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FT: Derive PTK properly for rekeying with FT protocol

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Do not try to derive a PMK-R0 and PMK-R1 again for the case where an
association was started with FT protocol and PTK is rekeyed using 4-way
handshake. Instead, use the previously derived PMK-R1 to allow a new PTK
to be derived.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-04-18 18:17:07 +03:00 committed by Jouni Malinen
parent fb1dee221b
commit b583ed38df
1 changed files with 13 additions and 1 deletions
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14
src/ap/wpa_auth.c
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@ -2211,8 +2211,20 @@ static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
size_t z_len = 0;
#ifdef CONFIG_IEEE80211R_AP
if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
if (sm->ft_completed) {
u8 ptk_name[WPA_PMK_NAME_LEN];
return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len,
sm->SNonce, sm->ANonce,
sm->addr, sm->wpa_auth->addr,
sm->pmk_r1_name,
ptk, ptk_name,
sm->wpa_key_mgmt,
sm->pairwise);
}
return wpa_auth_derive_ptk_ft(sm, ptk);
}
#endif /* CONFIG_IEEE80211R_AP */
#ifdef CONFIG_DPP2