2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/objects.h>
13 #include <openssl/evp.h>
14 #include <openssl/hmac.h>
15 #include <openssl/core_names.h>
16 #include <openssl/ocsp.h>
17 #include <openssl/conf.h>
18 #include <openssl/x509v3.h>
19 #include <openssl/dh.h>
20 #include <openssl/bn.h>
21 #include <openssl/provider.h>
22 #include <openssl/param_build.h>
23 #include "internal/nelem.h"
24 #include "internal/sizes.h"
25 #include "internal/tlsgroups.h"
26 #include "ssl_local.h"
27 #include <openssl/ct.h>
29 static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey);
30 static int tls12_sigalg_allowed(const SSL *s, int op, const SIGALG_LOOKUP *lu);
32 SSL3_ENC_METHOD const TLSv1_enc_data = {
36 tls1_generate_master_secret,
37 tls1_change_cipher_state,
38 tls1_final_finish_mac,
39 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
40 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
42 tls1_export_keying_material,
44 ssl3_set_handshake_header,
45 tls_close_construct_packet,
49 SSL3_ENC_METHOD const TLSv1_1_enc_data = {
53 tls1_generate_master_secret,
54 tls1_change_cipher_state,
55 tls1_final_finish_mac,
56 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
57 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
59 tls1_export_keying_material,
60 SSL_ENC_FLAG_EXPLICIT_IV,
61 ssl3_set_handshake_header,
62 tls_close_construct_packet,
66 SSL3_ENC_METHOD const TLSv1_2_enc_data = {
70 tls1_generate_master_secret,
71 tls1_change_cipher_state,
72 tls1_final_finish_mac,
73 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
74 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
76 tls1_export_keying_material,
77 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
78 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
79 ssl3_set_handshake_header,
80 tls_close_construct_packet,
84 SSL3_ENC_METHOD const TLSv1_3_enc_data = {
87 tls13_setup_key_block,
88 tls13_generate_master_secret,
89 tls13_change_cipher_state,
90 tls13_final_finish_mac,
91 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
92 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
94 tls13_export_keying_material,
95 SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
96 ssl3_set_handshake_header,
97 tls_close_construct_packet,
101 long tls1_default_timeout(void)
104 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
105 * http, the cache would over fill
107 return (60 * 60 * 2);
114 if (!s->method->ssl_clear(s))
120 void tls1_free(SSL *s)
122 OPENSSL_free(s->ext.session_ticket);
126 int tls1_clear(SSL *s)
131 if (s->method->version == TLS_ANY_VERSION)
132 s->version = TLS_MAX_VERSION_INTERNAL;
134 s->version = s->method->version;
139 /* Legacy NID to group_id mapping. Only works for groups we know about */
144 {NID_sect163k1, OSSL_TLS_GROUP_ID_sect163k1},
145 {NID_sect163r1, OSSL_TLS_GROUP_ID_sect163r1},
146 {NID_sect163r2, OSSL_TLS_GROUP_ID_sect163r2},
147 {NID_sect193r1, OSSL_TLS_GROUP_ID_sect193r1},
148 {NID_sect193r2, OSSL_TLS_GROUP_ID_sect193r2},
149 {NID_sect233k1, OSSL_TLS_GROUP_ID_sect233k1},
150 {NID_sect233r1, OSSL_TLS_GROUP_ID_sect233r1},
151 {NID_sect239k1, OSSL_TLS_GROUP_ID_sect239k1},
152 {NID_sect283k1, OSSL_TLS_GROUP_ID_sect283k1},
153 {NID_sect283r1, OSSL_TLS_GROUP_ID_sect283r1},
154 {NID_sect409k1, OSSL_TLS_GROUP_ID_sect409k1},
155 {NID_sect409r1, OSSL_TLS_GROUP_ID_sect409r1},
156 {NID_sect571k1, OSSL_TLS_GROUP_ID_sect571k1},
157 {NID_sect571r1, OSSL_TLS_GROUP_ID_sect571r1},
158 {NID_secp160k1, OSSL_TLS_GROUP_ID_secp160k1},
159 {NID_secp160r1, OSSL_TLS_GROUP_ID_secp160r1},
160 {NID_secp160r2, OSSL_TLS_GROUP_ID_secp160r2},
161 {NID_secp192k1, OSSL_TLS_GROUP_ID_secp192k1},
162 {NID_X9_62_prime192v1, OSSL_TLS_GROUP_ID_secp192r1},
163 {NID_secp224k1, OSSL_TLS_GROUP_ID_secp224k1},
164 {NID_secp224r1, OSSL_TLS_GROUP_ID_secp224r1},
165 {NID_secp256k1, OSSL_TLS_GROUP_ID_secp256k1},
166 {NID_X9_62_prime256v1, OSSL_TLS_GROUP_ID_secp256r1},
167 {NID_secp384r1, OSSL_TLS_GROUP_ID_secp384r1},
168 {NID_secp521r1, OSSL_TLS_GROUP_ID_secp521r1},
169 {NID_brainpoolP256r1, OSSL_TLS_GROUP_ID_brainpoolP256r1},
170 {NID_brainpoolP384r1, OSSL_TLS_GROUP_ID_brainpoolP384r1},
171 {NID_brainpoolP512r1, OSSL_TLS_GROUP_ID_brainpoolP512r1},
172 {EVP_PKEY_X25519, OSSL_TLS_GROUP_ID_x25519},
173 {EVP_PKEY_X448, OSSL_TLS_GROUP_ID_x448},
174 {NID_id_tc26_gost_3410_2012_256_paramSetA, 0x0022},
175 {NID_id_tc26_gost_3410_2012_256_paramSetB, 0x0023},
176 {NID_id_tc26_gost_3410_2012_256_paramSetC, 0x0024},
177 {NID_id_tc26_gost_3410_2012_256_paramSetD, 0x0025},
178 {NID_id_tc26_gost_3410_2012_512_paramSetA, 0x0026},
179 {NID_id_tc26_gost_3410_2012_512_paramSetB, 0x0027},
180 {NID_id_tc26_gost_3410_2012_512_paramSetC, 0x0028},
181 {NID_ffdhe2048, OSSL_TLS_GROUP_ID_ffdhe2048},
182 {NID_ffdhe3072, OSSL_TLS_GROUP_ID_ffdhe3072},
183 {NID_ffdhe4096, OSSL_TLS_GROUP_ID_ffdhe4096},
184 {NID_ffdhe6144, OSSL_TLS_GROUP_ID_ffdhe6144},
185 {NID_ffdhe8192, OSSL_TLS_GROUP_ID_ffdhe8192}
188 static const unsigned char ecformats_default[] = {
189 TLSEXT_ECPOINTFORMAT_uncompressed,
190 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
191 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
194 /* The default curves */
195 static const uint16_t supported_groups_default[] = {
196 29, /* X25519 (29) */
197 23, /* secp256r1 (23) */
199 25, /* secp521r1 (25) */
200 24, /* secp384r1 (24) */
201 34, /* GC256A (34) */
202 35, /* GC256B (35) */
203 36, /* GC256C (36) */
204 37, /* GC256D (37) */
205 38, /* GC512A (38) */
206 39, /* GC512B (39) */
207 40, /* GC512C (40) */
208 0x100, /* ffdhe2048 (0x100) */
209 0x101, /* ffdhe3072 (0x101) */
210 0x102, /* ffdhe4096 (0x102) */
211 0x103, /* ffdhe6144 (0x103) */
212 0x104, /* ffdhe8192 (0x104) */
215 static const uint16_t suiteb_curves[] = {
220 struct provider_group_data_st {
222 OSSL_PROVIDER *provider;
225 #define TLS_GROUP_LIST_MALLOC_BLOCK_SIZE 10
226 static OSSL_CALLBACK add_provider_groups;
227 static int add_provider_groups(const OSSL_PARAM params[], void *data)
229 struct provider_group_data_st *pgd = data;
230 SSL_CTX *ctx = pgd->ctx;
231 OSSL_PROVIDER *provider = pgd->provider;
233 TLS_GROUP_INFO *ginf = NULL;
234 EVP_KEYMGMT *keymgmt;
236 unsigned int is_kem = 0;
239 if (ctx->group_list_max_len == ctx->group_list_len) {
240 TLS_GROUP_INFO *tmp = NULL;
242 if (ctx->group_list_max_len == 0)
243 tmp = OPENSSL_malloc(sizeof(TLS_GROUP_INFO)
244 * TLS_GROUP_LIST_MALLOC_BLOCK_SIZE);
246 tmp = OPENSSL_realloc(ctx->group_list,
247 (ctx->group_list_max_len
248 + TLS_GROUP_LIST_MALLOC_BLOCK_SIZE)
249 * sizeof(TLS_GROUP_INFO));
251 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
254 ctx->group_list = tmp;
255 memset(tmp + ctx->group_list_max_len,
257 sizeof(TLS_GROUP_INFO) * TLS_GROUP_LIST_MALLOC_BLOCK_SIZE);
258 ctx->group_list_max_len += TLS_GROUP_LIST_MALLOC_BLOCK_SIZE;
261 ginf = &ctx->group_list[ctx->group_list_len];
263 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_NAME);
264 if (p == NULL || p->data_type != OSSL_PARAM_UTF8_STRING) {
265 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
268 ginf->tlsname = OPENSSL_strdup(p->data);
269 if (ginf->tlsname == NULL) {
270 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
274 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_NAME_INTERNAL);
275 if (p == NULL || p->data_type != OSSL_PARAM_UTF8_STRING) {
276 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
279 ginf->realname = OPENSSL_strdup(p->data);
280 if (ginf->realname == NULL) {
281 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
285 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_ID);
286 if (p == NULL || !OSSL_PARAM_get_uint(p, &gid) || gid > UINT16_MAX) {
287 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
290 ginf->group_id = (uint16_t)gid;
292 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_ALG);
293 if (p == NULL || p->data_type != OSSL_PARAM_UTF8_STRING) {
294 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
297 ginf->algorithm = OPENSSL_strdup(p->data);
298 if (ginf->algorithm == NULL) {
299 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
303 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_SECURITY_BITS);
304 if (p == NULL || !OSSL_PARAM_get_uint(p, &ginf->secbits)) {
305 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
309 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_IS_KEM);
310 if (p != NULL && (!OSSL_PARAM_get_uint(p, &is_kem) || is_kem > 1)) {
311 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
314 ginf->is_kem = 1 & is_kem;
316 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_MIN_TLS);
317 if (p == NULL || !OSSL_PARAM_get_int(p, &ginf->mintls)) {
318 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
322 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_MAX_TLS);
323 if (p == NULL || !OSSL_PARAM_get_int(p, &ginf->maxtls)) {
324 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
328 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_MIN_DTLS);
329 if (p == NULL || !OSSL_PARAM_get_int(p, &ginf->mindtls)) {
330 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
334 p = OSSL_PARAM_locate_const(params, OSSL_CAPABILITY_TLS_GROUP_MAX_DTLS);
335 if (p == NULL || !OSSL_PARAM_get_int(p, &ginf->maxdtls)) {
336 ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
340 * Now check that the algorithm is actually usable for our property query
341 * string. Regardless of the result we still return success because we have
342 * successfully processed this group, even though we may decide not to use
346 keymgmt = EVP_KEYMGMT_fetch(ctx->libctx, ginf->algorithm, ctx->propq);
347 if (keymgmt != NULL) {
349 * We have successfully fetched the algorithm - however if the provider
350 * doesn't match this one then we ignore it.
