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, 182 insertions, 0 deletions

diff --git a/gnu/packages/patches/wpa-supplicant-CVE-2017-13082.patch b/gnu/packages/patches/wpa-supplicant-CVE-2017-13082.patch
new file mode 100644
index 0000000000..371456d157
--- /dev/null
+++ b/gnu/packages/patches/wpa-supplicant-CVE-2017-13082.patch
@@ -0,0 +1,182 @@
+Fix CVE-2017-13082:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-13082
+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-v2.6-0001-hostapd-Avoid-key-reinstallation-in-FT-handshake.patch
+
+From cf4cab804c7afd5c45505528a8d16e46163243a2 Mon Sep 17 00:00:00 2001
+From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
+Date: Fri, 14 Jul 2017 15:15:35 +0200
+Subject: [PATCH 1/8] hostapd: Avoid key reinstallation in FT handshake
+
+Do not reinstall TK to the driver during Reassociation Response frame
+processing if the first attempt of setting the TK succeeded. This avoids
+issues related to clearing the TX/RX PN that could result in reusing
+same PN values for transmitted frames (e.g., due to CCM nonce reuse and
+also hitting replay protection on the receiver) and accepting replayed
+frames on RX side.
+
+This issue was introduced by the commit
+0e84c25434e6a1f283c7b4e62e483729085b78d2 ('FT: Fix PTK configuration in
+authenticator') which allowed wpa_ft_install_ptk() to be called multiple
+times with the same PTK. While the second configuration attempt is
+needed with some drivers, it must be done only if the first attempt
+failed.
+
+Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
+---
+ src/ap/ieee802_11.c  | 16 +++++++++++++---
+ src/ap/wpa_auth.c    | 11 +++++++++++
+ src/ap/wpa_auth.h    |  3 ++-
+ src/ap/wpa_auth_ft.c | 10 ++++++++++
+ src/ap/wpa_auth_i.h  |  1 +
+ 5 files changed, 37 insertions(+), 4 deletions(-)
+
+diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
+index 4e04169..333035f 100644
+--- a/src/ap/ieee802_11.c
++++ b/src/ap/ieee802_11.c
+@@ -1841,6 +1841,7 @@ static int add_associated_sta(struct hostapd_data *hapd,
+ {
+ 	struct ieee80211_ht_capabilities ht_cap;
+ 	struct ieee80211_vht_capabilities vht_cap;
++	int set = 1;
+ 
+ 	/*
+ 	 * Remove the STA entry to ensure the STA PS state gets cleared and
+@@ -1848,9 +1849,18 @@ static int add_associated_sta(struct hostapd_data *hapd,
+ 	 * FT-over-the-DS, where a station re-associates back to the same AP but
+ 	 * skips the authentication flow, or if working with a driver that
+ 	 * does not support full AP client state.
++	 *
++	 * Skip this if the STA has already completed FT reassociation and the
++	 * TK has been configured since the TX/RX PN must not be reset to 0 for
++	 * the same key.
+ 	 */
+-	if (!sta->added_unassoc)
++	if (!sta->added_unassoc &&
++	    (!(sta->flags & WLAN_STA_AUTHORIZED) ||
++	     !wpa_auth_sta_ft_tk_already_set(sta->wpa_sm))) {
+ 		hostapd_drv_sta_remove(hapd, sta->addr);
++		wpa_auth_sm_event(sta->wpa_sm, WPA_DRV_STA_REMOVED);
++		set = 0;
++	}
+ 
+ #ifdef CONFIG_IEEE80211N
+ 	if (sta->flags & WLAN_STA_HT)
+@@ -1873,11 +1883,11 @@ static int add_associated_sta(struct hostapd_data *hapd,
+ 			    sta->flags & WLAN_STA_VHT ? &vht_cap : NULL,
+ 			    sta->flags | WLAN_STA_ASSOC, sta->qosinfo,
+ 			    sta->vht_opmode, sta->p2p_ie ? 1 : 0,
+-			    sta->added_unassoc)) {
++			    set)) {
+ 		hostapd_logger(hapd, sta->addr,
+ 			       HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_NOTICE,
