2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/objects.h>
13 #include <openssl/evp.h>
14 #include <openssl/hmac.h>
15 #include <openssl/ocsp.h>
16 #include <openssl/conf.h>
17 #include <openssl/x509v3.h>
18 #include <openssl/dh.h>
19 #include <openssl/bn.h>
21 #include <openssl/ct.h>
23 SSL3_ENC_METHOD const TLSv1_enc_data = {
27 tls1_generate_master_secret,
28 tls1_change_cipher_state,
29 tls1_final_finish_mac,
30 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
31 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
33 tls1_export_keying_material,
35 ssl3_set_handshake_header,
36 tls_close_construct_packet,
40 SSL3_ENC_METHOD const TLSv1_1_enc_data = {
44 tls1_generate_master_secret,
45 tls1_change_cipher_state,
46 tls1_final_finish_mac,
47 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
48 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
50 tls1_export_keying_material,
51 SSL_ENC_FLAG_EXPLICIT_IV,
52 ssl3_set_handshake_header,
53 tls_close_construct_packet,
57 SSL3_ENC_METHOD const TLSv1_2_enc_data = {
61 tls1_generate_master_secret,
62 tls1_change_cipher_state,
63 tls1_final_finish_mac,
64 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
65 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
67 tls1_export_keying_material,
68 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
69 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
70 ssl3_set_handshake_header,
71 tls_close_construct_packet,
75 SSL3_ENC_METHOD const TLSv1_3_enc_data = {
78 tls13_setup_key_block,
79 tls13_generate_master_secret,
80 tls13_change_cipher_state,
81 tls13_final_finish_mac,
82 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
83 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
85 tls1_export_keying_material,
86 SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
87 ssl3_set_handshake_header,
88 tls_close_construct_packet,
92 long tls1_default_timeout(void)
95 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
96 * http, the cache would over fill
105 s->method->ssl_clear(s);
109 void tls1_free(SSL *s)
111 OPENSSL_free(s->ext.session_ticket);
115 void tls1_clear(SSL *s)
118 if (s->method->version == TLS_ANY_VERSION)
119 s->version = TLS_MAX_VERSION;
121 s->version = s->method->version;
124 #ifndef OPENSSL_NO_EC
127 int nid; /* Curve NID */
128 int secbits; /* Bits of security (from SP800-57) */
129 unsigned int flags; /* Flags: currently just field type */
133 * Table of curve information.
134 * Do not delete entries or reorder this array! It is used as a lookup
135 * table: the index of each entry is one less than the TLS curve id.
137 static const tls_curve_info nid_list[] = {
138 {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
139 {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
140 {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
141 {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
142 {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
143 {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
144 {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
145 {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
146 {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
147 {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
148 {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
149 {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
150 {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
151 {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
152 {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
153 {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
154 {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
155 {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
156 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
157 {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
158 {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
159 {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
160 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
161 {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
162 {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
163 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
164 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
165 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
166 {NID_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
169 static const unsigned char ecformats_default[] = {
170 TLSEXT_ECPOINTFORMAT_uncompressed,
171 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
172 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
175 /* The default curves */
176 static const unsigned char eccurves_default[] = {
177 0, 29, /* X25519 (29) */
178 0, 23, /* secp256r1 (23) */
179 0, 25, /* secp521r1 (25) */
180 0, 24, /* secp384r1 (24) */
183 static const unsigned char suiteb_curves[] = {
184 0, TLSEXT_curve_P_256,
185 0, TLSEXT_curve_P_384
188 int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags)
190 const tls_curve_info *cinfo;
191 /* ECC curves from RFC 4492 and RFC 7027 */
192 if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list)))
194 cinfo = nid_list + curve_id - 1;
196 *pflags = cinfo->flags;
200 int tls1_ec_nid2curve_id(int nid)
203 for (i = 0; i < OSSL_NELEM(nid_list); i++) {
204 if (nid_list[i].nid == nid)
211 * Get curves list, if "sess" is set return client curves otherwise
213 * Sets |num_curves| to the number of curves in the list, i.e.,
214 * the length of |pcurves| is 2 * num_curves.
215 * Returns 1 on success and 0 if the client curves list has invalid format.
216 * The latter indicates an internal error: we should not be accepting such
217 * lists in the first place.
218 * TODO(emilia): we should really be storing the curves list in explicitly
219 * parsed form instead. (However, this would affect binary compatibility
220 * so cannot happen in the 1.0.x series.)
222 int tls1_get_curvelist(SSL *s, int sess, const unsigned char **pcurves,
225 size_t pcurveslen = 0;
228 *pcurves = s->session->ext.supportedgroups;
229 pcurveslen = s->session->ext.supportedgroups_len;
231 /* For Suite B mode only include P-256, P-384 */
232 switch (tls1_suiteb(s)) {
233 case SSL_CERT_FLAG_SUITEB_128_LOS:
234 *pcurves = suiteb_curves;
235 pcurveslen = sizeof(suiteb_curves);
238 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
239 *pcurves = suiteb_curves;
243 case SSL_CERT_FLAG_SUITEB_192_LOS:
244 *pcurves = suiteb_curves + 2;
248 *pcurves = s->ext.supportedgroups;
249 pcurveslen = s->ext.supportedgroups_len;
252 *pcurves = eccurves_default;
253 pcurveslen = sizeof(eccurves_default);
257 /* We do not allow odd length arrays to enter the system. */
258 if (pcurveslen & 1) {
259 SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
263 *num_curves = pcurveslen / 2;
267 /* See if curve is allowed by security callback */
268 int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
270 const tls_curve_info *cinfo;
273 if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list)))
275 cinfo = &nid_list[curve[1] - 1];
276 # ifdef OPENSSL_NO_EC2M
277 if (cinfo->flags & TLS_CURVE_CHAR2)
280 return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
283 /* Check a curve is one of our preferences */
284 int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
286 const unsigned char *curves;
287 size_t num_curves, i;
288 unsigned int suiteb_flags = tls1_suiteb(s);
289 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
291 /* Check curve matches Suite B preferences */
293 unsigned long cid = s->s3->tmp.new_cipher->id;
296 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
297 if (p[2] != TLSEXT_curve_P_256)
299 } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
300 if (p[2] != TLSEXT_curve_P_384)
302 } else /* Should never happen */
305 if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
307 for (i = 0; i < num_curves; i++, curves += 2) {
308 if (p[1] == curves[0] && p[2] == curves[1])
309 return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
315 * For nmatch >= 0, return the NID of the |nmatch|th shared group or NID_undef
316 * if there is no match.
317 * For nmatch == -1, return number of matches
318 * For nmatch == -2, return the NID of the group to use for
319 * an EC tmp key, or NID_undef if there is no match.
321 int tls1_shared_group(SSL *s, int nmatch)
323 const unsigned char *pref, *supp;
324 size_t num_pref, num_supp, i, j;
327 /* Can't do anything on client side */
331 if (tls1_suiteb(s)) {
333 * For Suite B ciphersuite determines curve: we already know
334 * these are acceptable due to previous checks.
