blob: 072f561f5c3c6042f01ec2d79e1bab016e5e1781 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.uptermd;
in
{
options = {
services.uptermd = {
enable = mkEnableOption "uptermd";
openFirewall = mkOption {
type = types.bool;
default = false;
description = ''
Whether to open the firewall for the port in <option>services.uptermd.port</option>.
'';
};
port = mkOption {
type = types.port;
default = 2222;
description = ''
Port the server will listen on.
'';
};
listenAddress = mkOption {
type = types.str;
default = "[::]";
example = "127.0.0.1";
description = ''
Address the server will listen on.
'';
};
hostKey = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/keys/upterm_host_ed25519_key";
description = ''
Path to SSH host key. If not defined, an ed25519 keypair is generated automatically.
'';
};
extraFlags = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--debug" ];
description = ''
Extra flags passed to the uptermd command.
'';
};
};
};
config = mkIf cfg.enable {
networking.firewall = mkIf cfg.openFirewall {
allowedTCPPorts = [ cfg.port ];
};
systemd.services.uptermd = {
description = "Upterm Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
path = [ pkgs.openssh ];
preStart = mkIf (cfg.hostKey == null) ''
if ! [ -f ssh_host_ed25519_key ]; then
ssh-keygen \
-t ed25519 \
-f ssh_host_ed25519_key \
-N ""
fi
'';
serviceConfig = {
StateDirectory = "uptermd";
WorkingDirectory = "/var/lib/uptermd";
ExecStart = "${pkgs.upterm}/bin/uptermd --ssh-addr ${cfg.listenAddress}:${toString cfg.port} --private-key ${if cfg.hostKey == null then "ssh_host_ed25519_key" else cfg.hostKey} ${concatStringsSep " " cfg.extraFlags}";
# Hardening
AmbientCapabilities = mkIf (cfg.port < 1024) [ "CAP_NET_BIND_SERVICE" ];
CapabilityBoundingSet = mkIf (cfg.port < 1024) [ "CAP_NET_BIND_SERVICE" ];
PrivateUsers = cfg.port >= 1024;
LockPersonality = true;
MemoryDenyWriteExecute = true;
PrivateDevices = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
};
};
};
}
|