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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.certmgr;
specs = mapAttrsToList (n: v: rec {
name = n + ".json";
path = if isAttrs v then pkgs.writeText name (builtins.toJSON v) else v;
}) cfg.specs;
allSpecs = pkgs.linkFarm "certmgr.d" specs;
certmgrYaml = pkgs.writeText "certmgr.yaml" (builtins.toJSON {
dir = allSpecs;
default_remote = cfg.defaultRemote;
svcmgr = cfg.svcManager;
before = cfg.validMin;
interval = cfg.renewInterval;
inherit (cfg) metricsPort metricsAddress;
});
specPaths = map dirOf (concatMap (spec:
if isAttrs spec then
collect isString (filterAttrsRecursive (n: v: isAttrs v || n == "path") spec)
else
[ spec ]
) (attrValues cfg.specs));
preStart = ''
${concatStringsSep " \\\n" (["mkdir -p"] ++ map escapeShellArg specPaths)}
${cfg.package}/bin/certmgr -f ${certmgrYaml} check
'';
in
{
options.services.certmgr = {
enable = mkEnableOption "certmgr";
package = mkOption {
type = types.package;
default = pkgs.certmgr;
defaultText = literalExpression "pkgs.certmgr";
description = "Which certmgr package to use in the service.";
};
defaultRemote = mkOption {
type = types.str;
default = "127.0.0.1:8888";
description = "The default CA host:port to use.";
};
validMin = mkOption {
default = "72h";
type = types.str;
description = "The interval before a certificate expires to start attempting to renew it.";
};
renewInterval = mkOption {
default = "30m";
type = types.str;
description = "How often to check certificate expirations and how often to update the cert_next_expires metric.";
};
metricsAddress = mkOption {
default = "127.0.0.1";
type = types.str;
description = "The address for the Prometheus HTTP endpoint.";
};
metricsPort = mkOption {
default = 9488;
type = types.ints.u16;
description = "The port for the Prometheus HTTP endpoint.";
};
specs = mkOption {
default = {};
example = literalExpression ''
{
exampleCert =
let
domain = "example.com";
secret = name: "/var/lib/secrets/''${name}.pem";
in {
service = "nginx";
action = "reload";
authority = {
file.path = secret "ca";
};
certificate = {
path = secret domain;
};
private_key = {
owner = "root";
group = "root";
mode = "0600";
path = secret "''${domain}-key";
};
request = {
CN = domain;
hosts = [ "mail.''${domain}" "www.''${domain}" ];
key = {
algo = "rsa";
size = 2048;
};
names = {
O = "Example Organization";
C = "USA";
};
};
};
otherCert = "/var/certmgr/specs/other-cert.json";
}
'';
type = with types; attrsOf (either path (submodule {
options = {
service = mkOption {
type = nullOr str;
default = null;
description = "The service on which to perform <action> after fetching.";
};
action = mkOption {
type = addCheck str (x: cfg.svcManager == "command" || elem x ["restart" "reload" "nop"]);
default = "nop";
description = "The action to take after fetching.";
};
# These ought all to be specified according to certmgr spec def.
authority = mkOption {
type = attrs;
description = "certmgr spec authority object.";
};
certificate = mkOption {
type = nullOr attrs;
description = "certmgr spec certificate object.";
};
private_key = mkOption {
type = nullOr attrs;
description = "certmgr spec private_key object.";
};
request = mkOption {
type = nullOr attrs;
description = "certmgr spec request object.";
};
};
}));
description = ''
Certificate specs as described by:
<link xlink:href="https://github.com/cloudflare/certmgr#certificate-specs" />
These will be added to the Nix store, so they will be world readable.
'';
};
svcManager = mkOption {
default = "systemd";
type = types.enum [ "circus" "command" "dummy" "openrc" "systemd" "sysv" ];
description = ''
This specifies the service manager to use for restarting or reloading services.
See: <link xlink:href="https://github.com/cloudflare/certmgr#certmgryaml" />.
For how to use the "command" service manager in particular,
see: <link xlink:href="https://github.com/cloudflare/certmgr#command-svcmgr-and-how-to-use-it" />.
'';
};
};
config = mkIf cfg.enable {
assertions = [
{
assertion = cfg.specs != {};
message = "Certmgr specs cannot be empty.";
}
{
assertion = !any (hasAttrByPath [ "authority" "auth_key" ]) (attrValues cfg.specs);
message = ''
Inline services.certmgr.specs are added to the Nix store rendering them world readable.
Specify paths as specs, if you want to use include auth_key - or use the auth_key_file option."
'';
}
];
systemd.services.certmgr = {
description = "certmgr";
path = mkIf (cfg.svcManager == "command") [ pkgs.bash ];
after = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
inherit preStart;
serviceConfig = {
Restart = "always";
RestartSec = "10s";
ExecStart = "${cfg.package}/bin/certmgr -f ${certmgrYaml}";
};
};
};
}
|