Mercurial > hg > toybox

annotate toys/other/login.c @ 877:37e668afd008

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Isaac Dunham pointed out that the kernel treats - and _ as identical in module names, so modinfo should too. Made it use mmap() while I was there, and some cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Wed, 24 Apr 2013 03:04:31 -0500
parents 0ed3351d91eb
children faf7117c4489
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1 /* login.c - Start a session on the system.
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2 *
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3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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4 *
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5 * No support for PAM/securetty/selinux/login script/issue/utmp
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6 * Relies on libcrypt for hash calculation.
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7
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8 USE_LOGIN(NEWTOY(login, ">1fph:", TOYFLAG_BIN))
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9
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10 config LOGIN
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11 bool "login"
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12 default y
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13 help
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14 usage: login [-p] [-h host] [[-f] username]
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15
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16 Establish a new session with the system.
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17 -p Preserve environment
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18 -h The name of the remote host for this login
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19 -f Do not perform authentication
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20 */
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21
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22 #define FOR_login
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23 #include "toys.h"
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24
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25 #define LOGIN_TIMEOUT 60
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26 #define LOGIN_FAIL_TIMEOUT 3
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27 #define USER_NAME_MAX_SIZE 32
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28 #define HOSTNAME_SIZE 32
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29
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30 GLOBALS(
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31 char *hostname;
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32 )
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33
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34 static void login_timeout_handler(int sig __attribute__((unused)))
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35 {
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36 printf("\nLogin timed out after %d seconds.\n", LOGIN_TIMEOUT);
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37 exit(0);
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38 }
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39
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40 static char *forbid[] = {
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41 "BASH_ENV", "ENV", "HOME", "IFS", "LD_LIBRARY_PATH", "LD_PRELOAD",
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42 "LD_TRACE_LOADED_OBJECTS", "LD_BIND_NOW", "LD_AOUT_LIBRARY_PATH",
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43 "LD_AOUT_PRELOAD", "LD_NOWARN", "LD_KEEPDIR", "SHELL", NULL
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44 };
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45
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46 int verify_password(char * pwd)
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47 {
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48 char *pass;
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49
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50 if (read_password(toybuf, sizeof(toybuf), "Password: ")) return 1;
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51 if (!pwd) return 1;
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52 if (pwd[0] == '!' || pwd[0] == '*') return 1;
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54 pass = crypt(toybuf, pwd);
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55 if (pass && !strcmp(pass, pwd)) return 0;
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57 return 1;
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58 }
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59
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60 void read_user(char * buff, int size)
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61 {
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62 char hostname[HOSTNAME_SIZE+1];
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63 int i = 0;
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64 hostname[HOSTNAME_SIZE] = 0;
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65 if(!gethostname(hostname, HOSTNAME_SIZE)) fputs(hostname, stdout);
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66
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67 fputs(" login: ", stdout);
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68 fflush(stdout);
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69
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70 do {
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71 int c = getchar();
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72 if (c == EOF) exit(EXIT_FAILURE);
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73 buff[0] = c;
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74 } while (isblank(buff[0]));
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75
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76 if (buff[0] != '\n') if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) _exit(1);
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78 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) i++;
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79 buff[i] = 0;
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80 }
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81
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82 void handle_nologin(void)
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83 {
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84 int fd = open("/etc/nologin", O_RDONLY);
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85 int size;
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86 if (fd == -1) return;
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87
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88 size = readall(fd, toybuf,sizeof(toybuf)-1);
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89 toybuf[size] = 0;
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90 if (!size) puts("System closed for routine maintenance\n");
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91 else puts(toybuf);
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92
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93 close(fd);
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94 fflush(stdout);
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95 exit(EXIT_FAILURE);
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96 }
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97
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98 void handle_motd(void)
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99 {
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100 int fd = open("/etc/motd", O_RDONLY);
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101 int size;
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102 if (fd == -1) return;
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103
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104 size = readall(fd, toybuf,sizeof(toybuf)-1);
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105 toybuf[size] = 0;
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106 puts(toybuf);
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107
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108 close(fd);
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109 fflush(stdout);
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110 }
