pyrox.dev
1{
2 config,
3 lib,
4 pkgs,
5 ...
6}:
7
8with lib;
9
10let
11 cfg = config.services.snowflake-proxy;
12in
13{
14 options = {
15 services.snowflake-proxy = {
16 enable = mkEnableOption "snowflake-proxy, a system to defeat internet censorship";
17
18 broker = mkOption {
19 description = "Broker URL (default \"https://snowflake-broker.torproject.net/\")";
20 type = with types; nullOr str;
21 default = null;
22 };
23
24 capacity = mkOption {
25 description = "Limits the amount of maximum concurrent clients allowed.";
26 type = with types; nullOr int;
27 default = null;
28 };
29
30 relay = mkOption {
31 description = "websocket relay URL (default \"wss://snowflake.bamsoftware.com/\")";
32 type = with types; nullOr str;
33 default = null;
34 };
35
36 stun = mkOption {
37 description = "STUN broker URL (default \"stun:stun.stunprotocol.org:3478\")";
38 type = with types; nullOr str;
39 default = null;
40 };
41 };
42 };
43
44 config = mkIf cfg.enable {
45 systemd.services.snowflake-proxy = {
46 wantedBy = [ "network-online.target" ];
47 serviceConfig = {
48 ExecStart =
49 "${pkgs.snowflake}/bin/proxy "
50 + concatStringsSep " " (
51 optional (cfg.broker != null) "-broker ${cfg.broker}"
52 ++ optional (cfg.capacity != null) "-capacity ${builtins.toString cfg.capacity}"
53 ++ optional (cfg.relay != null) "-relay ${cfg.relay}"
54 ++ optional (cfg.stun != null) "-stun ${cfg.stun}"
55 );
56
57 # Security Hardening
58 # Refer to systemd.exec(5) for option descriptions.
59 CapabilityBoundingSet = "";
60
61 # implies RemoveIPC=, PrivateTmp=, NoNewPrivileges=, RestrictSUIDSGID=,
62 # ProtectSystem=strict, ProtectHome=read-only
63 DynamicUser = true;
64 LockPersonality = true;
65 PrivateDevices = true;
66 PrivateUsers = true;
67 ProcSubset = "pid";
68 ProtectClock = true;
69 ProtectControlGroups = true;
70 ProtectHome = true;
71 ProtectHostname = true;
72 ProtectKernelLogs = true;
73 ProtectProc = "invisible";
74 ProtectKernelModules = true;
75 ProtectKernelTunables = true;
76 RestrictAddressFamilies = [
77 "AF_INET"
78 "AF_INET6"
79 "AF_UNIX"
80 ];
81 RestrictNamespaces = true;
82 RestrictRealtime = true;
83 SystemCallArchitectures = "native";
84 SystemCallFilter = [
85 "@system-service"
86 "~@privileged"
87 ];
88 UMask = "0077";
89 };
90 };
91 };
92
93 meta.maintainers = with maintainers; [ yayayayaka ];
94}