| 1 |
<?php |
| 2 |
|
| 3 |
// Do not allow the file to be called directly. |
| 4 |
if ( ! defined( 'ABSPATH' ) ) { |
| 5 |
exit; |
| 6 |
} |
| 7 |
|
| 8 |
/** |
| 9 |
* This class provides the firewall functionality. |
| 10 |
*/ |
| 11 |
class P_Firewall extends P_Core { |
| 12 |
|
| 13 |
/** |
| 14 |
* Parse the firewall and whitelist rules and determine if it's valid. |
| 15 |
* Then set the types with all server/client variables and launch the processor. |
| 16 |
* |
| 17 |
* @param bool $from_main Whether or not the firewall is loaded from the main script or not. |
| 18 |
* @param Patchstack $core |
| 19 |
* @param bool $skip Whether or not to process and execute the rules. |
| 20 |
* @return void |
| 21 |
*/ |
| 22 |
public function __construct( $from_main = false, $core = null, $skip = false ) { |
| 23 |
if ( ! $from_main || ! $core ) { |
| 24 |
if ( $core ) { |
| 25 |
parent::__construct( $core ); |
| 26 |
} |
| 27 |
return; |
| 28 |
} |
| 29 |
|
| 30 |
parent::__construct( $core ); |
| 31 |
|
| 32 |
// If we only want to initialize the firewall but not execute the rules. |
| 33 |
if ( $skip ) { |
| 34 |
return; |
| 35 |
} |
| 36 |
|
| 37 |
// Process the firewall rules. |
| 38 |
$this->processor(); |
| 39 |
} |
| 40 |
|
| 41 |
/** |
| 42 |
* Check the custom whitelist rules defined in the backend of WordPress |
| 43 |
* and attempt to match it with the request. |
| 44 |
* |
| 45 |
* @return boolean |
| 46 |
*/ |
| 47 |
private function is_custom_whitelisted() { |
| 48 |
$whitelist = str_replace( '<?php exit; ?>', '', get_option( 'patchstack_custom_whitelist_rules', '' ) ); |
| 49 |
if ( empty( $whitelist ) ) { |
| 50 |
return false; |
| 51 |
} |
| 52 |
|
| 53 |
// Loop through all lines. |
| 54 |
$lines = explode( "\n", $whitelist ); |
| 55 |
$ip = $this->get_ip(); |
| 56 |
|
| 57 |
foreach ( $lines as $line ) { |
| 58 |
$t = explode( ':', $line ); |
| 59 |
|
| 60 |
if ( count( $t ) == 2 ) { |
| 61 |
$val = strtolower( trim( $t[1] ) ); |
| 62 |
switch ( strtolower( $t[0] ) ) { |
| 63 |
// IP address match. |
| 64 |
case 'ip': |
| 65 |
if ( $ip == $val ) { |
| 66 |
return true; |
| 67 |
} |
| 68 |
break; |
| 69 |
// Payload match. |
| 70 |
case 'payload': |
| 71 |
if ( count( $_POST ) > 0 && strpos( strtolower( print_r( $_POST, true ) ), $val ) !== false ) { |
| 72 |
return true; |
| 73 |
} |
| 74 |
|
| 75 |
if ( count( $_GET ) > 0 && strpos( strtolower( print_r( $_GET, true ) ), $val ) !== false ) { |
| 76 |
return true; |
| 77 |
} |
| 78 |
break; |
| 79 |
// URL match. |
| 80 |
case 'url': |
| 81 |
if ( strpos( strtolower( $_SERVER['REQUEST_URI'] ), $val ) !== false ) { |
| 82 |
return true; |
| 83 |
} |
| 84 |
break; |
| 85 |
} |
| 86 |
} |
| 87 |
} |
| 88 |
|
| 89 |
return false; |
| 90 |
} |
| 91 |
|
| 92 |
/** |
| 93 |
* Determine if the request should be whitelisted. |
| 94 |
* |
| 95 |
* @return boolean |
| 96 |
*/ |
| 97 |
private function is_whitelisted() { |
| 98 |
// First check if the user has custom whitelist rules configured. |
| 99 |
if ( $this->is_custom_whitelisted() ) { |
| 100 |
return true; |
| 101 |
} |
| 102 |
|
| 103 |
// Load the whitelist. |
| 104 |
$whitelists = get_option( 'patchstack_whitelist_rules', '' ); |