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111
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112 int change_identity(const struct passwd *pwd)
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113 {
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114 if (initgroups(pwd->pw_name,pwd->pw_gid)) return 1;
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115 if (setgid(pwd->pw_uid)) return 1;
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116 if (setuid(pwd->pw_uid)) return 1;
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117
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118 return 0;
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119 }
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120
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121 void spawn_shell(const char *shell)
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122 {
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123 const char * exec_name = strrchr(shell,'/');
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124 if (exec_name) exec_name++;
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125 else exec_name = shell;
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126
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127 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell);
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128 execl(shell, toybuf, NULL);
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129 error_exit("Failed to spawn shell");
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130 }
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131
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132 void setup_environment(const struct passwd *pwd, int clear_env)
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133 {
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134 if (chdir(pwd->pw_dir)) printf("bad home dir: %s\n", pwd->pw_dir);
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135
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136 if (clear_env) {
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137 const char * term = getenv("TERM");
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138 clearenv();
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139 if (term) setenv("TERM", term, 1);
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140 }
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141
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142 setenv("USER", pwd->pw_name, 1);
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143 setenv("LOGNAME", pwd->pw_name, 1);
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144 setenv("HOME", pwd->pw_dir, 1);
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145 setenv("SHELL", pwd->pw_shell, 1);
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146 }
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147
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148 void login_main(void)
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149 {
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150 int f_flag = toys.optflags & FLAG_f;
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151 int h_flag = toys.optflags & FLAG_h;
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152 char username[USER_NAME_MAX_SIZE+1], *pass = NULL, **ss;
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153 struct passwd * pwd = NULL;
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154 struct spwd * spwd = NULL;
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155 int auth_fail_cnt = 0;
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156
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157 if (f_flag && toys.optc != 1) error_exit("-f requires username");
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158
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159 if (geteuid()) error_exit("not root");
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160
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161 if (!isatty(0) || !isatty(1) || !isatty(2)) error_exit("no tty");
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162
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163 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH);
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164 signal(SIGALRM, login_timeout_handler);
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165 alarm(LOGIN_TIMEOUT);
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166
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167 for (ss = forbid; *ss; ss++) unsetenv(*ss);
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168
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169 while (1) {
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170 tcflush(0, TCIFLUSH);
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171
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172 username[USER_NAME_MAX_SIZE] = 0;
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173 if (toys.optargs[0]) strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE);
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174 else {
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175 read_user(username, USER_NAME_MAX_SIZE+1);
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176 if (username[0] == 0) continue;
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177 }
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178
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179 pwd = getpwnam(username);
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180 if (!pwd) goto query_pass; // Non-existing user
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181
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182 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*')
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183 goto query_pass; // Locked account
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184
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185 if (f_flag) break; // Pre-authenticated
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187 if (!pwd->pw_passwd[0]) break; // Password-less account
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188
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189 pass = pwd->pw_passwd;
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190 if (pwd->pw_passwd[0] == 'x') {
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191 spwd = getspnam (username);
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192 if (spwd) pass = spwd->sp_pwdp;
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193 }
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194
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195 query_pass:
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196 if (!verify_password(pass)) break;
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197
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198 f_flag = 0;
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199 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username,
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200 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:"");
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202 sleep(LOGIN_FAIL_TIMEOUT);
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203 puts("Login incorrect");
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205 if (++auth_fail_cnt == 3)
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206 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt);
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208 username[0] = 0;
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209 pwd = NULL;
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210 spwd = NULL;
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211 }
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213 alarm(0);
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215 if (pwd->pw_uid) handle_nologin();
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217 if (change_identity(pwd)) error_exit("Failed to change identity");
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219 setup_environment(pwd, !(toys.optflags & FLAG_p));
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221 handle_motd();
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223 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name,
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224 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:"");
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226 spawn_shell(pwd->pw_shell);
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227 }