1 | <?php |
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2 | /**************************************************************************\ |
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3 | * eGroupWare API - Crypto * |
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4 | * This file written by Joseph Engo <jengo@phpgroupware.org> * |
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5 | * Handles encrypting strings based on various encryption schemes * |
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6 | * Copyright (C) 2000, 2001 Dan Kuykendall * |
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7 | * -------------------------------------------------------------------------* |
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8 | * This library is part of the eGroupWare API * |
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9 | * http://www.egroupware.org/api * |
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10 | * -------------------------------------------------------------------------* |
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11 | * This library is free software; you can redistribute it and/or modify it * |
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12 | * under the terms of the GNU Lesser General Public License as published by * |
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13 | * the Free Software Foundation; either version 2.1 of the License, * |
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14 | * or any later version. * |
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15 | * This library is distributed in the hope that it will be useful, but * |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of * |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * |
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18 | * See the GNU Lesser General Public License for more details. * |
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19 | * You should have received a copy of the GNU Lesser General Public License * |
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20 | * along with this library; if not, write to the Free Software Foundation, * |
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21 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * |
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22 | \**************************************************************************/ |
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23 | |
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24 | |
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25 | class crypto |
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26 | { |
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27 | var $enabled = False; |
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28 | var $debug = False; |
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29 | |
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30 | var $mcrypt_version = ''; |
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31 | var $algo = MCRYPT_TRIPLEDES; |
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32 | var $mode = MCRYPT_MODE_CBC; |
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33 | var $td = False; /* Handle for mcrypt */ |
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34 | var $iv = ''; |
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35 | var $key = ''; |
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36 | |
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37 | function crypto($vars='') |
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38 | { |
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39 | if($GLOBALS['phpgw_info']['flags']['currentapp'] == 'login' || |
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40 | $GLOBALS['phpgw_info']['flags']['currentapp'] == 'logout' || |
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41 | $GLOBALS['phpgw_info']['flags']['currentapp'] == 'home' |
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42 | ) |
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43 | { |
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44 | $this->debug = False; |
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45 | } |
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46 | if(is_array($vars)) |
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47 | { |
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48 | $this->init($vars); |
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49 | } |
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50 | } |
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51 | |
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52 | function init($vars) |
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53 | { |
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54 | /* _debug_array(mcrypt_list_algorithms()); */ |
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55 | $key = $vars[0]; |
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56 | $iv = $vars[1]; |
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57 | |
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58 | if($GLOBALS['phpgw_info']['server']['mcrypt_enabled'] && extension_loaded('mcrypt')) |
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59 | { |
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60 | if($GLOBALS['phpgw_info']['server']['mcrypt_algo']) |
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61 | { |
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62 | $this->algo = $GLOBALS['phpgw_info']['server']['mcrypt_algo']; |
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63 | } |
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64 | if($GLOBALS['phpgw_info']['server']['mcrypt_mode']) |
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65 | { |
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66 | $this->mode = $GLOBALS['phpgw_info']['server']['mcrypt_mode']; |
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67 | } |
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68 | |
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69 | if($this->debug) |
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70 | { |
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71 | echo '<br>crypto: algorithm=' . $this->algo; |
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72 | echo '<br>crypto: mode =' . $this->mode; |
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73 | } |
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74 | |
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75 | $this->enabled = True; |
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76 | $this->mcrypt_version = $GLOBALS['phpgw_info']['server']['versions']['mcrypt']; |
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77 | if($this->mcrypt_version == 'old') |
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78 | { |
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79 | $this->td = False; |
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80 | if(phpversion() > '4.0.2pl1') |
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81 | { |
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82 | $keysize = mcrypt_get_key_size($this->algo); |
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83 | $ivsize = mcrypt_get_iv_size($this->algo,$this->mode); |
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84 | } |
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85 | else |
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86 | { |
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87 | $keysize = 8; |
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88 | $ivsize = 8; |
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89 | } |
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90 | } |
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91 | else |
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92 | { |
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93 | /* Start up mcrypt */ |
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94 | $this->td = mcrypt_module_open($this->algo, '', $this->mode, ''); |
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95 | |
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96 | $ivsize = mcrypt_enc_get_iv_size($this->td); |
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97 | $keysize = mcrypt_enc_get_key_size($this->td); |
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98 | } |
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99 | |
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100 | /* Hack IV to be the correct size */ |
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101 | $x = strlen($iv); |
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102 | $this->iv = ''; |
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103 | for($i = 0; $i < $ivsize; $i++) |
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104 | { |
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105 | $this->iv .= $iv[$i % $x]; |
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106 | } |
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107 | |
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108 | /* Hack Key to be the correct size */ |
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109 | $x = strlen($key); |
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110 | $this->key = ''; |
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111 | for($i = 0; $i < $keysize; $i++) |
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112 | { |
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113 | $this->key .= $key[$i % $x]; |
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114 | } |
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115 | } |
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116 | else |
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117 | { |
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118 | /* If mcrypt isn't loaded, key and iv are not needed. */ |
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119 | if($this->debug) |
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120 | { |
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121 | echo '<br>crypto: mycrypt unavailable or disabled'; |
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122 | } |
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123 | } |
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124 | } |
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125 | |
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126 | function cleanup() |
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127 | { |
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128 | if($this->enabled) |
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129 | { |
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130 | if($this->mcrypt_version != 'old') |
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131 | { |
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132 | if(function_exists('mcrypt_generic_deinit')) |
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133 | { |
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134 | mcrypt_generic_deinit($this->td); |
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135 | } |
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136 | else |
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137 | { |
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138 | mcrypt_generic_end($this->td); |
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139 | } |
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140 | } |
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141 | } |
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142 | } |
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143 | |
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144 | function hex2bin($data) |
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145 | { |
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146 | $len = strlen($data); |
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147 | return pack('H'.$len, $data); |
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148 | } |
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149 | |
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150 | function encrypt($data) |
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151 | { |
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152 | if($this->debug) |
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153 | { |
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154 | echo '<br>' . time() . ' crypto->encrypt() unencrypted data: ---->>>>' . $data . "\n"; |
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155 | } |
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156 | |
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157 | if(is_array($data) || is_object($data)) |
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158 | { |
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159 | if($this->debug) |
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160 | { |
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161 | echo '<br>' . time() . ' crypto->encrypt() found an "' . gettype($data) . '". Serializing...' . "\n"; |
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162 | } |
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163 | $data = serialize($data); |
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164 | $_obj = True; |
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165 | } |
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166 | else |
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167 | { |
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168 | if($this->debug) |
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169 | { |
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170 | echo '<br>' . time() . ' crypto->encrypt() found "' . gettype($data) . '". No serialization...' . "\n"; |
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171 | } |
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172 | } |
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173 | |
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174 | /* Disable all encryption if the admin didn't set it up */ |
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175 | if($this->enabled) |
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176 | { |
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177 | if($_obj) |
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178 | { |
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179 | if($this->debug) |
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180 | { |
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181 | echo '<br>' . time() . ' crypto->encrypt() adding slashes' . "\n"; |
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182 | } |
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183 | $data = addslashes($data); |
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184 | } |
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185 | |
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186 | if($this->debug) |
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187 | { |
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188 | echo '<br>' . time() . ' crypto->encrypt() data: ---->>>>' . $data; |
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189 | } |
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190 | |
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191 | switch($this->mcrypt_version) |
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192 | { |
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193 | case 'old': |
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194 | /* The old code, only works with mcrypt <= 2.2.x */ |
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195 | $encrypteddata = mcrypt_cbc($this->algo, $this->key, $data, MCRYPT_ENCRYPT); |
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196 | break; |
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197 | default: |
