung-uk Kim     } else if (c->conf_sigalgs && !is_suiteb) {
17367bded2dbSJung-uk Kim         conf = c->conf_sigalgs;
17377bded2dbSJung-uk Kim         conflen = c->conf_sigalgslen;
17387bded2dbSJung-uk Kim     } else
1739ed7112f0SJung-uk Kim         conflen = tls12_get_psigalgs(s, 0, &conf);
17407bded2dbSJung-uk Kim     if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
17417bded2dbSJung-uk Kim         pref = conf;
17427bded2dbSJung-uk Kim         preflen = conflen;
1743e71b7053SJung-uk Kim         allow = s->s3->tmp.peer_sigalgs;
1744e71b7053SJung-uk Kim         allowlen = s->s3->tmp.peer_sigalgslen;
17457bded2dbSJung-uk Kim     } else {
17467bded2dbSJung-uk Kim         allow = conf;
17477bded2dbSJung-uk Kim         allowlen = conflen;
1748e71b7053SJung-uk Kim         pref = s->s3->tmp.peer_sigalgs;
1749e71b7053SJung-uk Kim         preflen = s->s3->tmp.peer_sigalgslen;
17507bded2dbSJung-uk Kim     }
1751e71b7053SJung-uk Kim     nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
17527bded2dbSJung-uk Kim     if (nmatch) {
1753e71b7053SJung-uk Kim         if ((salgs = OPENSSL_malloc(nmatch * sizeof(*salgs))) == NULL) {
1754e71b7053SJung-uk Kim             SSLerr(SSL_F_TLS1_SET_SHARED_SIGALGS, ERR_R_MALLOC_FAILURE);
17557bded2dbSJung-uk Kim             return 0;
1756e71b7053SJung-uk Kim         }
1757e71b7053SJung-uk Kim         nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
17587bded2dbSJung-uk Kim     } else {
17597bded2dbSJung-uk Kim         salgs = NULL;
17607bded2dbSJung-uk Kim     }
1761*da327cd2SJung-uk Kim     s->shared_sigalgs = salgs;
1762*da327cd2SJung-uk Kim     s->shared_sigalgslen = nmatch;
17637bded2dbSJung-uk Kim     return 1;
17647bded2dbSJung-uk Kim }
17657bded2dbSJung-uk Kim 
1766e71b7053SJung-uk Kim int tls1_save_u16(PACKET *pkt, uint16_t **pdest, size_t *pdestlen)
17671f13597dSJung-uk Kim {
1768e71b7053SJung-uk Kim     unsigned int stmp;
1769e71b7053SJung-uk Kim     size_t size, i;
1770e71b7053SJung-uk Kim     uint16_t *buf;
1771e71b7053SJung-uk Kim 
1772e71b7053SJung-uk Kim     size = PACKET_remaining(pkt);
1773e71b7053SJung-uk Kim 
1774e71b7053SJung-uk Kim     /* Invalid data length */
1775e71b7053SJung-uk Kim     if (size == 0 || (size & 1) != 0)
1776e71b7053SJung-uk Kim         return 0;
1777e71b7053SJung-uk Kim 
1778e71b7053SJung-uk Kim     size >>= 1;
1779e71b7053SJung-uk Kim 
1780e71b7053SJung-uk Kim     if ((buf = OPENSSL_malloc(size * sizeof(*buf))) == NULL)  {
1781e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SAVE_U16, ERR_R_MALLOC_FAILURE);
1782e71b7053SJung-uk Kim         return 0;
1783e71b7053SJung-uk Kim     }
1784e71b7053SJung-uk Kim     for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
1785e71b7053SJung-uk Kim         buf[i] = stmp;
1786e71b7053SJung-uk Kim 
1787e71b7053SJung-uk Kim     if (i != size) {
1788e71b7053SJung-uk Kim         OPENSSL_free(buf);
1789e71b7053SJung-uk Kim         return 0;
1790e71b7053SJung-uk Kim     }
1791e71b7053SJung-uk Kim 
1792e71b7053SJung-uk Kim     OPENSSL_free(*pdest);
1793e71b7053SJung-uk Kim     *pdest = buf;
1794e71b7053SJung-uk Kim     *pdestlen = size;
1795e71b7053SJung-uk Kim 
1796e71b7053SJung-uk Kim     return 1;
1797e71b7053SJung-uk Kim }
1798e71b7053SJung-uk Kim 
1799e71b7053SJung-uk Kim int tls1_save_sigalgs(SSL *s, PACKET *pkt, int cert)
1800e71b7053SJung-uk Kim {
18017bded2dbSJung-uk Kim     /* Extension ignored for inappropriate versions */
18027bded2dbSJung-uk Kim     if (!SSL_USE_SIGALGS(s))
18031f13597dSJung-uk Kim         return 1;
18041f13597dSJung-uk Kim     /* Should never happen */
1805e71b7053SJung-uk Kim     if (s->cert == NULL)
18061f13597dSJung-uk Kim         return 0;
18071f13597dSJung-uk Kim 
1808e71b7053SJung-uk Kim     if (cert)
1809e71b7053SJung-uk Kim         return tls1_save_u16(pkt, &s->s3->tmp.peer_cert_sigalgs,
1810e71b7053SJung-uk Kim                              &s->s3->tmp.peer_cert_sigalgslen);
1811e71b7053SJung-uk Kim     else
1812e71b7053SJung-uk Kim         return tls1_save_u16(pkt, &s->s3->tmp.peer_sigalgs,
1813e71b7053SJung-uk Kim                              &s->s3->tmp.peer_sigalgslen);
1814e71b7053SJung-uk Kim 
18151f13597dSJung-uk Kim }
18161f13597dSJung-uk Kim 
1817e71b7053SJung-uk Kim /* Set preferred digest for each key type */
1818e71b7053SJung-uk Kim 
18197bded2dbSJung-uk Kim int tls1_process_sigalgs(SSL *s)
18207bded2dbSJung-uk Kim {
18217bded2dbSJung-uk Kim     size_t i;
1822e71b7053SJung-uk Kim     uint32_t *pvalid = s->s3->tmp.valid_flags;
1823e71b7053SJung-uk Kim 
18247bded2dbSJung-uk Kim     if (!tls1_set_shared_sigalgs(s))
18257bded2dbSJung-uk Kim         return 0;
18267bded2dbSJung-uk Kim 
1827e71b7053SJung-uk Kim     for (i = 0; i < SSL_PKEY_NUM; i++)
1828e71b7053SJung-uk Kim         pvalid[i] = 0;
18297bded2dbSJung-uk Kim 
1830*da327cd2SJung-uk Kim     for (i = 0; i < s->shared_sigalgslen; i++) {
1831*da327cd2SJung-uk Kim         const SIGALG_LOOKUP *sigptr = s->shared_sigalgs[i];
1832e71b7053SJung-uk Kim         int idx = sigptr->sig_idx;
18331f13597dSJung-uk Kim 
1834e71b7053SJung-uk Kim         /* Ignore PKCS1 based sig algs in TLSv1.3 */
1835e71b7053SJung-uk Kim         if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
1836e71b7053SJung-uk Kim             continue;
1837e71b7053SJung-uk Kim         /* If not disabled indicate we can explicitly sign */
1838e71b7053SJung-uk Kim         if (pvalid[idx] == 0 && !ssl_cert_is_disabled(idx))
1839e71b7053SJung-uk Kim             pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
18407bded2dbSJung-uk Kim     }
18411f13597dSJung-uk Kim     return 1;
18421f13597dSJung-uk Kim }
18431f13597dSJung-uk Kim 
18447bded2dbSJung-uk Kim int SSL_get_sigalgs(SSL *s, int idx,
18457bded2dbSJung-uk Kim                     int *psign, int *phash, int *psignhash,
18467bded2dbSJung-uk Kim                     unsigned char *rsig, unsigned char *rhash)
18477bded2dbSJung-uk Kim {
1848e71b7053SJung-uk Kim     uint16_t *psig = s->s3->tmp.peer_sigalgs;
1849e71b7053SJung-uk Kim     size_t numsigalgs = s->s3->tmp.peer_sigalgslen;
1850e71b7053SJung-uk Kim     if (psig == NULL || numsigalgs > INT_MAX)
18517bded2dbSJung-uk Kim         return 0;
18527bded2dbSJung-uk Kim     if (idx >= 0) {
1853e71b7053SJung-uk Kim         const SIGALG_LOOKUP *lu;
1854e71b7053SJung-uk Kim 
1855e71b7053SJung-uk Kim         if (idx >= (int)numsigalgs)
18567bded2dbSJung-uk Kim             return 0;
18577bded2dbSJung-uk Kim         psig += idx;
1858e71b7053SJung-uk Kim         if (rhash != NULL)
1859e71b7053SJung-uk Kim             *rhash = (unsigned char)((*psig >> 8) & 0xff);
1860e71b7053SJung-uk Kim         if (rsig != NULL)
1861e71b7053SJung-uk Kim             *rsig = (unsigned char)(*psig & 0xff);
1862e71b7053SJung-uk Kim         lu = tls1_lookup_sigalg(*psig);
1863e71b7053SJung-uk Kim         if (psign != NULL)
1864e71b7053SJung-uk Kim             *psign = lu != NULL ? lu->sig : NID_undef;
1865e71b7053SJung-uk Kim         if (phash != NULL)
1866e71b7053SJung-uk Kim             *phash = lu != NULL ? lu->hash : NID_undef;
1867e71b7053SJung-uk Kim         if (psignhash != NULL)
