291 lines
8.5 KiB
C#
291 lines
8.5 KiB
C#
/*
|
|
Copyright (C) 2011 de4dot@gmail.com
|
|
|
|
This file is part of de4dot.
|
|
|
|
de4dot is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
de4dot is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using Mono.Cecil;
|
|
using Mono.Cecil.Cil;
|
|
using de4dot.blocks;
|
|
|
|
namespace de4dot.code.deobfuscators.SmartAssembly {
|
|
class AutomatedErrorReportingFinder {
|
|
ModuleDefinition module;
|
|
ExceptionLoggerRemover exceptionLoggerRemover = new ExceptionLoggerRemover();
|
|
TypeDefinition automatedErrorReportingType;
|
|
int constantArgs;
|
|
AerVersion aerVersion;
|
|
|
|
enum AerVersion {
|
|
V0,
|
|
V1,
|
|
V2,
|
|
V3,
|
|
}
|
|
|
|
public ExceptionLoggerRemover ExceptionLoggerRemover {
|
|
get { return exceptionLoggerRemover; }
|
|
}
|
|
|
|
public TypeDefinition Type {
|
|
get { return automatedErrorReportingType; }
|
|
}
|
|
|
|
public bool Detected {
|
|
get { return automatedErrorReportingType != null; }
|
|
}
|
|
|
|
public AutomatedErrorReportingFinder(ModuleDefinition module) {
|
|
this.module = module;
|
|
}
|
|
|
|
public void find() {
|
|
foreach (var type in module.Types) {
|
|
if (detectAutomatedErrorReportingType(type))
|
|
break;
|
|
}
|
|
}
|
|
|
|
bool detectAutomatedErrorReportingType(TypeDefinition type) {
|
|
if (automatedErrorReportingType != null)
|
|
return false;
|
|
|
|
const int MIN_HELPER_METHODS = 6;
|
|
|
|
constantArgs = 0;
|
|
var methods = new List<MethodDefinition>();
|
|
MethodDefinition mainMethod = null;
|
|
foreach (var method in type.Methods) {
|
|
if (isAutomatedErrorReportingMethodHelper(method))
|
|
methods.Add(method);
|
|
else if (isAutomatedErrorReportingMethod(method))
|
|
mainMethod = method;
|
|
else
|
|
continue;
|
|
initializeConstantArgs(method);
|
|
}
|
|
if (mainMethod == null)
|
|
return false;
|
|
|
|
if (isV0(type)) {
|
|
aerVersion = AerVersion.V0;
|
|
foreach (var method in type.Methods) {
|
|
if (method.IsStatic)
|
|
exceptionLoggerRemover.add(method);
|
|
}
|
|
}
|
|
else {
|
|
if (methods.Count < MIN_HELPER_METHODS)
|
|
return false;
|
|
|
|
if (isV1(mainMethod))
|
|
aerVersion = AerVersion.V1;
|
|
else if (isV2(mainMethod))
|
|
aerVersion = AerVersion.V2;
|
|
else
|
|
aerVersion = AerVersion.V3;
|
|
|
|
methods.Sort((a, b) => Utils.compareInt32(a.Parameters.Count, b.Parameters.Count));
|
|
for (int i = 0; i < methods.Count; i++) {
|
|
var method = methods[i];
|
|
if (method.Parameters.Count != i + constantArgs)
|
|
return false;
|
|
var methodCalls = DotNetUtils.getMethodCallCounts(method);
|
|
if (methodCalls.count(mainMethod.FullName) != 1)
|
|
return false;
|
|
}
|
|
}
|
|
|
|
exceptionLoggerRemover.add(mainMethod);
|
|
foreach (var method in methods)
|
|
exceptionLoggerRemover.add(method);
|
|
automatedErrorReportingType = type;
|
|
|
|
if (aerVersion == AerVersion.V1) {
|
|
foreach (var method in type.Methods) {
|
|
if (DotNetUtils.isMethod(method, "System.Exception", "(System.Int32,System.Object[])"))
|
|
exceptionLoggerRemover.add(method);
|
|
}
|
|
}
|
|
|
|
initUnhandledExceptionFilterMethods();
|
|
|
|
return true;
|
|
}
|
|
|
|
void initializeConstantArgs(MethodDefinition method) {
|
|
if (constantArgs > 0)
|
|
return;
|
|
constantArgs = getConstantArgs(method);
|
|
}
|
|
|
|
static int getConstantArgs(MethodDefinition method) {
|
|
if (method.Parameters.Count >= 2) {
|
|
if (isV1(method) || isV2(method))
|
|
return 2;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static string[] v0Fields = new string[] {
|
|
"System.Int32",
|
|
"System.Object[]",
|
|
};
|
|
static bool isV0(TypeDefinition type) {
|
|
if (!new FieldTypes(type).exactly(v0Fields))
|
|
return false;
|
|
if (type.Methods.Count != 3)
|
|
return false;
|
|
if (type.HasEvents || type.HasProperties)
|
|
return false;
|
|
MethodDefinition ctor = null, meth1 = null, meth2 = null;
|
|
foreach (var method in type.Methods) {
|
|
if (method.Name == ".ctor") {
|
|
ctor = method;
|
|
continue;
|
|
}
|
|
if (!method.IsStatic)
|
|
return false;
|
|
if (DotNetUtils.isMethod(method, "System.Exception", "(System.Int32,System.Object[])"))
|
|
meth1 = method;
|
|
else if (DotNetUtils.isMethod(method, "System.Exception", "(System.Int32,System.Exception,System.Object[])"))
|
|
