mirror of
https://github.com/SabreTools/BinaryObjectScanner.git
synced 2026-02-14 05:36:07 +00:00
1532 lines
70 KiB
C#
1532 lines
70 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using BurnOutSharp.Models.PortableExecutable;
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namespace BurnOutSharp.Builder
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{
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// TODO: Make Stream Data rely on Byte Data
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public static class PortableExecutable
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{
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#region Byte Data
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/// <summary>
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/// Parse a byte array into a Portable Executable
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/// </summary>
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/// <param name="data">Byte array to parse</param>
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/// <param name="offset">Offset into the byte array</param>
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/// <returns>Filled executable on success, null on error</returns>
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public static Executable ParseExecutable(byte[] data, int offset)
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{
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// If the data is invalid
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if (data == null)
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return null;
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// If the offset is out of bounds
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if (offset < 0 || offset >= data.Length)
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return null;
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// Cache the current offset
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int initialOffset = offset;
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// Create a new executable to fill
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var executable = new Executable();
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#region MS-DOS Stub
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// Parse the MS-DOS stub
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var stub = MSDOS.ParseExecutable(data, offset);
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if (stub?.Header == null || stub.Header.NewExeHeaderAddr == 0)
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return null;
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// Set the MS-DOS stub
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executable.Stub = stub;
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#endregion
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#region Signature
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offset = (int)(initialOffset + stub.Header.NewExeHeaderAddr);
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executable.Signature = new byte[4];
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for (int i = 0; i < executable.Signature.Length; i++)
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{
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executable.Signature[i] = data.ReadByte(ref offset);
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}
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if (executable.Signature[0] != 'P' || executable.Signature[1] != 'E' || executable.Signature[2] != '\0' || executable.Signature[3] != '\0')
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return null;
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#endregion
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#region COFF File Header
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// Try to parse the COFF file header
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var coffFileHeader = ParseCOFFFileHeader(data, ref offset);
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if (coffFileHeader == null)
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return null;
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// Set the COFF file header
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executable.COFFFileHeader = coffFileHeader;
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#endregion
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#region Optional Header
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// Try to parse the optional header
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var optionalHeader = ParseOptionalHeader(data, ref offset, coffFileHeader.SizeOfOptionalHeader);
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if (optionalHeader == null)
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return null;
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// Set the optional header
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executable.OptionalHeader = optionalHeader;
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#endregion
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#region Section Table
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// Try to parse the section table
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var sectionTable = ParseSectionTable(data, offset, coffFileHeader.NumberOfSections);
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if (sectionTable == null)
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return null;
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// Set the section table
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executable.SectionTable = sectionTable;
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#endregion
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#region COFF Symbol Table and COFF String Table
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// TODO: Validate that this is correct with an "old" PE
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if (coffFileHeader.PointerToSymbolTable != 0)
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{
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// If the offset for the COFF symbol table doesn't exist
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int tableAddress = initialOffset
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+ (int)coffFileHeader.PointerToSymbolTable.ConvertVirtualAddress(executable.SectionTable);
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if (tableAddress >= data.Length)
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return executable;
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// Try to parse the COFF symbol table
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var coffSymbolTable = ParseCOFFSymbolTable(data, tableAddress, coffFileHeader.NumberOfSymbols);
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if (coffSymbolTable == null)
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return null;
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// If the offset for the COFF string table doesn't exist
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tableAddress = initialOffset
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+ (int)coffFileHeader.PointerToSymbolTable.ConvertVirtualAddress(executable.SectionTable)
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+ (coffSymbolTable.Length * 18 /* sizeof(COFFSymbolTableEntry) */);
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if (tableAddress >= data.Length)
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return executable;
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// Set the COFF symbol table
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executable.COFFSymbolTable = coffSymbolTable;
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// Try to parse the COFF string table
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var coffStringTable = ParseCOFFStringTable(data, tableAddress);
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if (coffStringTable == null)
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return null;
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// Set the COFF string table
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executable.COFFStringTable = coffStringTable;
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}
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#endregion
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#region Attribute Certificate Table
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if (optionalHeader.CertificateTable != null && optionalHeader.CertificateTable.VirtualAddress != 0)
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{
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// If the offset for the COFF symbol table doesn't exist
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int certificateTableAddress = initialOffset
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+ (int)optionalHeader.CertificateTable.VirtualAddress;
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if (certificateTableAddress >= data.Length)
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return executable;
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// Try to parse the attribute certificate table
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int endOffset = (int)(certificateTableAddress + optionalHeader.CertificateTable.Size);