| 105 |
if ( $whitelists == null || $whitelists == '' ) { |
| 106 |
return false; |
| 107 |
} |
| 108 |
|
| 109 |
// Parse the whitelist. |
| 110 |
$whitelists = json_decode( str_replace( '<?php exit; ?>', '', $whitelists ), true ); |
| 111 |
|
| 112 |
// Grab visitor's IP address and request data. |
| 113 |
$client_ip = $this->get_ip(); |
| 114 |
$requests = $this->capture_request(); |
| 115 |
|
| 116 |
foreach ( $whitelists as $whitelist ) { |
| 117 |
$whitelist_rule = json_decode( $whitelist['rule'] ); |
| 118 |
$matched_rules = 0; |
| 119 |
|
| 120 |
// If matches on all request methods, only 1 rule match is required to whitelist. |
| 121 |
if ( $whitelist_rule->method === 'ALL' ) { |
| 122 |
$count_rules = 1; |
| 123 |
} else { |
| 124 |
if ( ! is_null( $whitelist_rule ) ) { |
| 125 |
$count_rules = $whitelist_rule->rules; |
| 126 |
$count_rules = $this->count_rules( $count_rules ); |
| 127 |
} |
| 128 |
} |
| 129 |
|
| 130 |
// If an IP address match is given, determine if it matches. |
| 131 |
$ip = isset( $whitelist_rule->rules, $whitelist_rule->rules->ip_address ) ? $whitelist_rule->rules->ip_address : null; |
| 132 |
if ( ! is_null( $ip ) ) { |
| 133 |
if ( strpos( $ip, '*' ) !== false ) { |
| 134 |
$whitelisted_ip = $this->plugin->ban->check_wildcard_rule( $client_ip, $ip ); |
| 135 |
} elseif ( strpos( $ip, '-' ) !== false ) { |
| 136 |
$whitelisted_ip = $this->plugin->ban->check_range_rule( $client_ip, $ip ); |
| 137 |
} elseif ( strpos( $ip, '/' ) !== false ) { |
| 138 |
$whitelisted_ip = $this->plugin->ban->check_subnet_mask_rule( $client_ip, $ip ); |
| 139 |
} elseif ( $client_ip == $ip ) { |
| 140 |
$whitelisted_ip = true; |
| 141 |
} else { |
| 142 |
$whitelisted_ip = false; |
| 143 |
} |
| 144 |
} else { |
| 145 |
$whitelisted_ip = true; |
| 146 |
} |
| 147 |
|
| 148 |
foreach ( $requests as $key => $request ) { |
| 149 |
|
| 150 |
// Treat the raw POST data string as the body contents of all values combined. |
| 151 |
if ( $key == 'rulesRawPost' ) { |
| 152 |
$key = 'rulesBodyAll'; |
| 153 |
} |
| 154 |
|
| 155 |
if ( $whitelist_rule->method == $requests['method'] || $whitelist_rule->method == 'ALL' ) { |
| 156 |
$test = strtolower( preg_replace( '/(?!^)[A-Z]{2,}(?=[A-Z][a-z])|[A-Z][a-z]/', '->$0', $key ) ); |
| 157 |
$rule = array_reduce( |
| 158 |
explode( '->', $test ), |
| 159 |
function ( $o, $p ) { |
| 160 |
if ( ! isset( $o->$p ) ) { |
| 161 |
return null; |
| 162 |
} |
| 163 |
|
| 164 |
return $o->$p; |
| 165 |
}, |
| 166 |
$whitelist_rule |
| 167 |
); |
| 168 |
|
| 169 |
if ( ! is_null( $rule ) && substr( $key, 0, 4 ) == 'rule' && $this->is_rule_match( $rule, $request ) ) { |
| 170 |
$matched_rules++; |
| 171 |
} |
| 172 |
} |
| 173 |
} |
| 174 |
|
| 175 |
if ( $matched_rules >= $count_rules && $whitelisted_ip ) { |
| 176 |
return true; |
| 177 |
} |
| 178 |
} |
| 179 |
|
| 180 |
return false; |
| 181 |
} |
| 182 |
|
| 183 |
/** |
| 184 |
* Retrieve all HTTP headers that start with HTTP_. |
| 185 |
* |
| 186 |
* @return array |
| 187 |
*/ |
| 188 |
private function get_headers() { |
| 189 |
$headers = array(); |
| 190 |
foreach ( $_SERVER as $name => $value ) { |
