function find_class_name(string $file, $node, string $namespace, $current_class, $current_scope, &$static_call_ok = false) : string
{
global $classes, $scope;
if (!$node instanceof \ast\Node) {
return $node;
}
$class_name = $return = '';
switch ($node->kind) {
case \ast\AST_NEW:
case \ast\AST_STATIC_CALL:
case \ast\AST_CLASS_CONST:
if ($node->children[0]->kind == \ast\AST_NAME) {
$class_name = $node->children[0]->children[0];
if ($class_name == 'self' || $class_name == 'static' || $class_name == 'parent') {
if (!$current_class) {
Log::err(Log::ESTATIC, "Cannot access {$class_name}:: when no class scope is active", $file, $node->lineno);
return '';
}
if ($class_name == 'static') {
$class_name = $current_class['name'];
} else {
if ($class_name == 'self') {
if ($current_scope != 'global') {
list($class_name, ) = explode('::', $current_scope);
} else {
$class_name = $current_class['name'];
}
} else {
if ($class_name == 'parent') {
$class_name = $current_class['parent'];
}
}
}
$static_call_ok = true;
} else {
$class_name = qualified_name($file, $node->children[0], $namespace);
}
}
break;
case \ast\AST_INSTANCEOF:
if ($node->children[1]->kind == \ast\AST_NAME) {
$class_name = qualified_name($file, $node->children[1], $namespace);
}
break;
case \ast\AST_METHOD_CALL:
case \ast\AST_PROP:
if ($node->children[0]->kind == \ast\AST_VAR) {
if (!$node->children[0]->children[0] instanceof \ast\Node) {
// $var->method()
if ($node->children[0]->children[0] == 'this') {
if (!$current_class) {
Log::err(Log::ESTATIC, 'Using $this when not in object context', $file, $node->lineno);
return '';
}
}
if (empty($scope[$current_scope]['vars'][$node->children[0]->children[0]])) {
// Got lost, couldn't find the variable in the current scope
// If it really isn't defined, it will be caught by the undefined var error
return '';
}
$call = $scope[$current_scope]['vars'][$node->children[0]->children[0]]['type'];
// Hack - loop through the possible types of the var and assume first found class is correct
foreach (explode('|', nongenerics($call)) as $class_name) {
if (!empty($classes[strtolower($class_name)])) {
break;
}
}
if (empty($class_name)) {
return '';
}
$class_name = $classes[strtolower($class_name)]['name'] ?? $class_name;
}
} else {
if ($node->children[0]->kind == \ast\AST_PROP) {
$prop = $node->children[0];
if ($prop->children[0]->kind == \ast\AST_VAR && !$prop->children[0]->children[0] instanceof \ast\Node) {
// $var->prop->method()
$var = $prop->children[0];
if ($var->children[0] == 'this') {
if (!$current_class) {
Log::err(Log::ESTATIC, 'Using $this when not in object context', $file, $node->lineno);
return '';
}
if (!$prop->children[1] instanceof \ast\Node) {
if (!empty($current_class['properties'][$prop->children[1]])) {
$prop = $current_class['properties'][$prop->children[1]];
foreach (explode('|', nongenerics($prop['type'])) as $class_name) {
if (!empty($classes[strtolower($class_name)])) {
break;
}
}
if (empty($class_name)) {
return '';
}
$class_name = $classes[strtolower($class_name)]['name'] ?? $class_name;
}
} else {
// $this->$prop->method() - too dynamic, give up
return '';
}
}
}
}
}
break;
}
if ($class_name) {
$lc = strtolower($class_name);
switch ($node->kind) {
case \ast\AST_NEW:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "Trying to instantiate undeclared class {$class_name}", $file, $node->lineno);
}
} else {
if ($classes[$lc]['flags'] & \ast\flags\CLASS_ABSTRACT) {
if (!is_native_type(type_map($class_name))) {
if ($current_scope != 'global') {
list($scope_class, ) = explode('::', $current_scope);
} else {
$scope_class = '';
}
$lsc = strtolower($scope_class);
if ($lc != $lsc || $lc == $lsc && strtolower($current_class['name']) != $lsc) {
