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FT: Support 256-bit IGTK in AP case

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hostapd was hardcoded to use 128-bit IGTK in FT protocol (IGTK
subelement in FTE). Extend that to allow 256-bit IGTK (i.e.,
BIP-CMAC-256 and BIP-GMAC-256) to be used as well.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2018-06-05 21:36:56 +03:00
parent 2842987879
commit ff168f8c23
1 changed files with 6 additions and 3 deletions
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9
src/ap/wpa_auth_ft.c
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@ -2173,6 +2173,7 @@ static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
size_t subelem_len;
const u8 *kek;
size_t kek_len;
size_t igtk_len;
if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
kek = sm->PTK.kek2;
@ -2182,9 +2183,11 @@ static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
kek_len = sm->PTK.kek_len;
}
igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
/* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
* Key[16+8] */
subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
subelem_len = 1 + 1 + 2 + 6 + 1 + igtk_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
@ -2196,8 +2199,8 @@ static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
pos += 2;
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
pos += 6;
*pos++ = WPA_IGTK_LEN;
if (aes_wrap(kek, kek_len, WPA_IGTK_LEN / 8,
*pos++ = igtk_len;
if (aes_wrap(kek, kek_len, igtk_len / 8,
gsm->IGTK[gsm->GN_igtk - 4], pos)) {
wpa_printf(MSG_DEBUG,
"FT: IGTK subelem encryption failed: kek_len=%d",