336 unsigned long cid = s->s3->tmp.new_cipher->id;
338 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
339 return NID_X9_62_prime256v1; /* P-256 */
340 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
341 return NID_secp384r1; /* P-384 */
342 /* Should never happen */
345 /* If not Suite B just return first preference shared curve */
349 * Avoid truncation. tls1_get_curvelist takes an int
350 * but s->options is a long...
352 if (!tls1_get_curvelist(s,
353 (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0,
355 /* In practice, NID_undef == 0 but let's be precise. */
356 return nmatch == -1 ? 0 : NID_undef;
357 if (!tls1_get_curvelist(s,
358 (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0,
360 return nmatch == -1 ? 0 : NID_undef;
362 for (k = 0, i = 0; i < num_pref; i++, pref += 2) {
363 const unsigned char *tsupp = supp;
365 for (j = 0; j < num_supp; j++, tsupp += 2) {
366 if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) {
367 if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
370 int id = (pref[0] << 8) | pref[1];
372 return tls1_ec_curve_id2nid(id, NULL);
380 /* Out of range (nmatch > k). */
384 int tls1_set_groups(unsigned char **pext, size_t *pextlen,
385 int *groups, size_t ngroups)
387 unsigned char *glist, *p;
390 * Bitmap of groups included to detect duplicates: only works while group
393 unsigned long dup_list = 0;
394 glist = OPENSSL_malloc(ngroups * 2);
397 for (i = 0, p = glist; i < ngroups; i++) {
398 unsigned long idmask;
400 /* TODO(TLS1.3): Convert for DH groups */
401 id = tls1_ec_nid2curve_id(groups[i]);
403 if (!id || (dup_list & idmask)) {
412 *pextlen = ngroups * 2;
416 # define MAX_CURVELIST 28
420 int nid_arr[MAX_CURVELIST];
423 static int nid_cb(const char *elem, int len, void *arg)
425 nid_cb_st *narg = arg;
431 if (narg->nidcnt == MAX_CURVELIST)
433 if (len > (int)(sizeof(etmp) - 1))
435 memcpy(etmp, elem, len);
437 nid = EC_curve_nist2nid(etmp);
438 if (nid == NID_undef)
439 nid = OBJ_sn2nid(etmp);
440 if (nid == NID_undef)
441 nid = OBJ_ln2nid(etmp);
442 if (nid == NID_undef)
444 for (i = 0; i < narg->nidcnt; i++)
445 if (narg->nid_arr[i] == nid)
447 narg->nid_arr[narg->nidcnt++] = nid;
451 /* Set groups based on a colon separate list */
452 int tls1_set_groups_list(unsigned char **pext, size_t *pextlen, const char *str)
456 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
460 return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
463 /* For an EC key set TLS id and required compression based on parameters */
464 static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
471 /* Determine if it is a prime field */
472 grp = EC_KEY_get0_group(ec);
475 /* Determine curve ID */
476 id = EC_GROUP_get_curve_name(grp);
477 id = tls1_ec_nid2curve_id(id);
478 /* If no id return error: we don't support arbitrary explicit curves */
482 curve_id[1] = (unsigned char)id;
484 if (EC_KEY_get0_public_key(ec) == NULL)
486 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
487 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
489 if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)
490 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
492 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
498 /* Check an EC key is compatible with extensions */
499 static int tls1_check_ec_key(SSL *s,
500 unsigned char *curve_id, unsigned char *comp_id)
502 const unsigned char *pformats, *pcurves;
503 size_t num_formats, num_curves, i;
506 * If point formats extension present check it, otherwise everything is
507 * supported (see RFC4492).
509 if (comp_id && s->session->ext.ecpointformats) {
510 pformats = s->session->ext.ecpointformats;
511 num_formats = s->session->ext.ecpointformats_len;
512 for (i = 0; i < num_formats; i++, pformats++) {
513 if (*comp_id == *pformats)
516 if (i == num_formats)
521 /* Check curve is consistent with client and server preferences */
522 for (j = 0; j <= 1; j++) {
523 if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
525 if (j == 1 && num_curves == 0) {
527 * If we've not received any curves then skip this check.
528 * RFC 4492 does not require the supported elliptic curves extension
529 * so if it is not sent we can just choose any curve.
530 * It is invalid to send an empty list in the elliptic curves
531 * extension, so num_curves == 0 always means no extension.
535 for (i = 0; i < num_curves; i++, pcurves += 2) {
536 if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1])
541 /* For clients can only check sent curve list */
548 void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
552 * If we have a custom point format list use it otherwise use default
554 if (s->ext.ecpointformats) {
555 *pformats = s->ext.ecpointformats;
556 *num_formats = s->ext.ecpointformats_len;
558 *pformats = ecformats_default;
559 /* For Suite B we don't support char2 fields */
561 *num_formats = sizeof(ecformats_default) - 1;
563 *num_formats = sizeof(ecformats_default);
568 * Check cert parameters compatible with extensions: currently just checks EC
569 * certificates have compatible curves and compression.
571 static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
573 unsigned char comp_id, curve_id[2];
576 pkey = X509_get0_pubkey(x);
579 /* If not EC nothing to do */
580 if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
582 rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey));
586 * Can't check curve_id for client certs as we don't have a supported
589 rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
593 * Special case for suite B. We *MUST* sign using SHA256+P-256 or
596 if (check_ee_md && tls1_suiteb(s)) {
602 /* Check to see we have necessary signing algorithm */
603 if (curve_id[1] == TLSEXT_curve_P_256)
604 check_md = NID_ecdsa_with_SHA256;
605 else if (curve_id[1] == TLSEXT_curve_P_384)
606 check_md = NID_ecdsa_with_SHA384;
608 return 0; /* Should never happen */
609 for (i = 0; i < c->shared_sigalgslen; i++)
610 if (check_md == c->shared_sigalgs[i]->sigandhash)
612 if (i == c->shared_sigalgslen)
618 # ifndef OPENSSL_NO_EC
620 * tls1_check_ec_tmp_key - Check EC temporary key compatibility
622 * @cid: Cipher ID we're considering using
624 * Checks that the kECDHE cipher suite we're considering using
625 * is compatible with the client extensions.
627 * Returns 0 when the cipher can't be used or 1 when it can.
