diff options
Diffstat (limited to 'package/network/services/hostapd/patches/003-Prevent-installation-of-an-all-zero-TK.patch')
| -rw-r--r-- | package/network/services/hostapd/patches/003-Prevent-installation-of-an-all-zero-TK.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/package/network/services/hostapd/patches/003-Prevent-installation-of-an-all-zero-TK.patch b/package/network/services/hostapd/patches/003-Prevent-installation-of-an-all-zero-TK.patch new file mode 100644 index 0000000..30679e2 --- /dev/null +++ b/package/network/services/hostapd/patches/003-Prevent-installation-of-an-all-zero-TK.patch @@ -0,0 +1,73 @@ +From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be> +Date: Fri, 29 Sep 2017 04:22:51 +0200 +Subject: [PATCH] Prevent installation of an all-zero TK + +Properly track whether a PTK has already been installed to the driver +and the TK part cleared from memory. This prevents an attacker from +trying to trick the client into installing an all-zero TK. + +This fixes the earlier fix in commit +ad00d64e7d8827b3cebd665a0ceb08adabf15e1e ('Fix TK configuration to the +driver in EAPOL-Key 3/4 retry case') which did not take into account +possibility of an extra message 1/4 showing up between retries of +message 3/4. + +Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be> +--- + +--- a/src/common/wpa_common.h ++++ b/src/common/wpa_common.h +@@ -216,6 +216,7 @@ struct wpa_ptk { + size_t kck_len; + size_t kek_len; + size_t tk_len; ++ int installed; /* 1 if key has already been installed to driver */ + }; + + struct wpa_gtk { +--- a/src/rsn_supp/wpa.c ++++ b/src/rsn_supp/wpa.c +@@ -594,7 +594,6 @@ static void wpa_supplicant_process_1_of_ + 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; +@@ -701,7 +700,7 @@ static int wpa_supplicant_install_ptk(st + enum wpa_alg alg; + const u8 *key_rsc; + +- if (!sm->tk_to_set) { ++ if (sm->ptk.installed) { + wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, + "WPA: Do not re-install same PTK to the driver"); + return 0; +@@ -745,7 +744,7 @@ static int wpa_supplicant_install_ptk(st + + /* TK is not needed anymore in supplicant */ + os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN); +- sm->tk_to_set = 0; ++ sm->ptk.installed = 1; + + if (sm->wpa_ptk_rekey) { + eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); +@@ -4172,6 +4171,7 @@ int fils_process_assoc_resp(struct wpa_s + * takes care of association frame encryption/decryption. */ + /* TK is not needed anymore in supplicant */ + os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN); ++ sm->ptk.installed = 1; + + /* FILS HLP Container */ + fils_process_hlp_container(sm, ie_start, end - ie_start); +--- a/src/rsn_supp/wpa_i.h ++++ b/src/rsn_supp/wpa_i.h +@@ -24,7 +24,6 @@ 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; |