+{
+ description = "Secrets handling";
+
+ outputs = { self }: {
+ nixosModule = { config, lib, pkgs, ... }: {
+ options.secrets = with lib; {
+ keys = mkOption {
+ type = types.listOf types.unspecified;
+ default = [];
+ description = "Keys to upload to server";
+ };
+ 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.listToAttrs
+ (map (v: { name = v.dest; value = "${config.secrets.location}/${v.dest}"; }) config.secrets.keys);
+ readOnly = true;
+ description = "set of full paths to secrets";
+ };
+ };
+
+ config = let
+ location = config.secrets.location;
+ keys = config.secrets.keys;
+ empty = pkgs.runCommand "empty" { preferLocalBuild = true; } "mkdir -p $out && touch $out/done";
+ fpath = v: "secrets/${v.dest}${lib.optionalString (v.isTemplated or true) ".gucci.tpl"}";
+ dumpKey = v:
+ if v.isDir or false then
+ ''
+ mkdir -p secrets/${v.dest}
+ cat >> mods <<EOF
+ ${v.user or "root"} ${v.group or "root"} ${v.permissions or "0600"} secrets/${v.dest}
+ EOF
+ ''
+ else ''
+ mkdir -p secrets/$(dirname ${v.dest})
+ echo -n ${lib.strings.escapeShellArg v.text} > ${fpath v}
+ cat >> mods <<EOF
+ ${v.user or "root"} ${v.group or "root"} ${v.permissions or "0600"} ${fpath v}
+ EOF
+ '';
+ secrets = pkgs.runCommand "secrets.tar.enc" {
+ buildInputs = [ pkgs.gnupg pkgs.sops ];
+ } ''
+ touch mods
+ tar --format=ustar --mtime='1970-01-01' -P --transform="s@${empty}@secrets@" -cf $out ${empty}/done
+ ${builtins.concatStringsSep "\n" (map dumpKey keys)}
+ cat mods | while read u g p k; do
+ tar --no-recursion --format=ustar --mtime='1970-01-01' --owner="$u" --group="$g" --mode="$p" --append -f $out "$k"
+ done
+ export HOME=$(pwd)
+ fingerprints=
+ for key in ${builtins.concatStringsSep " " config.secrets.gpgKeys}; do
+ gpg --import $key 2>/dev/null
+ fingerprints=$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 or false) keys;
+ exclPath = builtins.concatStringsSep " -o " (map (d: " -path $TMP/${d.dest}") dirs);
+ in
+ lib.optionalString (builtins.length dirs > 0) " -not \\( ${exclPath} \\) ";
+ in lib.mkIf (builtins.length keys > 0) {
+ 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" ]; 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
+ if [ -f ${config.secrets.secretsVars} ]; then
+ SOPS_AGE_KEY_FILE=$TMPWORK/keys.txt ${pkgs.sops}/bin/sops -d ${config.secrets.secretsVars} > $TMPWORK/vars.yml
+ fi
+ 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
+ '';
+ };
+
+ };
+ };
+ };
+}