352 * Note: We're cheating a little here. Technically if the same algorithm
353 * is available from more than one provider then it is undefined which
354 * implementation you will get back. Theoretically this could be
355 * different every time...we assume here that you'll always get the
356 * same one back if you repeat the exact same fetch. Is this a reasonable
357 * assumption to make (in which case perhaps we should document this
360 if (EVP_KEYMGMT_provider(keymgmt) == provider) {
361 /* We have a match - so we will use this group */
362 ctx->group_list_len++;
365 EVP_KEYMGMT_free(keymgmt);
369 OPENSSL_free(ginf->tlsname);
370 OPENSSL_free(ginf->realname);
371 OPENSSL_free(ginf->algorithm);
372 ginf->tlsname = ginf->realname = NULL;
377 static int discover_provider_groups(OSSL_PROVIDER *provider, void *vctx)
379 struct provider_group_data_st pgd;
382 pgd.provider = provider;
383 return OSSL_PROVIDER_get_capabilities(provider, "TLS-GROUP",
384 add_provider_groups, &pgd);
387 int ssl_load_groups(SSL_CTX *ctx)
389 size_t i, j, num_deflt_grps = 0;
390 uint16_t tmp_supp_groups[OSSL_NELEM(supported_groups_default)];
392 if (!OSSL_PROVIDER_do_all(ctx->libctx, discover_provider_groups, ctx))
395 for (i = 0; i < OSSL_NELEM(supported_groups_default); i++) {
396 for (j = 0; j < ctx->group_list_len; j++) {
397 if (ctx->group_list[j].group_id == supported_groups_default[i]) {
398 tmp_supp_groups[num_deflt_grps++] = ctx->group_list[j].group_id;
404 if (num_deflt_grps == 0)
407 ctx->ext.supported_groups_default
408 = OPENSSL_malloc(sizeof(uint16_t) * num_deflt_grps);
410 if (ctx->ext.supported_groups_default == NULL) {
411 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
415 memcpy(ctx->ext.supported_groups_default,
417 num_deflt_grps * sizeof(tmp_supp_groups[0]));
418 ctx->ext.supported_groups_default_len = num_deflt_grps;
423 static uint16_t tls1_group_name2id(SSL_CTX *ctx, const char *name)
427 for (i = 0; i < ctx->group_list_len; i++) {
428 if (strcmp(ctx->group_list[i].tlsname, name) == 0
429 || strcmp(ctx->group_list[i].realname, name) == 0)
430 return ctx->group_list[i].group_id;
436 const TLS_GROUP_INFO *tls1_group_id_lookup(SSL_CTX *ctx, uint16_t group_id)
440 for (i = 0; i < ctx->group_list_len; i++) {
441 if (ctx->group_list[i].group_id == group_id)
442 return &ctx->group_list[i];
448 int tls1_group_id2nid(uint16_t group_id, int include_unknown)
456 * Return well known Group NIDs - for backwards compatibility. This won't
457 * work for groups we don't know about.
459 for (i = 0; i < OSSL_NELEM(nid_to_group); i++)
461 if (nid_to_group[i].group_id == group_id)
462 return nid_to_group[i].nid;
464 if (!include_unknown)
466 return TLSEXT_nid_unknown | (int)group_id;
469 uint16_t tls1_nid2group_id(int nid)
474 * Return well known Group ids - for backwards compatibility. This won't
475 * work for groups we don't know about.
477 for (i = 0; i < OSSL_NELEM(nid_to_group); i++)
479 if (nid_to_group[i].nid == nid)
480 return nid_to_group[i].group_id;
487 * Set *pgroups to the supported groups list and *pgroupslen to
488 * the number of groups supported.
490 void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
493 /* For Suite B mode only include P-256, P-384 */
494 switch (tls1_suiteb(s)) {
495 case SSL_CERT_FLAG_SUITEB_128_LOS:
496 *pgroups = suiteb_curves;
497 *pgroupslen = OSSL_NELEM(suiteb_curves);
500 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
501 *pgroups = suiteb_curves;
505 case SSL_CERT_FLAG_SUITEB_192_LOS:
506 *pgroups = suiteb_curves + 1;
511 if (s->ext.supportedgroups == NULL) {
512 *pgroups = s->ctx->ext.supported_groups_default;
513 *pgroupslen = s->ctx->ext.supported_groups_default_len;
515 *pgroups = s->ext.supportedgroups;
516 *pgroupslen = s->ext.supportedgroups_len;
522 int tls_valid_group(SSL *s, uint16_t group_id, int minversion, int maxversion,
523 int isec, int *okfortls13)
525 const TLS_GROUP_INFO *ginfo = tls1_group_id_lookup(s->ctx, group_id);
528 if (okfortls13 != NULL)
534 if (SSL_IS_DTLS(s)) {
535 if (ginfo->mindtls < 0 || ginfo->maxdtls < 0)
537 if (ginfo->maxdtls == 0)
540 ret = DTLS_VERSION_LE(minversion, ginfo->maxdtls);
541 if (ginfo->mindtls > 0)
542 ret &= DTLS_VERSION_GE(maxversion, ginfo->mindtls);
544 if (ginfo->mintls < 0 || ginfo->maxtls < 0)
546 if (ginfo->maxtls == 0)
549 ret = (minversion <= ginfo->maxtls);
550 if (ginfo->mintls > 0)
551 ret &= (maxversion >= ginfo->mintls);
552 if (ret && okfortls13 != NULL && maxversion == TLS1_3_VERSION)
553 *okfortls13 = (ginfo->maxtls == 0)
554 || (ginfo->maxtls >= TLS1_3_VERSION);
557 || strcmp(ginfo->algorithm, "EC") == 0
558 || strcmp(ginfo->algorithm, "X25519") == 0
559 || strcmp(ginfo->algorithm, "X448") == 0;
564 /* See if group is allowed by security callback */
565 int tls_group_allowed(SSL *s, uint16_t group, int op)
567 const TLS_GROUP_INFO *ginfo = tls1_group_id_lookup(s->ctx, group);
568 unsigned char gtmp[2];
573 gtmp[0] = group >> 8;
574 gtmp[1] = group & 0xff;
575 return ssl_security(s, op, ginfo->secbits,
576 tls1_group_id2nid(ginfo->group_id, 0), (void *)gtmp);
579 /* Return 1 if "id" is in "list" */
580 static int tls1_in_list(uint16_t id, const uint16_t *list, size_t listlen)
583 for (i = 0; i < listlen; i++)
590 * For nmatch >= 0, return the id of the |nmatch|th shared group or 0
591 * if there is no match.
592 * For nmatch == -1, return number of matches
593 * For nmatch == -2, return the id of the group to use for
594 * a tmp key, or 0 if there is no match.
596 uint16_t tls1_shared_group(SSL *s, int nmatch)
598 const uint16_t *pref, *supp;
599 size_t num_pref, num_supp, i;
602 /* Can't do anything on client side */
606 if (tls1_suiteb(s)) {
608 * For Suite B ciphersuite determines curve: we already know
609 * these are acceptable due to previous checks.
611 unsigned long cid = s->s3.tmp.new_cipher->id;
613 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
614 return TLSEXT_curve_P_256;
615 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
616 return TLSEXT_curve_P_384;
617 /* Should never happen */
620 /* If not Suite B just return first preference shared curve */
624 * If server preference set, our groups are the preference order
625 * otherwise peer decides.
627 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
628 tls1_get_supported_groups(s, &pref, &num_pref);
629 tls1_get_peer_groups(s, &supp, &num_supp);
631 tls1_get_peer_groups(s, &pref, &num_pref);
632 tls1_get_supported_groups(s, &supp, &num_supp);
635 for (k = 0, i = 0; i < num_pref; i++) {
636 uint16_t id = pref[i];
638 if (!tls1_in_list(id, supp, num_supp)
639 || !tls_group_allowed(s, id, SSL_SECOP_CURVE_SHARED))
647 /* Out of range (nmatch > k). */
651 int tls1_set_groups(uint16_t **pext, size_t *pextlen,
652 int *groups, size_t ngroups)
657 * Bitmap of groups included to detect duplicates: two variables are added
658 * to detect duplicates as some values are more than 32.
660 unsigned long *dup_list = NULL;
661 unsigned long dup_list_egrp = 0;
662 unsigned long dup_list_dhgrp = 0;
665 ERR_raise(ERR_LIB_SSL, SSL_R_BAD_LENGTH);
668 if ((glist = OPENSSL_malloc(ngroups * sizeof(*glist))) == NULL) {
669 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
672 for (i = 0; i < ngroups; i++) {
673 unsigned long idmask;
675 id = tls1_nid2group_id(groups[i]);
676 if ((id & 0x00FF) >= (sizeof(unsigned long) * 8))
678 idmask = 1L << (id & 0x00FF);
679 dup_list = (id < 0x100) ? &dup_list_egrp : &dup_list_dhgrp;
680 if (!id || ((*dup_list) & idmask))
694 /* TODO(3.0): An arbitrary amount for now. Take another look at this */
695 # define MAX_GROUPLIST 40
700 uint16_t gid_arr[MAX_GROUPLIST];
703 static int gid_cb(const char *elem, int len, void *arg)
705 gid_cb_st *garg = arg;
712 if (garg->gidcnt == MAX_GROUPLIST)
714 if (len > (int)(sizeof(etmp) - 1))
716 memcpy(etmp, elem, len);
719 gid = tls1_group_name2id(garg->ctx, etmp);
722 for (i = 0; i < garg->gidcnt; i++)
723 if (garg->gid_arr[i] == gid)
725 garg->gid_arr[garg->gidcnt++] = gid;
729 /* Set groups based on a colon separated list */
730 int tls1_set_groups_list(SSL_CTX *ctx, uint16_t **pext, size_t *pextlen,
738 if (!CONF_parse_list(str, ':', 1, gid_cb, &gcb))
744 * gid_cb ensurse there are no duplicates so we can just go ahead and set
747 tmparr = OPENSSL_memdup(gcb.gid_arr, gcb.gidcnt * sizeof(*tmparr));
751 *pextlen = gcb.gidcnt;
755 /* Check a group id matches preferences */
756 int tls1_check_group_id(SSL *s, uint16_t group_id, int check_own_groups)
758 const uint16_t *groups;
764 /* Check for Suite B compliance */
765 if (tls1_suiteb(s) && s->s3.tmp.new_cipher != NULL) {
766 unsigned long cid = s->s3.tmp.new_cipher->id;
768 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
769 if (group_id != TLSEXT_curve_P_256)
771 } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
772 if (group_id != TLSEXT_curve_P_384)
775 /* Should never happen */
780 if (check_own_groups) {
781 /* Check group is one of our preferences */
782 tls1_get_supported_groups(s, &groups, &groups_len);
783 if (!tls1_in_list(group_id, groups, groups_len))
787 if (!tls_group_allowed(s, group_id, SSL_SECOP_CURVE_CHECK))
790 /* For clients, nothing more to check */
794 /* Check group is one of peers preferences */
795 tls1_get_peer_groups(s, &groups, &groups_len);
798 * RFC 4492 does not require the supported elliptic curves extension
799 * so if it is not sent we can just choose any curve.
800 * It is invalid to send an empty list in the supported groups
801 * extension, so groups_len == 0 always means no extension.
805 return tls1_in_list(group_id, groups, groups_len);
808 void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
812 * If we have a custom point format list use it otherwise use default
814 if (s->ext.ecpointformats) {
815 *pformats = s->ext.ecpointformats;
816 *num_formats = s->ext.ecpointformats_len;
818 *pformats = ecformats_default;
819 /* For Suite B we don't support char2 fields */
821 *num_formats = sizeof(ecformats_default) - 1;
823 *num_formats = sizeof(ecformats_default);
827 /* Check a key is compatible with compression extension */
828 static int tls1_check_pkey_comp(SSL *s, EVP_PKEY *pkey)
830 unsigned char comp_id;
834 /* If not an EC key nothing to check */
835 if (!EVP_PKEY_is_a(pkey, "EC"))
839 /* Get required compression id */
840 point_conv = EVP_PKEY_get_ec_point_conv_form(pkey);
843 if (point_conv == POINT_CONVERSION_UNCOMPRESSED) {
844 comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
845 } else if (SSL_IS_TLS13(s)) {
847 * ec_point_formats extension is not used in TLSv1.3 so we ignore
852 int field_type = EVP_PKEY_get_field_type(pkey);
854 if (field_type == NID_X9_62_prime_field)
855 comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
856 else if (field_type == NID_X9_62_characteristic_two_field)
857 comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
862 * If point formats extension present check it, otherwise everything is
863 * supported (see RFC4492).
865 if (s->ext.peer_ecpointformats == NULL)
868 for (i = 0; i < s->ext.peer_ecpointformats_len; i++) {
869 if (s->ext.peer_ecpointformats[i] == comp_id)
875 /* Return group id of a key */
876 static uint16_t tls1_get_group_id(EVP_PKEY *pkey)
878 int curve_nid = ssl_get_EC_curve_nid(pkey);
880 if (curve_nid == NID_undef)
882 return tls1_nid2group_id(curve_nid);
886 * Check cert parameters compatible with extensions: currently just checks EC
887 * certificates have compatible curves and compression.
