fortify/nixos.nix

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{
lib,
pkgs,
config,
...
}:
let
inherit (lib)
types
mkOption
mkEnableOption
mkIf
mapAttrs
mapAttrsToList
foldlAttrs
optional
;
cfg = config.environment.fortify;
in
{
options = {
environment.fortify = {
enable = mkEnableOption "fortify";
target = mkOption {
default = { };
type =
let
inherit (types)
str
enum
bool
package
anything
submodule
listOf
attrsOf
nullOr
;
in
attrsOf (submodule {
options = {
packages = mkOption {
type = listOf package;
default = [ ];
description = ''
List of extra packages to install via home-manager.
'';
};
launchers = mkOption {
type = attrsOf (submodule {
options = {
command = mkOption {
type = nullOr str;
default = null;
description = ''
Command to run as the target user.
Setting this to null will default command to wrapper name.
'';
};
capability = {
wayland = mkOption {
type = bool;
default = true;
description = ''
Whether to share the Wayland socket.
'';
};
x11 = mkOption {
type = bool;
default = false;
description = ''
Whether to share the X11 socket and allow connection.
'';
};
dbus = mkOption {
type = bool;
default = false;
description = ''
Whether to proxy D-Bus.
'';
};
pulse = mkOption {
type = bool;
default = true;
description = ''
Whether to share the PulseAudio socket and cookie.
'';
};
};
share = mkOption {
type = nullOr package;
default = null;
description = ''
Package containing share files.
Setting this to null will default package name to wrapper name.
'';
};
method = mkOption {
type = enum [
"fortify"
"fortify-sudo"
"sudo"
];
default = "fortify";
description = ''
Launch method for the sandboxed program.
'';
};
};
});
default = { };
};
persistence = mkOption {
type = submodule {
options = {
directories = mkOption {
type = listOf anything;
default = [ ];
};
files = mkOption {
type = listOf anything;
default = [ ];
};
};
};
description = ''
Per-user state passed to github:nix-community/impermanence.
'';
};
extraConfig = mkOption {
type = anything;
default = { };
description = "Extra home-manager configuration.";
};
};
});
};
package = mkOption {
type = types.package;
default = pkgs.callPackage ./package.nix { };
description = "Package providing fortify.";
};
user = mkOption {
type = types.str;
description = "Privileged user account.";
};
shell = mkOption {
type = types.str;
description = ''
Shell set up to source home-manager for the privileged user.
Required for setting up the environment of sandboxed programs.
'';
};
stateDir = mkOption {
type = types.str;
description = ''
The path to persistent storage where per-user state should be stored.
'';
};
};
};
config = mkIf cfg.enable {
environment.persistence.${cfg.stateDir}.users = mapAttrs (_: target: target.persistence) cfg.target;
home-manager.users =
mapAttrs (_: target: target.extraConfig // { home.packages = target.packages; }) cfg.target
// {
${cfg.user}.home.packages =
let
wrap =
user: launchers:
mapAttrsToList (
name: launcher:
with launcher.capability;
let
command = if launcher.command == null then name else launcher.command;
capArgs =
(if wayland then " -wayland" else "")
+ (if x11 then " -X" else "")
+ (if dbus then " -dbus" else "")
+ (if pulse then " -pulse" else "")
+ (if launcher.method == "fortify-sudo" then " -sudo" else "");
in
pkgs.writeShellScriptBin name (
if launcher.method == "sudo" then
''
exec sudo -u ${user} -i ${command} $@
''
else
''
exec fortify${capArgs} -u ${user} ${cfg.shell} -c "exec ${command} $@"
''
)
) launchers;
in
foldlAttrs (
acc: user: target:
acc
++ (foldlAttrs (
shares: name: launcher:
let
pkg = if launcher.share != null then launcher.share else pkgs.${name};
link = source: "[ -d '${source}' ] && ln -sv '${source}' $out/share || true";
in
shares
++ optional (launcher.method == "fortify") (
pkgs.runCommand "${name}-share" { } ''
mkdir -p $out/share
${link "${pkg}/share/applications"}
${link "${pkg}/share/icons"}
${link "${pkg}/share/man"}
''
)
) (wrap user target.launchers) target.launchers)
) [ cfg.package ] cfg.target;
};
security.polkit.extraConfig =
let
allowList = builtins.toJSON (mapAttrsToList (name: _: name) cfg.target);
in
''
polkit.addRule(function(action, subject) {
if (action.id == "org.freedesktop.machine1.host-shell" &&
${allowList}.indexOf(action.lookup("user")) > -1 &&
subject.user == "${cfg.user}") {
return polkit.Result.YES;
}
});
'';
};
}