1 /* vi: set sw=4 ts=4: */
3 * adduser - add users to /etc/passwd and /etc/shadow
5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 //usage:#define adduser_trivial_usage
12 //usage: "[OPTIONS] USER"
13 //usage:#define adduser_full_usage "\n\n"
14 //usage: "Add a user\n"
15 //usage: "\n -h DIR Home directory"
16 //usage: "\n -g GECOS GECOS field"
17 //usage: "\n -s SHELL Login shell"
18 //usage: "\n -G GRP Add user to existing group"
19 //usage: "\n -S Create a system user"
20 //usage: "\n -D Don't assign a password"
21 //usage: "\n -H Don't create home directory"
22 //usage: "\n -u UID User id"
26 #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
27 #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
30 /* #define OPT_HOME (1 << 0) */ /* unused */
31 /* #define OPT_GECOS (1 << 1) */ /* unused */
32 #define OPT_SHELL (1 << 2)
33 #define OPT_GID (1 << 3)
34 #define OPT_DONT_SET_PASS (1 << 4)
35 #define OPT_SYSTEM_ACCOUNT (1 << 5)
36 #define OPT_DONT_MAKE_HOME (1 << 6)
37 #define OPT_UID (1 << 7)
39 /* We assume UID_T_MAX == INT_MAX */
41 /* recoded such that the uid may be passed in *p */
42 static void passwd_study(struct passwd
*p
)
46 if (getpwnam(p
->pw_name
)) {
47 bb_error_msg_and_die("%s '%s' in use", "user", p
->pw_name
);
48 /* this format string is reused in adduser and addgroup */
51 if (!(option_mask32
& OPT_UID
)) {
52 if (option_mask32
& OPT_SYSTEM_ACCOUNT
) {
53 p
->pw_uid
= CONFIG_FIRST_SYSTEM_ID
;
54 max
= CONFIG_LAST_SYSTEM_ID
;
56 p
->pw_uid
= CONFIG_LAST_SYSTEM_ID
+ 1;
60 /* check for a free uid (and maybe gid) */
61 while (getpwuid(p
->pw_uid
) || (p
->pw_gid
== (gid_t
)-1 && getgrgid(p
->pw_uid
))) {
62 if (option_mask32
& OPT_UID
) {
63 /* -u N, cannot pick uid other than N: error */
64 bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p
->pw_uid
));
65 /* this format string is reused in adduser and addgroup */
67 if (p
->pw_uid
== max
) {
68 bb_error_msg_and_die("no %cids left", 'u');
69 /* this format string is reused in adduser and addgroup */
74 if (p
->pw_gid
== (gid_t
)-1) {
75 p
->pw_gid
= p
->pw_uid
; /* new gid = uid */
76 if (getgrnam(p
->pw_name
)) {
77 bb_error_msg_and_die("%s '%s' in use", "group", p
->pw_name
);
78 /* this format string is reused in adduser and addgroup */
83 static void addgroup_wrapper(struct passwd
*p
, const char *group_name
)
87 argv
[0] = (char*)"addgroup";
89 /* Add user to existing group */
90 argv
[1] = (char*)"--";
92 argv
[3] = (char*)group_name
;
95 /* Add user to his own group with the first free gid
96 * found in passwd_study.
98 #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS || !ENABLE_ADDGROUP
99 /* We try to use --gid, not -g, because "standard" addgroup
100 * has no short option -g, it has only long --gid.
102 argv
[1] = (char*)"--gid";
104 /* Breaks if system in fact does NOT use busybox addgroup */
105 argv
[1] = (char*)"-g";
107 argv
[2] = utoa(p
->pw_gid
);
108 argv
[3] = (char*)"--";
109 argv
[4] = p
->pw_name
;
113 spawn_and_wait(argv
);
116 static void passwd_wrapper(const char *login_name
) NORETURN
;
118 static void passwd_wrapper(const char *login_name
)
120 BB_EXECLP("passwd", "passwd", "--", login_name
, NULL
);
121 bb_error_msg_and_die("can't execute passwd, you must set password manually");
124 #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
125 static const char adduser_longopts
[] ALIGN1
=
126 "home\0" Required_argument
"h"
127 "gecos\0" Required_argument
"g"
128 "shell\0" Required_argument
"s"
129 "ingroup\0" Required_argument
"G"
130 "disabled-password\0" No_argument
"D"
131 "empty-password\0" No_argument
"D"
132 "system\0" No_argument
"S"
133 "no-create-home\0" No_argument
"H"
134 "uid\0" Required_argument
"u"
139 * adduser will take a login_name as its first parameter.
140 * home, shell, gecos:
141 * can be customized via command-line parameters.