889 static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
893 pkey = X509_get0_pubkey(x);
896 /* If not EC nothing to do */
897 if (!EVP_PKEY_is_a(pkey, "EC"))
899 /* Check compression */
900 if (!tls1_check_pkey_comp(s, pkey))
902 group_id = tls1_get_group_id(pkey);
904 * For a server we allow the certificate to not be in our list of supported
907 if (!tls1_check_group_id(s, group_id, !s->server))
910 * Special case for suite B. We *MUST* sign using SHA256+P-256 or
913 if (check_ee_md && tls1_suiteb(s)) {
917 /* Check to see we have necessary signing algorithm */
918 if (group_id == TLSEXT_curve_P_256)
919 check_md = NID_ecdsa_with_SHA256;
920 else if (group_id == TLSEXT_curve_P_384)
921 check_md = NID_ecdsa_with_SHA384;
923 return 0; /* Should never happen */
924 for (i = 0; i < s->shared_sigalgslen; i++) {
925 if (check_md == s->shared_sigalgs[i]->sigandhash)
934 * tls1_check_ec_tmp_key - Check EC temporary key compatibility
936 * @cid: Cipher ID we're considering using
938 * Checks that the kECDHE cipher suite we're considering using
939 * is compatible with the client extensions.
941 * Returns 0 when the cipher can't be used or 1 when it can.
943 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
945 /* If not Suite B just need a shared group */
947 return tls1_shared_group(s, 0) != 0;
949 * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
952 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
953 return tls1_check_group_id(s, TLSEXT_curve_P_256, 1);
954 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
955 return tls1_check_group_id(s, TLSEXT_curve_P_384, 1);
960 /* Default sigalg schemes */
961 static const uint16_t tls12_sigalgs[] = {
962 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
963 TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
964 TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
965 TLSEXT_SIGALG_ed25519,
968 TLSEXT_SIGALG_rsa_pss_pss_sha256,
969 TLSEXT_SIGALG_rsa_pss_pss_sha384,
970 TLSEXT_SIGALG_rsa_pss_pss_sha512,
971 TLSEXT_SIGALG_rsa_pss_rsae_sha256,
972 TLSEXT_SIGALG_rsa_pss_rsae_sha384,
973 TLSEXT_SIGALG_rsa_pss_rsae_sha512,
975 TLSEXT_SIGALG_rsa_pkcs1_sha256,
976 TLSEXT_SIGALG_rsa_pkcs1_sha384,
977 TLSEXT_SIGALG_rsa_pkcs1_sha512,
979 TLSEXT_SIGALG_ecdsa_sha224,
980 TLSEXT_SIGALG_ecdsa_sha1,
982 TLSEXT_SIGALG_rsa_pkcs1_sha224,
983 TLSEXT_SIGALG_rsa_pkcs1_sha1,
985 TLSEXT_SIGALG_dsa_sha224,
986 TLSEXT_SIGALG_dsa_sha1,
988 TLSEXT_SIGALG_dsa_sha256,
989 TLSEXT_SIGALG_dsa_sha384,
990 TLSEXT_SIGALG_dsa_sha512,
992 #ifndef OPENSSL_NO_GOST
993 TLSEXT_SIGALG_gostr34102012_256_intrinsic,
994 TLSEXT_SIGALG_gostr34102012_512_intrinsic,
995 TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
996 TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
997 TLSEXT_SIGALG_gostr34102001_gostr3411,
1002 static const uint16_t suiteb_sigalgs[] = {
1003 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
1004 TLSEXT_SIGALG_ecdsa_secp384r1_sha384
1007 static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
1008 {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
1009 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
1010 NID_ecdsa_with_SHA256, NID_X9_62_prime256v1, 1},
1011 {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
1012 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
1013 NID_ecdsa_with_SHA384, NID_secp384r1, 1},
1014 {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
1015 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
1016 NID_ecdsa_with_SHA512, NID_secp521r1, 1},
1017 {"ed25519", TLSEXT_SIGALG_ed25519,
1018 NID_undef, -1, EVP_PKEY_ED25519, SSL_PKEY_ED25519,
1019 NID_undef, NID_undef, 1},
1020 {"ed448", TLSEXT_SIGALG_ed448,
1021 NID_undef, -1, EVP_PKEY_ED448, SSL_PKEY_ED448,
1022 NID_undef, NID_undef, 1},
1023 {NULL, TLSEXT_SIGALG_ecdsa_sha224,
1024 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
1025 NID_ecdsa_with_SHA224, NID_undef, 1},
1026 {NULL, TLSEXT_SIGALG_ecdsa_sha1,
1027 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
1028 NID_ecdsa_with_SHA1, NID_undef, 1},
1029 {"rsa_pss_rsae_sha256", TLSEXT_SIGALG_rsa_pss_rsae_sha256,
1030 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
1031 NID_undef, NID_undef, 1},
1032 {"rsa_pss_rsae_sha384", TLSEXT_SIGALG_rsa_pss_rsae_sha384,
1033 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
1034 NID_undef, NID_undef, 1},
1035 {"rsa_pss_rsae_sha512", TLSEXT_SIGALG_rsa_pss_rsae_sha512,
1036 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA,
1037 NID_undef, NID_undef, 1},
1038 {"rsa_pss_pss_sha256", TLSEXT_SIGALG_rsa_pss_pss_sha256,
1039 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
1040 NID_undef, NID_undef, 1},
1041 {"rsa_pss_pss_sha384", TLSEXT_SIGALG_rsa_pss_pss_sha384,
1042 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
1043 NID_undef, NID_undef, 1},
1044 {"rsa_pss_pss_sha512", TLSEXT_SIGALG_rsa_pss_pss_sha512,
1045 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
1046 NID_undef, NID_undef, 1},
1047 {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
1048 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
1049 NID_sha256WithRSAEncryption, NID_undef, 1},
1050 {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
1051 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
1052 NID_sha384WithRSAEncryption, NID_undef, 1},
1053 {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
1054 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
1055 NID_sha512WithRSAEncryption, NID_undef, 1},
1056 {"rsa_pkcs1_sha224", TLSEXT_SIGALG_rsa_pkcs1_sha224,
1057 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
1058 NID_sha224WithRSAEncryption, NID_undef, 1},
1059 {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
1060 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
1061 NID_sha1WithRSAEncryption, NID_undef, 1},
1062 {NULL, TLSEXT_SIGALG_dsa_sha256,
1063 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
1064 NID_dsa_with_SHA256, NID_undef, 1},
1065 {NULL, TLSEXT_SIGALG_dsa_sha384,
1066 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
1067 NID_undef, NID_undef, 1},
1068 {NULL, TLSEXT_SIGALG_dsa_sha512,
1069 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
1070 NID_undef, NID_undef, 1},
1071 {NULL, TLSEXT_SIGALG_dsa_sha224,
1072 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
1073 NID_undef, NID_undef, 1},
1074 {NULL, TLSEXT_SIGALG_dsa_sha1,
1075 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
1076 NID_dsaWithSHA1, NID_undef, 1},
1077 #ifndef OPENSSL_NO_GOST
1078 {NULL, TLSEXT_SIGALG_gostr34102012_256_intrinsic,
1079 NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
1080 NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
1081 NID_undef, NID_undef, 1},
1082 {NULL, TLSEXT_SIGALG_gostr34102012_512_intrinsic,
1083 NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
1084 NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
1085 NID_undef, NID_undef, 1},
1086 {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
1087 NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
1088 NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
1089 NID_undef, NID_undef, 1},
1090 {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
1091 NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
1092 NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
1093 NID_undef, NID_undef, 1},
1094 {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
1095 NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
1096 NID_id_GostR3410_2001, SSL_PKEY_GOST01,
1097 NID_undef, NID_undef, 1}
1100 /* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
1101 static const SIGALG_LOOKUP legacy_rsa_sigalg = {
1102 "rsa_pkcs1_md5_sha1", 0,
1103 NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
1104 EVP_PKEY_RSA, SSL_PKEY_RSA,
1105 NID_undef, NID_undef, 1
1109 * Default signature algorithm values used if signature algorithms not present.
1110 * From RFC5246. Note: order must match certificate index order.
1112 static const uint16_t tls_default_sigalg[] = {
1113 TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
1114 0, /* SSL_PKEY_RSA_PSS_SIGN */
1115 TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
1116 TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
1117 TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
1118 TLSEXT_SIGALG_gostr34102012_256_intrinsic, /* SSL_PKEY_GOST12_256 */
1119 TLSEXT_SIGALG_gostr34102012_512_intrinsic, /* SSL_PKEY_GOST12_512 */
1120 0, /* SSL_PKEY_ED25519 */
1121 0, /* SSL_PKEY_ED448 */
1124 int ssl_setup_sig_algs(SSL_CTX *ctx)
1127 const SIGALG_LOOKUP *lu;
1128 SIGALG_LOOKUP *cache
1129 = OPENSSL_malloc(sizeof(*lu) * OSSL_NELEM(sigalg_lookup_tbl));
1130 EVP_PKEY *tmpkey = EVP_PKEY_new();
1133 if (cache == NULL || tmpkey == NULL)
1137 for (i = 0, lu = sigalg_lookup_tbl;
1138 i < OSSL_NELEM(sigalg_lookup_tbl); lu++, i++) {
1144 * Check hash is available.
1145 * TODO(3.0): This test is not perfect. A provider could have support
1146 * for a signature scheme, but not a particular hash. However the hash
1147 * could be available from some other loaded provider. In that case it
1148 * could be that the signature is available, and the hash is available
1149 * independently - but not as a combination. We ignore this for now.
1151 if (lu->hash != NID_undef
1152 && ctx->ssl_digest_methods[lu->hash_idx] == NULL) {
1153 cache[i].enabled = 0;
1157 if (!EVP_PKEY_set_type(tmpkey, lu->sig)) {
1158 cache[i].enabled = 0;
1161 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, tmpkey, ctx->propq);
1162 /* If unable to create pctx we assume the sig algorithm is unavailable */
1164 cache[i].enabled = 0;
1165 EVP_PKEY_CTX_free(pctx);
1168 ctx->sigalg_lookup_cache = cache;
1173 OPENSSL_free(cache);
1174 EVP_PKEY_free(tmpkey);
1178 /* Lookup TLS signature algorithm */
1179 static const SIGALG_LOOKUP *tls1_lookup_sigalg(const SSL *s, uint16_t sigalg)
1182 const SIGALG_LOOKUP *lu;
1184 for (i = 0, lu = s->ctx->sigalg_lookup_cache;
1185 /* cache should have the same number of elements as sigalg_lookup_tbl */
1186 i < OSSL_NELEM(sigalg_lookup_tbl);
1188 if (lu->sigalg == sigalg) {
1196 /* Lookup hash: return 0 if invalid or not enabled */
1197 int tls1_lookup_md(SSL_CTX *ctx, const SIGALG_LOOKUP *lu, const EVP_MD **pmd)
1202 /* lu->hash == NID_undef means no associated digest */
1203 if (lu->hash == NID_undef) {
1206 md = ssl_md(ctx, lu->hash_idx);
1216 * Check if key is large enough to generate RSA-PSS signature.
1218 * The key must greater than or equal to 2 * hash length + 2.
1219 * SHA512 has a hash length of 64 bytes, which is incompatible
1220 * with a 128 byte (1024 bit) key.
1222 #define RSA_PSS_MINIMUM_KEY_SIZE(md) (2 * EVP_MD_size(md) + 2)
1223 static int rsa_pss_check_min_key_size(SSL_CTX *ctx, const EVP_PKEY *pkey,
1224 const SIGALG_LOOKUP *lu)
1230 if (!tls1_lookup_md(ctx, lu, &md) || md == NULL)
1232 if (EVP_PKEY_size(pkey) < RSA_PSS_MINIMUM_KEY_SIZE(md))
1238 * Returns a signature algorithm when the peer did not send a list of supported
1239 * signature algorithms. The signature algorithm is fixed for the certificate
1240 * type. |idx| is a certificate type index (SSL_PKEY_*). When |idx| is -1 the
1241 * certificate type from |s| will be used.
1242 * Returns the signature algorithm to use, or NULL on error.
