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 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <sys/param.h>
34 #include <sys/types.h>
39 /* structs __________________________ */
46 /* data _____________________________ */
48 /* defaults : should this be in an external file? */
49 static const char default_passwd[] = "x";
50 static const char default_gecos[] = "Linux User,,,";
51 static const char default_home_prefix[] = "/home";
52 static const char default_shell[] = "/bin/sh";
54 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
56 static int shadow_enabled = 0;
60 /* EDR recoded such that the uid may be passed in *p */
61 static int passwd_study(const char *filename, struct passwd *p)
67 const int max = 65000;
69 passwd = wfopen(filename, "r");
73 /* EDR if uid is out of bounds, set to min */
74 if ((p->pw_uid > max) || (p->pw_uid < min))
78 * make sure login isn't taken;
79 * find free uid and gid;
81 while ((pw = fgetpwent(passwd))) {
82 if (strcmp(pw->pw_name, p->pw_name) == 0) {
86 if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
87 && (pw->pw_uid >= min)) {
88 p->pw_uid = pw->pw_uid + 1;
92 /* EDR check for an already existing gid */
93 while (getgrgid(p->pw_uid) != NULL)
96 /* EDR also check for an existing group definition */
97 if (getgrnam(p->pw_name) != NULL)
100 /* EDR bounds check */
101 if ((p->pw_uid > max) || (p->pw_uid < min))
104 /* EDR create new gid always = uid */
105 p->pw_gid = p->pw_uid;
111 static void addgroup_wrapper(const char *login, gid_t gid)
115 bb_asprintf(&cmd, "addgroup -g %d %s", gid, login);
120 static void passwd_wrapper(const char *login) __attribute__ ((noreturn));
122 static void passwd_wrapper(const char *login)
124 static const char prog[] = "passwd";
125 execlp(prog, prog, login, NULL);
126 error_msg_and_die("Failed to execute '%s', you must set the password for '%s' manually", prog, login);
129 /* putpwent(3) remix */
130 static int adduser(const char *filename, struct passwd *p)
134 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
139 /* make sure everything is kosher and setup uid && gid */
140 passwd = wfopen(filename, "a");
141 if (passwd == NULL) {
144 fseek(passwd, 0, SEEK_END);
146 /* if (passwd_study(filename, p) == 0) { */
147 r = passwd_study(filename, p);
150 error_msg("%s: login already in use", p->pw_name);
152 error_msg("illegal uid or no uids left");
154 error_msg("group name %s already in use", p->pw_name);
156 error_msg("generic error.");
161 if (putpwent(p, passwd) == -1) {
166 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
167 /* add to shadow if necessary */
168 if (shadow_enabled) {
169 shadow = wfopen(shadow_file, "a");
170 if (shadow == NULL) {
173 fseek(shadow, 0, SEEK_END);
175 sp->sp_max = 99999; /* debianish */
177 fprintf(shadow, "%s:!:%ld:%ld:%ld:%ld:::\n",
178 sp->sp_namp, sp->sp_lstchg, sp->sp_min, sp->sp_max,
185 /* addgroup should be responsible for dealing w/ gshadow */
186 addgroup_wrapper(p->pw_name, p->pw_gid);
188 /* Clear the umask for this process so it doesn't
189 * * screw up the permissions on the mkdir and chown. */
193 if (mkdir(p->pw_dir, 0755)) {
194 perror_msg("%s", p->pw_dir);
196 /* Set the owner and group so it is owned by the new user. */
197 if (chown(p->pw_dir, p->pw_uid, p->pw_gid)) {
198 perror_msg("%s", p->pw_dir);
200 /* Now fix up the permissions to 2755. Can't do it before now
201 * since chown will clear the setgid bit */
202 if (chmod(p->pw_dir, 02755)) {
203 perror_msg("%s", p->pw_dir);
205 /* interactively set passwd */
206 passwd_wrapper(p->pw_name);
210 /* return current uid (root is always uid == 0, right?) */
211 static inline uid_t i_am_not_root(void)
217 * adduser will take a login_name as its first parameter.
223 * can be customized via command-line parameters.
224 * ________________________________________________________________________ */
225 int adduser_main(int argc, char **argv)
230 const char *home = NULL;
239 gecos = default_gecos;
240 shell = default_shell;
243 while ((opt = getopt (argc, argv, "h:g:s:")) != -1)
260 if (i_am_not_root()) {
261 error_msg_and_die( "Only root may add a user or group to the system.");
265 if (optind >= argc) {
266 error_msg_and_die( "no user specified");
268 login = argv[optind];
270 /* create string for $HOME if not specified already */
272 home = concat_path_file(default_home_prefix, login);
274 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
275 /* is /etc/shadow in use? */
276 shadow_enabled = (0 == access(shadow_file, F_OK));
279 /* create a passwd struct */
280 pw.pw_name = (char *)login;
281 pw.pw_passwd = (char *)default_passwd;
284 pw.pw_gecos = (char *)gecos;
285 pw.pw_dir = (char *)home;
286 pw.pw_shell = (char *)shell;
289 return adduser(passwd_file, &pw);
292 /* $Id: adduser.c,v 1.4 2002/09/16 06:22:24 andersen Exp $ */