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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
|
{pkgs, config, ...}:
with pkgs.lib;
let
ids = config.ids;
users = config.users;
userOpts = { name, config, ... }: {
options = {
name = mkOption {
type = types.str;
description = "The name of the user account. If undefined, the name of the attribute set will be used.";
};
description = mkOption {
type = types.str;
default = "";
description = "A short description of the user account.";
};
uid = mkOption {
type = with types; uniq (nullOr int);
default = null;
description = "The account UID. If undefined, NixOS will select a free UID.";
};
group = mkOption {
type = types.str;
default = "nogroup";
description = "The user's primary group.";
};
extraGroups = mkOption {
type = types.listOf types.string;
default = [];
description = "The user's auxiliary groups.";
};
home = mkOption {
type = types.str;
default = "/var/empty";
description = "The user's home directory.";
};
shell = mkOption {
type = types.str;
default = "/run/current-system/sw/sbin/nologin";
description = "The path to the user's shell.";
};
createHome = mkOption {
type = types.bool;
default = false;
description = "If true, the home directory will be created automatically.";
};
useDefaultShell = mkOption {
type = types.bool;
default = false;
description = "If true, the user's shell will be set to <literal>users.defaultUserShell</literal>.";
};
password = mkOption {
type = with types; uniq (nullOr string);
default = null;
description = "The user's password. If undefined, no password is set for the user. Warning: do not set confidential information here because this data would be readable by all. This option should only be used for public account such as guest.";
};
isSystemUser = mkOption {
type = types.bool;
default = true;
description = "Indicates if the user is a system user or not.";
};
createUser = mkOption {
type = types.bool;
default = true;
description = "
Indicates if the user should be created automatically as a local user.
Set this to false if the user for instance is an LDAP user. NixOS will
then not modify any of the basic properties for the user account.
";
};
isAlias = mkOption {
type = types.bool;
default = false;
description = "If true, the UID of this user is not required to be unique and can thus alias another user.";
};
};
config = {
name = mkDefault name;
uid = mkDefault (attrByPath [name] null ids.uids);
shell = mkIf config.useDefaultShell (mkDefault users.defaultUserShell);
};
};
groupOpts = { name, config, ... }: {
options = {
name = mkOption {
type = types.str;
description = "The name of the group. If undefined, the name of the attribute set will be used.";
};
gid = mkOption {
type = with types; uniq (nullOr int);
default = null;
description = "The GID of the group. If undefined, NixOS will select a free GID.";
};
};
config = {
name = mkDefault name;
gid = mkDefault (attrByPath [name] null ids.gids);
};
};
# Note: the 'X' in front of the password is to distinguish between
# having an empty password, and not having a password.
serializedUser = u: "${u.name}\n${u.description}\n${if u.uid != null then toString u.uid else ""}\n${u.group}\n${toString (concatStringsSep "," u.extraGroups)}\n${u.home}\n${u.shell}\n${toString u.createHome}\n${if u.password != null then "X" + u.password else ""}\n${toString u.isSystemUser}\n${toString u.createUser}\n${toString u.isAlias}\n";
usersFile = pkgs.writeText "users" (
let
p = partition (u: u.isAlias) (attrValues config.users.extraUsers);
in concatStrings (map serializedUser p.wrong ++ map serializedUser p.right));
in
{
###### interface
options = {
users.extraUsers = mkOption {
default = {};
type = types.loaOf types.optionSet;
example = {
alice = {
uid = 1234;
description = "Alice";
home = "/home/alice";
createHome = true;
group = "users";
extraGroups = ["wheel"];
shell = "/bin/sh";
password = "foobar";
};
};
description = ''
Additional user accounts to be created automatically by the system.
This can also be used to set options for root.
'';
options = [ userOpts ];
};
users.extraGroups = mkOption {
default = {};
example =
{ students.gid = 1001;
hackers = { };
};
type = types.loaOf types.optionSet;
description = ''
Additional groups to be created automatically by the system.
'';
options = [ groupOpts ];
};
};
###### implementation
config = {
users.extraUsers = {
root = {
description = "System administrator";
home = "/root";
shell = config.users.defaultUserShell;
group = "root";
};
nobody = {
description = "Unprivileged account (don't use!)";
};
};
users.extraGroups = {
root = { };
wheel = { };
disk = { };
kmem = { };
tty = { };
floppy = { };
uucp = { };
lp = { };
cdrom = { };
tape = { };
audio = { };
video = { };
dialout = { };
nogroup = { };
users = { };
nixbld = { };
utmp = { };
adm = { }; # expected by journald
};
system.activationScripts.rootPasswd = stringAfter [ "etc" ]
''
# If there is no password file yet, create a root account with an
# empty password.
if ! test -e /etc/passwd; then
rootHome=/root
touch /etc/passwd; chmod 0644 /etc/passwd
touch /etc/group; chmod 0644 /etc/group
touch /etc/shadow; chmod 0600 /etc/shadow
# Can't use useradd, since it complains that it doesn't know us
# (bootstrap problem!).
echo "root:x:0:0:System administrator:$rootHome:${config.users.defaultUserShell}" >> /etc/passwd
echo "root::::::::" >> /etc/shadow
fi
'';
system.activationScripts.users = stringAfter [ "groups" ]
''
echo "updating users..."
cat ${usersFile} | while true; do
read name || break
read description
read uid
read group
read extraGroups
read home
read shell
read createHome
read password
read isSystemUser
read createUser
read isAlias
if [ -z "$createUser" ]; then
continue
fi
if ! curEnt=$(getent passwd "$name"); then
useradd ''${isSystemUser:+--system} \
--comment "$description" \
''${uid:+--uid $uid} \
--gid "$group" \
--groups "$extraGroups" \
--home "$home" \
--shell "$shell" \
''${createHome:+--create-home} \
''${isAlias:+--non-unique} \
"$name"
if test "''${password:0:1}" = 'X'; then
(echo "''${password:1}"; echo "''${password:1}") | ${pkgs.shadow}/bin/passwd "$name"
fi
else
#echo "updating user $name..."
oldIFS="$IFS"; IFS=:; set -- $curEnt; IFS="$oldIFS"
prevUid=$3
prevHome=$6
# Don't change the home directory if it's the same to prevent
# unnecessary warnings about logged in users.
if test "$prevHome" = "$home"; then unset home; fi
usermod \
--comment "$description" \
--gid "$group" \
--groups "$extraGroups" \
''${home:+--home "$home"} \
--shell "$shell" \
"$name"
fi
done
'';
system.activationScripts.groups = stringAfter [ "rootPasswd" "binsh" "etc" "var" ]
''
echo "updating groups..."
createGroup() {
name="$1"
gid="$2"
if ! curEnt=$(getent group "$name"); then
groupadd --system \
''${gid:+--gid $gid} \
"$name"
fi
}
${flip concatMapStrings (attrValues config.users.extraGroups) (g: ''
createGroup '${g.name}' '${toString g.gid}'
'')}
'';
};
}
|