/usr/share/polkit-1/actions/com.ubuntu.AccountsService.policy is in accountsservice-ubuntu-schemas 0.0.5+16.04.20160307-0ubuntu1.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | <?xml version="1.0" encoding="UTF-8"?>
<policyconfig>
<!-- Same as org.freedesktop.accounts.user-administration, but we override
settings for the lightdm user in a pkla file. -->
<action id="com.ubuntu.AccountsService.GreeterChangeAny">
<defaults>
<allow_any>no</allow_any>
<allow_inactive>no</allow_inactive>
<allow_active>auth_admin_keep</allow_active>
</defaults>
</action>
<!-- Normally anyone can read these, but for a little bit extra lock down,
disallow all access, but we'll let the lightdm user read them via the
pkla override. -->
<action id="com.ubuntu.AccountsService.GreeterReadAny">
<defaults>
<allow_any>no</allow_any>
<allow_inactive>no</allow_inactive>
<allow_active>no</allow_active>
</defaults>
</action>
</policyconfig>
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