629 int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
632 * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
635 if (tls1_suiteb(s)) {
636 unsigned char curve_id[2];
637 /* Curve to check determined by ciphersuite */
638 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
639 curve_id[1] = TLSEXT_curve_P_256;
640 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
641 curve_id[1] = TLSEXT_curve_P_384;
645 /* Check this curve is acceptable */
646 if (!tls1_check_ec_key(s, curve_id, NULL))
650 /* Need a shared curve */
651 if (tls1_shared_group(s, 0))
655 # endif /* OPENSSL_NO_EC */
659 static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
664 #endif /* OPENSSL_NO_EC */
666 /* Default sigalg schemes */
667 static const uint16_t tls12_sigalgs[] = {
668 #ifndef OPENSSL_NO_EC
669 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
670 TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
671 TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
674 TLSEXT_SIGALG_rsa_pss_sha256,
675 TLSEXT_SIGALG_rsa_pss_sha384,
676 TLSEXT_SIGALG_rsa_pss_sha512,
678 TLSEXT_SIGALG_rsa_pkcs1_sha256,
679 TLSEXT_SIGALG_rsa_pkcs1_sha384,
680 TLSEXT_SIGALG_rsa_pkcs1_sha512,
682 #ifndef OPENSSL_NO_EC
683 TLSEXT_SIGALG_ecdsa_sha1,
685 TLSEXT_SIGALG_rsa_pkcs1_sha1,
686 #ifndef OPENSSL_NO_DSA
687 TLSEXT_SIGALG_dsa_sha1,
689 TLSEXT_SIGALG_dsa_sha256,
690 TLSEXT_SIGALG_dsa_sha384,
691 TLSEXT_SIGALG_dsa_sha512
695 #ifndef OPENSSL_NO_EC
696 static const uint16_t suiteb_sigalgs[] = {
697 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
698 TLSEXT_SIGALG_ecdsa_secp384r1_sha384
702 static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
703 #ifndef OPENSSL_NO_EC
704 {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
705 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
706 NID_ecdsa_with_SHA256, NID_X9_62_prime256v1},
707 {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
708 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
709 NID_ecdsa_with_SHA384, NID_secp384r1},
710 {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
711 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
712 NID_ecdsa_with_SHA512, NID_secp521r1},
713 {NULL, TLSEXT_SIGALG_ecdsa_sha1,
714 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
715 NID_ecdsa_with_SHA1, NID_undef},
717 {"rsa_pss_sha256", TLSEXT_SIGALG_rsa_pss_sha256,
718 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
719 NID_undef, NID_undef},
720 {"rsa_pss_sha384", TLSEXT_SIGALG_rsa_pss_sha384,
721 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
722 NID_undef, NID_undef},
723 {"rsa_pss_sha512", TLSEXT_SIGALG_rsa_pss_sha512,
724 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
725 NID_undef, NID_undef},
726 {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
727 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
728 NID_sha256WithRSAEncryption, NID_undef},
729 {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
730 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
731 NID_sha384WithRSAEncryption, NID_undef},
732 {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
733 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
734 NID_sha512WithRSAEncryption, NID_undef},
735 {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
736 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
737 NID_sha1WithRSAEncryption, NID_undef},
738 #ifndef OPENSSL_NO_DSA
739 {NULL, TLSEXT_SIGALG_dsa_sha256,
740 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
741 NID_dsa_with_SHA256, NID_undef},
742 {NULL, TLSEXT_SIGALG_dsa_sha384,
743 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
744 NID_undef, NID_undef},
745 {NULL, TLSEXT_SIGALG_dsa_sha512,
746 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
747 NID_undef, NID_undef},
748 {NULL, TLSEXT_SIGALG_dsa_sha1,
749 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
750 NID_dsaWithSHA1, NID_undef},
752 #ifndef OPENSSL_NO_GOST
753 {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
754 NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
755 NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
756 NID_undef, NID_undef},
757 {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
758 NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
759 NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
760 NID_undef, NID_undef},
761 {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
762 NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
763 NID_id_GostR3410_2001, SSL_PKEY_GOST01,
764 NID_undef, NID_undef}
767 /* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
768 static const SIGALG_LOOKUP legacy_rsa_sigalg = {
769 "rsa_pkcs1_md5_sha1", 0,
770 NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
771 EVP_PKEY_RSA, SSL_PKEY_RSA,
776 * Default signature algorithm values used if signature algorithms not present.
777 * From RFC5246. Note: order must match certificate index order.
779 static const uint16_t tls_default_sigalg[] = {
780 TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
781 TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
782 TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
783 TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
784 TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256, /* SSL_PKEY_GOST12_256 */
785 TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512 /* SSL_PKEY_GOST12_512 */
788 /* Lookup TLS signature algorithm */
789 static const SIGALG_LOOKUP *tls1_lookup_sigalg(uint16_t sigalg)
792 const SIGALG_LOOKUP *s;
794 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
796 if (s->sigalg == sigalg)
802 * Return a signature algorithm for TLS < 1.2 where the signature type
803 * is fixed by the certificate type.
805 static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
807 if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
809 if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
810 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(tls_default_sigalg[idx]);
812 if (lu == NULL || ssl_md(lu->hash_idx) == NULL) {
817 return &legacy_rsa_sigalg;
819 /* Set peer sigalg based key type */
820 int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
822 int idx = ssl_cert_type(NULL, pkey);
824 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, idx);
827 s->s3->tmp.peer_sigalg = lu;
831 static int tls_sigalg_get_sig(uint16_t sigalg)
833 const SIGALG_LOOKUP *r = tls1_lookup_sigalg(sigalg);
835 return r != NULL ? r->sig : 0;
838 size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
841 * If Suite B mode use Suite B sigalgs only, ignore any other
844 #ifndef OPENSSL_NO_EC
845 switch (tls1_suiteb(s)) {
846 case SSL_CERT_FLAG_SUITEB_128_LOS:
847 *psigs = suiteb_sigalgs;
848 return OSSL_NELEM(suiteb_sigalgs);
850 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
851 *psigs = suiteb_sigalgs;
854 case SSL_CERT_FLAG_SUITEB_192_LOS:
855 *psigs = suiteb_sigalgs + 1;
860 * We use client_sigalgs (if not NULL) if we're a server
861 * and sending a certificate request or if we're a client and
862 * determining which shared algorithm to use.
864 if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
865 *psigs = s->cert->client_sigalgs;
866 return s->cert->client_sigalgslen;
867 } else if (s->cert->conf_sigalgs) {
868 *psigs = s->cert->conf_sigalgs;
869 return s->cert->conf_sigalgslen;
871 *psigs = tls12_sigalgs;
872 return OSSL_NELEM(tls12_sigalgs);
877 * Check signature algorithm is consistent with sent supported signature
878 * algorithms and if so set relevant digest and signature scheme in
881 int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
883 const uint16_t *sent_sigs;
884 const EVP_MD *md = NULL;
886 size_t sent_sigslen, i;
887 int pkeyid = EVP_PKEY_id(pkey);
888 const SIGALG_LOOKUP *lu;
890 /* Should never happen */
893 if (SSL_IS_TLS13(s)) {
894 /* Disallow DSA for TLS 1.3 */
895 if (pkeyid == EVP_PKEY_DSA) {
896 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
899 /* Only allow PSS for TLS 1.3 */
900 if (pkeyid == EVP_PKEY_RSA)
901 pkeyid = EVP_PKEY_RSA_PSS;
903 lu = tls1_lookup_sigalg(sig);
905 * Check sigalgs is known and key type is consistent with signature:
906 * RSA keys can be used for RSA-PSS
908 if (lu == NULL || (pkeyid != lu->sig
909 && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
910 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
913 #ifndef OPENSSL_NO_EC
914 if (pkeyid == EVP_PKEY_EC) {
915 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
916 int curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
918 if (SSL_IS_TLS13(s)) {
919 /* For TLS 1.3 check curve matches signature algorithm */
921 if (lu->curve != NID_undef && curve != lu->curve) {
922 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
926 unsigned char curve_id[2], comp_id;
928 /* Check compression and curve matches extensions */
929 if (!tls1_set_ec_id(curve_id, &comp_id, ec))
931 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) {
932 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
935 if (tls1_suiteb(s)) {
936 /* Check sigalg matches a permissible Suite B value */
937 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
938 && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
939 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
940 SSL_R_WRONG_SIGNATURE_TYPE);
944 * Suite B also requires P-256+SHA256 and P-384+SHA384:
945 * this matches the TLS 1.3 requirements so we can just
946 * check the curve is the expected TLS 1.3 value.
