diff options
Diffstat (limited to 'loginutils/adduser.c')
| -rw-r--r-- | loginutils/adduser.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/loginutils/adduser.c b/loginutils/adduser.c new file mode 100644 index 0000000..3154806 --- /dev/null +++ b/loginutils/adduser.c @@ -0,0 +1,178 @@ +/* vi: set sw=4 ts=4: */ +/* + * adduser - add users to /etc/passwd and /etc/shadow + * + * Copyright (C) 1999 by Lineo, inc. and John Beppu + * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> + * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. + */ + +#include "libbb.h" + +#define OPT_DONT_SET_PASS (1 << 4) +#define OPT_SYSTEM_ACCOUNT (1 << 5) +#define OPT_DONT_MAKE_HOME (1 << 6) + + +/* remix */ +/* recoded such that the uid may be passed in *p */ +static void passwd_study(struct passwd *p) +{ + int max; + + if (getpwnam(p->pw_name)) + bb_error_msg_and_die("login '%s' is in use", p->pw_name); + + if (option_mask32 & OPT_SYSTEM_ACCOUNT) { + p->pw_uid = 0; + max = 999; + } else { + p->pw_uid = 1000; + max = 64999; + } + + /* check for a free uid (and maybe gid) */ + while (getpwuid(p->pw_uid) || (!p->pw_gid && getgrgid(p->pw_uid))) + p->pw_uid++; + + if (!p->pw_gid) { + /* new gid = uid */ + p->pw_gid = p->pw_uid; + if (getgrnam(p->pw_name)) + bb_error_msg_and_die("group name '%s' is in use", p->pw_name); + } + + if (p->pw_uid > max) + bb_error_msg_and_die("no free uids left"); +} + +static void addgroup_wrapper(struct passwd *p) +{ + char *cmd; + + cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name); + system(cmd); + free(cmd); +} + +static void passwd_wrapper(const char *login) NORETURN; + +static void passwd_wrapper(const char *login) +{ + static const char prog[] ALIGN1 = "passwd"; + + BB_EXECLP(prog, prog, login, NULL); + bb_error_msg_and_die("cannot execute %s, you must set password manually", prog); +} + +#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS +static const char adduser_longopts[] ALIGN1 = + "home\0" Required_argument "h" + "gecos\0" Required_argument "g" + "shell\0" Required_argument "s" + "ingroup\0" Required_argument "G" + "disabled-password\0" No_argument "D" + "empty-password\0" No_argument "D" + "system\0" No_argument "S" + "no-create-home\0" No_argument "H" + ; +#endif + +/* + * adduser will take a login_name as its first parameter. + * home, shell, gecos: + * can be customized via command-line parameters. + */ +int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int adduser_main(int argc UNUSED_PARAM, char **argv) +{ + struct passwd pw; + const char *usegroup = NULL; + FILE *file; + +#if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS + applet_long_options = adduser_longopts; +#endif + + /* got root? */ + if (geteuid()) { + bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); + } + + pw.pw_gecos = (char *)"Linux User,,,"; + pw.pw_shell = (char *)DEFAULT_SHELL; + pw.pw_dir = NULL; + + /* exactly one non-option arg */ + opt_complementary = "=1"; + getopt32(argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup); + argv += optind; + + /* fill in the passwd struct */ + pw.pw_name = argv[0]; + die_if_bad_username(pw.pw_name); + if (!pw.pw_dir) { + /* create string for $HOME if not specified already */ + pw.pw_dir = xasprintf("/home/%s", argv[0]); + } + pw.pw_passwd = (char *)"x"; + pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */ + + /* make sure everything is kosher and setup uid && maybe gid */ + passwd_study(&pw); + + /* add to passwd */ + file = xfopen(bb_path_passwd_file, "a"); + //fseek(file, 0, SEEK_END); /* paranoia, "a" should ensure that anyway */ + if (putpwent(&pw, file) != 0) { + bb_perror_nomsg_and_die(); + } + /* do fclose even if !ENABLE_FEATURE_CLEAN_UP. + * We will exec passwd, files must be flushed & closed before that! */ + fclose(file); + +#if ENABLE_FEATURE_SHADOWPASSWDS + /* add to shadow if necessary */ + file = fopen_or_warn(bb_path_shadow_file, "a"); + if (file) { + //fseek(file, 0, SEEK_END); + fprintf(file, "%s:!:%u:0:99999:7:::\n", + pw.pw_name, /* username */ + (unsigned)(time(NULL) / 86400) /* sp->sp_lstchg */ + /*0,*/ /* sp->sp_min */ + /*99999,*/ /* sp->sp_max */ + /*7*/ /* sp->sp_warn */ + ); + fclose(file); + } +#endif + + /* add to group */ + /* addgroup should be responsible for dealing w/ gshadow */ + /* if using a pre-existing group, don't create one */ + if (!usegroup) + addgroup_wrapper(&pw); + + /* Clear the umask for this process so it doesn't + * screw up the permissions on the mkdir and chown. */ + umask(0); + if (!(option_mask32 & OPT_DONT_MAKE_HOME)) { + /* Set the owner and group so it is owned by the new user, + then fix up the permissions to 2755. Can't do it before + since chown will clear the setgid bit */ + if (mkdir(pw.pw_dir, 0755) + || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) + || chmod(pw.pw_dir, 02755) /* set setgid bit on homedir */ + ) { + bb_simple_perror_msg(pw.pw_dir); + } + } + + if (!(option_mask32 & OPT_DONT_SET_PASS)) { + /* interactively set passwd */ + passwd_wrapper(pw.pw_name); + } + + return 0; +} |