diff options
Diffstat (limited to 'net-wireless/hostapd/files/2017-1/rebased-v2.6-0002-Prevent-reinstallation-of-an-already-in-use-group-ke.patch')
| -rw-r--r-- | net-wireless/hostapd/files/2017-1/rebased-v2.6-0002-Prevent-reinstallation-of-an-already-in-use-group-ke.patch | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/net-wireless/hostapd/files/2017-1/rebased-v2.6-0002-Prevent-reinstallation-of-an-already-in-use-group-ke.patch b/net-wireless/hostapd/files/2017-1/rebased-v2.6-0002-Prevent-reinstallation-of-an-already-in-use-group-ke.patch new file mode 100644 index 000000000000..1802d664add6 --- /dev/null +++ b/net-wireless/hostapd/files/2017-1/rebased-v2.6-0002-Prevent-reinstallation-of-an-already-in-use-group-ke.patch @@ -0,0 +1,250 @@ +From 927f891007c402fefd1ff384645b3f07597c3ede Mon Sep 17 00:00:00 2001 +From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be> +Date: Wed, 12 Jul 2017 16:03:24 +0200 +Subject: [PATCH 2/8] Prevent reinstallation of an already in-use group key + +Track the current GTK and IGTK that is in use and when receiving a +(possibly retransmitted) Group Message 1 or WNM-Sleep Mode Response, do +not install the given key if it is already in use. This prevents an +attacker from trying to trick the client into resetting or lowering the +sequence counter associated to the group key. + +Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be> +--- + src/common/wpa_common.h | 11 +++++ + src/rsn_supp/wpa.c | 116 ++++++++++++++++++++++++++++++------------------ + src/rsn_supp/wpa_i.h | 4 ++ + 3 files changed, 87 insertions(+), 44 deletions(-) + +diff --git a/src/common/wpa_common.h b/src/common/wpa_common.h +index af1d0f0..d200285 100644 +--- a/src/common/wpa_common.h ++++ b/src/common/wpa_common.h +@@ -217,6 +217,17 @@ struct wpa_ptk { + size_t tk_len; + }; + ++struct wpa_gtk { ++ u8 gtk[WPA_GTK_MAX_LEN]; ++ size_t gtk_len; ++}; ++ ++#ifdef CONFIG_IEEE80211W ++struct wpa_igtk { ++ u8 igtk[WPA_IGTK_MAX_LEN]; ++ size_t igtk_len; ++}; ++#endif /* CONFIG_IEEE80211W */ + + /* WPA IE version 1 + * 00-50-f2:1 (OUI:OUI type) +diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c +index 3c47879..95bd7be 100644 +--- a/src/rsn_supp/wpa.c ++++ b/src/rsn_supp/wpa.c +@@ -714,6 +714,15 @@ static int wpa_supplicant_install_gtk(struct wpa_sm *sm, + const u8 *_gtk = gd->gtk; + u8 gtk_buf[32]; + ++ /* Detect possible key reinstallation */ ++ if (sm->gtk.gtk_len == (size_t) gd->gtk_len && ++ os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) { ++ wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, ++ "WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)", ++ gd->keyidx, gd->tx, gd->gtk_len); ++ return 0; ++ } ++ + wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); + wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, + "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)", +@@ -748,6 +757,9 @@ static int wpa_supplicant_install_gtk(struct wpa_sm *sm, + } + os_memset(gtk_buf, 0, sizeof(gtk_buf)); + ++ sm->gtk.gtk_len = gd->gtk_len; ++ os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len); ++ + return 0; + } + +@@ -854,6 +866,48 @@ static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, + } + + ++#ifdef CONFIG_IEEE80211W ++static int wpa_supplicant_install_igtk(struct wpa_sm *sm, ++ const struct wpa_igtk_kde *igtk) ++{ ++ size_t len = wpa_cipher_key_len(sm->mgmt_group_cipher); ++ u16 keyidx = WPA_GET_LE16(igtk->keyid); ++ ++ /* Detect possible key reinstallation */ ++ if (sm->igtk.igtk_len == len && ++ os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) { ++ wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, ++ "WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)", ++ keyidx); ++ return 0; ++ } ++ ++ wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, ++ "WPA: IGTK keyid %d pn %02x%02x%02x%02x%02x%02x", ++ keyidx, MAC2STR(igtk->pn)); ++ wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", igtk->igtk, len); ++ if (keyidx > 4095) { ++ wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, ++ "WPA: Invalid IGTK KeyID %d", keyidx); ++ return -1; ++ } ++ if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher), ++ broadcast_ether_addr, ++ keyidx, 0, igtk->pn, sizeof(igtk->pn), ++ igtk->igtk, len) < 0) { ++ wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, ++ "WPA: Failed to configure IGTK to the driver"); ++ return -1; ++ } ++ ++ sm->igtk.igtk_len = len; ++ os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len); ++ ++ return 0; ++} ++#endif /* CONFIG_IEEE80211W */ ++ ++ + static int ieee80211w_set_keys(struct wpa_sm *sm, + struct wpa_eapol_ie_parse *ie) + { +@@ -864,30 +918,14 @@ static int ieee80211w_set_keys(struct wpa_sm *sm, + if (ie->igtk) { + size_t len; + const struct wpa_igtk_kde *igtk; +- u16 keyidx; ++ + len = wpa_cipher_key_len(sm->mgmt_group_cipher); + if (ie->igtk_len != WPA_IGTK_KDE_PREFIX_LEN + len) + return -1; ++ + igtk = (const struct wpa_igtk_kde *) ie->igtk; +- keyidx = WPA_GET_LE16(igtk->keyid); +- wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: IGTK keyid %d " +- "pn %02x%02x%02x%02x%02x%02x", +- keyidx, MAC2STR(igtk->pn)); +- wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", +- igtk->igtk, len); +- if (keyidx > 4095) { +- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, +- "WPA: Invalid IGTK KeyID %d", keyidx); +- return -1; +- } +- if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher), +- broadcast_ether_addr, +- keyidx, 0, igtk->pn, sizeof(igtk->pn), +- igtk->igtk, len) < 0) { +- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, +- "WPA: Failed to configure IGTK to the driver"); ++ if (wpa_supplicant_install_igtk(sm, igtk) < 0) + return -1; +- } + } + + return 0; +@@ -2307,7 +2345,7 @@ void wpa_sm_deinit(struct wpa_sm *sm) + */ + void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) + { +- int clear_ptk = 1; ++ int clear_keys = 1; + + if (sm == NULL) + return; +@@ -2333,11 +2371,11 @@ void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) + /* Prepare for the next transition */ + wpa_ft_prepare_auth_request(sm, NULL); + +- clear_ptk = 0; ++ clear_keys = 0; + } + #endif /* CONFIG_IEEE80211R */ + +- if (clear_ptk) { ++ if (clear_keys) { + /* + * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if + * this is not part of a Fast BSS Transition. +@@ -2347,6 +2385,10 @@ void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) + os_memset(&sm->ptk, 0, sizeof(sm->ptk)); + sm->tptk_set = 0; + os_memset(&sm->tptk, 0, sizeof(sm->tptk)); ++ os_memset(&sm->gtk, 0, sizeof(sm->gtk)); ++#ifdef CONFIG_IEEE80211W ++ os_memset(&sm->igtk, 0, sizeof(sm->igtk)); ++#endif /* CONFIG_IEEE80211W */ + } + + #ifdef CONFIG_TDLS +@@ -2877,6 +2919,10 @@ void wpa_sm_drop_sa(struct wpa_sm *sm) + os_memset(sm->pmk, 0, sizeof(sm->pmk)); + os_memset(&sm->ptk, 0, sizeof(sm->ptk)); + os_memset(&sm->tptk, 0, sizeof(sm->tptk)); ++ os_memset(&sm->gtk, 0, sizeof(sm->gtk)); ++#ifdef CONFIG_IEEE80211W ++ os_memset(&sm->igtk, 0, sizeof(sm->igtk)); ++#endif /* CONFIG_IEEE80211W */ + #ifdef CONFIG_IEEE80211R + os_memset(sm->xxkey, 0, sizeof(sm->xxkey)); + os_memset(sm->pmk_r0, 0, sizeof(sm->pmk_r0)); +@@ -2949,29 +2995,11 @@ int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) + os_memset(&gd, 0, sizeof(gd)); + #ifdef CONFIG_IEEE80211W + } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) { +- struct wpa_igtk_kde igd; +- u16 keyidx; +- +- os_memset(&igd, 0, sizeof(igd)); +- keylen = wpa_cipher_key_len(sm->mgmt_group_cipher); +- os_memcpy(igd.keyid, buf + 2, 2); +- os_memcpy(igd.pn, buf + 4, 6); +- +- keyidx = WPA_GET_LE16(igd.keyid); +- os_memcpy(igd.igtk, buf + 10, keylen); +- +- wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)", +- igd.igtk, keylen); +- if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher), +- broadcast_ether_addr, +- keyidx, 0, igd.pn, sizeof(igd.pn), +- igd.igtk, keylen) < 0) { +- wpa_printf(MSG_DEBUG, "Failed to install the IGTK in " +- "WNM mode"); +- os_memset(&igd, 0, sizeof(igd)); ++ const struct wpa_igtk_kde *igtk; ++ ++ igtk = (const struct wpa_igtk_kde *) (buf + 2); ++ if (wpa_supplicant_install_igtk(sm, igtk) < 0) + return -1; +- } +- os_memset(&igd, 0, sizeof(igd)); + #endif /* CONFIG_IEEE80211W */ + } else { + wpa_printf(MSG_DEBUG, "Unknown element id"); +diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h +index f653ba6..afc9e37 100644 +--- a/src/rsn_supp/wpa_i.h ++++ b/src/rsn_supp/wpa_i.h +@@ -31,6 +31,10 @@ struct wpa_sm { + u8 rx_replay_counter[WPA_REPLAY_COUNTER_LEN]; + int rx_replay_counter_set; + u8 request_counter[WPA_REPLAY_COUNTER_LEN]; ++ struct wpa_gtk gtk; ++#ifdef CONFIG_IEEE80211W ++ struct wpa_igtk igtk; ++#endif /* CONFIG_IEEE80211W */ + + struct eapol_sm *eapol; /* EAPOL state machine from upper level code */ + +-- +2.7.4 + |