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.
12 #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
13 #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
16 /* #define OPT_HOME (1 << 0) */ /* unused */
17 /* #define OPT_GECOS (1 << 1) */ /* unused */
18 #define OPT_SHELL (1 << 2)
19 #define OPT_GID (1 << 3)
20 #define OPT_DONT_SET_PASS (1 << 4)
21 #define OPT_SYSTEM_ACCOUNT (1 << 5)
22 #define OPT_DONT_MAKE_HOME (1 << 6)
23 #define OPT_UID (1 << 7)
25 /* We assume UID_T_MAX == INT_MAX */
27 /* recoded such that the uid may be passed in *p */
28 static void passwd_study(struct passwd *p)
32 if (getpwnam(p->pw_name)) {
33 bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
34 /* this format string is reused in adduser and addgroup */
37 if (!(option_mask32 & OPT_UID)) {
38 if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
39 p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
40 max = CONFIG_LAST_SYSTEM_ID;
42 p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
46 /* check for a free uid (and maybe gid) */
47 while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
48 if (option_mask32 & OPT_UID) {
49 /* -u N, cannot pick uid other than N: error */
50 bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
51 /* this format string is reused in adduser and addgroup */
53 if (p->pw_uid == max) {
54 bb_error_msg_and_die("no %cids left", 'u');
59 if (p->pw_gid == (gid_t)-1) {
60 p->pw_gid = p->pw_uid; /* new gid = uid */
61 if (getgrnam(p->pw_name)) {
62 bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
63 /* this format string is reused in adduser and addgroup */
68 static void addgroup_wrapper(struct passwd *p, const char *group_name)
72 argv[0] = (char*)"addgroup";
74 /* Add user to existing group */
76 argv[2] = (char*)group_name;
79 /* Add user to his own group with the first free gid found in passwd_study */
80 //TODO: to be compatible with external addgroup programs we should use --gid instead...
81 argv[1] = (char*)"-g";
82 argv[2] = utoa(p->pw_gid);
90 static void passwd_wrapper(const char *login_name) NORETURN;
92 static void passwd_wrapper(const char *login_name)
94 BB_EXECLP("passwd", "passwd", login_name, NULL);
95 bb_error_msg_and_die("can't execute passwd, you must set password manually");
98 #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
99 static const char adduser_longopts[] ALIGN1 =
100 "home\0" Required_argument "h"
101 "gecos\0" Required_argument "g"
102 "shell\0" Required_argument "s"
103 "ingroup\0" Required_argument "G"
104 "disabled-password\0" No_argument "D"
105 "empty-password\0" No_argument "D"
106 "system\0" No_argument "S"
107 "no-create-home\0" No_argument "H"
108 "uid\0" Required_argument "u"
113 * adduser will take a login_name as its first parameter.
114 * home, shell, gecos:
115 * can be customized via command-line parameters.
117 int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
118 int adduser_main(int argc UNUSED_PARAM, char **argv)
121 const char *usegroup = NULL;
125 #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
126 applet_long_options = adduser_longopts;
131 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
134 pw.pw_gecos = (char *)"Linux User,,,";
135 /* We assume that newly created users "inherit" root's shell setting */
136 pw.pw_shell = (char *)get_shell_name();
139 /* exactly one non-option arg */
140 /* disable interactive passwd for system accounts */
141 opt_complementary = "=1:SD:u+";
142 if (sizeof(pw.pw_uid) == sizeof(int)) {
143 opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid);
146 opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid);
147 if (opts & OPT_UID) {
153 /* fill in the passwd struct */
154 pw.pw_name = argv[0];
155 die_if_bad_username(pw.pw_name);
157 /* create string for $HOME if not specified already */
158 pw.pw_dir = xasprintf("/home/%s", argv[0]);
160 pw.pw_passwd = (char *)"x";
161 if (opts & OPT_SYSTEM_ACCOUNT) {
163 usegroup = "nogroup";
165 if (!(opts & OPT_SHELL)) {
166 pw.pw_shell = (char *) "/bin/false";
169 pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
171 /* make sure everything is kosher and setup uid && maybe gid */
174 p = xasprintf("x:%u:%u:%s:%s:%s",
175 (unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
176 pw.pw_gecos, pw.pw_dir, pw.pw_shell);
177 if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
180 if (ENABLE_FEATURE_CLEAN_UP)
183 #if ENABLE_FEATURE_SHADOWPASSWDS
184 /* /etc/shadow fields:
186 * 2. encrypted password
187 * 3. last password change (unix date (unix time/24*60*60))
188 * 4. minimum days required between password changes
189 * 5. maximum days password is valid
190 * 6. days before password is to expire that user is warned
191 * 7. days after password expires that account is disabled
192 * 8. unix date when login expires (i.e. when it may no longer be used)
194 /* fields: 2 3 4 5 6 78 */
195 p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));
196 /* ignore errors: if file is missing we suppose admin doesn't want it */
197 update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
198 if (ENABLE_FEATURE_CLEAN_UP)
203 addgroup_wrapper(&pw, usegroup);
205 /* clear the umask for this process so it doesn't
206 * screw up the permissions on the mkdir and chown. */
208 if (!(opts & OPT_DONT_MAKE_HOME)) {
209 /* set the owner and group so it is owned by the new user,
210 * then fix up the permissions to 2755. Can't do it before
211 * since chown will clear the setgid bit */
212 int mkdir_err = mkdir(pw.pw_dir, 0755);
213 if (mkdir_err == 0) {
214 /* New home. Copy /etc/skel to it */
215 const char *args[] = {
217 xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
220 /* Be silent on any errors (like: no /etc/skel) */
221 logmode = LOGMODE_NONE;
222 copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR);
223 logmode = LOGMODE_STDIO;
224 chown_main(4, (char**)args);
226 if ((mkdir_err != 0 && errno != EEXIST)
227 || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
228 || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
230 bb_simple_perror_msg(pw.pw_dir);
234 if (!(opts & OPT_DONT_SET_PASS)) {
235 /* interactively set passwd */
236 passwd_wrapper(pw.pw_name);