1868e71b7053SJung-uk Kim             *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
18697bded2dbSJung-uk Kim     }
1870e71b7053SJung-uk Kim     return (int)numsigalgs;
18717bded2dbSJung-uk Kim }
18727bded2dbSJung-uk Kim 
18737bded2dbSJung-uk Kim int SSL_get_shared_sigalgs(SSL *s, int idx,
18747bded2dbSJung-uk Kim                            int *psign, int *phash, int *psignhash,
18757bded2dbSJung-uk Kim                            unsigned char *rsig, unsigned char *rhash)
18767bded2dbSJung-uk Kim {
1877e71b7053SJung-uk Kim     const SIGALG_LOOKUP *shsigalgs;
1878*da327cd2SJung-uk Kim     if (s->shared_sigalgs == NULL
1879e71b7053SJung-uk Kim         || idx < 0
1880*da327cd2SJung-uk Kim         || idx >= (int)s->shared_sigalgslen
1881*da327cd2SJung-uk Kim         || s->shared_sigalgslen > INT_MAX)
18827bded2dbSJung-uk Kim         return 0;
1883*da327cd2SJung-uk Kim     shsigalgs = s->shared_sigalgs[idx];
1884e71b7053SJung-uk Kim     if (phash != NULL)
1885e71b7053SJung-uk Kim         *phash = shsigalgs->hash;
1886e71b7053SJung-uk Kim     if (psign != NULL)
1887e71b7053SJung-uk Kim         *psign = shsigalgs->sig;
1888e71b7053SJung-uk Kim     if (psignhash != NULL)
1889e71b7053SJung-uk Kim         *psignhash = shsigalgs->sigandhash;
1890e71b7053SJung-uk Kim     if (rsig != NULL)
1891e71b7053SJung-uk Kim         *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
1892e71b7053SJung-uk Kim     if (rhash != NULL)
1893e71b7053SJung-uk Kim         *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
1894*da327cd2SJung-uk Kim     return (int)s->shared_sigalgslen;
18957bded2dbSJung-uk Kim }
18961f13597dSJung-uk Kim 
1897e71b7053SJung-uk Kim /* Maximum possible number of unique entries in sigalgs array */
1898e71b7053SJung-uk Kim #define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
18997bded2dbSJung-uk Kim 
19007bded2dbSJung-uk Kim typedef struct {
19017bded2dbSJung-uk Kim     size_t sigalgcnt;
1902e71b7053SJung-uk Kim     /* TLSEXT_SIGALG_XXX values */
1903e71b7053SJung-uk Kim     uint16_t sigalgs[TLS_MAX_SIGALGCNT];
19047bded2dbSJung-uk Kim } sig_cb_st;
19057bded2dbSJung-uk Kim 
1906e71b7053SJung-uk Kim static void get_sigorhash(int *psig, int *phash, const char *str)
1907e71b7053SJung-uk Kim {
1908e71b7053SJung-uk Kim     if (strcmp(str, "RSA") == 0) {
1909e71b7053SJung-uk Kim         *psig = EVP_PKEY_RSA;
1910e71b7053SJung-uk Kim     } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
1911e71b7053SJung-uk Kim         *psig = EVP_PKEY_RSA_PSS;
1912e71b7053SJung-uk Kim     } else if (strcmp(str, "DSA") == 0) {
1913e71b7053SJung-uk Kim         *psig = EVP_PKEY_DSA;
1914e71b7053SJung-uk Kim     } else if (strcmp(str, "ECDSA") == 0) {
1915e71b7053SJung-uk Kim         *psig = EVP_PKEY_EC;
1916e71b7053SJung-uk Kim     } else {
1917e71b7053SJung-uk Kim         *phash = OBJ_sn2nid(str);
1918e71b7053SJung-uk Kim         if (*phash == NID_undef)
1919e71b7053SJung-uk Kim             *phash = OBJ_ln2nid(str);
1920e71b7053SJung-uk Kim     }
1921e71b7053SJung-uk Kim }
1922e71b7053SJung-uk Kim /* Maximum length of a signature algorithm string component */
1923e71b7053SJung-uk Kim #define TLS_MAX_SIGSTRING_LEN   40
1924e71b7053SJung-uk Kim 
19257bded2dbSJung-uk Kim static int sig_cb(const char *elem, int len, void *arg)
19267bded2dbSJung-uk Kim {
19277bded2dbSJung-uk Kim     sig_cb_st *sarg = arg;
19287bded2dbSJung-uk Kim     size_t i;
1929e71b7053SJung-uk Kim     const SIGALG_LOOKUP *s;
1930e71b7053SJung-uk Kim     char etmp[TLS_MAX_SIGSTRING_LEN], *p;
1931e71b7053SJung-uk Kim     int sig_alg = NID_undef, hash_alg = NID_undef;
19327bded2dbSJung-uk Kim     if (elem == NULL)
19337bded2dbSJung-uk Kim         return 0;
1934e71b7053SJung-uk Kim     if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
19357bded2dbSJung-uk Kim         return 0;
19367bded2dbSJung-uk Kim     if (len > (int)(sizeof(etmp) - 1))
19377bded2dbSJung-uk Kim         return 0;
19387bded2dbSJung-uk Kim     memcpy(etmp, elem, len);
19397bded2dbSJung-uk Kim     etmp[len] = 0;
19407bded2dbSJung-uk Kim     p = strchr(etmp, '+');
1941e71b7053SJung-uk Kim     /*
1942e71b7053SJung-uk Kim      * We only allow SignatureSchemes listed in the sigalg_lookup_tbl;
1943e71b7053SJung-uk Kim      * if there's no '+' in the provided name, look for the new-style combined
1944e71b7053SJung-uk Kim      * name.  If not, match both sig+hash to find the needed SIGALG_LOOKUP.
1945e71b7053SJung-uk Kim      * Just sig+hash is not unique since TLS 1.3 adds rsa_pss_pss_* and
1946e71b7053SJung-uk Kim      * rsa_pss_rsae_* that differ only by public key OID; in such cases
1947e71b7053SJung-uk Kim      * we will pick the _rsae_ variant, by virtue of them appearing earlier
1948e71b7053SJung-uk Kim      * in the table.
1949e71b7053SJung-uk Kim      */
1950e71b7053SJung-uk Kim     if (p == NULL) {
1951e71b7053SJung-uk Kim         for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1952e71b7053SJung-uk Kim              i++, s++) {
1953e71b7053SJung-uk Kim             if (s->name != NULL && strcmp(etmp, s->name) == 0) {
1954e71b7053SJung-uk Kim                 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
1955e71b7053SJung-uk Kim                 break;
1956e71b7053SJung-uk Kim             }
1957e71b7053SJung-uk Kim         }
1958e71b7053SJung-uk Kim         if (i == OSSL_NELEM(sigalg_lookup_tbl))
19597bded2dbSJung-uk Kim             return 0;
1960e71b7053SJung-uk Kim     } else {
19617bded2dbSJung-uk Kim         *p = 0;
19627bded2dbSJung-uk Kim         p++;
1963e71b7053SJung-uk Kim         if (*p == 0)
19647bded2dbSJung-uk Kim             return 0;
1965e71b7053SJung-uk Kim         get_sigorhash(&sig_alg, &hash_alg, etmp);
1966e71b7053SJung-uk Kim         get_sigorhash(&sig_alg, &hash_alg, p);
1967e71b7053SJung-uk Kim         if (sig_alg == NID_undef || hash_alg == NID_undef)
19687bded2dbSJung-uk Kim             return 0;
1969e71b7053SJung-uk Kim         for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1970e71b7053SJung-uk Kim              i++, s++) {
1971e71b7053SJung-uk Kim             if (s->hash == hash_alg && s->sig == sig_alg) {
1972e71b7053SJung-uk Kim                 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
1973e71b7053SJung-uk Kim                 break;
1974e71b7053SJung-uk Kim             }
1975e71b7053SJung-uk Kim         }
1976e71b7053SJung-uk Kim         if (i == OSSL_NELEM(sigalg_lookup_tbl))
19777bded2dbSJung-uk Kim             return 0;
19787bded2dbSJung-uk Kim     }
1979e71b7053SJung-uk Kim 
1980e71b7053SJung-uk Kim     /* Reject duplicates */
1981e71b7053SJung-uk Kim     for (i = 0; i < sarg->sigalgcnt - 1; i++) {
1982e71b7053SJung-uk Kim         if (sarg->sigalgs[i] == sarg->sigalgs[sarg->sigalgcnt - 1]) {
1983e71b7053SJung-uk Kim             sarg->sigalgcnt--;
1984e71b7053SJung-uk Kim             return 0;
1985e71b7053SJung-uk Kim         }
1986e71b7053SJung-uk Kim     }
19877bded2dbSJung-uk Kim     return 1;
19887bded2dbSJung-uk Kim }
19897bded2dbSJung-uk Kim 
19907bded2dbSJung-uk Kim /*
1991e71b7053SJung-uk Kim  * Set supported signature algorithms based on a colon separated list of the
19927bded2dbSJung-uk Kim  * form sig+hash e.g. RSA+SHA512:DSA+SHA512
