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e289a4133c
Fixes this security problem:
* SAE/EAP-pwd side-channel attack update
https://w1.fi/security/2019-6/sae-eap-pwd-side-channel-attack-update.txt
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 7bed9bf10f)
55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
From db54db11aec763b6fc74715c36e0f9de0d65e206 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@codeaurora.org>
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Date: Mon, 8 Apr 2019 18:01:07 +0300
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Subject: SAE: Reject unsuitable groups based on REVmd changes
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The rules defining which DH groups are suitable for SAE use were
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accepted into IEEE 802.11 REVmd based on this document:
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https://mentor.ieee.org/802.11/dcn/19/11-19-0387-02-000m-addressing-some-sae-comments.docx
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Enforce those rules in production builds of wpa_supplicant and hostapd.
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CONFIG_TESTING_OPTIONS=y builds can still be used to select any o the
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implemented groups to maintain testing coverage.
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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
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---
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src/common/sae.c | 23 +++++++++++++++++++++++
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1 file changed, 23 insertions(+)
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--- a/src/common/sae.c
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+++ b/src/common/sae.c
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@@ -18,10 +18,33 @@
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#include "sae.h"
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+static int sae_suitable_group(int group)
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+{
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+#ifdef CONFIG_TESTING_OPTIONS
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+ /* Allow all groups for testing purposes in non-production builds. */
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+ return 1;
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+#else /* CONFIG_TESTING_OPTIONS */
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+ /* Enforce REVmd rules on which SAE groups are suitable for production
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+ * purposes: FFC groups whose prime is >= 3072 bits and ECC groups
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+ * defined over a prime field whose prime is >= 256 bits. Furthermore,
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+ * ECC groups defined over a characteristic 2 finite field and ECC
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+ * groups with a co-factor greater than 1 are not suitable. */
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+ return group == 19 || group == 20 || group == 21 ||
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+ group == 28 || group == 29 || group == 30 ||
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+ group == 15 || group == 16 || group == 17 || group == 18;
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+#endif /* CONFIG_TESTING_OPTIONS */
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+}
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+
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+
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int sae_set_group(struct sae_data *sae, int group)
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{
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struct sae_temporary_data *tmp;
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+ if (!sae_suitable_group(group)) {
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+ wpa_printf(MSG_DEBUG, "SAE: Reject unsuitable group %d", group);
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+ return -1;
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+ }
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+
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sae_clear_data(sae);
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tmp = sae->tmp = os_zalloc(sizeof(*tmp));
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if (tmp == NULL)
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