| 191 |
if ( substr( $name, 0, 5 ) == 'HTTP_' ) { |
| 192 |
$headers[ str_replace( ' ', '-', ucwords( strtolower( str_replace( '_', ' ', substr( $name, 5 ) ) ) ) ) ] = $value; |
| 193 |
} |
| 194 |
} |
| 195 |
|
| 196 |
return $headers; |
| 197 |
} |
| 198 |
|
| 199 |
/** |
| 200 |
* Retrieve information about any file uploads. |
| 201 |
* |
| 202 |
* @return array |
| 203 |
*/ |
| 204 |
private function get_file_upload_data() { |
| 205 |
if ( ! is_array( $_FILES ) || count( $_FILES ) == 0 ) { |
| 206 |
return ''; |
| 207 |
} |
| 208 |
|
| 209 |
// Extract the information we need from $_FILES. |
| 210 |
$return = array(); |
| 211 |
foreach ( $_FILES as $key => $data ) { |
| 212 |
foreach ( $data as $key2 => $data2 ) { |
| 213 |
|
| 214 |
// We only want the name and type. |
| 215 |
if ( ! in_array( $key2, array( 'name', 'type' ) ) ) { |
| 216 |
continue; |
| 217 |
} |
| 218 |
|
| 219 |
if ( ! is_array( $data2 ) ) { |
| 220 |
$return[] = $key2 . '=' . $data2; |
| 221 |
} else { |
| 222 |
$return[] = $key2 . '=' . @$this->multi_implode( $data2, '&' . $key2 . '=' ); |
| 223 |
} |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
return implode( '&', $return ); |
| 228 |
} |
| 229 |
|
| 230 |
|
| 231 |
/** |
| 232 |
* Returns all request methods and parameters |
| 233 |
* |
| 234 |
* @return string |
| 235 |
*/ |
| 236 |
private function capture_request() { |
| 237 |
$data = $this->capture_keys(); |
| 238 |
|
| 239 |
// Get the method and URL. |
| 240 |
$method = $_SERVER['REQUEST_METHOD']; |
| 241 |
$rulesUri = $_SERVER['REQUEST_URI']; |
| 242 |
|
| 243 |
// Store the header values in different formats. |
| 244 |
$rulesHeadersKeys = array(); |
| 245 |
$rulesHeadersValues = array(); |
| 246 |
$rulesHeadersCombinations = array(); |
| 247 |
|
| 248 |
// Retrieve the headers. |
| 249 |
$headers = $this->get_headers(); |
| 250 |
$rulesHeadersAll = implode( ' ', $headers ); |
| 251 |
foreach ( $headers as $name => $value ) { |
| 252 |
$rulesHeadersKeys[] = $name; |
| 253 |
$rulesHeadersValues[] = $value; |
| 254 |
$rulesHeadersCombinations[] = $name . ': ' . $value; |
| 255 |
} |
| 256 |
|
| 257 |
// Store the $_POST values in different formats. |
| 258 |
$rulesBodyKeys = array(); |
| 259 |
$rulesBodyValues = array(); |
| 260 |
$rulesBodyCombinations = array(); |
| 261 |
|
| 262 |
// Retrieve the $_POST values. |
| 263 |
$rulesBodyAll = urldecode( http_build_query( $data['POST'] ) ); |
| 264 |
foreach ( $data['POST'] as $key => $value ) { |
| 265 |
if ( is_array( $value ) ) { |
| 266 |
$value = @$this->multi_implode( $value, ' ' ); |
| 267 |
} |
| 268 |
$rulesBodyKeys[] = $key; |
| 269 |
$rulesBodyValues[] = $value; |
| 270 |
$rulesBodyCombinations[] = $key . '=' . $value; |
| 271 |
} |
| 272 |
|
| 273 |
// Store the $_GET values in different formats. |
| 274 |
$rulesParamsKeys = array(); |
| 275 |
$rulesParamsValues = array(); |
| 276 |
$rulesParamsCombinations = array(); |
| 277 |
|
| 278 |
// Retrieve the $_GET values. |
| 279 |
$rulesParamsAll = urldecode( http_build_query( $data['GET'] ) ); |
| 280 |
foreach ( $data['GET'] as $key => $value ) { |
| 281 |
if ( is_array( $value ) ) { |
| 282 |
