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|
{
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
'';
};
};
};
};
}
|
