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0
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1 <?php
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2
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3 /**
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4 +-----------------------------------------------------------------------+
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5 | This file is part of the Roundcube Webmail client |
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6 | Copyright (C) 2005-2014, The Roundcube Dev Team |
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7 | Copyright (C) 2011, Kolab Systems AG |
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8 | |
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9 | Licensed under the GNU General Public License version 3 or |
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10 | any later version with exceptions for skins & plugins. |
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11 | See the README file for a full license statement. |
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12 | |
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13 | PURPOSE: |
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14 | Provide database supported session management |
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15 +-----------------------------------------------------------------------+
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16 | Author: Thomas Bruederli <roundcube@gmail.com> |
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17 | Author: Aleksander Machniak <alec@alec.pl> |
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18 | Author: Cor Bosman <cor@roundcu.be> |
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19 +-----------------------------------------------------------------------+
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20 */
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21
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22 /**
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23 * Abstract class to provide database supported session storage
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24 *
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25 * @package Framework
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26 * @subpackage Core
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27 * @author Thomas Bruederli <roundcube@gmail.com>
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28 * @author Aleksander Machniak <alec@alec.pl>
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29 */
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30 abstract class rcube_session
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31 {
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32 protected $config;
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33 protected $key;
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34 protected $ip;
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35 protected $changed;
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36 protected $start;
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37 protected $vars;
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38 protected $now;
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39 protected $time_diff = 0;
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40 protected $reloaded = false;
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41 protected $appends = array();
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42 protected $unsets = array();
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43 protected $gc_enabled = 0;
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44 protected $gc_handlers = array();
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45 protected $cookiename = 'roundcube_sessauth';
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46 protected $ip_check = false;
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47 protected $logging = false;
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48
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49
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50 /**
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51 * Blocks session data from being written to database.
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52 * Can be used if write-race conditions are to be expected
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53 * @var boolean
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54 */
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55 public $nowrite = false;
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56
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57 /**
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58 * Factory, returns driver-specific instance of the class
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59 *
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60 * @param object $config
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61 * @return Object rcube_session
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62 */
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63 public static function factory($config)
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64 {
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65 // get session storage driver
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66 $storage = $config->get('session_storage', 'db');
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67
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68 // class name for this storage
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69 $class = "rcube_session_" . $storage;
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70
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71 // try to instantiate class
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72 if (class_exists($class)) {
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73 return new $class($config);
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74 }
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75
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76 // no storage found, raise error
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77 rcube::raise_error(array('code' => 604, 'type' => 'session',
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78 'line' => __LINE__, 'file' => __FILE__,
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79 'message' => "Failed to find session driver. Check session_storage config option"),
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80 true, true);
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81 }
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82
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83 /**
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84 * @param Object $config
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85 */
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86 public function __construct($config)
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87 {
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88 $this->config = $config;
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89
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90 // set ip check
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91 $this->set_ip_check($this->config->get('ip_check'));
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92
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93 // set cookie name
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94 if ($this->config->get('session_auth_name')) {
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95 $this->set_cookiename($this->config->get('session_auth_name'));
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96 }
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97 }
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98
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99 /**
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100 * register session handler
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101 */
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102 public function register_session_handler()
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103 {
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104 ini_set('session.serialize_handler', 'php');
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105
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106 // set custom functions for PHP session management
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107 session_set_save_handler(
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108 array($this, 'open'),
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109 array($this, 'close'),
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110 array($this, 'read'),
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111 array($this, 'sess_write'),
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112 array($this, 'destroy'),
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113 array($this, 'gc')
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114 );
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115 }
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116
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117 /**
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118 * Wrapper for session_start()
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119 */
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120 public function start()
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121 {
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122 $this->start = microtime(true);
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123 $this->ip = rcube_utils::remote_addr();
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124 $this->logging = $this->config->get('log_session', false);
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125
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126 $lifetime = $this->config->get('session_lifetime', 1) * 60;
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127 $this->set_lifetime($lifetime);
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128
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129 session_start();
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130 }
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131
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132 /**
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133 * Abstract methods should be implemented by driver classes
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134 */
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135 abstract function open($save_path, $session_name);
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136 abstract function close();
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137 abstract function destroy($key);
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138 abstract function read($key);
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139 abstract function write($key, $vars);
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140 abstract function update($key, $newvars, $oldvars);
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141
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142 /**
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143 * session write handler. This calls the implementation methods for write/update after some initial checks.