$value = @$this->multi_implode( $value, ' ' ); |
| 283 |
} |
| 284 |
$rulesParamsKeys[] = $key; |
| 285 |
$rulesParamsValues[] = $value; |
| 286 |
$rulesParamsCombinations[] = $key . '=' . $value; |
| 287 |
} |
| 288 |
|
| 289 |
// Raw POST data. |
| 290 |
$rulesRawPost = @file_get_contents( 'php://input' ); |
| 291 |
|
| 292 |
// Data about file uploads. |
| 293 |
$rulesFile = $this->get_file_upload_data(); |
| 294 |
|
| 295 |
// Return each value as its own array. |
| 296 |
return compact( |
| 297 |
'method', |
| 298 |
'rulesFile', |
| 299 |
'rulesRawPost', |
| 300 |
'rulesUri', |
| 301 |
'rulesHeadersAll', |
| 302 |
'rulesHeadersKeys', |
| 303 |
'rulesHeadersValues', |
| 304 |
'rulesHeadersCombinations', |
| 305 |
'rulesBodyAll', |
| 306 |
'rulesBodyKeys', |
| 307 |
'rulesBodyValues', |
| 308 |
'rulesBodyCombinations', |
| 309 |
'rulesParamsAll', |
| 310 |
'rulesParamsKeys', |
| 311 |
'rulesParamsValues', |
| 312 |
'rulesParamsCombinations' |
| 313 |
); |
| 314 |
} |
| 315 |
|
| 316 |
/** |
| 317 |
* Capture the keys of the request. |
| 318 |
* |
| 319 |
* @return array |
| 320 |
*/ |
| 321 |
private function capture_keys() { |
| 322 |
// Data we want to go through. |
| 323 |
$data = array( |
| 324 |
'POST' => $_POST, |
| 325 |
'GET' => $_GET, |
| 326 |
); |
| 327 |
|
| 328 |
// Determine if there are any keys we should remove from the data set. |
| 329 |
if ( get_option( 'patchstack_whitelist_keys_rules', '' ) == '' ) { |
| 330 |
return $data; |
| 331 |
} |
| 332 |
|
| 333 |
// Must be valid JSON and decodes to at least 2 primary data arrays. |
| 334 |
$keys = json_decode( get_option( 'patchstack_whitelist_keys_rules' ), true ); |
| 335 |
if ( ! $keys || ! is_array( $keys ) || $keys && count( $keys ) < 2 ) { |
| 336 |
return $data; |
| 337 |
} |
| 338 |
|
| 339 |
// Remove the keys where necessary, go through all data types (GET, POST). |
| 340 |
foreach ( $keys as $type => $entries ) { |
| 341 |
|
| 342 |
// Go through all whitelisted actions. |
| 343 |
foreach ( $entries as $entry ) { |
| 344 |
$t = explode( '.', $entry ); |
| 345 |
|
| 346 |
// For non-multidimensional array checks. |
| 347 |
if ( count( $t ) == 1 ) { |
| 348 |
// If the value itself exists. |
| 349 |
if ( isset( $data[ $type ][ $t[0] ] ) ) { |
| 350 |
unset( $data[ $type ][ $t[0] ] ); |
| 351 |
} |
| 352 |
|
| 353 |
// For pattern checking. |
| 354 |
if ( strpos( $t[0], '*' ) !== false ) { |
| 355 |
$star = explode( '*', $t[0] ); |
| 356 |
|
| 357 |
// Loop through all $_POST, $_GET values. |
| 358 |
foreach ( $data as $method => $values ) { |
| 359 |
foreach ( $values as $key => $value ) { |
| 360 |
if ( ! is_array( $value ) && strpos( $key, $star[0] ) !== false ) { |
| 361 |
unset( $data[ $method ][ $key ] ); |
| 362 |
} |
| 363 |
} |
| 364 |
} |
| 365 |
} |
| 366 |
continue; |
| 367 |
} |
| 368 |
|
| 369 |
// For multidimensional array checks. |
| 370 |
$end =& $data[ $type ]; |
| 371 |
$skip = false; |
| 372 |
foreach ( $t as $var ) { |
| 373 |
if ( ! isset( $end[ $var ] ) ) { |
| 374 |
$skip = true; |
| 375 |
break; |
| 376 |
} |
| 377 |
$end =& $end[ $var ]; |
| 378 |
} |
| 379 |
|
| 380 |
// Since we cannot unset it due to it being a reference variable, |
