mirror of
https://github.com/sheumann/hush.git
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179 lines
4.7 KiB
C
179 lines
4.7 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 the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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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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/* 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;
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if (getpwnam(p->pw_name))
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bb_error_msg_and_die("login '%s' is in use", p->pw_name);
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if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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p->pw_uid = 0;
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max = 999;
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} else {
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p->pw_uid = 1000;
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max = 64999;
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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 && getgrgid(p->pw_uid)))
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p->pw_uid++;
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if (!p->pw_gid) {
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/* new gid = uid */
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p->pw_gid = p->pw_uid;
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if (getgrnam(p->pw_name))
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bb_error_msg_and_die("group name '%s' is in use", p->pw_name);
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}
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if (p->pw_uid > max)
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bb_error_msg_and_die("no free uids left");
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}
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static void addgroup_wrapper(struct passwd *p)
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{
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char *cmd;
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cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name);
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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) ATTRIBUTE_NORETURN;
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static void passwd_wrapper(const char *login)
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{
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static const char prog[] ALIGN1 = "passwd";
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BB_EXECLP(prog, prog, login, NULL);
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bb_error_msg_and_die("cannot execute %s, you must set password manually", prog);
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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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;
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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 ATTRIBUTE_UNUSED, 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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FILE *file;
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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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opt_complementary = "=1";
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getopt32(argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
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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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pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* 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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/* add to passwd */
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file = xfopen(bb_path_passwd_file, "a");
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//fseek(file, 0, SEEK_END); /* paranoia, "a" should ensure that anyway */
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if (putpwent(&pw, file) != 0) {
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bb_perror_nomsg_and_die();
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}
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/* do fclose even if !ENABLE_FEATURE_CLEAN_UP.
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* We will exec passwd, files must be flushed & closed before that! */
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fclose(file);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* add to shadow if necessary */
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file = fopen_or_warn(bb_path_shadow_file, "a");
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if (file) {
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//fseek(file, 0, SEEK_END);
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fprintf(file, "%s:!:%u:0:99999:7:::\n",
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pw.pw_name, /* username */
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(unsigned)(time(NULL) / 86400) /* sp->sp_lstchg */
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/*0,*/ /* sp->sp_min */
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/*99999,*/ /* sp->sp_max */
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/*7*/ /* sp->sp_warn */
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);
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fclose(file);
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}
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#endif
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/* add to group */
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/* addgroup should be responsible for dealing w/ gshadow */
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/* if using a pre-existing group, don't create one */
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if (!usegroup)
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addgroup_wrapper(&pw);
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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 (!(option_mask32 & 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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if (mkdir(pw.pw_dir, 0755)
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|| chown(pw.pw_dir, pw.pw_uid, pw.pw_gid)
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|| chmod(pw.pw_dir, 02755) /* 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 (!(option_mask32 & 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 0;
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}
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