From b7d9bced3056d37857292670ed1a29084ecb0aa1 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 7 Dec 2021 14:47:40 +0100
Subject: [PATCH] hostapd: add support for enabling FILS on AP and client
 interfaces

This is only supported with WPA-enterprise

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 .../network/services/hostapd/files/hostapd.sh | 41 +++++++++++++++++--
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/package/network/services/hostapd/files/hostapd.sh b/package/network/services/hostapd/files/hostapd.sh
index b4aa5e4c853b..30d141878903 100644
--- a/package/network/services/hostapd/files/hostapd.sh
+++ b/package/network/services/hostapd/files/hostapd.sh
@@ -72,6 +72,15 @@ hostapd_append_wpa_key_mgmt() {
 		;;
 	esac
 
+	[ "$fils" -gt 0 ] && {
+		case "$auth_type" in
+			eap*)
+				append wpa_key_mgmt FILS-SHA256
+				[ "${ieee80211r:-0}" -gt 0 ] && append wpa_key_mgmt FT-FILS-SHA256
+			;;
+		esac
+	}
+
 	[ "$auth_osen" = "1" ] && append wpa_key_mgmt "OSEN"
 }
 
@@ -359,6 +368,8 @@ hostapd_common_add_bss_config() {
 
 	config_add_int eap_server
 	config_add_string eap_user_file ca_cert server_cert private_key private_key_passwd server_id
+
+	config_add_boolean fils
 }
 
 hostapd_set_vlan_file() {
@@ -531,8 +542,9 @@ hostapd_set_bss_options() {
 		airtime_bss_weight airtime_bss_limit airtime_sta_weight \
 		multicast_to_unicast proxy_arp per_sta_vif \
 		eap_server eap_user_file ca_cert server_cert private_key private_key_passwd server_id \
-		vendor_elements
+		vendor_elements fils
 
+	set_default fils 0
 	set_default isolate 0
 	set_default maxassoc 0
 	set_default max_inactivity 0
@@ -554,6 +566,8 @@ hostapd_set_bss_options() {
 	set_default airtime_bss_limit 0
 	set_default eap_server 0
 
+	/usr/sbin/hostapd -vfils || fils=0
+
 	append bss_conf "ctrl_interface=/var/run/hostapd"
 	if [ "$isolate" -gt 0 ]; then
 		append bss_conf "ap_isolate=$isolate" "$N"
@@ -654,7 +668,9 @@ hostapd_set_bss_options() {
 				auth_server auth_secret auth_port \
 				dae_client dae_secret dae_port \
 				ownip radius_client_addr \
-				eap_reauth_period request_cui
+				eap_reauth_period request_cui \
+				erp_domain mobility_domain \
+				fils_realm
 
 			# radius can provide VLAN ID for clients
 			vlan_possible=1
@@ -664,6 +680,17 @@ hostapd_set_bss_options() {
 			[ -n "$auth_port" ] || json_get_var auth_port port
 			[ -n "$auth_secret" ] || json_get_var auth_secret key
 
+			[ "$fils" -gt 0 ] && {
+				set_default erp_domain "$mobility_domain"
+				set_default erp_domain "$(echo "$ssid" | md5sum | head -c 8)"
+				set_default fils_realm "$erp_domain"
+
+				append bss_conf "erp_send_reauth_start=1" "$N"
+				append bss_conf "erp_domain=$erp_domain" "$N"
+				append bss_conf "fils_realm=$fils_realm" "$N"
+				append bss_conf "fils_cache_id=$(echo "$fils_realm" | md5sum | head -c 4)" "$N"
+			}
+
 			set_default auth_port 1812
 			set_default dae_port 3799
 			set_default request_cui 0
@@ -853,6 +880,10 @@ hostapd_set_bss_options() {
 				done
 			fi
 		fi
+		if [ "$fils" -gt 0 ]; then
+			json_get_vars fils_realm
+			set_default fils_realm "$(echo "$ssid" | md5sum | head -c 8)"
+		fi
 
 		append bss_conf "wpa_disable_eapol_key_retries=$wpa_disable_eapol_key_retries" "$N"
 
@@ -877,7 +908,7 @@ hostapd_set_bss_options() {
 		fi
 
 		append bss_conf "okc=$auth_cache" "$N"
-		[ "$auth_cache" = 0 ] && append bss_conf "disable_pmksa_caching=1" "$N"
+		[ "$auth_cache" = 0 -a "$fils" = 0 ] && append bss_conf "disable_pmksa_caching=1" "$N"
 
 		# RSN -> allow management frame protection
 		case "$ieee80211w" in
@@ -1031,6 +1062,7 @@ hostapd_set_bss_options() {
 
 	if [ "$eap_server" = "1" ]; then
 		append bss_conf "eap_server=1" "$N"
+		append bss_conf "eap_server_erp=1" "$N"
 		[ -n "$eap_user_file" ] && append bss_conf "eap_user_file=$eap_user_file" "$N"
 		[ -n "$ca_cert" ] && append bss_conf "ca_cert=$ca_cert" "$N"
 		[ -n "$server_cert" ] && append bss_conf "server_cert=$server_cert" "$N"
@@ -1197,7 +1229,7 @@ wpa_supplicant_add_network() {
 	json_get_vars \
 		ssid bssid key \
 		basic_rate mcast_rate \
-		ieee80211w ieee80211r \
+		ieee80211w ieee80211r fils \
 		multi_ap \
 		default_disabled
 
@@ -1289,6 +1321,7 @@ wpa_supplicant_add_network() {
 
 			json_get_vars eap_type identity anonymous_identity ca_cert ca_cert_usesystem
 
+			[ "$fils" -gt 0 ] && append network_data "erp=1" "$N$T"
 			if [ "$ca_cert_usesystem" -eq "1" -a -f "/etc/ssl/certs/ca-certificates.crt" ]; then
 				append network_data "ca_cert=\"/etc/ssl/certs/ca-certificates.crt\"" "$N$T"
 			else
-- 
2.30.2