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144 *
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145 * @param $key
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146 * @param $vars
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147 *
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148 * @return bool
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149 */
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150 public function sess_write($key, $vars)
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151 {
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152 if ($this->nowrite) {
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153 return true;
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154 }
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155
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156 // check cache
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157 $oldvars = $this->get_cache($key);
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158
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159 // if there are cached vars, update store, else insert new data
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160 if ($oldvars) {
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161 $newvars = $this->_fixvars($vars, $oldvars);
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162 return $this->update($key, $newvars, $oldvars);
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163 }
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164 else {
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165 return $this->write($key, $vars);
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166 }
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167 }
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168
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169 /**
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170 * Wrapper for session_write_close()
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171 */
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172 public function write_close()
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173 {
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174 session_write_close();
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175
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176 // write_close() is called on script shutdown, see rcube::shutdown()
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177 // execute cleanup functionality if enabled by session gc handler
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178 // we do this after closing the session for better performance
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179 $this->gc_shutdown();
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180 }
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181
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182 /**
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183 * Creates a new (separate) session
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184 *
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185 * @param array Session data
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186 *
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187 * @return string Session identifier (on success)
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188 */
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189 public function create($data)
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190 {
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191 $length = strlen(session_id());
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192 $key = rcube_utils::random_bytes($length);
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193
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194 // create new session
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195 if ($this->write($key, $this->serialize($data))) {
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196 return $key;
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197 }
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198 }
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199
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200 /**
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201 * Merge vars with old vars and apply unsets
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202 */
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203 protected function _fixvars($vars, $oldvars)
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204 {
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205 if ($oldvars !== null) {
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206 $a_oldvars = $this->unserialize($oldvars);
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207 if (is_array($a_oldvars)) {
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208 // remove unset keys on oldvars
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209 foreach ((array)$this->unsets as $var) {
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210 if (isset($a_oldvars[$var])) {
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211 unset($a_oldvars[$var]);
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212 }
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213 else {
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214 $path = explode('.', $var);
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215 $k = array_pop($path);
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216 $node = &$this->get_node($path, $a_oldvars);
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217 unset($node[$k]);
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218 }
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219 }
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220
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221 $newvars = $this->serialize(array_merge(
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222 (array)$a_oldvars, (array)$this->unserialize($vars)));
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223 }
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224 else {
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225 $newvars = $vars;
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226 }
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227 }
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228
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229 $this->unsets = array();
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230 return $newvars;
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231 }
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232
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233 /**
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234 * Execute registered garbage collector routines
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235 */
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236 public function gc($maxlifetime)
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237 {
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238 // move gc execution to the script shutdown function
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239 // see rcube::shutdown() and rcube_session::write_close()
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240 $this->gc_enabled = $maxlifetime;
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241
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242 return true;
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243 }
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244
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245 /**
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246 * Register additional garbage collector functions
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247 *
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248 * @param mixed Callback function
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249 */
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250 public function register_gc_handler($func)
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251 {
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252 foreach ($this->gc_handlers as $handler) {
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253 if ($handler == $func) {
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254 return;
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255 }
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256 }
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257
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258 $this->gc_handlers[] = $func;
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259 }
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260
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261 /**
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262 * Garbage collector handler to run on script shutdown
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263 */
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264 protected function gc_shutdown()
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265 {
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266 if ($this->gc_enabled) {
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267 foreach ($this->gc_handlers as $fct) {
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268 call_user_func($fct);
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269 }
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270 }
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271 }
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272
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273 /**
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274 * Generate and set new session id
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275 *
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276 * @param boolean $destroy If enabled the current session will be destroyed
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277 * @return bool
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278 */
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279 public function regenerate_id($destroy=true)
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280 {
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281 session_regenerate_id($destroy);
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282
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283 $this->vars = null;
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284 $this->key = session_id();
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285
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286 return true;
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287 }
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288
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289 /**
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290 * See if we have vars of this key already cached, and if so, return them.
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291 *
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292 * @param string $key Session ID
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293 *
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294 * @return string
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295 */
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296 protected function get_cache($key)
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297 {
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298 // no session data in cache (read() returns false)
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299 if (!$this->key) {
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300 $cache = null;
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301 }
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302 // use internal data for fast requests (up to 0.5 sec.)
