hostapd: Fix AP mode PMF disconnection protection bypass

This fixes
* CVE-2019-16275 AP mode PMF disconnection protection bypass
https://w1.fi/security/2019-7/ap-mode-pmf-disconnection-protection-bypass.txt

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit a6981604b30bc1ddc1713b368fe853d89c2ba40d)

4 files changed, 72 insertions, 6 deletions

diff --git a/package/network/services/hostapd/patches/067-0001-AP-Silently-ignore-management-frame-from-unexpected-.patch b/package/network/services/hostapd/patches/067-0001-AP-Silently-ignore-management-frame-from-unexpected-.patch
new file mode 100644
index 0000000000..c1439fd21c
--- /dev/null
+++ b/package/network/services/hostapd/patches/067-0001-AP-Silently-ignore-management-frame-from-unexpected-.patch
@@ -0,0 +1,66 @@
+From 8c07fa9eda13e835f3f968b2e1c9a8be3a851ff9 Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Thu, 29 Aug 2019 11:52:04 +0300
+Subject: [PATCH] AP: Silently ignore management frame from unexpected source
+ address
+
+Do not process any received Management frames with unexpected/invalid SA
+so that we do not add any state for unexpected STA addresses or end up
+sending out frames to unexpected destination. This prevents unexpected
+sequences where an unprotected frame might end up causing the AP to send
+out a response to another device and that other device processing the
+unexpected response.
+
+In particular, this prevents some potential denial of service cases
+where the unexpected response frame from the AP might result in a
+connected station dropping its association.
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ src/ap/drv_callbacks.c | 13 +++++++++++++
+ src/ap/ieee802_11.c    | 12 ++++++++++++
+ 2 files changed, 25 insertions(+)
+
+--- a/src/ap/drv_callbacks.c
++++ b/src/ap/drv_callbacks.c
+@@ -129,6 +129,19 @@ int hostapd_notif_assoc(struct hostapd_d
+ 			   "hostapd_notif_assoc: Skip event with no address");
+ 		return -1;
+ 	}
++
++	if (is_multicast_ether_addr(addr) ||
++	    is_zero_ether_addr(addr) ||
++	    os_memcmp(addr, hapd->own_addr, ETH_ALEN) == 0) {
++		/* Do not process any frames with unexpected/invalid SA so that
++		 * we do not add any state for unexpected STA addresses or end
++		 * up sending out frames to unexpected destination. */
++		wpa_printf(MSG_DEBUG, "%s: Invalid SA=" MACSTR
++			   " in received indication - ignore this indication silently",
++			   __func__, MAC2STR(addr));
++		return 0;
++	}
++
+ 	random_add_randomness(addr, ETH_ALEN);
+ 
+ 	hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
+--- a/src/ap/ieee802_11.c
++++ b/src/ap/ieee802_11.c
+@@ -3978,6 +3978,18 @@ int ieee802_11_mgmt(struct hostapd_data
+ 	fc = le_to_host16(mgmt->frame_control);
+ 	stype = WLAN_FC_GET_STYPE(fc);
+ 
++	if (is_multicast_ether_addr(mgmt->sa) ||
++	    is_zero_ether_addr(mgmt->sa) ||
++	    os_memcmp(mgmt->sa, hapd->own_addr, ETH_ALEN) == 0) {
++		/* Do not process any frames with unexpected/invalid SA so that
++		 * we do not add any state for unexpected STA addresses or end
++		 * up sending out frames to unexpected destination. */
++		wpa_printf(MSG_DEBUG, "MGMT: Invalid SA=" MACSTR
++			   " in received frame - ignore this frame silently",
++			   MAC2STR(mgmt->sa));
++		return 0;
++	}
++
+ 	if (stype == WLAN_FC_STYPE_BEACON) {
+ 		handle_beacon(hapd, mgmt, len, fi);
+ 		return 1;
diff --git a/package/network/services/hostapd/patches/200-multicall.patch b/package/network/services/hostapd/patches/200-multicall.patch
index 9c7936695a..6d742ace77 100644
--- a/package/network/services/hostapd/patches/200-multicall.patch
+++ b/package/network/services/hostapd/patches/200-multicall.patch
@@ -178,7 +178,7 @@
  /*
 --- a/src/ap/drv_callbacks.c
 +++ b/src/ap/drv_callbacks.c
-@@ -1527,8 +1527,8 @@ static void hostapd_event_wds_sta_interf
+@@ -1540,8 +1540,8 @@ static void hostapd_event_wds_sta_interf
  }
  
  
@@ -189,7 +189,7 @@
  {
  	struct hostapd_data *hapd = ctx;
  #ifndef CONFIG_NO_STDOUT_DEBUG
-@@ -1757,7 +1757,7 @@ void wpa_supplicant_event(void *ctx, enu
+@@ -1770,7 +1770,7 @@ void wpa_supplicant_event(void *ctx, enu
  }
  
  
diff --git a/package/network/services/hostapd/patches/550-hostapd-Add-Multi-AP-protocol-support.patch b/package/network/services/hostapd/patches/550-hostapd-Add-Multi-AP-protocol-support.patch
index 812f794eda..2ed38f8958 100644
--- a/package/network/services/hostapd/patches/550-hostapd-Add-Multi-AP-protocol-support.patch
+++ b/package/network/services/hostapd/patches/550-hostapd-Add-Multi-AP-protocol-support.patch
@@ -191,7 +191,7 @@ Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
  #ifdef CONFIG_P2P
  	if (sta && sta->p2p_ie && hapd->p2p_group) {
  		struct wpabuf *p2p_resp_ie;
-@@ -4236,7 +4311,7 @@ static void handle_assoc_cb(struct hosta
+@@ -4248,7 +4323,7 @@ static void handle_assoc_cb(struct hosta
  		sta->flags |= WLAN_STA_WDS;
  	}
  
diff --git a/package/network/services/hostapd/patches/600-ubus_support.patch b/package/network/services/hostapd/patches/600-ubus_support.patch
index db037c6491..1125627bfd 100644
--- a/package/network/services/hostapd/patches/600-ubus_support.patch
+++ b/package/network/services/hostapd/patches/600-ubus_support.patch
@@ -193,7 +193,7 @@
  	sta = ap_get_sta(hapd, mgmt->sa);
  	if (sta == NULL) {
  		wpa_msg(hapd->msg_ctx, MSG_DEBUG, "Station " MACSTR " trying "
-@@ -4077,7 +4106,7 @@ int ieee802_11_mgmt(struct hostapd_data
+@@ -4089,7 +4118,7 @@ int ieee802_11_mgmt(struct hostapd_data
  
  
  	if (stype == WLAN_FC_STYPE_PROBE_REQ) {
@@ -202,7 +202,7 @@
  		return 1;
  	}
  
-@@ -4097,17 +4126,17 @@ int ieee802_11_mgmt(struct hostapd_data
+@@ -4109,17 +4138,17 @@ int ieee802_11_mgmt(struct hostapd_data
  	switch (stype) {
  	case WLAN_FC_STYPE_AUTH:
  		wpa_printf(MSG_DEBUG, "mgmt::auth");
@@ -292,7 +292,7 @@
  
  	if (addr == NULL) {
  		/*
-@@ -195,6 +199,12 @@ int hostapd_notif_assoc(struct hostapd_d
+@@ -208,6 +212,12 @@ int hostapd_notif_assoc(struct hostapd_d
  		goto fail;
  	}