gnu: wpa-supplicant: Fix "KRACK" key reinstallation attacks [security fixes].

Fixes CVE-2017-{13078,13079,13080,13081,13082,13087,13088}.

See these announcements for more information:
https://w1.fi/security/2017-1/wpa-packet-number-reuse-with-replayed-messages.txt
https://www.krackattacks.com/

* gnu/packages/patches/wpa-supplicant-CVE-2017-13082.patch,
gnu/packages/patches/wpa-supplicant-fix-key-reuse.patch,
gnu/packages/patches/wpa-supplicant-fix-nonce-reuse.patch
gnu/packages/patches/wpa-supplicant-fix-zeroed-keys.patch,
gnu/packages/patches/wpa-supplicant-krack-followups.patch: New files.
* gnu/packages/admin.scm (wpa-supplicant-minimal)[source]: Use them.
* gnu/local.mk (dist_patch_DATA): Add them.

1 files changed, 275 insertions, 0 deletions

diff --git a/gnu/packages/patches/wpa-supplicant-krack-followups.patch b/gnu/packages/patches/wpa-supplicant-krack-followups.patch
new file mode 100644
index 0000000000..00904addb1
--- /dev/null
+++ b/gnu/packages/patches/wpa-supplicant-krack-followups.patch
@@ -0,0 +1,275 @@
+These three patches are follow-ups to the bug fixes for the 'KRACK' key
+re-installation attacks on Wi-Fi's WPA2 security protocol. See upstream
+security announcement for more information:
+
+https://w1.fi/security/2017-1/wpa-packet-number-reuse-with-replayed-messages.txt
+
+These three patches copied from upstream:
+
+https://w1.fi/security/2017-1/rebased-v2.6-0006-TDLS-Reject-TPK-TK-reconfiguration.patch
+https://w1.fi/security/2017-1/rebased-v2.6-0007-WNM-Ignore-WNM-Sleep-Mode-Response-without-pending-r.patch
+https://w1.fi/security/2017-1/rebased-v2.6-0008-FT-Do-not-allow-multiple-Reassociation-Response-fram.patch
+
+From 6c4bed4f47d1960ec04981a9d50e5076aea5223d Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Fri, 22 Sep 2017 11:03:15 +0300
+Subject: [PATCH 6/8] TDLS: Reject TPK-TK reconfiguration
+
+Do not try to reconfigure the same TPK-TK to the driver after it has
+been successfully configured. This is an explicit check to avoid issues
+related to resetting the TX/RX packet number. There was already a check
+for this for TPK M2 (retries of that message are ignored completely), so
+that behavior does not get modified.
+
+For TPK M3, the TPK-TK could have been reconfigured, but that was
+followed by immediate teardown of the link due to an issue in updating
+the STA entry. Furthermore, for TDLS with any real security (i.e.,
+ignoring open/WEP), the TPK message exchange is protected on the AP path
+and simple replay attacks are not feasible.
+
+As an additional corner case, make sure the local nonce gets updated if
+the peer uses a very unlikely "random nonce" of all zeros.
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ src/rsn_supp/tdls.c | 38 ++++++++++++++++++++++++++++++++++++--
+ 1 file changed, 36 insertions(+), 2 deletions(-)
+
+diff --git a/src/rsn_supp/tdls.c b/src/rsn_supp/tdls.c
+index e424168..9eb9738 100644
+--- a/src/rsn_supp/tdls.c
++++ b/src/rsn_supp/tdls.c
+@@ -112,6 +112,7 @@ struct wpa_tdls_peer {
+ 		u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
+ 	} tpk;
+ 	int tpk_set;
++	int tk_set; /* TPK-TK configured to the driver */
+ 	int tpk_success;
+ 	int tpk_in_progress;
+ 
+@@ -192,6 +193,20 @@ static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
+ 	u8 rsc[6];
+ 	enum wpa_alg alg;
+ 
++	if (peer->tk_set) {
++		/*
++		 * This same TPK-TK has already been configured to the driver
++		 * and this new configuration attempt (likely due to an
