| 1 | /* vi: set sw=4 ts=4: */
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| 2 |
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| 3 | /*
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| 4 | * vlock implementation for busybox
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| 5 | *
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| 6 | * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
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| 7 | * Written by spoon <spon@ix.netcom.com>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | */
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| 11 |
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| 12 | /* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
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| 13 | * original vlock. I snagged a bunch of his code to write this
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| 14 | * minimalistic vlock.
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| 15 | */
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| 16 | /* Fixed by Erik Andersen to do passwords the tinylogin way...
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| 17 | * It now works with md5, sha1, etc passwords. */
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| 18 |
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| 19 | #include "libbb.h"
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| 20 | #include <sys/vt.h>
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| 21 |
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| 22 | static struct passwd *pw;
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| 23 | static struct vt_mode ovtm;
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| 24 | static struct termios oterm;
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| 25 | static int vfd;
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| 26 | static unsigned long o_lock_all;
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| 27 |
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| 28 | static void release_vt(int signo)
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| 29 | {
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| 30 | ioctl(vfd, VT_RELDISP, !o_lock_all);
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| 31 | }
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| 32 |
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| 33 | static void acquire_vt(int signo)
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| 34 | {
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| 35 | ioctl(vfd, VT_RELDISP, VT_ACKACQ);
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| 36 | }
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| 37 |
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| 38 | static void restore_terminal(void)
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| 39 | {
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| 40 | ioctl(vfd, VT_SETMODE, &ovtm);
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| 41 | tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
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| 42 | }
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| 43 |
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| 44 | int vlock_main(int argc, char **argv);
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| 45 | int vlock_main(int argc, char **argv)
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| 46 | {
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| 47 | sigset_t sig;
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| 48 | struct sigaction sa;
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| 49 | struct vt_mode vtm;
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| 50 | struct termios term;
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| 51 | uid_t uid = getuid();
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| 52 |
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| 53 | pw = getpwuid(uid);
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| 54 | if (pw == NULL)
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| 55 | bb_error_msg_and_die("unknown uid %d", uid);
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| 56 |
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| 57 | if (argc > 2) {
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| 58 | bb_show_usage();
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| 59 | }
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| 60 |
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| 61 | o_lock_all = getopt32(argv, "a");
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| 62 |
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| 63 | vfd = xopen(CURRENT_TTY, O_RDWR);
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| 64 |
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| 65 | xioctl(vfd, VT_GETMODE, &vtm);
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| 66 |
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| 67 | /* mask a bunch of signals */
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| 68 | sigprocmask(SIG_SETMASK, NULL, &sig);
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| 69 | sigdelset(&sig, SIGUSR1);
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| 70 | sigdelset(&sig, SIGUSR2);
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| 71 | sigaddset(&sig, SIGTSTP);
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| 72 | sigaddset(&sig, SIGTTIN);
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| 73 | sigaddset(&sig, SIGTTOU);
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| 74 | sigaddset(&sig, SIGHUP);
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| 75 | sigaddset(&sig, SIGCHLD);
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| 76 | sigaddset(&sig, SIGQUIT);
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| 77 | sigaddset(&sig, SIGINT);
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| 78 |
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| 79 | sigemptyset(&(sa.sa_mask));
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| 80 | sa.sa_flags = SA_RESTART;
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| 81 | sa.sa_handler = release_vt;
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| 82 | sigaction(SIGUSR1, &sa, NULL);
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| 83 | sa.sa_handler = acquire_vt;
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| 84 | sigaction(SIGUSR2, &sa, NULL);
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| 85 |
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| 86 | /* need to handle some signals so that we don't get killed by them */
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| 87 | sa.sa_handler = SIG_IGN;
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| 88 | sigaction(SIGHUP, &sa, NULL);
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| 89 | sigaction(SIGQUIT, &sa, NULL);
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| 90 | sigaction(SIGINT, &sa, NULL);
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| 91 | sigaction(SIGTSTP, &sa, NULL);
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| 92 |
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| 93 | ovtm = vtm;
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| 94 | vtm.mode = VT_PROCESS;
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| 95 | vtm.relsig = SIGUSR1;
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| 96 | vtm.acqsig = SIGUSR2;
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| 97 | ioctl(vfd, VT_SETMODE, &vtm);
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| 98 |
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| 99 | tcgetattr(STDIN_FILENO, &oterm);
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| 100 | term = oterm;
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| 101 | term.c_iflag &= ~BRKINT;
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| 102 | term.c_iflag |= IGNBRK;
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| 103 | term.c_lflag &= ~ISIG;
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| 104 | term.c_lflag &= ~(ECHO | ECHOCTL);
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| 105 | tcsetattr(STDIN_FILENO, TCSANOW, &term);
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| 106 |
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| 107 | do {
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| 108 | printf("Virtual Console%s locked by %s.\n", (o_lock_all) ? "s" : "", pw->pw_name);
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| 109 | if (correct_password(pw)) {
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| 110 | break;
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| 111 | }
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| 112 | bb_do_delay(FAIL_DELAY);
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| 113 | puts("Password incorrect");
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| 114 | } while (1);
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| 115 | restore_terminal();
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| 116 | fflush_stdout_and_exit(0);
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| 117 | }
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