phpvulhunter/FileSummaryGenerator.php at master · OneSourceCat/phpvulhunter · GitHub

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<?php

class FileSummaryGenerator {

/**
 * 获取当前文件include的所有文件的summary
 * @param FileSummary $fileSummary
 * @return array(fileSummarys)
 */
publicstaticfunctiongetIncludeFilesDataFlows($fileSummary){
if (!is_object($fileSummary)){
return;
 }
//1.得到include files
$includeFiles = $fileSummary->getIncludeMap();
$currentFilePath = $fileSummary->getPath();
//2.foreach() files
$retFileSummary = array();
foreach ($includeFilesas$rpath){
$absPath = FileUtils::getAbsPath($currentFilePath, $rpath);
if (!$absPath){
continue;
 }
// 查看是否在fileSummaryContext中
// 得到DataFlows
$fileSummaryContext = FileSummaryContext::getInstance();
$ret = $fileSummaryContext->findSummaryByPath($absPath);
if (is_object($ret)){
//查看此文件是否有include文件
$pRetFiles = self::getIncludeFilesDataFlows($ret);
$retFileSummary = array_merge($pRetFiles, $retFileSummary);
$retFileSummary = array_merge(array($ret), $retFileSummary);
 }else{
$includeFileSummary = self::getFileSummary($absPath);
if (is_object($includeFileSummary)){
$pRetFiles = self::getIncludeFilesDataFlows($includeFileSummary);
$retFileSummary = array_merge($pRetFiles, $retFileSummary);
$retFileSummary = array_merge(array($includeFileSummary), $retFileSummary);
 }

 }
 }
//return all files summary
//include在前的，在数组前面
return$retFileSummary;
 }

/**
 * 得到一个文件基本信息FileSummary，包括
 * @param string $absPath
 */
publicstaticfunctiongetFileSummary($absPath){
if (!$absPath){
return ;
 }
$visitor = newMyVisitor() ;
$parser = newPhpParser\Parser(newPhpParser\Lexer\Emulative) ;
$traverser = newPhpParser\NodeTraverser ;
$code = file_get_contents($absPath);
try {
$stmts = $parser->parse($code);
 } catch (Exception$e) {
return ;
 }

$traverser->addVisitor($visitor) ;
$traverser->traverse($stmts) ;
$nodes = $visitor->getNodes() ;

$fileSummary = newFileSummary();
$fileSummary->setPath($absPath);

$currBlock = newBasicBlock() ;
foreach ($nodesas$node){
if(!is_object($node)) continue ;

//不分析函数定义
if($node->getType() == "Stmt_Function"){
continue ;
 }
$currBlock->addNode($node);
 }


$fileSummaryGenerator = newFileSummaryGenerator();
$fileSummaryGenerator->simulate($currBlock, $fileSummary);
return$fileSummary;
	}

/**
 * 得到该文件的dataFlows
 * @param Nodes $nodes
 */
publicfunctionsimulate($block, $fileSummary){
$nodes = $block->getContainedNodes();
//循环nodes集合，搜集信息加入到中
foreach ($nodesas$node){
//搜集节点中的require include require_once include_once的PHP文件名称
$fileSummary->addIncludeToMap(NodeUtils::getNodeIncludeInfo($node)) ;

switch ($node->getType()){
//处理赋值语句
case'Expr_Assign':
$dataFlow = newDataFlow() ;
$this->assignHandler($node, $dataFlow, "left", $block, $fileSummary) ;
$this->assignHandler($node, $dataFlow, "right", $block, $fileSummary) ;
//处理完一条赋值语句，加入DataFlowMap
$fileSummary->addDataFlow($dataFlow);
$block->getBlockSummary()->addDataFlowItem($dataFlow);
break ;

//处理字符串连接赋值
//$sql .= "from users where"生成sql => "from users where"
case'Expr_AssignOp_Concat':
$dataFlow = newDataFlow() ;
$this->assignConcatHandler($node, $dataFlow, "left", $block, $fileSummary) ;
$this->assignConcatHandler($node, $dataFlow, "right", $block, $fileSummary) ;
//处理完一条赋值语句，加入DataFlowMap
$fileSummary->addDataFlow($dataFlow);
$block->getBlockSummary()->addDataFlowItem($dataFlow);
break ;

default:
break;
 }
 }
	}

/**
 * 处理赋值的assign语句，添加至dataFlows中
 * @param AST $node
 * @param DataFlow $dataFlow
 * @param string $type
 */
publicfunctionassignHandler($node, $dataFlow, $type, $block, $fileSummary){
$part = null ;
if($type == "left"){
$part = $node->var ;
 }elseif($type == "right"){
$part = $node->expr ;
 }else{
return ;
 }

