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DPP2: Detect PFS downgrade attack while processing EAPOL-Key msg 2/4

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Do not allow association to continue if the local configuration enables
PFS and the station indicates it supports PFS, but PFS was not
negotiated for the association.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-05-01 20:02:48 +03:00 committed by Jouni Malinen
parent 68422fedbf
commit 9561925b4d
1 changed files with 18 additions and 0 deletions
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18
src/ap/wpa_auth.c
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@ -3079,6 +3079,24 @@ SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
}
#endif /* CONFIG_P2P */
#ifdef CONFIG_DPP2
if (kde.dpp_kde) {
wpa_printf(MSG_DEBUG,
"DPP: peer Protocol Version %u Flags 0x%x",
kde.dpp_kde[0], kde.dpp_kde[1]);
if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP &&
wpa_auth->conf.dpp_pfs != 2 &&
(kde.dpp_kde[1] & DPP_KDE_PFS_ALLOWED) &&
!sm->dpp_z) {
wpa_printf(MSG_INFO,
"DPP: Peer indicated it supports PFS and local configuration allows this, but PFS was not negotiated for the association");
wpa_sta_disconnect(wpa_auth, sm->addr,
WLAN_REASON_PREV_AUTH_NOT_VALID);
return;
}
}
#endif /* CONFIG_DPP2 */
#ifdef CONFIG_IEEE80211R_AP
if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
/*