nix-bitcoin/modules/secrets/secrets.nix

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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.nix-bitcoin;
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setupSecrets = concatStrings (mapAttrsToList (n: v: ''
setupSecret ${n} ${v.user} ${v.group} ${v.permissions} }
'') cfg.secrets);
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in
{
options.nix-bitcoin = {
secretsDir = mkOption {
type = types.path;
default = "/etc/nix-bitcoin-secrets";
description = "Directory to store secrets";
};
deployment.secretsDir = mkOption {
type = types.path;
description = ''
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Directory of local secrets that are transferred to the nix-bitcoin node on deployment
'';
};
secrets = mkOption {
default = {};
type = with types; attrsOf (submodule (
{ config, ... }: {
options = {
user = mkOption {
type = str;
default = "root";
};
group = mkOption {
type = str;
default = config.user;
};
permissions = mkOption {
type = str;
default = "0440";
};
};
}
));
};
setup-secrets = mkEnableOption "Set permissions for secrets generated by 'generate-secrets.sh'";
};
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config = mkIf cfg.setup-secrets {
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systemd.targets.nix-bitcoin-secrets = {
requires = [ "setup-secrets.service" ];
after = [ "setup-secrets.service" ];
};
# Operation of this service:
# - Set owner and permissions for all used secrets
# - Make all other secrets accessible to root only
# For all steps make sure that no secrets are copied to the nix store.
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#
systemd.services.setup-secrets = {
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
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script = ''
setupSecret() {
file="$1"
user="$2"
group="$3"
permissions="$4"
if [[ ! -e $file ]]; then
echo "Error: Secret file '$file' is missing"
exit 1
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fi
chown "$user:$group" "$file"
chmod "$permissions" "$file"
processedFiles+=("$file")
}
dir="${cfg.secretsDir}"
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if [[ ! -e $dir ]]; then
echo "Error: Secrets dir '$dir' is missing"
exit 1
fi
chown root: "$dir"
cd "$dir"
processedFiles=()
${setupSecrets}
# Make all other files accessible to root only
unprocessedFiles=$(comm -23 <(printf '%s\n' *) <(printf '%s\n' "''${processedFiles[@]}" | sort))
IFS=$'\n'
chown root: $unprocessedFiles
chmod 0440 $unprocessedFiles
# Now make the secrets dir accessible to other users
chmod 0751 "$dir"
'';
};
};
}