++		 * unexpected retransmitted frame) would result in clearing
++		 * the TX/RX sequence number which can break security, so must
++		 * not allow that to happen.
++		 */
++		wpa_printf(MSG_INFO, "TDLS: TPK-TK for the peer " MACSTR
++			   " has already been configured to the driver - do not reconfigure",
++			   MAC2STR(peer->addr));
++		return -1;
++	}
++
+ 	os_memset(rsc, 0, 6);
+ 
+ 	switch (peer->cipher) {
+@@ -209,12 +224,15 @@ static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
+ 		return -1;
+ 	}
+ 
++	wpa_printf(MSG_DEBUG, "TDLS: Configure pairwise key for peer " MACSTR,
++		   MAC2STR(peer->addr));
+ 	if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
+ 			   rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
+ 		wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
+ 			   "driver");
+ 		return -1;
+ 	}
++	peer->tk_set = 1;
+ 	return 0;
+ }
+ 
+@@ -696,7 +714,7 @@ static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
+ 	peer->cipher = 0;
+ 	peer->qos_info = 0;
+ 	peer->wmm_capable = 0;
+-	peer->tpk_set = peer->tpk_success = 0;
++	peer->tk_set = peer->tpk_set = peer->tpk_success = 0;
+ 	peer->chan_switch_enabled = 0;
+ 	os_memset(&peer->tpk, 0, sizeof(peer->tpk));
+ 	os_memset(peer->inonce, 0, WPA_NONCE_LEN);
+@@ -1159,6 +1177,7 @@ skip_rsnie:
+ 		wpa_tdls_peer_free(sm, peer);
+ 		return -1;
+ 	}
++	peer->tk_set = 0; /* A new nonce results in a new TK */
+ 	wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
+ 		    peer->inonce, WPA_NONCE_LEN);
+ 	os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
+@@ -1751,6 +1770,19 @@ static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
+ }
+ 
+ 
++static int tdls_nonce_set(const u8 *nonce)
++{
++	int i;
++
++	for (i = 0; i < WPA_NONCE_LEN; i++) {
++		if (nonce[i])
++			return 1;
++	}
++
++	return 0;
++}
++
++
+ static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
+ 				   const u8 *buf, size_t len)
+ {
+@@ -2004,7 +2036,8 @@ skip_rsn:
+ 	peer->rsnie_i_len = kde.rsn_ie_len;
+ 	peer->cipher = cipher;
+ 
+-	if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
++	if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0 ||
++	    !tdls_nonce_set(peer->inonce)) {
+ 		/*
+ 		 * There is no point in updating the RNonce for every obtained
+ 		 * TPK M1 frame (e.g., retransmission due to timeout) with the
+@@ -2020,6 +2053,7 @@ skip_rsn:
+ 				"TDLS: Failed to get random data for responder nonce");
+ 			goto error;
+ 		}
++		peer->tk_set = 0; /* A new nonce results in a new TK */
+ 	}
+ 
+ #if 0
+-- 
+2.7.4
+
+From 53c5eb58e95004f86e65ee9fbfccbc291b139057 Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Fri, 22 Sep 2017 11:25:02 +0300
+Subject: [PATCH 7/8] WNM: Ignore WNM-Sleep Mode Response without pending
+ request
+
+Commit 03ed0a52393710be6bdae657d1b36efa146520e5 ('WNM: Ignore WNM-Sleep
+Mode Response if WNM-Sleep Mode has not been used') started ignoring the
+response when no WNM-Sleep Mode Request had been used during the
+association. This can be made tighter by clearing the used flag when
+successfully processing a response. This adds an additional layer of
+protection against unexpected retransmissions of the response frame.
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ wpa_supplicant/wnm_sta.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
+index 1b3409c..67a07ff 100644
+--- a/wpa_supplicant/wnm_sta.c
++++ b/wpa_supplicant/wnm_sta.c
+@@ -260,7 +260,7 @@ static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
+ 
+ 	if (!wpa_s->wnmsleep_used) {
