/usr/share/dbus-1/system-services/fi.epitest.hostap.WPASupplicant.service is in wpasupplicant 2:2.6-15ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [D-BUS Service]
Name=fi.epitest.hostap.WPASupplicant
Exec=/sbin/wpa_supplicant -u -s -O /run/wpa_supplicant
User=root
SystemdService=wpa_supplicant.service
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