/**
* 处理赋值的assign语句，添加至dataFlows中
* @param AST $node
* @param DataFlow $dataFlow
* @param string $type
*/
public function assignHandler($node, $dataFlow, $type, $block, $fileSummary)
{
$part = null;
if ($type == "left") {
$part = $node->var;
} else {
if ($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 = new ArrayDimFetchSymbol();
$arr->setValue($part);
if ($type == "left") {
$dataFlow->setLocation($arr);
$dataFlow->setName(NodeUtils::getNodeGLOBALSNodeName($part));
} else {
if ($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 = new ValueSymbol();
$vs->setValueByNode($part);
if ($type == "left") {
$dataFlow->setLocation($vs);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($vs);
}
}
} elseif ($part && SymbolUtils::isVariable($part)) {
//加入dataFlow
$vars = new VariableSymbol();
$vars->setValue($part);
if ($type == "left") {
$dataFlow->setLocation($vars);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($part);
}
}
} elseif ($part && SymbolUtils::isConstant($part)) {
//加入dataFlow
$con = new ConstantSymbol();
$con->setValueByNode($part);
$con->setName($part->name->parts[0]);
if ($type == "left") {
$dataFlow->setLocation($con);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($con);
}
}
} elseif ($part && SymbolUtils::isArrayDimFetch($part)) {
//加入dataFlow
$arr = new ArrayDimFetchSymbol();
$arr->setValue($part);
if ($type == "left") {
$dataFlow->setLocation($arr);
$dataFlow->setName(NodeUtils::getNodeStringName($part));
} else {
if ($type == "right") {
$dataFlow->setValue($arr);
}
}
} elseif ($part && SymbolUtils::isConcat($part)) {
$concat = new ConcatSymbol();
$concat->setItemByNode($part);
if ($type == "left") {
$dataFlow->setLocation($concat);
$dataFlow->setName($part->name);
} else {
if ($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));
} else {
if ($type == "right") {
//处理净化信息和编码信息
SanitizationHandler::setSanitiInfo($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);
}
}
}
/**
* 获取concat中的所有变量名
* @param Node $node
*/
private static function getConcatParamsNode($node)
{
$retArr = array();
if ($node->getType() != "Expr_BinaryOp_Concat") {
return $retArr;
}
$symbol = new ConcatSymbol();
$symbol->setItemByNode($node);
$items = $symbol->getItems();
foreach ($items as $item) {
if ($item instanceof ValueSymbol) {
continue;
}
array_push($retArr, $item->getValue());
}
return $retArr;
}
/**
* 根据AST node获取相应的symbol
* @param unknown $node
*/
public static function getSymbolByNode($node)
{
if ($node && SymbolUtils::isValue($node)) {
//在DataFlow加入Location以及name
$vs = new ValueSymbol();
$vs->setValueByNode($node);
return $vs;
} elseif ($node && SymbolUtils::isVariable($node)) {
//加入dataFlow
$vars = new VariableSymbol();
$vars->setNameByNode($node);
$vars->setValue($node);
return $vars;
} elseif ($node && SymbolUtils::isArrayDimFetch($node)) {
//加入dataFlow
$arr = new ArrayDimFetchSymbol();
$arr->setValue($node);
return $arr;
} elseif ($node && SymbolUtils::isConcat($node)) {
$concat = new ConcatSymbol();
$concat->setItemByNode($node);
return $concat;
} elseif ($node && $node->getType() == "Scalar_Encapsed") {
$arr = array();
$symbol = new MutipleSymbol();
foreach ($node->parts as $item) {
if (is_object($item) && self::isValue($item) == false) {
$sym = self::getSymbolByNode($item);
array_push($arr, $sym);
}
}
$symbol->setSymbols($arr);
return $symbol;
} else {
return null;
}
}
public function leaveNode(Node $node)
{
global $SECURES_TYPE_ALL;
if (!$node instanceof Node) {
return null;
}
if ($node->getType() == 'Stmt_Return') {
$part = $node->expr;
if (SymbolUtils::isValue($part)) {
//return value
if (!is_array($this->sanitiInfo['type'])) {
$this->sanitiInfo['type'] = array($this->sanitiInfo['type']);
}
$type = array_intersect($this->sanitiInfo['type'], $SECURES_TYPE_ALL);
$this->sanitiInfo = array(true, 'type' => $type);
} elseif (SymbolUtils::isVariable($part)) {
//return variable
$context = Context::getInstance();
$funcBody = $context->getFunctionBody($this->funcName);
if (!$funcBody) {
return null;
}
$nodes = $funcBody->stmts;
$cfg = new CFGGenerator();
$block = $cfg->CFGBuilder($nodes, NULL, NULL, NULL);
$ret = $this->sanitiMultiBlockHandler($node->expr, $block);
if ($ret[0]) {
$type = array_intersect($this->sanitiInfo['type'], $ret['type']);
$this->sanitiInfo = array(true, 'type' => $type);
} else {
$this->sanitiInfo = null;
}
} elseif (SymbolUtils::isConstant($part)) {
//return constant
$type = array_intersect($this->sanitiInfo['type'], $SECURES_TYPE_ALL);
$this->sanitiInfo = array(true, 'type' => $type);
} elseif (SymbolUtils::isArrayDimFetch($part)) {
//return array
$context = Context::getInstance();
$funcBody = $context->getFunctionBody($this->funcName);
if (!$funcBody) {
return null;
}
$nodes = $funcBody->stmts;
$cfg = new CFGGenerator();
$block = $cfg->CFGBuilder($nodes, NULL, NULL, NULL);