| 381 |
// we just set it to an empty string instead. |
| 382 |
if ( ! $skip ) { |
| 383 |
$end = ''; |
| 384 |
} |
| 385 |
} |
| 386 |
} |
| 387 |
|
| 388 |
return $data; |
| 389 |
} |
| 390 |
|
| 391 |
/** |
| 392 |
* Implode array recursively. |
| 393 |
* |
| 394 |
* @param $array |
| 395 |
* @param $glue |
| 396 |
* @return bool|string |
| 397 |
*/ |
| 398 |
private function multi_implode( $array, $glue ) { |
| 399 |
$ret = ''; |
| 400 |
|
| 401 |
foreach ( $array as $item ) { |
| 402 |
if ( is_array( $item ) ) { |
| 403 |
$ret .= $this->multi_implode( $item, $glue ) . $glue; |
| 404 |
} else { |
| 405 |
$ret .= $item . $glue; |
| 406 |
} |
| 407 |
} |
| 408 |
|
| 409 |
return substr( $ret, 0, 0 - strlen( $glue ) ); |
| 410 |
} |
| 411 |
|
| 412 |
/** |
| 413 |
* Determine if the request matches the given firewall or whitelist rule. |
| 414 |
* |
| 415 |
* @param string $rule |
| 416 |
* @param string|array $request |
| 417 |
* @return bool |
| 418 |
*/ |
| 419 |
private function is_rule_match( $rule, $request ) { |
| 420 |
$is_matched = false; |
| 421 |
if ( is_array( $request ) ) { |
| 422 |
foreach ( $request as $key => $value ) { |
| 423 |
$is_matched = $this->is_rule_match( $rule, $value ); |
| 424 |
if ( $is_matched ) { |
| 425 |
return $is_matched; |
| 426 |
} |
| 427 |
} |
| 428 |
} else { |
| 429 |
return preg_match( $rule, urldecode( $request ) ); |
| 430 |
} |
| 431 |
|
| 432 |
return $is_matched; |
| 433 |
} |
| 434 |
|
| 435 |
/** |
| 436 |
* Count the number of rules. |
| 437 |
* |
| 438 |
* @param array $array |
| 439 |
* @return integer |
| 440 |
*/ |
| 441 |
private function count_rules( $array ) { |
| 442 |
$counter = 0; |
| 443 |
if ( is_object( $array ) ) { |
| 444 |
$array = (array) $array; |
| 445 |
} |
| 446 |
|
| 447 |
if ( $array['uri'] ) { |
| 448 |
$counter++; |
| 449 |
} |
| 450 |
|
| 451 |
foreach ( array( 'body', 'params', 'headers' ) as $type ) { |
| 452 |
foreach ( $array[ $type ] as $key => $value ) { |
| 453 |
if ( ! is_null( $value ) ) { |
| 454 |
$counter++; |
| 455 |
} |
| 456 |
} |
| 457 |
} |
| 458 |
|
| 459 |
return $counter; |
| 460 |
} |
| 461 |
|
| 462 |
/** |
| 463 |
* Runs the firewall rules processor. |
| 464 |
* |
| 465 |
* @return void |
| 466 |
*/ |
| 467 |
private function processor() { |
| 468 |
// Load the firewall rules. |
| 469 |
$rules = json_decode( get_option( 'patchstack_firewall_rules', '' ), true ); |
| 470 |
if ( $rules == '' || is_null( $rules ) ) { |
| 471 |
return; |
| 472 |
} |
| 473 |
|
| 474 |
// Determine if the user is temporarily blocked from the site. |
| 475 |
if ( $this->is_auto_ip_blocked() > $this->get_option( 'patchstack_autoblock_attempts', 10 ) && ! $this->is_authenticated() ) { |
| 476 |
$this->display_error_page( 22 ); |
| 477 |
} |
| 478 |
|
| 479 |
// Check for whitelist. |
| 480 |
$is_whitelisted = $this->is_whitelisted(); |
| 481 |
|
| 482 |
// Obtain the IP address and request data. |
| 483 |
$client_ip = $this->get_ip(); |
| 484 |
$requests = $this->capture_request(); |
| 485 |
|
| 486 |
// Iterate through all root objects. |
| 487 |
foreach ( $rules as $firewall_rule ) { |
| 488 |
$blocked_count = 0; |
| 489 |
