391 lines
14 KiB
Nix
391 lines
14 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.security.acme;
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certOpts = { name, ... }: {
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options = {
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webroot = mkOption {
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type = types.str;
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example = "/var/lib/acme/acme-challenges";
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description = ''
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Where the webroot of the HTTP vhost is located.
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<filename>.well-known/acme-challenge/</filename> directory
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will be created below the webroot if it doesn't exist.
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<literal>http://example.org/.well-known/acme-challenge/</literal> must also
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be available (notice unencrypted HTTP).
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'';
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};
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domain = mkOption {
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type = types.str;
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default = name;
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description = "Domain to fetch certificate for (defaults to the entry name)";
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};
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email = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Contact email address for the CA to be able to reach you.";
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};
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user = mkOption {
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type = types.str;
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default = "root";
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description = "User running the ACME client.";
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};
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group = mkOption {
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type = types.str;
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default = "root";
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description = "Group running the ACME client.";
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};
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allowKeysForGroup = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Give read permissions to the specified group
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(<option>security.acme.cert.<name>.group</option>) to read SSL private certificates.
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'';
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};
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postRun = mkOption {
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type = types.lines;
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default = "";
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example = "systemctl reload nginx.service";
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description = ''
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Commands to run after new certificates go live. Typically
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the web server and other servers using certificates need to
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be reloaded.
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Executed in the same directory with the new certificate.
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'';
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};
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plugins = mkOption {
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type = types.listOf (types.enum [
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"cert.der" "cert.pem" "chain.pem" "external.sh"
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"fullchain.pem" "full.pem" "key.der" "key.pem" "account_key.json"
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]);
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default = [ "fullchain.pem" "full.pem" "key.pem" "account_key.json" ];
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description = ''
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Plugins to enable. With default settings simp_le will
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store public certificate bundle in <filename>fullchain.pem</filename>,
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private key in <filename>key.pem</filename> and those two previous
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files combined in <filename>full.pem</filename> in its state directory.
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'';
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};
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activationDelay = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Systemd time span expression to delay copying new certificates to main
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state directory. See <citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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preDelay = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Commands to run after certificates are re-issued but before they are
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activated. Typically the new certificate is published to DNS.
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Executed in the same directory with the new certificate.
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'';
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};
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extraDomains = mkOption {
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type = types.attrsOf (types.nullOr types.str);
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default = {};
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example = literalExample ''
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{
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"example.org" = "/srv/http/nginx";
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"mydomain.org" = null;
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}
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'';
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description = ''
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A list of extra domain names, which are included in the one certificate to be issued, with their
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own server roots if needed.
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'';
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};
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};
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};
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in
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{
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###### interface
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options = {
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security.acme = {
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directory = mkOption {
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default = "/var/lib/acme";
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type = types.str;
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description = ''
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Directory where certs and other state will be stored by default.
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'';
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};
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validMin = mkOption {
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type = types.int;
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default = 30 * 24 * 3600;
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description = "Minimum remaining validity before renewal in seconds.";
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};
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renewInterval = mkOption {
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type = types.str;
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default = "weekly";
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description = ''
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Systemd calendar expression when to check for renewal. See
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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preliminarySelfsigned = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether a preliminary self-signed certificate should be generated before
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doing ACME requests. This can be useful when certificates are required in
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a webserver, but ACME needs the webserver to make its requests.
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With preliminary self-signed certificate the webserver can be started and
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can later reload the correct ACME certificates.
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'';
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};
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production = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set to true, use Let's Encrypt's production environment
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instead of the staging environment. The main benefit of the
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staging environment is to get much higher rate limits.
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See
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<literal>https://letsencrypt.org/docs/staging-environment</literal>
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for more detail.
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'';
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};
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certs = mkOption {
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default = { };
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type = with types; attrsOf (submodule certOpts);
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description = ''
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Attribute set of certificates to get signed and renewed.
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'';
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example = literalExample ''
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{
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"example.com" = {
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webroot = "/var/www/challenges/";
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email = "foo@example.com";
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extraDomains = { "www.example.com" = null; "foo.example.com" = "/var/www/foo/"; };
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};
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"bar.example.com" = {
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webroot = "/var/www/challenges/";
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email = "bar@example.com";
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};
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}
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'';
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};
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};
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};
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###### implementation
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config = mkMerge [
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(mkIf (cfg.certs != { }) {
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systemd.services = let
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services = concatLists servicesLists;
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servicesLists = mapAttrsToList certToServices cfg.certs;
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certToServices = cert: data:
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let
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cpath = lpath + optionalString (data.activationDelay != null) ".staging";
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lpath = "${cfg.directory}/${cert}";
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rights = if data.allowKeysForGroup then "750" else "700";
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cmdline = [ "-v" "-d" data.domain "--default_root" data.webroot "--valid_min" cfg.validMin ]
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++ optionals (data.email != null) [ "--email" data.email ]
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++ concatMap (p: [ "-f" p ]) data.plugins
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++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains)
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++ optionals (!cfg.production) ["--server" "https://acme-staging.api.letsencrypt.org/directory"];
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acmeService = {
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description = "Renew ACME Certificate for ${cert}";
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after = [ "network.target" "network-online.target" ];
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wants = [ "network-online.target" ];
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serviceConfig = {
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Type = "oneshot";
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SuccessExitStatus = [ "0" "1" ];
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PermissionsStartOnly = true;
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User = data.user;
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Group = data.group;
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PrivateTmp = true;
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};
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path = with pkgs; [ simp_le systemd ];
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preStart = ''
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mkdir -p '${cfg.directory}'
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chown 'root:root' '${cfg.directory}'
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chmod 755 '${cfg.directory}'
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if [ ! -d '${cpath}' ]; then
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mkdir '${cpath}'
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fi
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chmod ${rights} '${cpath}'
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chown -R '${data.user}:${data.group}' '${cpath}'
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mkdir -p '${data.webroot}/.well-known/acme-challenge'
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chown -R '${data.user}:${data.group}' '${data.webroot}/.well-known/acme-challenge'
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'';
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script = ''
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cd '${cpath}'
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set +e
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simp_le ${escapeShellArgs cmdline}
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EXITCODE=$?
