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SAE: Fix FT-SAE key derivation for a case where PMKID in msg 1/4 matches

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Previously, matching PMKSA cache entry ended up clearing XXKey. However,
that XXKey is needed in the specific case where FT-SAE goes through the
initial mobility domain association with SAE authentication. FT-SAE
worked previously since the hostapd side generation of the particular
PMKID value in msg 1/4 was broken, but once that PMKID is fixed,
wpa_supplicant will need this fix to allow FT-SAE to be used.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2018-03-23 18:42:21 +02:00 committed by Jouni Malinen
parent 0fa669bcae
commit a03f9d17ea
1 changed files with 12 additions and 0 deletions
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12
src/rsn_supp/wpa.c
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@ -288,6 +288,18 @@ static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
eapol_sm_notify_cached(sm->eapol); eapol_sm_notify_cached(sm->eapol);
#ifdef CONFIG_IEEE80211R #ifdef CONFIG_IEEE80211R
sm->xxkey_len = 0; sm->xxkey_len = 0;
#ifdef CONFIG_SAE
if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE &&
sm->pmk_len == PMK_LEN) {
/* Need to allow FT key derivation to proceed with
* PMK from SAE being used as the XXKey in cases where
* the PMKID in msg 1/4 matches the PMKSA entry that was
* just added based on SAE authentication for the
* initial mobility domain association. */
os_memcpy(sm->xxkey, sm->pmk, sm->pmk_len);
sm->xxkey_len = sm->pmk_len;
}
#endif /* CONFIG_SAE */
#endif /* CONFIG_IEEE80211R */ #endif /* CONFIG_IEEE80211R */
} else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) { } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
int res, pmk_len; int res, pmk_len;