947 * If this fails an inappropriate digest is being used.
949 if (curve != lu->curve) {
950 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
951 SSL_R_ILLEGAL_SUITEB_DIGEST);
956 } else if (tls1_suiteb(s)) {
961 /* Check signature matches a type we sent */
962 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
963 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
964 if (sig == *sent_sigs)
967 /* Allow fallback to SHA1 if not strict mode */
968 if (i == sent_sigslen && (lu->hash != NID_sha1
969 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
970 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
973 md = ssl_md(lu->hash_idx);
975 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST);
979 * Make sure security callback allows algorithm. For historical reasons we
980 * have to pass the sigalg as a two byte char array.
982 sigalgstr[0] = (sig >> 8) & 0xff;
983 sigalgstr[1] = sig & 0xff;
984 if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
985 EVP_MD_size(md) * 4, EVP_MD_type(md),
986 (void *)sigalgstr)) {
987 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
990 /* Store the sigalg the peer uses */
991 s->s3->tmp.peer_sigalg = lu;
995 int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
997 if (s->s3->tmp.peer_sigalg == NULL)
999 *pnid = s->s3->tmp.peer_sigalg->sig;
1004 * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1005 * supported, doesn't appear in supported signature algorithms, isn't supported
1006 * by the enabled protocol versions or by the security level.
1008 * This function should only be used for checking which ciphers are supported
1011 * Call ssl_cipher_disabled() to check that it's enabled or not.
1013 void ssl_set_client_disabled(SSL *s)
1015 s->s3->tmp.mask_a = 0;
1016 s->s3->tmp.mask_k = 0;
1017 ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
1018 ssl_get_client_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver);
1019 #ifndef OPENSSL_NO_PSK
1020 /* with PSK there must be client callback set */
1021 if (!s->psk_client_callback) {
1022 s->s3->tmp.mask_a |= SSL_aPSK;
1023 s->s3->tmp.mask_k |= SSL_PSK;
1025 #endif /* OPENSSL_NO_PSK */
1026 #ifndef OPENSSL_NO_SRP
1027 if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
1028 s->s3->tmp.mask_a |= SSL_aSRP;
1029 s->s3->tmp.mask_k |= SSL_kSRP;
1035 * ssl_cipher_disabled - check that a cipher is disabled or not
1036 * @s: SSL connection that you want to use the cipher on
1037 * @c: cipher to check
1038 * @op: Security check that you want to do
1040 * Returns 1 when it's disabled, 0 when enabled.
1042 int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op)
1044 if (c->algorithm_mkey & s->s3->tmp.mask_k
1045 || c->algorithm_auth & s->s3->tmp.mask_a)
1047 if (s->s3->tmp.max_ver == 0)
1049 if (!SSL_IS_DTLS(s) && ((c->min_tls > s->s3->tmp.max_ver)
1050 || (c->max_tls < s->s3->tmp.min_ver)))
1052 if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
1053 || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
1056 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1059 int tls_use_ticket(SSL *s)
1061 if ((s->options & SSL_OP_NO_TICKET))
1063 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1066 int tls1_set_server_sigalgs(SSL *s)
1071 /* Clear any shared signature algorithms */
1072 OPENSSL_free(s->cert->shared_sigalgs);
1073 s->cert->shared_sigalgs = NULL;
1074 s->cert->shared_sigalgslen = 0;
1075 /* Clear certificate validity flags */
1076 for (i = 0; i < SSL_PKEY_NUM; i++)
1077 s->s3->tmp.valid_flags[i] = 0;
1079 * If peer sent no signature algorithms check to see if we support
1080 * the default algorithm for each certificate type
1082 if (s->s3->tmp.peer_sigalgs == NULL) {
1083 const uint16_t *sent_sigs;
1084 size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
1086 for (i = 0; i < SSL_PKEY_NUM; i++) {
1087 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1092 /* Check default matches a type we sent */
1093 for (j = 0; j < sent_sigslen; j++) {
1094 if (lu->sigalg == sent_sigs[j]) {
1095 s->s3->tmp.valid_flags[i] = CERT_PKEY_SIGN;
1103 if (!tls1_process_sigalgs(s)) {
1104 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE);
1105 al = SSL_AD_INTERNAL_ERROR;
1108 if (s->cert->shared_sigalgs != NULL)
1110 /* Fatal error is no shared signature algorithms */
1111 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
1112 al = SSL_AD_ILLEGAL_PARAMETER;
1114 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1119 * Gets the ticket information supplied by the client if any.
1121 * hello: The parsed ClientHello data
1122 * ret: (output) on return, if a ticket was decrypted, then this is set to
1123 * point to the resulting session.
1125 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
1126 * ciphersuite, in which case we have no use for session tickets and one will
1127 * never be decrypted, nor will s->ext.ticket_expected be set to 1.
1130 * -1: fatal error, either from parsing or decrypting the ticket.
1131 * 0: no ticket was found (or was ignored, based on settings).
1132 * 1: a zero length extension was found, indicating that the client supports
1133 * session tickets but doesn't currently have one to offer.
1134 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
1135 * couldn't be decrypted because of a non-fatal error.
1136 * 3: a ticket was successfully decrypted and *ret was set.
1139 * Sets s->ext.ticket_expected to 1 if the server will have to issue
1140 * a new session ticket to the client because the client indicated support
1141 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
1142 * a session ticket or we couldn't use the one it gave us, or if
1143 * s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1144 * Otherwise, s->ext.ticket_expected is set to 0.
1146 TICKET_RETURN tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1151 RAW_EXTENSION *ticketext;
1154 s->ext.ticket_expected = 0;
1157 * If tickets disabled or not supported by the protocol version
1158 * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
1161 if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
1164 ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1165 if (!ticketext->present)
1168 size = PACKET_remaining(&ticketext->data);
1171 * The client will accept a ticket but doesn't currently have
1174 s->ext.ticket_expected = 1;
1175 return TICKET_EMPTY;
1177 if (s->ext.session_secret_cb) {
1179 * Indicate that the ticket couldn't be decrypted rather than
1180 * generating the session from ticket now, trigger
1181 * abbreviated handshake based on external mechanism to
1182 * calculate the master secret later.
1184 return TICKET_NO_DECRYPT;
1187 retv = tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1188 hello->session_id, hello->session_id_len, ret);
1190 case TICKET_NO_DECRYPT:
1191 s->ext.ticket_expected = 1;
1192 return TICKET_NO_DECRYPT;
1194 case TICKET_SUCCESS:
1195 return TICKET_SUCCESS;
1197 case TICKET_SUCCESS_RENEW:
1198 s->ext.ticket_expected = 1;
1199 return TICKET_SUCCESS;
1202 return TICKET_FATAL_ERR_OTHER;
1207 * tls_decrypt_ticket attempts to decrypt a session ticket.
1209 * etick: points to the body of the session ticket extension.
1210 * eticklen: the length of the session tickets extension.
1211 * sess_id: points at the session ID.
1212 * sesslen: the length of the session ID.
