231 lines
6.9 KiB
C
231 lines
6.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* adduser - add users to /etc/passwd and /etc/shadow
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
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#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
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#endif
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/* #define OPT_HOME (1 << 0) */ /* unused */
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/* #define OPT_GECOS (1 << 1) */ /* unused */
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#define OPT_SHELL (1 << 2)
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#define OPT_GID (1 << 3)
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#define OPT_DONT_SET_PASS (1 << 4)
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#define OPT_SYSTEM_ACCOUNT (1 << 5)
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#define OPT_DONT_MAKE_HOME (1 << 6)
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#define OPT_UID (1 << 7)
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/* We assume UID_T_MAX == INT_MAX */
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/* remix */
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/* recoded such that the uid may be passed in *p */
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static void passwd_study(struct passwd *p)
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{
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int max = UINT_MAX;
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if (getpwnam(p->pw_name)) {
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bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name);
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/* this format string is reused in adduser and addgroup */
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}
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if (!(option_mask32 & OPT_UID)) {
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if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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p->pw_uid = CONFIG_FIRST_SYSTEM_ID;
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max = CONFIG_LAST_SYSTEM_ID;
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} else {
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p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1;
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max = 64999;
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}
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}
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/* check for a free uid (and maybe gid) */
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while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) {
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if (option_mask32 & OPT_UID) {
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/* -u N, cannot pick uid other than N: error */
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bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid));
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/* this format string is reused in adduser and addgroup */
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}
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if (p->pw_uid == max) {
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bb_error_msg_and_die("no %cids left", 'u');
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}
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p->pw_uid++;
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}
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if (p->pw_gid == (gid_t)-1) {
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p->pw_gid = p->pw_uid; /* new gid = uid */
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if (getgrnam(p->pw_name)) {
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bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name);
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/* this format string is reused in adduser and addgroup */
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}
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}
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}
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static void addgroup_wrapper(struct passwd *p, const char *group_name)
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{
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char *cmd;
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if (group_name) /* Add user to existing group */
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cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name);
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else /* Add user to his own group with the first free gid found in passwd_study */
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cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
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/* Warning: to be compatible with external addgroup programs we should use --gid instead */
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system(cmd);
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free(cmd);
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}
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static void passwd_wrapper(const char *login_name) NORETURN;
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static void passwd_wrapper(const char *login_name)
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{
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BB_EXECLP("passwd", "passwd", login_name, NULL);
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bb_error_msg_and_die("can't execute passwd, you must set password manually");
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}
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#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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static const char adduser_longopts[] ALIGN1 =
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"home\0" Required_argument "h"
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"gecos\0" Required_argument "g"
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"shell\0" Required_argument "s"
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"ingroup\0" Required_argument "G"
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"disabled-password\0" No_argument "D"
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"empty-password\0" No_argument "D"
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"system\0" No_argument "S"
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"no-create-home\0" No_argument "H"
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"uid\0" Required_argument "u"
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;
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#endif
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/*
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* adduser will take a login_name as its first parameter.
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* home, shell, gecos:
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* can be customized via command-line parameters.
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*/
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int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int adduser_main(int argc UNUSED_PARAM, char **argv)
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{
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struct passwd pw;
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const char *usegroup = NULL;
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char *p;
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unsigned opts;
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#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS
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applet_long_options = adduser_longopts;
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#endif
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/* got root? */
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if (geteuid()) {
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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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}
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pw.pw_gecos = (char *)"Linux User,,,";
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pw.pw_shell = (char *)DEFAULT_SHELL;
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pw.pw_dir = NULL;
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/* exactly one non-option arg */
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/* disable interactive passwd for system accounts */
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opt_complementary = "=1:SD:u+";
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if (sizeof(pw.pw_uid) == sizeof(int)) {
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opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid);
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} else {
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unsigned uid;
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opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid);
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if (opts & OPT_UID) {
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pw.pw_uid = uid;
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}
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}
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argv += optind;
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/* fill in the passwd struct */
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pw.pw_name = argv[0];
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die_if_bad_username(pw.pw_name);
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if (!pw.pw_dir) {
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/* create string for $HOME if not specified already */
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pw.pw_dir = xasprintf("/home/%s", argv[0]);
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}
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pw.pw_passwd = (char *)"x";
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if (opts & OPT_SYSTEM_ACCOUNT) {
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if (!usegroup) {
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usegroup = "nogroup";
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}
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if (!(opts & OPT_SHELL)) {
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pw.pw_shell = (char *) "/bin/false";
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}
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}
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pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */
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/* make sure everything is kosher and setup uid && maybe gid */
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passwd_study(&pw);
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p = xasprintf("x:%u:%u:%s:%s:%s",
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(unsigned) pw.pw_uid, (unsigned) pw.pw_gid,
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pw.pw_gecos, pw.pw_dir, pw.pw_shell);
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if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) {
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return EXIT_FAILURE;
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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free(p);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* /etc/shadow fields:
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* 1. username
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* 2. encrypted password
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* 3. last password change (unix date (unix time/24*60*60))
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* 4. minimum days required between password changes
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* 5. maximum days password is valid
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* 6. days before password is to expire that user is warned
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* 7. days after password expires that account is disabled
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* 8. unix date when login expires (i.e. when it may no longer be used)
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*/
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/* fields: 2 3 4 5 6 78 */
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p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));
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/* ignore errors: if file is missing we suppose admin doesn't want it */
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update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(p);
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#endif
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/* add to group */
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addgroup_wrapper(&pw, usegroup);
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/* clear the umask for this process so it doesn't
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* screw up the permissions on the mkdir and chown. */
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umask(0);
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if (!(opts & OPT_DONT_MAKE_HOME)) {
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/* set the owner and group so it is owned by the new user,
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* then fix up the permissions to 2755. Can't do it before
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* since chown will clear the setgid bit */
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int mkdir_err = mkdir(pw.pw_dir, 0755);
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if (mkdir_err == 0) {
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/* New home. Copy /etc/skel to it */
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const char *args[] = {
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"chown", "-R",
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xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid),
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pw.pw_dir, NULL
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};
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/* Be silent on any errors (like: no /etc/skel) */
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logmode = LOGMODE_NONE;
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copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR);
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logmode = LOGMODE_STDIO;
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chown_main(4, (char**)args);
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}
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if ((mkdir_err != 0 && errno != EEXIST)
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|| chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0
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|| chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */
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) {
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bb_simple_perror_msg(pw.pw_dir);
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}
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}
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if (!(opts & OPT_DONT_SET_PASS)) {
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/* interactively set passwd */
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passwd_wrapper(pw.pw_name);
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}
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return EXIT_SUCCESS;
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}
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