/// <summary>
/// Creates an object a initialize default with defualt fields.
/// </summary>
/// <param name="flow">FlowController</param>
/// <param name="type">Type to resolve</param>
/// <returns>ObjectValue</returns>
private static Value CreateObject(FlowController flow, string type)
{
var objectAnalyzer = NativeObjectAnalyzer.GetInstance(flow.OutSet);
QualifiedName typeName = new QualifiedName(new Name(type));
if (objectAnalyzer.ExistClass(typeName))
{
ClassDecl decl = objectAnalyzer.GetClass(typeName);
var fields = objectAnalyzer.GetClass(typeName).Fields;
ObjectValue value = flow.OutSet.CreateObject(flow.OutSet.CreateType(decl));
var newObject = flow.OutSet.GetLocalControlVariable(new VariableName(".tmpObject" + type));
newObject.WriteMemory(flow.OutSet.Snapshot, new MemoryEntry(value));
if (value is ObjectValue)
{
foreach (FieldInfo field in fields.Values)
{
if (field.IsStatic == false)
{
var newField = newObject.ReadField(flow.OutSet.Snapshot, new VariableIdentifier(field.Name.Value));
try {
newField.WriteMemory(flow.OutSet.Snapshot, NativeAnalyzerUtils.ResolveReturnValue(field.Type, flow));
} catch (Exception) {}
}
}
}
return(value);
}
else
{
return(flow.OutSet.AnyObjectValue);
}
}
/// <summary>
/// Return singleton instance of NativeObjectAnalyzer
/// </summary>
/// <param name="outSet">FlowOutputSet</param>
/// <returns>singleton instance of NativeObjectAnalyzer</returns>
public static NativeObjectAnalyzer GetInstance(FlowOutputSet outSet)
{
if (instance == null)
{
instance = new NativeObjectAnalyzer(outSet);
}
return(instance);
}
/// <summary>
/// Models constructor of native object
/// </summary>
/// <param name="flow">FlowController</param>
public void initObject(FlowController flow)
{
var nativeClass = NativeObjectAnalyzer.GetInstance(flow.OutSet).GetClass(ObjectName);
var fields = nativeClass.Fields;
var thisVariable = flow.OutSet.GetVariable(new VariableIdentifier("this"));
List <Value> inputValues = new List <Value>();
foreach (var argument in getArguments(flow))
{
inputValues.AddRange(argument.PossibleValues);
}
MethodIdentifier methodIdentifier = new MethodIdentifier(ObjectName, Method.Name.Name);
if (NativeObjectAnalyzer.ReportingFunctions.ContainsKey(methodIdentifier))
{
foreach (var flag in NativeObjectAnalyzer.ReportingFunctions[methodIdentifier])
{
if (FlagsHandler.IsDirty(inputValues, flag))
{
AnalysisWarningHandler.SetWarning(flow.OutSet, new AnalysisSecurityWarning(NativeAnalyzerUtils.GetCallerScript(flow.OutSet), flow.CurrentPartial, flow.CurrentProgramPoint, flag, methodIdentifier.Name.ToString()));
break;
}
}
}
foreach (FieldInfo field in fields.Values)
{
if (field.IsStatic == false)
{
MemoryEntry fieldValues = NativeAnalyzerUtils.ResolveReturnValue(field.Type, flow);
fieldValues = new MemoryEntry(FlagsHandler.CopyFlags(inputValues, fieldValues.PossibleValues));
var fieldEntry = thisVariable.ReadField(flow.OutSet.Snapshot, new VariableIdentifier(field.Name.Value));
fieldEntry.WriteMemory(flow.OutSet.Snapshot, fieldValues);
}
}
}
/// <summary>
/// Models a called method.
/// </summary>
/// <param name="flow"></param>
public void Analyze(FlowController flow)
{
if (NativeAnalyzerUtils.checkArgumentsCount(flow, Method))
{
NativeAnalyzerUtils.checkArgumentTypes(flow, Method);
}
MethodIdentifier methodIdentifier = new MethodIdentifier(ObjectName, Method.Name.Name);
var nativeClass = NativeObjectAnalyzer.GetInstance(flow.OutSet).GetClass(ObjectName);
var fields = nativeClass.Fields;
var functionResult = NativeAnalyzerUtils.ResolveReturnValue(Method.ReturnType, flow);
var arguments = getArguments(flow);
var thisVariable = flow.OutSet.GetVariable(new VariableIdentifier("this"));
List <Value> inputValues = new List <Value>();
bool isStaticCall = false;
if (thisVariable.ReadMemory(flow.OutSet.Snapshot).PossibleValues.Count() == 1 && thisVariable.ReadMemory(flow.OutSet.Snapshot).PossibleValues.First() is UndefinedValue)
{
isStaticCall = true;
var fieldsEntries = new List <MemoryEntry>();
foreach (FieldInfo field in fields.Values)
{
var fieldEntry = thisVariable.ReadField(flow.OutSet.Snapshot, new VariableIdentifier(field.Name.Value));
fieldsEntries.Add(fieldEntry.ReadMemory(flow.OutSet.Snapshot));
inputValues.AddRange(fieldEntry.ReadMemory(flow.OutSet.Snapshot).PossibleValues);
}
fieldsEntries.AddRange(arguments);
foreach (FieldInfo field in fields.Values)
{
var fieldEntry = thisVariable.ReadField(flow.OutSet.Snapshot, new VariableIdentifier(field.Name.Value));
MemoryEntry newfieldValues = NativeAnalyzerUtils.ResolveReturnValue(field.Type, flow);
newfieldValues = new MemoryEntry(FlagsHandler.CopyFlags(inputValues, newfieldValues.PossibleValues));
HashSet <Value> newValues = new HashSet <Value>((fieldEntry.ReadMemory(flow.OutSet.Snapshot)).PossibleValues);
foreach (var newValue in newfieldValues.PossibleValues)
{
newValues.Add(newValue);
}
thisVariable.ReadField(flow.OutSet.Snapshot, new VariableIdentifier(field.Name.Value)).WriteMemory(flow.OutSet.Snapshot, new MemoryEntry(newValues));
}
}
foreach (var argument in arguments)
{
inputValues.AddRange(argument.PossibleValues);
}
if (NativeObjectAnalyzer.ReportingFunctions.ContainsKey(methodIdentifier))
{
foreach (var flag in NativeObjectAnalyzer.ReportingFunctions[methodIdentifier])
{
if (FlagsHandler.IsDirty(inputValues, flag))
{
AnalysisWarningHandler.SetWarning(flow.OutSet, new AnalysisSecurityWarning(NativeAnalyzerUtils.GetCallerScript(flow.OutSet), flow.CurrentPartial, flow.CurrentProgramPoint, flag, methodIdentifier.Name.ToString()));
break;
}
}
}
if (isStaticCall == true)
{
thisVariable.WriteMemory(flow.OutSet.Snapshot, new MemoryEntry(FlagsHandler.CopyFlags(inputValues, thisVariable.ReadMemory(flow.OutSet.Snapshot).PossibleValues)));
}
functionResult = new MemoryEntry(FlagsHandler.CopyFlags(inputValues, functionResult.PossibleValues));
if (NativeObjectAnalyzer.CleaningFunctions.ContainsKey(methodIdentifier))
{
foreach (var flag in NativeObjectAnalyzer.CleaningFunctions[methodIdentifier])
{
functionResult = new MemoryEntry(FlagsHandler.Clean(functionResult.PossibleValues, flag));
}
}
flow.OutSet.GetLocalControlVariable(SnapshotBase.ReturnValue).WriteMemory(flow.OutSet.Snapshot, functionResult);
var assigned_aliases = NativeAnalyzerUtils.ResolveAliasArguments(flow, inputValues, (new NativeFunction[1] {
Method
}).ToList());
}
