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eapol: Use handshake_util_find_kde

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This returns the length of the actual contents, making the code a bit
easier to read and avoid the need to mask the KDE value which isn't
self-explanatory.
This commit is contained in:
Denis Kenzior 2021-07-15 16:12:21 -05:00
parent f7b59750d0
commit 46c19b6c6a
1 changed files with 17 additions and 15 deletions
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32
src/eapol.c
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@ -1498,13 +1498,14 @@ static void eapol_handle_ptk_2_of_4(struct eapol_sm *sm,
}
if (sm->handshake->support_ip_allocation) {
size_t len;
const uint8_t *ip_req_kde =
eapol_find_wfa_kde(EAPOL_KEY_DATA(ek, sm->mic_len),
handshake_util_find_kde(HANDSHAKE_KDE_IP_ADDRESS_REQ,
EAPOL_KEY_DATA(ek, sm->mic_len),
EAPOL_KEY_DATA_LEN(ek, sm->mic_len),
HANDSHAKE_KDE_IP_ADDRESS_REQ & 255);
&len);
if (ip_req_kde &&
(ip_req_kde[1] < 5 || ip_req_kde[6] != 0x01)) {
if (ip_req_kde && (len < 1 || ip_req_kde[0] != 0x01)) {
l_debug("Invalid IP Address Request KDE in frame 2/4");
handshake_failed(sm, MMPDU_REASON_CODE_INVALID_IE);
return;
@ -1788,16 +1789,17 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
igtk = NULL;
if (hs->support_ip_allocation) {
size_t len;
const uint8_t *ip_alloc_kde =
eapol_find_wfa_kde(decrypted_key_data,
decrypted_key_data_size,
HANDSHAKE_KDE_IP_ADDRESS_ALLOC & 255);
handshake_util_find_kde(HANDSHAKE_KDE_IP_ADDRESS_ALLOC,
decrypted_key_data,
decrypted_key_data_size,
&len);
if (ip_alloc_kde &&
(ip_alloc_kde[1] < 16 ||
!eapol_check_ip_mask(ip_alloc_kde + 10,
ip_alloc_kde + 6,
ip_alloc_kde + 14))) {
if (ip_alloc_kde && (len < 12 ||
!eapol_check_ip_mask(ip_alloc_kde + 4,
ip_alloc_kde,
ip_alloc_kde + 8))) {
l_debug("Invalid IP Allocation KDE in frame 3/4");
handshake_failed(sm, MMPDU_REASON_CODE_INVALID_IE);
return;
@ -1806,9 +1808,9 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
hs->support_ip_allocation = ip_alloc_kde != NULL;
if (ip_alloc_kde) {
hs->client_ip_addr = l_get_be32(ip_alloc_kde + 6);
hs->subnet_mask = l_get_be32(ip_alloc_kde + 10);
hs->go_ip_addr = l_get_be32(ip_alloc_kde + 14);
hs->client_ip_addr = l_get_be32(ip_alloc_kde);
hs->subnet_mask = l_get_be32(ip_alloc_kde + 4);
hs->go_ip_addr = l_get_be32(ip_alloc_kde + 8);
} else
l_debug("Authenticator ignored our IP Address Request");
}