1244 static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
1250 /* Work out index corresponding to ciphersuite */
1251 for (i = 0; i < SSL_PKEY_NUM; i++) {
1252 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(i);
1254 if (clu->amask & s->s3.tmp.new_cipher->algorithm_auth) {
1261 * Some GOST ciphersuites allow more than one signature algorithms
1263 if (idx == SSL_PKEY_GOST01 && s->s3.tmp.new_cipher->algorithm_auth != SSL_aGOST01) {
1266 for (real_idx = SSL_PKEY_GOST12_512; real_idx >= SSL_PKEY_GOST01;
1268 if (s->cert->pkeys[real_idx].privatekey != NULL) {
1275 * As both SSL_PKEY_GOST12_512 and SSL_PKEY_GOST12_256 indices can be used
1276 * with new (aGOST12-only) ciphersuites, we should find out which one is available really.
1278 else if (idx == SSL_PKEY_GOST12_256) {
1281 for (real_idx = SSL_PKEY_GOST12_512; real_idx >= SSL_PKEY_GOST12_256;
1283 if (s->cert->pkeys[real_idx].privatekey != NULL) {
1290 idx = s->cert->key - s->cert->pkeys;
1293 if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
1295 if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
1296 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, tls_default_sigalg[idx]);
1300 if (!tls1_lookup_md(s->ctx, lu, NULL))
1302 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
1306 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, &legacy_rsa_sigalg))
1308 return &legacy_rsa_sigalg;
1310 /* Set peer sigalg based key type */
1311 int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
1314 const SIGALG_LOOKUP *lu;
1316 if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
1318 lu = tls1_get_legacy_sigalg(s, idx);
1321 s->s3.tmp.peer_sigalg = lu;
1325 size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
1328 * If Suite B mode use Suite B sigalgs only, ignore any other
1331 switch (tls1_suiteb(s)) {
1332 case SSL_CERT_FLAG_SUITEB_128_LOS:
1333 *psigs = suiteb_sigalgs;
1334 return OSSL_NELEM(suiteb_sigalgs);
1336 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
1337 *psigs = suiteb_sigalgs;
1340 case SSL_CERT_FLAG_SUITEB_192_LOS:
1341 *psigs = suiteb_sigalgs + 1;
1345 * We use client_sigalgs (if not NULL) if we're a server
1346 * and sending a certificate request or if we're a client and
1347 * determining which shared algorithm to use.
1349 if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
1350 *psigs = s->cert->client_sigalgs;
1351 return s->cert->client_sigalgslen;
1352 } else if (s->cert->conf_sigalgs) {
1353 *psigs = s->cert->conf_sigalgs;
1354 return s->cert->conf_sigalgslen;
1356 *psigs = tls12_sigalgs;
1357 return OSSL_NELEM(tls12_sigalgs);
1362 * Called by servers only. Checks that we have a sig alg that supports the
1363 * specified EC curve.
1365 int tls_check_sigalg_curve(const SSL *s, int curve)
1367 const uint16_t *sigs;
1370 if (s->cert->conf_sigalgs) {
1371 sigs = s->cert->conf_sigalgs;
1372 siglen = s->cert->conf_sigalgslen;
1374 sigs = tls12_sigalgs;
1375 siglen = OSSL_NELEM(tls12_sigalgs);
1378 for (i = 0; i < siglen; i++) {
1379 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, sigs[i]);
1383 if (lu->sig == EVP_PKEY_EC
1384 && lu->curve != NID_undef
1385 && curve == lu->curve)
1393 * Return the number of security bits for the signature algorithm, or 0 on
1396 static int sigalg_security_bits(SSL_CTX *ctx, const SIGALG_LOOKUP *lu)
1398 const EVP_MD *md = NULL;
1401 if (!tls1_lookup_md(ctx, lu, &md))
1405 int md_type = EVP_MD_type(md);
1407 /* Security bits: half digest bits */
1408 secbits = EVP_MD_size(md) * 4;
1410 * SHA1 and MD5 are known to be broken. Reduce security bits so that
1411 * they're no longer accepted at security level 1. The real values don't
1412 * really matter as long as they're lower than 80, which is our
1414 * https://eprint.iacr.org/2020/014 puts a chosen-prefix attack for
1415 * SHA1 at 2^63.4 and MD5+SHA1 at 2^67.2
1416 * https://documents.epfl.ch/users/l/le/lenstra/public/papers/lat.pdf
1417 * puts a chosen-prefix attack for MD5 at 2^39.
1419 if (md_type == NID_sha1)
1421 else if (md_type == NID_md5_sha1)
1423 else if (md_type == NID_md5)
1426 /* Values from https://tools.ietf.org/html/rfc8032#section-8.5 */
1427 if (lu->sigalg == TLSEXT_SIGALG_ed25519)
1429 else if (lu->sigalg == TLSEXT_SIGALG_ed448)
1436 * Check signature algorithm is consistent with sent supported signature
1437 * algorithms and if so set relevant digest and signature scheme in
1440 int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
1442 const uint16_t *sent_sigs;
1443 const EVP_MD *md = NULL;
1445 size_t sent_sigslen, i, cidx;
1447 const SIGALG_LOOKUP *lu;
1450 pkeyid = EVP_PKEY_id(pkey);
1451 /* Should never happen */
1454 if (SSL_IS_TLS13(s)) {
1455 /* Disallow DSA for TLS 1.3 */
1456 if (pkeyid == EVP_PKEY_DSA) {
1457 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_SIGNATURE_TYPE);
1460 /* Only allow PSS for TLS 1.3 */
1461 if (pkeyid == EVP_PKEY_RSA)
1462 pkeyid = EVP_PKEY_RSA_PSS;
1464 lu = tls1_lookup_sigalg(s, sig);
1466 * Check sigalgs is known. Disallow SHA1/SHA224 with TLS 1.3. Check key type
1467 * is consistent with signature: RSA keys can be used for RSA-PSS
1470 || (SSL_IS_TLS13(s) && (lu->hash == NID_sha1 || lu->hash == NID_sha224))
1471 || (pkeyid != lu->sig
1472 && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
1473 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_SIGNATURE_TYPE);
1476 /* Check the sigalg is consistent with the key OID */
1477 if (!ssl_cert_lookup_by_nid(EVP_PKEY_id(pkey), &cidx)
1478 || lu->sig_idx != (int)cidx) {
1479 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_SIGNATURE_TYPE);
1483 if (pkeyid == EVP_PKEY_EC) {
1485 /* Check point compression is permitted */
1486 if (!tls1_check_pkey_comp(s, pkey)) {
1487 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1488 SSL_R_ILLEGAL_POINT_COMPRESSION);
1492 /* For TLS 1.3 or Suite B check curve matches signature algorithm */
1493 if (SSL_IS_TLS13(s) || tls1_suiteb(s)) {
1494 int curve = ssl_get_EC_curve_nid(pkey);
1496 if (lu->curve != NID_undef && curve != lu->curve) {
1497 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CURVE);
1501 if (!SSL_IS_TLS13(s)) {
1502 /* Check curve matches extensions */
1503 if (!tls1_check_group_id(s, tls1_get_group_id(pkey), 1)) {
1504 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CURVE);
1507 if (tls1_suiteb(s)) {
1508 /* Check sigalg matches a permissible Suite B value */
1509 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
1510 && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
1511 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1512 SSL_R_WRONG_SIGNATURE_TYPE);
1517 } else if (tls1_suiteb(s)) {
1518 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_WRONG_SIGNATURE_TYPE);
1522 /* Check signature matches a type we sent */
1523 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1524 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
1525 if (sig == *sent_sigs)
1528 /* Allow fallback to SHA1 if not strict mode */
1529 if (i == sent_sigslen && (lu->hash != NID_sha1
1530 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
1531 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_WRONG_SIGNATURE_TYPE);
1534 if (!tls1_lookup_md(s->ctx, lu, &md)) {
1535 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_UNKNOWN_DIGEST);
1539 * Make sure security callback allows algorithm. For historical
1540 * reasons we have to pass the sigalg as a two byte char array.
1542 sigalgstr[0] = (sig >> 8) & 0xff;
1543 sigalgstr[1] = sig & 0xff;
1544 secbits = sigalg_security_bits(s->ctx, lu);
1546 !ssl_security(s, SSL_SECOP_SIGALG_CHECK, secbits,
1547 md != NULL ? EVP_MD_type(md) : NID_undef,
1548 (void *)sigalgstr)) {
1549 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_WRONG_SIGNATURE_TYPE);
1552 /* Store the sigalg the peer uses */
1553 s->s3.tmp.peer_sigalg = lu;
1557 int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
1559 if (s->s3.tmp.peer_sigalg == NULL)
1561 *pnid = s->s3.tmp.peer_sigalg->sig;
1565 int SSL_get_signature_type_nid(const SSL *s, int *pnid)
1567 if (s->s3.tmp.sigalg == NULL)
1569 *pnid = s->s3.tmp.sigalg->sig;
1574 * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1575 * supported, doesn't appear in supported signature algorithms, isn't supported
1576 * by the enabled protocol versions or by the security level.
1578 * This function should only be used for checking which ciphers are supported
1581 * Call ssl_cipher_disabled() to check that it's enabled or not.
1583 int ssl_set_client_disabled(SSL *s)
1585 s->s3.tmp.mask_a = 0;
1586 s->s3.tmp.mask_k = 0;
1587 ssl_set_sig_mask(&s->s3.tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
1588 if (ssl_get_min_max_version(s, &s->s3.tmp.min_ver,
1589 &s->s3.tmp.max_ver, NULL) != 0)
1591 #ifndef OPENSSL_NO_PSK
1592 /* with PSK there must be client callback set */
1593 if (!s->psk_client_callback) {
1594 s->s3.tmp.mask_a |= SSL_aPSK;
1595 s->s3.tmp.mask_k |= SSL_PSK;
1597 #endif /* OPENSSL_NO_PSK */
1598 #ifndef OPENSSL_NO_SRP
1599 if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
1600 s->s3.tmp.mask_a |= SSL_aSRP;
1601 s->s3.tmp.mask_k |= SSL_kSRP;
1608 * ssl_cipher_disabled - check that a cipher is disabled or not
1609 * @s: SSL connection that you want to use the cipher on
1610 * @c: cipher to check
1611 * @op: Security check that you want to do
1612 * @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
1614 * Returns 1 when it's disabled, 0 when enabled.
1616 int ssl_cipher_disabled(const SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
1618 if (c->algorithm_mkey & s->s3.tmp.mask_k
1619 || c->algorithm_auth & s->s3.tmp.mask_a)
1621 if (s->s3.tmp.max_ver == 0)
1623 if (!SSL_IS_DTLS(s)) {
1624 int min_tls = c->min_tls;
1627 * For historical reasons we will allow ECHDE to be selected by a server
1628 * in SSLv3 if we are a client
1630 if (min_tls == TLS1_VERSION && ecdhe
1631 && (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
1632 min_tls = SSL3_VERSION;
1634 if ((min_tls > s->s3.tmp.max_ver) || (c->max_tls < s->s3.tmp.min_ver))
1637 if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3.tmp.max_ver)
1638 || DTLS_VERSION_LT(c->max_dtls, s->s3.tmp.min_ver)))
1641 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1644 int tls_use_ticket(SSL *s)
1646 if ((s->options & SSL_OP_NO_TICKET))
1648 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1651 int tls1_set_server_sigalgs(SSL *s)
1655 /* Clear any shared signature algorithms */
1656 OPENSSL_free(s->shared_sigalgs);
1657 s->shared_sigalgs = NULL;
1658 s->shared_sigalgslen = 0;
1659 /* Clear certificate validity flags */
1660 for (i = 0; i < SSL_PKEY_NUM; i++)
1661 s->s3.tmp.valid_flags[i] = 0;
1663 * If peer sent no signature algorithms check to see if we support
1664 * the default algorithm for each certificate type
1666 if (s->s3.tmp.peer_cert_sigalgs == NULL
1667 && s->s3.tmp.peer_sigalgs == NULL) {
1668 const uint16_t *sent_sigs;
1669 size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1671 for (i = 0; i < SSL_PKEY_NUM; i++) {
1672 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1677 /* Check default matches a type we sent */
1678 for (j = 0; j < sent_sigslen; j++) {
1679 if (lu->sigalg == sent_sigs[j]) {
1680 s->s3.tmp.valid_flags[i] = CERT_PKEY_SIGN;
1688 if (!tls1_process_sigalgs(s)) {
1689 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1692 if (s->shared_sigalgs != NULL)
1695 /* Fatal error if no shared signature algorithms */
1696 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
1697 SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
1702 * Gets the ticket information supplied by the client if any.
