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/* vi: set sw=4 ts=4: */ /* * Mini sulogin implementation for busybox * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //usage:#define sulogin_trivial_usage //usage: "[-t N] [TTY]" //usage:#define sulogin_full_usage "\n\n" //usage: "Single user login\n" //usage: "\n -t N Timeout" #include "libbb.h" #include <syslog.h> int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int sulogin_main(int argc UNUSED_PARAM, char **argv) { int timeout = 0; struct passwd *pwd; const char *shell; logmode = LOGMODE_BOTH; openlog(applet_name, 0, LOG_AUTH); opt_complementary = "t+"; /* -t N */ getopt32(argv, "t:", &timeout); argv += optind; if (argv[0]) { close(0); close(1); dup(xopen(argv[0], O_RDWR)); close(2); dup(0); } /* Malicious use like "sulogin /dev/sda"? */ if (!isatty(0) || !isatty(1) || !isatty(2)) { logmode = LOGMODE_SYSLOG; bb_error_msg_and_die("not a tty"); } /* Clear dangerous stuff, set PATH */ sanitize_env_if_suid(); pwd = getpwuid(0); if (!pwd) { goto auth_error; } while (1) { int r; r = ask_and_check_password_extended(pwd, timeout, "Give root password for system maintenance\n" "(or type Control-D for normal startup):" ); if (r < 0) { /* ^D, ^C, timeout, or read error */ bb_info_msg("Normal startup"); return 0; } if (r > 0) { break; } bb_do_delay(LOGIN_FAIL_DELAY); bb_info_msg("Login incorrect"); } bb_info_msg("System Maintenance Mode"); IF_SELINUX(renew_current_security_context()); shell = getenv("SUSHELL"); if (!shell) shell = getenv("sushell"); if (!shell) shell = pwd->pw_shell; /* Exec login shell with no additional parameters. Never returns. */ run_shell(shell, 1, NULL, NULL); auth_error: bb_error_msg_and_die("no password entry for root"); } |