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