mirror of
https://github.com/ryantm/agenix.git
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252 lines
8.3 KiB
Nix
252 lines
8.3 KiB
Nix
{ config, options, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.age;
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# we need at least rage 0.5.0 to support ssh keys
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rage =
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if lib.versionOlder pkgs.rage.version "0.5.0"
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then pkgs.callPackage ../pkgs/rage.nix { }
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else pkgs.rage;
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ageBin = config.age.ageBin;
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users = config.users.users;
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identities = builtins.concatStringsSep " " (map (path: "-i ${path}") cfg.identityPaths);
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installSecret = secretType: ''
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${if secretType.symlink then ''
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_truePath="${cfg.secretsMountPoint}/$_agenix_generation/${secretType.name}"
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'' else ''
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_truePath="${secretType.path}"
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''}
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echo "decrypting '${secretType.file}' to '$_truePath'..."
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TMP_FILE="$_truePath.tmp"
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mkdir -p "$(dirname "$_truePath")"
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[ "${secretType.path}" != "/run/agenix/${secretType.name}" ] && mkdir -p "$(dirname "${secretType.path}")"
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(
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umask u=r,g=,o=
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LANG=${config.i18n.defaultLocale} ${ageBin} --decrypt ${identities} -o "$TMP_FILE" "${secretType.file}"
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)
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chmod ${secretType.mode} "$TMP_FILE"
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chown ${secretType.owner}:${secretType.group} "$TMP_FILE"
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mv -f "$TMP_FILE" "$_truePath"
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${optionalString secretType.symlink ''
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[ "${secretType.path}" != "/run/agenix/${secretType.name}" ] && ln -sfn "/run/agenix/${secretType.name}" "${secretType.path}"
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''}
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'';
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isRootSecret = st: (st.owner == "root" || st.owner == "0") && (st.group == "root" || st.group == "0");
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isNotRootSecret = st: !(isRootSecret st);
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rootOwnedSecrets = builtins.filter isRootSecret (builtins.attrValues cfg.secrets);
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installRootOwnedSecrets = builtins.concatStringsSep "\n" ([ "echo '[agenix] decrypting root secrets...'" ] ++ (map installSecret rootOwnedSecrets));
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nonRootSecrets = builtins.filter isNotRootSecret (builtins.attrValues cfg.secrets);
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installNonRootSecrets = builtins.concatStringsSep "\n" ([ "echo '[agenix] decrypting non-root secrets...'" ] ++ (map installSecret nonRootSecrets));
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secretType = types.submodule ({ config, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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default = config._module.args.name;
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description = ''
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Name of the file used in /run/agenix
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'';
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};
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file = mkOption {
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type = types.path;
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description = ''
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Age file the secret is loaded from.
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'';
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};
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path = mkOption {
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type = types.str;
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default = "/run/agenix/${config.name}";
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description = ''
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Path where the decrypted secret is installed.
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'';
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};
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mode = mkOption {
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type = types.str;
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default = "0400";
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description = ''
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Permissions mode of the decrypted secret in a format understood by chmod.
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'';
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};
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owner = mkOption {
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type = types.str;
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default = "0";
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description = ''
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User of the decrypted secret.
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'';
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};
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group = mkOption {
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type = types.str;
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default = users.${config.owner}.group or "0";
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description = ''
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Group of the decrypted secret.
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'';
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};
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action = mkOption {
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type = types.str;
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default = "";
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description = "A script to run when secret is updated.";
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};
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service = mkOption {
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type = types.str;
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default = "";
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description = "The systemd service that uses this secret. Will be restarted when the secret changes.";
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example = "wireguard-wg0";
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};
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symlink = mkEnableOption "symlinking secrets to their destination" // { default = true; };
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};
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});
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in
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{
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imports = [
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(mkRenamedOptionModule [ "age" "sshKeyPaths" ] [ "age" "identityPaths" ])
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];
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options.age = {
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ageBin = mkOption {
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type = types.str;
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default = "${rage}/bin/rage";
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description = ''
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The age executable to use.
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'';
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};
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secrets = mkOption {
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type = types.attrsOf secretType;
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default = { };
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description = ''
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Attrset of secrets.