19937bded2dbSJung-uk Kim  */
19947bded2dbSJung-uk Kim int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
19957bded2dbSJung-uk Kim {
19967bded2dbSJung-uk Kim     sig_cb_st sig;
19977bded2dbSJung-uk Kim     sig.sigalgcnt = 0;
19987bded2dbSJung-uk Kim     if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
19997bded2dbSJung-uk Kim         return 0;
20007bded2dbSJung-uk Kim     if (c == NULL)
20017bded2dbSJung-uk Kim         return 1;
2002e71b7053SJung-uk Kim     return tls1_set_raw_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
20037bded2dbSJung-uk Kim }
20047bded2dbSJung-uk Kim 
2005e71b7053SJung-uk Kim int tls1_set_raw_sigalgs(CERT *c, const uint16_t *psigs, size_t salglen,
20067bded2dbSJung-uk Kim                      int client)
20077bded2dbSJung-uk Kim {
2008e71b7053SJung-uk Kim     uint16_t *sigalgs;
20097bded2dbSJung-uk Kim 
2010e71b7053SJung-uk Kim     if ((sigalgs = OPENSSL_malloc(salglen * sizeof(*sigalgs))) == NULL) {
2011e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_RAW_SIGALGS, ERR_R_MALLOC_FAILURE);
2012e71b7053SJung-uk Kim         return 0;
20137bded2dbSJung-uk Kim     }
2014e71b7053SJung-uk Kim     memcpy(sigalgs, psigs, salglen * sizeof(*sigalgs));
20157bded2dbSJung-uk Kim 
20167bded2dbSJung-uk Kim     if (client) {
20177bded2dbSJung-uk Kim         OPENSSL_free(c->client_sigalgs);
20187bded2dbSJung-uk Kim         c->client_sigalgs = sigalgs;
20197bded2dbSJung-uk Kim         c->client_sigalgslen = salglen;
20207bded2dbSJung-uk Kim     } else {
20217bded2dbSJung-uk Kim         OPENSSL_free(c->conf_sigalgs);
20227bded2dbSJung-uk Kim         c->conf_sigalgs = sigalgs;
20237bded2dbSJung-uk Kim         c->conf_sigalgslen = salglen;
20247bded2dbSJung-uk Kim     }
20257bded2dbSJung-uk Kim 
20267bded2dbSJung-uk Kim     return 1;
2027e71b7053SJung-uk Kim }
2028e71b7053SJung-uk Kim 
2029e71b7053SJung-uk Kim int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
2030e71b7053SJung-uk Kim {
2031e71b7053SJung-uk Kim     uint16_t *sigalgs, *sptr;
2032e71b7053SJung-uk Kim     size_t i;
2033e71b7053SJung-uk Kim 
2034e71b7053SJung-uk Kim     if (salglen & 1)
2035e71b7053SJung-uk Kim         return 0;
2036e71b7053SJung-uk Kim     if ((sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs))) == NULL) {
2037e71b7053SJung-uk Kim         SSLerr(SSL_F_TLS1_SET_SIGALGS, ERR_R_MALLOC_FAILURE);
2038e71b7053SJung-uk Kim         return 0;
2039e71b7053SJung-uk Kim     }
2040e71b7053SJung-uk Kim     for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
2041e71b7053SJung-uk Kim         size_t j;
2042e71b7053SJung-uk Kim         const SIGALG_LOOKUP *curr;
2043e71b7053SJung-uk Kim         int md_id = *psig_nids++;
2044e71b7053SJung-uk Kim         int sig_id = *psig_nids++;
2045e71b7053SJung-uk Kim 
2046e71b7053SJung-uk Kim         for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
2047e71b7053SJung-uk Kim              j++, curr++) {
2048e71b7053SJung-uk Kim             if (curr->hash == md_id && curr->sig == sig_id) {
2049e71b7053SJung-uk Kim                 *sptr++ = curr->sigalg;
2050e71b7053SJung-uk Kim                 break;
2051e71b7053SJung-uk Kim             }
2052e71b7053SJung-uk Kim         }
2053e71b7053SJung-uk Kim 
2054e71b7053SJung-uk Kim         if (j == OSSL_NELEM(sigalg_lookup_tbl))
2055e71b7053SJung-uk Kim             goto err;
2056e71b7053SJung-uk Kim     }
2057e71b7053SJung-uk Kim 
2058e71b7053SJung-uk Kim     if (client) {
2059e71b7053SJung-uk Kim         OPENSSL_free(c->client_sigalgs);
2060e71b7053SJung-uk Kim         c->client_sigalgs = sigalgs;
2061e71b7053SJung-uk Kim         c->client_sigalgslen = salglen / 2;
2062e71b7053SJung-uk Kim     } else {
2063e71b7053SJung-uk Kim         OPENSSL_free(c->conf_sigalgs);
2064e71b7053SJung-uk Kim         c->conf_sigalgs = sigalgs;
2065e71b7053SJung-uk Kim         c->conf_sigalgslen = salglen / 2;
2066e71b7053SJung-uk Kim     }
2067e71b7053SJung-uk Kim 
2068e71b7053SJung-uk Kim     return 1;
20697bded2dbSJung-uk Kim 
20707bded2dbSJung-uk Kim  err:
20717bded2dbSJung-uk Kim     OPENSSL_free(sigalgs);
20727bded2dbSJung-uk Kim     return 0;
20737bded2dbSJung-uk Kim }
20747bded2dbSJung-uk Kim 
2075*da327cd2SJung-uk Kim static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
20767bded2dbSJung-uk Kim {
2077*da327cd2SJung-uk Kim     int sig_nid, use_pc_sigalgs = 0;
20787bded2dbSJung-uk Kim     size_t i;
2079*da327cd2SJung-uk Kim     const SIGALG_LOOKUP *sigalg;
2080*da327cd2SJung-uk Kim     size_t sigalgslen;
20817bded2dbSJung-uk Kim     if (default_nid == -1)
20827bded2dbSJung-uk Kim         return 1;
20837bded2dbSJung-uk Kim     sig_nid = X509_get_signature_nid(x);
20847bded2dbSJung-uk Kim     if (default_nid)
20857bded2dbSJung-uk Kim         return sig_nid == default_nid ? 1 : 0;
2086*da327cd2SJung-uk Kim 
2087*da327cd2SJung-uk Kim     if (SSL_IS_TLS13(s) && s->s3->tmp.peer_cert_sigalgs != NULL) {
2088*da327cd2SJung-uk Kim         /*
2089*da327cd2SJung-uk Kim          * If we're in TLSv1.3 then we only get here if we're checking the
2090*da327cd2SJung-uk Kim          * chain. If the peer has specified peer_cert_sigalgs then we use them
2091*da327cd2SJung-uk Kim          * otherwise we default to normal sigalgs.
2092*da327cd2SJung-uk Kim          */
2093*da327cd2SJung-uk Kim         sigalgslen = s->s3->tmp.peer_cert_sigalgslen;
2094*da327cd2SJung-uk Kim         use_pc_sigalgs = 1;
2095*da327cd2SJung-uk Kim     } else {
2096*da327cd2SJung-uk Kim         sigalgslen = s->shared_sigalgslen;
2097*da327cd2SJung-uk Kim     }
2098*da327cd2SJung-uk Kim     for (i = 0; i < sigalgslen; i++) {
2099*da327cd2SJung-uk Kim         sigalg = use_pc_sigalgs
2100*da327cd2SJung-uk Kim                  ? tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i])
2101*da327cd2SJung-uk Kim                  : s->shared_sigalgs[i];
2102*da327cd2SJung-uk Kim         if (sig_nid == sigalg->sigandhash)
21037bded2dbSJung-uk Kim             return 1;
2104*da327cd2SJung-uk Kim     }
21057bded2dbSJung-uk Kim     return 0;
21067bded2dbSJung-uk Kim }
21077bded2dbSJung-uk Kim 
21087bded2dbSJung-uk Kim /* Check to see if a certificate issuer name matches list of CA names */
21097bded2dbSJung-uk Kim static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
21107bded2dbSJung-uk Kim {
21117bded2dbSJung-uk Kim     X509_NAME *nm;
21127bded2dbSJung-uk Kim     int i;
21137bded2dbSJung-uk Kim     nm = X509_get_issuer_name(x);
21147bded2dbSJung-uk Kim     for (i = 0; i < sk_X509_NAME_num(names); i++) {
21157bded2dbSJung-uk Kim         if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
21167bded2dbSJung-uk Kim             return 1;
21177bded2dbSJung-uk Kim     }
21187bded2dbSJung-uk Kim     return 0;
21197bded2dbSJung-uk Kim }
21207bded2dbSJung-uk Kim 
21217bded2dbSJung-uk Kim /*
21227bded2dbSJung-uk Kim  * Check certificate chain is consistent with TLS extensions and is usable by
21237bded2dbSJung-uk Kim  * server. This servers two purposes: it allows users to check chains before
21247bded2dbSJung-uk Kim  * passing them to the server and it allows the server to check chains before
21257bded2dbSJung-uk Kim  * attempting to use them.
