nixpkgs/nixos/modules/services/networking/prosody.xml

<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-prosody">
 <title>Prosody</title>
 <para>
  <link xlink:href="https://prosody.im/">Prosody</link> is an open-source, modern XMPP server.
 </para>
 <section xml:id="module-services-prosody-basic-usage">
  <title>Basic usage</title>

  <para>
    A common struggle for most XMPP newcomers is to find the right set
    of XMPP Extensions (XEPs) to setup. Forget to activate a few of
    those and your XMPP experience might turn into a nightmare!
  </para>

  <para>
    The XMPP community tackles this problem by creating a meta-XEP
    listing a decent set of XEPs you should implement. This meta-XEP
    is issued every year, the 2020 edition being
    <link xlink:href="https://xmpp.org/extensions/xep-0423.html">XEP-0423</link>.
  </para>
  <para>
    The NixOS Prosody module will implement most of these recommendend XEPs out of
    the box. That being said, two components still require some
    manual configuration: the
    <link xlink:href="https://xmpp.org/extensions/xep-0045.html">Multi User Chat (MUC)</link>
    and the <link xlink:href="https://xmpp.org/extensions/xep-0363.html">HTTP File Upload</link> ones.
    You'll need to create a DNS subdomain for each of those. The current convention is to name your
    MUC endpoint <literal>conference.example.org</literal> and your HTTP upload domain <literal>upload.example.org</literal>.
  </para>
  <para>
    A good configuration to start with, including a
    <link xlink:href="https://xmpp.org/extensions/xep-0045.html">Multi User Chat (MUC)</link>
    endpoint as well as a <link xlink:href="https://xmpp.org/extensions/xep-0363.html">HTTP File Upload</link>
    endpoint will look like this:
    <programlisting>
services.prosody = {
  <link linkend="opt-services.prosody.enable">enable</link> = true;
  <link linkend="opt-services.prosody.admins">admins</link> = [ "root@example.org" ];
  <link linkend="opt-services.prosody.ssl.cert">ssl.cert</link> = "/var/lib/acme/example.org/fullchain.pem";
  <link linkend="opt-services.prosody.ssl.key">ssl.key</link> = "/var/lib/acme/example.org/key.pem";
  <link linkend="opt-services.prosody.virtualHosts">virtualHosts</link>."example.org" = {
      <link linkend="opt-services.prosody.virtualHosts._name_.enabled">enabled</link> = true;
      <link linkend="opt-services.prosody.virtualHosts._name_.domain">domain</link> = "example.org";
      <link linkend="opt-services.prosody.virtualHosts._name_.ssl.cert">ssl.cert</link> = "/var/lib/acme/example.org/fullchain.pem";
      <link linkend="opt-services.prosody.virtualHosts._name_.ssl.key">ssl.key</link> = "/var/lib/acme/example.org/key.pem";
  };
  <link linkend="opt-services.prosody.muc">muc</link> = [ {
      <link linkend="opt-services.prosody.muc">domain</link> = "conference.example.org";
  } ];
  <link linkend="opt-services.prosody.uploadHttp">uploadHttp</link> = {
      <link linkend="opt-services.prosody.uploadHttp.domain">domain</link> = "upload.example.org";
  };
};</programlisting>
  </para>
 </section>
 <section xml:id="module-services-prosody-letsencrypt">
  <title>Let's Encrypt Configuration</title>
 <para>
   As you can see in the code snippet from the
   <link linkend="module-services-prosody-basic-usage">previous section</link>,
   you'll need a single TLS certificate covering your main endpoint,
   the MUC one as well as the HTTP Upload one. We can generate such a
   certificate by leveraging the ACME
   <link linkend="opt-security.acme.certs._name_.extraDomainNames">extraDomainNames</link> module option.
 </para>
 <para>
   Provided the setup detailed in the previous section, you'll need the following acme configuration to generate
   a TLS certificate for the three endponits:
    <programlisting>
security.acme = {
  <link linkend="opt-security.acme.email">email</link> = "root@example.org";
  <link linkend="opt-security.acme.acceptTerms">acceptTerms</link> = true;
  <link linkend="opt-security.acme.certs">certs</link> = {
    "example.org" = {
      <link linkend="opt-security.acme.certs._name_.webroot">webroot</link> = "/var/www/example.org";
      <link linkend="opt-security.acme.certs._name_.email">email</link> = "root@example.org";
      <link linkend="opt-security.acme.certs._name_.extraDomainNames">extraDomainNames</link> = [ "conference.example.org" "upload.example.org" ];
    };
  };
};</programlisting>
 </para>
</section>
</chapter>