Log::err(Log::ETYPE, "Cannot instantiate abstract class {$class_name}", $file, $node->lineno);
}
}
} else {
if ($classes[$lc]['flags'] & \ast\flags\CLASS_INTERFACE) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::ETYPE, "Cannot instantiate interface {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
}
}
break;
case \ast\AST_INSTANCEOF:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "instanceof called on undeclared class {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
break;
case \ast\AST_CLASS_CONST:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "can't access constant from undeclared class {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
break;
case \ast\AST_STATIC_CALL:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "static call to undeclared class {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
break;
case \ast\AST_METHOD_CALL:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "call to method on undeclared class {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
break;
case \ast\AST_PROP:
if (empty($classes[$lc])) {
if (!is_native_type(type_map($class_name))) {
Log::err(Log::EUNDEF, "can't access property from undeclared class {$class_name}", $file, $node->lineno);
}
} else {
$return = $class_name;
}
break;
}
}
return $return;
}
function node_type($file, $namespace, $node, $current_scope, $current_class, &$taint = null, $check_var_exists = true)
{
global $classes, $functions, $scope, $namespace_map, $internal_arginfo;
if (!$node instanceof \ast\Node) {
if ($node === null) {
return '';
}
return type_map(gettype($node));
} else {
if ($node->kind == \ast\AST_ARRAY) {
if (!empty($node->children) && $node->children[0] instanceof \ast\Node && $node->children[0]->kind == \ast\AST_ARRAY_ELEM) {
// Check the first 5 (completely arbitrary) elements and assume the rest are the same type
$etypes = [];
for ($i = 0; $i < 5; $i++) {
if (empty($node->children[$i])) {
break;
}
if ($node->children[$i]->children[0] instanceof \ast\Node) {
$etypes[] = node_type($file, $namespace, $node->children[$i]->children[0], $current_scope, $current_class, $temp_taint);
} else {
$etypes[] = type_map(gettype($node->children[$i]->children[0]));
}
}
$types = array_unique($etypes);
if (count($types) == 1 && !empty($types[0])) {
return mkgenerics($types[0]);
}
}
return 'array';
} else {
if ($node->kind == \ast\AST_BINARY_OP || $node->kind == \ast\AST_GREATER || $node->kind == \ast\AST_GREATER_EQUAL) {
if ($node->kind == \ast\AST_BINARY_OP) {
$node_flags = $node->flags;
} else {
$node_flags = $node->kind;
}
$taint = var_taint_check($file, $node, $current_scope);
switch ($node_flags) {
// Always a string from a concat
case \ast\flags\BINARY_CONCAT:
$temp_taint = false;
node_type($file, $namespace, $node->children[0], $current_scope, $current_class, $temp_taint);
if ($temp_taint) {
$taint = true;
return 'string';
}
node_type($file, $namespace, $node->children[1], $current_scope, $current_class, $temp_taint);
if ($temp_taint) {
$taint = true;
}
return 'string';
break;
// Boolean unless invalid operands
// Boolean unless invalid operands
case \ast\flags\BINARY_IS_IDENTICAL:
case \ast\flags\BINARY_IS_NOT_IDENTICAL:
case \ast\flags\BINARY_IS_EQUAL:
case \ast\flags\BINARY_IS_NOT_EQUAL:
case \ast\flags\BINARY_IS_SMALLER:
case \ast\flags\BINARY_IS_SMALLER_OR_EQUAL:
case \ast\AST_GREATER:
case \ast\AST_GREATER_EQUAL:
$temp = node_type($file, $namespace, $node->children[0], $current_scope, $current_class);
if (!$temp) {
$left = '';
} else {
$left = type_map($temp);
}
$temp = node_type($file, $namespace, $node->children[1], $current_scope, $current_class);
if (!$temp) {
$right = '';
} else {
$right = type_map($temp);
}
$taint = false;
// If we have generics and no non-generics on the left and the right is not array-like ...