21267bded2dbSJung-uk Kim  */
21277bded2dbSJung-uk Kim 
2128e71b7053SJung-uk Kim /* Flags which need to be set for a certificate when strict mode not set */
21297bded2dbSJung-uk Kim 
21307bded2dbSJung-uk Kim #define CERT_PKEY_VALID_FLAGS \
21317bded2dbSJung-uk Kim         (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
21327bded2dbSJung-uk Kim /* Strict mode flags */
21337bded2dbSJung-uk Kim #define CERT_PKEY_STRICT_FLAGS \
21347bded2dbSJung-uk Kim          (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
21357bded2dbSJung-uk Kim          | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
21367bded2dbSJung-uk Kim 
21377bded2dbSJung-uk Kim int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
21387bded2dbSJung-uk Kim                      int idx)
21397bded2dbSJung-uk Kim {
21407bded2dbSJung-uk Kim     int i;
21417bded2dbSJung-uk Kim     int rv = 0;
21427bded2dbSJung-uk Kim     int check_flags = 0, strict_mode;
21437bded2dbSJung-uk Kim     CERT_PKEY *cpk = NULL;
21447bded2dbSJung-uk Kim     CERT *c = s->cert;
2145e71b7053SJung-uk Kim     uint32_t *pvalid;
21467bded2dbSJung-uk Kim     unsigned int suiteb_flags = tls1_suiteb(s);
21477bded2dbSJung-uk Kim     /* idx == -1 means checking server chains */
21487bded2dbSJung-uk Kim     if (idx != -1) {
21497bded2dbSJung-uk Kim         /* idx == -2 means checking client certificate chains */
21507bded2dbSJung-uk Kim         if (idx == -2) {
21517bded2dbSJung-uk Kim             cpk = c->key;
2152e71b7053SJung-uk Kim             idx = (int)(cpk - c->pkeys);
21537bded2dbSJung-uk Kim         } else
21547bded2dbSJung-uk Kim             cpk = c->pkeys + idx;
2155e71b7053SJung-uk Kim         pvalid = s->s3->tmp.valid_flags + idx;
21567bded2dbSJung-uk Kim         x = cpk->x509;
21577bded2dbSJung-uk Kim         pk = cpk->privatekey;
21587bded2dbSJung-uk Kim         chain = cpk->chain;
21597bded2dbSJung-uk Kim         strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
21607bded2dbSJung-uk Kim         /* If no cert or key, forget it */
21617bded2dbSJung-uk Kim         if (!x || !pk)
21627bded2dbSJung-uk Kim             goto end;
21637bded2dbSJung-uk Kim     } else {
2164e71b7053SJung-uk Kim         size_t certidx;
2165e71b7053SJung-uk Kim 
21667bded2dbSJung-uk Kim         if (!x || !pk)
21677bded2dbSJung-uk Kim             return 0;
2168e71b7053SJung-uk Kim 
2169e71b7053SJung-uk Kim         if (ssl_cert_lookup_by_pkey(pk, &certidx) == NULL)
21707bded2dbSJung-uk Kim             return 0;
2171e71b7053SJung-uk Kim         idx = certidx;
2172e71b7053SJung-uk Kim         pvalid = s->s3->tmp.valid_flags + idx;
2173e71b7053SJung-uk Kim 
21747bded2dbSJung-uk Kim         if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
21757bded2dbSJung-uk Kim             check_flags = CERT_PKEY_STRICT_FLAGS;
21767bded2dbSJung-uk Kim         else
21777bded2dbSJung-uk Kim             check_flags = CERT_PKEY_VALID_FLAGS;
21787bded2dbSJung-uk Kim         strict_mode = 1;
21797bded2dbSJung-uk Kim     }
21807bded2dbSJung-uk Kim 
21817bded2dbSJung-uk Kim     if (suiteb_flags) {
21827bded2dbSJung-uk Kim         int ok;
21837bded2dbSJung-uk Kim         if (check_flags)
21847bded2dbSJung-uk Kim             check_flags |= CERT_PKEY_SUITEB;
21857bded2dbSJung-uk Kim         ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
21867bded2dbSJung-uk Kim         if (ok == X509_V_OK)
21877bded2dbSJung-uk Kim             rv |= CERT_PKEY_SUITEB;
21887bded2dbSJung-uk Kim         else if (!check_flags)
21897bded2dbSJung-uk Kim             goto end;
21907bded2dbSJung-uk Kim     }
21917bded2dbSJung-uk Kim 
21927bded2dbSJung-uk Kim     /*
21937bded2dbSJung-uk Kim      * Check all signature algorithms are consistent with signature
21947bded2dbSJung-uk Kim      * algorithms extension if TLS 1.2 or later and strict mode.
21957bded2dbSJung-uk Kim      */
21967bded2dbSJung-uk Kim     if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
21977bded2dbSJung-uk Kim         int default_nid;
2198e71b7053SJung-uk Kim         int rsign = 0;
2199e71b7053SJung-uk Kim         if (s->s3->tmp.peer_cert_sigalgs != NULL
2200e71b7053SJung-uk Kim                 || s->s3->tmp.peer_sigalgs != NULL) {
22017bded2dbSJung-uk Kim             default_nid = 0;
22027bded2dbSJung-uk Kim         /* If no sigalgs extension use defaults from RFC5246 */
2203e71b7053SJung-uk Kim         } else {
22047bded2dbSJung-uk Kim             switch (idx) {
2205e71b7053SJung-uk Kim             case SSL_PKEY_RSA:
2206e71b7053SJung-uk Kim                 rsign = EVP_PKEY_RSA;
22077bded2dbSJung-uk Kim                 default_nid = NID_sha1WithRSAEncryption;
22087bded2dbSJung-uk Kim                 break;
22097bded2dbSJung-uk Kim 
22107bded2dbSJung-uk Kim             case SSL_PKEY_DSA_SIGN:
2211e71b7053SJung-uk Kim                 rsign = EVP_PKEY_DSA;
22127bded2dbSJung-uk Kim                 default_nid = NID_dsaWithSHA1;
22137bded2dbSJung-uk Kim                 break;
22147bded2dbSJung-uk Kim 
22157bded2dbSJung-uk Kim             case SSL_PKEY_ECC:
2216e71b7053SJung-uk Kim                 rsign = EVP_PKEY_EC;
22177bded2dbSJung-uk Kim                 default_nid = NID_ecdsa_with_SHA1;
22187bded2dbSJung-uk Kim                 break;
22197bded2dbSJung-uk Kim 
2220e71b7053SJung-uk Kim             case SSL_PKEY_GOST01:
2221e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2001;
2222e71b7053SJung-uk Kim                 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
2223e71b7053SJung-uk Kim                 break;
2224e71b7053SJung-uk Kim 
2225e71b7053SJung-uk Kim             case SSL_PKEY_GOST12_256:
2226e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2012_256;
2227e71b7053SJung-uk Kim                 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
2228e71b7053SJung-uk Kim                 break;
2229e71b7053SJung-uk Kim 
2230e71b7053SJung-uk Kim             case SSL_PKEY_GOST12_512:
2231e71b7053SJung-uk Kim                 rsign = NID_id_GostR3410_2012_512;
2232e71b7053SJung-uk Kim                 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
2233e71b7053SJung-uk Kim                 break;
2234e71b7053SJung-uk Kim 
22357bded2dbSJung-uk Kim             default:
22367bded2dbSJung-uk Kim                 default_nid = -1;
22377bded2dbSJung-uk Kim                 break;
22387bded2dbSJung-uk Kim             }
22397bded2dbSJung-uk Kim         }
22407bded2dbSJung-uk Kim         /*
22417bded2dbSJung-uk Kim          * If peer sent no signature algorithms extension and we have set
22427bded2dbSJung-uk Kim          * preferred signature algorithms check we support sha1.
22437bded2dbSJung-uk Kim          */
22447bded2dbSJung-uk Kim         if (default_nid > 0 && c->conf_sigalgs) {
22457bded2dbSJung-uk Kim             size_t j;
2246e71b7053SJung-uk Kim             const uint16_t *p = c->conf_sigalgs;
2247e71b7053SJung-uk Kim             for (j = 0; j < c->conf_sigalgslen; j++, p++) {
2248e71b7053SJung-uk Kim                 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*p);
2249e71b7053SJung-uk Kim 
2250e71b7053SJung-uk Kim                 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
22517bded2dbSJung-uk Kim                     break;
22527bded2dbSJung-uk Kim             }
22537bded2dbSJung-uk Kim             if (j == c->conf_sigalgslen) {
22547bded2dbSJung-uk Kim                 if (check_flags)
22557bded2dbSJung-uk Kim                     goto skip_sigs;
22567bded2dbSJung-uk Kim                 else
22577bded2dbSJung-uk Kim                     goto end;
22587bded2dbSJung-uk Kim             }
22597bded2dbSJung-uk Kim         }
22607bded2dbSJung-uk Kim         /* Check signature algorithm of each cert in chain */
2261*da327cd2SJung-uk Kim         if (SSL_IS_TLS13(s)) {
2262*da327cd2SJung-uk Kim             /*
2263*da327cd2SJung-uk Kim              * We only get here if the application has called SSL_check_chain(),
2264*da327cd2SJung-uk Kim              * so check_flags is always set.
