Mercurial > hg > toybox
annotate toys/login.c @ 632:6cafecf34728
Trivial cleanups.
author | Rob Landley <rob@landley.net> |
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date | Wed, 18 Jul 2012 21:10:57 -0500 |
parents | 8a88a9e3c30b |
children | 98bde84a888c |
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 read_password(char * buff, int buflen) |
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71 { |
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72 int i = 0; |
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73 struct termios termio, oldtermio; |
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74 tcgetattr(0, &oldtermio); |
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75 tcflush(0, TCIFLUSH); |
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76 termio = oldtermio; |
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77 |
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78 termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY); |
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79 termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP); |
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80 tcsetattr(0, TCSANOW, &termio); |
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81 |
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82 fputs("Password: ", stdout); |
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83 fflush(stdout); |
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84 |
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85 while (1) { |
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86 int ret = read(0, &buff[i], 1); |
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87 if ( ret < 0 ) |
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88 { |
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89 buff[0] = 0; |
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90 tcsetattr(0, TCSANOW, &oldtermio); |
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91 return 1; |
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92 } |
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93 else if ( ret == 0 || buff[i] == '\n' || |
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94 buff[i] == '\r' || buflen == i+1) |
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95 { |
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96 buff[i] = '\0'; |
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97 break; |
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98 } |
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99 i++; |
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100 } |
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101 |
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102 tcsetattr(0, TCSANOW, &oldtermio); |
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103 puts("\n"); |
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104 fflush(stdout); |
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105 return 0; |
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106 } |
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107 |
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108 int verify_password(char * pwd) |
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109 { |
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110 char * pass; |
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111 |
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112 if (read_password(toybuf, sizeof(toybuf))) |
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113 return 1; |
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114 if (!pwd) |
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115 return 1; |
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116 if (pwd[0] == '!' || pwd[0] == '*') |
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117 return 1; |
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118 |
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119 pass = crypt(toybuf, pwd); |
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120 if (pass != NULL && strcmp(pass, pwd)==0) |
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121 return 0; |
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122 |
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123 return 1; |
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124 } |
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125 |
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126 void read_user(char * buff, int size) |
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127 { |
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128 char hostname[HOSTNAME_SIZE+1]; |
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129 int i = 0; |
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130 hostname[HOSTNAME_SIZE] = 0; |
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131 if(!gethostname(hostname, HOSTNAME_SIZE)) |
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132 fputs(hostname, stdout); |
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133 |
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134 fputs(" login: ", stdout); |
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135 fflush(stdout); |
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136 |
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137 do { |
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138 buff[0] = getchar(); |
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139 if (buff[0] == EOF) |
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140 exit(EXIT_FAILURE); |
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141 } while (isblank(buff[0])); |
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142 |
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143 if (buff[0] != '\n') |
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144 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) |
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145 _exit(1); |
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146 |
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147 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) |
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148 { |
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149 i++; |
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150 } |
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151 buff[i] = 0; |
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152 } |
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153 |
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154 void handle_nologin(void) |
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155 { |
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156 int fd = open("/etc/nologin", O_RDONLY); |
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157 int size; |
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158 if (fd == -1) |
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159 return; |
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160 |
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161 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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162 toybuf[size] = 0; |
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163 if (!size) |
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164 puts("System closed for routine maintenance\n"); |
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165 else |
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166 puts(toybuf); |
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167 |
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168 close(fd); |
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169 fflush(stdout); |
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170 exit(EXIT_FAILURE); |
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171 } |
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172 |
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173 void handle_motd(void) |
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174 { |
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175 int fd = open("/etc/motd", O_RDONLY); |
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176 int size; |
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177 if (fd == -1) |
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178 return; |
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179 |
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180 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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181 toybuf[size] = 0; |
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182 puts(toybuf); |
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183 |
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184 close(fd); |
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185 fflush(stdout); |
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186 } |
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187 |
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188 int change_identity(const struct passwd *pwd) |
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189 { |
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190 if (initgroups(pwd->pw_name,pwd->pw_gid)) |
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191 return 1; |
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192 if (setgid(pwd->pw_uid)) |
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193 return 1; |
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194 if (setuid(pwd->pw_uid)) |
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195 return 1; |
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196 |
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197 return 0; |
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198 } |
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199 |
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200 void spawn_shell(const char *shell) |
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201 { |
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202 const char * exec_name = strrchr(shell,'/'); |
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203 if (exec_name) |
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204 exec_name++; |
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205 else |
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206 exec_name = shell; |
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207 |
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208 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell); |
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209 execl(shell, toybuf, NULL); |
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210 error_exit("Failed to spawn shell"); |
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211 } |
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212 |
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213 void setup_environment(const struct passwd *pwd, int clear_env) |
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214 { |
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215 if (chdir(pwd->pw_dir)) |
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216 printf("can't chdir to home directory: %s\n", pwd->pw_dir); |
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217 |
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218 if (clear_env) |
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219 { |
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220 const char * term = getenv("TERM"); |
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221 clearenv(); |
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222 if (term) setenv("TERM", term, 1); |
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223 } |
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224 |
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225 setenv("USER", pwd->pw_name, 1); |
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226 setenv("LOGNAME", pwd->pw_name, 1); |
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227 setenv("HOME", pwd->pw_dir, 1); |
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228 setenv("SHELL", pwd->pw_shell, 1); |
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229 } |
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230 |
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231 void login_main(void) |
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232 { |
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233 int f_flag = (toys.optflags & 4) >> 2; |
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234 int p_flag = (toys.optflags & 2) >> 1; |
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235 int h_flag = toys.optflags & 1; |
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236 char username[USER_NAME_MAX_SIZE+1]; |
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237 struct passwd * pwd = NULL; |
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238 struct spwd * spwd = NULL; |
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239 char *pass = NULL; |
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240 int auth_fail_cnt = 0; |
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241 |
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242 if (f_flag && toys.optc != 1) |
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243 error_exit("-f requires username"); |
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244 |
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245 if (geteuid() != 0 ) |
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246 error_exit("Cannot possibly work without effective root"); |
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247 |
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248 if (!isatty(0) || !isatty(1) || !isatty(2)) |
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249 error_exit("Not connected to a tty"); |
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250 |
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251 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH); |
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252 signal(SIGALRM, login_timeout_handler); |
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253 alarm(LOGIN_TIMEOUT); |
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254 sanitize_env(); |
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255 |
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256 while (1) { |
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257 tcflush(0, TCIFLUSH); |
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258 |
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259 username[USER_NAME_MAX_SIZE] = 0; |
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260 if (toys.optargs[0]) |
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261 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE); |
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262 else { |
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263 read_user(username, USER_NAME_MAX_SIZE+1); |
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264 if (username[0] == 0) |
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265 continue; |
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266 } |
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267 |
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268 pwd = getpwnam(username); |
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269 if (!pwd) |
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270 goto query_pass; // Non-existing user |
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271 |
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272 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*') |
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273 goto query_pass; // Locked account |
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274 |
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275 if (f_flag) |
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276 break; // Pre-authenticated |
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277 |
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278 if (pwd->pw_passwd[0] == '\0') |
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279 break; // Password-less account |
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280 |
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281 pass = pwd->pw_passwd; |
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282 if (pwd->pw_passwd[0] == 'x') { |
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283 spwd = getspnam (username); |
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284 if (spwd) |
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285 pass = spwd->sp_pwdp; |
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286 } |
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287 |
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288 query_pass: |
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289 if (!verify_password(pass)) |
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290 break; |
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291 |
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292 f_flag = 0; |
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293 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username, |
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294 ttyname(0), |
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295 (h_flag)?"from":"", |
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296 (h_flag)?TT.hostname:""); |
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297 |
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298 sleep(LOGIN_FAIL_TIMEOUT); |
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299 puts("Login incorrect"); |
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300 |
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301 if (++auth_fail_cnt == 3) |
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302 { |
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303 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt); |
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304 } |
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305 |
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306 username[0] = 0; |
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307 pwd = NULL; |
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308 spwd = NULL; |
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309 } |
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310 |
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311 alarm(0); |
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312 |
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313 if (pwd->pw_uid) |
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314 handle_nologin(); |
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315 |
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316 if (change_identity(pwd)) |
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317 error_exit("Failed to change identity"); |
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318 |
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319 setup_environment(pwd, !p_flag); |
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320 |
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321 handle_motd(); |
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322 |
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323 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name, |
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324 ttyname(0), |
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325 (h_flag)?"from":"", |
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326 (h_flag)?TT.hostname:""); |
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327 |
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328 spawn_shell(pwd->pw_shell); |
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329 } |