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'';
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};
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secretsMountPoint = mkOption {
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type = types.addCheck types.str
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(s:
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(builtins.match "[ \t\n]*" s) == null # non-empty
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&& (builtins.match ".+/" s) == null) # without trailing slash
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// { description = "${types.str.description} (with check: non-empty without trailing slash)"; };
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default = "/run/agenix.d";
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description = ''
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Where secrets are created before they are symlinked to /run/agenix
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'';
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};
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identityPaths = mkOption {
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type = types.listOf types.path;
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default =
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if config.services.openssh.enable then
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map (e: e.path) (lib.filter (e: e.type == "rsa" || e.type == "ed25519") config.services.openssh.hostKeys)
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else [ ];
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description = ''
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Path to SSH keys to be used as identities in age decryption.
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'';
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};
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};
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config = mkIf (cfg.secrets != { }) {
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assertions = [{
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assertion = cfg.identityPaths != [ ];
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message = "age.identityPaths must be set.";
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}];
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# Create a new directory full of secrets for symlinking (this helps
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# ensure removed secrets are actually removed, or at least become
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# invalid symlinks).
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system.activationScripts.agenixMountSecrets = {
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text = ''
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_agenix_generation="$(basename "$(readlink /run/agenix)" || echo 0)"
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(( ++_agenix_generation ))
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echo "[agenix] symlinking new secrets to /run/agenix (generation $_agenix_generation)..."
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mkdir -p "${cfg.secretsMountPoint}"
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chmod 0751 "${cfg.secretsMountPoint}"
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grep -q "${cfg.secretsMountPoint} ramfs" /proc/mounts || mount -t ramfs none "${cfg.secretsMountPoint}" -o nodev,nosuid,mode=0751
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mkdir -p "${cfg.secretsMountPoint}/$_agenix_generation"
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chmod 0751 "${cfg.secretsMountPoint}/$_agenix_generation"
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ln -sfn "${cfg.secretsMountPoint}/$_agenix_generation" /run/agenix
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(( _agenix_generation > 1 )) && {
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echo "[agenix] removing old secrets (generation $(( _agenix_generation - 1 )))..."
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rm -rf "${cfg.secretsMountPoint}/$(( _agenix_generation - 1 ))"
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}
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'';
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deps = [
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"specialfs"
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];
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};
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# Secrets with root owner and group can be installed before users
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# exist. This allows user password files to be encrypted.
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system.activationScripts.agenixRoot = {
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text = installRootOwnedSecrets;
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deps = [ "agenixMountSecrets" "specialfs" ];
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};
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system.activationScripts.users.deps = [ "agenixRoot" ];
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# chown the secrets mountpoint and the current generation to the keys group
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# instead of leaving it root:root.
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system.activationScripts.agenixChownKeys = {
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text = ''
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chown :keys "${cfg.secretsMountPoint}" "${cfg.secretsMountPoint}/$_agenix_generation"
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'';
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deps = [
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"users"
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"groups"
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"agenixMountSecrets"
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];
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};
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# Other secrets need to wait for users and groups to exist.
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system.activationScripts.agenix = {
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text = installNonRootSecrets;
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deps = [
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"users"
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"groups"
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"specialfs"
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"agenixMountSecrets"
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"agenixChownKeys"
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];
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};
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# services that watch for file changes and exectue the configured action
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systemd.services = lib.mkMerge
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(lib.mapAttrsToList
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(name: {action, service, file, path, mode, owner, group, ...}:
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let
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fileHash = builtins.hashFile "sha256" file;
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restartTriggers = [ fileHash path mode owner group ];
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in
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lib.mkMerge [
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(lib.mkIf (service != "") {
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${service} = { inherit restartTriggers; };
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})
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(lib.mkIf (action != "") {
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"agenix-${name}-action" = {
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inherit restartTriggers;
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# We execute the action on reload so that it doesn't happen at
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# startup. The only disadvantage is that it won't trigger the
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# first time the service is created.
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reload = action;
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reloadIfChanged = true;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = " "; # systemd complains if we only set ExecReload
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# Give it a reason for starting
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wantedBy = [ "multi-user.target" ];
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};
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})]) cfg.secrets);
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};
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}
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