android-wifi-upgrade

convert WiFi passwords from old Android wpa_supplicant.conf to newer (post-Oreo) WifiConfigStore.xml

This perl script reads old wpa_supplicant.conf on STDIN, and outputs new WifiConfigStore.xml to STDOUT

Description

For me, upgrading LG G3 from LineageOS 14.1 (Android 7.1.2 "Nougat") to LineageOS 16.0 (Android 9 "Pie") resulted in all my wifi password being lost. The reason is the information is no longer kept in /data/misc/wifi/wpa_supplicant.conf but instead in /data/misc/wifi/WifiConfigStore.xml

This script is a quick hack to convert (most of the) passwords to new format so I don't have to remember and type them all again.

All of the project is released under Apache 2.0 license (see LICENSE file).

Usage

adb root

(make sure you have first set permissions in developer settings root ADB)
adb pull /data/misc/wifi/wpa_supplicant.conf

(or in whatever location it is in your device - maybe /data/wifi/bcm_supp.conf or /data/misc/wifi/wpa.conf)
./convert_wifi.pl < wpa_supplicant.conf > WifiConfigStore.xml

(and check any warnings / error outputed on the screen)
disable WiFi on your phone
push new config on the phone (to correct location - check first where is current WifiConfigStore.xml):

adb push WifiConfigStore.xml /data/misc/wifi/WifiConfigStore.xml
adb shell chmod 600 /data/misc/wifi/WifiConfigStore.xml
adb shell chown system:system /data/misc/wifi/WifiConfigStore.xml
adb shell rm /data/misc/wifi/WifiConfigStore.xml.encrypted-checksum
adb reboot

Note that location of WifiConfigStore.xml on your device might be something other than /data/misc/wifi (like /data/misc/apexdata/com.android.wifi), so you need to verify that first (and update the commands above accordingly).

enable WiFi on your phone

Troubleshooting

some phone require WAPI support, and others do not support it. If master git branch at https://github.com/mnalis/android-wifi-upgrade report errors when you try to upload WifiConfigStore.xml, try wapi git branch: https://github.com/mnalis/android-wifi-upgrade/tree/wapi

This is because different phones have different config format requirements, see #6 for details
if all else fails, please report new issue at https://github.com/mnalis/android-wifi-upgrade/issues

TODO

Never write XML by hand as I do here! It will seem to work in most cases, and then break badly on some non-escaped value or similar.
only config supports implemented currently are open networks (no PSK), WEP networks with up to 4 preshared keys, and WPA2 networks (with ASCII PSK); WPA1 may be or not be supported per chosen bit masks, but was not tested directly. Maybe support other (WPA1, EAP-xxx thingies)?
set uid to 1000 or 0 ? or -1 ?
- there are UIDs in "CreatorUid", "LastUpdateUid", "LastConnectUid", "CreatorName" => "android.uid.system:1000", "LastUpdateName" => "android.uid.system:1000"... are they all same or may be different?
parse id_str (url_decode, JSON) for creatorUid & configKey ?
where to put "priority" and "bssid" from wpa_supplicant.conf ?
- possibly, bssid maps to DefaultGwMacAddress ?
wpa_supplicant.conf: is "disabled" always "1" ?
warn for all unhandled key/value pairs (or even better, handle them correctly)
add options to select 'WAPI' ($AllowedProtocols) and $ConfigKey formats, instead of using different git branches (need to fix make check too then)
FIXMEs in code