Mercurial > hg > toybox

annotate toys/login.c @ 642:812afb883392

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Minor cleanups, mostly whitespace.
author Rob Landley <rob@landley.net>
date Tue, 24 Jul 2012 02:52:36 -0500
parents 9aeea680acc7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * login.c - Start a session on the system.
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4 *
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5 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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6 *
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7 * Not in SUSv4.
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8 * No support for PAM/securetty/selinux/login script/issue/utmp
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9 * Relies on libcrypt for hash calculation.
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10
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11 USE_LOGIN(NEWTOY(login, ">1fph:", TOYFLAG_BIN))
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12
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13 config LOGIN
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14 bool "login"
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15 default y
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16 help
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17 usage: login [-p] [-h host] [[-f] username]
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18
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19 Establish a new session with the system.
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20 -p Preserve environment
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21 -h The name of the remote host for this login
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22 -f Do not perform authentication
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23 */
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24
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25 #include "toys.h"
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26
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27 #define LOGIN_TIMEOUT 60
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28 #define LOGIN_FAIL_TIMEOUT 3
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29 #define USER_NAME_MAX_SIZE 32
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30 #define HOSTNAME_SIZE 32
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31
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32 DEFINE_GLOBALS(
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33 char *hostname;
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34 )
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35 #define TT this.login
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36
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37 static void login_timeout_handler(int sig __attribute__((unused)))
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38 {
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39 printf("\nLogin timed out after %d seconds.\n", LOGIN_TIMEOUT);
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40 exit(0);
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41 }
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42
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43 static char *forbid[] = {
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44 "BASH_ENV",
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45 "ENV",
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46 "HOME",
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47 "IFS",
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48 "LD_LIBRARY_PATH",
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49 "LD_PRELOAD",
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50 "LD_TRACE_LOADED_OBJECTS",
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51 "LD_BIND_NOW",
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52 "LD_AOUT_LIBRARY_PATH",
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53 "LD_AOUT_PRELOAD",
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54 "LD_NOWARN",
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55 "LD_KEEPDIR",
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56 "SHELL",
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57 NULL
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58 };
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59
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60 int verify_password(char * pwd)
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61 {
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62 char *pass;
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63
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64 if (read_password(toybuf, sizeof(toybuf), "Password: ")) return 1;
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65 if (!pwd) return 1;
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66 if (pwd[0] == '!' || pwd[0] == '*') return 1;
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67
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68 pass = crypt(toybuf, pwd);
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69 if (pass && !strcmp(pass, pwd)) return 0;
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70
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71 return 1;
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72 }
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73
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74 void read_user(char * buff, int size)
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75 {
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76 char hostname[HOSTNAME_SIZE+1];
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77 int i = 0;
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78 hostname[HOSTNAME_SIZE] = 0;
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79 if(!gethostname(hostname, HOSTNAME_SIZE)) fputs(hostname, stdout);
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80
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81 fputs(" login: ", stdout);
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82 fflush(stdout);
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83
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84 do {
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85 buff[0] = getchar();
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86 if (buff[0] == EOF)
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87 exit(EXIT_FAILURE);
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88 } while (isblank(buff[0]));
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89
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90 if (buff[0] != '\n')
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91 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin))
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92 _exit(1);
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93
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94 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) i++;
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95 buff[i] = 0;
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96 }
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97
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98 void handle_nologin(void)
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99 {
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100 int fd = open("/etc/nologin", 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 if (!size) puts("System closed for routine maintenance\n");
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107 else puts(toybuf);
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108
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109 close(fd);
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110 fflush(stdout);
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111 exit(EXIT_FAILURE);
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112 }
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113
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114 void handle_motd(void)
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115 {
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116 int fd = open("/etc/motd", O_RDONLY);
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117 int size;
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118 if (fd == -1) return;
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119
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120 size = readall(fd, toybuf,sizeof(toybuf)-1);
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121 toybuf[size] = 0;
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122 puts(toybuf);
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123
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124 close(fd);
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125 fflush(stdout);
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126 }
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127
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128 int change_identity(const struct passwd *pwd)
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129 {
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130 if (initgroups(pwd->pw_name,pwd->pw_gid)) return 1;
