[source] hostapd: add wpa_disable_eapol_key_retries option

[LEDE Commits]

stintel pushed a commit to source.git, branch master:
https://git.lede-project.org/c5f97c9372da3229350184fb263c97d9ea8944c5

commit c5f97c9372da3229350184fb263c97d9ea8944c5
Author: Stijn Tintel <stijn at linux-ipv6.be>
AuthorDate: Tue Oct 17 16:35:03 2017 +0300

    hostapd: add wpa_disable_eapol_key_retries option
    
    Commit 2127425434046ae2b9f02fdbbdd37cac447af19c introduced an AP-side
    workaround for key reinstallation attacks. This option can be used to
    mitigate KRACK on the station side, in case those stations cannot be
    updated. Since many devices are out there will not receive an update
    anytime soon (if at all), it makes sense to include this workaround.
    
    Unfortunately this can cause interoperability issues and reduced
    robustness of key negotiation, so disable the workaround by default, and
    add an option to allow the user to enable it if he deems necessary.
    
    Signed-off-by: Stijn Tintel <stijn at linux-ipv6.be>
---
 package/network/services/hostapd/files/hostapd.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/package/network/services/hostapd/files/hostapd.sh b/package/network/services/hostapd/files/hostapd.sh
index 3766b7a..16925d5 100644
--- a/package/network/services/hostapd/files/hostapd.sh
+++ b/package/network/services/hostapd/files/hostapd.sh
@@ -149,6 +149,7 @@ hostapd_common_add_bss_config() {
 	config_add_int \
 		wep_rekey eap_reauth_period \
 		wpa_group_rekey wpa_pair_rekey wpa_master_rekey
+	config_add_boolean wpa_disable_eapol_key_retries
 
 	config_add_boolean rsn_preauth auth_cache
 	config_add_int ieee80211w
@@ -214,6 +215,7 @@ hostapd_set_bss_options() {
 
 	json_get_vars \
 		wep_rekey wpa_group_rekey wpa_pair_rekey wpa_master_rekey \
+		wpa_disable_eapol_key_retries \
 		maxassoc max_inactivity disassoc_low_ack isolate auth_cache \
 		wps_pushbutton wps_label ext_registrar wps_pbc_in_m1 wps_ap_setup_locked \
 		wps_independent wps_device_type wps_device_name wps_manufacturer wps_pin \
@@ -229,6 +231,7 @@ hostapd_set_bss_options() {
 	set_default hidden 0
 	set_default wmm 1
 	set_default uapsd 1
+	set_default wpa_disable_eapol_key_retries 0
 	set_default eapol_version 0
 	set_default acct_port 1813
 
@@ -416,6 +419,8 @@ hostapd_set_bss_options() {
 			done
 		fi
 
+		append bss_conf "wpa_disable_eapol_key_retries=$wpa_disable_eapol_key_retries" "$N"
+
 		hostapd_append_wpa_key_mgmt
 		[ -n "$wpa_key_mgmt" ] && append bss_conf "wpa_key_mgmt=$wpa_key_mgmt" "$N"
 	fi