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Use separate functions for supported and peer groups lists 

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4475)
This commit is contained in:
Dr. Stephen Henson 2017-09-26 15:28:16 +01:00
parent f0b843c1f4
commit ff6d20a67b
5 changed files with 43 additions and 45 deletions
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11
ssl/ssl_locl.h
View File

@ -2085,6 +2085,13 @@ static ossl_inline int ssl_has_cert(const SSL *s, int idx)
&& s->cert->pkeys[idx].privatekey != NULL; && s->cert->pkeys[idx].privatekey != NULL;
} }
static ossl_inline void tls1_get_peer_groups(SSL *s, const uint16_t **pgroups,
size_t *pgroupslen)
{
*pgroups = s->session->ext.supportedgroups;
*pgroupslen = s->session->ext.supportedgroups_len;
}
# ifndef OPENSSL_UNIT_TEST # ifndef OPENSSL_UNIT_TEST
__owur int ssl_read_internal(SSL *s, void *buf, size_t num, size_t *readbytes); __owur int ssl_read_internal(SSL *s, void *buf, size_t num, size_t *readbytes);
@ -2354,8 +2361,8 @@ __owur EVP_PKEY *ssl_generate_param_group(uint16_t id);
# endif /* OPENSSL_NO_EC */ # endif /* OPENSSL_NO_EC */
__owur int tls_curve_allowed(SSL *s, uint16_t curve, int op); __owur int tls_curve_allowed(SSL *s, uint16_t curve, int op);
void tls1_get_grouplist(SSL *s, int sess, const uint16_t **pcurves, void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
size_t *num_curves); size_t *pgroupslen);
__owur int tls1_set_server_sigalgs(SSL *s); __owur int tls1_set_server_sigalgs(SSL *s);

4
ssl/statem/extensions.c
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@ -1174,8 +1174,8 @@ static int final_key_share(SSL *s, unsigned int context, int sent, int *al)
/* Check if a shared group exists */ /* Check if a shared group exists */
/* Get the clients list of supported groups. */ /* Get the clients list of supported groups. */
tls1_get_grouplist(s, 1, &clntcurves, &clnt_num_curves); tls1_get_peer_groups(s, &clntcurves, &clnt_num_curves);
tls1_get_grouplist(s, 0, &pcurves, &num_curves); tls1_get_supported_groups(s, &pcurves, &num_curves);
/* Find the first group we allow that is also in client's list */ /* Find the first group we allow that is also in client's list */
for (i = 0; i < num_curves; i++) { for (i = 0; i < num_curves; i++) {

6
ssl/statem/extensions_clnt.c
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@ -149,7 +149,7 @@ EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
* Add TLS extension supported_groups to the ClientHello message * Add TLS extension supported_groups to the ClientHello message
*/ */
/* TODO(TLS1.3): Add support for DHE groups */ /* TODO(TLS1.3): Add support for DHE groups */
tls1_get_grouplist(s, 0, &pcurves, &num_curves); tls1_get_supported_groups(s, &pcurves, &num_curves);
if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups) if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups)
/* Sub-packet for supported_groups extension */ /* Sub-packet for supported_groups extension */
@ -604,7 +604,7 @@ EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
return EXT_RETURN_FAIL; return EXT_RETURN_FAIL;
} }
tls1_get_grouplist(s, 0, &pcurves, &num_curves); tls1_get_supported_groups(s, &pcurves, &num_curves);
/* /*
* TODO(TLS1.3): Make the number of key_shares sent configurable. For * TODO(TLS1.3): Make the number of key_shares sent configurable. For
@ -1534,7 +1534,7 @@ int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
} }
/* Validate the selected group is one we support */ /* Validate the selected group is one we support */
tls1_get_grouplist(s, 0, &pcurves, &num_curves); tls1_get_supported_groups(s, &pcurves, &num_curves);
for (i = 0; i < num_curves; i++) { for (i = 0; i < num_curves; i++) {
if (group_id == pcurves[i]) if (group_id == pcurves[i])
break; break;

6
ssl/statem/extensions_srvr.c
View File

@ -520,9 +520,9 @@ int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
} }
/* Get our list of supported curves */ /* Get our list of supported curves */
tls1_get_grouplist(s, 0, &srvrcurves, &srvr_num_curves); tls1_get_supported_groups(s, &srvrcurves, &srvr_num_curves);
/* Get the clients list of supported curves. */ /* Get the clients list of supported curves. */
tls1_get_grouplist(s, 1, &clntcurves, &clnt_num_curves); tls1_get_peer_groups(s, &clntcurves, &clnt_num_curves);
if (clnt_num_curves == 0) { if (clnt_num_curves == 0) {
/* /*
* This can only happen if the supported_groups extension was not sent, * This can only happen if the supported_groups extension was not sent,
@ -885,7 +885,7 @@ EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
return EXT_RETURN_NOT_SENT; return EXT_RETURN_NOT_SENT;
/* Get our list of supported groups */ /* Get our list of supported groups */
tls1_get_grouplist(s, 0, &groups, &numgroups); tls1_get_supported_groups(s, &groups, &numgroups);
if (numgroups == 0) { if (numgroups == 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR); SSLerr(SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR);
return EXT_RETURN_FAIL; return EXT_RETURN_FAIL;

