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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.opensnitch;
format = pkgs.formats.json {};
predefinedRules = flip mapAttrs cfg.rules (name: cfg: {
file = pkgs.writeText "rule" (builtins.toJSON cfg);
});
in {
options = {
services.opensnitch = {
enable = mkEnableOption (mdDoc "Opensnitch application firewall");
rules = mkOption {
default = {};
example = literalExpression ''
{
"tor" = {
"name" = "tor";
"enabled" = true;
"action" = "allow";
"duration" = "always";
"operator" = {
"type" ="simple";
"sensitive" = false;
"operand" = "process.path";
"data" = "''${lib.getBin pkgs.tor}/bin/tor";
};
};
};
'';
description = mdDoc ''
Declarative configuration of firewall rules.
All rules will be stored in `/var/lib/opensnitch/rules`.
See [upstream documentation](https://github.com/evilsocket/opensnitch/wiki/Rules)
for available options.
'';
type = types.submodule {
freeformType = format.type;
};
};
settings = mkOption {
type = types.submodule {
freeformType = format.type;
options = {
Server = {
Address = mkOption {
type = types.str;
description = mdDoc ''
Unix socket path (unix:///tmp/osui.sock, the "unix:///" part is
mandatory) or TCP socket (192.168.1.100:50051).
'';
};
LogFile = mkOption {
type = types.path;
description = mdDoc ''
File to write logs to (use /dev/stdout to write logs to standard
output).
'';
};
};
DefaultAction = mkOption {
type = types.enum [ "allow" "deny" ];
description = mdDoc ''
Default action whether to block or allow application internet
access.
'';
};
DefaultDuration = mkOption {
type = types.enum [
"once" "always" "until restart" "30s" "5m" "15m" "30m" "1h"
];
description = mdDoc ''
Default duration of firewall rule.
'';
};
InterceptUnknown = mkOption {
type = types.bool;
description = mdDoc ''
Whether to intercept spare connections.
'';
};
ProcMonitorMethod = mkOption {
type = types.enum [ "ebpf" "proc" "ftrace" "audit" ];
description = mdDoc ''
Which process monitoring method to use.
'';
};
LogLevel = mkOption {
type = types.enum [ 0 1 2 3 4 ];
description = mdDoc ''
Default log level from 0 to 4 (debug, info, important, warning,
error).
'';
};
Firewall = mkOption {
type = types.enum [ "iptables" "nftables" ];
description = mdDoc ''
Which firewall backend to use.
'';
};
Stats = {
MaxEvents = mkOption {
type = types.int;
description = mdDoc ''
Max events to send to the GUI.
'';
};
MaxStats = mkOption {
type = types.int;
description = mdDoc ''
Max stats per item to keep in backlog.
'';
};
};
};
};
description = mdDoc ''
opensnitchd configuration. Refer to [upstream documentation](https://github.com/evilsocket/opensnitch/wiki/Configurations)
for details on supported values.
'';
};
};
};
config = mkIf cfg.enable {
# pkg.opensnitch is referred to elsewhere in the module so we don't need to worry about it being garbage collected
services.opensnitch.settings = mapAttrs (_: v: mkDefault v) (builtins.fromJSON (builtins.unsafeDiscardStringContext (builtins.readFile "${pkgs.opensnitch}/etc/opensnitchd/default-config.json")));
systemd = {
packages = [ pkgs.opensnitch ];
services.opensnitchd.wantedBy = [ "multi-user.target" ];
};
systemd.services.opensnitchd.preStart = mkIf (cfg.rules != {}) (let
rules = flip mapAttrsToList predefinedRules (file: content: {
inherit (content) file;
local = "/var/lib/opensnitch/rules/${file}.json";
});
in ''
# Remove all firewall rules from `/var/lib/opensnitch/rules` that are symlinks to a store-path,
# but aren't declared in `cfg.rules` (i.e. all networks that were "removed" from
# `cfg.rules`).
find /var/lib/opensnitch/rules -type l -lname '${builtins.storeDir}/*' ${optionalString (rules != {}) ''
-not \( ${concatMapStringsSep " -o " ({ local, ... }:
"-name '${baseNameOf local}*'")
rules} \) \
''} -delete
${concatMapStrings ({ file, local }: ''
ln -sf '${file}' "${local}"
'') rules}
if [ ! -f /etc/opensnitchd/system-fw.json ]; then
cp "${pkgs.opensnitch}/etc/opensnitchd/system-fw.json" "/etc/opensnitchd/system-fw.json"
fi
'');
environment.etc = mkMerge [ ({
"opensnitchd/default-config.json".source = format.generate "default-config.json" cfg.settings;
}) (mkIf (cfg.settings.ProcMonitorMethod == "ebpf") {
"opensnitchd/opensnitch.o".source = "${config.boot.kernelPackages.opensnitch-ebpf}/etc/opensnitchd/opensnitch.o";
"opensnitchd/opensnitch-dns.o".source = "${config.boot.kernelPackages.opensnitch-ebpf}/etc/opensnitchd/opensnitch-dns.o";
"opensnitchd/opensnitch-procs.o".source = "${config.boot.kernelPackages.opensnitch-ebpf}/etc/opensnitchd/opensnitch-procs.o";
})];
};
}
|