blob: 45c841dbea8b232185ea3d9aa5eaec357eb1ab32 (
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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.pppd;
in
{
meta = {
maintainers = with maintainers; [ danderson ];
};
options = {
services.pppd = {
enable = mkEnableOption "pppd";
package = mkOption {
default = pkgs.ppp;
defaultText = "pkgs.ppp";
type = types.package;
description = "pppd package to use.";
};
peers = mkOption {
default = {};
description = "pppd peers.";
type = types.attrsOf (types.submodule (
{ name, ... }:
{
options = {
name = mkOption {
type = types.str;
default = name;
example = "dialup";
description = "Name of the PPP peer.";
};
enable = mkOption {
type = types.bool;
default = true;
example = false;
description = "Whether to enable this PPP peer.";
};
autostart = mkOption {
type = types.bool;
default = true;
example = false;
description = "Whether the PPP session is automatically started at boot time.";
};
config = mkOption {
type = types.lines;
default = "";
description = "pppd configuration for this peer, see the pppd(8) man page.";
};
};
}));
};
};
};
config = let
enabledConfigs = filter (f: f.enable) (attrValues cfg.peers);
mkEtc = peerCfg: {
name = "ppp/peers/${peerCfg.name}";
value.text = peerCfg.config;
};
mkSystemd = peerCfg: {
name = "pppd-${peerCfg.name}";
value = {
restartTriggers = [ config.environment.etc."ppp/peers/${peerCfg.name}".source ];
before = [ "network.target" ];
wants = [ "network.target" ];
after = [ "network-pre.target" ];
environment = {
# pppd likes to write directly into /var/run. This is rude
# on a modern system, so we use libredirect to transparently
# move those files into /run/pppd.
LD_PRELOAD = "${pkgs.libredirect}/lib/libredirect.so";
NIX_REDIRECTS = "/var/run=/run/pppd";
};
serviceConfig = let
capabilities = [
"CAP_BPF"
"CAP_SYS_TTY_CONFIG"
"CAP_NET_ADMIN"
"CAP_NET_RAW"
];
in
{
ExecStart = "${getBin cfg.package}/sbin/pppd call ${peerCfg.name} nodetach nolog";
Restart = "always";
RestartSec = 5;
AmbientCapabilities = capabilities;
CapabilityBoundingSet = capabilities;
KeyringMode = "private";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateMounts = true;
PrivateTmp = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelModules = true;
# pppd can be configured to tweak kernel settings.
ProtectKernelTunables = false;
ProtectSystem = "strict";
RemoveIPC = true;
RestrictAddressFamilies = "AF_PACKET AF_UNIX AF_PPPOX AF_ATMPVC AF_ATMSVC AF_INET AF_INET6 AF_IPX";
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SecureBits = "no-setuid-fixup-locked noroot-locked";
SystemCallFilter = "@system-service";
SystemCallArchitectures = "native";
# All pppd instances on a system must share a runtime
# directory in order for PPP multilink to work correctly. So
# we give all instances the same /run/pppd directory to store
# things in.
#
# For the same reason, we can't set PrivateUsers=true, because
# all instances need to run as the same user to access the
# multilink database.
RuntimeDirectory = "pppd";
RuntimeDirectoryPreserve = true;
};
wantedBy = mkIf peerCfg.autostart [ "multi-user.target" ];
};
};
etcFiles = listToAttrs (map mkEtc enabledConfigs);
systemdConfigs = listToAttrs (map mkSystemd enabledConfigs);
in mkIf cfg.enable {
environment.etc = etcFiles;
systemd.services = systemdConfigs;
};
}
|