annotate toys/other/login.c @ 1736:5892daac85ab draft

Switch nsenter to default y.
author Rob Landley <rob@landley.net>
date Thu, 12 Mar 2015 15:34:03 -0500
parents c0ef9b7976f0
children
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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 depends on TOYBOX_SHADOW
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14 help
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15 usage: login [-p] [-h host] [[-f] username]
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17 Establish a new session with the system.
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18
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19 -p Preserve environment
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20 -h The name of the remote host for this login
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21 -f Do not perform authentication
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22 */
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23
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24 #define FOR_login
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25 #include "toys.h"
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26
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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 int login_timeout, login_fail_timeout;
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34 )
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35
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36 static void login_timeout_handler(int sig __attribute__((unused)))
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37 {
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38 printf("\nLogin timed out after %d seconds.\n", TT.login_timeout);
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39 exit(0);
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40 }
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41
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42 static char *forbid[] = {
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43 "BASH_ENV", "ENV", "HOME", "IFS", "LD_LIBRARY_PATH", "LD_PRELOAD",
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44 "LD_TRACE_LOADED_OBJECTS", "LD_BIND_NOW", "LD_AOUT_LIBRARY_PATH",
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45 "LD_AOUT_PRELOAD", "LD_NOWARN", "LD_KEEPDIR", "SHELL", NULL
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46 };
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47
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48 int verify_password(char * pwd)
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49 {
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50 char *pass;
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51
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52 if (read_password(toybuf, sizeof(toybuf), "Password: ")) return 1;
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53 if (!pwd) return 1;
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54 if (pwd[0] == '!' || pwd[0] == '*') return 1;
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56 pass = crypt(toybuf, pwd);
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57 if (pass && !strcmp(pass, pwd)) return 0;
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58
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59 return 1;
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60 }
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61
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62 void read_user(char * buff, int size)
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63 {
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64 char hostname[HOSTNAME_SIZE+1];
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65 int i = 0;
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66
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67 hostname[HOSTNAME_SIZE] = 0;
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68 if (!gethostname(hostname, HOSTNAME_SIZE)) fputs(hostname, stdout);
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69
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70 fputs(" login: ", stdout);
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71 fflush(stdout);
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73 do {
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74 int c = getchar();
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75 if (c == EOF) exit(EXIT_FAILURE);
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76 *buff = c;
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77 } while (isblank(*buff));
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78
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79 if (*buff != '\n') if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) _exit(1);
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81 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) i++;
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82 buff[i] = 0;
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83 }
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84
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85 void handle_nologin(void)
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86 {
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87 int fd = open("/etc/nologin", O_RDONLY);
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88 int size;
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89
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90 if (fd == -1) return;
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91
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92 size = readall(fd, toybuf,sizeof(toybuf)-1);
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93 toybuf[size] = 0;
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94 if (!size) puts("System closed for routine maintenance\n");
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95 else puts(toybuf);
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97 close(fd);
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98 fflush(stdout);
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99 exit(1);
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100 }
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101
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102 void handle_motd(void)
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103 {
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104 int fd = open("/etc/motd", O_RDONLY);
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105 int size;
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106 if (fd == -1) return;
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107
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108 size = readall(fd, toybuf,sizeof(toybuf)-1);
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109 toybuf[size] = 0;
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110 puts(toybuf);
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111
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112 close(fd);
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113 fflush(stdout);
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114 }
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115
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116 void spawn_shell(const char *shell)
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117 {
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118 const char * exec_name = strrchr(shell,'/');
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119 if (exec_name) exec_name++;
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120 else exec_name = shell;
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121
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122 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell);
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123 execl(shell, toybuf, NULL);
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124 error_exit("Failed to spawn shell");
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125 }
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126
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127 void setup_environment(const struct passwd *pwd, int clear_env)
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128 {
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129 if (chdir(pwd->pw_dir)) printf("bad home dir: %s\n", pwd->pw_dir);
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130
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131 if (clear_env) {
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132 const char *term = getenv("TERM");
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133 clearenv();
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134 if (term) setenv("TERM", term, 1);
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135 }
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136
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137 setenv("USER", pwd->pw_name, 1);
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138 setenv("LOGNAME", pwd->pw_name, 1);
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139 setenv("HOME", pwd->pw_dir, 1);
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140 setenv("SHELL", pwd->pw_shell, 1);
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141 }
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142
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143 void login_main(void)
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144 {
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145 int f_flag = toys.optflags & FLAG_f;
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146 int h_flag = toys.optflags & FLAG_h;
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147 char username[33], *pass = NULL, **ss;
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148 struct passwd * pwd = NULL;
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149 struct spwd * spwd = NULL;
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150 int auth_fail_cnt = 0;
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151
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152 if (f_flag && toys.optc != 1) error_exit("-f requires username");
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153
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154 if (geteuid()) error_exit("not root");
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155
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156 if (!isatty(0) || !isatty(1) || !isatty(2)) error_exit("no tty");
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157
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158 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH);
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159 xsignal(SIGALRM, login_timeout_handler);
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160 alarm(TT.login_timeout = 60);
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161
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162 for (ss = forbid; *ss; ss++) unsetenv(*ss);
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163
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164 while (1) {
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165 tcflush(0, TCIFLUSH);
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166
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167 username[sizeof(username)-1] = 0;
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168 if (*toys.optargs) xstrncpy(username, *toys.optargs, sizeof(username));
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169 else {
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170 read_user(username, sizeof(username));
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171 if (!*username) continue;
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172 }
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173
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174 pwd = getpwnam(username);
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175 if (!pwd) goto query_pass; // Non-existing user
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176
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177 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*')
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178 goto query_pass; // Locked account
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179
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180 if (f_flag) break; // Pre-authenticated
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181
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182 if (!pwd->pw_passwd[0]) break; // Password-less account
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183
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184 pass = pwd->pw_passwd;
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185 if (pwd->pw_passwd[0] == 'x') {
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186 spwd = getspnam (username);
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187 if (spwd) pass = spwd->sp_pwdp;
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188 }
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189
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190 query_pass:
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191 if (!verify_password(pass)) break;
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192
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193 f_flag = 0;
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194 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username,
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195 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:"");
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196
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197 sleep(3);
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198 puts("Login incorrect");
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199
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200 if (++auth_fail_cnt == 3)
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201 error_exit("Maximum number of tries exceeded (3)\n");
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202
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203 *username = 0;
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204 pwd = 0;
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205 spwd = 0;
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206 }
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207
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208 alarm(0);
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209
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210 if (pwd->pw_uid) handle_nologin();
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211
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212 xsetuser(pwd);
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214 setup_environment(pwd, !(toys.optflags & FLAG_p));
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216 handle_motd();
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218 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name,
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219 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:"");
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220
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221 spawn_shell(pwd->pw_shell);
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222 }