+ 			       "Could not %s STA to kernel driver",
+-			       sta->added_unassoc ? "set" : "add");
++			       set ? "set" : "add");
+ 
+ 		if (sta->added_unassoc) {
+ 			hostapd_drv_sta_remove(hapd, sta->addr);
+diff --git a/src/ap/wpa_auth.c b/src/ap/wpa_auth.c
+index 3587086..707971d 100644
+--- a/src/ap/wpa_auth.c
++++ b/src/ap/wpa_auth.c
+@@ -1745,6 +1745,9 @@ int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
+ #else /* CONFIG_IEEE80211R */
+ 		break;
+ #endif /* CONFIG_IEEE80211R */
++	case WPA_DRV_STA_REMOVED:
++		sm->tk_already_set = FALSE;
++		return 0;
+ 	}
+ 
+ #ifdef CONFIG_IEEE80211R
+@@ -3250,6 +3253,14 @@ int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
+ }
+ 
+ 
++int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm)
++{
++	if (!sm || !wpa_key_mgmt_ft(sm->wpa_key_mgmt))
++		return 0;
++	return sm->tk_already_set;
++}
++
++
+ int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
+ 			     struct rsn_pmksa_cache_entry *entry)
+ {
+diff --git a/src/ap/wpa_auth.h b/src/ap/wpa_auth.h
+index 0de8d97..97461b0 100644
+--- a/src/ap/wpa_auth.h
++++ b/src/ap/wpa_auth.h
+@@ -267,7 +267,7 @@ void wpa_receive(struct wpa_authenticator *wpa_auth,
+ 		 u8 *data, size_t data_len);
+ enum wpa_event {
+ 	WPA_AUTH, WPA_ASSOC, WPA_DISASSOC, WPA_DEAUTH, WPA_REAUTH,
+-	WPA_REAUTH_EAPOL, WPA_ASSOC_FT
++	WPA_REAUTH_EAPOL, WPA_ASSOC_FT, WPA_DRV_STA_REMOVED
+ };
+ void wpa_remove_ptk(struct wpa_state_machine *sm);
+ int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event);
+@@ -280,6 +280,7 @@ int wpa_auth_pairwise_set(struct wpa_state_machine *sm);
+ int wpa_auth_get_pairwise(struct wpa_state_machine *sm);
+ int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm);
+ int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm);
++int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm);
+ int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
+ 			     struct rsn_pmksa_cache_entry *entry);
+ struct rsn_pmksa_cache_entry *
+diff --git a/src/ap/wpa_auth_ft.c b/src/ap/wpa_auth_ft.c
+index 42242a5..e63b99a 100644
+--- a/src/ap/wpa_auth_ft.c
++++ b/src/ap/wpa_auth_ft.c
+@@ -780,6 +780,14 @@ void wpa_ft_install_ptk(struct wpa_state_machine *sm)
+ 		return;
+ 	}
+ 
++	if (sm->tk_already_set) {
++		/* Must avoid TK reconfiguration to prevent clearing of TX/RX
++		 * PN in the driver */
++		wpa_printf(MSG_DEBUG,
++			   "FT: Do not re-install same PTK to the driver");
++		return;
++	}
++
+ 	/* FIX: add STA entry to kernel/driver here? The set_key will fail
+ 	 * most likely without this.. At the moment, STA entry is added only
+ 	 * after association has been completed. This function will be called
+@@ -792,6 +800,7 @@ void wpa_ft_install_ptk(struct wpa_state_machine *sm)
+ 
+ 	/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
+ 	sm->pairwise_set = TRUE;
++	sm->tk_already_set = TRUE;
+ }
+ 
+ 
+@@ -898,6 +907,7 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
+ 
+ 	sm->pairwise = pairwise;
+ 	sm->PTK_valid = TRUE;
++	sm->tk_already_set = FALSE;
+ 	wpa_ft_install_ptk(sm);
+ 
+ 	buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
+diff --git a/src/ap/wpa_auth_i.h b/src/ap/wpa_auth_i.h
+index 72b7eb3..7fd8f05 100644
+--- a/src/ap/wpa_auth_i.h
++++ b/src/ap/wpa_auth_i.h
+@@ -65,6 +65,7 @@ struct wpa_state_machine {
+ 	struct wpa_ptk PTK;
+ 	Boolean PTK_valid;
+ 	Boolean pairwise_set;
++	Boolean tk_already_set;
+ 	int keycount;
+ 	Boolean Pair;
+ 	struct wpa_key_replay_counter {
+-- 
+2.7.4
+