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94 lines
3.2 KiB
XML
94 lines
3.2 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="module-security-acme">
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<title>SSL/TLS Certificates with ACME</title>
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<para>NixOS supports automatic domain validation & certificate
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retrieval and renewal using the ACME protocol. This is currently only
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implemented by and for Let's Encrypt. The alternative ACME client
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<literal>simp_le</literal> is used under the hood.</para>
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<section><title>Prerequisites</title>
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<para>You need to have a running HTTP server for verification. The server must
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have a webroot defined that can serve
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<filename>.well-known/acme-challenge</filename>. This directory must be
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writeable by the user that will run the ACME client.</para>
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<para>For instance, this generic snippet could be used for Nginx:
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<programlisting>
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http {
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server {
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server_name _;
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listen 80;
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listen [::]:80;
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location /.well-known/acme-challenge {
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root /var/www/challenges;
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}
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location / {
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return 301 https://$host$request_uri;
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}
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}
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}
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</programlisting>
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</para>
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</section>
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<section><title>Configuring</title>
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<para>To enable ACME certificate retrieval & renewal for a certificate for
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<literal>foo.example.com</literal>, add the following in your
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<filename>configuration.nix</filename>:
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<programlisting>
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<xref linkend="opt-security.acme.certs"/>."foo.example.com" = {
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<link linkend="opt-security.acme.certs._name_.webroot">webroot</link> = "/var/www/challenges";
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<link linkend="opt-security.acme.certs._name_.email">email</link> = "foo@example.com";
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};
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</programlisting>
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</para>
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<para>The private key <filename>key.pem</filename> and certificate
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<filename>fullchain.pem</filename> will be put into
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<filename>/var/lib/acme/foo.example.com</filename>. The target directory can
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be configured with the option <xref linkend="opt-security.acme.directory"/>.
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</para>
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<para>Refer to <xref linkend="ch-options" /> for all available configuration
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options for the <link linkend="opt-security.acme.certs">security.acme</link> module.</para>
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</section>
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<section><title>Using ACME certificates in Nginx</title>
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<para>NixOS supports fetching ACME certificates for you by setting
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<literal><link linkend="opt-services.nginx.virtualHosts._name_.enableACME">enableACME</link> = true;</literal> in a virtualHost config. We
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first create self-signed placeholder certificates in place of the
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real ACME certs. The placeholder certs are overwritten when the ACME
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certs arrive. For <literal>foo.example.com</literal> the config would
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look like.
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</para>
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<programlisting>
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services.nginx = {
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<link linkend="opt-services.nginx.enable">enable = true;</link>
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<link linkend="opt-services.nginx.virtualHosts">virtualHosts</link> = {
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"foo.example.com" = {
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<link linkend="opt-services.nginx.virtualHosts._name_.forceSSL">forceSSL</link> = true;
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<link linkend="opt-services.nginx.virtualHosts._name_.enableACME">enableACME</link> = true;
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locations."/" = {
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<link linkend="opt-services.nginx.virtualHosts._name_.locations._name_.root">root</link> = "/var/www";
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};
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};
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};
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}
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</programlisting>
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</section>
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</chapter>
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