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var attributeCertificateTable = ParseAttributeCertificateTable(data, certificateTableAddress, endOffset);
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if (attributeCertificateTable == null)
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return null;
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// Set the attribute certificate table
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executable.AttributeCertificateTable = attributeCertificateTable;
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}
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#endregion
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// TODO: DelayLoadDirectoryTable
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#region Resource Directory Table
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// Should also be in the '.rsrc' section
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if (optionalHeader.ResourceTable != null && optionalHeader.ResourceTable.VirtualAddress != 0)
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{
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// If the offset for the resource directory table doesn't exist
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int tableAddress = initialOffset
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+ (int)optionalHeader.ResourceTable.VirtualAddress.ConvertVirtualAddress(executable.SectionTable);
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if (tableAddress >= data.Length)
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return executable;
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// Try to parse the resource directory table
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var resourceDirectoryTable = ParseResourceDirectoryTable(data, tableAddress, tableAddress, executable.SectionTable);
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if (resourceDirectoryTable == null)
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return null;
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// Set the resource directory table
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executable.ResourceDirectoryTable = resourceDirectoryTable;
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}
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#endregion
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// TODO: Finish implementing PE parsing
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return executable;
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}
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/// <summary>
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/// Parse a byte array into a Portable Executable COFF file header
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/// </summary>
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/// <param name="data">Byte array to parse</param>
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/// <param name="offset">Offset into the byte array</param>
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/// <returns>Filled COFF file header on success, null on error</returns>
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private static COFFFileHeader ParseCOFFFileHeader(byte[] data, ref int offset)
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{
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// TODO: Use marshalling here instead of building
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var fileHeader = new COFFFileHeader();
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fileHeader.Machine = (MachineType)data.ReadUInt16(ref offset);
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fileHeader.NumberOfSections = data.ReadUInt16(ref offset);
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fileHeader.TimeDateStamp = data.ReadUInt32(ref offset);
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fileHeader.PointerToSymbolTable = data.ReadUInt32(ref offset);
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fileHeader.NumberOfSymbols = data.ReadUInt32(ref offset);
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fileHeader.SizeOfOptionalHeader = data.ReadUInt16(ref offset);
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fileHeader.Characteristics = (Characteristics)data.ReadUInt16(ref offset);
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return fileHeader;
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}
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/// <summary>
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/// Parse a byte array into an optional header
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/// </summary>
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/// <param name="data">Byte array to parse</param>
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/// <param name="offset">Offset into the byte array</param>
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/// <param name="optionalSize">Size of the optional header</param>
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/// <returns>Filled optional header on success, null on error</returns>
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private static OptionalHeader ParseOptionalHeader(byte[] data, ref int offset, int optionalSize)
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{
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int initialOffset = offset;
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// TODO: Use marshalling here instead of building
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var optionalHeader = new OptionalHeader();
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#region Standard Fields
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optionalHeader.Magic = (OptionalHeaderMagicNumber)data.ReadUInt16(ref offset);
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optionalHeader.MajorLinkerVersion = data.ReadByte(ref offset);
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optionalHeader.MinorLinkerVersion = data.ReadByte(ref offset);
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optionalHeader.SizeOfCode = data.ReadUInt32(ref offset);
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optionalHeader.SizeOfInitializedData = data.ReadUInt32(ref offset);
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optionalHeader.SizeOfUninitializedData = data.ReadUInt32(ref offset);
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optionalHeader.AddressOfEntryPoint = data.ReadUInt32(ref offset);
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optionalHeader.BaseOfCode = data.ReadUInt32(ref offset);
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.BaseOfData = data.ReadUInt32(ref offset);
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#endregion
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#region Windows-Specific Fields
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.ImageBase_PE32 = data.ReadUInt32(ref offset);
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else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
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optionalHeader.ImageBase_PE32Plus = data.ReadUInt64(ref offset);
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optionalHeader.SectionAlignment = data.ReadUInt32(ref offset);
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optionalHeader.FileAlignment = data.ReadUInt32(ref offset);
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optionalHeader.MajorOperatingSystemVersion = data.ReadUInt16(ref offset);
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optionalHeader.MinorOperatingSystemVersion = data.ReadUInt16(ref offset);
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optionalHeader.MajorImageVersion = data.ReadUInt16(ref offset);
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optionalHeader.MinorImageVersion = data.ReadUInt16(ref offset);
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optionalHeader.MajorSubsystemVersion = data.ReadUInt16(ref offset);
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optionalHeader.MinorSubsystemVersion = data.ReadUInt16(ref offset);
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optionalHeader.Win32VersionValue = data.ReadUInt32(ref offset);
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optionalHeader.SizeOfImage = data.ReadUInt32(ref offset);
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optionalHeader.SizeOfHeaders = data.ReadUInt32(ref offset);
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optionalHeader.CheckSum = data.ReadUInt32(ref offset);
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optionalHeader.Subsystem = (WindowsSubsystem)data.ReadUInt16(ref offset);
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optionalHeader.DllCharacteristics = (DllCharacteristics)data.ReadUInt16(ref offset);
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.SizeOfStackReserve_PE32 = data.ReadUInt32(ref offset);
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else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
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optionalHeader.SizeOfStackReserve_PE32Plus = data.ReadUInt64(ref offset);
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.SizeOfStackCommit_PE32 = data.ReadUInt32(ref offset);
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else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
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optionalHeader.SizeOfStackCommit_PE32Plus = data.ReadUInt64(ref offset);
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.SizeOfHeapReserve_PE32 = data.ReadUInt32(ref offset);