$firewall_rule['bypass_whitelist'] = isset( $firewall_rule['bypass_whitelist'] ) ? $firewall_rule['bypass_whitelist'] : false; |
| 490 |
|
| 491 |
// Do we need to skip the whitelist for a particular rule? |
| 492 |
if ( isset( $firewall_rule['bypass_whitelist'] ) && ! $firewall_rule['bypass_whitelist'] && $is_whitelisted ) { |
| 493 |
continue; |
| 494 |
} |
| 495 |
|
| 496 |
$rule_terms = json_decode( $firewall_rule['rule'] ); |
| 497 |
|
| 498 |
// Determine if we should match the IP address. |
| 499 |
$ip = isset( $rule_terms->rules->ip_address ) ? $rule_terms->rules->ip_address : null; |
| 500 |
if ( ! is_null( $ip ) ) { |
| 501 |
$matched_ip = false; |
| 502 |
if ( strpos( $ip, '*' ) !== false ) { |
| 503 |
$matched_ip = $this->plugin->ban->check_wildcard_rule( $client_ip, $ip ); |
| 504 |
} elseif ( strpos( $ip, '-' ) !== false ) { |
| 505 |
$matched_ip = $this->plugin->ban->check_range_rule( $client_ip, $ip ); |
| 506 |
} elseif ( strpos( $ip, '/' ) !== false ) { |
| 507 |
$matched_ip = $this->plugin->ban->check_subnet_mask_rule( $client_ip, $ip ); |
| 508 |
} elseif ( $client_ip == $ip ) { |
| 509 |
$matched_ip = true; |
| 510 |
} |
| 511 |
|
| 512 |
if ( ! $matched_ip ) { |
| 513 |
continue; |
| 514 |
} |
| 515 |
} |
| 516 |
|
| 517 |
// If matches on all request methods, only 1 rule match is required to block |
| 518 |
if ( $rule_terms->method === 'ALL' ) { |
| 519 |
$count_rules = 1; |
| 520 |
} else { |
| 521 |
$count_rules = json_decode( json_encode( $rule_terms->rules ), true ); |
| 522 |
$count_rules = $this->count_rules( $count_rules ); |
| 523 |
} |
| 524 |
|
| 525 |
// Loop through all request data that we captured. |
| 526 |
foreach ( $requests as $key => $request ) { |
| 527 |
|
| 528 |
// Treat the raw POST data string as the body contents of all values combined. |
| 529 |
if ( $key == 'rulesRawPost' ) { |
| 530 |
$key = 'rulesBodyAll'; |
| 531 |
} |
| 532 |
|
| 533 |
// Determine if the requesting method matches. |
| 534 |
if ( $rule_terms->method == $requests['method'] || $rule_terms->method == 'ALL' || $rule_terms->method == 'GET' || ( $rule_terms->method == 'FILES' && $this->is_file_upload() ) ) { |
| 535 |
$test = strtolower( preg_replace( '/(?!^)[A-Z]{2,}(?=[A-Z][a-z])|[A-Z][a-z]/', '->$0', $key ) ); |
| 536 |
$exp = explode( '->', $test ); |
| 537 |
|
| 538 |
// Determine if a rule exists for this request. |
| 539 |
$rule = array_reduce( |
| 540 |
$exp, |
| 541 |
function ( $o, $p ) { |
| 542 |
if ( ! isset( $o->$p ) ) { |
| 543 |
return null; |
| 544 |
} |
| 545 |
|
| 546 |
return $o->$p; |
| 547 |
}, |
| 548 |
$rule_terms |
| 549 |
); |
| 550 |
|
| 551 |
// Determine if the rule matches the request. |
| 552 |
if ( ! is_null( $rule ) && substr( $key, 0, 4 ) == 'rule' && $this->is_rule_match( $rule, $request ) ) { |
| 553 |
$blocked_count++; |
| 554 |
} |
| 555 |
} |
| 556 |
} |
| 557 |
|
| 558 |
// Determine if the user should be blocked. |
| 559 |
if ( $blocked_count >= $count_rules ) { |
| 560 |
if ( $rule_terms->type == 'BLOCK' ) { |
| 561 |
$this->block_user( $firewall_rule['id'], (bool) $firewall_rule['bypass_whitelist'] ); |
| 562 |
} elseif ( $rule_terms->type == 'LOG' ) { |
| 563 |