1213 * psess: (output) on return, if a ticket was decrypted, then this is set to
1214 * point to the resulting session.
1216 TICKET_RETURN tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1217 size_t eticklen, const unsigned char *sess_id,
1218 size_t sesslen, SSL_SESSION **psess)
1221 unsigned char *sdec;
1222 const unsigned char *p;
1223 int slen, renew_ticket = 0, declen;
1224 TICKET_RETURN ret = TICKET_FATAL_ERR_OTHER;
1226 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1227 HMAC_CTX *hctx = NULL;
1228 EVP_CIPHER_CTX *ctx;
1229 SSL_CTX *tctx = s->session_ctx;
1231 /* Initialize session ticket encryption and HMAC contexts */
1232 hctx = HMAC_CTX_new();
1234 return TICKET_FATAL_ERR_MALLOC;
1235 ctx = EVP_CIPHER_CTX_new();
1237 ret = TICKET_FATAL_ERR_MALLOC;
1240 if (tctx->ext.ticket_key_cb) {
1241 unsigned char *nctick = (unsigned char *)etick;
1242 int rv = tctx->ext.ticket_key_cb(s, nctick, nctick + 16,
1247 ret = TICKET_NO_DECRYPT;
1253 /* Check key name matches */
1254 if (memcmp(etick, tctx->ext.tick_key_name,
1255 sizeof(tctx->ext.tick_key_name)) != 0) {
1256 ret = TICKET_NO_DECRYPT;
1259 if (HMAC_Init_ex(hctx, tctx->ext.tick_hmac_key,
1260 sizeof(tctx->ext.tick_hmac_key),
1261 EVP_sha256(), NULL) <= 0
1262 || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
1263 tctx->ext.tick_aes_key,
1265 + sizeof(tctx->ext.tick_key_name)) <= 0) {
1270 * Attempt to process session ticket, first conduct sanity and integrity
1273 mlen = HMAC_size(hctx);
1277 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1279 TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1280 ret = TICKET_NO_DECRYPT;
1284 /* Check HMAC of encrypted ticket */
1285 if (HMAC_Update(hctx, etick, eticklen) <= 0
1286 || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
1289 HMAC_CTX_free(hctx);
1290 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
1291 EVP_CIPHER_CTX_free(ctx);
1292 return TICKET_NO_DECRYPT;
1294 /* Attempt to decrypt session data */
1295 /* Move p after IV to start of encrypted ticket, update length */
1296 p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1297 eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1298 sdec = OPENSSL_malloc(eticklen);
1299 if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1300 (int)eticklen) <= 0) {
1301 EVP_CIPHER_CTX_free(ctx);
1303 return TICKET_FATAL_ERR_OTHER;
1305 if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
1306 EVP_CIPHER_CTX_free(ctx);
1308 return TICKET_NO_DECRYPT;
1311 EVP_CIPHER_CTX_free(ctx);
1315 sess = d2i_SSL_SESSION(NULL, &p, slen);
1318 /* Some additional consistency checks */
1319 if (p != sdec + slen || sess->session_id_length != 0) {
1320 SSL_SESSION_free(sess);
1324 * The session ID, if non-empty, is used by some clients to detect
1325 * that the ticket has been accepted. So we copy it to the session
1326 * structure. If it is empty set length to zero as required by
1330 memcpy(sess->session_id, sess_id, sesslen);
1331 sess->session_id_length = sesslen;
1334 return TICKET_SUCCESS_RENEW;
1336 return TICKET_SUCCESS;
1340 * For session parse failure, indicate that we need to send a new ticket.
1342 return TICKET_NO_DECRYPT;
1344 EVP_CIPHER_CTX_free(ctx);
1345 HMAC_CTX_free(hctx);
1349 static int tls12_get_pkey_idx(int sig_nid)
1352 #ifndef OPENSSL_NO_RSA
1354 return SSL_PKEY_RSA;
1356 * For now return RSA key for PSS. When we support PSS only keys
1357 * this will need to be updated.
1359 case EVP_PKEY_RSA_PSS:
1360 return SSL_PKEY_RSA;
1362 #ifndef OPENSSL_NO_DSA
1364 return SSL_PKEY_DSA_SIGN;
1366 #ifndef OPENSSL_NO_EC
1368 return SSL_PKEY_ECC;
1370 #ifndef OPENSSL_NO_GOST
1371 case NID_id_GostR3410_2001:
1372 return SSL_PKEY_GOST01;
1374 case NID_id_GostR3410_2012_256:
1375 return SSL_PKEY_GOST12_256;
1377 case NID_id_GostR3410_2012_512:
1378 return SSL_PKEY_GOST12_512;
1384 /* Check to see if a signature algorithm is allowed */
1385 static int tls12_sigalg_allowed(SSL *s, int op, uint16_t ptmp)
1387 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(ptmp);
1388 unsigned char sigalgstr[2];
1391 /* See if sigalgs is recognised and if hash is enabled */
1392 if (lu == NULL || ssl_md(lu->hash_idx) == NULL)
1394 /* See if public key algorithm allowed */
1395 if (tls12_get_pkey_idx(lu->sig) == -1)
1397 /* Security bits: half digest bits */
1398 secbits = EVP_MD_size(ssl_md(lu->hash_idx)) * 4;
1399 /* Finally see if security callback allows it */
1400 sigalgstr[0] = (ptmp >> 8) & 0xff;
1401 sigalgstr[1] = ptmp & 0xff;
1402 return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
1406 * Get a mask of disabled public key algorithms based on supported signature
1407 * algorithms. For example if no signature algorithm supports RSA then RSA is
1411 void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
1413 const uint16_t *sigalgs;
1414 size_t i, sigalgslen;
1415 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
1417 * Now go through all signature algorithms seeing if we support any for
1418 * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
1419 * down calls to security callback only check if we have to.
