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