$ret = $this->sanitiMultiBlockHandler($node->expr, $block);
if ($ret[0]) {
$type = array_intersect($this->sanitiInfo['type'], $ret['type']);
$this->sanitiInfo = array(true, 'type' => $type);
} else {
$this->sanitiInfo = null;
}
} elseif (SymbolUtils::isConcat($part)) {
//return concat
$concat = new ConcatSymbol();
$concat->setItemByNode($part);
$items = $concat->getItems();
if (!$items) {
return null;
}
$context = Context::getInstance();
$funcBody = $context->getFunctionBody($this->funcName);
if (!$funcBody) {
return null;
}
$nodes = $funcBody->stmts;
$cfg = new CFGGenerator();
$block = $cfg->CFGBuilder($nodes, NULL, NULL, NULL);
$retarr = $SECURES_TYPE_ALL;
foreach ($items as $item) {
$ret = $this->sanitiMultiBlockHandler($item, $block);
if ($ret[0]) {
$retarr = array_intersect($retarr, $ret['type']);
} else {
$this->sanitiInfo = array(false);
break;
}
}
$this->sanitiInfo = array(true, 'type' => $retarr);
} else {
//处理函数调用
if ($part->getType() == 'Expr_FuncCall' || $part->getType() == 'Expr_MethodCall' || $part->getType() == 'Expr_StaticCall') {
$ret = SanitizationHandler::SantiniFuncHandler($part, $this->fileSummary);
if ($ret) {
$saniType = $ret->getSanitiType();
if (is_array($saniType[0])) {
$saniType = $saniType[0];
}
$type = array_intersect($this->sanitiInfo['type'], $saniType);
$this->sanitiInfo = array(true, 'type' => $type);
}
}
}
} else {
return null;
}
}
/**
* 分析传入node赋值语句，以及当前block,
* 生成block summary中的一条记录
* @param ASTNode $node 赋值语句
* @param BasicBlock $block
* @param string $type 处理赋值语句的var和expr类型（left or right）
*/
private function assignHandler($node, $block, $dataFlow, $type)
{
global $scan_type;
$part = null;
if ($type == "left") {
$part = $node->var;
} else {
if ($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 = new ArrayDimFetchSymbol();
$arr->setValue($part);
if ($type == "left") {
$dataFlow->setLocation($arr);
$dataFlow->setName(NodeUtils::getNodeGLOBALSNodeName($part));
//加入registerglobal
$this->registerGLOBALSHandler($part, $block);
} else {
if ($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 = new ValueSymbol();
$vs->setValueByNode($part);
if ($type == "left") {
$dataFlow->setLocation($vs);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($vs);
}
}
} elseif ($part && SymbolUtils::isVariable($part)) {
//加入dataFlow
$vars = new VariableSymbol();
$vars->setValue($part);
if ($type == "left") {
$dataFlow->setLocation($vars);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($part);
}
}
} elseif ($part && SymbolUtils::isConstant($part)) {
//加入dataFlow
$con = new ConstantSymbol();
$con->setValueByNode($part);
$con->setName($part->name->parts[0]);
if ($type == "left") {
$dataFlow->setLocation($con);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($con);
}
}
} elseif ($part && SymbolUtils::isArrayDimFetch($part)) {
//加入dataFlow
$arr = new ArrayDimFetchSymbol();
$arr->setValue($part);
$arr->setNameByNode($node);
if ($type == "left") {
$dataFlow->setLocation($arr);
$dataFlow->setName(NodeUtils::getNodeStringName($part));
} else {
if ($type == "right") {
$dataFlow->setValue($arr);
}
}
} elseif ($part && SymbolUtils::isConcat($part)) {
$concat = new ConcatSymbol();
$concat->setItemByNode($part);
if ($type == "left") {
$dataFlow->setLocation($concat);
$dataFlow->setName($part->name);
} else {
if ($type == "right") {
$dataFlow->setValue($concat);
}
}
} else {
//不属于已有的任何一个symbol类型,如函数调用,类型转换
if ($part && ($part->getType() == "Expr_FuncCall" || $part->getType() == "Expr_MethodCall" || $part->getType() == "Expr_StaticCall")) {
//处理 id = urlencode($_GET['id']) ;
if ($type == 'right' && !SymbolUtils::isValue($part)) {
$funcName = NodeUtils::getNodeFunctionName($part);
BIFuncUtils::assignFuncHandler($part, $type, $dataFlow, $funcName);
if ($dataFlow->getValue() != null) {
//如果处理完函数赋值，则立即返回
$block->getBlockSummary()->addDataFlowItem($dataFlow);
return;
} else {
//处理 id = urlencode($_GET['id']) ;
//检查是否为sink函数
$this->functionHandler($part, $block, $this->fileSummary);
//处理净化信息和编码信息
SanitizationHandler::setSanitiInfo($part, $dataFlow, $block, $this->fileSummary);
EncodingHandler::setEncodeInfo($part, $dataFlow, $block, $this->fileSummary);
}
}
}
//处理类型强制转换
if ($part && ($part->getType() == "Expr_Cast_Int" || $part->getType() == "Expr_Cast_Double") && $type == "right") {
$dataFlow->getLocation()->setType("int");
$symbol = SymbolUtils::getSymbolByNode($part->expr);
$dataFlow->setValue($symbol);
}
//处理三元表达式
if ($part && $part->getType() == "Expr_Ternary") {
BIFuncUtils::ternaryHandler($type, $part, $dataFlow);
}
//处理双引号中包含的变量
if ($part && $part->getType() == "Scalar_Encapsed") {
$symbol = SymbolUtils::getSymbolByNode($part);
$dataFlow->setValue($symbol);
}
}
//else
//处理完一条赋值语句，加入DataFlowMap
if ($type == "right") {
$block->getBlockSummary()->addDataFlowItem($dataFlow);
}
}