1704 * hello: The parsed ClientHello data
1705 * ret: (output) on return, if a ticket was decrypted, then this is set to
1706 * point to the resulting session.
1708 SSL_TICKET_STATUS tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1712 RAW_EXTENSION *ticketext;
1715 s->ext.ticket_expected = 0;
1718 * If tickets disabled or not supported by the protocol version
1719 * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
1722 if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
1723 return SSL_TICKET_NONE;
1725 ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1726 if (!ticketext->present)
1727 return SSL_TICKET_NONE;
1729 size = PACKET_remaining(&ticketext->data);
1731 return tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1732 hello->session_id, hello->session_id_len, ret);
1736 * tls_decrypt_ticket attempts to decrypt a session ticket.
1738 * If s->tls_session_secret_cb is set and we're not doing TLSv1.3 then we are
1739 * expecting a pre-shared key ciphersuite, in which case we have no use for
1740 * session tickets and one will never be decrypted, nor will
1741 * s->ext.ticket_expected be set to 1.
1744 * Sets s->ext.ticket_expected to 1 if the server will have to issue
1745 * a new session ticket to the client because the client indicated support
1746 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
1747 * a session ticket or we couldn't use the one it gave us, or if
1748 * s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1749 * Otherwise, s->ext.ticket_expected is set to 0.
1751 * etick: points to the body of the session ticket extension.
1752 * eticklen: the length of the session tickets extension.
1753 * sess_id: points at the session ID.
1754 * sesslen: the length of the session ID.
1755 * psess: (output) on return, if a ticket was decrypted, then this is set to
1756 * point to the resulting session.
1758 SSL_TICKET_STATUS tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1759 size_t eticklen, const unsigned char *sess_id,
1760 size_t sesslen, SSL_SESSION **psess)
1762 SSL_SESSION *sess = NULL;
1763 unsigned char *sdec;
1764 const unsigned char *p;
1765 int slen, renew_ticket = 0, declen;
1766 SSL_TICKET_STATUS ret = SSL_TICKET_FATAL_ERR_OTHER;
1768 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1769 SSL_HMAC *hctx = NULL;
1770 EVP_CIPHER_CTX *ctx = NULL;
1771 SSL_CTX *tctx = s->session_ctx;
1773 if (eticklen == 0) {
1775 * The client will accept a ticket but doesn't currently have
1776 * one (TLSv1.2 and below), or treated as a fatal error in TLSv1.3
1778 ret = SSL_TICKET_EMPTY;
1781 if (!SSL_IS_TLS13(s) && s->ext.session_secret_cb) {
1783 * Indicate that the ticket couldn't be decrypted rather than
1784 * generating the session from ticket now, trigger
1785 * abbreviated handshake based on external mechanism to
1786 * calculate the master secret later.
1788 ret = SSL_TICKET_NO_DECRYPT;
1792 /* Need at least keyname + iv */
1793 if (eticklen < TLSEXT_KEYNAME_LENGTH + EVP_MAX_IV_LENGTH) {
1794 ret = SSL_TICKET_NO_DECRYPT;
1798 /* Initialize session ticket encryption and HMAC contexts */
1799 hctx = ssl_hmac_new(tctx);
1801 ret = SSL_TICKET_FATAL_ERR_MALLOC;
1804 ctx = EVP_CIPHER_CTX_new();
1806 ret = SSL_TICKET_FATAL_ERR_MALLOC;
1809 #ifndef OPENSSL_NO_DEPRECATED_3_0
1810 if (tctx->ext.ticket_key_evp_cb != NULL || tctx->ext.ticket_key_cb != NULL)
1812 if (tctx->ext.ticket_key_evp_cb != NULL)
1815 unsigned char *nctick = (unsigned char *)etick;
1818 if (tctx->ext.ticket_key_evp_cb != NULL)
1819 rv = tctx->ext.ticket_key_evp_cb(s, nctick,
1820 nctick + TLSEXT_KEYNAME_LENGTH,
1822 ssl_hmac_get0_EVP_MAC_CTX(hctx),
1824 #ifndef OPENSSL_NO_DEPRECATED_3_0
1825 else if (tctx->ext.ticket_key_cb != NULL)
1826 /* if 0 is returned, write an empty ticket */
1827 rv = tctx->ext.ticket_key_cb(s, nctick,
1828 nctick + TLSEXT_KEYNAME_LENGTH,
1829 ctx, ssl_hmac_get0_HMAC_CTX(hctx), 0);
1832 ret = SSL_TICKET_FATAL_ERR_OTHER;
1836 ret = SSL_TICKET_NO_DECRYPT;
1842 EVP_CIPHER *aes256cbc = NULL;
1844 /* Check key name matches */
1845 if (memcmp(etick, tctx->ext.tick_key_name,
1846 TLSEXT_KEYNAME_LENGTH) != 0) {
1847 ret = SSL_TICKET_NO_DECRYPT;
1851 aes256cbc = EVP_CIPHER_fetch(s->ctx->libctx, "AES-256-CBC",
1853 if (aes256cbc == NULL
1854 || ssl_hmac_init(hctx, tctx->ext.secure->tick_hmac_key,
1855 sizeof(tctx->ext.secure->tick_hmac_key),
1857 || EVP_DecryptInit_ex(ctx, aes256cbc, NULL,
1858 tctx->ext.secure->tick_aes_key,
1859 etick + TLSEXT_KEYNAME_LENGTH) <= 0) {
1860 EVP_CIPHER_free(aes256cbc);
1861 ret = SSL_TICKET_FATAL_ERR_OTHER;
1864 EVP_CIPHER_free(aes256cbc);
1865 if (SSL_IS_TLS13(s))
1869 * Attempt to process session ticket, first conduct sanity and integrity
1872 mlen = ssl_hmac_size(hctx);
1874 ret = SSL_TICKET_FATAL_ERR_OTHER;
1878 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1880 TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1881 ret = SSL_TICKET_NO_DECRYPT;
1885 /* Check HMAC of encrypted ticket */
1886 if (ssl_hmac_update(hctx, etick, eticklen) <= 0
1887 || ssl_hmac_final(hctx, tick_hmac, NULL, sizeof(tick_hmac)) <= 0) {
1888 ret = SSL_TICKET_FATAL_ERR_OTHER;
1892 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
1893 ret = SSL_TICKET_NO_DECRYPT;
1896 /* Attempt to decrypt session data */
1897 /* Move p after IV to start of encrypted ticket, update length */
1898 p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1899 eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1900 sdec = OPENSSL_malloc(eticklen);
1901 if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1902 (int)eticklen) <= 0) {
1904 ret = SSL_TICKET_FATAL_ERR_OTHER;
1907 if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
1909 ret = SSL_TICKET_NO_DECRYPT;
1915 sess = d2i_SSL_SESSION(NULL, &p, slen);
1919 /* Some additional consistency checks */
1921 SSL_SESSION_free(sess);
1923 ret = SSL_TICKET_NO_DECRYPT;
1927 * The session ID, if non-empty, is used by some clients to detect
1928 * that the ticket has been accepted. So we copy it to the session
1929 * structure. If it is empty set length to zero as required by
1933 memcpy(sess->session_id, sess_id, sesslen);
1934 sess->session_id_length = sesslen;
1937 ret = SSL_TICKET_SUCCESS_RENEW;
1939 ret = SSL_TICKET_SUCCESS;
1944 * For session parse failure, indicate that we need to send a new ticket.
1946 ret = SSL_TICKET_NO_DECRYPT;
1949 EVP_CIPHER_CTX_free(ctx);
1950 ssl_hmac_free(hctx);
1953 * If set, the decrypt_ticket_cb() is called unless a fatal error was
1954 * detected above. The callback is responsible for checking |ret| before it
1955 * performs any action
1957 if (s->session_ctx->decrypt_ticket_cb != NULL
1958 && (ret == SSL_TICKET_EMPTY
1959 || ret == SSL_TICKET_NO_DECRYPT
1960 || ret == SSL_TICKET_SUCCESS
1961 || ret == SSL_TICKET_SUCCESS_RENEW)) {
1962 size_t keyname_len = eticklen;
1965 if (keyname_len > TLSEXT_KEYNAME_LENGTH)
1966 keyname_len = TLSEXT_KEYNAME_LENGTH;
1967 retcb = s->session_ctx->decrypt_ticket_cb(s, sess, etick, keyname_len,
1969 s->session_ctx->ticket_cb_data);
1971 case SSL_TICKET_RETURN_ABORT:
1972 ret = SSL_TICKET_FATAL_ERR_OTHER;
1975 case SSL_TICKET_RETURN_IGNORE:
1976 ret = SSL_TICKET_NONE;
1977 SSL_SESSION_free(sess);
1981 case SSL_TICKET_RETURN_IGNORE_RENEW:
1982 if (ret != SSL_TICKET_EMPTY && ret != SSL_TICKET_NO_DECRYPT)
1983 ret = SSL_TICKET_NO_DECRYPT;
1984 /* else the value of |ret| will already do the right thing */
1985 SSL_SESSION_free(sess);
1989 case SSL_TICKET_RETURN_USE:
1990 case SSL_TICKET_RETURN_USE_RENEW:
1991 if (ret != SSL_TICKET_SUCCESS
1992 && ret != SSL_TICKET_SUCCESS_RENEW)
1993 ret = SSL_TICKET_FATAL_ERR_OTHER;
1994 else if (retcb == SSL_TICKET_RETURN_USE)
1995 ret = SSL_TICKET_SUCCESS;
1997 ret = SSL_TICKET_SUCCESS_RENEW;
2001 ret = SSL_TICKET_FATAL_ERR_OTHER;
2005 if (s->ext.session_secret_cb == NULL || SSL_IS_TLS13(s)) {
2007 case SSL_TICKET_NO_DECRYPT:
2008 case SSL_TICKET_SUCCESS_RENEW:
2009 case SSL_TICKET_EMPTY:
2010 s->ext.ticket_expected = 1;
2019 /* Check to see if a signature algorithm is allowed */
2020 static int tls12_sigalg_allowed(const SSL *s, int op, const SIGALG_LOOKUP *lu)
2022 unsigned char sigalgstr[2];
2025 if (lu == NULL || !lu->enabled)
2027 /* DSA is not allowed in TLS 1.3 */
2028 if (SSL_IS_TLS13(s) && lu->sig == EVP_PKEY_DSA)
2031 * At some point we should fully axe DSA/etc. in ClientHello as per TLS 1.3
2034 if (!s->server && !SSL_IS_DTLS(s) && s->s3.tmp.min_ver >= TLS1_3_VERSION
2035 && (lu->sig == EVP_PKEY_DSA || lu->hash_idx == SSL_MD_SHA1_IDX
2036 || lu->hash_idx == SSL_MD_MD5_IDX
2037 || lu->hash_idx == SSL_MD_SHA224_IDX))
2040 /* See if public key algorithm allowed */
2041 if (ssl_cert_is_disabled(s->ctx, lu->sig_idx))
2044 if (lu->sig == NID_id_GostR3410_2012_256
2045 || lu->sig == NID_id_GostR3410_2012_512
2046 || lu->sig == NID_id_GostR3410_2001) {
2047 /* We never allow GOST sig algs on the server with TLSv1.3 */
2048 if (s->server && SSL_IS_TLS13(s))
2051 && s->method->version == TLS_ANY_VERSION
2052 && s->s3.tmp.max_ver >= TLS1_3_VERSION) {
2054 STACK_OF(SSL_CIPHER) *sk;
2057 * We're a client that could negotiate TLSv1.3. We only allow GOST
2058 * sig algs if we could negotiate TLSv1.2 or below and we have GOST
2059 * ciphersuites enabled.
