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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