1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * vlock implementation for busybox
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4 | *
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5 | * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
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6 | * Written by spoon <spon@ix.netcom.com>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | /* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
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12 | * original vlock. I snagged a bunch of his code to write this
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13 | * minimalistic vlock.
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14 | */
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15 | /* Fixed by Erik Andersen to do passwords the tinylogin way...
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16 | * It now works with md5, sha1, etc passwords. */
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17 |
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18 | #include <stdio.h>
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19 | #include <stdlib.h>
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20 | #include <sys/vt.h>
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21 | #include <signal.h>
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22 | #include <string.h>
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23 | #include <unistd.h>
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24 | #include <fcntl.h>
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25 | #include <errno.h>
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26 | #include <sys/ioctl.h>
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27 | #include <termios.h>
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28 |
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29 | #include "busybox.h"
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30 |
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31 | static struct passwd *pw;
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32 | static struct vt_mode ovtm;
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33 | static struct termios oterm;
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34 | static int vfd;
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35 | static unsigned long o_lock_all;
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36 |
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37 | static void release_vt(int signo)
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38 | {
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39 | if (!o_lock_all)
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40 | ioctl(vfd, VT_RELDISP, 1);
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41 | else
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42 | ioctl(vfd, VT_RELDISP, 0);
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43 | }
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44 |
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45 | static void acquire_vt(int signo)
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46 | {
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47 | ioctl(vfd, VT_RELDISP, VT_ACKACQ);
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48 | }
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49 |
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50 | static void restore_terminal(void)
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51 | {
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52 | ioctl(vfd, VT_SETMODE, &ovtm);
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53 | tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
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54 | }
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55 |
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56 | int vlock_main(int argc, char **argv)
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57 | {
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58 | sigset_t sig;
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59 | struct sigaction sa;
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60 | struct vt_mode vtm;
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61 | struct termios term;
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62 |
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63 | if (argc > 2) {
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64 | bb_show_usage();
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65 | }
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66 |
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67 | o_lock_all = bb_getopt_ulflags (argc, argv, "a");
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68 |
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69 | if((pw = getpwuid(getuid())) == NULL) {
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70 | bb_error_msg_and_die("Unknown uid %d", getuid());
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71 | }
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72 |
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73 | vfd = bb_xopen(CURRENT_TTY, O_RDWR);
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74 |
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75 | if (ioctl(vfd, VT_GETMODE, &vtm) < 0) {
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76 | bb_perror_msg_and_die("VT_GETMODE");
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77 | }
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78 |
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79 | /* mask a bunch of signals */
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80 | sigprocmask(SIG_SETMASK, NULL, &sig);
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81 | sigdelset(&sig, SIGUSR1);
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82 | sigdelset(&sig, SIGUSR2);
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83 | sigaddset(&sig, SIGTSTP);
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84 | sigaddset(&sig, SIGTTIN);
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85 | sigaddset(&sig, SIGTTOU);
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86 | sigaddset(&sig, SIGHUP);
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87 | sigaddset(&sig, SIGCHLD);
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88 | sigaddset(&sig, SIGQUIT);
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89 | sigaddset(&sig, SIGINT);
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90 |
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91 | sigemptyset(&(sa.sa_mask));
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92 | sa.sa_flags = SA_RESTART;
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93 | sa.sa_handler = release_vt;
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94 | sigaction(SIGUSR1, &sa, NULL);
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95 | sa.sa_handler = acquire_vt;
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96 | sigaction(SIGUSR2, &sa, NULL);
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97 |
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98 | /* need to handle some signals so that we don't get killed by them */
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99 | sa.sa_handler = SIG_IGN;
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100 | sigaction(SIGHUP, &sa, NULL);
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101 | sigaction(SIGQUIT, &sa, NULL);
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102 | sigaction(SIGINT, &sa, NULL);
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103 | sigaction(SIGTSTP, &sa, NULL);
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104 |
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105 | ovtm = vtm;
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106 | vtm.mode = VT_PROCESS;
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107 | vtm.relsig = SIGUSR1;
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108 | vtm.acqsig = SIGUSR2;
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109 | ioctl(vfd, VT_SETMODE, &vtm);
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110 |
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111 | tcgetattr(STDIN_FILENO, &oterm);
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112 | term = oterm;
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113 | term.c_iflag &= ~BRKINT;
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114 | term.c_iflag |= IGNBRK;
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115 | term.c_lflag &= ~ISIG;
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116 | term.c_lflag &= ~(ECHO | ECHOCTL);
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117 | tcsetattr(STDIN_FILENO, TCSANOW, &term);
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118 |
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119 | do {
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120 | printf("Virtual Console%s locked.\n%s's ", (o_lock_all) ? "s" : "", pw->pw_name);
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121 | fflush(stdout);
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122 | if (correct_password (pw)) {
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123 | break;
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124 | }
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125 | bb_do_delay(FAIL_DELAY);
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126 | puts("Password incorrect.");
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127 | } while (1);
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128 | restore_terminal();
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129 | return 0;
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130 | }
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