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5532065d06
Previously setting `allowKeysForGroup = true; group = "foo"` would not apply the group permission change of the certificates until the service gets restarted. This commit fixes this by making systemd restart the service every time it changes. Note that applying this commit to a system with an already running acme systemd service doesn't fix this immediately and you still need to wait for the next refresh (or call `systemctl restart acme-<domain>`). Once everybody's service has restarted once this should be a problem of the past.
324 lines
12 KiB
Nix
324 lines
12 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" "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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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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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. 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.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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# 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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