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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.snowflake-proxy;
in
{
options = {
services.snowflake-proxy = {
enable = mkEnableOption "System to defeat internet censorship";
broker = mkOption {
description = "Broker URL (default \"https://snowflake-broker.torproject.net/\")";
type = with types; nullOr str;
default = null;
};
capacity = mkOption {
description = "Limits the amount of maximum concurrent clients allowed.";
type = with types; nullOr int;
default = null;
};
relay = mkOption {
description = "websocket relay URL (default \"wss://snowflake.bamsoftware.com/\")";
type = with types; nullOr str;
default = null;
};
stun = mkOption {
description = "STUN broker URL (default \"stun:stun.stunprotocol.org:3478\")";
type = with types; nullOr str;
default = null;
};
};
};
config = mkIf cfg.enable {
systemd.services.snowflake-proxy = {
wantedBy = [ "network-online.target" ];
serviceConfig = {
ExecStart =
"${pkgs.snowflake}/bin/proxy " + concatStringsSep " " (
optional (cfg.broker != null) "-broker ${cfg.broker}"
++ optional (cfg.capacity != null) "-capacity ${builtins.toString cfg.capacity}"
++ optional (cfg.relay != null) "-relay ${cfg.relay}"
++ optional (cfg.stun != null) "-stun ${cfg.stun}"
);
# Security Hardening
# Refer to systemd.exec(5) for option descriptions.
CapabilityBoundingSet = "";
# implies RemoveIPC=, PrivateTmp=, NoNewPrivileges=, RestrictSUIDSGID=,
# ProtectSystem=strict, ProtectHome=read-only
DynamicUser = true;
LockPersonality = true;
PrivateDevices = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectProc = "invisible";
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
RestrictNamespaces = true;
RestrictRealtime = true;
SystemCallArchitectures = "native";
SystemCallFilter = "~@clock @cpu-emulation @debug @mount @obsolete @reboot @swap @privileged @resources";
UMask = "0077";
};
};
};
meta.maintainers = with maintainers; [ yayayayaka ];
}
|