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https://github.com/NixOS/nixpkgs.git
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337 lines
13 KiB
Nix
337 lines
13 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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server = 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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ACME Directory Resource URI. Defaults to let's encrypt
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production endpoint,
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https://acme-v02.api.letsencrypt.org/directory, if unset.
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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" "account_reg.json"
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]);
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default = [ "fullchain.pem" "full.pem" "key.pem" "account_key.json" "account_reg.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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directory = mkOption {
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type = types.str;
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readOnly = true;
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default = "/var/lib/acme/${name}";
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description = "Directory where certificate and other state is stored.";
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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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imports = [
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(mkRemovedOptionModule [ "security" "acme" "production" ] ''
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Use security.acme.server to define your staging ACME server URL instead.
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To use the let's encrypt staging server, use security.acme.server =
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"https://acme-staging-v02.api.letsencrypt.org/directory".
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''
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)
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];
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options = {
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security.acme = {
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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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server = 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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ACME Directory Resource URI. Defaults to let's encrypt
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production endpoint,
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<literal>https://acme-v02.api.letsencrypt.org/directory</literal>, if unset.
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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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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. Creates
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<literal>acme-''${cert}.{service,timer}</literal> systemd units for
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each certificate defined here. Other services can add dependencies
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to those units if they rely on the certificates being present,
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or trigger restarts of the service if certificates get 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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lpath = "acme/${cert}";
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rights = if data.allowKeysForGroup then "750" else "700";
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cmdline = [ "-v" "-d" data.domain "--default_root" data.webroot "--valid_min" cfg.validMin ]
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++ optionals (data.email != null) [ "--email" data.email ]
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++ concatMap (p: [ "-f" p ]) data.plugins
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++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains)
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++ optionals (cfg.server != null || data.server != null) ["--server" (if data.server == null then cfg.server else data.server)];
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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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# simp_le uses requests, which uses certifi under the hood,
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# which doesn't respect the system trust store.
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# At least in the acme test, we provision a fake CA, impersonating the LE endpoint.
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# REQUESTS_CA_BUNDLE is a way to teach python requests to use something else
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environment.REQUESTS_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt";
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serviceConfig = {
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Type = "oneshot";
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# With RemainAfterExit the service is considered active even
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# after the main process having exited, which means when it
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# gets changed, the activation phase restarts it, meaning
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# the permissions of the StateDirectory get adjusted
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# according to the specified group
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RemainAfterExit = true;
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SuccessExitStatus = [ "0" "1" ];
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User = data.user;
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Group = data.group;
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PrivateTmp = true;
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StateDirectory = lpath;
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StateDirectoryMode = rights;
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WorkingDirectory = "/var/lib/${lpath}";
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ExecStart = "${pkgs.simp_le}/bin/simp_le ${escapeShellArgs cmdline}";
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ExecStopPost =
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let
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script = pkgs.writeScript "acme-post-stop" ''
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#!${pkgs.runtimeShell} -e
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${data.postRun}
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'';
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in
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"+${script}";
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};
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};
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selfsignedService = {
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description = "Create preliminary self-signed certificate for ${cert}";
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path = [ pkgs.openssl ];
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script =
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''
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workdir="$(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 $workdir/server.key /var/lib/${lpath}/key.pem
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# Create fullchain.pem (same format as "simp_le ... -f fullchain.pem" creates)
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cat $workdir/{server.crt,ca.crt} > "/var/lib/${lpath}/fullchain.pem"
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# Create full.pem for e.g. lighttpd
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cat $workdir/{server.key,server.crt,ca.crt} > "/var/lib/${lpath}/full.pem"
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# Give key acme permissions
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chown '${data.user}:${data.group}' "/var/lib/${lpath}/"{key,fullchain,full}.pem
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chmod ${rights} "/var/lib/${lpath}/"{key,fullchain,full}.pem
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'';
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serviceConfig = {
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Type = "oneshot";
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PrivateTmp = true;
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StateDirectory = lpath;
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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 = "!/var/lib/${lpath}/key.pem";
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};
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};
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in (
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[ { name = "acme-${cert}"; value = acmeService; } ]
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++ optional cfg.preliminarySelfsigned { name = "acme-selfsigned-${cert}"; value = selfsignedService; }
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);
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servicesAttr = listToAttrs services;
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in
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servicesAttr;
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systemd.tmpfiles.rules =
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flip mapAttrsToList cfg.certs
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(cert: data: "d ${data.webroot}/.well-known/acme-challenge - ${data.user} ${data.group}");
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systemd.timers = flip mapAttrs' cfg.certs (cert: data: nameValuePair
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("acme-${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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