143 int adduser_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
144 int adduser_main(int argc UNUSED_PARAM
, char **argv
)
147 const char *usegroup
= NULL
;
151 #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
152 applet_long_options
= adduser_longopts
;
157 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root
);
160 pw
.pw_gecos
= (char *)"Linux User,,,";
161 /* We assume that newly created users "inherit" root's shell setting */
162 pw
.pw_shell
= (char *)get_shell_name();
165 /* exactly one non-option arg */
166 /* disable interactive passwd for system accounts */
167 opt_complementary
= "=1:SD:u+";
168 if (sizeof(pw
.pw_uid
) == sizeof(int)) {
169 opts
= getopt32(argv
, "h:g:s:G:DSHu:", &pw
.pw_dir
, &pw
.pw_gecos
, &pw
.pw_shell
, &usegroup
, &pw
.pw_uid
);
172 opts
= getopt32(argv
, "h:g:s:G:DSHu:", &pw
.pw_dir
, &pw
.pw_gecos
, &pw
.pw_shell
, &usegroup
, &uid
);
173 if (opts
& OPT_UID
) {
179 /* fill in the passwd struct */
180 pw
.pw_name
= argv
[0];
181 die_if_bad_username(pw
.pw_name
);
183 /* create string for $HOME if not specified already */
184 pw
.pw_dir
= xasprintf("/home/%s", argv
[0]);
186 pw
.pw_passwd
= (char *)"x";
187 if (opts
& OPT_SYSTEM_ACCOUNT
) {
189 usegroup
= "nogroup";
191 if (!(opts
& OPT_SHELL
)) {
192 pw
.pw_shell
= (char *) "/bin/false";
195 pw
.pw_gid
= usegroup
? xgroup2gid(usegroup
) : -1; /* exits on failure */
197 /* make sure everything is kosher and setup uid && maybe gid */
200 p
= xasprintf("x:%u:%u:%s:%s:%s",
201 (unsigned) pw
.pw_uid
, (unsigned) pw
.pw_gid
,
202 pw
.pw_gecos
, pw
.pw_dir
, pw
.pw_shell
);
203 if (update_passwd(bb_path_passwd_file
, pw
.pw_name
, p
, NULL
) < 0) {
206 if (ENABLE_FEATURE_CLEAN_UP
)
209 #if ENABLE_FEATURE_SHADOWPASSWDS
210 /* /etc/shadow fields:
212 * 2. encrypted password
213 * 3. last password change (unix date (unix time/24*60*60))
214 * 4. minimum days required between password changes
215 * 5. maximum days password is valid
216 * 6. days before password is to expire that user is warned
217 * 7. days after password expires that account is disabled
218 * 8. unix date when login expires (i.e. when it may no longer be used)
220 /* fields: 2 3 4 5 6 78 */
221 p
= xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL
)) / (24*60*60));
222 /* ignore errors: if file is missing we suppose admin doesn't want it */
223 update_passwd(bb_path_shadow_file
, pw
.pw_name
, p
, NULL
);
224 if (ENABLE_FEATURE_CLEAN_UP
)
229 addgroup_wrapper(&pw
, usegroup
);
231 /* clear the umask for this process so it doesn't
232 * screw up the permissions on the mkdir and chown. */
234 if (!(opts
& OPT_DONT_MAKE_HOME
)) {
235 /* set the owner and group so it is owned by the new user,
236 * then fix up the permissions to 2755. Can't do it before
237 * since chown will clear the setgid bit */
238 int mkdir_err
= mkdir(pw
.pw_dir
, 0755);
239 if (mkdir_err
== 0) {
240 /* New home. Copy /etc/skel to it */
241 const char *args
[] = {
244 xasprintf("%u:%u", (int)pw
.pw_uid
, (int)pw
.pw_gid
),
248 /* Be silent on any errors (like: no /etc/skel) */
249 logmode
= LOGMODE_NONE
;
250 copy_file("/etc/skel", pw
.pw_dir
, FILEUTILS_RECUR
);
251 logmode
= LOGMODE_STDIO
;
252 chown_main(4, (char**)args
);
254 if ((mkdir_err
!= 0 && errno
!= EEXIST
)
255 || chown(pw
.pw_dir
, pw
.pw_uid
, pw
.pw_gid
) != 0
256 || chmod(pw
.pw_dir
, 02755) != 0 /* set setgid bit on homedir */
258 bb_simple_perror_msg(pw
.pw_dir
);
262 if (!(opts
& OPT_DONT_SET_PASS
)) {
263 /* interactively set passwd */
264 passwd_wrapper(pw
.pw_name
);