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2 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
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4 | * OIDplus 2.0 |
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511 | daniel-mar | 5 | * Copyright 2019 - 2021 Daniel Marschall, ViaThinkSoft |
2 | daniel-mar | 6 | * |
7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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8 | * you may not use this file except in compliance with the License. |
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9 | * You may obtain a copy of the License at |
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10 | * |
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11 | * http://www.apache.org/licenses/LICENSE-2.0 |
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12 | * |
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13 | * Unless required by applicable law or agreed to in writing, software |
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14 | * distributed under the License is distributed on an "AS IS" BASIS, |
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15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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16 | * See the License for the specific language governing permissions and |
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17 | * limitations under the License. |
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18 | */ |
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19 | |||
511 | daniel-mar | 20 | if (!defined('INSIDE_OIDPLUS')) die(); |
21 | |||
2 | daniel-mar | 22 | class OIDplusSessionHandler { |
23 | |||
263 | daniel-mar | 24 | private $secret = ''; |
25 | protected $sessionLifetime = ''; |
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426 | daniel-mar | 26 | public $simulate = false; |
2 | daniel-mar | 27 | |
263 | daniel-mar | 28 | public function __construct() { |
261 | daniel-mar | 29 | $this->sessionLifetime = OIDplus::baseConfig()->getValue('SESSION_LIFETIME', 30*60); |
30 | $this->secret = OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
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31 | |||
2 | daniel-mar | 32 | // **PREVENTING SESSION HIJACKING** |
33 | // Prevents javascript XSS attacks aimed to steal the session ID |
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87 | daniel-mar | 34 | @ini_set('session.cookie_httponly', 1); |
2 | daniel-mar | 35 | |
36 | // **PREVENTING SESSION FIXATION** |
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37 | // Session ID cannot be passed through URLs |
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87 | daniel-mar | 38 | @ini_set('session.use_only_cookies', 1); |
2 | daniel-mar | 39 | |
87 | daniel-mar | 40 | @ini_set('session.use_trans_sid', 0); |
85 | daniel-mar | 41 | |
2 | daniel-mar | 42 | // Uses a secure connection (HTTPS) if possible |
230 | daniel-mar | 43 | @ini_set('session.cookie_secure', OIDplus::isSslAvailable()); |
2 | daniel-mar | 44 | |
496 | daniel-mar | 45 | $path = OIDplus::webpath(null,true); |
555 | daniel-mar | 46 | if (empty($path)) $path = '/'; |
47 | @ini_set('session.cookie_path', $path); |
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2 | daniel-mar | 48 | |
555 | daniel-mar | 49 | @ini_set('session.cookie_samesite', 'Strict'); |
2 | daniel-mar | 50 | |
87 | daniel-mar | 51 | @ini_set('session.use_strict_mode', 1); |
2 | daniel-mar | 52 | |
261 | daniel-mar | 53 | @ini_set('session.gc_maxlifetime', $this->sessionLifetime); |
2 | daniel-mar | 54 | } |
55 | |||
86 | daniel-mar | 56 | protected function sessionSafeStart() { |
179 | daniel-mar | 57 | if (!isset($_SESSION)) { |
58 | // TODO: session_name() makes some problems. Leave it away for now. |
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261 | daniel-mar | 59 | //session_name('OIDplus_SESHDLR'); |
179 | daniel-mar | 60 | if (!session_start()) { |
360 | daniel-mar | 61 | throw new OIDplusException(_L('Session could not be started')); |
179 | daniel-mar | 62 | } |
63 | } |
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86 | daniel-mar | 64 | |
87 | daniel-mar | 65 | if (!isset($_SESSION['ip'])) { |
66 | if (!isset($_SERVER['REMOTE_ADDR'])) return; |
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86 | daniel-mar | 67 | |
87 | daniel-mar | 68 | // Remember the IP address of the user |
69 | $_SESSION['ip'] = $_SERVER['REMOTE_ADDR']; |
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70 | } else { |
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71 | if ($_SERVER['REMOTE_ADDR'] != $_SESSION['ip']) { |
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72 | // Was the session hijacked?! Get out of here! |
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435 | daniel-mar | 73 | |
74 | // We don't use $this->destroySession(), because this calls sessionSafeStart() again |
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75 | $_SESSION = array(); |
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76 | session_destroy(); |
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77 | session_write_close(); |
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557 | daniel-mar | 78 | OIDplus::cookieUtils()->unsetcookie(session_name()); // remove cookie, so GDPR people are happy |
87 | daniel-mar | 79 | } |
86 | daniel-mar | 80 | } |
81 | } |
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82 | |||
2 | daniel-mar | 83 | function __destruct() { |
84 | session_write_close(); |
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85 | } |
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86 | |||
424 | daniel-mar | 87 | private $cacheSetValues = array(); // Important if you do a setValue() followed by an getValue() |
88 | |||
2 | daniel-mar | 89 | public function setValue($name, $value) { |
426 | daniel-mar | 90 | $this->cacheSetValues[$name] = self::encrypt($value, $this->secret); |
91 | if ($this->simulate) return; |
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92 | |||
86 | daniel-mar | 93 | $this->sessionSafeStart(); |
557 | daniel-mar | 94 | OIDplus::cookieUtils()->setcookie(session_name(),session_id(),time()+$this->sessionLifetime); |
85 | daniel-mar | 95 | |
2 | daniel-mar | 96 | $_SESSION[$name] = self::encrypt($value, $this->secret); |
97 | } |
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98 | |||
99 | public function getValue($name) { |
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424 | daniel-mar | 100 | if (isset($this->cacheSetValues[$name])) return self::decrypt($this->cacheSetValues[$name], $this->secret); |
426 | daniel-mar | 101 | if ($this->simulate) return null; |
424 | daniel-mar | 102 | |
85 | daniel-mar | 103 | if (!isset($_COOKIE[session_name()])) return null; // GDPR: Only start a session when we really need one |
86 | daniel-mar | 104 | $this->sessionSafeStart(); |
557 | daniel-mar | 105 | OIDplus::cookieUtils()->setcookie(session_name(),session_id(),time()+$this->sessionLifetime); |
85 | daniel-mar | 106 | |
2 | daniel-mar | 107 | if (!isset($_SESSION[$name])) return null; |
108 | return self::decrypt($_SESSION[$name], $this->secret); |
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109 | } |
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110 | |||
85 | daniel-mar | 111 | public function destroySession() { |
112 | if (!isset($_COOKIE[session_name()])) return; |
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113 | |||
86 | daniel-mar | 114 | $this->sessionSafeStart(); |
557 | daniel-mar | 115 | OIDplus::cookieUtils()->setcookie(session_name(),session_id(),time()+$this->sessionLifetime); |
85 | daniel-mar | 116 | |
117 | $_SESSION = array(); |
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118 | session_destroy(); |
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119 | session_write_close(); |
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557 | daniel-mar | 120 | OIDplus::cookieUtils()->unsetcookie(session_name()); // remove cookie, so GDPR people are happy |
85 | daniel-mar | 121 | } |
122 | |||
83 | daniel-mar | 123 | public function exists($name) { |
124 | return isset($_SESSION[$name]); |
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125 | } |
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126 | |||
2 | daniel-mar | 127 | protected static function encrypt($data, $key) { |
465 | daniel-mar | 128 | if (function_exists('openssl_encrypt')) { |
129 | $iv = random_bytes(16); // AES block size in CBC mode |
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130 | // Encryption |
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131 | $ciphertext = openssl_encrypt( |
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132 | $data, |
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133 | 'AES-256-CBC', |
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134 | mb_substr($key, 0, 32, '8bit'), |
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135 | OPENSSL_RAW_DATA, |
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136 | $iv |
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137 | ); |
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138 | // Authentication |
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139 | $hmac = hash_hmac( |
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140 | 'SHA256', |
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141 | $iv . $ciphertext, |
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142 | mb_substr($key, 32, null, '8bit'), |
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143 | true |
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144 | ); |
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145 | return $hmac . $iv . $ciphertext; |
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146 | } else { |
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147 | // When OpenSSL is not available, then we just do a HMAC |
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148 | $hmac = hash_hmac( |
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149 | 'SHA256', |
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150 | $data, |
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151 | mb_substr($key, 32, null, '8bit'), |
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152 | true |
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153 | ); |
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154 | return $hmac . $data; |
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155 | } |
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6 | daniel-mar | 156 | } |
2 | daniel-mar | 157 | |
6 | daniel-mar | 158 | protected static function decrypt($data, $key) { |
465 | daniel-mar | 159 | if (function_exists('openssl_decrypt')) { |
160 | $hmac = mb_substr($data, 0, 32, '8bit'); |
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161 | $iv = mb_substr($data, 32, 16, '8bit'); |
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162 | $ciphertext = mb_substr($data, 48, null, '8bit'); |
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163 | // Authentication |
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164 | $hmacNew = hash_hmac( |
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165 | 'SHA256', |
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166 | $iv . $ciphertext, |
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167 | mb_substr($key, 32, null, '8bit'), |
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168 | true |
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169 | ); |
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170 | if (!hash_equals($hmac, $hmacNew)) { |
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171 | throw new OIDplusException(_L('Authentication failed')); |
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172 | } |
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173 | // Decryption |
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174 | return openssl_decrypt( |
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175 | $ciphertext, |
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176 | 'AES-256-CBC', |
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177 | mb_substr($key, 0, 32, '8bit'), |
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178 | OPENSSL_RAW_DATA, |
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179 | $iv |
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180 | ); |
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181 | } else { |
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182 | // When OpenSSL is not available, then we just do a HMAC |
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183 | $hmac = mb_substr($data, 0, 32, '8bit'); |
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184 | $cleartext = mb_substr($data, 32, null, '8bit'); |
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185 | $hmacNew = hash_hmac( |
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186 | 'SHA256', |
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187 | $cleartext, |
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188 | mb_substr($key, 32, null, '8bit'), |
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189 | true |
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190 | ); |
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191 | if (!hash_equals($hmac, $hmacNew)) { |
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192 | throw new OIDplusException(_L('Authentication failed')); |
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193 | } |
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194 | return $cleartext; |
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6 | daniel-mar | 195 | } |
196 | } |
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424 | daniel-mar | 197 | } |