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 the GPL v2 or later, see the file LICENSE in this tarball.
13 #define OPT_DONT_SET_PASS (1 << 4)
14 #define OPT_DONT_MAKE_HOME (1 << 6)
18 /* EDR recoded such that the uid may be passed in *p */
19 static int passwd_study(const char *filename, struct passwd *p)
21 enum { min = 500, max = 65000 };
23 /* We are using reentrant fgetpwent_r() in order to avoid
24 * pulling in static buffers from libc (think static build here) */
27 struct passwd *result;
29 passwd = xfopen(filename, "r");
31 /* EDR if uid is out of bounds, set to min */
32 if ((p->pw_uid > max) || (p->pw_uid < min))
36 * make sure login isn't taken;
37 * find free uid and gid;
39 while (!fgetpwent_r(passwd, &pw, buffer, sizeof(buffer), &result)) {
40 if (strcmp(pw.pw_name, p->pw_name) == 0) {
44 if ((pw.pw_uid >= p->pw_uid) && (pw.pw_uid < max)
45 && (pw.pw_uid >= min)) {
46 p->pw_uid = pw.pw_uid + 1;
51 /* EDR check for an already existing gid */
52 while (getgrgid(p->pw_uid) != NULL)
55 /* EDR also check for an existing group definition */
56 if (getgrnam(p->pw_name) != NULL)
59 /* EDR create new gid always = uid */
60 p->pw_gid = p->pw_uid;
63 /* EDR bounds check */
64 if ((p->pw_uid > max) || (p->pw_uid < min))
71 static void addgroup_wrapper(struct passwd *p)
75 cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
80 static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
82 static void passwd_wrapper(const char *login)
84 static const char prog[] = "passwd";
85 BB_EXECLP(prog, prog, login, NULL);
86 bb_error_msg_and_die("failed to execute '%s', you must set the password for '%s' manually", prog, login);
89 /* putpwent(3) remix */
90 static int adduser(struct passwd *p)
93 int addgroup = !p->pw_gid;
95 /* make sure everything is kosher and setup uid && gid */
96 file = xfopen(bb_path_passwd_file, "a");
97 fseek(file, 0, SEEK_END);
99 switch (passwd_study(bb_path_passwd_file, p)) {
101 bb_error_msg_and_die("%s: login already in use", p->pw_name);
103 bb_error_msg_and_die("illegal uid or no uids left");
105 bb_error_msg_and_die("%s: group name already in use", p->pw_name);
109 if (putpwent(p, file) == -1) {
110 bb_perror_nomsg_and_die();
112 if (ENABLE_FEATURE_CLEAN_UP)
115 #if ENABLE_FEATURE_SHADOWPASSWDS
116 /* add to shadow if necessary */
117 file = fopen_or_warn(bb_path_shadow_file, "a");
119 fseek(file, 0, SEEK_END);
120 fprintf(file, "%s:!:%ld:%d:%d:%d:::\n",
121 p->pw_name, /* username */
122 time(NULL) / 86400, /* sp->sp_lstchg */
124 99999, /* sp->sp_max */
125 7); /* sp->sp_warn */
126 if (ENABLE_FEATURE_CLEAN_UP)
132 /* addgroup should be responsible for dealing w/ gshadow */
133 /* if using a pre-existing group, don't create one */
134 if (addgroup) addgroup_wrapper(p);
136 /* Clear the umask for this process so it doesn't
137 * * screw up the permissions on the mkdir and chown. */
139 if (!(option_mask32 & OPT_DONT_MAKE_HOME)) {
140 /* Set the owner and group so it is owned by the new user,
141 then fix up the permissions to 2755. Can't do it before
142 since chown will clear the setgid bit */
143 if (mkdir(p->pw_dir, 0755)
144 || chown(p->pw_dir, p->pw_uid, p->pw_gid)
145 || chmod(p->pw_dir, 02755)) {
146 bb_perror_msg("%s", p->pw_dir);
150 if (!(option_mask32 & OPT_DONT_SET_PASS)) {
151 /* interactively set passwd */
152 passwd_wrapper(p->pw_name);
159 * adduser will take a login_name as its first parameter.
165 * can be customized via command-line parameters.
167 int adduser_main(int argc, char **argv);
168 int adduser_main(int argc, char **argv)
171 const char *usegroup = NULL;
175 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
178 pw.pw_gecos = (char *)"Linux User,,,";
179 pw.pw_shell = (char *)DEFAULT_SHELL;
182 /* check for min, max and missing args and exit on error */
183 opt_complementary = "-1:?1:?";
184 getopt32(argc, argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
186 /* create string for $HOME if not specified already */
188 snprintf(bb_common_bufsiz1, BUFSIZ, "/home/%s", argv[optind]);
189 pw.pw_dir = bb_common_bufsiz1;
192 /* create a passwd struct */
193 pw.pw_name = argv[optind];
194 pw.pw_passwd = (char *)"x";
196 pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */