Mercurial > hg > toybox
annotate toys/login.c @ 633:98bde84a888c
toys/login.c: make use of the read_passwd function offered by the passwd library.
author | Elie De Brauwer <eliedebrauwer@gmail.com> |
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date | Fri, 20 Jul 2012 08:42:44 +0200 |
parents | 8a88a9e3c30b |
children | 9aeea680acc7 |
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 const 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 // Unset dangerous environment variables. |
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61 void sanitize_env() |
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62 { |
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63 const char **p = forbid; |
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64 do { |
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65 unsetenv(*p); |
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66 p++; |
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67 } while (*p); |
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68 } |
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69 |
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70 int verify_password(char * pwd) |
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71 { |
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72 char * pass; |
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73 |
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toys/login.c: make use of the read_passwd function offered by the passwd library.
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74 if (read_passwd(toybuf, sizeof(toybuf), "Password: ")) |
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75 return 1; |
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76 if (!pwd) |
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77 return 1; |
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78 if (pwd[0] == '!' || pwd[0] == '*') |
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79 return 1; |
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80 |
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81 pass = crypt(toybuf, pwd); |
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82 if (pass != NULL && strcmp(pass, pwd)==0) |
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83 return 0; |
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84 |
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85 return 1; |
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86 } |
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87 |
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88 void read_user(char * buff, int size) |
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89 { |
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90 char hostname[HOSTNAME_SIZE+1]; |
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91 int i = 0; |
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92 hostname[HOSTNAME_SIZE] = 0; |
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93 if(!gethostname(hostname, HOSTNAME_SIZE)) |
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94 fputs(hostname, stdout); |
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95 |
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96 fputs(" login: ", stdout); |
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97 fflush(stdout); |
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98 |
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99 do { |
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100 buff[0] = getchar(); |
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101 if (buff[0] == EOF) |
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102 exit(EXIT_FAILURE); |
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103 } while (isblank(buff[0])); |
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104 |
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105 if (buff[0] != '\n') |
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106 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) |
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107 _exit(1); |
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108 |
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109 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) |
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110 { |
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111 i++; |
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112 } |
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113 buff[i] = 0; |
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114 } |
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115 |
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116 void handle_nologin(void) |
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117 { |
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118 int fd = open("/etc/nologin", O_RDONLY); |
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119 int size; |
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120 if (fd == -1) |
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121 return; |
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122 |
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123 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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124 toybuf[size] = 0; |
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125 if (!size) |
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126 puts("System closed for routine maintenance\n"); |
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127 else |
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128 puts(toybuf); |
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129 |
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130 close(fd); |
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131 fflush(stdout); |
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132 exit(EXIT_FAILURE); |
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133 } |
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134 |
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135 void handle_motd(void) |
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136 { |
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137 int fd = open("/etc/motd", O_RDONLY); |
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138 int size; |
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139 if (fd == -1) |
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140 return; |
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141 |
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142 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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143 toybuf[size] = 0; |
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144 puts(toybuf); |
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145 |
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146 close(fd); |
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147 fflush(stdout); |
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148 } |
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149 |
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150 int change_identity(const struct passwd *pwd) |
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151 { |
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152 if (initgroups(pwd->pw_name,pwd->pw_gid)) |
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153 return 1; |
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154 if (setgid(pwd->pw_uid)) |
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155 return 1; |
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156 if (setuid(pwd->pw_uid)) |
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157 return 1; |
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158 |
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159 return 0; |
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160 } |
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161 |
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162 void spawn_shell(const char *shell) |
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163 { |
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164 const char * exec_name = strrchr(shell,'/'); |
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165 if (exec_name) |
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166 exec_name++; |
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167 else |
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168 exec_name = shell; |
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169 |
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170 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell); |
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171 execl(shell, toybuf, NULL); |
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172 error_exit("Failed to spawn shell"); |
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173 } |
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174 |
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175 void setup_environment(const struct passwd *pwd, int clear_env) |
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176 { |
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177 if (chdir(pwd->pw_dir)) |
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178 printf("can't chdir to home directory: %s\n", pwd->pw_dir); |
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179 |
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180 if (clear_env) |
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181 { |
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182 const char * term = getenv("TERM"); |
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183 clearenv(); |
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184 if (term) setenv("TERM", term, 1); |
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185 } |
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186 |
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187 setenv("USER", pwd->pw_name, 1); |
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188 setenv("LOGNAME", pwd->pw_name, 1); |
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189 setenv("HOME", pwd->pw_dir, 1); |
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190 setenv("SHELL", pwd->pw_shell, 1); |
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191 } |
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192 |
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193 void login_main(void) |
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194 { |
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195 int f_flag = (toys.optflags & 4) >> 2; |
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196 int p_flag = (toys.optflags & 2) >> 1; |
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197 int h_flag = toys.optflags & 1; |
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198 char username[USER_NAME_MAX_SIZE+1]; |
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199 struct passwd * pwd = NULL; |
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200 struct spwd * spwd = NULL; |
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201 char *pass = NULL; |
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202 int auth_fail_cnt = 0; |
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203 |
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204 if (f_flag && toys.optc != 1) |
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205 error_exit("-f requires username"); |
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206 |
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207 if (geteuid() != 0 ) |
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208 error_exit("Cannot possibly work without effective root"); |
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209 |
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210 if (!isatty(0) || !isatty(1) || !isatty(2)) |
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211 error_exit("Not connected to a tty"); |
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212 |
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213 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH); |
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214 signal(SIGALRM, login_timeout_handler); |
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215 alarm(LOGIN_TIMEOUT); |
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216 sanitize_env(); |
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217 |
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218 while (1) { |
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219 tcflush(0, TCIFLUSH); |
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220 |
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221 username[USER_NAME_MAX_SIZE] = 0; |
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222 if (toys.optargs[0]) |
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223 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE); |
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224 else { |
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225 read_user(username, USER_NAME_MAX_SIZE+1); |
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226 if (username[0] == 0) |
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227 continue; |
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228 } |
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229 |
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230 pwd = getpwnam(username); |
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231 if (!pwd) |
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232 goto query_pass; // Non-existing user |
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233 |
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234 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*') |
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235 goto query_pass; // Locked account |
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236 |
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237 if (f_flag) |
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238 break; // Pre-authenticated |
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239 |
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240 if (pwd->pw_passwd[0] == '\0') |
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241 break; // Password-less account |
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242 |
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243 pass = pwd->pw_passwd; |
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244 if (pwd->pw_passwd[0] == 'x') { |
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245 spwd = getspnam (username); |
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246 if (spwd) |
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247 pass = spwd->sp_pwdp; |
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248 } |
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249 |
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250 query_pass: |
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251 if (!verify_password(pass)) |
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252 break; |
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253 |
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254 f_flag = 0; |
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255 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username, |
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256 ttyname(0), |
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257 (h_flag)?"from":"", |
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258 (h_flag)?TT.hostname:""); |
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259 |
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260 sleep(LOGIN_FAIL_TIMEOUT); |
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261 puts("Login incorrect"); |
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262 |
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263 if (++auth_fail_cnt == 3) |
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264 { |
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265 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt); |
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266 } |
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267 |
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268 username[0] = 0; |
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269 pwd = NULL; |
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270 spwd = NULL; |
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271 } |
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272 |
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273 alarm(0); |
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274 |
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275 if (pwd->pw_uid) |
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276 handle_nologin(); |
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277 |
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278 if (change_identity(pwd)) |
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279 error_exit("Failed to change identity"); |
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280 |
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281 setup_environment(pwd, !p_flag); |
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282 |
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283 handle_motd(); |
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284 |
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285 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name, |
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286 ttyname(0), |
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287 (h_flag)?"from":"", |
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288 (h_flag)?TT.hostname:""); |
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289 |
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290 spawn_shell(pwd->pw_shell); |
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291 } |