+ 		wpa_printf(MSG_DEBUG,
+-			   "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode has not been used in this association");
++			   "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
+ 		return;
+ 	}
+ 
+@@ -299,6 +299,8 @@ static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
+ 		return;
+ 	}
+ 
++	wpa_s->wnmsleep_used = 0;
++
+ 	if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
+ 	    wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
+ 		wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
+-- 
+2.7.4
+
+https://w1.fi/security/2017-1/wpa-packet-number-reuse-with-replayed-messages.txt
+
+Patch copied from upstream:
+
+https://w1.fi/security/2017-1/rebased-v2.6-0008-FT-Do-not-allow-multiple-Reassociation-Response-fram.patch
+
+From b372ab0b7daea719749194dc554b26e6367603f2 Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Fri, 22 Sep 2017 12:06:37 +0300
+Subject: [PATCH 8/8] FT: Do not allow multiple Reassociation Response frames
+
+The driver is expected to not report a second association event without
+the station having explicitly request a new association. As such, this
+case should not be reachable. However, since reconfiguring the same
+pairwise or group keys to the driver could result in nonce reuse issues,
+be extra careful here and do an additional state check to avoid this
+even if the local driver ends up somehow accepting an unexpected
+Reassociation Response frame.
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ src/rsn_supp/wpa.c    | 3 +++
+ src/rsn_supp/wpa_ft.c | 8 ++++++++
+ src/rsn_supp/wpa_i.h  | 1 +
+ 3 files changed, 12 insertions(+)
+
+diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c
+index 0550a41..2a53c6f 100644
+--- a/src/rsn_supp/wpa.c
++++ b/src/rsn_supp/wpa.c
+@@ -2440,6 +2440,9 @@ void wpa_sm_notify_disassoc(struct wpa_sm *sm)
+ #ifdef CONFIG_TDLS
+ 	wpa_tdls_disassoc(sm);
+ #endif /* CONFIG_TDLS */
++#ifdef CONFIG_IEEE80211R
++	sm->ft_reassoc_completed = 0;
++#endif /* CONFIG_IEEE80211R */
+ 
+ 	/* Keys are not needed in the WPA state machine anymore */
+ 	wpa_sm_drop_sa(sm);
+diff --git a/src/rsn_supp/wpa_ft.c b/src/rsn_supp/wpa_ft.c
+index 205793e..d45bb45 100644
+--- a/src/rsn_supp/wpa_ft.c
++++ b/src/rsn_supp/wpa_ft.c
+@@ -153,6 +153,7 @@ static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
+ 	u16 capab;
+ 
+ 	sm->ft_completed = 0;
++	sm->ft_reassoc_completed = 0;
+ 
+ 	buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
+ 		2 + sm->r0kh_id_len + ric_ies_len + 100;
+@@ -681,6 +682,11 @@ int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
+ 		return -1;
+ 	}
+ 
++	if (sm->ft_reassoc_completed) {
++		wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
++		return 0;
++	}
++
+ 	if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
+ 		wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
+ 		return -1;
+@@ -781,6 +787,8 @@ int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
+ 		return -1;
+ 	}
+ 
++	sm->ft_reassoc_completed = 1;
++
+ 	if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
+ 		return -1;
+ 
+diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h
+index 41f371f..56f88dc 100644
+--- a/src/rsn_supp/wpa_i.h
++++ b/src/rsn_supp/wpa_i.h
+@@ -128,6 +128,7 @@ struct wpa_sm {
+ 	size_t r0kh_id_len;
+ 	u8 r1kh_id[FT_R1KH_ID_LEN];
+ 	int ft_completed;
++	int ft_reassoc_completed;
+ 	int over_the_ds_in_progress;
+ 	u8 target_ap[ETH_ALEN]; /* over-the-DS target AP */
+ 	int set_ptk_after_assoc;
+-- 
+2.7.4
+