Mercurial > hg > toybox

annotate toys/pending/sulogin.c @ 1396:e0c9c5424864 draft

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Isaac Dunham spotted that dhcp was also reimplementing daemon().
author Rob Landley <rob@landley.net>
date Sun, 20 Jul 2014 21:34:49 -0500
parents 5d64dc59e569
children 685a0da6ca59
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1 /* sulogin.c - Single User Login.
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2 *
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3 * Copyright 2014 Ashish Kumar Gupta <ashishkguptaiit.cse@gmail.com>
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4 * Copyright 2014 Kyungwan Han <asura321@gmail.com>
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5 *
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6 *
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7 * Relies on libcrypt for hash calculation.
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8 * No support for PAM/securetty/selinux/login script/issue/utmp
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9
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10
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11 USE_SULOGIN(NEWTOY(sulogin, "t#<0=0", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
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12
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13 config SULOGIN
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14 bool "sulogin"
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15 default n
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16 help
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17 usage: sulogin [-t time] [tty]
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18
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19 Single User Login.
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20 -t Default Time for Single User Login
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21 */
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22 #define FOR_sulogin
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23 #include "toys.h"
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24
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25 GLOBALS(
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26 long timeout;
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27 struct termios crntio;
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28 )
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29
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30 static void timeout_handle(int signo)
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31 {
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32 tcsetattr(0, TCSANOW, &(TT.crntio));
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33 fflush(stdout);
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34 xprintf("\n Timed out - Normal startup\n");
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35 exit(0);
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36 }
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37
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38 static int validate_password(char *pwd)
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39 {
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40 struct sigaction sa;
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41 int ret;
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42 char *s = "Give root password for system maintenance\n"
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43 "(or type Control-D for normal startup):",
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44 *pass;
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45
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46 tcgetattr(0, &(TT.crntio));
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47 sa.sa_handler = timeout_handle;
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48
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49 if(TT.timeout) {
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50 sigaction(SIGALRM, &sa, NULL);
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51 alarm(TT.timeout);
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52 }
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53
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54 ret = read_password(toybuf, sizeof(toybuf), s);
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55 if(TT.timeout) alarm(0);
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56
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57 if ( ret && !toybuf[0]) {
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58 xprintf("Normal startup.\n");
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59 return -1;
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60 }
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61
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62 pass = crypt(toybuf, pwd);
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63 ret = 1;
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64 if( pass && !strcmp(pass, pwd)) ret = 0;
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65
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66 return ret;
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67 }
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68
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69 static void run_shell(char *shell)
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70 {
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71 snprintf(toybuf,sizeof(toybuf), "-%s", shell);
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72 execl(shell, toybuf, NULL);
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73 error_exit("Failed to spawn shell");
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74 }
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75
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76 void sulogin_main(void)
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77 {
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78 struct passwd *pwd = NULL;
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79 struct spwd * spwd = NULL;
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80 char *forbid[] = {
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81 "BASH_ENV", "ENV", "HOME", "IFS", "LD_LIBRARY_PATH", "LD_PRELOAD",
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82 "LD_TRACE_LOADED_OBJECTS", "LD_BIND_NOW", "LD_AOUT_LIBRARY_PATH",
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83 "LD_AOUT_PRELOAD", "LD_NOWARN", "LD_KEEPDIR", "SHELL", NULL
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84 };
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85 char *shell = NULL, *pass = NULL, **temp = forbid;
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86
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87 if (toys.optargs[0]) {
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88 int fd;
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89
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90 dup2((fd = xopen(toys.optargs[0], O_RDWR)), 0);
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91 if (!isatty(0)) error_exit("%s: it is not a tty", toys.optargs[0]);
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92 dup2( fd, 1);
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93 dup2( fd, 2);
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94 if (fd > 2) close(fd);
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95 }
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96
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97 for (temp = forbid; *temp; temp++) unsetenv(*temp);
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98
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99 if (!(pwd = getpwuid(0))) error_exit("invalid user");
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100 pass = pwd->pw_passwd;
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101
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102 if ((pass[0] == 'x' || pass[0] == '*') && !pass[1]) {
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103 if ((spwd = getspnam (pwd->pw_name))) pass = spwd->sp_pwdp;
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104 }
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105
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106 while (1) {
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107 int r = validate_password(pass);
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108
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109 if (r == 1) xprintf("Incorrect Login.\n");
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110 else if (r == 0) break;
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111 else if (r == -1) return;
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112 }
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113
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114 if ((shell = getenv("SUSHELL")) || (shell = getenv("sushell"))
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115 || (shell = pwd->pw_shell))
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116 run_shell((shell && *shell)? shell: "/bin/sh");
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117 }