2062 if (s->s3.tmp.min_ver >= TLS1_3_VERSION)
2065 sk = SSL_get_ciphers(s);
2066 num = sk != NULL ? sk_SSL_CIPHER_num(sk) : 0;
2067 for (i = 0; i < num; i++) {
2068 const SSL_CIPHER *c;
2070 c = sk_SSL_CIPHER_value(sk, i);
2071 /* Skip disabled ciphers */
2072 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0))
2075 if ((c->algorithm_mkey & (SSL_kGOST | SSL_kGOST18)) != 0)
2083 /* Finally see if security callback allows it */
2084 secbits = sigalg_security_bits(s->ctx, lu);
2085 sigalgstr[0] = (lu->sigalg >> 8) & 0xff;
2086 sigalgstr[1] = lu->sigalg & 0xff;
2087 return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
2091 * Get a mask of disabled public key algorithms based on supported signature
2092 * algorithms. For example if no signature algorithm supports RSA then RSA is
2096 void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
2098 const uint16_t *sigalgs;
2099 size_t i, sigalgslen;
2100 uint32_t disabled_mask = SSL_aRSA | SSL_aDSS | SSL_aECDSA;
2102 * Go through all signature algorithms seeing if we support any
2105 sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
2106 for (i = 0; i < sigalgslen; i++, sigalgs++) {
2107 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, *sigalgs);
2108 const SSL_CERT_LOOKUP *clu;
2113 clu = ssl_cert_lookup_by_idx(lu->sig_idx);
2117 /* If algorithm is disabled see if we can enable it */
2118 if ((clu->amask & disabled_mask) != 0
2119 && tls12_sigalg_allowed(s, op, lu))
2120 disabled_mask &= ~clu->amask;
2122 *pmask_a |= disabled_mask;
2125 int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
2126 const uint16_t *psig, size_t psiglen)
2131 for (i = 0; i < psiglen; i++, psig++) {
2132 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, *psig);
2135 || !tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
2137 if (!WPACKET_put_bytes_u16(pkt, *psig))
2140 * If TLS 1.3 must have at least one valid TLS 1.3 message
2141 * signing algorithm: i.e. neither RSA nor SHA1/SHA224
2143 if (rv == 0 && (!SSL_IS_TLS13(s)
2144 || (lu->sig != EVP_PKEY_RSA
2145 && lu->hash != NID_sha1
2146 && lu->hash != NID_sha224)))
2150 ERR_raise(ERR_LIB_SSL, SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2154 /* Given preference and allowed sigalgs set shared sigalgs */
2155 static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
2156 const uint16_t *pref, size_t preflen,
2157 const uint16_t *allow, size_t allowlen)
2159 const uint16_t *ptmp, *atmp;
2160 size_t i, j, nmatch = 0;
2161 for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
2162 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, *ptmp);
2164 /* Skip disabled hashes or signature algorithms */
2166 || !tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, lu))
2168 for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
2169 if (*ptmp == *atmp) {
2180 /* Set shared signature algorithms for SSL structures */
2181 static int tls1_set_shared_sigalgs(SSL *s)
2183 const uint16_t *pref, *allow, *conf;
2184 size_t preflen, allowlen, conflen;
2186 const SIGALG_LOOKUP **salgs = NULL;
2188 unsigned int is_suiteb = tls1_suiteb(s);
2190 OPENSSL_free(s->shared_sigalgs);
2191 s->shared_sigalgs = NULL;
2192 s->shared_sigalgslen = 0;
2193 /* If client use client signature algorithms if not NULL */
2194 if (!s->server && c->client_sigalgs && !is_suiteb) {
2195 conf = c->client_sigalgs;
2196 conflen = c->client_sigalgslen;
2197 } else if (c->conf_sigalgs && !is_suiteb) {
2198 conf = c->conf_sigalgs;
2199 conflen = c->conf_sigalgslen;
2201 conflen = tls12_get_psigalgs(s, 0, &conf);
2202 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
2205 allow = s->s3.tmp.peer_sigalgs;
2206 allowlen = s->s3.tmp.peer_sigalgslen;
2210 pref = s->s3.tmp.peer_sigalgs;
2211 preflen = s->s3.tmp.peer_sigalgslen;
2213 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
2215 if ((salgs = OPENSSL_malloc(nmatch * sizeof(*salgs))) == NULL) {
2216 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
2219 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
2223 s->shared_sigalgs = salgs;
2224 s->shared_sigalgslen = nmatch;
2228 int tls1_save_u16(PACKET *pkt, uint16_t **pdest, size_t *pdestlen)
2234 size = PACKET_remaining(pkt);
2236 /* Invalid data length */
2237 if (size == 0 || (size & 1) != 0)
2242 if ((buf = OPENSSL_malloc(size * sizeof(*buf))) == NULL) {
2243 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
2246 for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
2254 OPENSSL_free(*pdest);
2261 int tls1_save_sigalgs(SSL *s, PACKET *pkt, int cert)
2263 /* Extension ignored for inappropriate versions */
2264 if (!SSL_USE_SIGALGS(s))
2266 /* Should never happen */
2267 if (s->cert == NULL)
2271 return tls1_save_u16(pkt, &s->s3.tmp.peer_cert_sigalgs,
2272 &s->s3.tmp.peer_cert_sigalgslen);
2274 return tls1_save_u16(pkt, &s->s3.tmp.peer_sigalgs,
2275 &s->s3.tmp.peer_sigalgslen);
2279 /* Set preferred digest for each key type */
2281 int tls1_process_sigalgs(SSL *s)
2284 uint32_t *pvalid = s->s3.tmp.valid_flags;
2286 if (!tls1_set_shared_sigalgs(s))
2289 for (i = 0; i < SSL_PKEY_NUM; i++)
2292 for (i = 0; i < s->shared_sigalgslen; i++) {
2293 const SIGALG_LOOKUP *sigptr = s->shared_sigalgs[i];
2294 int idx = sigptr->sig_idx;
2296 /* Ignore PKCS1 based sig algs in TLSv1.3 */
2297 if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
2299 /* If not disabled indicate we can explicitly sign */
2300 if (pvalid[idx] == 0 && !ssl_cert_is_disabled(s->ctx, idx))
2301 pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
2306 int SSL_get_sigalgs(SSL *s, int idx,
2307 int *psign, int *phash, int *psignhash,
2308 unsigned char *rsig, unsigned char *rhash)
2310 uint16_t *psig = s->s3.tmp.peer_sigalgs;
2311 size_t numsigalgs = s->s3.tmp.peer_sigalgslen;
2312 if (psig == NULL || numsigalgs > INT_MAX)
2315 const SIGALG_LOOKUP *lu;
2317 if (idx >= (int)numsigalgs)
2321 *rhash = (unsigned char)((*psig >> 8) & 0xff);
2323 *rsig = (unsigned char)(*psig & 0xff);
2324 lu = tls1_lookup_sigalg(s, *psig);
2326 *psign = lu != NULL ? lu->sig : NID_undef;
2328 *phash = lu != NULL ? lu->hash : NID_undef;
2329 if (psignhash != NULL)
2330 *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
2332 return (int)numsigalgs;
2335 int SSL_get_shared_sigalgs(SSL *s, int idx,
2336 int *psign, int *phash, int *psignhash,
2337 unsigned char *rsig, unsigned char *rhash)
2339 const SIGALG_LOOKUP *shsigalgs;
2340 if (s->shared_sigalgs == NULL
2342 || idx >= (int)s->shared_sigalgslen
2343 || s->shared_sigalgslen > INT_MAX)
2345 shsigalgs = s->shared_sigalgs[idx];
2347 *phash = shsigalgs->hash;
2349 *psign = shsigalgs->sig;
2350 if (psignhash != NULL)
2351 *psignhash = shsigalgs->sigandhash;
2353 *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
2355 *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
2356 return (int)s->shared_sigalgslen;
2359 /* Maximum possible number of unique entries in sigalgs array */
2360 #define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
2364 /* TLSEXT_SIGALG_XXX values */
2365 uint16_t sigalgs[TLS_MAX_SIGALGCNT];
2368 static void get_sigorhash(int *psig, int *phash, const char *str)
2370 if (strcmp(str, "RSA") == 0) {
2371 *psig = EVP_PKEY_RSA;
2372 } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
2373 *psig = EVP_PKEY_RSA_PSS;
2374 } else if (strcmp(str, "DSA") == 0) {
2375 *psig = EVP_PKEY_DSA;
2376 } else if (strcmp(str, "ECDSA") == 0) {
2377 *psig = EVP_PKEY_EC;
2379 *phash = OBJ_sn2nid(str);
2380 if (*phash == NID_undef)
2381 *phash = OBJ_ln2nid(str);
2384 /* Maximum length of a signature algorithm string component */
2385 #define TLS_MAX_SIGSTRING_LEN 40
2387 static int sig_cb(const char *elem, int len, void *arg)
2389 sig_cb_st *sarg = arg;
2391 const SIGALG_LOOKUP *s;
2392 char etmp[TLS_MAX_SIGSTRING_LEN], *p;
2393 int sig_alg = NID_undef, hash_alg = NID_undef;
2396 if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
2398 if (len > (int)(sizeof(etmp) - 1))
2400 memcpy(etmp, elem, len);
2402 p = strchr(etmp, '+');
2404 * We only allow SignatureSchemes listed in the sigalg_lookup_tbl;
2405 * if there's no '+' in the provided name, look for the new-style combined
2406 * name. If not, match both sig+hash to find the needed SIGALG_LOOKUP.
2407 * Just sig+hash is not unique since TLS 1.3 adds rsa_pss_pss_* and
2408 * rsa_pss_rsae_* that differ only by public key OID; in such cases
2409 * we will pick the _rsae_ variant, by virtue of them appearing earlier
2413 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
2415 if (s->name != NULL && strcmp(etmp, s->name) == 0) {
2416 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
2420 if (i == OSSL_NELEM(sigalg_lookup_tbl))
2427 get_sigorhash(&sig_alg, &hash_alg, etmp);
2428 get_sigorhash(&sig_alg, &hash_alg, p);
2429 if (sig_alg == NID_undef || hash_alg == NID_undef)
2431 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
2433 if (s->hash == hash_alg && s->sig == sig_alg) {
2434 sarg->sigalgs[sarg->sigalgcnt++] = s->sigalg;
2438 if (i == OSSL_NELEM(sigalg_lookup_tbl))
2442 /* Reject duplicates */
2443 for (i = 0; i < sarg->sigalgcnt - 1; i++) {
2444 if (sarg->sigalgs[i] == sarg->sigalgs[sarg->sigalgcnt - 1]) {
2453 * Set supported signature algorithms based on a colon separated list of the
2454 * form sig+hash e.g. RSA+SHA512:DSA+SHA512
2456 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
2460 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
2464 return tls1_set_raw_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
2467 int tls1_set_raw_sigalgs(CERT *c, const uint16_t *psigs, size_t salglen,
2472 if ((sigalgs = OPENSSL_malloc(salglen * sizeof(*sigalgs))) == NULL) {
2473 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
2476 memcpy(sigalgs, psigs, salglen * sizeof(*sigalgs));
2479 OPENSSL_free(c->client_sigalgs);
2480 c->client_sigalgs = sigalgs;
2481 c->client_sigalgslen = salglen;
2483 OPENSSL_free(c->conf_sigalgs);
2484 c->conf_sigalgs = sigalgs;
2485 c->conf_sigalgslen = salglen;
2491 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
2493 uint16_t *sigalgs, *sptr;
2498 if ((sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs))) == NULL) {
2499 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
2502 for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
2504 const SIGALG_LOOKUP *curr;
2505 int md_id = *psig_nids++;
2506 int sig_id = *psig_nids++;
2508 for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
2510 if (curr->hash == md_id && curr->sig == sig_id) {
2511 *sptr++ = curr->sigalg;
2516 if (j == OSSL_NELEM(sigalg_lookup_tbl))
2521 OPENSSL_free(c->client_sigalgs);
2522 c->client_sigalgs = sigalgs;
2523 c->client_sigalgslen = salglen / 2;
2525 OPENSSL_free(c->conf_sigalgs);
2526 c->conf_sigalgs = sigalgs;
2527 c->conf_sigalgslen = salglen / 2;
2533 OPENSSL_free(sigalgs);
2537 static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
2539 int sig_nid, use_pc_sigalgs = 0;
2541 const SIGALG_LOOKUP *sigalg;
2543 if (default_nid == -1)
2545 sig_nid = X509_get_signature_nid(x);
2547 return sig_nid == default_nid ? 1 : 0;
2549 if (SSL_IS_TLS13(s) && s->s3.tmp.peer_cert_sigalgs != NULL) {
2551 * If we're in TLSv1.3 then we only get here if we're checking the
2552 * chain. If the peer has specified peer_cert_sigalgs then we use them
2553 * otherwise we default to normal sigalgs.