meth2 = method;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
return ctor != null && meth1 != null && meth2 != null;
|
|
}
|
|
|
|
static bool isV1(MethodDefinition method) {
|
|
if (method.Parameters.Count < 2)
|
|
return false;
|
|
var p0 = method.Parameters[0].ParameterType.FullName;
|
|
var p1 = method.Parameters[1].ParameterType.FullName;
|
|
return p0 == "System.Int32" && p1 == "System.Exception";
|
|
}
|
|
|
|
static bool isV2(MethodDefinition method) {
|
|
if (method.Parameters.Count < 2)
|
|
return false;
|
|
var p0 = method.Parameters[0].ParameterType.FullName;
|
|
var p1 = method.Parameters[1].ParameterType.FullName;
|
|
return p0 == "System.Exception" && p1 == "System.Int32";
|
|
}
|
|
|
|
bool isAutomatedErrorReportingMethodHelper(MethodDefinition method) {
|
|
if (!method.HasBody || !method.IsStatic || method.Name == ".ctor")
|
|
return false;
|
|
if (DotNetUtils.hasReturnValue(method) && method.MethodReturnType.ReturnType.FullName != "System.Exception")
|
|
return false;
|
|
if (method.Parameters.Count == 0)
|
|
return false;
|
|
if (!isV1(method) && !isV2(method) && method.Parameters[0].ParameterType.FullName != "System.Exception")
|
|
return false;
|
|
for (int i = getConstantArgs(method); i < method.Parameters.Count; i++) {
|
|
if (method.Parameters[i].ParameterType.FullName != "System.Object")
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool isAutomatedErrorReportingMethod(MethodDefinition method) {
|
|
if (!method.HasBody || !method.IsStatic || method.Name == ".ctor")
|
|
return false;
|
|
return
|
|
// 5.x-6.x
|
|
DotNetUtils.isMethod(method, "System.Void", "(System.Exception,System.Object[])") ||
|
|
// 5.x-6.x
|
|
DotNetUtils.isMethod(method, "System.Void", "(System.Exception,System.Int32,System.Object[])") ||
|
|
// 3.x-4.x
|
|
DotNetUtils.isMethod(method, "System.Exception", "(System.Exception,System.Object[])") ||
|
|
// 2.x-4.x
|
|
DotNetUtils.isMethod(method, "System.Exception", "(System.Exception,System.Int32,System.Object[])") ||
|
|
// 1.x
|
|
DotNetUtils.isMethod(method, "System.Exception", "(System.Int32,System.Exception,System.Object[])");
|
|
}
|
|
|
|
void initUnhandledExceptionFilterMethods() {
|
|
var main = module.EntryPoint;
|
|
if (main == null || !main.HasBody)
|
|
return;
|
|
if (!main.Body.HasExceptionHandlers)
|
|
return;
|
|
|
|
MethodDefinition mainExceptionHandlerMethod = null;
|
|
var instructions = main.Body.Instructions;
|
|
for (int i = 0; i < instructions.Count; i++) {
|
|
var call = instructions[i];
|
|
if (call.OpCode != OpCodes.Call)
|
|
continue;
|
|
var method = getMainExceptionHandlerMethod(call.Operand as MethodReference);
|
|
if (method == null)
|
|
continue;
|
|
|
|
mainExceptionHandlerMethod = method; // Use the last one we find
|
|
}
|
|
|
|
if (mainExceptionHandlerMethod != null)
|
|
exceptionLoggerRemover.add(mainExceptionHandlerMethod);
|
|
}
|
|
|
|
MethodDefinition getMainExceptionHandlerMethod(MethodReference methodReference) {
|
|
var type = DotNetUtils.getType(module, methodReference.DeclaringType);
|
|
var method = DotNetUtils.getMethod(type, methodReference);
|
|
if (method == null || !method.IsStatic)
|
|
return null;
|
|
|
|
if (DotNetUtils.hasReturnValue(method))
|
|
return null;
|
|
|
|
switch (aerVersion) {
|
|
case AerVersion.V0:
|
|
case AerVersion.V1:
|
|
if (!DotNetUtils.isMethod(method, "System.Void", "(System.Int32,System.Object[])"))
|
|
return null;
|
|
break;
|
|
|
|
case AerVersion.V2:
|
|
if (method.Parameters.Count < 2)
|
|
return null;
|
|
if (method.Parameters[0].ParameterType.ToString() != "System.Exception")
|
|
return null;
|
|
if (method.Parameters[1].ParameterType.ToString() != "System.Int32")
|
|
return null;
|
|
if (method.Parameters[method.Parameters.Count - 1].ParameterType.ToString() != "System.Object[]")
|
|
return null;
|
|
break;
|
|
|
|
case AerVersion.V3:
|
|
if (method.Parameters.Count < 1)
|
|
return null;
|
|
if (method.Parameters[0].ParameterType.ToString() != "System.Exception")
|
|
return null;
|
|
if (method.Parameters[method.Parameters.Count - 1].ParameterType.ToString() != "System.Object[]")
|
|
return null;
|
|
break;
|
|
|
|
default:
|
|
throw new ApplicationException("Invalid AER version");
|
|
}
|
|
|
|
return method;
|
|
}
|
|
}
|
|
}
|