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Fix TK configuration to the driver in EAPOL-Key 3/4 retry case

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Commit 7d711541dc ('Clear TK part of PTK
after driver key configuration') started clearing TK from memory
immediately after having configured it to the driver when processing
EAPOL-Key message 3/4. While this covered the most common case, it did
not take into account the possibility of the authenticator having to
retry EAPOL-Key message 3/4 in case the first EAPOL-Key message 4/4
response is lost. That case ended up trying to reinstall the same TK to
the driver, but the key was not available anymore.

Fix the EAPOL-Key message 3/4 retry case by configuring TK to the driver
only once. There was no need to try to set the same key after each
EAPOL-Key message 3/4 since TK could not change. If actual PTK rekeying
is used, the new TK will be configured once when processing the new
EAPOL-Key message 3/4 for the first time.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2015-10-01 18:51:04 +03:00 committed by Jouni Malinen
parent 60bfe7061d
commit ad00d64e7d
2 changed files with 9 additions and 0 deletions
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8
src/rsn_supp/wpa.c
View File

@ -500,6 +500,7 @@ static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
os_memset(buf, 0, sizeof(buf));
}
sm->tptk_set = 1;
sm->tk_to_set = 1;
kde = sm->assoc_wpa_ie;
kde_len = sm->assoc_wpa_ie_len;
@ -605,6 +606,12 @@ static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
const u8 *key_rsc;
u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
if (!sm->tk_to_set) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Do not re-install same PTK to the driver");
return 0;
}
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Installing PTK to the driver");
@ -643,6 +650,7 @@ static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
/* TK is not needed anymore in supplicant */
os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
sm->tk_to_set = 0;
if (sm->wpa_ptk_rekey) {
eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);

1
src/rsn_supp/wpa_i.h
View File

@ -24,6 +24,7 @@ struct wpa_sm {
struct wpa_ptk ptk, tptk;
int ptk_set, tptk_set;
unsigned int msg_3_of_4_ok:1;
unsigned int tk_to_set:1;
u8 snonce[WPA_NONCE_LEN];
u8 anonce[WPA_NONCE_LEN]; /* ANonce from the last 1/4 msg */
int renew_snonce;