if (!empty(generics($left)) && empty(nongenerics($left)) && !type_check($right, 'array')) {
Log::err(Log::ETYPE, "array to {$right} comparison", $file, $node->lineno);
} else {
// and the same for the right side
if (!empty(generics($right)) && empty(nongenerics($right)) && !type_check($left, 'array')) {
Log::err(Log::ETYPE, "{$left} to array comparison", $file, $node->lineno);
}
}
return 'bool';
break;
// Add is special because you can add arrays
// Add is special because you can add arrays
case \ast\flags\BINARY_ADD:
$temp = node_type($file, $namespace, $node->children[0], $current_scope, $current_class);
if (!$temp) {
$left = '';
} else {
$left = type_map($temp);
}
$temp = node_type($file, $namespace, $node->children[1], $current_scope, $current_class);
if (!$temp) {
$right = '';
} else {
$right = type_map($temp);
}
// fast-track common cases
if ($left == 'int' && $right == 'int') {
return 'int';
}
if (($left == 'int' || $left == 'float') && ($right == 'int' || $right == 'float')) {
return 'float';
}
$left_is_array = !empty(generics($left)) && empty(nongenerics($left));
$right_is_array = !empty(generics($right)) && empty(nongenerics($right));
if ($left_is_array && !type_check($right, 'array')) {
Log::err(Log::ETYPE, "invalid operator: left operand is array and right is not", $file, $node->lineno);
return '';
} else {
if ($right_is_array && !type_check($left, 'array')) {
Log::err(Log::ETYPE, "invalid operator: right operand is array and left is not", $file, $node->lineno);
return '';
} else {
if ($left_is_array || $right_is_array) {
// If it is a '+' and we know one side is an array and the other is unknown, assume array
return 'array';
}
}
}
return 'int|float';
$taint = false;
break;
// Everything else should be an int/float
// Everything else should be an int/float
default:
$temp = node_type($file, $namespace, $node->children[0], $current_scope, $current_class);
if (!$temp) {
$left = '';
} else {
$left = type_map($temp);
}
$temp = node_type($file, $namespace, $node->children[1], $current_scope, $current_class);
if (!$temp) {
$right = '';
} else {
$right = type_map($temp);
}
if ($left == 'array' || $right == 'array') {
Log::err(Log::ETYPE, "invalid array operator", $file, $node->lineno);
return '';
} else {
if ($left == 'int' && $right == 'int') {
return 'int';
} else {
if ($left == 'float' || $right == 'float') {
return 'float';
}
}
}
return 'int|float';
$taint = false;
break;
}
} else {
if ($node->kind == \ast\AST_CAST) {
$taint = var_taint_check($file, $node->children[0], $current_scope);
switch ($node->flags) {
case \ast\flags\TYPE_NULL:
return 'null';
break;
case \ast\flags\TYPE_BOOL:
$taint = false;
return 'bool';
break;
case \ast\flags\TYPE_LONG:
$taint = false;
return 'int';
break;
case \ast\flags\TYPE_DOUBLE:
$taint = false;
return 'float';
break;
case \ast\flags\TYPE_STRING:
return 'string';
break;
case \ast\flags\TYPE_ARRAY:
return 'array';
break;
case \ast\flags\TYPE_OBJECT:
return 'object';
break;
default:
Log::err(Log::EFATAL, "Unknown type (" . $node->flags . ") in cast");
}
} else {
if ($node->kind == \ast\AST_NEW) {
$class_name = find_class_name($file, $node, $namespace, $current_class, $current_scope);
if ($class_name) {
return $classes[strtolower($class_name)]['type'];
}
return 'object';
} else {
if ($node->kind == \ast\AST_DIM) {
$taint = var_taint_check($file, $node->children[0], $current_scope);
$type = node_type($file, $namespace, $node->children[0], $current_scope, $current_class);
if (!empty($type)) {
$gen = generics($type);
if (empty($gen)) {
if ($type !== 'null' && !type_check($type, 'string|ArrayAccess')) {
// array offsets work on strings, unfortunately
// Double check that any classes in the type don't have ArrayAccess
$ok = false;
foreach (explode('|', $type) as $t) {
if (!empty($t) && !is_native_type($t)) {
if (!empty($classes[strtolower($t)]['type'])) {
if (strpos('|' . $classes[strtolower($t)]['type'] . '|', '|ArrayAccess|') !== false) {
