blob: 9c98f8519548b573a53e3856bec2f1b152d4af72 (
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
|
{ config, lib, pkgs, ... }:
with lib;
let
nssModulesPath = config.system.nssModules.path;
cfg = config.services.nscd;
in
{
###### interface
options = {
services.nscd = {
enable = mkOption {
type = types.bool;
default = true;
description = ''
Whether to enable the Name Service Cache Daemon.
Disabling this is strongly discouraged, as this effectively disables NSS Lookups
from all non-glibc NSS modules, including the ones provided by systemd.
'';
};
user = mkOption {
type = types.str;
default = "nscd";
description = ''
User account under which nscd runs.
'';
};
group = mkOption {
type = types.str;
default = "nscd";
description = ''
User group under which nscd runs.
'';
};
config = mkOption {
type = types.lines;
default = builtins.readFile ./nscd.conf;
description = "Configuration to use for Name Service Cache Daemon.";
};
package = mkOption {
type = types.package;
default = if pkgs.stdenv.hostPlatform.libc == "glibc"
then pkgs.stdenv.cc.libc.bin
else pkgs.glibc.bin;
defaultText = lib.literalExpression ''
if pkgs.stdenv.hostPlatform.libc == "glibc"
then pkgs.stdenv.cc.libc.bin
else pkgs.glibc.bin;
'';
description = "package containing the nscd binary to be used by the service";
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.etc."nscd.conf".text = cfg.config;
users.users.${cfg.user} = {
isSystemUser = true;
group = cfg.group;
};
users.groups.${cfg.group} = {};
systemd.services.nscd =
{ description = "Name Service Cache Daemon";
before = [ "nss-lookup.target" "nss-user-lookup.target" ];
wants = [ "nss-lookup.target" "nss-user-lookup.target" ];
wantedBy = [ "multi-user.target" ];
environment = { LD_LIBRARY_PATH = nssModulesPath; };
restartTriggers = [
config.environment.etc.hosts.source
config.environment.etc."nsswitch.conf".source
config.environment.etc."nscd.conf".source
];
# In some configurations, nscd needs to be started as root; it will
# drop privileges after all the NSS modules have read their
# configuration files. So prefix the ExecStart command with "!" to
# prevent systemd from dropping privileges early. See ExecStart in
# systemd.service(5). We use a static user, because some NSS modules
# sill want to read their configuration files after the privilege drop
# and so users can set the owner of those files to the nscd user.
serviceConfig =
{ ExecStart = "!@${cfg.package}/bin/nscd nscd";
Type = "forking";
User = cfg.user;
Group = cfg.group;
RemoveIPC = true;
PrivateTmp = true;
NoNewPrivileges = true;
RestrictSUIDSGID = true;
ProtectSystem = "strict";
ProtectHome = "read-only";
RuntimeDirectory = "nscd";
PIDFile = "/run/nscd/nscd.pid";
Restart = "always";
ExecReload =
[ "${cfg.package}/bin/nscd --invalidate passwd"
"${cfg.package}/bin/nscd --invalidate group"
"${cfg.package}/bin/nscd --invalidate hosts"
];
};
};
};
}
|