137 lines
3.7 KiB
C#
137 lines
3.7 KiB
C#
using System;
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using dot10.IO;
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using dot10.PE;
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using dot10.DotNet.MD;
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namespace de4dot.code.deobfuscators.dotNET_Reactor {
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sealed class MyPEImage : IDisposable {
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IPEImage peImage;
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byte[] peImageData;
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IImageStream peStream;
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DotNetFile dnFile;
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ImageSectionHeader dotNetSection;
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bool ownPeImage;
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public IPEImage PEImage {
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get { return peImage; }
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}
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public uint Length {
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get { return (uint)peStream.Length; }
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}
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public MyPEImage(IPEImage peImage) {
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initialize(peImage);
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}
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public MyPEImage(byte[] peImageData) {
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this.ownPeImage = true;
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this.peImageData = peImageData;
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initialize(new PEImage(peImageData));
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}
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void initialize(IPEImage peImage) {
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this.peImage = peImage;
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this.peStream = peImage.CreateFullStream();
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//TODO: Only init this if they use the .NET MD
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var dotNetDir = peImage.ImageNTHeaders.OptionalHeader.DataDirectories[14];
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if (dotNetDir.VirtualAddress != 0 && dotNetDir.Size >= 0x48) {
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dnFile = DotNetFile.Load(peImage, false);
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dotNetSection = findSection(dotNetDir.VirtualAddress);
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}
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}
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ImageSectionHeader findSection(RVA rva) {
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foreach (var section in peImage.ImageSectionHeaders) {
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if (section.VirtualAddress <= rva && rva < section.VirtualAddress + Math.Max(section.VirtualSize, section.SizeOfRawData))
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return section;
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}
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return null;
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}
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static bool isInside(ImageSectionHeader section, uint offset, uint length) {
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return offset >= section.PointerToRawData && offset + length <= section.PointerToRawData + section.SizeOfRawData;
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}
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public void offsetWriteUInt32(uint offset, uint val) {
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peImageData[offset + 0] = (byte)val;
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peImageData[offset + 1] = (byte)(val >> 8);
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peImageData[offset + 2] = (byte)(val >> 16);
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peImageData[offset + 3] = (byte)(val >> 24);
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}
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public void offsetWriteUInt16(uint offset, ushort val) {
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peImageData[offset + 0] = (byte)val;
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peImageData[offset + 1] = (byte)(val >> 8);
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}
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public uint offsetReadUInt32(uint offset) {
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peStream.Position = offset;
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return peStream.ReadUInt32();
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}
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public ushort offsetReadUInt16(uint offset) {
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peStream.Position = offset;
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return peStream.ReadUInt16();
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}
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public byte offsetReadByte(uint offset) {
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peStream.Position = offset;
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return peStream.ReadByte();
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}
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public byte[] offsetReadBytes(uint offset, int size) {
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peStream.Position = offset;
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return peStream.ReadBytes(size);
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}
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public void offsetWrite(uint offset, byte[] data) {
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Array.Copy(data, 0, peImageData, offset, data.Length);
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}
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bool intersect(uint offset1, uint length1, uint offset2, uint length2) {
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return !(offset1 + length1 <= offset2 || offset2 + length2 <= offset1);
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}
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bool intersect(uint offset, uint length, IFileSection location) {
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return intersect(offset, length, (uint)location.StartOffset, (uint)(location.EndOffset - location.StartOffset));
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}
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public bool dotNetSafeWriteOffset(uint offset, byte[] data) {
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if (dnFile != null) {
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uint length = (uint)data.Length;
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if (!isInside(dotNetSection, offset, length))
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return false;
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if (intersect(offset, length, dnFile.MetaData.ImageCor20Header))
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return false;
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if (intersect(offset, length, (uint)dnFile.MetaData.TablesStream.FileOffset, dnFile.MetaData.TablesStream.HeaderLength))
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return false;
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}
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offsetWrite(offset, data);
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return true;
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}
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public bool dotNetSafeWrite(uint rva, byte[] data) {
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return dotNetSafeWriteOffset((uint)peImage.ToFileOffset((RVA)rva), data);
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}
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public void Dispose() {
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if (ownPeImage) {
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if (dnFile != null)
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dnFile.Dispose();
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if (peImage != null)
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peImage.Dispose();
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}
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if (peStream != null)
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peStream.Dispose();
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dnFile = null;
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peImage = null;
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peStream = null;
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}
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}
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}
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