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131 if (setgid(pwd->pw_uid)) return 1;
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132 if (setuid(pwd->pw_uid)) return 1;
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133
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134 return 0;
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135 }
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136
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137 void spawn_shell(const char *shell)
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138 {
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139 const char * exec_name = strrchr(shell,'/');
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140 if (exec_name) exec_name++;
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141 else exec_name = shell;
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142
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143 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell);
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144 execl(shell, toybuf, NULL);
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145 error_exit("Failed to spawn shell");
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146 }
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147
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148 void setup_environment(const struct passwd *pwd, int clear_env)
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149 {
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150 if (chdir(pwd->pw_dir)) printf("bad home dir: %s\n", pwd->pw_dir);
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151
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152 if (clear_env) {
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153 const char * term = getenv("TERM");
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154 clearenv();
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155 if (term) setenv("TERM", term, 1);
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156 }
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157
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158 setenv("USER", pwd->pw_name, 1);
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159 setenv("LOGNAME", pwd->pw_name, 1);
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160 setenv("HOME", pwd->pw_dir, 1);
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161 setenv("SHELL", pwd->pw_shell, 1);
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162 }
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163
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164 void login_main(void)
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165 {
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166 int f_flag = (toys.optflags & 4) >> 2;
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167 int p_flag = (toys.optflags & 2) >> 1;
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168 int h_flag = toys.optflags & 1;
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169 char username[USER_NAME_MAX_SIZE+1], *pass = NULL, **ss;
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170 struct passwd * pwd = NULL;
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171 struct spwd * spwd = NULL;
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172 int auth_fail_cnt = 0;
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173
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174 if (f_flag && toys.optc != 1)
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175 error_exit("-f requires username");
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176
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177 if (geteuid()) error_exit("not root");
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178
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179 if (!isatty(0) || !isatty(1) || !isatty(2)) error_exit("no tty");
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180
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181 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH);
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182 signal(SIGALRM, login_timeout_handler);
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183 alarm(LOGIN_TIMEOUT);
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184
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185 for (ss = forbid; *ss; ss++) unsetenv(*ss);
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186
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187 while (1) {
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188 tcflush(0, TCIFLUSH);
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189
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190 username[USER_NAME_MAX_SIZE] = 0;
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191 if (toys.optargs[0])
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192 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE);
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193 else {
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194 read_user(username, USER_NAME_MAX_SIZE+1);
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195 if (username[0] == 0) continue;
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196 }
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197
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198 pwd = getpwnam(username);
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199 if (!pwd) goto query_pass; // Non-existing user
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200
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201 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*')
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202 goto query_pass; // Locked account
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203
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204 if (f_flag) break; // Pre-authenticated
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205
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206 if (!pwd->pw_passwd[0]) break; // Password-less account
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207
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208 pass = pwd->pw_passwd;
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209 if (pwd->pw_passwd[0] == 'x') {
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210 spwd = getspnam (username);
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211 if (spwd) pass = spwd->sp_pwdp;
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212 }
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213
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214 query_pass:
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215 if (!verify_password(pass)) break;
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216
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217 f_flag = 0;
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218 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username,
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219 ttyname(0), (h_flag)?"from":"", (h_flag)?TT.hostname:"");
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220
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221 sleep(LOGIN_FAIL_TIMEOUT);
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222 puts("Login incorrect");
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diff changeset
223
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224 if (++auth_fail_cnt == 3)
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225 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt);
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226
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227 username[0] = 0;
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228 pwd = NULL;
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229 spwd = NULL;
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230 }
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parents:
diff changeset
231
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232 alarm(0);
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233
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diff changeset
234 if (pwd->pw_uid) handle_nologin();
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235
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diff changeset
236 if (change_identity(pwd)) error_exit("Failed to change identity");
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237
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238 setup_environment(pwd, !p_flag);
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parents:
diff changeset
239
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diff changeset
240 handle_motd();
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diff changeset
241
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diff changeset
242 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name,
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diff changeset
243 ttyname(0), (h_flag)?"from":"", (h_flag)?TT.hostname:"");
572
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diff changeset
244
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245 spawn_shell(pwd->pw_shell);
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246 }