108 lines
3.2 KiB
C#
108 lines
3.2 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 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.CryptoObfuscator {
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class ResourceResolver {
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ModuleDefinition module;
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ResourceDecrypter resourceDecrypter;
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TypeDefinition resolverType;
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MethodDefinition resolverMethod;
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bool mergedIt = false;
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public TypeDefinition Type {
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get { return resolverType; }
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}
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public MethodDefinition Method {
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get { return resolverMethod; }
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}
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public ResourceResolver(ModuleDefinition module, ResourceDecrypter resourceDecrypter) {
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this.module = module;
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this.resourceDecrypter = resourceDecrypter;
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}
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public void find() {
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var cctor = DotNetUtils.getMethod(DotNetUtils.getModuleType(module), ".cctor");
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if (cctor == null)
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return;
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foreach (var tuple in DotNetUtils.getCalledMethods(module, cctor)) {
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var method = tuple.Item2;
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if (method.Name == ".cctor" || method.Name == ".ctor")
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continue;
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if (!method.IsStatic || !DotNetUtils.isMethod(method, "System.Void", "()"))
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continue;
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if (checkType(tuple.Item1, method))
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break;
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}
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}
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public EmbeddedResource mergeResources() {
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if (mergedIt)
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return null;
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var resource = DotNetUtils.getResource(module, module.Assembly.Name.Name) as EmbeddedResource;
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if (resource == null)
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return null;
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DeobUtils.decryptAndAddResources(module, resource.Name, () => resourceDecrypter.decrypt(resource.GetResourceStream()));
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mergedIt = true;
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return resource;
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}
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bool checkType(TypeDefinition type, MethodDefinition initMethod) {
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if (!initMethod.HasBody)
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return false;
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if (DotNetUtils.findFieldType(type, "System.Reflection.Assembly", true) == null)
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return false;
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var instructions = initMethod.Body.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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var instrs = DotNetUtils.getInstructions(instructions, i, OpCodes.Ldnull, OpCodes.Ldftn, OpCodes.Newobj);
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if (instrs == null)
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continue;
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MethodReference methodRef;
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var ldftn = instrs[1];
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var newobj = instrs[2];
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methodRef = ldftn.Operand as MethodReference;
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if (methodRef == null || !MemberReferenceHelper.compareTypes(type, methodRef.DeclaringType))
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continue;
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methodRef = newobj.Operand as MethodReference;
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if (methodRef == null || methodRef.FullName != "System.Void System.ResolveEventHandler::.ctor(System.Object,System.IntPtr)")
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continue;
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resolverType = type;
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resolverMethod = initMethod;
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return true;
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}
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return false;
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}
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}
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}
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