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198 | /* Handle 2.4 and newer API */ |
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199 | mcrypt_generic_init($this->td, $this->key, $this->iv); |
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200 | $encrypteddata = mcrypt_generic($this->td, $data); |
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201 | break; |
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202 | } |
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203 | $encrypteddata = bin2hex($encrypteddata); |
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204 | if($this->debug) |
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205 | { |
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206 | echo '<br>' . time() . ' crypto->encrypt() crypted data: ---->>>>' . $encrypteddata; |
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207 | } |
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208 | return $encrypteddata; |
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209 | } |
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210 | else |
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211 | { |
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212 | /* No mcrypt == insecure ! */ |
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213 | if($this->debug) |
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214 | { |
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215 | echo '<br>' . time() . ' crypto->encrypt() crypted data: ---->>>>' . $data; |
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216 | } |
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217 | return $data; |
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218 | } |
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219 | } |
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220 | |
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221 | function decrypt($encrypteddata) |
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222 | { |
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223 | if($this->debug) |
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224 | { |
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225 | echo '<br>' . time() . ' crypto->decrypt() crypted data: ---->>>>' . $encrypteddata; |
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226 | } |
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227 | /* Disable all encryption if the admin didn't set it up */ |
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228 | if($this->enabled) |
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229 | { |
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230 | $data = $this->hex2bin($encrypteddata); |
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231 | switch($this->mcrypt_version) |
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232 | { |
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233 | case 'old': |
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234 | /* The old code, only works with mcrypt <= 2.2.x */ |
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235 | $data = mcrypt_cbc($this->algo, $this->key, $data, MCRYPT_DECRYPT); |
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236 | break; |
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237 | default: |
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238 | /* Handle 2.4 and newer API */ |
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239 | mcrypt_generic_init($this->td, $this->key, $this->iv); |
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240 | $data = mdecrypt_generic($this->td, $data); |
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241 | break; |
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242 | } |
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243 | |
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244 | if($this->debug) |
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245 | { |
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246 | echo '<br>' . time() . ' crypto->decrypt() decrypted data: ---->>>>' . $data; |
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247 | } |
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248 | $test = stripslashes($data); |
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249 | if(@unserialize($test)) |
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250 | { |
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251 | if($this->debug) |
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252 | { |
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253 | echo '<br>' . time() . ' crypto->decrypt() stripping slashes' . "\n"; |
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254 | } |
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255 | $data = $test; |
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256 | } |
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257 | unset($test); |
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258 | |
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259 | if($this->debug) |
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260 | { |
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261 | echo '<br>' . time() . ' crypto->decrypt() data: ---->>>>' . $data . "\n"; |
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262 | } |
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263 | } |
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264 | else |
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265 | { |
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266 | /* No mcrypt == insecure ! */ |
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267 | $data = $encrypteddata; |
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268 | } |
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269 | |
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270 | // Fix strange bug |
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271 | // Without this, somes ^@^@^@^@ appears in data |
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272 | $data = chop($data); |
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273 | |
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274 | $newdata = @unserialize($data); |
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275 | if($newdata) |
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276 | { |
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277 | if($this->debug) |
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278 | { |
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279 | echo '<br>' . time() . ' crypto->decrypt() found serialized "' . gettype($newdata) . '". Unserializing...' . "\n"; |
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280 | echo '<br>' . time() . ' crypto->decrypt() returning: '; _debug_array($newdata); |
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281 | } |
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282 | return $newdata; |
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283 | } |
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284 | else |
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285 | { |
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286 | if($this->debug) |
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287 | { |
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288 | echo '<br>' . time() . ' crypto->decrypt() found UNserialized "' . gettype($data) . '". No unserialization...' . "\n"; |
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289 | echo '<br>' . time() . ' crypto->decrypt() returning: ' . $data; |
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290 | } |
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291 | return $data; |
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292 | } |
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293 | } |
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294 | } // class crypto |
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295 | ?> |
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