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- /* useradd.c - add a new user
- *
- * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
- * Copyright 2013 Kyungwan Han <asura321@gmail.com>
- *
- * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/useradd.html
- USE_USERADD(NEWTOY(useradd, "<1>2u#<0G:s:g:h:SDH", TOYFLAG_NEEDROOT|TOYFLAG_UMASK|TOYFLAG_SBIN))
- USE_USERADD(OLDTOY(adduser, useradd, TOYFLAG_NEEDROOT|TOYFLAG_UMASK|TOYFLAG_SBIN))
- config USERADD
- bool "useradd"
- default n
- help
- usage: useradd [-SDH] [-h DIR] [-s SHELL] [-G GRP] [-g NAME] [-u UID] USER [GROUP]
- Create new user, or add USER to GROUP
- -D Don't assign a password
- -g NAME Real name
- -G GRP Add user to existing group
- -h DIR Home directory
- -H Don't create home directory
- -s SHELL Login shell
- -S Create a system user
- -u UID User id
- */
- #define FOR_useradd
- #include "toys.h"
- GLOBALS(
- char *dir;
- char *gecos;
- char *shell;
- char *u_grp;
- long uid;
- long gid;
- )
- void useradd_main(void)
- {
- char *s = *toys.optargs, *entry;
- struct passwd pwd;
- // Act like groupadd?
- if (toys.optc == 2) {
- if (toys.optflags) help_exit("options with USER GROUP");
- xexec((char *[]){"groupadd", toys.optargs[0], toys.optargs[1], 0});
- }
- // Sanity check user to add
- if (s[strcspn(s, ":/\n")] || strlen(s) > LOGIN_NAME_MAX)
- error_exit("bad username");
- // race condition: two adds at same time?
- if (getpwnam(s)) error_exit("'%s' in use", s);
- // Add a new group to the system, if UID is given then that is validated
- // to be free, else a free UID is choosen by self.
- // SYSTEM IDs are considered in the range 100 ... 999
- // add_user(), add a new entry in /etc/passwd, /etc/shadow files
- pwd.pw_name = s;
- pwd.pw_passwd = "x";
- pwd.pw_gecos = TT.gecos ? TT.gecos : "Linux User,";
- pwd.pw_dir = TT.dir ? TT.dir : xmprintf("/home/%s", *toys.optargs);
- if (!TT.shell) {
- TT.shell = getenv("SHELL");
- if (!TT.shell) {
- struct passwd *pw = getpwuid(getuid());
- if (pw && pw->pw_shell && *pw->pw_shell) TT.shell = xstrdup(pw->pw_shell);
- else TT.shell = "/bin/sh";
- }
- }
- pwd.pw_shell = TT.shell;
- if (toys.optflags & FLAG_u) {
- if (TT.uid > INT_MAX) error_exit("bad uid");
- if (getpwuid(TT.uid)) error_exit("uid '%ld' in use", TT.uid);
- } else {
- if (toys.optflags & FLAG_S) TT.uid = CFG_TOYBOX_UID_SYS;
- else TT.uid = CFG_TOYBOX_UID_USR;
- //find unused uid
- while (getpwuid(TT.uid)) TT.uid++;
- }
- pwd.pw_uid = TT.uid;
- if (toys.optflags & FLAG_G) TT.gid = xgetgrnam(TT.u_grp)->gr_gid;
- else {
- // Set the GID for the user, if not specified
- if (toys.optflags & FLAG_S) TT.gid = CFG_TOYBOX_UID_SYS;
- else TT.gid = CFG_TOYBOX_UID_USR;
- if (getgrnam(pwd.pw_name)) error_exit("group '%s' in use", pwd.pw_name);
- //find unused gid
- while (getgrgid(TT.gid)) TT.gid++;
- }
- pwd.pw_gid = TT.gid;
- // Create a new group for user
- if (!(toys.optflags & FLAG_G)) {
- char *s = xmprintf("-g%ld", (long)pwd.pw_gid);
- if (xrun((char *[]){"groupadd", *toys.optargs, s, 0}))
- error_msg("addgroup -g%ld fail", (long)pwd.pw_gid);
- free(s);
- }
- /*add user to system
- * 1. add an entry to /etc/passwd and /etcshadow file
- * 2. Copy /etc/skel dir contents to use home dir
- * 3. update the user passwd by running 'passwd' utility
- */
- // 1. add an entry to /etc/passwd and /etc/shadow file
- entry = xmprintf("%s:%s:%ld:%ld:%s:%s:%s", pwd.pw_name, pwd.pw_passwd,
- (long)pwd.pw_uid, (long)pwd.pw_gid, pwd.pw_gecos, pwd.pw_dir,
- pwd.pw_shell);
- if (update_password("/etc/passwd", pwd.pw_name, entry)) error_exit("updating passwd file failed");
- free(entry);
- if (toys.optflags & FLAG_S)
- entry = xmprintf("%s:!!:%u::::::", pwd.pw_name,
- (unsigned)(time(NULL))/(24*60*60)); //passwd is not set initially
- else entry = xmprintf("%s:!!:%u:0:99999:7:::", pwd.pw_name,
- (unsigned)(time(0))/(24*60*60)); //passwd is not set initially
- update_password("/etc/shadow", pwd.pw_name, entry);
- free(entry);
- // create home dir & copy skel dir to home
- if (!(toys.optflags & (FLAG_S|FLAG_H))) {
- char *skel = "/etc/skel", *p = pwd.pw_dir;
- // Copy and change ownership
- if (access(p, F_OK)) {
- if (!access(skel, R_OK))
- toys.exitval = xrun((char *[]){"cp", "-R", skel, p, 0});
- else toys.exitval = xrun((char *[]){"mkdir", "-p", p, 0});
- if (!toys.exitval)
- toys.exitval |= xrun((char *[]){"chown", "-R",
- xmprintf("%lu:%lu", TT.uid, TT.gid), p, 0});
- wfchmodat(AT_FDCWD, p, 0700);
- } else fprintf(stderr, "'%s' exists, not copying '%s'", p, skel);
- }
- //3. update the user passwd by running 'passwd' utility
- if (!(toys.optflags & FLAG_D))
- if (xrun((char *[]){"passwd", pwd.pw_name, 0})) error_exit("passwd");
- if (toys.optflags & FLAG_G) {
- /*add user to the existing group, invoke addgroup command */
- if (xrun((char *[]){"groupadd", *toys.optargs, TT.u_grp, 0}))
- error_exit("groupadd");
- }
- }
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