Commit 4ca92fb6 authored by Vir Chaudhury's avatar Vir Chaudhury
Browse files

nixos/isolate: init module

parent 6eb807ee

nixos/doc/manual/release-notes/rl-2405.section.md

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@@ -191,6 +191,8 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m 


- [prometheus-nats-exporter](https://github.com/nats-io/prometheus-nats-exporter), a Prometheus exporter for NATS. Available as [services.prometheus.exporters.nats](#opt-services.prometheus.exporters.nats.enable).



- [isolate](https://github.com/ioi/isolate), a sandbox for securely executing untrusted programs. Available as [security.isolate](#opt-security.isolate.enable).



## Backward Incompatibilities {#sec-release-24.05-incompatibilities}



<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

nixos/modules/module-list.nix

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@@ -325,6 +325,7 @@ 
  ./security/duosec.nix

  ./security/google_oslogin.nix

  ./security/ipa.nix

  ./security/isolate.nix

  ./security/krb5

  ./security/lock-kernel-modules.nix

  ./security/misc.nix

nixos/modules/security/isolate.nix

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{ config, lib, pkgs, ... }:



let

  inherit (lib) mkEnableOption mkPackageOption mkOption types mkIf maintainers;



  cfg = config.security.isolate;

  configFile = pkgs.writeText "isolate-config.cf" ''

    box_root=${cfg.boxRoot}

    lock_root=${cfg.lockRoot}

    cg_root=${cfg.cgRoot}

    first_uid=${toString cfg.firstUid}

    first_gid=${toString cfg.firstGid}

    num_boxes=${toString cfg.numBoxes}

    restricted_init=${if cfg.restrictedInit then "1" else "0"}

    ${cfg.extraConfig}

  '';

  isolate = pkgs.symlinkJoin {

    name = "isolate-wrapped-${pkgs.isolate.version}";



    paths = [ pkgs.isolate ];



    nativeBuildInputs = [ pkgs.makeWrapper ];



    postBuild = ''

      wrapProgram $out/bin/isolate \

        --set ISOLATE_CONFIG_FILE ${configFile}



      wrapProgram $out/bin/isolate-cg-keeper \

        --set ISOLATE_CONFIG_FILE ${configFile}

    '';

  };

in

{

  options.security.isolate = {

    enable = mkEnableOption ''

      Sandbox for securely executing untrusted programs

    '';



    package = mkPackageOption pkgs "isolate-unwrapped" { };



    boxRoot = mkOption {

      type = types.path;

      default = "/var/lib/isolate/boxes";

      description = ''

        All sandboxes are created under this directory.

        To avoid symlink attacks, this directory and all its ancestors

        must be writeable only by root.

      '';

    };



    lockRoot = mkOption {

      type = types.path;

      default = "/run/isolate/locks";

      description = ''

        Directory where lock files are created.

      '';

    };



    cgRoot = mkOption {

      type = types.str;

      default = "auto:/run/isolate/cgroup";

      description = ''

        Control group which subgroups are placed under.

        Either an explicit path to a subdirectory in cgroupfs, or "auto:file" to read

        the path from "file", where it is put by `isolate-cg-helper`.

      '';

    };



    firstUid = mkOption {

      type = types.numbers.between 1000 65533;

      default = 60000;

      description = ''

        Start of block of UIDs reserved for sandboxes.

      '';

    };



    firstGid = mkOption {

      type = types.numbers.between 1000 65533;

      default = 60000;

      description = ''

        Start of block of GIDs reserved for sandboxes.

      '';

    };



    numBoxes = mkOption {

      type = types.numbers.between 1000 65533;

      default = 1000;

      description = ''

        Number of UIDs and GIDs to reserve, starting from

        {option}`firstUid` and {option}`firstGid`.

      '';

    };



    restrictedInit = mkOption {

      type = types.bool;

      default = false;

      description = ''

        If true, only root can create sandboxes.

      '';

    };



    extraConfig = mkOption {

      type = types.str;

      default = "";

      description = ''

        Extra configuration to append to the configuration file.

      '';

    };

  };



  config = mkIf cfg.enable {

    environment.systemPackages = [

      isolate

    ];



    systemd.services.isolate = {

      description = "Isolate control group hierarchy daemon";

      wantedBy = [ "multi-user.target" ];

      serviceConfig = {

        Type = "notify";

        ExecStart = "${isolate}/bin/isolate-cg-keeper";

        Slice = "isolate.slice";

        Delegate = true;

      };

    };



    systemd.slices.isolate = {

      description = "Isolate sandbox slice";

    };



    meta.maintainers = with maintainers; [ virchau13 ];

  };

}