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303 else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) {
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304 $cache = $this->vars;
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305 }
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306 else { // else read data again
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307 $cache = $this->read($key);
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308 }
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309
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310 return $cache;
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311 }
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312
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313 /**
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314 * Append the given value to the certain node in the session data array
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315 *
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316 * Warning: Do not use if you already modified $_SESSION in the same request (#1490608)
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317 *
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318 * @param string Path denoting the session variable where to append the value
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319 * @param string Key name under which to append the new value (use null for appending to an indexed list)
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320 * @param mixed Value to append to the session data array
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321 */
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322 public function append($path, $key, $value)
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323 {
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324 // re-read session data from DB because it might be outdated
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325 if (!$this->reloaded && microtime(true) - $this->start > 0.5) {
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326 $this->reload();
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327 $this->reloaded = true;
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328 $this->start = microtime(true);
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329 }
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330
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331 $node = &$this->get_node(explode('.', $path), $_SESSION);
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332
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333 if ($key !== null) {
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334 $node[$key] = $value;
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335 $path .= '.' . $key;
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336 }
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337 else {
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338 $node[] = $value;
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339 }
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340
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341 $this->appends[] = $path;
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342
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343 // when overwriting a previously unset variable
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344 if ($this->unsets[$path]) {
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345 unset($this->unsets[$path]);
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346 }
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347 }
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348
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349 /**
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350 * Unset a session variable
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351 *
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352 * @param string Variable name (can be a path denoting a certain node in the session array, e.g. compose.attachments.5)
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353 * @return boolean True on success
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354 */
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355 public function remove($var=null)
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356 {
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357 if (empty($var)) {
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358 return $this->destroy(session_id());
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359 }
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360
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361 $this->unsets[] = $var;
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362
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363 if (isset($_SESSION[$var])) {
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364 unset($_SESSION[$var]);
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365 }
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366 else {
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367 $path = explode('.', $var);
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368 $key = array_pop($path);
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369 $node = &$this->get_node($path, $_SESSION);
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370 unset($node[$key]);
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371 }
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372
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373 return true;
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374 }
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375
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376 /**
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377 * Kill this session
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378 */
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379 public function kill()
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380 {
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381 $this->vars = null;
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382 $this->ip = rcube_utils::remote_addr(); // update IP (might have changed)
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383 $this->destroy(session_id());
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384 rcube_utils::setcookie($this->cookiename, '-del-', time() - 60);
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385 }
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386
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387 /**
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388 * Re-read session data from storage backend
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389 */
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390 public function reload()
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391 {
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392 // collect updated data from previous appends
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393 $merge_data = array();
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394 foreach ((array)$this->appends as $var) {
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395 $path = explode('.', $var);
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396 $value = $this->get_node($path, $_SESSION);
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397 $k = array_pop($path);
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398 $node = &$this->get_node($path, $merge_data);
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399 $node[$k] = $value;
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400 }
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401
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402 if ($this->key) {
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403 $data = $this->read($this->key);
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404 }
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405
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406 if ($data) {
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407 session_decode($data);
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408
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409 // apply appends and unsets to reloaded data
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410 $_SESSION = array_merge_recursive($_SESSION, $merge_data);
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411
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412 foreach ((array)$this->unsets as $var) {
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413 if (isset($_SESSION[$var])) {
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414 unset($_SESSION[$var]);
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415 }
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416 else {
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417 $path = explode('.', $var);
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418 $k = array_pop($path);
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419 $node = &$this->get_node($path, $_SESSION);
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420 unset($node[$k]);
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421 }
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422 }
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423 }
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424 }
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425
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426 /**
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427 * Returns a reference to the node in data array referenced by the given path.
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428 * e.g. ['compose','attachments'] will return $_SESSION['compose']['attachments']
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429 */
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430 protected function &get_node($path, &$data_arr)
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431 {
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432 $node = &$data_arr;
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433 if (!empty($path)) {
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434 foreach ((array)$path as $key) {
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435 if (!isset($node[$key]))
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436 $node[$key] = array();
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437 $node = &$node[$key];
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438 }
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439 }
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440
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441 return $node;
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442 }
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443
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444 /**
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445 * Serialize session data
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446 */
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447 protected function serialize($vars)
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448 {
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449 $data = '';
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450 if (is_array($vars)) {
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451 foreach ($vars as $var=>$value)
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452 $data .= $var.'|'.serialize($value);
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453 }
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454 else {
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455 $data = 'b:0;';
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456 }
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457
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458 return $data;
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459 }
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460
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461 /**
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462 * Unserialize session data
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463 * http://www.php.net/manual/en/function.session-decode.php#56106
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464 */
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465 protected function unserialize($str)
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466 {
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467 $str = (string)$str;
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468 $endptr = strlen($str);
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469 $p = 0;
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470
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471 $serialized = '';
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472 $items = 0;
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473 $level = 0;
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474
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475 while ($p < $endptr) {
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476 $q = $p;
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477 while ($str[$q] != '|')
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478 if (++$q >= $endptr)
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479 break 2;
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480
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481 if ($str[$p] == '!') {
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482 $p++;
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483 $has_value = false;
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484 }
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485 else {
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486 $has_value = true;
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487 }
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488
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489 $name = substr($str, $p, $q - $p);
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490 $q++;
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491
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492 $serialized .= 's:' . strlen($name) . ':"' . $name . '";';
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493
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494 if ($has_value) {
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495 for (;;) {
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496 $p = $q;
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497 switch (strtolower($str[$q])) {
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498 case 'n': // null
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499 case 'b': // boolean
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500 case 'i': // integer
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501 case 'd': // decimal
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502 do $q++;
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503 while ( ($q < $endptr) && ($str[$q] != ';') );
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504 $q++;
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505 $serialized .= substr($str, $p, $q - $p);
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506 if ($level == 0)
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507 break 2;
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508 break;
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509 case 'r': // reference
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510 $q+= 2;
