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SAE: Reject unsuitable groups based on REVmd changes

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The rules defining which DH groups are suitable for SAE use were
accepted into IEEE 802.11 REVmd based on this document:
https://mentor.ieee.org/802.11/dcn/19/11-19-0387-02-000m-addressing-some-sae-comments.docx

Enforce those rules in production builds of wpa_supplicant and hostapd.
CONFIG_TESTING_OPTIONS=y builds can still be used to select any o the
implemented groups to maintain testing coverage.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-04-08 18:01:07 +03:00 committed by Jouni Malinen
parent 8e607b1b62
commit db54db11ae
1 changed files with 23 additions and 0 deletions
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23
src/common/sae.c
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@ -17,10 +17,33 @@
#include "sae.h" #include "sae.h"
static int sae_suitable_group(int group)
{
#ifdef CONFIG_TESTING_OPTIONS
/* Allow all groups for testing purposes in non-production builds. */
return 1;
#else /* CONFIG_TESTING_OPTIONS */
/* Enforce REVmd rules on which SAE groups are suitable for production
* purposes: FFC groups whose prime is >= 3072 bits and ECC groups
* defined over a prime field whose prime is >= 256 bits. Furthermore,
* ECC groups defined over a characteristic 2 finite field and ECC
* groups with a co-factor greater than 1 are not suitable. */
return group == 19 || group == 20 || group == 21 ||
group == 28 || group == 29 || group == 30 ||
group == 15 || group == 16 || group == 17 || group == 18;
#endif /* CONFIG_TESTING_OPTIONS */
}
int sae_set_group(struct sae_data *sae, int group) int sae_set_group(struct sae_data *sae, int group)
{ {
struct sae_temporary_data *tmp; struct sae_temporary_data *tmp;
if (!sae_suitable_group(group)) {
wpa_printf(MSG_DEBUG, "SAE: Reject unsuitable group %d", group);
return -1;
}
sae_clear_data(sae); sae_clear_data(sae);
tmp = sae->tmp = os_zalloc(sizeof(*tmp)); tmp = sae->tmp = os_zalloc(sizeof(*tmp));
if (tmp == NULL) if (tmp == NULL)