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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/wpa_supplicant/stuff/rebased-v2.6-0004-Prevent-installation-of-an-all-zero-TK.patch	Tue Mar 22 10:57:54 2022 +0100
     1.3 @@ -0,0 +1,79 @@
     1.4 +From 8f82bc94e8697a9d47fa8774dfdaaede1084912c Mon Sep 17 00:00:00 2001
     1.5 +From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
     1.6 +Date: Fri, 29 Sep 2017 04:22:51 +0200
     1.7 +Subject: [PATCH 4/8] Prevent installation of an all-zero TK
     1.8 +
     1.9 +Properly track whether a PTK has already been installed to the driver
    1.10 +and the TK part cleared from memory. This prevents an attacker from
    1.11 +trying to trick the client into installing an all-zero TK.
    1.12 +
    1.13 +This fixes the earlier fix in commit
    1.14 +ad00d64e7d8827b3cebd665a0ceb08adabf15e1e ('Fix TK configuration to the
    1.15 +driver in EAPOL-Key 3/4 retry case') which did not take into account
    1.16 +possibility of an extra message 1/4 showing up between retries of
    1.17 +message 3/4.
    1.18 +
    1.19 +Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
    1.20 +---
    1.21 + src/common/wpa_common.h | 1 +
    1.22 + src/rsn_supp/wpa.c      | 5 ++---
    1.23 + src/rsn_supp/wpa_i.h    | 1 -
    1.24 + 3 files changed, 3 insertions(+), 4 deletions(-)
    1.25 +
    1.26 +diff --git a/src/common/wpa_common.h b/src/common/wpa_common.h
    1.27 +index d200285..1021ccb 100644
    1.28 +--- a/src/common/wpa_common.h
    1.29 ++++ b/src/common/wpa_common.h
    1.30 +@@ -215,6 +215,7 @@ struct wpa_ptk {
    1.31 + 	size_t kck_len;
    1.32 + 	size_t kek_len;
    1.33 + 	size_t tk_len;
    1.34 ++	int installed; /* 1 if key has already been installed to driver */
    1.35 + };
    1.36 + 
    1.37 + struct wpa_gtk {
    1.38 +diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c
    1.39 +index 7a2c68d..0550a41 100644
    1.40 +--- a/src/rsn_supp/wpa.c
    1.41 ++++ b/src/rsn_supp/wpa.c
    1.42 +@@ -510,7 +510,6 @@ static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
    1.43 + 		os_memset(buf, 0, sizeof(buf));
    1.44 + 	}
    1.45 + 	sm->tptk_set = 1;
    1.46 +-	sm->tk_to_set = 1;
    1.47 + 
    1.48 + 	kde = sm->assoc_wpa_ie;
    1.49 + 	kde_len = sm->assoc_wpa_ie_len;
    1.50 +@@ -615,7 +614,7 @@ static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
    1.51 + 	enum wpa_alg alg;
    1.52 + 	const u8 *key_rsc;
    1.53 + 
    1.54 +-	if (!sm->tk_to_set) {
    1.55 ++	if (sm->ptk.installed) {
    1.56 + 		wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
    1.57 + 			"WPA: Do not re-install same PTK to the driver");
    1.58 + 		return 0;
    1.59 +@@ -659,7 +658,7 @@ static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
    1.60 + 
    1.61 + 	/* TK is not needed anymore in supplicant */
    1.62 + 	os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
    1.63 +-	sm->tk_to_set = 0;
    1.64 ++	sm->ptk.installed = 1;
    1.65 + 
    1.66 + 	if (sm->wpa_ptk_rekey) {
    1.67 + 		eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
    1.68 +diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h
    1.69 +index 9a54631..41f371f 100644
    1.70 +--- a/src/rsn_supp/wpa_i.h
    1.71 ++++ b/src/rsn_supp/wpa_i.h
    1.72 +@@ -24,7 +24,6 @@ struct wpa_sm {
    1.73 + 	struct wpa_ptk ptk, tptk;
    1.74 + 	int ptk_set, tptk_set;
    1.75 + 	unsigned int msg_3_of_4_ok:1;
    1.76 +-	unsigned int tk_to_set:1;
    1.77 + 	u8 snonce[WPA_NONCE_LEN];
    1.78 + 	u8 anonce[WPA_NONCE_LEN]; /* ANonce from the last 1/4 msg */
    1.79 + 	int renew_snonce;
    1.80 +-- 
    1.81 +2.7.4
    1.82 +