1421 sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
1422 for (i = 0; i < sigalgslen; i ++, sigalgs++) {
1423 switch (tls_sigalg_get_sig(*sigalgs)) {
1424 #ifndef OPENSSL_NO_RSA
1425 /* Any RSA-PSS signature algorithms also mean we allow RSA */
1426 case EVP_PKEY_RSA_PSS:
1428 if (!have_rsa && tls12_sigalg_allowed(s, op, *sigalgs))
1432 #ifndef OPENSSL_NO_DSA
1434 if (!have_dsa && tls12_sigalg_allowed(s, op, *sigalgs))
1438 #ifndef OPENSSL_NO_EC
1440 if (!have_ecdsa && tls12_sigalg_allowed(s, op, *sigalgs))
1447 *pmask_a |= SSL_aRSA;
1449 *pmask_a |= SSL_aDSS;
1451 *pmask_a |= SSL_aECDSA;
1454 int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
1455 const uint16_t *psig, size_t psiglen)
1459 for (i = 0; i < psiglen; i++, psig++) {
1460 if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, *psig)) {
1461 if (!WPACKET_put_bytes_u16(pkt, *psig))
1468 /* Given preference and allowed sigalgs set shared sigalgs */
1469 static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
1470 const uint16_t *pref, size_t preflen,
1471 const uint16_t *allow, size_t allowlen)
1473 const uint16_t *ptmp, *atmp;
1474 size_t i, j, nmatch = 0;
1475 for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
1476 /* Skip disabled hashes or signature algorithms */
1477 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, *ptmp))
1479 for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
1480 if (*ptmp == *atmp) {
1483 *shsig = tls1_lookup_sigalg(*ptmp);
1493 /* Set shared signature algorithms for SSL structures */
1494 static int tls1_set_shared_sigalgs(SSL *s)
1496 const uint16_t *pref, *allow, *conf;
1497 size_t preflen, allowlen, conflen;
1499 const SIGALG_LOOKUP **salgs = NULL;
1501 unsigned int is_suiteb = tls1_suiteb(s);
1503 OPENSSL_free(c->shared_sigalgs);
1504 c->shared_sigalgs = NULL;
1505 c->shared_sigalgslen = 0;
1506 /* If client use client signature algorithms if not NULL */
1507 if (!s->server && c->client_sigalgs && !is_suiteb) {
1508 conf = c->client_sigalgs;
1509 conflen = c->client_sigalgslen;
1510 } else if (c->conf_sigalgs && !is_suiteb) {
1511 conf = c->conf_sigalgs;
1512 conflen = c->conf_sigalgslen;
1514 conflen = tls12_get_psigalgs(s, 0, &conf);
1515 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
1518 allow = s->s3->tmp.peer_sigalgs;
1519 allowlen = s->s3->tmp.peer_sigalgslen;
1523 pref = s->s3->tmp.peer_sigalgs;
1524 preflen = s->s3->tmp.peer_sigalgslen;
1526 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
1528 salgs = OPENSSL_malloc(nmatch * sizeof(*salgs));
1531 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
1535 c->shared_sigalgs = salgs;
1536 c->shared_sigalgslen = nmatch;
1540 /* Set preferred digest for each key type */
1542 int tls1_save_sigalgs(SSL *s, PACKET *pkt)
1548 /* Extension ignored for inappropriate versions */
1549 if (!SSL_USE_SIGALGS(s))
1551 /* Should never happen */
1555 size = PACKET_remaining(pkt);
1557 /* Invalid data length */
1558 if ((size & 1) != 0)
1563 OPENSSL_free(s->s3->tmp.peer_sigalgs);
1564 s->s3->tmp.peer_sigalgs = OPENSSL_malloc(size
1565 * sizeof(*s->s3->tmp.peer_sigalgs));
1566 if (s->s3->tmp.peer_sigalgs == NULL)
1568 s->s3->tmp.peer_sigalgslen = size;
1569 for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
1570 s->s3->tmp.peer_sigalgs[i] = stmp;
1578 int tls1_process_sigalgs(SSL *s)
1581 uint32_t *pvalid = s->s3->tmp.valid_flags;
1584 if (!tls1_set_shared_sigalgs(s))
1587 for (i = 0; i < SSL_PKEY_NUM; i++)
1590 for (i = 0; i < c->shared_sigalgslen; i++) {
1591 const SIGALG_LOOKUP *sigptr = c->shared_sigalgs[i];
1592 int idx = sigptr->sig_idx;
1594 /* Ignore PKCS1 based sig algs in TLSv1.3 */
1595 if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
1597 /* If not disabled indicate we can explicitly sign */
1598 if (pvalid[idx] == 0 && tls12_get_pkey_idx(sigptr->sig) != -1)
1599 pvalid[sigptr->sig_idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
1604 int SSL_get_sigalgs(SSL *s, int idx,
1605 int *psign, int *phash, int *psignhash,
1606 unsigned char *rsig, unsigned char *rhash)
1608 uint16_t *psig = s->s3->tmp.peer_sigalgs;
1609 size_t numsigalgs = s->s3->tmp.peer_sigalgslen;
1610 if (psig == NULL || numsigalgs > INT_MAX)
1613 const SIGALG_LOOKUP *lu;
1615 if (idx >= (int)numsigalgs)
1619 *rhash = (unsigned char)((*psig >> 8) & 0xff);
1621 *rsig = (unsigned char)(*psig & 0xff);
1622 lu = tls1_lookup_sigalg(*psig);
1624 *psign = lu != NULL ? lu->sig : NID_undef;
1626 *phash = lu != NULL ? lu->hash : NID_undef;
1627 if (psignhash != NULL)
1628 *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
1630 return (int)numsigalgs;
1633 int SSL_get_shared_sigalgs(SSL *s, int idx,
1634 int *psign, int *phash, int *psignhash,
1635 unsigned char *rsig, unsigned char *rhash)
1637 const SIGALG_LOOKUP *shsigalgs;
1638 if (s->cert->shared_sigalgs == NULL
1640 || idx >= (int)s->cert->shared_sigalgslen
1641 || s->cert->shared_sigalgslen > INT_MAX)
1643 shsigalgs = s->cert->shared_sigalgs[idx];
1645 *phash = shsigalgs->hash;
1647 *psign = shsigalgs->sig;
1648 if (psignhash != NULL)
1649 *psignhash = shsigalgs->sigandhash;
1651 *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
1653 *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
1654 return (int)s->cert->shared_sigalgslen;
1657 /* Maximum possible number of unique entries in sigalgs array */
1658 #define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
1662 int sigalgs[TLS_MAX_SIGALGCNT];
1665 static void get_sigorhash(int *psig, int *phash, const char *str)
1667 if (strcmp(str, "RSA") == 0) {
1668 *psig = EVP_PKEY_RSA;
1669 } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
1670 *psig = EVP_PKEY_RSA_PSS;
1671 } else if (strcmp(str, "DSA") == 0) {
1672 *psig = EVP_PKEY_DSA;
1673 } else if (strcmp(str, "ECDSA") == 0) {
1674 *psig = EVP_PKEY_EC;
1676 *phash = OBJ_sn2nid(str);
1677 if (*phash == NID_undef)
1678 *phash = OBJ_ln2nid(str);
1681 /* Maximum length of a signature algorithm string component */
1682 #define TLS_MAX_SIGSTRING_LEN 40
1684 static int sig_cb(const char *elem, int len, void *arg)
1686 sig_cb_st *sarg = arg;
1688 char etmp[TLS_MAX_SIGSTRING_LEN], *p;
1689 int sig_alg = NID_undef, hash_alg = NID_undef;
1692 if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
1694 if (len > (int)(sizeof(etmp) - 1))
1696 memcpy(etmp, elem, len);
1698 p = strchr(etmp, '+');
1699 /* See if we have a match for TLS 1.3 names */
1701 const SIGALG_LOOKUP *s;
1703 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1705 if (s->name != NULL && strcmp(etmp, s->name) == 0) {
1716 get_sigorhash(&sig_alg, &hash_alg, etmp);
1717 get_sigorhash(&sig_alg, &hash_alg, p);
1720 if (sig_alg == NID_undef || hash_alg == NID_undef)
1723 for (i = 0; i < sarg->sigalgcnt; i += 2) {
1724 if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg)
1727 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
1728 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
1733 * Set supported signature algorithms based on a colon separated list of the
1734 * form sig+hash e.g. RSA+SHA512:DSA+SHA512
1736 int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
1740 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
1744 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
1747 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
1749 uint16_t *sigalgs, *sptr;
1754 sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs));
1755 if (sigalgs == NULL)
1757 for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
1759 const SIGALG_LOOKUP *curr;
1760 int md_id = *psig_nids++;
1761 int sig_id = *psig_nids++;
1763 for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
1765 if (curr->hash == md_id && curr->sig == sig_id) {
1766 *sptr++ = curr->sigalg;
1771 if (j == OSSL_NELEM(sigalg_lookup_tbl))
1776 OPENSSL_free(c->client_sigalgs);
1777 c->client_sigalgs = sigalgs;
1778 c->client_sigalgslen = salglen / 2;
1780 OPENSSL_free(c->conf_sigalgs);
1781 c->conf_sigalgs = sigalgs;
1782 c->conf_sigalgslen = salglen / 2;
1788 OPENSSL_free(sigalgs);
1792 static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
1796 if (default_nid == -1)
1798 sig_nid = X509_get_signature_nid(x);
1800 return sig_nid == default_nid ? 1 : 0;
1801 for (i = 0; i < c->shared_sigalgslen; i++)
1802 if (sig_nid == c->shared_sigalgs[i]->sigandhash)
1807 /* Check to see if a certificate issuer name matches list of CA names */
1808 static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
1812 nm = X509_get_issuer_name(x);
1813 for (i = 0; i < sk_X509_NAME_num(names); i++) {
1814 if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
1821 * Check certificate chain is consistent with TLS extensions and is usable by
1822 * server. This servers two purposes: it allows users to check chains before
1823 * passing them to the server and it allows the server to check chains before
1824 * attempting to use them.
