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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="module-services-mjolnir">
<title>Mjolnir (Matrix Moderation Tool)</title>
<para>
This chapter will show you how to set up your own, self-hosted
<link xlink:href="https://github.com/matrix-org/mjolnir">Mjolnir</link>
instance.
</para>
<para>
As an all-in-one moderation tool, it can protect your server from
malicious invites, spam messages, and whatever else you don't want.
In addition to server-level protection, Mjolnir is great for communities
wanting to protect their rooms without having to use their personal
accounts for moderation.
</para>
<para>
The bot by default includes support for bans, redactions, anti-spam,
server ACLs, room directory changes, room alias transfers, account
deactivation, room shutdown, and more.
</para>
<para>
See the <link xlink:href="https://github.com/matrix-org/mjolnir#readme">README</link>
page and the <link xlink:href="https://github.com/matrix-org/mjolnir/blob/main/docs/moderators.md">Moderator's guide</link>
for additional instructions on how to setup and use Mjolnir.
</para>
<para>
For <link linkend="opt-services.mjolnir.settings">additional settings</link>
see <link xlink:href="https://github.com/matrix-org/mjolnir/blob/main/config/default.yaml">the default configuration</link>.
</para>
<section xml:id="module-services-mjolnir-setup">
<title>Mjolnir Setup</title>
<para>
First create a new Room which will be used as a management room for Mjolnir. In
this room, Mjolnir will log possible errors and debugging information. You'll
need to set this Room-ID in <link linkend="opt-services.mjolnir.managementRoom">services.mjolnir.managementRoom</link>.
</para>
<para>
Next, create a new user for Mjolnir on your homeserver, if not present already.
</para>
<para>
The Mjolnir Matrix user expects to be free of any rate limiting.
See <link xlink:href="https://github.com/matrix-org/synapse/issues/6286">Synapse #6286</link>
for an example on how to achieve this.
</para>
<para>
If you want Mjolnir to be able to deactivate users, move room aliases, shutdown rooms, etc.
you'll need to make the Mjolnir user a Matrix server admin.
</para>
<para>
Now invite the Mjolnir user to the management room.
</para>
<para>
It is recommended to use <link xlink:href="https://github.com/matrix-org/pantalaimon">Pantalaimon</link>,
so your management room can be encrypted. This also applies if you are looking to moderate an encrypted room.
</para>
<para>
To enable the Pantalaimon E2E Proxy for mjolnir, enable
<link linkend="opt-services.mjolnir.pantalaimon.enable">services.mjolnir.pantalaimon</link>. This will
autoconfigure a new Pantalaimon instance, which will connect to the homeserver
set in <link linkend="opt-services.mjolnir.homeserverUrl">services.mjolnir.homeserverUrl</link> and Mjolnir itself
will be configured to connect to the new Pantalaimon instance.
</para>
<programlisting>
{
services.mjolnir = {
enable = true;
<link linkend="opt-services.mjolnir.homeserverUrl">homeserverUrl</link> = "https://matrix.domain.tld";
<link linkend="opt-services.mjolnir.pantalaimon">pantalaimon</link> = {
<link linkend="opt-services.mjolnir.pantalaimon.enable">enable</link> = true;
<link linkend="opt-services.mjolnir.pantalaimon.username">username</link> = "mjolnir";
<link linkend="opt-services.mjolnir.pantalaimon.passwordFile">passwordFile</link> = "/run/secrets/mjolnir-password";
};
<link linkend="opt-services.mjolnir.protectedRooms">protectedRooms</link> = [
"https://matrix.to/#/!xxx:domain.tld"
];
<link linkend="opt-services.mjolnir.managementRoom">managementRoom</link> = "!yyy:domain.tld";
};
}
</programlisting>
<section xml:id="module-services-mjolnir-setup-ems">
<title>Element Matrix Services (EMS)</title>
<para>
If you are using a managed <link xlink:href="https://ems.element.io/">"Element Matrix Services (EMS)"</link>
server, you will need to consent to the terms and conditions. Upon startup, an error
log entry with a URL to the consent page will be generated.
</para>
</section>
</section>
<section xml:id="module-services-mjolnir-matrix-synapse-antispam">
<title>Synapse Antispam Module</title>
<para>
A Synapse module is also available to apply the same rulesets the bot
uses across an entire homeserver.
</para>
<para>
To use the Antispam Module, add <package>matrix-synapse-plugins.matrix-synapse-mjolnir-antispam</package>
to the Synapse plugin list and enable the <literal>mjolnir.Module</literal> module.
</para>
<programlisting>
{
services.matrix-synapse = {
plugins = with pkgs; [
matrix-synapse-plugins.matrix-synapse-mjolnir-antispam
];
extraConfig = ''
modules:
- module: mjolnir.Module
config:
# Prevent servers/users in the ban lists from inviting users on this
# server to rooms. Default true.
block_invites: true
# Flag messages sent by servers/users in the ban lists as spam. Currently
# this means that spammy messages will appear as empty to users. Default
# false.
block_messages: false
# Remove users from the user directory search by filtering matrix IDs and
# display names by the entries in the user ban list. Default false.
block_usernames: false
# The room IDs of the ban lists to honour. Unlike other parts of Mjolnir,
# this list cannot be room aliases or permalinks. This server is expected
# to already be joined to the room - Mjolnir will not automatically join
# these rooms.
ban_lists:
- "!roomid:example.org"
'';
};
}
</programlisting>
</section>
</chapter>
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