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{ lib, pkgs, config, ... }:
{
options.secrets = {
keys = lib.mkOption {
type = lib.types.listOf lib.types.unspecified;
default = [];
description = "Keys to upload to server";
};
location = lib.mkOption {
type = lib.types.path;
default = "/var/secrets";
description = "Location where to put the keys";
};
# Read-only variables
fullPaths = lib.mkOption {
type = lib.types.attrsOf lib.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 $out/done";
dumpKey = v: ''
mkdir -p secrets/$(dirname ${v.dest})
echo -n ${lib.strings.escapeShellArg v.text} > secrets/${v.dest}
cat >> mods <<EOF
${v.user or "root"} ${v.group or "root"} ${v.permissions or "0600"} secrets/${v.dest}
EOF
'';
secrets = pkgs.runCommand "secrets.tar" {} ''
touch mods
tar --format=ustar --mtime='1970-01-01' -P --transform="s@${empty}@secrets@" -cf $out ${empty}/done
${builtins.concatStringsSep "\n" (map dumpKey keys)}
cat mods | while read u g p k; do
tar --format=ustar --mtime='1970-01-01' --owner="$u" --group="$g" --mode="$p" --append -f $out "$k"
done
'';
in lib.mkIf (builtins.length keys > 0) {
system.activationScripts.secrets = {
deps = [ "users" "wrappers" ];
text = ''
install -m0750 -o root -g keys -d ${location}
if [ -f /run/keys/secrets.tar ]; then
if [ ! -f ${location}/currentSecrets ] || ! sha512sum -c --status "${location}/currentSecrets"; then
echo "rebuilding secrets"
TMP=$(${pkgs.coreutils}/bin/mktemp -d)
if [ -n "$TMP" ]; then
install -m0750 -o root -g keys -d $TMP
${pkgs.gnutar}/bin/tar --strip-components 1 -C $TMP -xf /run/keys/secrets.tar
sha512sum /run/keys/secrets.tar > $TMP/currentSecrets
find $TMP -type d -exec chown root:keys {} \; -exec chmod o-rx {} \;
${pkgs.rsync}/bin/rsync -O -c -av --delete $TMP/ ${location}
rm -rf $TMP
fi
fi
fi
'';
};
deployment.keys."secrets.tar" = {
permissions = "0400";
# keyFile below is not evaluated at build time by nixops, so the
# `secrets` path doesn’t necessarily exist when uploading the
# keys, and nixops is unhappy.
user = "root${builtins.substring 10000 1 secrets}";
group = "root";
keyFile = "${secrets}";
};
};
}
|
