Mercurial > hg > toybox
annotate toys/other/login.c @ 718:0ed3351d91eb
login: Avoid gcc to drop exit condition because of "always false condition".
author | Jonathan Clairembault <jonathan@clairembault.fr> |
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date | Tue, 27 Nov 2012 11:09:04 +0100 |
parents | 786841fdb1e0 |
children | faf7117c4489 |
rev | line source |
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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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53 |
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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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56 |
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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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77 |
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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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186 |
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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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201 |
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202 sleep(LOGIN_FAIL_TIMEOUT); |
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203 puts("Login incorrect"); |
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204 |
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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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207 |
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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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212 |
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213 alarm(0); |
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214 |
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215 if (pwd->pw_uid) handle_nologin(); |
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216 |
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217 if (change_identity(pwd)) error_exit("Failed to change identity"); |
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218 |
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219 setup_environment(pwd, !(toys.optflags & FLAG_p)); |
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220 |
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221 handle_motd(); |
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222 |
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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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225 |
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226 spawn_shell(pwd->pw_shell); |
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227 } |