[systemd-devel] hostnamectl set-hostname non-admin user

[Damien LEFEVRE]

Hi,

I have an embedded device and I do not install sudo. I need to have a
non-root running the main service capable of changing the hostname.

After spending a long afternoon on this I still have not managed.

Here i've tried adding my new user but only read-only requests go through
/usr/share/dbus-1/system.d/org.freedesktop.hostname1.conf
```xml
<?xml version="1.0"?> <!--*-nxml-*-->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration
1.0//EN"
        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">

<!--
  SPDX-License-Identifier: LGPL-2.1+

  This file is part of systemd.

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.
-->

<busconfig>

    <policy user="root">
        <allow own="org.freedesktop.hostname1"/>
        <allow send_destination="org.freedesktop.hostname1"/>
        <allow receive_sender="org.freedesktop.hostname1"/>
    </policy>

    <policy user="myuser">
        <!--<allow own="org.freedesktop.hostname1"/>-->
        <allow send_destination="org.freedesktop.hostname1"/>
        <allow receive_sender="org.freedesktop.hostname1"/>
    </policy>

    <policy context="default">
        <allow send_destination="org.freedesktop.hostname1"/>
        <allow receive_sender="org.freedesktop.hostname1"/>
    </policy>

</busconfig>
```


/usr/share/polkit-1/actions/org.freedesktop.hostname1.policy
```xml
<?xml version="1.0" encoding="UTF-8"?> <!--*-nxml-*-->
<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy
Configuration 1.0//EN"
        "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">

<!--
  SPDX-License-Identifier: LGPL-2.1+

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.
-->

<policyconfig>

        <vendor>The systemd Project</vendor>
        <vendor_url>http://www.freedesktop.org/wiki/Software/systemd
</vendor_url>

        <action id="org.freedesktop.hostname1.set-hostname">
                <description gettext-domain="systemd">Set host
name</description>
                <message gettext-domain="systemd">Authentication is
required to set the local host name.</message>
                <defaults>
                        <allow_any>auth_admin_keep</allow_any>
                        <allow_inactive>auth_admin_keep</allow_inactive>
                        <allow_active>auth_admin_keep</allow_active>
                </defaults>
        </action>

        <action id="org.freedesktop.hostname1.set-static-hostname">
                <description gettext-domain="systemd">Set static host
name</description>
                <message gettext-domain="systemd">Authentication is
required to set the statically configured local host name, as well as the
pretty host name.</message>
                <defaults>
                        <allow_any>auth_admin_keep</allow_any>
                        <allow_inactive>auth_admin_keep</allow_inactive>
                        <allow_active>auth_admin_keep</allow_active>
                </defaults>
                <annotate
key="org.freedesktop.policykit.imply">org.freedesktop.hostname1.set-hostname
org.freedesktop.hostname1.set-machine-info</annotate>
        </action>

        <action id="org.freedesktop.hostname1.set-machine-info">
                <description gettext-domain="systemd">Set machine
information</description>
                <message gettext-domain="systemd">Authentication is
required to set local machine information.</message>
                <defaults>
                        <allow_any>auth_admin_keep</allow_any>
                        <allow_inactive>auth_admin_keep</allow_inactive>
                        <allow_active>auth_admin_keep</allow_active>
                </defaults>
        </action>

        <action id="org.freedesktop.hostname1.get-product-uuid">
                <description gettext-domain="systemd">Get product
UUID</description>
                <message gettext-domain="systemd">Authentication is
required to get product UUID.</message>
                <defaults>
                        <allow_any>auth_admin_keep</allow_any>
                        <allow_inactive>auth_admin_keep</allow_inactive>
                        <allow_active>auth_admin_keep</allow_active>
                </defaults>
        </action>

</policyconfig>
```

Despite all my attempts I always get 'Could not set property: Access
denied' for hostnamectl set-hostname

And get the 'org.freedesktop.DBus.Error.AccessDenied' in dbus-monitor

method call time=1617739342.317948 sender=:1.23 ->
destination=org.freedesktop.hostname1 serial=3
path=/org/freedesktop/hostname1; interface=org.freedesktop.hostname1;
member=SetStaticHostname
   string "blabla"
   boolean true
...
error time=1617739342.320289 sender=:1.24 -> destination=:1.23
error_name=org.freedesktop.DBus.Error.AccessDenied reply_serial=3
   string "Permission denied"


Any help would be greatly appreciated =)

-Damien
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