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FILS: Move Key Confirm element validation to a helper function

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This can be reused from driver-based AP SME callback.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jeffin Mammen 2017-04-21 18:42:00 +03:00 committed by Jouni Malinen
parent 087631b985
commit bd59935323
2 changed files with 42 additions and 26 deletions
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66
src/ap/wpa_auth.c
View file

@ -2215,13 +2215,50 @@ const u8 * wpa_fils_validate_fils_session(struct wpa_state_machine *sm,
}
int wpa_fils_validate_key_confirm(struct wpa_state_machine *sm, const u8 *ies,
size_t ies_len)
{
struct ieee802_11_elems elems;
if (ieee802_11_parse_elems(ies, ies_len, &elems, 1) == ParseFailed) {
wpa_printf(MSG_DEBUG,
"FILS: Failed to parse decrypted elements");
return -1;
}
if (!elems.fils_key_confirm) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
return -1;
}
if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
wpa_printf(MSG_DEBUG,
"FILS: Unexpected Key-Auth length %d (expected %d)",
elems.fils_key_confirm_len,
(int) sm->fils_key_auth_len);
return -1;
}
if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
sm->fils_key_auth_len) != 0) {
wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
elems.fils_key_confirm, elems.fils_key_confirm_len);
wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
sm->fils_key_auth_sta, sm->fils_key_auth_len);
return -1;
}
return 0;
}
int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
const struct ieee80211_mgmt *mgmt, size_t frame_len,
u8 *pos, size_t left)
{
u16 fc, stype;
const u8 *end, *ie_start, *ie, *session, *crypt;
struct ieee802_11_elems elems;
const u8 *aad[5];
size_t aad_len[5];
@ -2295,31 +2332,8 @@ int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
pos, left - AES_BLOCK_SIZE);
if (ieee802_11_parse_elems(pos, left - AES_BLOCK_SIZE, &elems, 1) ==
ParseFailed) {
wpa_printf(MSG_DEBUG,
"FILS: Failed to parse decrypted elements");
return -1;
}
if (!elems.fils_key_confirm) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
return -1;
}
if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
wpa_printf(MSG_DEBUG,
"FILS: Unexpected Key-Auth length %d (expected %d)",
elems.fils_key_confirm_len,
(int) sm->fils_key_auth_len);
return -1;
}
if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
sm->fils_key_auth_len) != 0) {
wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
elems.fils_key_confirm,
elems.fils_key_confirm_len);
wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
sm->fils_key_auth_sta, sm->fils_key_auth_len);
if (wpa_fils_validate_key_confirm(sm, pos, left - AES_BLOCK_SIZE) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Key Confirm validation failed");
return -1;
}

2
src/ap/wpa_auth.h
View file

@ -377,6 +377,8 @@ int fils_set_tk(struct wpa_state_machine *sm);
const u8 * wpa_fils_validate_fils_session(struct wpa_state_machine *sm,
const u8 *ies, size_t ies_len,
const u8 *fils_session);
int wpa_fils_validate_key_confirm(struct wpa_state_machine *sm, const u8 *ies,
size_t ies_len);
int wpa_auth_write_fte(struct wpa_authenticator *wpa_auth, u8 *buf, size_t len);
void wpa_auth_get_fils_aead_params(struct wpa_state_machine *sm,