2265*da327cd2SJung-uk Kim              */
2266*da327cd2SJung-uk Kim             if (find_sig_alg(s, x, pk) != NULL)
2267*da327cd2SJung-uk Kim                 rv |= CERT_PKEY_EE_SIGNATURE;
2268*da327cd2SJung-uk Kim         } else if (!tls1_check_sig_alg(s, x, default_nid)) {
22697bded2dbSJung-uk Kim             if (!check_flags)
22707bded2dbSJung-uk Kim                 goto end;
22717bded2dbSJung-uk Kim         } else
22727bded2dbSJung-uk Kim             rv |= CERT_PKEY_EE_SIGNATURE;
22737bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_SIGNATURE;
22747bded2dbSJung-uk Kim         for (i = 0; i < sk_X509_num(chain); i++) {
2275*da327cd2SJung-uk Kim             if (!tls1_check_sig_alg(s, sk_X509_value(chain, i), default_nid)) {
22767bded2dbSJung-uk Kim                 if (check_flags) {
22777bded2dbSJung-uk Kim                     rv &= ~CERT_PKEY_CA_SIGNATURE;
22787bded2dbSJung-uk Kim                     break;
22797bded2dbSJung-uk Kim                 } else
22807bded2dbSJung-uk Kim                     goto end;
22817bded2dbSJung-uk Kim             }
22827bded2dbSJung-uk Kim         }
22837bded2dbSJung-uk Kim     }
22847bded2dbSJung-uk Kim     /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
22857bded2dbSJung-uk Kim     else if (check_flags)
22867bded2dbSJung-uk Kim         rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
22877bded2dbSJung-uk Kim  skip_sigs:
22887bded2dbSJung-uk Kim     /* Check cert parameters are consistent */
2289e71b7053SJung-uk Kim     if (tls1_check_cert_param(s, x, 1))
22907bded2dbSJung-uk Kim         rv |= CERT_PKEY_EE_PARAM;
22917bded2dbSJung-uk Kim     else if (!check_flags)
22927bded2dbSJung-uk Kim         goto end;
22937bded2dbSJung-uk Kim     if (!s->server)
22947bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_PARAM;
22957bded2dbSJung-uk Kim     /* In strict mode check rest of chain too */
22967bded2dbSJung-uk Kim     else if (strict_mode) {
22977bded2dbSJung-uk Kim         rv |= CERT_PKEY_CA_PARAM;
22987bded2dbSJung-uk Kim         for (i = 0; i < sk_X509_num(chain); i++) {
22997bded2dbSJung-uk Kim             X509 *ca = sk_X509_value(chain, i);
23007bded2dbSJung-uk Kim             if (!tls1_check_cert_param(s, ca, 0)) {
23017bded2dbSJung-uk Kim                 if (check_flags) {
23027bded2dbSJung-uk Kim                     rv &= ~CERT_PKEY_CA_PARAM;
23037bded2dbSJung-uk Kim                     break;
23047bded2dbSJung-uk Kim                 } else
23057bded2dbSJung-uk Kim                     goto end;
23067bded2dbSJung-uk Kim             }
23077bded2dbSJung-uk Kim         }
23087bded2dbSJung-uk Kim     }
23097bded2dbSJung-uk Kim     if (!s->server && strict_mode) {
23107bded2dbSJung-uk Kim         STACK_OF(X509_NAME) *ca_dn;
23117bded2dbSJung-uk Kim         int check_type = 0;
2312e71b7053SJung-uk Kim         switch (EVP_PKEY_id(pk)) {
23137bded2dbSJung-uk Kim         case EVP_PKEY_RSA:
23147bded2dbSJung-uk Kim             check_type = TLS_CT_RSA_SIGN;
23157bded2dbSJung-uk Kim             break;
23167bded2dbSJung-uk Kim         case EVP_PKEY_DSA:
23177bded2dbSJung-uk Kim             check_type = TLS_CT_DSS_SIGN;
23187bded2dbSJung-uk Kim             break;
23197bded2dbSJung-uk Kim         case EVP_PKEY_EC:
23207bded2dbSJung-uk Kim             check_type = TLS_CT_ECDSA_SIGN;
23217bded2dbSJung-uk Kim             break;
23227bded2dbSJung-uk Kim         }
23237bded2dbSJung-uk Kim         if (check_type) {
2324e71b7053SJung-uk Kim             const uint8_t *ctypes = s->s3->tmp.ctype;
2325e71b7053SJung-uk Kim             size_t j;
2326e71b7053SJung-uk Kim 
2327e71b7053SJung-uk Kim             for (j = 0; j < s->s3->tmp.ctype_len; j++, ctypes++) {
2328e71b7053SJung-uk Kim                 if (*ctypes == check_type) {
23297bded2dbSJung-uk Kim                     rv |= CERT_PKEY_CERT_TYPE;
23307bded2dbSJung-uk Kim                     break;
23317bded2dbSJung-uk Kim                 }
23327bded2dbSJung-uk Kim             }
23337bded2dbSJung-uk Kim             if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
23347bded2dbSJung-uk Kim                 goto end;
2335e71b7053SJung-uk Kim         } else {
23367bded2dbSJung-uk Kim             rv |= CERT_PKEY_CERT_TYPE;
2337e71b7053SJung-uk Kim         }
23387bded2dbSJung-uk Kim 
2339e71b7053SJung-uk Kim         ca_dn = s->s3->tmp.peer_ca_names;
23407bded2dbSJung-uk Kim 
23417bded2dbSJung-uk Kim         if (!sk_X509_NAME_num(ca_dn))
23427bded2dbSJung-uk Kim             rv |= CERT_PKEY_ISSUER_NAME;
23437bded2dbSJung-uk Kim 
23447bded2dbSJung-uk Kim         if (!(rv & CERT_PKEY_ISSUER_NAME)) {
23457bded2dbSJung-uk Kim             if (ssl_check_ca_name(ca_dn, x))
23467bded2dbSJung-uk Kim                 rv |= CERT_PKEY_ISSUER_NAME;
23477bded2dbSJung-uk Kim         }
23487bded2dbSJung-uk Kim         if (!(rv & CERT_PKEY_ISSUER_NAME)) {
23497bded2dbSJung-uk Kim             for (i = 0; i < sk_X509_num(chain); i++) {
23507bded2dbSJung-uk Kim                 X509 *xtmp = sk_X509_value(chain, i);
23517bded2dbSJung-uk Kim                 if (ssl_check_ca_name(ca_dn, xtmp)) {
23527bded2dbSJung-uk Kim                     rv |= CERT_PKEY_ISSUER_NAME;
23537bded2dbSJung-uk Kim                     break;
23547bded2dbSJung-uk Kim                 }
23557bded2dbSJung-uk Kim             }
23567bded2dbSJung-uk Kim         }
23577bded2dbSJung-uk Kim         if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
23587bded2dbSJung-uk Kim             goto end;
23597bded2dbSJung-uk Kim     } else
23607bded2dbSJung-uk Kim         rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
23617bded2dbSJung-uk Kim 
23627bded2dbSJung-uk Kim     if (!check_flags || (rv & check_flags) == check_flags)
23637bded2dbSJung-uk Kim         rv |= CERT_PKEY_VALID;
23647bded2dbSJung-uk Kim 
23657bded2dbSJung-uk Kim  end:
23667bded2dbSJung-uk Kim 
2367e71b7053SJung-uk Kim     if (TLS1_get_version(s) >= TLS1_2_VERSION)
2368e71b7053SJung-uk Kim         rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2369e71b7053SJung-uk Kim     else
23707bded2dbSJung-uk Kim         rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
23717bded2dbSJung-uk Kim 
23727bded2dbSJung-uk Kim     /*
23737bded2dbSJung-uk Kim      * When checking a CERT_PKEY structure all flags are irrelevant if the
23747bded2dbSJung-uk Kim      * chain is invalid.
23757bded2dbSJung-uk Kim      */
23767bded2dbSJung-uk Kim     if (!check_flags) {
2377e71b7053SJung-uk Kim         if (rv & CERT_PKEY_VALID) {
2378e71b7053SJung-uk Kim             *pvalid = rv;
2379e71b7053SJung-uk Kim         } else {
2380e71b7053SJung-uk Kim             /* Preserve sign and explicit sign flag, clear rest */
2381e71b7053SJung-uk Kim             *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
23827bded2dbSJung-uk Kim             return 0;
23837bded2dbSJung-uk Kim         }
23847bded2dbSJung-uk Kim     }
23857bded2dbSJung-uk Kim     return rv;
23867bded2dbSJung-uk Kim }
23877bded2dbSJung-uk Kim 
23887bded2dbSJung-uk Kim /* Set validity of certificates in an SSL structure */
23897bded2dbSJung-uk Kim void tls1_set_cert_validity(SSL *s)
23907bded2dbSJung-uk Kim {
2391e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
2392e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_PSS_SIGN);
23937bded2dbSJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
23947bded2dbSJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
2395e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2396e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2397e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
2398e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED25519);
2399e71b7053SJung-uk Kim     tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED448);
24007bded2dbSJung-uk Kim }
24017bded2dbSJung-uk Kim 
2402e71b7053SJung-uk Kim /* User level utility function to check a chain is suitable */
24037bded2dbSJung-uk Kim int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
24047bded2dbSJung-uk Kim {
24057bded2dbSJung-uk Kim     return tls1_check_chain(s, x, pk, chain, -1);
24067bded2dbSJung-uk Kim }
24077bded2dbSJung-uk Kim 
2408e71b7053SJung-uk Kim #ifndef OPENSSL_NO_DH
2409e71b7053SJung-uk Kim DH *ssl_get_auto_dh(SSL *s)
2410e71b7053SJung-uk Kim {
2411e71b7053SJung-uk Kim     int dh_secbits = 80;
2412e71b7053SJung-uk Kim     if (s->cert->dh_tmp_auto == 2)
2413e71b7053SJung-uk Kim         return DH_get_1024_160();
2414e71b7053SJung-uk Kim     if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
2415e71b7053SJung-uk Kim         if (s->s3->tmp.new_cipher->strength_bits == 256)
2416e71b7053SJung-uk Kim             dh_secbits = 128;
2417e71b7053SJung-uk Kim         else
2418e71b7053SJung-uk Kim             dh_secbits = 80;
2419e71b7053SJung-uk Kim     } else {
2420e71b7053SJung-uk Kim         if (s->s3->tmp.cert == NULL)
2421e71b7053SJung-uk Kim             return NULL;
2422e71b7053SJung-uk Kim         dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
2423e71b7053SJung-uk Kim     }
2424e71b7053SJung-uk Kim 
2425e71b7053SJung-uk Kim     if (dh_secbits >= 128) {
2426e71b7053SJung-uk Kim         DH *dhp = DH_new();
2427e71b7053SJung-uk Kim         BIGNUM *p, *g;
2428e71b7053SJung-uk Kim         if (dhp == NULL)
2429e71b7053SJung-uk Kim             return NULL;
2430e71b7053SJung-uk Kim         g = BN_new();
2431e71b7053SJung-uk Kim         if (g == NULL || !BN_set_word(g, 2)) {
2432e71b7053SJung-uk Kim             DH_free(dhp);
2433e71b7053SJung-uk Kim             BN_free(g);
2434e71b7053SJung-uk Kim             return NULL;
2435e71b7053SJung-uk Kim         }
2436e71b7053SJung-uk Kim         if (dh_secbits >= 192)
2437e71b7053SJung-uk Kim             p = BN_get_rfc3526_prime_8192(NULL);
2438e71b7053SJung-uk Kim         else
2439e71b7053SJung-uk Kim             p = BN_get_rfc3526_prime_3072(NULL);
2440e71b7053SJung-uk Kim         if (p == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
2441e71b7053SJung-uk Kim             DH_free(dhp);
2442e71b7053SJung-uk Kim             BN_free(p);
2443e71b7053SJung-uk Kim             BN_free(g);
2444e71b7053SJung-uk Kim             return NULL;
2445e71b7053SJung-uk Kim         }
2446e71b7053SJung-uk Kim         return dhp;
2447e71b7053SJung-uk Kim     }
2448e71b7053SJung-uk Kim     if (dh_secbits >= 112)
2449e71b7053SJung-uk Kim         return DH_get_2048_224();
2450e71b7053SJung-uk Kim     return DH_get_1024_160();
2451e71b7053SJung-uk Kim }
24527bded2dbSJung-uk Kim #endif
2453e71b7053SJung-uk Kim 
2454e71b7053SJung-uk Kim static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2455e71b7053SJung-uk Kim {
2456e71b7053SJung-uk Kim     int secbits = -1;
2457e71b7053SJung-uk Kim     EVP_PKEY *pkey = X509_get0_pubkey(x);
2458e71b7053SJung-uk Kim     if (pkey) {
2459e71b7053SJung-uk Kim         /*
2460e71b7053SJung-uk Kim          * If no parameters this will return -1 and fail using the default
2461e71b7053SJung-uk Kim          * security callback for any non-zero security level. This will
2462e71b7053SJung-uk Kim          * reject keys which omit parameters but this only affects DSA and
2463e71b7053SJung-uk Kim          * omission of parameters is never (?) done in practice.