2555 sigalgslen = s->s3.tmp.peer_cert_sigalgslen;
2558 sigalgslen = s->shared_sigalgslen;
2560 for (i = 0; i < sigalgslen; i++) {
2561 sigalg = use_pc_sigalgs
2562 ? tls1_lookup_sigalg(s, s->s3.tmp.peer_cert_sigalgs[i])
2563 : s->shared_sigalgs[i];
2564 if (sigalg != NULL && sig_nid == sigalg->sigandhash)
2570 /* Check to see if a certificate issuer name matches list of CA names */
2571 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
2573 const X509_NAME *nm;
2575 nm = X509_get_issuer_name(x);
2576 for (i = 0; i < sk_X509_NAME_num(names); i++) {
2577 if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
2584 * Check certificate chain is consistent with TLS extensions and is usable by
2585 * server. This servers two purposes: it allows users to check chains before
2586 * passing them to the server and it allows the server to check chains before
2587 * attempting to use them.
2590 /* Flags which need to be set for a certificate when strict mode not set */
2592 #define CERT_PKEY_VALID_FLAGS \
2593 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
2594 /* Strict mode flags */
2595 #define CERT_PKEY_STRICT_FLAGS \
2596 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
2597 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
2599 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
2604 int check_flags = 0, strict_mode;
2605 CERT_PKEY *cpk = NULL;
2608 unsigned int suiteb_flags = tls1_suiteb(s);
2609 /* idx == -1 means checking server chains */
2611 /* idx == -2 means checking client certificate chains */
2614 idx = (int)(cpk - c->pkeys);
2616 cpk = c->pkeys + idx;
2617 pvalid = s->s3.tmp.valid_flags + idx;
2619 pk = cpk->privatekey;
2621 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
2622 /* If no cert or key, forget it */
2631 if (ssl_cert_lookup_by_pkey(pk, &certidx) == NULL)
2634 pvalid = s->s3.tmp.valid_flags + idx;
2636 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
2637 check_flags = CERT_PKEY_STRICT_FLAGS;
2639 check_flags = CERT_PKEY_VALID_FLAGS;
2646 check_flags |= CERT_PKEY_SUITEB;
2647 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
2648 if (ok == X509_V_OK)
2649 rv |= CERT_PKEY_SUITEB;
2650 else if (!check_flags)
2655 * Check all signature algorithms are consistent with signature
2656 * algorithms extension if TLS 1.2 or later and strict mode.
2658 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
2661 if (s->s3.tmp.peer_cert_sigalgs != NULL
2662 || s->s3.tmp.peer_sigalgs != NULL) {
2664 /* If no sigalgs extension use defaults from RFC5246 */
2668 rsign = EVP_PKEY_RSA;
2669 default_nid = NID_sha1WithRSAEncryption;
2672 case SSL_PKEY_DSA_SIGN:
2673 rsign = EVP_PKEY_DSA;
2674 default_nid = NID_dsaWithSHA1;
2678 rsign = EVP_PKEY_EC;
2679 default_nid = NID_ecdsa_with_SHA1;
2682 case SSL_PKEY_GOST01:
2683 rsign = NID_id_GostR3410_2001;
2684 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
2687 case SSL_PKEY_GOST12_256:
2688 rsign = NID_id_GostR3410_2012_256;
2689 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
2692 case SSL_PKEY_GOST12_512:
2693 rsign = NID_id_GostR3410_2012_512;
2694 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
2703 * If peer sent no signature algorithms extension and we have set
2704 * preferred signature algorithms check we support sha1.
2706 if (default_nid > 0 && c->conf_sigalgs) {
2708 const uint16_t *p = c->conf_sigalgs;
2709 for (j = 0; j < c->conf_sigalgslen; j++, p++) {
2710 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(s, *p);
2712 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
2715 if (j == c->conf_sigalgslen) {
2722 /* Check signature algorithm of each cert in chain */
2723 if (SSL_IS_TLS13(s)) {
2725 * We only get here if the application has called SSL_check_chain(),
2726 * so check_flags is always set.
2728 if (find_sig_alg(s, x, pk) != NULL)
2729 rv |= CERT_PKEY_EE_SIGNATURE;
2730 } else if (!tls1_check_sig_alg(s, x, default_nid)) {
2734 rv |= CERT_PKEY_EE_SIGNATURE;
2735 rv |= CERT_PKEY_CA_SIGNATURE;
2736 for (i = 0; i < sk_X509_num(chain); i++) {
2737 if (!tls1_check_sig_alg(s, sk_X509_value(chain, i), default_nid)) {
2739 rv &= ~CERT_PKEY_CA_SIGNATURE;
2746 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
2747 else if (check_flags)
2748 rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
2750 /* Check cert parameters are consistent */
2751 if (tls1_check_cert_param(s, x, 1))
2752 rv |= CERT_PKEY_EE_PARAM;
2753 else if (!check_flags)
2756 rv |= CERT_PKEY_CA_PARAM;
2757 /* In strict mode check rest of chain too */
2758 else if (strict_mode) {
2759 rv |= CERT_PKEY_CA_PARAM;
2760 for (i = 0; i < sk_X509_num(chain); i++) {
2761 X509 *ca = sk_X509_value(chain, i);
2762 if (!tls1_check_cert_param(s, ca, 0)) {
2764 rv &= ~CERT_PKEY_CA_PARAM;
2771 if (!s->server && strict_mode) {
2772 STACK_OF(X509_NAME) *ca_dn;
2775 if (EVP_PKEY_is_a(pk, "RSA"))
2776 check_type = TLS_CT_RSA_SIGN;
2777 else if (EVP_PKEY_is_a(pk, "DSA"))
2778 check_type = TLS_CT_DSS_SIGN;
2779 else if (EVP_PKEY_is_a(pk, "EC"))
2780 check_type = TLS_CT_ECDSA_SIGN;
2783 const uint8_t *ctypes = s->s3.tmp.ctype;
2786 for (j = 0; j < s->s3.tmp.ctype_len; j++, ctypes++) {
2787 if (*ctypes == check_type) {
2788 rv |= CERT_PKEY_CERT_TYPE;
2792 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
2795 rv |= CERT_PKEY_CERT_TYPE;
2798 ca_dn = s->s3.tmp.peer_ca_names;
2800 if (!sk_X509_NAME_num(ca_dn))
2801 rv |= CERT_PKEY_ISSUER_NAME;
2803 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2804 if (ssl_check_ca_name(ca_dn, x))
2805 rv |= CERT_PKEY_ISSUER_NAME;
2807 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2808 for (i = 0; i < sk_X509_num(chain); i++) {
2809 X509 *xtmp = sk_X509_value(chain, i);
2810 if (ssl_check_ca_name(ca_dn, xtmp)) {
2811 rv |= CERT_PKEY_ISSUER_NAME;
2816 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
2819 rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
2821 if (!check_flags || (rv & check_flags) == check_flags)
2822 rv |= CERT_PKEY_VALID;
2826 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2827 rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2829 rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
2832 * When checking a CERT_PKEY structure all flags are irrelevant if the
2836 if (rv & CERT_PKEY_VALID) {
2839 /* Preserve sign and explicit sign flag, clear rest */
2840 *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
2847 /* Set validity of certificates in an SSL structure */
2848 void tls1_set_cert_validity(SSL *s)
2850 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
2851 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_PSS_SIGN);
2852 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
2853 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
2854 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2855 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2856 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
2857 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED25519);
2858 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED448);
2861 /* User level utility function to check a chain is suitable */
2862 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
2864 return tls1_check_chain(s, x, pk, chain, -1);
2867 EVP_PKEY *ssl_get_auto_dh(SSL *s)
2869 EVP_PKEY *dhp = NULL;
2871 int dh_secbits = 80;
2872 EVP_PKEY_CTX *pctx = NULL;
2873 OSSL_PARAM_BLD *tmpl = NULL;
2874 OSSL_PARAM *params = NULL;
2876 if (s->cert->dh_tmp_auto != 2) {
2877 if (s->s3.tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
2878 if (s->s3.tmp.new_cipher->strength_bits == 256)
2883 if (s->s3.tmp.cert == NULL)
2885 dh_secbits = EVP_PKEY_security_bits(s->s3.tmp.cert->privatekey);
2889 if (dh_secbits >= 192)
2890 p = BN_get_rfc3526_prime_8192(NULL);
2891 else if (dh_secbits >= 152)
2892 p = BN_get_rfc3526_prime_4096(NULL);
2893 else if (dh_secbits >= 128)
2894 p = BN_get_rfc3526_prime_3072(NULL);
2895 else if (dh_secbits >= 112)
2896 p = BN_get_rfc3526_prime_2048(NULL);
2898 p = BN_get_rfc2409_prime_1024(NULL);
2902 pctx = EVP_PKEY_CTX_new_from_name(s->ctx->libctx, "DH", s->ctx->propq);
2904 || EVP_PKEY_fromdata_init(pctx) != 1)
2907 tmpl = OSSL_PARAM_BLD_new();
2909 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
2910 || !OSSL_PARAM_BLD_push_uint(tmpl, OSSL_PKEY_PARAM_FFC_G, 2))
2913 params = OSSL_PARAM_BLD_to_param(tmpl);
2915 || EVP_PKEY_fromdata(pctx, &dhp, EVP_PKEY_KEY_PARAMETERS, params) != 1)
2919 OSSL_PARAM_BLD_free_params(params);
2920 OSSL_PARAM_BLD_free(tmpl);
2921 EVP_PKEY_CTX_free(pctx);
2926 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2929 EVP_PKEY *pkey = X509_get0_pubkey(x);
2932 * If no parameters this will return -1 and fail using the default
2933 * security callback for any non-zero security level. This will
2934 * reject keys which omit parameters but this only affects DSA and
2935 * omission of parameters is never (?) done in practice.
2937 secbits = EVP_PKEY_security_bits(pkey);
2940 return ssl_security(s, op, secbits, 0, x);
2942 return ssl_ctx_security(ctx, op, secbits, 0, x);
2945 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2947 /* Lookup signature algorithm digest */
2948 int secbits, nid, pknid;
2949 /* Don't check signature if self signed */
2950 if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2952 if (!X509_get_signature_info(x, &nid, &pknid, &secbits, NULL))
2954 /* If digest NID not defined use signature NID */
2955 if (nid == NID_undef)
2958 return ssl_security(s, op, secbits, nid, x);
2960 return ssl_ctx_security(ctx, op, secbits, nid, x);
2963 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
2966 vfy = SSL_SECOP_PEER;
2968 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2969 return SSL_R_EE_KEY_TOO_SMALL;
2971 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2972 return SSL_R_CA_KEY_TOO_SMALL;
2974 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2975 return SSL_R_CA_MD_TOO_WEAK;
2980 * Check security of a chain, if |sk| includes the end entity certificate then
2981 * |x| is NULL. If |vfy| is 1 then we are verifying a peer chain and not sending
2982 * one to the peer. Return values: 1 if ok otherwise error code to use
2985 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
2987 int rv, start_idx, i;
2989 x = sk_X509_value(sk, 0);
2994 rv = ssl_security_cert(s, NULL, x, vfy, 1);
2998 for (i = start_idx; i < sk_X509_num(sk); i++) {
2999 x = sk_X509_value(sk, i);
3000 rv = ssl_security_cert(s, NULL, x, vfy, 0);
3008 * For TLS 1.2 servers check if we have a certificate which can be used
3009 * with the signature algorithm "lu" and return index of certificate.
3012 static int tls12_get_cert_sigalg_idx(const SSL *s, const SIGALG_LOOKUP *lu)
3014 int sig_idx = lu->sig_idx;
3015 const SSL_CERT_LOOKUP *clu = ssl_cert_lookup_by_idx(sig_idx);
3017 /* If not recognised or not supported by cipher mask it is not suitable */
3019 || (clu->amask & s->s3.tmp.new_cipher->algorithm_auth) == 0
3020 || (clu->nid == EVP_PKEY_RSA_PSS
3021 && (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kRSA) != 0))
3024 return s->s3.tmp.valid_flags[sig_idx] & CERT_PKEY_VALID ? sig_idx : -1;
3028 * Checks the given cert against signature_algorithm_cert restrictions sent by
3029 * the peer (if any) as well as whether the hash from the sigalg is usable with
3031 * Returns true if the cert is usable and false otherwise.