$this->log_user( $firewall_rule['id'] ); |
| 564 |
} elseif ( $rule_terms->type == 'REDIRECT' ) { |
| 565 |
$this->redirect_user( $firewall_rule['id'], $rule_terms->type_params ); |
| 566 |
} |
| 567 |
} |
| 568 |
} |
| 569 |
} |
| 570 |
|
| 571 |
/** |
| 572 |
* Determine if the current request is a file upload. |
| 573 |
* |
| 574 |
* @return boolean |
| 575 |
*/ |
| 576 |
private function is_file_upload() { |
| 577 |
return isset( $_FILES ) && count( $_FILES ) > 0; |
| 578 |
} |
| 579 |
|
| 580 |
/** |
| 581 |
* Automatically block the user if there are many blocked requests in a short period of time. |
| 582 |
* |
| 583 |
* @return integer |
| 584 |
*/ |
| 585 |
public function is_auto_ip_blocked() { |
| 586 |
// Calculate block time. |
| 587 |
$minutes = (int) $this->get_option( 'patchstack_autoblock_minutes', 30 ); |
| 588 |
$timeout = (int) $this->get_option( 'patchstack_autoblock_blocktime', 60 ); |
| 589 |
if ( empty( $minutes ) || empty( $timeout ) ) { |
| 590 |
$time = 30 + 60; |
| 591 |
} else { |
| 592 |
$time = $minutes + $timeout; |
| 593 |
} |
| 594 |
|
| 595 |
// Determine if the user should be blocked. |
| 596 |
global $wpdb; |
| 597 |
$results = $wpdb->get_results( |
| 598 |
$wpdb->prepare( 'SELECT COUNT(*) as numIps FROM ' . $wpdb->prefix . "patchstack_firewall_log WHERE block_type = 'BLOCK' AND apply_ban = 1 AND ip = '%s' AND log_date >= ('" . current_time( 'mysql' ) . "' - INTERVAL %d MINUTE)", array( $this->get_ip(), $time ) ), |
| 599 |
OBJECT |
| 600 |
); |
| 601 |
|
| 602 |
if ( ! isset( $results, $results[0], $results[0]->numIps ) ) { |
| 603 |
return 0; |
| 604 |
} |
| 605 |
return $results[0]->numIps; |
| 606 |
} |
| 607 |
|
| 608 |
/** |
| 609 |
* Block the user, and log, do whatever is necessary. |
| 610 |
* |
| 611 |
* @param string $rule |
| 612 |
* @param bool $bypass |
| 613 |
* @return void |
| 614 |
*/ |
| 615 |
private function block_user( $rule, $bypass = false ) { |
| 616 |
if ( ! $this->is_authenticated( $bypass ) ) { |
| 617 |
$this->display_error_page( '55' . intval( $rule ) ); |
| 618 |
} |
| 619 |
} |
| 620 |
|
| 621 |
/** |
| 622 |
* Log the user action. |
| 623 |
* |
| 624 |
* @param string $rule |
| 625 |
* @return void |
| 626 |
*/ |
| 627 |
private function log_user( $rule ) { |
| 628 |
$this->log_hacker( $rule, '', 'LOG' ); |
| 629 |
} |
| 630 |
|
| 631 |
/** |
| 632 |
* Log the user action and redirect. |
| 633 |
* |
| 634 |
* @param integer $rule_id |
| 635 |
* @param string $redirect |
| 636 |
* @return void |
| 637 |
*/ |
| 638 |
private function redirect_user( $rule_id, $redirect ) { |
| 639 |
$this->log_hacker( $rule_id, '', 'REDIRECT' ); |
| 640 |
|
| 641 |
// Don't redirect an invalid URL. |
| 642 |
if ( ! $redirect || stripos( $redirect, 'http' ) === false ) { |
| 643 |
return; |
| 644 |
} |
| 645 |
|
| 646 |
ob_start(); |
| 647 |
header( 'Location: ' . $redirect ); |
| 648 |
ob_end_flush(); |
| 649 |
exit; |
| 650 |
} |
| 651 |
|
| 652 |
/** |
| 653 |
* Determine if the user is authenticated and in the list of whitelisted roles. |
| 654 |
* |
| 655 |
* @param bool $bypass |
| 656 |
* @return bool |
| 657 |
*/ |
| 658 |
public function is_authenticated( $bypass = false ) { |
