chamilo /
chamilo-lms
| Total Complexity | 78 |
| Total Lines | 563 |
| Duplicated Lines | 0 % |
| Changes | 2 | ||
| Bugs | 1 | Features | 0 |
Complex classes like Security often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Security, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 40 | class Security |
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| 41 | { |
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| 42 | public static $clean = []; |
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| 43 | |||
| 44 | /** |
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| 45 | * Checks if the absolute path (directory) given is really under the |
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| 46 | * checker path (directory). |
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| 47 | * |
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| 48 | * @param string Absolute path to be checked (with trailing slash) |
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| 49 | * @param string Checker path under which the path |
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| 50 | * should be (absolute path, with trailing slash, get it from api_get_path(SYS_COURSE_PATH)) |
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| 51 | * |
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| 52 | * @return bool True if the path is under the checker, false otherwise |
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| 53 | */ |
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| 54 | public static function check_abs_path($abs_path, $checker_path) |
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| 55 | { |
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| 56 | // The checker path must be set. |
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| 57 | if (empty($checker_path)) { |
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| 58 | return false; |
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| 59 | } |
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| 60 | |||
| 61 | // Clean $abs_path. |
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| 62 | $abs_path = str_replace(['//', '../'], ['/', ''], $abs_path); |
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| 63 | $true_path = str_replace("\\", '/', realpath($abs_path)); |
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| 64 | $checker_path = str_replace("\\", '/', realpath($checker_path)); |
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| 65 | |||
| 66 | if (empty($checker_path)) { |
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| 67 | return false; |
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| 68 | } |
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| 69 | |||
| 70 | $found = strpos($true_path.'/', $checker_path); |
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| 71 | |||
| 72 | if ($found === 0) { |
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| 73 | return true; |
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| 74 | } else { |
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| 75 | // Code specific to Windows and case-insensitive behaviour |
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| 76 | if (api_is_windows_os()) { |
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| 77 | $found = stripos($true_path.'/', $checker_path); |
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| 78 | if ($found === 0) { |
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| 79 | return true; |
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| 80 | } |
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| 81 | } |
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| 82 | } |
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| 83 | |||
| 84 | return false; |
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| 85 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * Checks if the relative path (directory) given is really under the |
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| 89 | * checker path (directory). |
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| 90 | * |
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| 91 | * @param string Relative path to be checked (relative to the current directory) (with trailing slash) |
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| 92 | * @param string Checker path under which the path |
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| 93 | * should be (absolute path, with trailing slash, get it from api_get_path(SYS_COURSE_PATH)) |
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| 94 | * |
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| 95 | * @return bool True if the path is under the checker, false otherwise |
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| 96 | */ |
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| 97 | public static function check_rel_path($rel_path, $checker_path) |
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| 115 | } |
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| 116 | |||
| 117 | /** |
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| 118 | * Filters dangerous filenames (*.php[.]?* and .htaccess) and returns it in |
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| 119 | * a non-executable form (for PHP and htaccess, this is still vulnerable to |
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| 120 | * other languages' files extensions). |
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| 121 | * |
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| 122 | * @param string $filename Unfiltered filename |
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| 123 | * |
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| 124 | * @return string |
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| 125 | */ |
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| 126 | public static function filter_filename($filename) |
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| 129 | } |
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| 130 | |||
| 131 | /** |
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| 132 | * @return string |
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| 133 | */ |
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| 134 | public static function getTokenFromSession(string $prefix = '') |
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| 139 | } |
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| 140 | |||
| 141 | /** |
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| 142 | * This function checks that the token generated in get_token() has been kept (prevents |
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| 143 | * Cross-Site Request Forgeries attacks). |
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| 144 | * |
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| 145 | * @param string The array in which to get the token ('get' or 'post') |
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| 146 | * |
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| 147 | * @return bool True if it's the right token, false otherwise |
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| 148 | */ |
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| 149 | public static function check_token($request_type = 'post', FormValidator $form = null, string $prefix = '') |
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| 150 | { |
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| 151 | $secTokenVariable = self::generateSecTokenVariable($prefix); |
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| 152 | $sessionToken = Session::read($secTokenVariable); |
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| 153 | switch ($request_type) { |
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| 154 | case 'request': |
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| 155 | if (!empty($sessionToken) && isset($_REQUEST[$secTokenVariable]) && $sessionToken === $_REQUEST[$secTokenVariable]) { |
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| 156 | return true; |
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| 157 | } |
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| 158 | |||
| 159 | return false; |
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| 160 | case 'get': |
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| 161 | if (!empty($sessionToken) && isset($_GET[$secTokenVariable]) && $sessionToken === $_GET[$secTokenVariable]) { |
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| 162 | return true; |
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| 163 | } |
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| 164 | |||
| 165 | return false; |
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| 166 | case 'post': |
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| 167 | if (!empty($sessionToken) && isset($_POST[$secTokenVariable]) && $sessionToken === $_POST[$secTokenVariable]) { |
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| 168 | return true; |
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| 169 | } |
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| 170 | |||
| 171 | return false; |
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| 172 | case 'form': |
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| 173 | $token = $form->getSubmitValue('protect_token'); |
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| 174 | |||
| 175 | if (!empty($sessionToken) && !empty($token) && $sessionToken === $token) { |
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| 176 | return true; |
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| 177 | } |
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| 178 | |||
| 179 | return false; |
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| 180 | default: |
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| 181 | if (!empty($sessionToken) && isset($request_type) && $sessionToken === $request_type) { |
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| 182 | return true; |
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| 183 | } |
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| 184 | |||
| 185 | return false; |
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| 186 | } |
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| 187 | |||
| 188 | return false; // Just in case, don't let anything slip. |
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| 189 | } |
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| 190 | |||
| 191 | /** |
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| 192 | * Checks the user agent of the client as recorder by get_ua() to prevent |
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| 193 | * most session hijacking attacks. |
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| 194 | * |
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| 195 | * @return bool True if the user agent is the same, false otherwise |
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| 196 | */ |
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| 197 | public static function check_ua() |
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| 198 | { |
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| 199 | $security = Session::read('sec_ua'); |
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| 200 | $securitySeed = Session::read('sec_ua_seed'); |
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| 201 | |||
| 202 | if ($security === $_SERVER['HTTP_USER_AGENT'].$securitySeed) { |
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| 203 | return true; |
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| 204 | } |
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| 205 | |||
| 206 | return false; |
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| 207 | } |
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| 208 | |||
| 209 | /** |
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| 210 | * Clear the security token from the session. |
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| 211 | */ |
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| 212 | public static function clear_token(string $prefix = '') |
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| 213 | { |
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| 214 | $secTokenVariable = self::generateSecTokenVariable($prefix); |
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| 215 | |||
| 216 | Session::erase($secTokenVariable); |
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| 217 | } |
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| 218 | |||
| 219 | /** |
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| 220 | * This function sets a random token to be included in a form as a hidden field |
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| 221 | * and saves it into the user's session. Returns an HTML form element |
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| 222 | * This later prevents Cross-Site Request Forgeries by checking that the user is really |
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| 223 | * the one that sent this form in knowingly (this form hasn't been generated from |
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| 224 | * another website visited by the user at the same time). |
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| 225 | * Check the token with check_token(). |
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| 226 | * |
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| 227 | * @return string Hidden-type input ready to insert into a form |
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| 228 | */ |
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| 229 | public static function get_HTML_token(string $prefix = '') |
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| 230 | { |
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| 231 | $secTokenVariable = self::generateSecTokenVariable($prefix); |
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| 232 | $token = md5(uniqid(rand(), true)); |
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| 233 | $string = '<input type="hidden" name="'.$secTokenVariable.'" value="'.$token.'" />'; |
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| 234 | Session::write($secTokenVariable, $token); |
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| 235 | |||
| 236 | return $string; |
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| 237 | } |
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| 238 | |||
| 239 | /** |
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| 240 | * This function sets a random token to be included in a form as a hidden field |
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| 241 | * and saves it into the user's session. |
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| 242 | * This later prevents Cross-Site Request Forgeries by checking that the user is really |
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| 243 | * the one that sent this form in knowingly (this form hasn't been generated from |
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| 244 | * another website visited by the user at the same time). |
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| 245 | * Check the token with check_token(). |
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| 246 | * |
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| 247 | * @return string Token |
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| 248 | */ |
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| 249 | public static function get_token($prefix = '') |
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| 250 | { |
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| 251 | $secTokenVariable = self::generateSecTokenVariable($prefix); |
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| 252 | $token = md5(uniqid(rand(), true)); |
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| 253 | Session::write($secTokenVariable, $token); |
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| 254 | |||
| 255 | return $token; |
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| 256 | } |
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| 257 | |||
| 258 | /** |
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| 259 | * @return string |
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| 260 | */ |
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| 261 | public static function get_existing_token(string $prefix = '') |
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| 262 | { |
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| 263 | $secTokenVariable = self::generateSecTokenVariable($prefix); |
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| 264 | $token = Session::read($secTokenVariable); |
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| 265 | if (!empty($token)) { |
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| 266 | return $token; |
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| 267 | } else { |
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| 268 | return self::get_token($prefix); |
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| 269 | } |
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| 270 | } |
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| 271 | |||
| 272 | /** |
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| 273 | * Gets the user agent in the session to later check it with check_ua() to prevent |
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| 274 | * most cases of session hijacking. |
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| 275 | */ |
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| 276 | public static function get_ua() |
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| 281 | } |
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| 282 | |||
| 283 | /** |
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| 284 | * This function returns a variable from the clean array. If the variable doesn't exist, |
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| 285 | * it returns null. |
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| 286 | * |
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| 287 | * @param string Variable name |
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| 288 | * |
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| 289 | * @return mixed Variable or NULL on error |
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| 290 | */ |
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| 291 | public static function get($varname) |
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| 292 | { |
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| 293 | if (isset(self::$clean[$varname])) { |
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| 294 | return self::$clean[$varname]; |
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| 295 | } |
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| 296 | |||
| 297 | return null; |
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| 298 | } |
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| 299 | |||
| 300 | /** |
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| 301 | * This function tackles the XSS injections. |
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| 302 | * Filtering for XSS is very easily done by using the htmlentities() function. |
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| 303 | * This kind of filtering prevents JavaScript snippets to be understood as such. |
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| 304 | * |
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| 305 | * @param string The variable to filter for XSS, this params can be a string or an array (example : array(x,y)) |
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| 306 | * @param int The user status,constant allowed (STUDENT, COURSEMANAGER, ANONYMOUS, COURSEMANAGERLOWSECURITY) |
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| 307 | * @param bool $filter_terms |
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| 308 | * |
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| 309 | * @return mixed Filtered string or array |
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| 310 | */ |
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| 311 | public static function remove_XSS($var, $user_status = null, $filter_terms = false) |
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| 312 | { |
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| 313 | if ($filter_terms) { |
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| 314 | $var = self::filter_terms($var); |
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| 315 | } |
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| 316 | |||
| 317 | if (empty($user_status)) { |
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| 318 | if (api_is_anonymous()) { |
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| 319 | $user_status = ANONYMOUS; |
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| 320 | } else { |
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| 321 | if (api_is_allowed_to_edit()) { |
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| 322 | $user_status = COURSEMANAGER; |
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| 323 | } else { |
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| 324 | $user_status = STUDENT; |
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| 325 | } |
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| 326 | } |
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| 327 | } |
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| 328 | |||
| 329 | if ($user_status == COURSEMANAGERLOWSECURITY) { |
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| 330 | return $var; // No filtering. |
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| 331 | } |
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| 332 | |||
| 333 | static $purifier = []; |
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| 334 | if (!isset($purifier[$user_status])) { |
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| 335 | $cache_dir = api_get_path(SYS_ARCHIVE_PATH).'Serializer'; |
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| 336 | if (!file_exists($cache_dir)) { |
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| 337 | $mode = api_get_permissions_for_new_directories(); |
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| 338 | mkdir($cache_dir, $mode); |
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| 339 | } |
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| 340 | $config = HTMLPurifier_Config::createDefault(); |
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| 341 | $config->set('Cache.SerializerPath', $cache_dir); |
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| 342 | $config->set('Core.Encoding', api_get_system_encoding()); |
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| 343 | $config->set('HTML.Doctype', 'XHTML 1.0 Transitional'); |
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| 344 | $config->set('HTML.MaxImgLength', '2560'); |
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| 345 | $config->set('HTML.TidyLevel', 'light'); |
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| 346 | $config->set('Core.ConvertDocumentToFragment', false); |
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| 347 | $config->set('Core.RemoveProcessingInstructions', true); |
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| 348 | |||
| 349 | if (api_get_setting('enable_iframe_inclusion') == 'true') { |
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| 350 | $config->set('Filter.Custom', [new AllowIframes()]); |
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| 351 | } |
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| 352 | |||
| 353 | // Shows _target attribute in anchors |
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| 354 | $config->set('Attr.AllowedFrameTargets', ['_blank', '_top', '_self', '_parent']); |
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| 355 | |||
| 356 | if ($user_status == STUDENT) { |
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| 357 | global $allowed_html_student; |
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| 358 | $config->set('HTML.SafeEmbed', true); |
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| 359 | $config->set('HTML.SafeObject', true); |
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| 360 | $config->set('Filter.YouTube', true); |
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| 361 | $config->set('HTML.FlashAllowFullScreen', true); |
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| 362 | $config->set('HTML.Allowed', $allowed_html_student); |
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| 363 | } elseif ($user_status == COURSEMANAGER) { |
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| 364 | global $allowed_html_teacher; |
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| 365 | $config->set('HTML.SafeEmbed', true); |
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| 366 | $config->set('HTML.SafeObject', true); |
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| 367 | $config->set('Filter.YouTube', true); |
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| 368 | $config->set('HTML.FlashAllowFullScreen', true); |
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| 369 | $config->set('HTML.Allowed', $allowed_html_teacher); |
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| 370 | } else { |
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| 371 | global $allowed_html_anonymous; |
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| 372 | $config->set('HTML.Allowed', $allowed_html_anonymous); |
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| 373 | } |
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| 374 | |||
| 375 | // We need it for example for the flv player (ids of surrounding div-tags have to be preserved). |
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| 376 | $config->set('Attr.EnableID', true); |
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| 377 | $config->set('CSS.AllowImportant', true); |
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| 378 | // We need for the flv player the css definition display: none; |
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| 379 | $config->set('CSS.AllowTricky', true); |
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| 380 | $config->set('CSS.Proprietary', true); |
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| 381 | |||
| 382 | // Allow uri scheme. |
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| 383 | $config->set('URI.AllowedSchemes', [ |
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| 384 | 'http' => true, |
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| 385 | 'https' => true, |
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| 386 | 'mailto' => true, |
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| 387 | 'ftp' => true, |
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| 388 | 'nntp' => true, |
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| 389 | 'news' => true, |
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| 390 | 'data' => true, |
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| 391 | ]); |
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| 392 | |||
| 393 | // Allow <video> tag |
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| 394 | //$config->set('HTML.Doctype', 'HTML 4.01 Transitional'); |
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| 395 | $config->set('HTML.SafeIframe', true); |
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| 396 | |||
| 397 | // Set some HTML5 properties |
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| 398 | $config->set('HTML.DefinitionID', 'html5-definitions'); // unqiue id |
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| 399 | $config->set('HTML.DefinitionRev', 1); |
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| 400 | if ($def = $config->maybeGetRawHTMLDefinition()) { |
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| 401 | // https://html.spec.whatwg.org/dev/media.html#the-video-element |
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| 402 | $def->addElement( |
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| 403 | 'video', |
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| 404 | 'Block', |
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| 405 | 'Optional: (source, Flow) | (Flow, source) | Flow', |
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| 406 | 'Common', |
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| 407 | [ |
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| 408 | 'src' => 'URI', |
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| 409 | 'type' => 'Text', |
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| 410 | 'width' => 'Length', |
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| 411 | 'height' => 'Length', |
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| 412 | 'poster' => 'URI', |
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| 413 | 'preload' => 'Enum#auto,metadata,none', |
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| 414 | 'controls' => 'Bool', |
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| 415 | ] |
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| 416 | ); |
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| 417 | // https://html.spec.whatwg.org/dev/media.html#the-audio-element |
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| 418 | $def->addElement( |
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| 419 | 'audio', |
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| 420 | 'Block', |
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| 421 | 'Optional: (source, Flow) | (Flow, source) | Flow', |
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| 422 | 'Common', |
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| 423 | [ |
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| 424 | 'autoplay' => 'Bool', |
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| 425 | 'src' => 'URI', |
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| 426 | 'loop' => 'Bool', |
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| 427 | 'preload' => 'Enum#auto,metadata,none', |
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| 428 | 'controls' => 'Bool', |
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| 429 | 'muted' => 'Bool', |
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| 430 | ] |
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| 431 | ); |
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| 432 | $def->addElement( |
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| 433 | 'source', |
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| 434 | 'Block', |
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| 435 | 'Flow', |
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| 436 | 'Common', |
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| 437 | ['src' => 'URI', 'type' => 'Text'] |
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| 438 | ); |
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| 439 | } |
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| 440 | |||
| 441 | $purifier[$user_status] = new HTMLPurifier($config); |
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| 442 | } |
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| 443 | |||
| 444 | if (is_array($var)) { |
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| 445 | return $purifier[$user_status]->purifyArray($var); |
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| 446 | } else { |
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| 447 | return $purifier[$user_status]->purify($var); |
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| 448 | } |
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| 449 | } |
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| 450 | |||
| 451 | /** |
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| 452 | * Filter content. |
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| 453 | * |
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| 454 | * @param string $text to be filter |
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| 455 | * |
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| 456 | * @return string |
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| 457 | */ |
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| 458 | public static function filter_terms($text) |
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| 459 | { |
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| 460 | static $bad_terms = []; |
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| 461 | |||
| 462 | if (empty($bad_terms)) { |
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| 463 | $list = api_get_setting('filter_terms'); |
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| 464 | if (!empty($list)) { |
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| 465 | $list = explode("\n", $list); |
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| 466 | $list = array_filter($list); |
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| 467 | if (!empty($list)) { |
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| 468 | foreach ($list as $term) { |
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| 469 | $term = str_replace(["\r\n", "\r", "\n", "\t"], '', $term); |
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| 470 | $html_entities_value = api_htmlentities($term, ENT_QUOTES, api_get_system_encoding()); |
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| 471 | $bad_terms[] = $term; |
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| 472 | if ($term != $html_entities_value) { |
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| 473 | $bad_terms[] = $html_entities_value; |
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| 474 | } |
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| 475 | } |
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| 476 | } |
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| 477 | $bad_terms = array_filter($bad_terms); |
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| 478 | } |
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| 479 | } |
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| 480 | |||
| 481 | $replace = '***'; |
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| 482 | if (!empty($bad_terms)) { |
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| 483 | // Fast way |
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| 484 | $new_text = str_ireplace($bad_terms, $replace, $text, $count); |
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| 485 | $text = $new_text; |
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| 486 | } |
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| 487 | |||
| 488 | return $text; |
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| 489 | } |
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| 490 | |||
| 491 | /** |
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| 492 | * This method provides specific protection (against XSS and other kinds of attacks) |
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| 493 | * for static images (icons) used by the system. |
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| 494 | * Image paths are supposed to be given by programmers - people who know what they do, anyway, |
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| 495 | * this method encourages a safe practice for generating icon paths, without using heavy solutions |
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| 496 | * based on HTMLPurifier for example. |
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| 497 | * |
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| 498 | * @param string $image_path the input path of the image, it could be relative or absolute URL |
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| 499 | * |
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| 500 | * @return string returns sanitized image path or an empty string when the image path is not secure |
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| 501 | * |
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| 502 | * @author Ivan Tcholakov, March 2011 |
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| 503 | */ |
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| 504 | public static function filter_img_path($image_path) |
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| 505 | { |
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| 506 | static $allowed_extensions = ['png', 'gif', 'jpg', 'jpeg', 'svg', 'webp']; |
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| 507 | $image_path = htmlspecialchars(trim($image_path)); // No html code is allowed. |
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| 508 | // We allow static images only, query strings are forbidden. |
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| 509 | if (strpos($image_path, '?') !== false) { |
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| 510 | return ''; |
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| 511 | } |
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| 512 | if (($pos = strpos($image_path, ':')) !== false) { |
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| 513 | // Protocol has been specified, let's check it. |
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| 514 | if (stripos($image_path, 'javascript:') !== false) { |
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| 515 | // Javascript everywhere in the path is not allowed. |
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| 516 | return ''; |
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| 517 | } |
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| 518 | // We allow only http: and https: protocols for now. |
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| 519 | //if (!preg_match('/^https?:\/\//i', $image_path)) { |
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| 520 | // return ''; |
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| 521 | //} |
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| 522 | if (stripos($image_path, 'http://') !== 0 && stripos($image_path, 'https://') !== 0) { |
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| 523 | return ''; |
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| 524 | } |
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| 525 | } |
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| 526 | // We allow file extensions for images only. |
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| 527 | //if (!preg_match('/.+\.(png|gif|jpg|jpeg)$/i', $image_path)) { |
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| 528 | // return ''; |
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| 529 | //} |
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| 530 | if (($pos = strrpos($image_path, '.')) !== false) { |
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| 531 | if (!in_array(strtolower(substr($image_path, $pos + 1)), $allowed_extensions)) { |
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| 532 | return ''; |
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| 533 | } |
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| 534 | } else { |
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| 535 | return ''; |
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| 536 | } |
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| 537 | |||
| 538 | return $image_path; |
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| 539 | } |
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| 540 | |||
| 541 | /** |
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| 542 | * Get password requirements |
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| 543 | * It checks config value 'password_requirements' or uses the "classic" |
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| 544 | * Chamilo password requirements. |
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| 545 | * |
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| 546 | * @return array |
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| 547 | */ |
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| 548 | public static function getPasswordRequirements() |
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| 549 | { |
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| 550 | // Default |
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| 551 | $requirements = [ |
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| 552 | 'min' => [ |
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| 553 | 'lowercase' => 0, |
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| 554 | 'uppercase' => 0, |
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| 555 | 'numeric' => 2, |
||
| 556 | 'length' => 5, |
||
| 557 | ], |
||
| 558 | ]; |
||
| 559 | |||
| 560 | $passwordRequirements = api_get_configuration_value('password_requirements'); |
||
| 561 | if (!empty($passwordRequirements)) { |
||
| 562 | $requirements = $passwordRequirements; |
||
| 563 | } |
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| 564 | |||
| 565 | return $requirements; |
||
| 566 | } |
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| 567 | |||
| 568 | /** |
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| 569 | * Gets password requirements in the platform language using get_lang |
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| 570 | * based in platform settings. See function 'self::getPasswordRequirements'. |
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| 571 | * |
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| 572 | * @return string |
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| 573 | */ |
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| 574 | public static function getPasswordRequirementsToString($passedConditions = []) |
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| 575 | { |
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| 576 | $output = ''; |
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| 577 | $setting = self::getPasswordRequirements(); |
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| 578 | foreach ($setting as $type => $rules) { |
||
| 579 | foreach ($rules as $rule => $parameter) { |
||
| 580 | if (empty($parameter)) { |
||
| 581 | continue; |
||
| 582 | } |
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| 583 | $output .= sprintf( |
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| 584 | get_lang( |
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| 585 | 'NewPasswordRequirement'.ucfirst($type).'X'.ucfirst($rule) |
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| 586 | ), |
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| 587 | $parameter |
||
| 588 | ); |
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| 589 | $output .= '<br />'; |
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| 590 | } |
||
| 591 | } |
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| 592 | |||
| 593 | return $output; |
||
| 594 | } |
||
| 595 | |||
| 596 | private static function generateSecTokenVariable(string $prefix = ''): string |
||
| 603 | } |
||
| 604 | } |
||
| 605 |
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This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces.
This is most likely a typographical error or the method has been renamed.