//处理$GLOBALS的赋值
//$GLOBAL['name'] = "chongrui" ; 数据流信息为 $name = "chongrui" ;
if ($part && SymbolUtils::isArrayDimFetch($part) && (substr(NodeUtils::getNodeStringName($part),0,7)=="GLOBALS")){
//加入dataFlow
$arr = newArrayDimFetchSymbol() ;
$arr->setValue($part) ;
if($type == "left"){
$dataFlow->setLocation($arr) ;
$dataFlow->setName(NodeUtils::getNodeGLOBALSNodeName($part)) ;
 }elseif($type == "right"){
$dataFlow->setValue($arr) ;
 }
return ;
 }


//处理赋值语句，存放在DataFlow
//处理赋值语句的左边
if($part && SymbolUtils::isValue($part)){
//在DataFlow加入Location以及name
$vs = newValueSymbol() ;
$vs->setValueByNode($part) ;
if($type == "left"){
$dataFlow->setLocation($vs) ;
$dataFlow->setName($part->name) ;
 }elseif($type == "right"){
$dataFlow->setValue($vs) ;
 }

 }elseif ($part && SymbolUtils::isVariable($part)){

//加入dataFlow
$vars = newVariableSymbol() ;
$vars->setValue($part);
if($type == "left"){
$dataFlow->setLocation($vars) ;
$dataFlow->setName($part->name) ;
 }elseif($type == "right"){
$dataFlow->setValue($part) ;
 }

 }elseif ($part && SymbolUtils::isConstant($part)){

//加入dataFlow
$con = newConstantSymbol() ;
$con->setValueByNode($part) ;
$con->setName($part->name->parts[0]) ;
if($type == "left"){
$dataFlow->setLocation($con) ;
$dataFlow->setName($part->name) ;
 }elseif($type == "right"){
$dataFlow->setValue($con) ;
 }
 }elseif ($part && SymbolUtils::isArrayDimFetch($part)){
//加入dataFlow
$arr = newArrayDimFetchSymbol() ;
$arr->setValue($part) ;
if($type == "left"){
$dataFlow->setLocation($arr) ;
$dataFlow->setName(NodeUtils::getNodeStringName($part)) ;
 }elseif($type == "right"){
$dataFlow->setValue($arr) ;
 }
 }elseif ($part && SymbolUtils::isConcat($part)){
$concat = newConcatSymbol() ;
$concat->setItemByNode($part) ;
if($type == "left"){
$dataFlow->setLocation($concat) ;
$dataFlow->setName($part->name) ;
 }elseif($type == "right"){
$dataFlow->setValue($concat) ;
 }
 }else{
//不属于已有的任何一个symbol类型,如函数调用
if($part && ($part->getType() == "Expr_FuncCall" ||
$part->getType() == "Expr_MethodCall" ||
$part->getType() == "Expr_StaticCall")){
if($type == "left"){
$dataFlow->setLocation($arr) ;
$dataFlow->setName(NodeUtils::getNodeStringName($part)) ;
 }elseif($type == "right"){
//处理净化信息和编码信息
 SanitizationHandler::setSanitiInfo($part, $dataFlow, $block, $fileSummary) ;
 EncodingHandler::setEncodeInfo($part, $dataFlow, $block, $fileSummary) ;
 }
 }
//处理三元表达式
if($part && $part->getType() == "Expr_Ternary"){
 BIFuncUtils::ternaryHandler($type, $part, $dataFlow) ;
 }
 }

	}

/**
 * 处理赋值的concat语句，添加至dataFlows中
 * @param AST $node
 * @param DataFlow $dataFlow
 * @param string $type
 */
privatefunctionassignConcatHandler($node, $dataFlow, $type, $block, $fileSummary){
$this->assignHandler($node, $dataFlow, $type, $block, $fileSummary) ;
	}

}


?>