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120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* vlock implementation for busybox
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*
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* Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
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* Written by spoon <spon@ix.netcom.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
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* original vlock. I snagged a bunch of his code to write this
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* minimalistic vlock.
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*/
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/* Fixed by Erik Andersen to do passwords the tinylogin way...
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* It now works with md5, sha1, etc passwords. */
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#include "libbb.h"
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#include <sys/vt.h>
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static struct passwd *pw;
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static struct vt_mode ovtm;
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static struct termios oterm;
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static int vfd;
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static unsigned long o_lock_all;
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static void release_vt(int signo)
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{
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ioctl(vfd, VT_RELDISP, !o_lock_all);
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}
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static void acquire_vt(int signo)
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{
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ioctl(vfd, VT_RELDISP, VT_ACKACQ);
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}
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static void restore_terminal(void)
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{
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ioctl(vfd, VT_SETMODE, &ovtm);
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tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
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}
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int vlock_main(int argc, char **argv);
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int vlock_main(int argc, char **argv)
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{
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sigset_t sig;
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struct sigaction sa;
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struct vt_mode vtm;
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struct termios term;
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uid_t uid = getuid();
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pw = getpwuid(uid);
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if (pw == NULL)
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bb_error_msg_and_die("unknown uid %d", uid);
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if (argc > 2) {
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bb_show_usage();
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}
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o_lock_all = getopt32(argc, argv, "a");
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vfd = xopen(CURRENT_TTY, O_RDWR);
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if (ioctl(vfd, VT_GETMODE, &vtm) < 0) {
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bb_perror_msg_and_die("VT_GETMODE");
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}
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/* mask a bunch of signals */
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sigprocmask(SIG_SETMASK, NULL, &sig);
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sigdelset(&sig, SIGUSR1);
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sigdelset(&sig, SIGUSR2);
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sigaddset(&sig, SIGTSTP);
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sigaddset(&sig, SIGTTIN);
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sigaddset(&sig, SIGTTOU);
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sigaddset(&sig, SIGHUP);
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sigaddset(&sig, SIGCHLD);
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sigaddset(&sig, SIGQUIT);
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sigaddset(&sig, SIGINT);
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sigemptyset(&(sa.sa_mask));
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sa.sa_flags = SA_RESTART;
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sa.sa_handler = release_vt;
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_handler = acquire_vt;
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sigaction(SIGUSR2, &sa, NULL);
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/* need to handle some signals so that we don't get killed by them */
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sa.sa_handler = SIG_IGN;
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sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGQUIT, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGTSTP, &sa, NULL);
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ovtm = vtm;
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vtm.mode = VT_PROCESS;
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vtm.relsig = SIGUSR1;
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vtm.acqsig = SIGUSR2;
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ioctl(vfd, VT_SETMODE, &vtm);
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tcgetattr(STDIN_FILENO, &oterm);
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term = oterm;
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term.c_iflag &= ~BRKINT;
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term.c_iflag |= IGNBRK;
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term.c_lflag &= ~ISIG;
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term.c_lflag &= ~(ECHO | ECHOCTL);
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tcsetattr(STDIN_FILENO, TCSANOW, &term);
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do {
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printf("Virtual Console%s locked by %s.\n", (o_lock_all) ? "s" : "", pw->pw_name);
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if (correct_password(pw)) {
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break;
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}
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bb_do_delay(FAIL_DELAY);
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puts("Password incorrect");
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} while (1);
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restore_terminal();
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fflush_stdout_and_exit(0);
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}
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