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<?php if (defined('WFWAF_VERSION') && !defined('WFWAF_RUN_COMPLETE')) { require_once dirname(__FILE__) . '/lexer.php'; class wfWAFRuleParser extends wfWAFBaseParser { /** * @var wfWAF */ private $waf; private $parenCount = 0; /** * wfWAFRuleParser constructor. * @param $lexer * @param wfWAF $waf */ public function __construct($lexer, $waf) { parent::__construct($lexer); $this->setWAF($waf); } /** * @return array * @throws wfWAFParserSyntaxError * @throws wfWAFRuleParserSyntaxError */ public function parse() { $rules = array(); $scores = array(); $blacklistedParams = array(); $whitelistedParams = array(); $variables = array(); $this->index = -1; while ($token = $this->nextToken()) { // Rule parsing if ($token->getType() == wfWAFRuleLexer::T_RULE_START) { $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_OPEN_PARENTHESIS); $comparisonGroup = $this->parseConditional(); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_CLOSE_PARENTHESIS); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_RULE_COMPARISON_END); $action = $this->parseAction(); $rules[] = new wfWAFRule( $this->getWAF(), $action->getRuleID(), $action->getType(), $action->getCategory(), $action->getScore(), $action->getDescription(), $action->getWhitelist(), $action->getAction(), $comparisonGroup ); } // Score/config parsing if ($token->getType() == wfWAFRuleLexer::T_IDENTIFIER) { switch ($token->getValue()) { case 'scores': $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_DOT); $scoreCategoryToken = $this->expectNextToken(); $this->expectTokenTypeEquals($scoreCategoryToken, wfWAFRuleLexer::T_IDENTIFIER); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_ASSIGNMENT); $scoreToken = $this->expectNextToken(); $this->expectTokenTypeEquals($scoreToken, wfWAFRuleLexer::T_NUMBER_LITERAL); $scores[$scoreCategoryToken->getValue()] = $scoreToken->getValue(); break; case 'blacklistParam': $blacklistedParams[] = $this->parseURLParams(); break; case 'whitelistParam': $whitelistedParams[] = $this->parseURLParams(); break; default: $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_ASSIGNMENT); $valueToken = $this->expectNextToken(); $this->expectTokenTypeInArray($valueToken, array( wfWAFRuleLexer::T_SINGLE_STRING_LITERAL, wfWAFRuleLexer::T_DOUBLE_STRING_LITERAL, wfWAFRuleLexer::T_NUMBER_LITERAL, )); if ($valueToken->getType() === wfWAFRuleLexer::T_SINGLE_STRING_LITERAL) { $value = wfWAFUtils::substr($valueToken->getValue(), 1, -1); $value = str_replace("\\'", "'", $value); } else if ($valueToken->getType() === wfWAFRuleLexer::T_DOUBLE_STRING_LITERAL) { $value = wfWAFUtils::substr($valueToken->getValue(), 1, -1); $value = str_replace('\\"', '"', $value); } else { $value = $valueToken->getValue(); } $variables[$token->getValue()] = new wfWAFRuleVariable($this->getWAF(), $token->getValue(), $value); break; } } } return array( 'scores' => $scores, 'blacklistedParams' => $blacklistedParams, 'whitelistedParams' => $whitelistedParams, 'variables' => $variables, 'rules' => $rules, ); } /** * @param array $vars * @return string */ public function renderRules($vars) { $rules = ''; if (array_key_exists('scores', $vars)) { foreach ($vars['scores'] as $category => $score) { // scores.sqli = 100 $rules .= sprintf("scores.%s = %d\n", $category, $score); } $rules .= "\n"; } $params = array( 'blacklistParam' => 'blacklistedParams', 'whitelistParam' => 'whitelistedParams', ); foreach ($params as $action => $key) { if (array_key_exists($key, $vars)) { /** @var wfWAFRuleParserURLParam $urlParam */ foreach ($vars[$key] as $urlParam) { $rules .= $urlParam->renderRule($action) . "\n"; } $rules .= "\n"; } } if (array_key_exists('variables', $vars)) { /** @var wfWAFRuleVariable $variable */ foreach ($vars['variables'] as $variableName => $variable) { $rules .= sprintf("%s = %s\n", $variable->renderRule(), $variable->renderValue()); } $rules .= "\n"; } if (array_key_exists('rules', $vars)) { /** @var wfWAFRule $rule */ foreach ($vars['rules'] as $rule) { $rules .= $rule->renderRule() . "\n"; } $rules .