| 659 |
if ( $bypass || ! is_user_logged_in() ) { |
| 660 |
return false; |
| 661 |
} |
| 662 |
|
| 663 |
// Get the whitelisted roles. |
| 664 |
$roles = $this->get_option( 'patchstack_basic_firewall_roles', array( 'administrator', 'editor', 'author' ) ); |
| 665 |
if ( ! is_array ( $roles ) ) { |
| 666 |
return false; |
| 667 |
} |
| 668 |
|
| 669 |
// Special scenario for super admins on a multisite environment. |
| 670 |
if ( in_array( 'administrator', $roles ) && is_multisite() && is_super_admin() ) { |
| 671 |
return true; |
| 672 |
} |
| 673 |
|
| 674 |
// User is logged in, determine the role. |
| 675 |
$user = wp_get_current_user(); |
| 676 |
if ( ! isset( $user->roles ) || count( (array) $user->roles ) == 0 ) { |
| 677 |
return false; |
| 678 |
} |
| 679 |
|
| 680 |
// Is the user in the whitelist roles list? |
| 681 |
$role_count = array_intersect( $user->roles, $roles ); |
| 682 |
return count( $role_count ) != 0; |
| 683 |
} |
| 684 |
|
| 685 |
/** |
| 686 |
* Log the blocked request. |
| 687 |
* |
| 688 |
* @param integer $fid firewall |
| 689 |
* @param array $query_vars |
| 690 |
* @param string $block_type |
| 691 |
* @param array $block_params |
| 692 |
* @return void |
| 693 |
*/ |
| 694 |
private function log_hacker( $fid = 1, $post_data = '', $block_type = 'BLOCK' ) { |
| 695 |
global $wpdb; |
| 696 |
if ( ! $wpdb || $fid == 22 || $fid == 23 ) { |
| 697 |
return; |
| 698 |
} |
| 699 |
|
| 700 |
// Insert into the logs. |
| 701 |
$wpdb->insert( |
| 702 |
$wpdb->prefix . 'patchstack_firewall_log', |
| 703 |
array( |
| 704 |
'ip' => $this->get_ip(), |
| 705 |
'request_uri' => isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '', |
| 706 |
'user_agent' => isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : '', |
| 707 |
'method' => isset( $_SERVER['REQUEST_METHOD'] ) ? $_SERVER['REQUEST_METHOD'] : '', |
| 708 |
'fid' => $fid, |
| 709 |
'flag' => '', |
| 710 |
'post_data' => $post_data != '' ? json_encode( $post_data ) : $this->get_post_data(), |
| 711 |
'block_type' => $block_type, |
| 712 |
) |
| 713 |
); |
| 714 |
} |
| 715 |
|
| 716 |
/** |
| 717 |
* Get POST data. |
| 718 |
* |
| 719 |
* @return string|NULL |
| 720 |
*/ |
| 721 |
private function get_post_data() { |
| 722 |
if ( ! isset( $_SERVER['REQUEST_METHOD'] ) || $_SERVER['REQUEST_METHOD'] != 'POST' ) { |
| 723 |
return null; |
| 724 |
} |
| 725 |
|
| 726 |
return json_encode( $_POST ); |
| 727 |
} |
| 728 |
|
| 729 |
/** |
| 730 |
* Display error page. |
| 731 |
* |
| 732 |
* @param integer $fid |
| 733 |
* @return void |
| 734 |
*/ |
| 735 |
public function display_error_page( $fid = 1 ) { |
| 736 |
if ( $fid != 22 && $fid != 23 && $fid != 'login' ) { |
| 737 |
$this->log_hacker( $fid ); |
| 738 |
} |
| 739 |
|
| 740 |
header( 'Cache-Control: no-store' ); |
| 741 |
header( 'Pragma: no-cache' ); |
| 742 |
http_response_code( 403 ); |
| 743 |
|
| 744 |
if ($fid == 'login' ) { |
| 745 |
require_once dirname( __FILE__ ) . '/views/access-denied-login.php'; |
| 746 |
} else { |
| 747 |
require_once dirname( __FILE__ ) . '/views/access-denied.php'; |
| 748 |
} |
| 749 |
|
| 750 |
exit; |
| 751 |
} |
| 752 |
} |
| 753 |
|
