90 lines
3.0 KiB
C#
90 lines
3.0 KiB
C#
/*
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Copyright (C) 2011-2012 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.CliSecure {
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class ProxyCallFixer : ProxyCallFixer1 {
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IList<MemberReference> memberReferences;
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public ProxyCallFixer(ModuleDefinition module)
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: base(module) {
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}
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public ProxyCallFixer(ModuleDefinition module, ProxyCallFixer oldOne)
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: base(module) {
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foreach (var method in oldOne.delegateCreatorMethods)
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setDelegateCreatorMethod(lookup(method, "Could not find delegate creator method"));
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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 methodName = "System.Void " + type.FullName + "::icgd(System.Int32)";
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foreach (var method in type.Methods) {
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if (method.FullName == methodName) {
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setDelegateCreatorMethod(method);
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return;
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}
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}
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}
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}
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protected override object checkCctor(ref TypeDefinition type, MethodDefinition cctor) {
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var instrs = cctor.Body.Instructions;
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if (instrs.Count != 3)
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return null;
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if (!DotNetUtils.isLdcI4(instrs[0].OpCode.Code))
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return null;
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if (instrs[1].OpCode != OpCodes.Call || !isDelegateCreatorMethod(instrs[1].Operand as MethodDefinition))
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return null;
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if (instrs[2].OpCode != OpCodes.Ret)
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return null;
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int delegateToken = 0x02000001 + DotNetUtils.getLdcI4Value(instrs[0]);
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if (type.MetadataToken.ToInt32() != delegateToken) {
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Log.w("Delegate token is not current type");
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return null;
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}
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return new object();
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}
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protected override void getCallInfo(object context, FieldDefinition field, out MethodReference calledMethod, out OpCode callOpcode) {
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if (memberReferences == null)
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memberReferences = new List<MemberReference>(module.GetMemberReferences());
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var name = field.Name;
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callOpcode = OpCodes.Call;
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if (name.EndsWith("%", StringComparison.Ordinal)) {
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callOpcode = OpCodes.Callvirt;
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name = name.TrimEnd(new char[] { '%' });
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}
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byte[] value = Convert.FromBase64String(name);
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int methodIndex = BitConverter.ToInt32(value, 0); // 0-based memberRef index
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if (methodIndex >= memberReferences.Count)
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throw new ApplicationException(string.Format("methodIndex ({0}) >= memberReferences.Count ({1})", methodIndex, memberReferences.Count));
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calledMethod = memberReferences[methodIndex] as MethodReference;
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}
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}
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}
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