61
ssl/t1_lib.c
View File

@ -205,47 +205,37 @@ static uint16_t tls1_nid2group_id(int nid)
} }
/* /*
* Get curves list, if "sess" is set return client curves otherwise * Set *pgroups to the supported groups list and *pgroupslen to
* preferred list. * the number of groups supported.
* Sets |num_curves| to the number of curves in the list, i.e.,
* the length of |pcurves| is num_curves.
* Returns 1 on success and 0 if the client curves list has invalid format.
* The latter indicates an internal error: we should not be accepting such
* lists in the first place.
*/ */
void tls1_get_grouplist(SSL *s, int sess, const uint16_t **pcurves, void tls1_get_supported_groups(SSL *s, const uint16_t **pgroups,
size_t *pcurveslen) size_t *pgroupslen)
{ {
if (sess) {
*pcurves = s->session->ext.supportedgroups;
*pcurveslen = s->session->ext.supportedgroups_len;
return;
}
/* For Suite B mode only include P-256, P-384 */ /* For Suite B mode only include P-256, P-384 */
switch (tls1_suiteb(s)) { switch (tls1_suiteb(s)) {
case SSL_CERT_FLAG_SUITEB_128_LOS: case SSL_CERT_FLAG_SUITEB_128_LOS:
*pcurves = suiteb_curves; *pgroups = suiteb_curves;
*pcurveslen = OSSL_NELEM(suiteb_curves); *pgroupslen = OSSL_NELEM(suiteb_curves);
break; break;
case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY: case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
*pcurves = suiteb_curves; *pgroups = suiteb_curves;
*pcurveslen = 1; *pgroupslen = 1;
break; break;
case SSL_CERT_FLAG_SUITEB_192_LOS: case SSL_CERT_FLAG_SUITEB_192_LOS:
*pcurves = suiteb_curves + 1; *pgroups = suiteb_curves + 1;
*pcurveslen = 1; *pgroupslen = 1;
break; break;
default: default:
if (s->ext.supportedgroups == NULL) { if (s->ext.supportedgroups == NULL) {
*pcurves = eccurves_default; *pgroups = eccurves_default;
*pcurveslen = OSSL_NELEM(eccurves_default); *pgroupslen = OSSL_NELEM(eccurves_default);
} else { } else {
*pcurves = s->ext.supportedgroups; *pgroups = s->ext.supportedgroups;
*pcurveslen = s->ext.supportedgroups_len; *pgroupslen = s->ext.supportedgroups_len;
} }
break; break;
} }
@ -300,7 +290,7 @@ int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
} else /* Should never happen */ } else /* Should never happen */
return 0; return 0;
} }
tls1_get_grouplist(s, 0, &curves, &num_curves); tls1_get_supported_groups(s, &curves, &num_curves);
if (!tls1_in_list(curve_id, curves, num_curves)) if (!tls1_in_list(curve_id, curves, num_curves))
return 0; return 0;
return tls_curve_allowed(s, curve_id, SSL_SECOP_CURVE_CHECK); return tls_curve_allowed(s, curve_id, SSL_SECOP_CURVE_CHECK);
@ -341,15 +331,16 @@ uint16_t tls1_shared_group(SSL *s, int nmatch)
nmatch = 0; nmatch = 0;
} }
/* /*
* Avoid truncation. tls1_get_grouplist takes an int * If server preference set, our groups are the preference order
* but s->options is a long... * otherwise peer decides.
*/ */
tls1_get_grouplist(s, if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0, tls1_get_supported_groups(s, &pref, &num_pref);
&supp, &num_supp); tls1_get_peer_groups(s, &supp, &num_supp);
tls1_get_grouplist(s, } else {
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0, tls1_get_peer_groups(s, &pref, &num_pref);
&pref, &num_pref); tls1_get_supported_groups(s, &supp, &num_supp);
}
for (k = 0, i = 0; i < num_pref; i++) { for (k = 0, i = 0; i < num_pref; i++) {
uint16_t id = pref[i]; uint16_t id = pref[i];
@ -514,7 +505,7 @@ static int tls1_check_group_id(SSL *s, uint16_t group_id)
return 0; return 0;
/* Check group is one of our preferences */ /* Check group is one of our preferences */
tls1_get_grouplist(s, 0, &groups, &groups_len); tls1_get_supported_groups(s, &groups, &groups_len);
if (!tls1_in_list(group_id, groups, groups_len)) if (!tls1_in_list(group_id, groups, groups_len))
return 0; return 0;
@ -523,7 +514,7 @@ static int tls1_check_group_id(SSL *s, uint16_t group_id)
return 1; return 1;
/* Check group is one of peers preferences */ /* Check group is one of peers preferences */
tls1_get_grouplist(s, 1, &groups, &groups_len); tls1_get_peer_groups(s, &groups, &groups_len);
/* /*
* RFC 4492 does not require the supported elliptic curves extension * RFC 4492 does not require the supported elliptic curves extension