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 #define PASSWD_FILE "/etc/passwd"
40 #define SHADOW_FILE "/etc/shadow"
43 /* structs __________________________ */
50 /* data _____________________________ */
52 /* defaults : should this be in an external file? */
53 static const char default_passwd[] = "x";
54 static const char default_gecos[] = "Linux User,,,";
55 static const char default_home_prefix[] = "/home";
56 static const char default_shell[] = "/bin/sh";
58 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
63 static int shadow_enabled = 0;
67 /* EDR recoded such that the uid may be passed in *p */
68 static int passwd_study(const char *filename, struct passwd *p)
74 const int max = 65000;
76 passwd = wfopen(filename, "r");
80 /* EDR if uid is out of bounds, set to min */
81 if ((p->pw_uid > max) || (p->pw_uid < min))
85 * make sure login isn't taken;
86 * find free uid and gid;
88 while ((pw = fgetpwent(passwd))) {
89 if (strcmp(pw->pw_name, p->pw_name) == 0) {
93 if ((pw->pw_uid >= p->pw_uid) && (pw->pw_uid < max)
94 && (pw->pw_uid >= min)) {
95 p->pw_uid = pw->pw_uid + 1;
99 /* EDR check for an already existing gid */
100 while (getgrgid(p->pw_uid) != NULL)
103 /* EDR also check for an existing group definition */
104 if (getgrnam(p->pw_name) != NULL)
107 /* EDR bounds check */
108 if ((p->pw_uid > max) || (p->pw_uid < min))
111 /* EDR create new gid always = uid */
112 p->pw_gid = p->pw_uid;
118 static void addgroup_wrapper(const char *login, gid_t gid)
121 const char *argv0_save;
124 char *argv[] = { group_name, "-g", group_id };
126 argv0_save = applet_name;
127 applet_name = "addgroup";
128 safe_strncpy(group_name, login, 32);
129 sprintf(group_id, "%d", gid);
130 addgroup_main(argc, argv);
131 applet_name = argv0_save;
134 static void passwd_wrapper(const char *login)
136 static const char prog[] = "passwd";
137 execlp(prog, prog, login, NULL);
138 error_msg_and_die("Failed to execute 'passwd', you must set the password for '%s' manually", login);
141 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
143 * pwd_to_spwd - create entries for new spwd structure
145 * pwd_to_spwd() creates a new (struct spwd) containing the
146 * information in the pointed-to (struct passwd).
148 #define DAY (24L*3600L)
151 static struct spwd *pwd_to_spwd(const struct passwd *pw)
153 static struct spwd sp;
156 * Nice, easy parts first. The name and passwd map directly
157 * from the old password structure to the new one.
159 sp.sp_namp = pw->pw_name;
160 sp.sp_pwdp = pw->pw_passwd;
163 * Defaults used if there is no pw_age information.
166 sp.sp_max = (10000L * DAY) / SCALE;
167 sp.sp_lstchg = time((time_t *) 0) / SCALE;
170 * These fields have no corresponding information in the password
171 * file. They are set to uninitialized values.
182 /* putpwent(3) remix */
183 static int adduser(const char *filename, struct passwd *p)
187 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
192 /* make sure everything is kosher and setup uid && gid */
193 passwd = wfopen(filename, "a");
194 if (passwd == NULL) {
198 fseek(passwd, 0, SEEK_END);
200 /* if (passwd_study(filename, p) == 0) { */
201 r = passwd_study(filename, p);
204 error_msg("%s: login already in use", p->pw_name);
206 error_msg("illegal uid or no uids left");
208 error_msg("group name %s already in use", p->pw_name);
210 error_msg("generic error.");
216 if (putpwent(p, passwd) == -1) {
222 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
223 /* add to shadow if necessary */
224 if (shadow_enabled) {
225 shadow = wfopen(SHADOW_FILE, "a");
226 if (shadow == NULL) {
230 fseek(shadow, 0, SEEK_END);
232 sp->sp_max = 99999; /* debianish */
234 fprintf(shadow, "%s:!:%ld:%ld:%ld:%ld:::\n",
235 sp->sp_namp, sp->sp_lstchg, sp->sp_min, sp->sp_max,
242 /* addgroup should be responsible for dealing w/ gshadow */
243 addgroup_wrapper(p->pw_name, p->pw_gid);
245 /* Clear the umask for this process so it doesn't
246 * * screw up the permissions on the mkdir and chown. */
250 if (mkdir(p->pw_dir, 0755)) {
251 perror_msg("%s", p->pw_dir);
253 /* Set the owner and group so it is owned by the new user. */
254 if (chown(p->pw_dir, p->pw_uid, p->pw_gid)) {
255 perror_msg("%s", p->pw_dir);
257 /* Now fix up the permissions to 2755. Can't do it before now
258 * since chown will clear the setgid bit */
259 if (chmod(p->pw_dir, 02755)) {
260 perror_msg("%s", p->pw_dir);
262 /* interactively set passwd */
263 passwd_wrapper(p->pw_name);
269 /* return current uid (root is always uid == 0, right?) */
270 static inline uid_t i_am_not_root(void)
276 * adduser will take a login_name as its first parameter.
282 * can be customized via command-line parameters.
283 * ________________________________________________________________________ */
284 int adduser_main(int argc, char **argv)
290 const char *home = NULL;
299 gecos = default_gecos;
300 shell = default_shell;
303 while ((opt = getopt (argc, argv, "h:g:s:")) != -1)
320 if (i_am_not_root()) {
321 error_msg_and_die( "Only root may add a user or group to the system.");
325 if (optind >= argc) {
326 error_msg_and_die( "no user specified");
328 login = argv[optind];
330 /* create string for $HOME if not specified already */
332 home = concat_path_file(default_home_prefix, login);
334 #ifdef CONFIG_FEATURE_SHADOWPASSWDS
335 /* is /etc/shadow in use? */
336 shadow_enabled = (0 == access(SHADOW_FILE, F_OK));
339 /* create a passwd struct */
340 pw.pw_name = (char *)login;
341 pw.pw_passwd = (char *)default_passwd;
344 pw.pw_gecos = (char *)gecos;
345 pw.pw_dir = (char *)home;
346 pw.pw_shell = (char *)shell;
349 return adduser(PASSWD_FILE, &pw);
352 /* $Id: adduser.c,v 1.1 2002/06/04 20:45:05 sandman Exp $ */