2464e71b7053SJung-uk Kim          */
2465e71b7053SJung-uk Kim         secbits = EVP_PKEY_security_bits(pkey);
2466e71b7053SJung-uk Kim     }
2467e71b7053SJung-uk Kim     if (s)
2468e71b7053SJung-uk Kim         return ssl_security(s, op, secbits, 0, x);
2469e71b7053SJung-uk Kim     else
2470e71b7053SJung-uk Kim         return ssl_ctx_security(ctx, op, secbits, 0, x);
2471e71b7053SJung-uk Kim }
2472e71b7053SJung-uk Kim 
2473e71b7053SJung-uk Kim static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2474e71b7053SJung-uk Kim {
2475e71b7053SJung-uk Kim     /* Lookup signature algorithm digest */
2476e71b7053SJung-uk Kim     int secbits, nid, pknid;
2477e71b7053SJung-uk Kim     /* Don't check signature if self signed */
2478e71b7053SJung-uk Kim     if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2479e71b7053SJung-uk Kim         return 1;
2480e71b7053SJung-uk Kim     if (!X509_get_signature_info(x, &nid, &pknid, &secbits, NULL))
2481e71b7053SJung-uk Kim         secbits = -1;
2482e71b7053SJung-uk Kim     /* If digest NID not defined use signature NID */
2483e71b7053SJung-uk Kim     if (nid == NID_undef)
2484e71b7053SJung-uk Kim         nid = pknid;
2485e71b7053SJung-uk Kim     if (s)
2486e71b7053SJung-uk Kim         return ssl_security(s, op, secbits, nid, x);
2487e71b7053SJung-uk Kim     else
2488e71b7053SJung-uk Kim         return ssl_ctx_security(ctx, op, secbits, nid, x);
2489e71b7053SJung-uk Kim }
2490e71b7053SJung-uk Kim 
2491e71b7053SJung-uk Kim int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
2492e71b7053SJung-uk Kim {
2493e71b7053SJung-uk Kim     if (vfy)
2494e71b7053SJung-uk Kim         vfy = SSL_SECOP_PEER;
2495e71b7053SJung-uk Kim     if (is_ee) {
2496e71b7053SJung-uk Kim         if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2497e71b7053SJung-uk Kim             return SSL_R_EE_KEY_TOO_SMALL;
2498e71b7053SJung-uk Kim     } else {
2499e71b7053SJung-uk Kim         if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2500e71b7053SJung-uk Kim             return SSL_R_CA_KEY_TOO_SMALL;
2501e71b7053SJung-uk Kim     }
2502e71b7053SJung-uk Kim     if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2503e71b7053SJung-uk Kim         return SSL_R_CA_MD_TOO_WEAK;
2504e71b7053SJung-uk Kim     return 1;
2505e71b7053SJung-uk Kim }
2506e71b7053SJung-uk Kim 
2507e71b7053SJung-uk Kim /*
2508e71b7053SJung-uk Kim  * Check security of a chain, if |sk| includes the end entity certificate then
2509e71b7053SJung-uk Kim  * |x| is NULL. If |vfy| is 1 then we are verifying a peer chain and not sending
2510e71b7053SJung-uk Kim  * one to the peer. Return values: 1 if ok otherwise error code to use
2511e71b7053SJung-uk Kim  */
2512e71b7053SJung-uk Kim 
2513e71b7053SJung-uk Kim int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
2514e71b7053SJung-uk Kim {
2515e71b7053SJung-uk Kim     int rv, start_idx, i;
2516e71b7053SJung-uk Kim     if (x == NULL) {
2517e71b7053SJung-uk Kim         x = sk_X509_value(sk, 0);
2518e71b7053SJung-uk Kim         start_idx = 1;
2519e71b7053SJung-uk Kim     } else
2520e71b7053SJung-uk Kim         start_idx = 0;
2521e71b7053SJung-uk Kim 
2522e71b7053SJung-uk Kim     rv = ssl_security_cert(s, NULL, x, vfy, 1);
2523e71b7053SJung-uk Kim     if (rv != 1)
2524e71b7053SJung-uk Kim         return rv;
2525e71b7053SJung-uk Kim 
2526e71b7053SJung-uk Kim     for (i = start_idx; i < sk_X509_num(sk); i++) {
2527e71b7053SJung-uk Kim         x = sk_X509_value(sk, i);
2528e71b7053SJung-uk Kim         rv = ssl_security_cert(s, NULL, x, vfy, 0);
2529e71b7053SJung-uk Kim         if (rv != 1)
2530e71b7053SJung-uk Kim             return rv;
2531e71b7053SJung-uk Kim     }
2532e71b7053SJung-uk Kim     return 1;
2533e71b7053SJung-uk Kim }
2534e71b7053SJung-uk Kim 
2535e71b7053SJung-uk Kim /*
2536e71b7053SJung-uk Kim  * For TLS 1.2 servers check if we have a certificate which can be used
2537e71b7053SJung-uk Kim  * with the signature algorithm "lu" and return index of certificate.
2538e71b7053SJung-uk Kim  */
2539e71b7053SJung-uk Kim 
2540e71b7053SJung-uk Kim static int tls12_get_cert_sigalg_idx(const SSL *s, const SIGALG_LOOKUP *lu)
2541e71b7053SJung-uk Kim {
2542e71b7053SJung-uk Kim     int sig_idx = lu->sig_idx;
2543e71b7053SJung-uk Kim     const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(sig_idx);
2544e71b7053SJung-uk Kim 
2545e71b7053SJung-uk Kim     /* If not recognised or not supported by cipher mask it is not suitable */
2546e71b7053SJung-uk Kim     if (clu == NULL
2547e71b7053SJung-uk Kim             || (clu->amask & s->s3->tmp.new_cipher->algorithm_auth) == 0
2548e71b7053SJung-uk Kim             || (clu->nid == EVP_PKEY_RSA_PSS
2549e71b7053SJung-uk Kim                 && (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kRSA) != 0))
2550e71b7053SJung-uk Kim         return -1;
2551e71b7053SJung-uk Kim 
2552e71b7053SJung-uk Kim     return s->s3->tmp.valid_flags[sig_idx] & CERT_PKEY_VALID ? sig_idx : -1;
2553e71b7053SJung-uk Kim }
2554e71b7053SJung-uk Kim 
2555e71b7053SJung-uk Kim /*
2556*da327cd2SJung-uk Kim  * Checks the given cert against signature_algorithm_cert restrictions sent by
2557*da327cd2SJung-uk Kim  * the peer (if any) as well as whether the hash from the sigalg is usable with
2558*da327cd2SJung-uk Kim  * the key.
2559*da327cd2SJung-uk Kim  * Returns true if the cert is usable and false otherwise.
2560e71b7053SJung-uk Kim  */
2561*da327cd2SJung-uk Kim static int check_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
2562*da327cd2SJung-uk Kim                              EVP_PKEY *pkey)
2563e71b7053SJung-uk Kim {
2564e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu;
25656935a639SJung-uk Kim     int mdnid, pknid, default_mdnid;
2566e71b7053SJung-uk Kim     size_t i;
2567e71b7053SJung-uk Kim 
25686935a639SJung-uk Kim     /* If the EVP_PKEY reports a mandatory digest, allow nothing else. */
25696935a639SJung-uk Kim     ERR_set_mark();
2570*da327cd2SJung-uk Kim     if (EVP_PKEY_get_default_digest_nid(pkey, &default_mdnid) == 2 &&
2571*da327cd2SJung-uk Kim         sig->hash != default_mdnid)
2572*da327cd2SJung-uk Kim             return 0;
2573*da327cd2SJung-uk Kim 
2574*da327cd2SJung-uk Kim     /* If it didn't report a mandatory NID, for whatever reasons,
25756935a639SJung-uk Kim      * just clear the error and allow all hashes to be used. */
25766935a639SJung-uk Kim     ERR_pop_to_mark();
2577*da327cd2SJung-uk Kim 
2578e71b7053SJung-uk Kim     if (s->s3->tmp.peer_cert_sigalgs != NULL) {
2579e71b7053SJung-uk Kim         for (i = 0; i < s->s3->tmp.peer_cert_sigalgslen; i++) {
2580e71b7053SJung-uk Kim             lu = tls1_lookup_sigalg(s->s3->tmp.peer_cert_sigalgs[i]);
2581e71b7053SJung-uk Kim             if (lu == NULL
2582*da327cd2SJung-uk Kim                 || !X509_get_signature_info(x, &mdnid, &pknid, NULL, NULL))
2583e71b7053SJung-uk Kim                 continue;
2584e71b7053SJung-uk Kim             /*
2585e71b7053SJung-uk Kim              * TODO this does not differentiate between the
2586e71b7053SJung-uk Kim              * rsa_pss_pss_* and rsa_pss_rsae_* schemes since we do not
2587e71b7053SJung-uk Kim              * have a chain here that lets us look at the key OID in the
2588e71b7053SJung-uk Kim              * signing certificate.