= "\n"; } return $rules; } /** * @param int $index * @return mixed */ public function getToken($index) { if (is_array($this->tokens) && array_key_exists($index, $this->tokens)) { return $this->tokens[$index]; } if ($token = $this->getLexer()->nextToken()) { $this->tokens[$index] = $token; return $this->tokens[$index]; } return false; } /** * @return wfWAFRuleComparisonGroup */ private function parseConditional() { $comparisonGroup = new wfWAFRuleComparisonGroup(); while ($token = $this->nextToken()) { switch ($token->getType()) { case wfWAFRuleLexer::T_IDENTIFIER: $comparisonGroup->add($this->parseComparison()); break; case wfWAFRuleLexer::T_COMPARISON_OPERATOR: $comparisonGroup->add(new wfWAFRuleLogicalOperator($token->getValue())); break; case wfWAFRuleLexer::T_OPEN_PARENTHESIS: $this->parenCount++; $comparisonGroup->add($this->parseConditional()); break; case wfWAFRuleLexer::T_CLOSE_PARENTHESIS: if ($this->parenCount === 0) { $this->index--; return $comparisonGroup; } $this->parenCount--; return $comparisonGroup; } } return $comparisonGroup; } private function parseComparison($expectLiteral = true) { /** * @var wfWAFLexerToken $actionToken * @var wfWAFLexerToken $expectedToken */ $this->setCheckpoint(); $actionToken = $this->currentToken(); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_OPEN_PARENTHESIS); $value=null; if($expectLiteral) { try { $value = $this->expectLiteral(array(wfWAFRuleLexer::T_CLOSE_PARENTHESIS)); if ($value === null && $expectLiteral) { $this->index--; } } catch(wfWAFParserSyntaxError $e) { if($expectLiteral) { $this->reset(); return $this->parseComparison(false); } throw $e; } } $subjects = array(); $nextToken = $this->nextToken(); if ($value!==null||!$expectLiteral) { while (true) { if ($nextToken && $nextToken->getType() === wfWAFRuleLexer::T_CLOSE_PARENTHESIS) { break; } if (!($nextToken && $nextToken->getType() === wfWAFRuleLexer::T_COMMA)) { if(empty($subjects) && $expectLiteral) { $this->reset(); return $this->parseComparison(false); } $this->index--; if(!empty($subjects)) break; } list($filters, $subject) = $this->parseFilters(); $current = new wfWAFRuleComparisonSubject($this->getWAF(), $subject, $filters); $nextToken = $this->expectNextToken(); if (in_array($nextToken->getType(), array(wfWAFRuleLexer::T_DOT, wfWAFRuleLexer::T_OPEN_BRACKET))) { $this->index--; $childSubject = $this->parseSubject(false); if (!is_array($childSubject) ) $childSubject = array($childSubject); array_unshift($childSubject, $current); $current = new wfWAFRuleComparisonSubject($this->getWAF(), $childSubject, array()); $nextToken = $this->expectNextToken(); } $subjects[] = $current; } $this->expectTokenTypeEquals($nextToken, wfWAFRuleLexer::T_CLOSE_PARENTHESIS); } $comparison = new wfWAFRuleComparison($this->getWAF(), $actionToken->getValue(), $value, $subjects); return $comparison; } /** * @return wfWAFRuleParserAction */ private function parseAction() { $action = new wfWAFRuleParserAction(); $actionToken = $this->expectNextToken(); $this->expectTokenTypeEquals($actionToken, wfWAFRuleLexer::T_IDENTIFIER); $action->setAction($actionToken->getValue()); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_OPEN_PARENTHESIS); while (true) { $token = $this->expectNextToken(); switch ($token->getType()) { case wfWAFRuleLexer::T_IDENTIFIER: $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_ASSIGNMENT); $valueToken = $this->expectNextToken(); $this->expectTokenTypeInArray($valueToken, array( wfWAFRuleLexer::T_SINGLE_STRING_LITERAL, wfWAFRuleLexer::T_DOUBLE_STRING_LITERAL, wfWAFRuleLexer::T_NUMBER_LITERAL, )); $action->set($token->getValue(), $valueToken->getValue()); break; case wfWAFRuleLexer::T_COMMA: break; case wfWAFRuleLexer::T_CLOSE_PARENTHESIS: break 2; default: $this->triggerSyntaxError($token, sprintf('Wordfence WAF Rules Syntax Error: Unexpected %s found on line %d, column %d', $token->getType(), $token->getLine(), $token->getColumn())); } } return $action; } private function parseFilters() { $filters = array(); $subject = null; do { $globalToken = $this->expectNextToken(); $this->expectTokenTypeEquals($globalToken, wfWAFRuleLexer::T_IDENTIFIER); $parenToken = $this->expectNextToken(); switch ($parenToken->getType()) { case wfWAFRuleLexer::T_DOT: $this->index -= 2; $subject = $this->parseSubject(); break 2; case wfWAFRuleLexer::T_OPEN_PARENTHESIS: array_unshift($filters, array($globalToken->getValue())); break; default: $this->triggerSyntaxError($parenToken, sprintf('Wordfence WAF Rules Syntax Error: Unexpected %s found on line %d, column %d.', $parenToken->getType(), $parenToken->getLine(), $parenToken->getColumn())); } } while (true); if ($subject === null) { throw new wfWAFParserSyntaxError('No subject supplied to filter'); } for ($i = 0; $i < count($filters); $i++) { do { $next = $this->expectNextToken(); $this->expectTokenTypeInArray($next, array(wfWAFRuleLexer::T_CLOSE_PARENTHESIS, wfWAFRuleLexer::T_COMMA)); if ($next->getType() === wfWAFRuleLexer::T_COMMA) { $filters[$i][] = $this->expectLiteral(); } else { break; } } while(true); } return array($filters, $subject); } /** * @throws wfWAFParserSyntaxError */ private function parseSubject($global = true) { if ($global) { $globalToken = $this->expectNextToken(); $this->expectTokenTypeEquals($globalToken, wfWAFRuleLexer::T_IDENTIFIER); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_DOT); $globalToken2 = $this->expectNextToken(); $this->expectTokenTypeEquals($globalToken2, wfWAFRuleLexer::T_IDENTIFIER); $subject = array( $globalToken->getValue() . '.' . $globalToken2->getValue(), ); } else { $subject = array(); } $savePoint = $this->index; while (($property = $this->parsePropertyAccessor()) !== false) { $subject[] = $property; $savePoint = $this->index; } $this->index = $savePoint; if (count($subject) === 1) { list($subject) = $subject; } return $subject; } /** * @return bool|mixed|string * @throws wfWAFParserSyntaxError */ private function parsePropertyAccessor() { $savePoint = $this->index; $nextToken = $this->nextToken(); if ($this->isTokenOfType($nextToken, wfWAFRuleLexer::T_DOT)) { $property = $this->expectNextToken(); $this->expectTokenTypeEquals($property, wfWAFRuleLexer::T_IDENTIFIER); return $property->getValue(); } else if ($this->isTokenOfType($nextToken, wfWAFRuleLexer::T_OPEN_BRACKET)) { $property = $this->expectLiteral(); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_CLOSE_BRACKET); return $property; } $this->index = $savePoint; return false; } /** * @return wfWAFRuleParserURLParam * @throws wfWAFParserSyntaxError */ private function parseURLParams() { $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_OPEN_PARENTHESIS); $urlParam = new wfWAFRuleParserURLParam(); while (true) { $token = $this->expectNextToken(); switch ($token->getType()) { case wfWAFRuleLexer::T_IDENTIFIER: $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_ASSIGNMENT); if ($token->getValue() === 'url') { $url = $this->expectLiteral(); $urlParam->setUrl($url); } else if ($token->getValue() === 'param') { $subject = $this->parseSubject(); $urlParam->setParam(wfWAFRuleComparison::getSubjectKey($subject)); } else if ($token->getValue() === 'rules') { $rules = $this->expectLiteral(); $urlParam->setRules($rules); } else if ($token->getValue() === 'conditional') { $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_OPEN_PARENTHESIS); $conditional = $this->parseConditional(); $this->expectTokenTypeEquals($this->expectNextToken(), wfWAFRuleLexer::T_CLOSE_PARENTHESIS); $urlParam->setConditional($conditional); } else if ($token->getValue() === 'minVersion') { $minVersion = $this->expectLiteral(); $urlParam->setMinVersion($minVersion); } break; case wfWAFRuleLexer::T_COMMA: break; case wfWAFRuleLexer::T_CLOSE_PARENTHESIS: break 2; default: $this->triggerSyntaxError($token, sprintf('Wordfence WAF Rules Syntax Error: Unexpected %s found on line %d, column %d', $token->getType(), $token->getLine(), $token->getColumn())); } } return $urlParam; } /** * @return mixed|string * @throws wfWAFRuleParserSyntaxError */ private function expectLiteral($allowExtra = array()) { $expectedToken = $this->expectNextToken(); $this->expectTokenTypeInArray($expectedToken, array_merge(array( wfWAFRuleLexer::T_SINGLE_STRING_LITERAL, wfWAFRuleLexer::T_DOUBLE_STRING_LITERAL, wfWAFRuleLexer::T_IDENTIFIER, wfWAFRuleLexer::T_NUMBER_LITERAL, wfWAFRuleLexer::T_OPEN_BRACKET, ), $allowExtra)); if ($expectedToken->getType() === wfWAFRuleLexer::T_SINGLE_STRING_LITERAL) { // Remove quotes, strip slashes $value = wfWAFUtils::substr($expectedToken->getValue(), 1, -1); $value = str_replace("\\'", "'", $value); } else if ($expectedToken->getType() === wfWAFRuleLexer::T_DOUBLE_STRING_LITERAL) { // Remove quotes, strip slashes $value = wfWAFUtils::substr($expectedToken->getValue(), 1, -1); $value = str_replace('\\"', '"', $value); } else if ($expectedToken->getType() === wfWAFRuleLexer::T_IDENTIFIER) { // Remove quotes, strip slashes $value = new wfWAFRuleVariable($this->getWAF(), $expectedToken->getValue()); } else if ($expectedToken->getType() === wfWAFRuleLexer::T_OPEN_BRACKET) { $value = array(); while (true) { $nextToken = $this->expectNextToken(); if ($nextToken->getType() === wfWAFRuleLexer::T_CLOSE_BRACKET) { break; } if ($nextToken->getType() === wfWAFRuleLexer::T_COMMA) { continue; } $this->index--; $value[] = $this->expectLiteral(); } } else if (in_array($expectedToken->getType(), $allowExtra)) { return null; } else { $value = $expectedToken->getValue(); } return $value; } /** * @param wfWAFLexerToken $token * @param string|array $value * @return bool */ private function isIdentifierWithValue($token, $value) { return $token && $token->getType() === wfWAFRuleLexer::T_IDENTIFIER && (is_array($value) ? in_array($token->getLowerCaseValue(), array_map('strtolower', $value)) : $token->getLowerCaseValue() === strtolower($value)); } /** * @param wfWAFLexerToken $token * @return bool */ protected function isCommentToken($token) { return $token->getType() === wfWAFRuleLexer::T_MULTIPLE_LINE_COMMENT || $token->getType() === wfWAFRuleLexer::T_SINGLE_LINE_COMMENT; } /** * @return wfWAF */ public function getWAF() { return $this->waf; } /** * @param wfWAF $waf */ public function setWAF($waf) { $this->waf = $waf; } } class wfWAFRuleParserAction { private $ruleID; private $type; private $category; private $score; private $description; private $whitelist = 1; private $action; /** * @param string $param * @param mixed $value */ public function set($param, $value) { $propLinkTable = array( 'id' => 'ruleID', ); if (array_key_exists($param, $propLinkTable)) { $param = $propLinkTable[$param]; } if (property_exists($this, $param)) { $this->$param = trim($value, '\'"'); } } /** * @return mixed */ public function getRuleID() { return $this->ruleID; } /** * @param mixed $ruleID */ public function setRuleID($ruleID) { $this->ruleID = $ruleID; } /** * @return mixed */ public function getType() { return $this->type; } /** * @param mixed $type */ public function setType($type) { $this->type = $type; } /** * @return mixed */ public function getCategory() { return $this->category; } /** * @param mixed $category */ public function setCategory($category) { $this->category = $category; } /** * @return mixed */ public function getScore() { return $this->score; } /** * @param mixed $score */ public function setScore($score) { $this->score = $score; } /** * @return mixed */ public function getDescription() { return $this->description; } /** * @param mixed $description */ public function setDescription($description) { $this->description = $description; } /** * @return mixed */ public function getWhitelist() { return $this->whitelist; } /** * @param mixed $whitelist */ public function setWhitelist($whitelist) { $this->whitelist = $whitelist; } /** * @return mixed */ public function getAction() { return $this->action; } /** * @param mixed $action */ public function setAction($action) { $this->action = $action; } } class wfWAFRuleParserURLParam { /** * @var string */ private $url; /** * @var string */ private $param; /** * @var null */ private $rules; /** * @var null */ private $conditional; /** * @var float */ private $minVersion; /** * @param string $param * @param mixed $value */ public function set($param, $value) { if (property_exists($this, $param)) { $this->$param = trim($value, '\'"'); } } /** * @param string $url * @param string $param * @param null $rules */ public function __construct($url = null, $param = null, $rules = null, $conditional = null, $minVersion = null) { $this->url = $url; $this->param = $param; $this->rules = $rules; $this->conditional = $conditional; $this->minVersion = $minVersion; } /** * Return format: * blacklistParam(url='/\/uploadify\.php$/i', param=request.fileNames.Filedata, rules=[3, 14], conditional=(match('1', request.body.field))) * * @param string $action * @return string */ public function renderRule($action) { return sprintf('%s(url=%s, param=%s%s%s)', $action, wfWAFRule::exportString($this->getUrl()), $this->renderParam($this->getParam()), $this->getRules() ? ', rules=[' . join(', ', array_map('intval', $this->getRules())) . ']' : '', $this->getConditional() ? ', conditional=(' . $this->getConditional()->renderRule() . ')' : ''); //minVersion not included in re-rendering } /** * @param string $param * @return mixed */ private function renderParam($param) { if (preg_match('/([a-zA-Z_][\\w_]*?\\.[a-zA-Z_][\\w_]*)(.*)/', $param, $matches)) { list(, $global, $params) = $matches; if (strlen($params) > 0) { if (preg_match_all('/\\[([^\\]]*?)\\]/', $params, $matches)) { $rendered = $global; foreach ($matches[1] as $prop) { $single = "'" . str_replace(array("'", '\\'), array("\\'", "\\\\"), $prop) . "'"; $double = '"' . str_replace(array('"', '\\'), array('\\"', "\\\\"), $prop) . '"'; $rendered .= sprintf('[%s]', strlen($single) <= strlen($double) ? $single : $double); } return $rendered; } } } return $param; } /** * @return string */ public function getUrl() { return $this->url; } /** * @param string $url */ public function setUrl($url) { $this->url = $url; } /** * @return string */ public function getParam() { return $this->param; } /** * @param string $param */ public function setParam($param) { $this->param = $param; } /** * @return null */ public function getRules() { return $this->rules; } /** * @param null $rules */ public function setRules($rules) { $this->rules = $rules; } /** * @return null */ public function getConditional() { return $this->conditional; } /** * @param null $conditional */ public function setConditional($conditional) { $this->conditional = $conditional; } /** * @return float|null */ public function getMinVersion() { return $this->minVersion; } /** * @param float $minVersion */ public function setMinVersion($minVersion) { $this->minVersion = $minVersion; } } class wfWAFRuleParserSyntaxError extends wfWAFParserSyntaxError { private $token; /** * @return mixed */ public function getToken() { return $this->token; } /** * @param mixed $token */ public function setToken($token) { $this->token = $token; } } class wfWAFRuleVariable { /** * @var string */ private $name; /** * @var mixed|null */ private $value; /** * @var wfWAF */ private $waf; /** * wfWAFRuleVariable constructor. * @param wfWAF $waf * @param string $name * @param mixed $value */ public function __construct($waf, $name, $value = null) { $this->waf = $waf; $this->name = $name; $this->value = $value; } public function __sleep() { return array( 'name', 'value', ); } public function render() { return sprintf('new %s($this, %s, %s)', get_class($this), var_export($this->getName(), true), var_export($this->getValue(), true)); } public function renderRule() { return sprintf('%s', $this->getName()); } public function renderValue() { return wfWAFRule::exportString($this); } public function __toString() { $value = $this->getValue(); if (is_string($value)) { return $value; } return (string) $this->getWAF()->getVariable($this->getName()); } /** * @return string */ public function getName() { return $this->name; } /** * @param string $name */ public function setName($name) { $this->name = $name; } /** * @return mixed|null */ public function getValue() { return $this->value; } /** * @param mixed|null $value */ public function setValue($value) { $this->value = $value; } /** * @return wfWAF */ public function getWAF() { return $this->waf; } /** * @param wfWAF $waf */ public function setWAF($waf) { $this->waf = $waf; } } }
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