1827 /* Flags which need to be set for a certificate when stict mode not set */
1829 #define CERT_PKEY_VALID_FLAGS \
1830 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
1831 /* Strict mode flags */
1832 #define CERT_PKEY_STRICT_FLAGS \
1833 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
1834 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
1836 int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
1841 int check_flags = 0, strict_mode;
1842 CERT_PKEY *cpk = NULL;
1845 unsigned int suiteb_flags = tls1_suiteb(s);
1846 /* idx == -1 means checking server chains */
1848 /* idx == -2 means checking client certificate chains */
1851 idx = (int)(cpk - c->pkeys);
1853 cpk = c->pkeys + idx;
1854 pvalid = s->s3->tmp.valid_flags + idx;
1856 pk = cpk->privatekey;
1858 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
1859 /* If no cert or key, forget it */
1865 idx = ssl_cert_type(x, pk);
1868 pvalid = s->s3->tmp.valid_flags + idx;
1870 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
1871 check_flags = CERT_PKEY_STRICT_FLAGS;
1873 check_flags = CERT_PKEY_VALID_FLAGS;
1880 check_flags |= CERT_PKEY_SUITEB;
1881 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
1882 if (ok == X509_V_OK)
1883 rv |= CERT_PKEY_SUITEB;
1884 else if (!check_flags)
1889 * Check all signature algorithms are consistent with signature
1890 * algorithms extension if TLS 1.2 or later and strict mode.
1892 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
1895 if (s->s3->tmp.peer_sigalgs)
1897 /* If no sigalgs extension use defaults from RFC5246 */
1901 rsign = EVP_PKEY_RSA;
1902 default_nid = NID_sha1WithRSAEncryption;
1905 case SSL_PKEY_DSA_SIGN:
1906 rsign = EVP_PKEY_DSA;
1907 default_nid = NID_dsaWithSHA1;
1911 rsign = EVP_PKEY_EC;
1912 default_nid = NID_ecdsa_with_SHA1;
1915 case SSL_PKEY_GOST01:
1916 rsign = NID_id_GostR3410_2001;
1917 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
1920 case SSL_PKEY_GOST12_256:
1921 rsign = NID_id_GostR3410_2012_256;
1922 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
1925 case SSL_PKEY_GOST12_512:
1926 rsign = NID_id_GostR3410_2012_512;
1927 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
1936 * If peer sent no signature algorithms extension and we have set
1937 * preferred signature algorithms check we support sha1.
1939 if (default_nid > 0 && c->conf_sigalgs) {
1941 const uint16_t *p = c->conf_sigalgs;
1942 for (j = 0; j < c->conf_sigalgslen; j++, p++) {
1943 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*p);
1945 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
1948 if (j == c->conf_sigalgslen) {
1955 /* Check signature algorithm of each cert in chain */
1956 if (!tls1_check_sig_alg(c, x, default_nid)) {
1960 rv |= CERT_PKEY_EE_SIGNATURE;
1961 rv |= CERT_PKEY_CA_SIGNATURE;
1962 for (i = 0; i < sk_X509_num(chain); i++) {
1963 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
1965 rv &= ~CERT_PKEY_CA_SIGNATURE;
1972 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
1973 else if (check_flags)
1974 rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
1976 /* Check cert parameters are consistent */
1977 if (tls1_check_cert_param(s, x, 1))
1978 rv |= CERT_PKEY_EE_PARAM;
1979 else if (!check_flags)
1982 rv |= CERT_PKEY_CA_PARAM;
1983 /* In strict mode check rest of chain too */
1984 else if (strict_mode) {
1985 rv |= CERT_PKEY_CA_PARAM;
1986 for (i = 0; i < sk_X509_num(chain); i++) {
1987 X509 *ca = sk_X509_value(chain, i);
1988 if (!tls1_check_cert_param(s, ca, 0)) {
1990 rv &= ~CERT_PKEY_CA_PARAM;
1997 if (!s->server && strict_mode) {
1998 STACK_OF(X509_NAME) *ca_dn;
2000 switch (EVP_PKEY_id(pk)) {
2002 check_type = TLS_CT_RSA_SIGN;
2005 check_type = TLS_CT_DSS_SIGN;
2008 check_type = TLS_CT_ECDSA_SIGN;
2012 const unsigned char *ctypes;
2016 ctypelen = (int)c->ctype_num;
2018 ctypes = (unsigned char *)s->s3->tmp.ctype;
2019 ctypelen = s->s3->tmp.ctype_num;
2021 for (i = 0; i < ctypelen; i++) {
2022 if (ctypes[i] == check_type) {
2023 rv |= CERT_PKEY_CERT_TYPE;
2027 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
2030 rv |= CERT_PKEY_CERT_TYPE;
2032 ca_dn = s->s3->tmp.ca_names;
2034 if (!sk_X509_NAME_num(ca_dn))
2035 rv |= CERT_PKEY_ISSUER_NAME;
2037 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2038 if (ssl_check_ca_name(ca_dn, x))
2039 rv |= CERT_PKEY_ISSUER_NAME;
2041 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2042 for (i = 0; i < sk_X509_num(chain); i++) {
2043 X509 *xtmp = sk_X509_value(chain, i);
2044 if (ssl_check_ca_name(ca_dn, xtmp)) {
2045 rv |= CERT_PKEY_ISSUER_NAME;
2050 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
2053 rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
2055 if (!check_flags || (rv & check_flags) == check_flags)
2056 rv |= CERT_PKEY_VALID;
2060 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2061 rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2063 rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
2066 * When checking a CERT_PKEY structure all flags are irrelevant if the
2070 if (rv & CERT_PKEY_VALID) {
2073 /* Preserve sign and explicit sign flag, clear rest */
2074 *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
2081 /* Set validity of certificates in an SSL structure */
2082 void tls1_set_cert_validity(SSL *s)
2084 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
2085 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
2086 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
2087 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2088 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2089 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
2092 /* User level utiity function to check a chain is suitable */
2093 int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
2095 return tls1_check_chain(s, x, pk, chain, -1);
2098 #ifndef OPENSSL_NO_DH
2099 DH *ssl_get_auto_dh(SSL *s)
2101 int dh_secbits = 80;
2102 if (s->cert->dh_tmp_auto == 2)
2103 return DH_get_1024_160();
2104 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
2105 if (s->s3->tmp.new_cipher->strength_bits == 256)
2110 if (s->s3->tmp.cert == NULL)
2112 dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
2115 if (dh_secbits >= 128) {
2123 if (dh_secbits >= 192)
2124 p = BN_get_rfc3526_prime_8192(NULL);
2126 p = BN_get_rfc3526_prime_3072(NULL);
2127 if (p == NULL || g == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
2135 if (dh_secbits >= 112)
2136 return DH_get_2048_224();
2137 return DH_get_1024_160();
2141 static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2144 EVP_PKEY *pkey = X509_get0_pubkey(x);
2147 * If no parameters this will return -1 and fail using the default
2148 * security callback for any non-zero security level. This will
2149 * reject keys which omit parameters but this only affects DSA and
2150 * omission of parameters is never (?) done in practice.