2589e71b7053SJung-uk Kim              */
2590e71b7053SJung-uk Kim             if (mdnid == lu->hash && pknid == lu->sig)
2591e71b7053SJung-uk Kim                 return 1;
2592e71b7053SJung-uk Kim         }
2593e71b7053SJung-uk Kim         return 0;
2594e71b7053SJung-uk Kim     }
2595*da327cd2SJung-uk Kim     return 1;
2596*da327cd2SJung-uk Kim }
2597*da327cd2SJung-uk Kim 
2598*da327cd2SJung-uk Kim /*
2599*da327cd2SJung-uk Kim  * Returns true if |s| has a usable certificate configured for use
2600*da327cd2SJung-uk Kim  * with signature scheme |sig|.
2601*da327cd2SJung-uk Kim  * "Usable" includes a check for presence as well as applying
2602*da327cd2SJung-uk Kim  * the signature_algorithm_cert restrictions sent by the peer (if any).
2603*da327cd2SJung-uk Kim  * Returns false if no usable certificate is found.
2604*da327cd2SJung-uk Kim  */
2605*da327cd2SJung-uk Kim static int has_usable_cert(SSL *s, const SIGALG_LOOKUP *sig, int idx)
2606*da327cd2SJung-uk Kim {
2607*da327cd2SJung-uk Kim     /* TLS 1.2 callers can override sig->sig_idx, but not TLS 1.3 callers. */
2608*da327cd2SJung-uk Kim     if (idx == -1)
2609*da327cd2SJung-uk Kim         idx = sig->sig_idx;
2610*da327cd2SJung-uk Kim     if (!ssl_has_cert(s, idx))
2611*da327cd2SJung-uk Kim         return 0;
2612*da327cd2SJung-uk Kim 
2613*da327cd2SJung-uk Kim     return check_cert_usable(s, sig, s->cert->pkeys[idx].x509,
2614*da327cd2SJung-uk Kim                              s->cert->pkeys[idx].privatekey);
2615*da327cd2SJung-uk Kim }
2616*da327cd2SJung-uk Kim 
2617*da327cd2SJung-uk Kim /*
2618*da327cd2SJung-uk Kim  * Returns true if the supplied cert |x| and key |pkey| is usable with the
2619*da327cd2SJung-uk Kim  * specified signature scheme |sig|, or false otherwise.
2620*da327cd2SJung-uk Kim  */
2621*da327cd2SJung-uk Kim static int is_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
2622*da327cd2SJung-uk Kim                           EVP_PKEY *pkey)
2623*da327cd2SJung-uk Kim {
2624*da327cd2SJung-uk Kim     size_t idx;
2625*da327cd2SJung-uk Kim 
2626*da327cd2SJung-uk Kim     if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
2627*da327cd2SJung-uk Kim         return 0;
2628*da327cd2SJung-uk Kim 
2629*da327cd2SJung-uk Kim     /* Check the key is consistent with the sig alg */
2630*da327cd2SJung-uk Kim     if ((int)idx != sig->sig_idx)
2631*da327cd2SJung-uk Kim         return 0;
2632*da327cd2SJung-uk Kim 
2633*da327cd2SJung-uk Kim     return check_cert_usable(s, sig, x, pkey);
2634*da327cd2SJung-uk Kim }
2635*da327cd2SJung-uk Kim 
2636*da327cd2SJung-uk Kim /*
2637*da327cd2SJung-uk Kim  * Find a signature scheme that works with the supplied certificate |x| and key
2638*da327cd2SJung-uk Kim  * |pkey|. |x| and |pkey| may be NULL in which case we additionally look at our
2639*da327cd2SJung-uk Kim  * available certs/keys to find one that works.
2640*da327cd2SJung-uk Kim  */
2641*da327cd2SJung-uk Kim static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey)
2642*da327cd2SJung-uk Kim {
2643*da327cd2SJung-uk Kim     const SIGALG_LOOKUP *lu = NULL;
2644*da327cd2SJung-uk Kim     size_t i;
2645*da327cd2SJung-uk Kim #ifndef OPENSSL_NO_EC
2646*da327cd2SJung-uk Kim     int curve = -1;
2647*da327cd2SJung-uk Kim #endif
2648*da327cd2SJung-uk Kim     EVP_PKEY *tmppkey;
2649*da327cd2SJung-uk Kim 
2650*da327cd2SJung-uk Kim     /* Look for a shared sigalgs matching possible certificates */
2651*da327cd2SJung-uk Kim     for (i = 0; i < s->shared_sigalgslen; i++) {
2652*da327cd2SJung-uk Kim         lu = s->shared_sigalgs[i];
2653*da327cd2SJung-uk Kim 
2654*da327cd2SJung-uk Kim         /* Skip SHA1, SHA224, DSA and RSA if not PSS */
2655*da327cd2SJung-uk Kim         if (lu->hash == NID_sha1
2656*da327cd2SJung-uk Kim             || lu->hash == NID_sha224
2657*da327cd2SJung-uk Kim             || lu->sig == EVP_PKEY_DSA
2658*da327cd2SJung-uk Kim             || lu->sig == EVP_PKEY_RSA)
2659*da327cd2SJung-uk Kim             continue;
2660*da327cd2SJung-uk Kim         /* Check that we have a cert, and signature_algorithms_cert */
2661*da327cd2SJung-uk Kim         if (!tls1_lookup_md(lu, NULL))
2662*da327cd2SJung-uk Kim             continue;
2663*da327cd2SJung-uk Kim         if ((pkey == NULL && !has_usable_cert(s, lu, -1))
2664*da327cd2SJung-uk Kim                 || (pkey != NULL && !is_cert_usable(s, lu, x, pkey)))
2665*da327cd2SJung-uk Kim             continue;
2666*da327cd2SJung-uk Kim 
2667*da327cd2SJung-uk Kim         tmppkey = (pkey != NULL) ? pkey
2668*da327cd2SJung-uk Kim                                  : s->cert->pkeys[lu->sig_idx].privatekey;
2669*da327cd2SJung-uk Kim 
2670*da327cd2SJung-uk Kim         if (lu->sig == EVP_PKEY_EC) {
2671*da327cd2SJung-uk Kim #ifndef OPENSSL_NO_EC
2672*da327cd2SJung-uk Kim             if (curve == -1) {
2673*da327cd2SJung-uk Kim                 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(tmppkey);
2674*da327cd2SJung-uk Kim                 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2675*da327cd2SJung-uk Kim             }
2676*da327cd2SJung-uk Kim             if (lu->curve != NID_undef && curve != lu->curve)
2677*da327cd2SJung-uk Kim                 continue;
2678*da327cd2SJung-uk Kim #else
2679*da327cd2SJung-uk Kim             continue;
2680*da327cd2SJung-uk Kim #endif
2681*da327cd2SJung-uk Kim         } else if (lu->sig == EVP_PKEY_RSA_PSS) {
2682*da327cd2SJung-uk Kim             /* validate that key is large enough for the signature algorithm */
2683*da327cd2SJung-uk Kim             if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(tmppkey), lu))
2684*da327cd2SJung-uk Kim                 continue;
2685*da327cd2SJung-uk Kim         }
2686*da327cd2SJung-uk Kim         break;
2687*da327cd2SJung-uk Kim     }
2688*da327cd2SJung-uk Kim 
2689*da327cd2SJung-uk Kim     if (i == s->shared_sigalgslen)
2690*da327cd2SJung-uk Kim         return NULL;
2691*da327cd2SJung-uk Kim 
2692*da327cd2SJung-uk Kim     return lu;
2693e71b7053SJung-uk Kim }
2694e71b7053SJung-uk Kim 
2695e71b7053SJung-uk Kim /*
2696e71b7053SJung-uk Kim  * Choose an appropriate signature algorithm based on available certificates
2697e71b7053SJung-uk Kim  * Sets chosen certificate and signature algorithm.
2698e71b7053SJung-uk Kim  *
2699e71b7053SJung-uk Kim  * For servers if we fail to find a required certificate it is a fatal error,
2700e71b7053SJung-uk Kim  * an appropriate error code is set and a TLS alert is sent.
2701e71b7053SJung-uk Kim  *
2702e71b7053SJung-uk Kim  * For clients fatalerrs is set to 0. If a certificate is not suitable it is not
2703e71b7053SJung-uk Kim  * a fatal error: we will either try another certificate or not present one
2704e71b7053SJung-uk Kim  * to the server. In this case no error is set.
