109 lines
3.1 KiB
C#
109 lines
3.1 KiB
C#
/*
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Copyright (C) 2011-2015 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 dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v4 {
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class ProxyCallFixer : ProxyCallFixer3 {
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ISimpleDeobfuscator simpleDeobfuscator;
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public ProxyCallFixer(ModuleDefMD module, ISimpleDeobfuscator simpleDeobfuscator)
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: base(module) {
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this.simpleDeobfuscator = simpleDeobfuscator;
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}
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public void FindDelegateCreator() {
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foreach (var type in module.Types) {
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var creatorMethod = CheckType(type);
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if (creatorMethod == null)
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continue;
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SetDelegateCreatorMethod(creatorMethod);
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return;
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}
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}
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static readonly string[] requiredFields = new string[] {
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"System.Reflection.Module",
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};
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static MethodDef CheckType(TypeDef type) {
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if (!new FieldTypes(type).Exactly(requiredFields))
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return null;
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if (type.FindStaticConstructor() == null)
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return null;
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return CheckMethods(type);
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}
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static MethodDef CheckMethods(TypeDef type) {
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MethodDef creatorMethod = null;
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foreach (var method in type.Methods) {
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if (method.Body == null)
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return null;
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if (method.Name == ".cctor" || method.Name == ".ctor")
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continue;
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if (!DotNetUtils.IsMethod(method, "System.Void", "(System.Int32)"))
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return null;
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if (!DeobUtils.HasInteger(method, 0x02000000))
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return null;
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if (!DeobUtils.HasInteger(method, 0x06000000))
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return null;
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creatorMethod = method;
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}
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return creatorMethod;
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}
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protected override object CheckCctor(ref TypeDef type, MethodDef cctor) {
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simpleDeobfuscator.Deobfuscate(cctor);
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var realType = GetDelegateType(cctor);
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if (realType == null)
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return null;
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type = realType;
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return this;
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}
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TypeDef GetDelegateType(MethodDef method) {
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var instrs = method.Body.Instructions;
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for (int i = 0; i < instrs.Count - 1; i++) {
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var ldci4 = instrs[i];
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if (!ldci4.IsLdcI4())
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continue;
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var call = instrs[i + 1];
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if (call.OpCode.Code != Code.Call)
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continue;
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var calledMethod = call.Operand as MethodDef;
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if (calledMethod == null || !IsDelegateCreatorMethod(calledMethod))
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continue;
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return module.ResolveToken(0x02000000 + ldci4.GetLdcI4Value()) as TypeDef;
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}
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return null;
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}
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protected override void GetCallInfo(object context, FieldDef field, out IMethod calledMethod, out OpCode callOpcode) {
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calledMethod = module.ResolveToken(0x06000000 + field.MDToken.ToInt32()) as IMethod;
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callOpcode = OpCodes.Call;
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}
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}
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}
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