101 lines
3.7 KiB
Nix
101 lines
3.7 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.sane.services.rsync-net;
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sane-backup-rsync-net = pkgs.static-nix-shell.mkBash {
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pname = "sane-backup-rsync-net";
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pkgs = [
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"nettools"
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"openssh"
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"rsync"
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"sane-scripts.vpn"
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];
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srcRoot = ./.;
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};
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in
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{
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options = with lib; {
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sane.services.rsync-net.enable = mkEnableOption "periodically backup data to rsync.net";
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sane.services.rsync-net.dirs = mkOption {
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type = types.listOf types.str;
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description = ''
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list of directories to upload to rsync.net.
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note that this module does NOT add any encryption to the files (layer that yourself).
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'';
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default = lib.optionals config.sane.persist.enable [
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"/nix/persist/private" #< XXX: make sure to do the encrypted version, not /mnt/persist/private!
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];
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.services.rsync-net = {
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description = "backup files to rsync.net";
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serviceConfig.ExecStart = "${lib.getExe sane-backup-rsync-net} ${lib.escapeShellArgs cfg.dirs}";
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serviceConfig.Type = "simple";
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serviceConfig.Restart = "no";
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serviceConfig.User = "colin";
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serviceConfig.AmbientCapabilities = [
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# needs to be able to read files owned by any user
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"CAP_DAC_READ_SEARCH"
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];
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serviceConfig.RestrictNetworkInterfaces = [
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# strictly forbid sending traffic over any non ethernet/wifi interface,
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# because i don't want this e.g. consuming all my cellular data.
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# TODO: test this. i don't know that the moby kernel/systemd actually supports these options
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"lo" # for DNS
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"eth0"
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"wlan0"
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];
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# hardening
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serviceConfig.CapabilityBoundingSet = [ "CAP_DAC_READ_SEARCH" ];
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serviceConfig.ReadWritePaths = builtins.map (d: "${d}/zzz-rsync-net") cfg.dirs;
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serviceConfig.ReadOnlyPaths = cfg.dirs;
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serviceConfig.RestrictAddressFamilies = "AF_INET AF_INET6";
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serviceConfig.LockPersonality = true;
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serviceConfig.MemoryDenyWriteExecute = true;
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serviceConfig.NoNewPrivileges = true;
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serviceConfig.PrivateDevices = true;
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serviceConfig.PrivateMounts = true;
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serviceConfig.PrivateTmp = true;
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serviceConfig.ProcSubset = "pid";
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serviceConfig.ProtectClock = true;
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serviceConfig.ProtectControlGroups = true;
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serviceConfig.ProtectHome = true;
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serviceConfig.ProtectHostname = true;
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serviceConfig.ProtectKernelLogs = true;
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serviceConfig.ProtectKernelModules = true;
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serviceConfig.ProtectKernelTunables = true;
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serviceConfig.ProtectProc = "invisible";
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serviceConfig.ProtectSystem = "strict";
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serviceConfig.RemoveIPC = true;
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serviceConfig.RestrictFileSystems = "@basic-api @common-block @temporary";
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serviceConfig.RestrictNamespaces = true;
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serviceConfig.RestrictSUIDSGID = true;
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serviceConfig.SystemCallArchitectures = "native";
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serviceConfig.SystemCallFilter = [
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"@system-service"
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"~@chown"
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"~@cpu-emulation"
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"~@keyring"
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"~@setuid"
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];
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# hardening exceptions:
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serviceConfig.PrivateUsers = false; #< CAP_DAC_READ_SEARCH in the root namespace means we can't do any user namespacing
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# serviceConfig.NoNewPrivileges = false; #< bwrap'd dac_read_search
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# serviceConfig.PrivateDevices = false; #< passt/pasta
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# serviceConfig.RestrictNamespaces = false; #< bwrap
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# serviceConfig.RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK"; #< AF_NETLINK is for passt/pasta
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};
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systemd.timers.rsync-net = {
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wantedBy = [ "multi-user.target" ];
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timerConfig = {
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# run 2x daily; at 11:00:00, 23:00:00
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OnCalendar = "11,23:00:00";
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};
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};
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};
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}
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