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set -e
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echo "$EXITCODE" > /tmp/lastExitCode
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exit "$EXITCODE"
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'';
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postStop = ''
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cd '${cpath}'
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if [ -e /tmp/lastExitCode ] && [ "$(cat /tmp/lastExitCode)" = "0" ]; then
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${if data.activationDelay != null then ''
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${data.preDelay}
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if [ -d '${lpath}' ]; then
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systemd-run --no-block --on-active='${data.activationDelay}' --unit acme-setlive-${cert}.service
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else
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systemctl --wait start acme-setlive-${cert}.service
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fi
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'' else data.postRun}
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# noop ensuring that the "if" block is non-empty even if
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# activationDelay == null and postRun == ""
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true
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fi
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'';
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before = [ "acme-certificates.target" ];
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wantedBy = [ "acme-certificates.target" ];
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};
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delayService = {
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description = "Set certificate for ${cert} live";
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path = with pkgs; [ rsync ];
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serviceConfig = {
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Type = "oneshot";
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};
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script = ''
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rsync -a --delete-after '${cpath}/' '${lpath}'
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'';
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postStop = data.postRun;
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};
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selfsignedService = {
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description = "Create preliminary self-signed certificate for ${cert}";
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path = [ pkgs.openssl ];
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preStart = ''
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if [ ! -d '${cpath}' ]
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then
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mkdir -p '${cpath}'
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chmod ${rights} '${cpath}'
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chown '${data.user}:${data.group}' '${cpath}'
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fi
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'';
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script =
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''
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workdir="$(mktemp -d)"
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# Create CA
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openssl genrsa -des3 -passout pass:xxxx -out $workdir/ca.pass.key 2048
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openssl rsa -passin pass:xxxx -in $workdir/ca.pass.key -out $workdir/ca.key
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openssl req -new -key $workdir/ca.key -out $workdir/ca.csr \
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-subj "/C=UK/ST=Warwickshire/L=Leamington/O=OrgName/OU=Security Department/CN=example.com"
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openssl x509 -req -days 1 -in $workdir/ca.csr -signkey $workdir/ca.key -out $workdir/ca.crt
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# Create key
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openssl genrsa -des3 -passout pass:xxxx -out $workdir/server.pass.key 2048
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openssl rsa -passin pass:xxxx -in $workdir/server.pass.key -out $workdir/server.key
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openssl req -new -key $workdir/server.key -out $workdir/server.csr \
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-subj "/C=UK/ST=Warwickshire/L=Leamington/O=OrgName/OU=IT Department/CN=example.com"
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openssl x509 -req -days 1 -in $workdir/server.csr -CA $workdir/ca.crt \
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-CAkey $workdir/ca.key -CAserial $workdir/ca.srl -CAcreateserial \
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-out $workdir/server.crt
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# Copy key to destination
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cp $workdir/server.key ${cpath}/key.pem
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# Create fullchain.pem (same format as "simp_le ... -f fullchain.pem" creates)
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cat $workdir/{server.crt,ca.crt} > "${cpath}/fullchain.pem"
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# Create full.pem for e.g. lighttpd
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cat $workdir/{server.key,server.crt,ca.crt} > "${cpath}/full.pem"
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# Give key acme permissions
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chown '${data.user}:${data.group}' "${cpath}/"{key,fullchain,full}.pem
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chmod ${rights} "${cpath}/"{key,fullchain,full}.pem
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'';
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serviceConfig = {
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Type = "oneshot";
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PermissionsStartOnly = true;
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PrivateTmp = true;
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User = data.user;
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Group = data.group;
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};
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unitConfig = {
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# Do not create self-signed key when key already exists
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ConditionPathExists = "!${cpath}/key.pem";
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};
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before = [
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"acme-selfsigned-certificates.target"
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];
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wantedBy = [
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"acme-selfsigned-certificates.target"
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];
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};
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in (
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[ { name = "acme-${cert}"; value = acmeService; } ]
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++ optional cfg.preliminarySelfsigned { name = "acme-selfsigned-${cert}"; value = selfsignedService; }
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++ optional (data.activationDelay != null) { name = "acme-setlive-${cert}"; value = delayService; }
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);
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servicesAttr = listToAttrs services;
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injectServiceDep = {
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after = [ "acme-selfsigned-certificates.target" ];
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wants = [ "acme-selfsigned-certificates.target" "acme-certificates.target" ];
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};
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in
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servicesAttr //
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(if config.services.nginx.enable then { nginx = injectServiceDep; } else {}) //
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(if config.services.lighttpd.enable then { lighttpd = injectServiceDep; } else {});
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systemd.timers = flip mapAttrs' cfg.certs (cert: data: nameValuePair
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("acme-${cert}")
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({
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description = "Renew ACME Certificate for ${cert}";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = cfg.renewInterval;
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Unit = "acme-${cert}.service";
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Persistent = "yes";
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AccuracySec = "5m";
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RandomizedDelaySec = "1h";
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};
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})
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);
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systemd.targets."acme-selfsigned-certificates" = mkIf cfg.preliminarySelfsigned {};
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systemd.targets."acme-certificates" = {};
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})
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];
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meta = {
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maintainers = with lib.maintainers; [ abbradar fpletz globin ];
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doc = ./acme.xml;
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};
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}
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