| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * vlock implementation for busybox
|
|---|
| 4 | *
|
|---|
| 5 | * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
|
|---|
| 6 | * Written by spoon <spon@ix.netcom.com>
|
|---|
| 7 | *
|
|---|
| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|---|
| 9 | */
|
|---|
| 10 |
|
|---|
| 11 | /* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
|
|---|
| 12 | * original vlock. I snagged a bunch of his code to write this
|
|---|
| 13 | * minimalistic vlock.
|
|---|
| 14 | */
|
|---|
| 15 | /* Fixed by Erik Andersen to do passwords the tinylogin way...
|
|---|
| 16 | * It now works with md5, sha1, etc passwords. */
|
|---|
| 17 |
|
|---|
| 18 | #include "libbb.h"
|
|---|
| 19 |
|
|---|
| 20 | #ifdef __linux__
|
|---|
| 21 | #include <sys/vt.h>
|
|---|
| 22 |
|
|---|
| 23 | static void release_vt(int signo UNUSED_PARAM)
|
|---|
| 24 | {
|
|---|
| 25 | /* If -a, param is 0, which means:
|
|---|
| 26 | * "no, kernel, we don't allow console switch away from us!" */
|
|---|
| 27 | ioctl(STDIN_FILENO, VT_RELDISP, (unsigned long) !option_mask32);
|
|---|
| 28 | }
|
|---|
| 29 |
|
|---|
| 30 | static void acquire_vt(int signo UNUSED_PARAM)
|
|---|
| 31 | {
|
|---|
| 32 | /* ACK to kernel that switch to console is successful */
|
|---|
| 33 | ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
|
|---|
| 34 | }
|
|---|
| 35 | #endif
|
|---|
| 36 |
|
|---|
| 37 | int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 38 | int vlock_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 39 | {
|
|---|
| 40 | #ifdef __linux__
|
|---|
| 41 | struct vt_mode vtm;
|
|---|
| 42 | struct vt_mode ovtm;
|
|---|
| 43 | #endif
|
|---|
| 44 | struct termios term;
|
|---|
| 45 | struct termios oterm;
|
|---|
| 46 | struct passwd *pw;
|
|---|
| 47 |
|
|---|
| 48 | pw = xgetpwuid(getuid());
|
|---|
| 49 | opt_complementary = "=0"; /* no params! */
|
|---|
| 50 | getopt32(argv, "a");
|
|---|
| 51 |
|
|---|
| 52 | /* Ignore some signals so that we don't get killed by them */
|
|---|
| 53 | bb_signals(0
|
|---|
| 54 | + (1 << SIGTSTP)
|
|---|
| 55 | + (1 << SIGTTIN)
|
|---|
| 56 | + (1 << SIGTTOU)
|
|---|
| 57 | + (1 << SIGHUP )
|
|---|
| 58 | + (1 << SIGCHLD) /* paranoia :) */
|
|---|
| 59 | + (1 << SIGQUIT)
|
|---|
| 60 | + (1 << SIGINT )
|
|---|
| 61 | , SIG_IGN);
|
|---|
| 62 |
|
|---|
| 63 | #ifdef __linux__
|
|---|
| 64 | /* We will use SIGUSRx for console switch control: */
|
|---|
| 65 | /* 1: set handlers */
|
|---|
| 66 | signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
|
|---|
| 67 | signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
|
|---|
| 68 | /* 2: unmask them */
|
|---|
| 69 | sig_unblock(SIGUSR1);
|
|---|
| 70 | sig_unblock(SIGUSR2);
|
|---|
| 71 | #endif
|
|---|
| 72 |
|
|---|
| 73 | /* Revert stdin/out to our controlling tty
|
|---|
| 74 | * (or die if we have none) */
|
|---|
| 75 | xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO);
|
|---|
| 76 | xdup2(STDIN_FILENO, STDOUT_FILENO);
|
|---|
| 77 |
|
|---|
| 78 | #ifdef __linux__
|
|---|
| 79 | xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
|
|---|
| 80 | ovtm = vtm;
|
|---|
| 81 | /* "console switches are controlled by us, not kernel!" */
|
|---|
| 82 | vtm.mode = VT_PROCESS;
|
|---|
| 83 | vtm.relsig = SIGUSR1;
|
|---|
| 84 | vtm.acqsig = SIGUSR2;
|
|---|
| 85 | ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
|
|---|
| 86 | #endif
|
|---|
| 87 |
|
|---|
| 88 | tcgetattr(STDIN_FILENO, &oterm);
|
|---|
| 89 | term = oterm;
|
|---|
| 90 | term.c_iflag &= ~BRKINT;
|
|---|
| 91 | term.c_iflag |= IGNBRK;
|
|---|
| 92 | term.c_lflag &= ~ISIG;
|
|---|
| 93 | term.c_lflag &= ~(ECHO | ECHOCTL);
|
|---|
| 94 | tcsetattr_stdin_TCSANOW(&term);
|
|---|
| 95 |
|
|---|
| 96 | do {
|
|---|
| 97 | printf("Virtual console%s locked by %s.\n",
|
|---|
| 98 | option_mask32 /*o_lock_all*/ ? "s" : "",
|
|---|
| 99 | pw->pw_name);
|
|---|
| 100 | if (correct_password(pw)) {
|
|---|
| 101 | break;
|
|---|
| 102 | }
|
|---|
| 103 | bb_do_delay(FAIL_DELAY);
|
|---|
| 104 | puts("Password incorrect");
|
|---|
| 105 | } while (1);
|
|---|
| 106 |
|
|---|
| 107 | #ifdef __linux__
|
|---|
| 108 | ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
|
|---|
| 109 | #endif
|
|---|
| 110 | tcsetattr_stdin_TCSANOW(&oterm);
|
|---|
| 111 | fflush_stdout_and_exit(EXIT_SUCCESS);
|
|---|
| 112 | }
|
|---|
