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SAE: Enable only groups 19, 20, and 21 in station mode

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Remove groups 25 (192-bit Random ECP Group) and 26 (224-bit Random ECP
Group) from the default SAE groups in station mode since those groups
are not as strong as the mandatory group 19 (NIST P-256).

In addition, add a warning about MODP groups 1, 2, 5, 22, 23, and 24
based on "MUST NOT" or "SHOULD NOT" categorization in RFC 8247. All the
MODP groups were already disabled by default and would have needed
explicit configuration to be allowed.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-03-05 17:23:58 +02:00 committed by Jouni Malinen
parent 941bad5ef4
commit a9fe13035e
2 changed files with 11 additions and 6 deletions
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4
wpa_supplicant/sme.c
View file

@ -57,7 +57,7 @@ static int index_within_array(const int *array, int idx)
static int sme_set_sae_group(struct wpa_supplicant *wpa_s)
{
int *groups = wpa_s->conf->sae_groups;
int default_groups[] = { 19, 20, 21, 25, 26, 0 };
int default_groups[] = { 19, 20, 21, 0 };
if (!groups || groups[0] <= 0)
groups = default_groups;
@ -1037,7 +1037,7 @@ static int sme_sae_auth(struct wpa_supplicant *wpa_s, u16 auth_transaction,
status_code == WLAN_STATUS_ANTI_CLOGGING_TOKEN_REQ &&
wpa_s->sme.sae.state == SAE_COMMITTED &&
(external || wpa_s->current_bss) && wpa_s->current_ssid) {
int default_groups[] = { 19, 20, 21, 25, 26, 0 };
int default_groups[] = { 19, 20, 21, 0 };
u16 group;
groups = wpa_s->conf->sae_groups;

13
wpa_supplicant/wpa_supplicant.conf
View file

@ -377,11 +377,16 @@ fast_reauth=1
# Enabled SAE finite cyclic groups in preference order
# By default (if this parameter is not set), the mandatory group 19 (ECC group
# defined over a 256-bit prime order field) is preferred, but other groups are
# also enabled. If this parameter is set, the groups will be tried in the
# indicated order. The group values are listed in the IANA registry:
# defined over a 256-bit prime order field, NIST P-256) is preferred and groups
# 20 (NIST P-384) and 21 (NIST P-521) are also enabled. If this parameter is
# set, the groups will be tried in the indicated order.
# The group values are listed in the IANA registry:
# http://www.iana.org/assignments/ipsec-registry/ipsec-registry.xml#ipsec-registry-9
#sae_groups=21 20 19 26 25
# Note that groups 1, 2, 5, 22, 23, and 24 should not be used in production
# purposes due limited security (see RFC 8247). Groups that are not as strong as
# group 19 (ECC, NIST P-256) are unlikely to be useful for production use cases
# since all implementations are required to support group 19.
#sae_groups=19 20 21
# Default value for DTIM period (if not overridden in network block)
#dtim_period=2