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511 for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++)
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512 $id .= $str[$q];
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513 $q++;
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514 // increment pointer because of outer array
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515 $serialized .= 'R:' . ($id + 1) . ';';
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516 if ($level == 0)
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|
517 break 2;
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518 break;
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|
|
519 case 's': // string
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|
520 $q+=2;
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|
521 for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++)
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522 $length .= $str[$q];
|
|
|
523 $q+=2;
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|
|
524 $q+= (int)$length + 2;
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|
|
525 $serialized .= substr($str, $p, $q - $p);
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526 if ($level == 0)
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|
|
527 break 2;
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|
|
528 break;
|
|
|
529 case 'a': // array
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|
|
530 case 'o': // object
|
|
|
531 do $q++;
|
|
|
532 while ($q < $endptr && $str[$q] != '{');
|
|
|
533 $q++;
|
|
|
534 $level++;
|
|
|
535 $serialized .= substr($str, $p, $q - $p);
|
|
|
536 break;
|
|
|
537 case '}': // end of array|object
|
|
|
538 $q++;
|
|
|
539 $serialized .= substr($str, $p, $q - $p);
|
|
|
540 if (--$level == 0)
|
|
|
541 break 2;
|
|
|
542 break;
|
|
|
543 default:
|
|
|
544 return false;
|
|
|
545 }
|
|
|
546 }
|
|
|
547 }
|
|
|
548 else {
|
|
|
549 $serialized .= 'N;';
|
|
|
550 $q += 2;
|
|
|
551 }
|
|
|
552 $items++;
|
|
|
553 $p = $q;
|
|
|
554 }
|
|
|
555
|
|
|
556 return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
|
|
|
557 }
|
|
|
558
|
|
|
559 /**
|
|
|
560 * Setter for session lifetime
|
|
|
561 */
|
|
|
562 public function set_lifetime($lifetime)
|
|
|
563 {
|
|
|
564 $this->lifetime = max(120, $lifetime);
|
|
|
565
|
|
|
566 // valid time range is now - 1/2 lifetime to now + 1/2 lifetime
|
|
|
567 $now = time();
|
|
|
568 $this->now = $now - ($now % ($this->lifetime / 2));
|
|
|
569 }
|
|
|
570
|
|
|
571 /**
|
|
|
572 * Getter for remote IP saved with this session
|
|
|
573 */
|
|
|
574 public function get_ip()
|
|
|
575 {
|
|
|
576 return $this->ip;
|
|
|
577 }
|
|
|
578
|
|
|
579 /**
|
|
|
580 * Setter for cookie encryption secret
|
|
|
581 */
|
|
|
582 function set_secret($secret = null)
|
|
|
583 {
|
|
|
584 // generate random hash and store in session
|
|
|
585 if (!$secret) {
|
|
|
586 if (!empty($_SESSION['auth_secret'])) {
|
|
|
587 $secret = $_SESSION['auth_secret'];
|
|
|
588 }
|
|
|
589 else {
|
|
|
590 $secret = rcube_utils::random_bytes(strlen($this->key));
|
|
|
591 }
|
|
|
592 }
|
|
|
593
|
|
|
594 $_SESSION['auth_secret'] = $secret;
|
|
|
595 }
|
|
|
596
|
|
|
597 /**
|
|
|
598 * Enable/disable IP check
|
|
|
599 */
|
|
|
600 function set_ip_check($check)
|
|
|
601 {
|
|
|
602 $this->ip_check = $check;
|
|
|
603 }
|
|
|
604
|
|
|
605 /**
|
|
|
606 * Setter for the cookie name used for session cookie
|
|
|
607 */
|
|
|
608 function set_cookiename($cookiename)
|
|
|
609 {
|
|
|
610 if ($cookiename) {
|
|
|
611 $this->cookiename = $cookiename;
|
|
|
612 }
|
|
|
613 }
|
|
|
614
|
|
|
615 /**
|
|
|
616 * Check session authentication cookie
|
|
|
617 *
|
|
|
618 * @return boolean True if valid, False if not
|
|
|
619 */
|
|
|
620 function check_auth()
|
|
|
621 {
|
|
|
622 $this->cookie = $_COOKIE[$this->cookiename];
|
|
|
623 $result = $this->ip_check ? rcube_utils::remote_addr() == $this->ip : true;
|
|
|
624
|
|
|
625 if (!$result) {
|
|
|
626 $this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . rcube_utils::remote_addr());
|
|
|
627 }
|
|
|
628
|
|
|
629 if ($result && $this->_mkcookie($this->now) != $this->cookie) {
|
|
|
630 $this->log("Session auth check failed for " . $this->key . "; timeslot = " . date('Y-m-d H:i:s', $this->now));
|
|
|
631 $result = false;
|
|
|
632
|
|
|
633 // Check if using id from a previous time slot
|
|
|
634 for ($i = 1; $i <= 2; $i++) {
|
|
|
635 $prev = $this->now - ($this->lifetime / 2) * $i;
|
|
|
636 if ($this->_mkcookie($prev) == $this->cookie) {
|
|
|
637 $this->log("Send new auth cookie for " . $this->key . ": " . $this->cookie);
|
|
|
638 $this->set_auth_cookie();
|
|
|
639 $result = true;
|
|
|
640 }
|
|
|
641 }
|
|
|
642 }
|
|
|
643
|
|
|
644 if (!$result) {
|
|
|
645 $this->log("Session authentication failed for " . $this->key
|
|
|
646 . "; invalid auth cookie sent; timeslot = " . date('Y-m-d H:i:s', $prev));
|
|
|
647 }
|
|
|
648
|
|
|
649 return $result;
|
|
|
650 }
|
|
|
651
|
|
|
652 /**
|
|
|
653 * Set session authentication cookie
|
|
|
654 */
|
|
|
655 public function set_auth_cookie()
|
|
|
656 {
|
|
|
657 $this->cookie = $this->_mkcookie($this->now);
|
|
|
658 rcube_utils::setcookie($this->cookiename, $this->cookie, 0);
|
|
|
659 $_COOKIE[$this->cookiename] = $this->cookie;
|
|
|
660 }
|
|
|
661
|
|
|
662 /**
|
|
|
663 * Create session cookie for specified time slot.
|
|
|
664 *
|
|
|
665 * @param int Time slot to use
|
|
|
666 *
|
|
|
667 * @return string
|
|
|
668 */
|
|
|
669 protected function _mkcookie($timeslot)
|
|
|
670 {
|
|
|
671 // make sure the secret key exists
|
|
|
672 $this->set_secret();
|
|
|
673
|
|
|
674 // no need to hash this, it's just a random string
|
|
|
675 return $_SESSION['auth_secret'] . '-' . $timeslot;
|
|
|
676 }
|
|
|
677
|
|
|
678 /**
|
|
|
679 * Writes debug information to the log
|
|
|
680 */
|
|
|
681 function log($line)
|
|
|
682 {
|
|
|
683 if ($this->logging) {
|
|
|
684 rcube::write_log('session', $line);
|
|
|
685 }
|
|
|
686 }
|
|
|
687 }
|