3033 static int check_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
3036 const SIGALG_LOOKUP *lu;
3037 int mdnid, pknid, supported;
3041 * If the given EVP_PKEY cannot supporting signing with this sigalg,
3042 * the answer is simply 'no'.
3045 supported = EVP_PKEY_supports_digest_nid(pkey, sig->hash);
3051 * The TLS 1.3 signature_algorithms_cert extension places restrictions
3052 * on the sigalg with which the certificate was signed (by its issuer).
3054 if (s->s3.tmp.peer_cert_sigalgs != NULL) {
3055 if (!X509_get_signature_info(x, &mdnid, &pknid, NULL, NULL))
3057 for (i = 0; i < s->s3.tmp.peer_cert_sigalgslen; i++) {
3058 lu = tls1_lookup_sigalg(s, s->s3.tmp.peer_cert_sigalgs[i]);
3063 * TODO this does not differentiate between the
3064 * rsa_pss_pss_* and rsa_pss_rsae_* schemes since we do not
3065 * have a chain here that lets us look at the key OID in the
3066 * signing certificate.
3068 if (mdnid == lu->hash && pknid == lu->sig)
3075 * Without signat_algorithms_cert, any certificate for which we have
3076 * a viable public key is permitted.
3082 * Returns true if |s| has a usable certificate configured for use
3083 * with signature scheme |sig|.
3084 * "Usable" includes a check for presence as well as applying
3085 * the signature_algorithm_cert restrictions sent by the peer (if any).
3086 * Returns false if no usable certificate is found.
3088 static int has_usable_cert(SSL *s, const SIGALG_LOOKUP *sig, int idx)
3090 /* TLS 1.2 callers can override sig->sig_idx, but not TLS 1.3 callers. */
3093 if (!ssl_has_cert(s, idx))
3096 return check_cert_usable(s, sig, s->cert->pkeys[idx].x509,
3097 s->cert->pkeys[idx].privatekey);
3101 * Returns true if the supplied cert |x| and key |pkey| is usable with the
3102 * specified signature scheme |sig|, or false otherwise.
3104 static int is_cert_usable(SSL *s, const SIGALG_LOOKUP *sig, X509 *x,
3109 if (ssl_cert_lookup_by_pkey(pkey, &idx) == NULL)
3112 /* Check the key is consistent with the sig alg */
3113 if ((int)idx != sig->sig_idx)
3116 return check_cert_usable(s, sig, x, pkey);
3120 * Find a signature scheme that works with the supplied certificate |x| and key
3121 * |pkey|. |x| and |pkey| may be NULL in which case we additionally look at our
3122 * available certs/keys to find one that works.
3124 static const SIGALG_LOOKUP *find_sig_alg(SSL *s, X509 *x, EVP_PKEY *pkey)
3126 const SIGALG_LOOKUP *lu = NULL;
3131 /* Look for a shared sigalgs matching possible certificates */
3132 for (i = 0; i < s->shared_sigalgslen; i++) {
3133 lu = s->shared_sigalgs[i];
3135 /* Skip SHA1, SHA224, DSA and RSA if not PSS */
3136 if (lu->hash == NID_sha1
3137 || lu->hash == NID_sha224
3138 || lu->sig == EVP_PKEY_DSA
3139 || lu->sig == EVP_PKEY_RSA)
3141 /* Check that we have a cert, and signature_algorithms_cert */
3142 if (!tls1_lookup_md(s->ctx, lu, NULL))
3144 if ((pkey == NULL && !has_usable_cert(s, lu, -1))
3145 || (pkey != NULL && !is_cert_usable(s, lu, x, pkey)))
3148 tmppkey = (pkey != NULL) ? pkey
3149 : s->cert->pkeys[lu->sig_idx].privatekey;
3151 if (lu->sig == EVP_PKEY_EC) {
3153 curve = ssl_get_EC_curve_nid(tmppkey);
3154 if (lu->curve != NID_undef && curve != lu->curve)
3156 } else if (lu->sig == EVP_PKEY_RSA_PSS) {
3157 /* validate that key is large enough for the signature algorithm */
3158 if (!rsa_pss_check_min_key_size(s->ctx, tmppkey, lu))
3164 if (i == s->shared_sigalgslen)
3171 * Choose an appropriate signature algorithm based on available certificates
3172 * Sets chosen certificate and signature algorithm.
3174 * For servers if we fail to find a required certificate it is a fatal error,
3175 * an appropriate error code is set and a TLS alert is sent.
3177 * For clients fatalerrs is set to 0. If a certificate is not suitable it is not
3178 * a fatal error: we will either try another certificate or not present one
3179 * to the server. In this case no error is set.
3181 int tls_choose_sigalg(SSL *s, int fatalerrs)
3183 const SIGALG_LOOKUP *lu = NULL;
3186 s->s3.tmp.cert = NULL;
3187 s->s3.tmp.sigalg = NULL;
3189 if (SSL_IS_TLS13(s)) {
3190 lu = find_sig_alg(s, NULL, NULL);
3194 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3195 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
3199 /* If ciphersuite doesn't require a cert nothing to do */
3200 if (!(s->s3.tmp.new_cipher->algorithm_auth & SSL_aCERT))
3202 if (!s->server && !ssl_has_cert(s, s->cert->key - s->cert->pkeys))
3205 if (SSL_USE_SIGALGS(s)) {
3207 if (s->s3.tmp.peer_sigalgs != NULL) {
3210 /* For Suite B need to match signature algorithm to curve */
3212 curve = ssl_get_EC_curve_nid(s->cert->pkeys[SSL_PKEY_ECC]
3216 * Find highest preference signature algorithm matching
3219 for (i = 0; i < s->shared_sigalgslen; i++) {
3220 lu = s->shared_sigalgs[i];
3223 if ((sig_idx = tls12_get_cert_sigalg_idx(s, lu)) == -1)
3226 int cc_idx = s->cert->key - s->cert->pkeys;
3228 sig_idx = lu->sig_idx;
3229 if (cc_idx != sig_idx)
3232 /* Check that we have a cert, and sig_algs_cert */
3233 if (!has_usable_cert(s, lu, sig_idx))
3235 if (lu->sig == EVP_PKEY_RSA_PSS) {
3236 /* validate that key is large enough for the signature algorithm */
3237 EVP_PKEY *pkey = s->cert->pkeys[sig_idx].privatekey;
3239 if (!rsa_pss_check_min_key_size(s->ctx, pkey, lu))
3242 if (curve == -1 || lu->curve == curve)
3245 #ifndef OPENSSL_NO_GOST
3247 * Some Windows-based implementations do not send GOST algorithms indication
3248 * in supported_algorithms extension, so when we have GOST-based ciphersuite,
3249 * we have to assume GOST support.
3251 if (i == s->shared_sigalgslen && s->s3.tmp.new_cipher->algorithm_auth & (SSL_aGOST01 | SSL_aGOST12)) {
3252 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
3255 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3256 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
3260 sig_idx = lu->sig_idx;
3264 if (i == s->shared_sigalgslen) {
3267 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3268 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
3273 * If we have no sigalg use defaults
3275 const uint16_t *sent_sigs;
3276 size_t sent_sigslen;
3278 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
3281 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3282 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
3286 /* Check signature matches a type we sent */
3287 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
3288 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
3289 if (lu->sigalg == *sent_sigs
3290 && has_usable_cert(s, lu, lu->sig_idx))
3293 if (i == sent_sigslen) {
3296 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
3297 SSL_R_WRONG_SIGNATURE_TYPE);
3302 if ((lu = tls1_get_legacy_sigalg(s, -1)) == NULL) {
3305 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
3306 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
3312 sig_idx = lu->sig_idx;
3313 s->s3.tmp.cert = &s->cert->pkeys[sig_idx];
3314 s->cert->key = s->s3.tmp.cert;
3315 s->s3.tmp.sigalg = lu;
3319 int SSL_CTX_set_tlsext_max_fragment_length(SSL_CTX *ctx, uint8_t mode)
3321 if (mode != TLSEXT_max_fragment_length_DISABLED
3322 && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
3323 ERR_raise(ERR_LIB_SSL, SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
3327 ctx->ext.max_fragment_len_mode = mode;
3331 int SSL_set_tlsext_max_fragment_length(SSL *ssl, uint8_t mode)
3333 if (mode != TLSEXT_max_fragment_length_DISABLED
3334 && !IS_MAX_FRAGMENT_LENGTH_EXT_VALID(mode)) {
3335 ERR_raise(ERR_LIB_SSL, SSL_R_SSL3_EXT_INVALID_MAX_FRAGMENT_LENGTH);
3339 ssl->ext.max_fragment_len_mode = mode;
3343 uint8_t SSL_SESSION_get_max_fragment_length(const SSL_SESSION *session)
3345 return session->ext.max_fragment_len_mode;
3349 * Helper functions for HMAC access with legacy support included.
3351 SSL_HMAC *ssl_hmac_new(const SSL_CTX *ctx)
3353 SSL_HMAC *ret = OPENSSL_zalloc(sizeof(*ret));
3354 EVP_MAC *mac = NULL;
3358 #ifndef OPENSSL_NO_DEPRECATED_3_0
3359 if (ctx->ext.ticket_key_evp_cb == NULL
3360 && ctx->ext.ticket_key_cb != NULL) {
3361 if (!ssl_hmac_old_new(ret))
3366 mac = EVP_MAC_fetch(ctx->libctx, "HMAC", ctx->propq);
3367 if (mac == NULL || (ret->ctx = EVP_MAC_CTX_new(mac)) == NULL)
3372 EVP_MAC_CTX_free(ret->ctx);
3378 void ssl_hmac_free(SSL_HMAC *ctx)
3381 EVP_MAC_CTX_free(ctx->ctx);
3382 #ifndef OPENSSL_NO_DEPRECATED_3_0
3383 ssl_hmac_old_free(ctx);
3389 EVP_MAC_CTX *ssl_hmac_get0_EVP_MAC_CTX(SSL_HMAC *ctx)
3394 int ssl_hmac_init(SSL_HMAC *ctx, void *key, size_t len, char *md)
3396 OSSL_PARAM params[3], *p = params;
3398 if (ctx->ctx != NULL) {
3399 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, md, 0);
3400 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, key, len);
3401 *p = OSSL_PARAM_construct_end();
3402 if (EVP_MAC_CTX_set_params(ctx->ctx, params) && EVP_MAC_init(ctx->ctx))
3405 #ifndef OPENSSL_NO_DEPRECATED_3_0
3406 if (ctx->old_ctx != NULL)
3407 return ssl_hmac_old_init(ctx, key, len, md);
3412 int ssl_hmac_update(SSL_HMAC *ctx, const unsigned char *data, size_t len)
3414 if (ctx->ctx != NULL)
3415 return EVP_MAC_update(ctx->ctx, data, len);
3416 #ifndef OPENSSL_NO_DEPRECATED_3_0
3417 if (ctx->old_ctx != NULL)
3418 return ssl_hmac_old_update(ctx, data, len);
3423 int ssl_hmac_final(SSL_HMAC *ctx, unsigned char *md, size_t *len,
3426 if (ctx->ctx != NULL)
3427 return EVP_MAC_final(ctx->ctx, md, len, max_size);
3428 #ifndef OPENSSL_NO_DEPRECATED_3_0
3429 if (ctx->old_ctx != NULL)
3430 return ssl_hmac_old_final(ctx, md, len);
3435 size_t ssl_hmac_size(const SSL_HMAC *ctx)
3437 if (ctx->ctx != NULL)
3438 return EVP_MAC_CTX_get_mac_size(ctx->ctx);
3439 #ifndef OPENSSL_NO_DEPRECATED_3_0
3440 if (ctx->old_ctx != NULL)
3441 return ssl_hmac_old_size(ctx);
3446 int ssl_get_EC_curve_nid(const EVP_PKEY *pkey)
3448 char gname[OSSL_MAX_NAME_SIZE];
3450 if (EVP_PKEY_get_group_name(pkey, gname, sizeof(gname), NULL) > 0)
3451 return OBJ_txt2nid(gname);