{ description = "Secrets handling"; outputs = { self }: { nixosModule = { config, lib, pkgs, ... }: { # Necessary for situations where flake gets included multiple times key = builtins.hashString "sha256" (builtins.path { path = self.sourceInfo.outPath; name = "source"; }); options.secrets = with lib; { keys = mkOption { type = types.attrsOf (types.submodule { options = { isTemplated = mkOption { type = types.bool; default = true; description = "If the file is a gucci template that needs to be resolved"; }; isDir = mkOption { type = types.bool; default = false; description = "If the entry is a directory"; }; group = mkOption { type = types.str; default = "root"; description = "Group to associate to the entry"; }; user = mkOption { type = types.str; default = "root"; description = "User to associate to the entry"; }; permissions = mkOption { type = types.str; default = "0600"; description = "Permissions to associate to the entry"; }; text = mkOption { type = types.str; description = "Content of the entry"; }; keyDependencies = mkOption { default = []; type = types.listOf (types.either types.path types.package); description = '' (public) system dependencies that needs to be uploaded with the key. keyDependencies + ignoredKeyDependencies should contain the exhaustive list of the text context. A warning will be thrown if there are remaning dependencies from the text. ''; }; ignoredKeyDependencies = mkOption { default = []; type = types.listOf (types.either types.path types.package); description = '' dependencies that must not be sent along with the key. keyDependencies + ignoredKeyDependencies should contain the exhaustive list of the text context. A warning will be thrown if there are remaning dependencies from the text. ''; }; }; }); default = {}; description = "Keys attrs to upload to the server"; apply = builtins.mapAttrs (dest: v: v // { inherit dest; }); }; gpgKeys = mkOption { type = types.listOf types.path; default = []; description = "GPG public keys files to encrypt to"; }; ageKeys = mkOption { type = types.listOf types.str; default = []; description = "AGE keys to encrypt to"; }; decryptKey = mkOption { type = types.str; default = "/etc/ssh/ssh_host_ed25519_key"; description = "ed25519 key used to decrypt with AGE"; }; location = mkOption { type = types.path; default = "/var/secrets"; description = "Location where to put the keys"; }; secretsVars = mkOption { type = types.path; description = "Location where the secrets variables are defined, to be used to fill the templates in secrets"; }; deleteSecretsVars = mkOption { type = types.bool; default = false; description = "Delete secrets file after deployment"; }; # Read-only variables fullPaths = mkOption { type = types.attrsOf types.path; default = builtins.mapAttrs (n: v: "${config.secrets.location}/${n}") config.secrets.keys; readOnly = true; description = "set of full paths to secrets"; }; }; config = let location = config.secrets.location; keys = builtins.attrValues config.secrets.keys; empty = pkgs.runCommand "empty" { preferLocalBuild = true; } "mkdir -p $out && touch $out/done"; fpath = v: "secrets/${v.dest}${lib.optionalString v.isTemplated ".gucci.tpl"}"; dumpKey = v: if v.isDir then '' mkdir -p secrets/${v.dest} cat >> mods < ${fpath v} cat >> mods </dev/null fingerprints=$fingerprints,$(cat $key | gpg --with-colons --import-options show-only --import 2>/dev/null | grep ^fpr | cut -d: -f10 | head -n1) done sops --age ${builtins.concatStringsSep "," config.secrets.ageKeys} --pgp ''${fingerprints#,} --input-type binary -i -e $out 2>/dev/null ''; pathChmodExcl = let dirs = builtins.filter (v: v.isDir) keys; exclPath = builtins.concatStringsSep " -o " (map (d: " -path $TMP/${d.dest}") dirs); in lib.optionalString (builtins.length dirs > 0) " -not \\( ${exclPath} \\) "; checkKeyDependencies = key: let allDeps = builtins.map (n: if builtins.isPath n then "${n}" else n.drvPath) (key.keyDependencies ++ key.ignoredKeyDependencies); context = builtins.attrNames (builtins.getContext key.text); missing = builtins.foldl' (o: n: lib.remove n o) context allDeps; in lib.optional (!key.isDir && builtins.length missing > 0) '' Key ${key.dest} has non declared dependencies in its context: ${builtins.concatStringsSep " " missing} Add them to ignoredKeyDependencies to ignore ''; in lib.mkIf (builtins.length keys > 0) { warnings = lib.concatMap checkKeyDependencies keys; # FIXME: Use lib.concatMap (k: k.keyDependencies) keys in latest nixpkgs system.extraDependencies = lib.concatMap (k: builtins.map (dep: if builtins.isPath dep then pkgs.writeText "extra-dep" "${dep}" else dep ) k.keyDependencies) keys; system.activationScripts.secrets = { deps = [ "users" "wrappers" ]; text = '' install -m0750 -o root -g keys -d ${location} TMP=$(${pkgs.coreutils}/bin/mktemp -d) TMPWORK=$(${pkgs.coreutils}/bin/mktemp -d) chmod go-rwx $TMPWORK if [ -n "$TMP" -a -n "$TMPWORK" -a -f ${config.secrets.secretsVars} ]; then install -m0750 -o root -g keys -d $TMP ${pkgs.ssh-to-age}/bin/ssh-to-age -private-key -i ${config.secrets.decryptKey} -o $TMPWORK/keys.txt SOPS_AGE_KEY_FILE=$TMPWORK/keys.txt ${pkgs.sops}/bin/sops -d ${secrets} | ${pkgs.gnutar}/bin/tar --strip-components 1 -C $TMP -x SOPS_AGE_KEY_FILE=$TMPWORK/keys.txt ${pkgs.sops}/bin/sops -d ${config.secrets.secretsVars} > $TMPWORK/vars.yml if [ -f $TMPWORK/vars.yml ]; then find $TMP -name "*.gucci.tpl" -exec \ /bin/sh -c 'f="{}"; ${pkgs.gucci}/bin/gucci -f '$TMPWORK'/vars.yml "$f" > "''${f%.gucci.tpl}"; touch --reference "$f" ''${f%.gucci.tpl} ; chmod --reference="$f" ''${f%.gucci.tpl} ; chown --reference="$f" ''${f%.gucci.tpl}' \; fi find $TMP -type d ${pathChmodExcl}-exec chown root:keys {} \; -exec chmod o-rx {} \; ${pkgs.rsync}/bin/rsync --exclude="*.gucci.tpl" -O -c -av --delete $TMP/ ${location} rm -rf $TMP $TMPWORK ${lib.optionalString config.secrets.deleteSecretsVars config.secrets.secretsVars} fi ''; }; }; }; }; }