2705e71b7053SJung-uk Kim  */
2706e71b7053SJung-uk Kim int tls_choose_sigalg(SSL *s, int fatalerrs)
2707e71b7053SJung-uk Kim {
2708e71b7053SJung-uk Kim     const SIGALG_LOOKUP *lu = NULL;
2709e71b7053SJung-uk Kim     int sig_idx = -1;
2710e71b7053SJung-uk Kim 
2711e71b7053SJung-uk Kim     s->s3->tmp.cert = NULL;
2712e71b7053SJung-uk Kim     s->s3->tmp.sigalg = NULL;
2713e71b7053SJung-uk Kim 
2714e71b7053SJung-uk Kim     if (SSL_IS_TLS13(s)) {
2715*da327cd2SJung-uk Kim         lu = find_sig_alg(s, NULL, NULL);
2716*da327cd2SJung-uk Kim         if (lu == NULL) {
2717e71b7053SJung-uk Kim             if (!fatalerrs)
2718e71b7053SJung-uk Kim                 return 1;
2719e71b7053SJung-uk Kim             SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_CHOOSE_SIGALG,
2720e71b7053SJung-uk Kim                      SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2721e71b7053SJung-uk Kim             return 0;
2722e71b7053SJung-uk Kim         }
2723e71b7053SJung-uk Kim     } else {
2724e71b7053SJung-uk Kim         /* If ciphersuite doesn't require a cert nothing to do */
2725e71b7053SJung-uk Kim         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aCERT))
2726e71b7053SJung-uk Kim             return 1;
2727e71b7053SJung-uk Kim         if (!s->server && !ssl_has_cert(s, s->cert->key - s->cert->pkeys))
2728e71b7053SJung-uk Kim                 return 1;
2729e71b7053SJung-uk Kim 
2730e71b7053SJung-uk Kim         if (SSL_USE_SIGALGS(s)) {
2731e71b7053SJung-uk Kim             size_t i;
2732e71b7053SJung-uk Kim             if (s->s3->tmp.peer_sigalgs != NULL) {
2733e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
2734e71b7053SJung-uk Kim                 int curve;
2735e71b7053SJung-uk Kim 
2736e71b7053SJung-uk Kim                 /* For Suite B need to match signature algorithm to curve */
2737e71b7053SJung-uk Kim                 if (tls1_suiteb(s)) {
2738e71b7053SJung-uk Kim                     EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[SSL_PKEY_ECC].privatekey);
2739e71b7053SJung-uk Kim                     curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2740e71b7053SJung-uk Kim                 } else {
2741e71b7053SJung-uk Kim                     curve = -1;
2742e71b7053SJung-uk Kim                 }
2743e71b7053SJung-uk Kim #endif
2744e71b7053SJung-uk Kim 
2745e71b7053SJung-uk Kim                 /*
2746e71b7053SJung-uk Kim                  * Find highest preference signature algorithm matching
2747e71b7053SJung-uk Kim                  * cert type
2748e71b7053SJung-uk Kim                  */
2749*da327cd2SJung-uk Kim                 for (i = 0; i < s->shared_sigalgslen; i++) {
2750*da327cd2SJung-uk Kim                     lu = s->shared_sigalgs[i];
2751e71b7053SJung-uk Kim 
2752e71b7053SJung-uk Kim                     if (s->server) {
2753e71b7053SJung-uk Kim                         if ((sig_idx = tls12_get_cert_sigalg_idx(s, lu)) == -1)
2754e71b7053SJung-uk Kim                             continue;
2755e71b7053SJung-uk Kim                     } else {
2756e71b7053SJung-uk Kim                         int cc_idx = s->cert->key - s->cert->pkeys;
2757e71b7053SJung-uk Kim 
2758e71b7053SJung-uk Kim                         sig_idx = lu->sig_idx;
2759e71b7053SJung-uk Kim                         if (cc_idx != sig_idx)
2760e71b7053SJung-uk Kim                             continue;
2761e71b7053SJung-uk Kim                     }
2762e71b7053SJung-uk Kim                     /* Check that we have a cert, and sig_algs_cert */
2763e71b7053SJung-uk Kim                     if (!has_usable_cert(s, lu, sig_idx))
2764e71b7053SJung-uk Kim                         continue;
2765e71b7053SJung-uk Kim                     if (lu->sig == EVP_PKEY_RSA_PSS) {
2766e71b7053SJung-uk Kim                         /* validate that key is large enough for the signature algorithm */
2767e71b7053SJung-uk Kim                         EVP_PKEY *pkey = s->cert->pkeys[sig_idx].privatekey;
2768e71b7053SJung-uk Kim 
2769e71b7053SJung-uk Kim                         if (!rsa_pss_check_min_key_size(EVP_PKEY_get0(pkey), lu))
2770e71b7053SJung-uk Kim                             continue;
2771e71b7053SJung-uk Kim                     }
2772e71b7053SJung-uk Kim #ifndef OPENSSL_NO_EC
2773e71b7053SJung-uk Kim                     if (curve == -1 || lu->curve == curve)
2774e71b7053SJung-uk Kim #endif
2775e71b7053SJung-uk Kim                         break;
2776e71b7053SJung-uk Kim                 }
2777*da327cd2SJung-uk Kim                 if (i == s->shared_sigalgslen) {
2778e71b7053SJung-uk Kim                     if (!fatalerrs)
2779e71b7053SJung-uk Kim                         return 1;
2780e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
2781e71b7053SJung-uk Kim                              SSL_F_TLS_CHOOSE_SIGALG,
2782e71b7053SJung-uk Kim                              SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2783e71b7053SJung-uk Kim                     return 0;
2784e71b7053SJung-uk Kim                 }
2785e71b7053SJung-uk Kim             } else {
2786e71b7053SJung-uk Kim                 /*
2787e71b7053SJung-uk Kim                  * If we have no sigalg use defaults
2788e71b7053SJung-uk Kim                  */
2789e71b7053SJung-uk Kim                 const uint16_t *sent_sigs;
2790e71b7053SJung-uk Kim                 size_t sent_sigslen;
2791e71b7053SJung-uk Kim 
2792e71b7053SJung-uk Kim                 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2793e71b7053SJung-uk Kim                     if (!fatalerrs)
2794e71b7053SJung-uk Kim                         return 1;
2795e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2796e71b7053SJung-uk Kim                              ERR_R_INTERNAL_ERROR);
2797e71b7053SJung-uk Kim                     return 0;
2798e71b7053SJung-uk Kim                 }
2799e71b7053SJung-uk Kim 
2800e71b7053SJung-uk Kim                 /* Check signature matches a type we sent */
2801e71b7053SJung-uk Kim                 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
2802e71b7053SJung-uk Kim                 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
2803e71b7053SJung-uk Kim                     if (lu->sigalg == *sent_sigs
2804e71b7053SJung-uk Kim                             && has_usable_cert(s, lu, lu->sig_idx))
2805e71b7053SJung-uk Kim                         break;
2806e71b7053SJung-uk Kim                 }
2807e71b7053SJung-uk Kim                 if (i == sent_sigslen) {
2808e71b7053SJung-uk Kim                     if (!fatalerrs)
2809e71b7053SJung-uk Kim                         return 1;
2810e71b7053SJung-uk Kim                     SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
2811e71b7053SJung-uk Kim                              SSL_F_TLS_CHOOSE_SIGALG,
2812e71b7053SJung-uk Kim                              SSL_R_WRONG_SIGNATURE_TYPE);
2813e71b7053SJung-uk Kim                     return 0;
2814e71b7053SJung-uk Kim                 }
2815e71b7053SJung-uk Kim             }
2816e71b7053SJung-uk Kim         } else {
2817e71b7053SJung-uk Kim             if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
2818e71b7053SJung-uk Kim                 if (!fatalerrs)
2819e71b7053SJung-uk Kim                     return 1;
2820e71b7053SJung-uk Kim                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CHOOSE_SIGALG,
2821e71b7053SJung-uk Kim                          ERR_R_INTERNAL_ERROR);
2822e71b7053SJung-uk Kim                 return 0;
2823e71b7053SJung-uk Kim             }
2824e71b7053SJung-uk Kim         }
2825e71b7053SJung-uk Kim     }
2826e71b7053SJung-uk Kim     if (sig_idx == -1)
2827e71b7053SJung-uk Kim         sig_idx = lu->sig_idx;
2828e71b7053SJung-uk Kim     s->s3->tmp.cert = &s->cert->pkeys[sig_idx];
2829e71b7053SJung-uk Kim     s->cert->key = s->s3->tmp.cert;
2830e71b7053SJung-uk Kim     s->s3->tmp.sigalg = lu;
2831e71b7053SJung-uk Kim     return 1;
2832e71b7053SJung-uk Kim }
2833e71b7053SJung-uk Kim 
2834e71b7053SJung-uk Kim int SSL_CTX_set_tlsext_max_fragment_length(SSL_CTX *ctx, uint8_t mode)
2835e71b7053SJung-uk Kim {
2836e71b7053SJung-uk Kim     if (mode != TLSEXT_max_fragment_length_DISABLED
2837e71b7053SJung-uk Kim             && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2838e71b7053SJung-uk Kim         SSLerr(SSL_F_SSL_CTX_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2839e71b7053SJung-uk Kim                SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2840e71b7053SJung-uk Kim         return 0;
2841e71b7053SJung-uk Kim     }
2842e71b7053SJung-uk Kim 
2843e71b7053SJung-uk Kim     ctx->ext.max_fragment_len_mode = mode;
2844e71b7053SJung-uk Kim     return 1;
2845e71b7053SJung-uk Kim }
2846e71b7053SJung-uk Kim 
2847e71b7053SJung-uk Kim int SSL_set_tlsext_max_fragment_length(SSL *ssl, uint8_t mode)
2848e71b7053SJung-uk Kim {
2849e71b7053SJung-uk Kim     if (mode != TLSEXT_max_fragment_length_DISABLED
2850e71b7053SJung-uk Kim             && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
2851e71b7053SJung-uk Kim         SSLerr(SSL_F_SSL_SET_TLSEXT_MAX_FRAGMENT_LENGTH,
2852e71b7053SJung-uk Kim                SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
2853e71b7053SJung-uk Kim         return 0;
2854e71b7053SJung-uk Kim     }
2855e71b7053SJung-uk Kim 
2856e71b7053SJung-uk Kim     ssl->ext.max_fragment_len_mode = mode;
2857e71b7053SJung-uk Kim     return 1;
2858e71b7053SJung-uk Kim }
2859e71b7053SJung-uk Kim 
2860e71b7053SJung-uk Kim uint8_t SSL_SESSION_get_max_fragment_length(const SSL_SESSION *session)
2861e71b7053SJung-uk Kim {
2862e71b7053SJung-uk Kim     return session->ext.max_fragment_len_mode;
2863e71b7053SJung-uk Kim }
2864