2152 secbits = EVP_PKEY_security_bits(pkey);
2155 return ssl_security(s, op, secbits, 0, x);
2157 return ssl_ctx_security(ctx, op, secbits, 0, x);
2160 static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
2162 /* Lookup signature algorithm digest */
2163 int secbits = -1, md_nid = NID_undef, sig_nid;
2164 /* Don't check signature if self signed */
2165 if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2167 sig_nid = X509_get_signature_nid(x);
2168 if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL)) {
2170 if (md_nid && (md = EVP_get_digestbynid(md_nid)))
2171 secbits = EVP_MD_size(md) * 4;
2174 return ssl_security(s, op, secbits, md_nid, x);
2176 return ssl_ctx_security(ctx, op, secbits, md_nid, x);
2179 int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
2182 vfy = SSL_SECOP_PEER;
2184 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2185 return SSL_R_EE_KEY_TOO_SMALL;
2187 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2188 return SSL_R_CA_KEY_TOO_SMALL;
2190 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2191 return SSL_R_CA_MD_TOO_WEAK;
2196 * Check security of a chain, if sk includes the end entity certificate then
2197 * x is NULL. If vfy is 1 then we are verifying a peer chain and not sending
2198 * one to the peer. Return values: 1 if ok otherwise error code to use
2201 int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
2203 int rv, start_idx, i;
2205 x = sk_X509_value(sk, 0);
2210 rv = ssl_security_cert(s, NULL, x, vfy, 1);
2214 for (i = start_idx; i < sk_X509_num(sk); i++) {
2215 x = sk_X509_value(sk, i);
2216 rv = ssl_security_cert(s, NULL, x, vfy, 0);
2224 * Choose an appropriate signature algorithm based on available certificates
2225 * Sets chosen certificate and signature algorithm.
2227 * For servers if we fail to find a required certificate it is a fatal error
2228 * and an appropriate error code is set and the TLS alert set in *al.
2230 * For clients al is set to NULL. If a certificate is not suitable it is not
2231 * a fatal error: we will either try another certificate or not present one
2232 * to the server. In this case no error is set.
2234 int tls_choose_sigalg(SSL *s, int *al)
2237 const SIGALG_LOOKUP *lu = NULL;
2239 s->s3->tmp.cert = NULL;
2240 s->s3->tmp.sigalg = NULL;
2242 if (SSL_IS_TLS13(s)) {
2244 #ifndef OPENSSL_NO_EC
2248 /* Look for a certificate matching shared sigaglgs */
2249 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
2250 lu = s->cert->shared_sigalgs[i];
2252 /* Skip DSA and RSA if not PSS */
2253 if (lu->sig == EVP_PKEY_DSA || lu->sig == EVP_PKEY_RSA)
2255 if (ssl_md(lu->hash_idx) == NULL)
2258 if (!ssl_has_cert(s, idx))
2260 if (lu->sig == EVP_PKEY_EC) {
2261 #ifndef OPENSSL_NO_EC
2263 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[idx].privatekey);
2265 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2267 if (lu->curve != NID_undef && curve != lu->curve)
2275 if (i == s->cert->shared_sigalgslen) {
2278 *al = SSL_AD_HANDSHAKE_FAILURE;
2279 SSLerr(SSL_F_TLS_CHOOSE_SIGALG,
2280 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2285 /* Find index corresponding to ciphersuite */
2286 idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
2287 /* If no certificate for ciphersuite return */
2290 if (idx == SSL_PKEY_GOST_EC) {
2291 /* Work out which GOST certificate is avaiable */
2292 if (ssl_has_cert(s, SSL_PKEY_GOST12_512)) {
2293 idx = SSL_PKEY_GOST12_512;
2294 } else if (ssl_has_cert(s, SSL_PKEY_GOST12_256)) {
2295 idx = SSL_PKEY_GOST12_256;
2296 } else if (ssl_has_cert(s, SSL_PKEY_GOST01)) {
2297 idx = SSL_PKEY_GOST01;
2301 *al = SSL_AD_INTERNAL_ERROR;
2302 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2305 } else if (!ssl_has_cert(s, idx)) {
2308 *al = SSL_AD_INTERNAL_ERROR;
2309 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2313 /* Find index for client certificate */
2314 idx = s->cert->key - s->cert->pkeys;
2315 if (!ssl_has_cert(s, idx))
2319 if (SSL_USE_SIGALGS(s)) {
2320 if (s->s3->tmp.peer_sigalgs != NULL) {
2324 * Find highest preference signature algorithm matching
2327 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
2328 lu = s->cert->shared_sigalgs[i];
2329 if (lu->sig_idx == idx)
2331 if (idx == SSL_PKEY_RSA && lu->sig == EVP_PKEY_RSA_PSS)
2334 if (i == s->cert->shared_sigalgslen) {
2337 *al = SSL_AD_INTERNAL_ERROR;
2338 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2343 * If we have no sigalg use defaults
2345 const uint16_t *sent_sigs;
2346 size_t sent_sigslen, i;
2348 if ((lu = tls1_get_legacy_sigalg(s, idx)) == NULL) {
2351 *al = SSL_AD_INTERNAL_ERROR;
2352 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2356 /* Check signature matches a type we sent */
2357 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
2358 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
2359 if (lu->sigalg == *sent_sigs)
2362 if (i == sent_sigslen) {
2365 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
2366 *al = SSL_AD_HANDSHAKE_FAILURE;
2371 if ((lu = tls1_get_legacy_sigalg(s, idx)) == NULL) {
2374 *al = SSL_AD_INTERNAL_ERROR;
2375 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2382 *al = SSL_AD_INTERNAL_ERROR;
2383 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2387 s->s3->tmp.cert = &s->cert->pkeys[idx];
2388 s->cert->key = s->s3->tmp.cert;
2389 s->s3->tmp.sigalg = lu;