$ok = true;
break;
}
}
}
}
if (!$ok) {
Log::err(Log::ETYPE, "Suspicious array access to {$type}", $file, $node->lineno);
}
}
return '';
}
} else {
return '';
}
return $gen;
} else {
if ($node->kind == \ast\AST_VAR) {
return var_type($file, $node, $current_scope, $taint, $check_var_exists);
} else {
if ($node->kind == \ast\AST_ENCAPS_LIST) {
foreach ($node->children as $encap) {
if ($encap instanceof \ast\Node) {
if (var_taint_check($file, $encap, $current_scope)) {
$taint = true;
}
}
}
return "string";
} else {
if ($node->kind == \ast\AST_CONST) {
if ($node->children[0]->kind == \ast\AST_NAME) {
if (defined($node->children[0]->children[0])) {
return type_map(gettype(constant($node->children[0]->children[0])));
} else {
// Todo: user-defined constant
}
}
} else {
if ($node->kind == \ast\AST_CLASS_CONST) {
if ($node->children[1] == 'class') {
return 'string';
}
// class name fetch
$class_name = find_class_name($file, $node, $namespace, $current_class, $current_scope);
if (!$class_name) {
return '';
}
$ltemp = strtolower($class_name);
while ($ltemp && !array_key_exists($node->children[1], $classes[$ltemp]['constants'])) {
$ltemp = strtolower($classes[$ltemp]['parent']);
if (empty($classes[$ltemp])) {
return '';
}
// undeclared class - will be caught elsewhere
}
if (!$ltemp || !array_key_exists($node->children[1], $classes[$ltemp]['constants'])) {
Log::err(Log::EUNDEF, "can't access undeclared constant {$class_name}::{$node->children[1]}", $file, $node->lineno);
return '';
}
return $classes[$ltemp]['constants'][$node->children[1]]['type'];
} else {
if ($node->kind == \ast\AST_PROP) {
if ($node->children[0]->kind == \ast\AST_VAR) {
$class_name = find_class_name($file, $node, $namespace, $current_class, $current_scope);
if ($class_name && !$node->children[1] instanceof \ast\Node) {
$ltemp = find_property($file, $node, $class_name, $node->children[1], $class_name, false);
if (empty($ltemp)) {
return '';
}
return $classes[$ltemp]['properties'][$node->children[1]]['type'];
}
}
} else {
if ($node->kind == \ast\AST_STATIC_PROP) {
if ($node->children[0]->kind == \ast\AST_NAME) {
$class_name = qualified_name($file, $node->children[0], $namespace);
if ($class_name && !$node->children[1] instanceof \ast\Node) {
$ltemp = find_property($file, $node, $class_name, $node->children[1], $class_name, false);
if (empty($ltemp)) {
return '';
}
return $classes[$ltemp]['properties'][$node->children[1]]['type'];
}
}
} else {
if ($node->kind == \ast\AST_CALL) {
if ($node->children[0]->kind == \ast\AST_NAME) {
$func_name = $node->children[0]->children[0];
if ($node->children[0]->flags & \ast\flags\NAME_NOT_FQ) {
$func = $namespace_map[T_FUNCTION][$file][strtolower($namespace . $func_name)] ?? $namespace_map[T_FUNCTION][$file][strtolower($func_name)] ?? $functions[strtolower($namespace . $func_name)] ?? $functions[strtolower($func_name)] ?? null;
} else {
$func = $functions[strtolower($func_name)] ?? null;
}
if ($func['file'] == 'internal' && empty($func['ret'])) {
if (!empty($internal_arginfo[$func_name])) {
return $internal_arginfo[$func_name][0] ?? '';
}
} else {
return $func['ret'] ?? '';
}
} else {
// TODO: Handle $func() and other cases that get here
}
} else {
if ($node->kind == \ast\AST_STATIC_CALL) {
$class_name = find_class_name($file, $node, $namespace, $current_class, $current_scope);
$method = find_method($class_name, $node->children[1]);
if ($method) {
return $method['ret'] ?? '';
}
} else {
if ($node->kind == \ast\AST_METHOD_CALL) {
$class_name = find_class_name($file, $node, $namespace, $current_class, $current_scope);
if ($class_name) {
$method_name = $node->children[1];
$method = find_method($class_name, $method_name);
if ($method === false) {
Log::err(Log::EUNDEF, "call to undeclared method {$class_name}->{$method_name}()", $file, $node->lineno);
} else {
if ($method != 'dynamic') {
return $method['ret'];
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
return '';
}