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else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
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optionalHeader.SizeOfHeapReserve_PE32Plus = data.ReadUInt64(ref offset);
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if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
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optionalHeader.SizeOfHeapCommit_PE32 = data.ReadUInt32(ref offset);
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else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
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optionalHeader.SizeOfHeapCommit_PE32Plus = data.ReadUInt64(ref offset);
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optionalHeader.LoaderFlags = data.ReadUInt32(ref offset);
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optionalHeader.NumberOfRvaAndSizes = data.ReadUInt32(ref offset);
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#endregion
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#region Data Directories
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if (optionalHeader.NumberOfRvaAndSizes >= 1 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ExportTable = new DataDirectory();
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optionalHeader.ExportTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ExportTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 2 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ImportTable = new DataDirectory();
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optionalHeader.ImportTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ImportTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 3 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ResourceTable = new DataDirectory();
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optionalHeader.ResourceTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ResourceTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 4 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ExceptionTable = new DataDirectory();
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optionalHeader.ExceptionTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ExceptionTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 5 && offset - initialOffset < optionalSize)
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{
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optionalHeader.CertificateTable = new DataDirectory();
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optionalHeader.CertificateTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.CertificateTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 6 && offset - initialOffset < optionalSize)
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{
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optionalHeader.BaseRelocationTable = new DataDirectory();
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optionalHeader.BaseRelocationTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.BaseRelocationTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 7 && offset - initialOffset < optionalSize)
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{
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optionalHeader.Debug = new DataDirectory();
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optionalHeader.Debug.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.Debug.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 8 && offset - initialOffset < optionalSize)
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{
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optionalHeader.Architecture = data.ReadUInt64(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 9 && offset - initialOffset < optionalSize)
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{
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optionalHeader.GlobalPtr = new DataDirectory();
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optionalHeader.GlobalPtr.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.GlobalPtr.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 10 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ThreadLocalStorageTable = new DataDirectory();
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optionalHeader.ThreadLocalStorageTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ThreadLocalStorageTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 11 && offset - initialOffset < optionalSize)
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{
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optionalHeader.LoadConfigTable = new DataDirectory();
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optionalHeader.LoadConfigTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.LoadConfigTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 12 && offset - initialOffset < optionalSize)
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{
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optionalHeader.BoundImport = new DataDirectory();
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optionalHeader.BoundImport.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.BoundImport.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 13 && offset - initialOffset < optionalSize)
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{
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optionalHeader.ImportAddressTable = new DataDirectory();
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optionalHeader.ImportAddressTable.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.ImportAddressTable.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 14 && offset - initialOffset < optionalSize)
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{
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optionalHeader.DelayImportDescriptor = new DataDirectory();
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optionalHeader.DelayImportDescriptor.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.DelayImportDescriptor.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 15 && offset - initialOffset < optionalSize)
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{
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optionalHeader.CLRRuntimeHeader = new DataDirectory();
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optionalHeader.CLRRuntimeHeader.VirtualAddress = data.ReadUInt32(ref offset);
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optionalHeader.CLRRuntimeHeader.Size = data.ReadUInt32(ref offset);
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}
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if (optionalHeader.NumberOfRvaAndSizes >= 16 && offset - initialOffset < optionalSize)
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{
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optionalHeader.Reserved = data.ReadUInt64(ref offset);
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}
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#endregion
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return optionalHeader;
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}
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/// <summary>
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/// Parse a byte array into a section table
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/// </summary>
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/// <param name="data">Byte array to parse</param>
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/// <param name="offset">Offset into the byte array</param>
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/// <param name="count">Number of section table entries to read</param>
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/// <returns>Filled section table on success, null on error</returns>
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private static SectionHeader[] ParseSectionTable(byte[] data, int offset, int count)
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{
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// TODO: Use marshalling here instead of building
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var sectionTable = new SectionHeader[count];
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for (int i = 0; i < count; i++)
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{
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var entry = new SectionHeader();
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entry.Name = data.ReadBytes(ref offset, 8);
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entry.VirtualSize = data.ReadUInt32(ref offset);
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entry.VirtualAddress = data.ReadUInt32(ref offset);
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entry.SizeOfRawData = data.ReadUInt32(ref offset);
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entry.PointerToRawData = data.ReadUInt32(ref offset);
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entry.PointerToRelocations = data.ReadUInt32(ref offset);
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entry.PointerToLinenumbers = data.ReadUInt32(ref offset);
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entry.NumberOfRelocations = data.ReadUInt16(ref offset);
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entry.NumberOfLinenumbers = data.ReadUInt16(ref offset);
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entry.Characteristics = (SectionFlags)data.ReadUInt32(ref offset);
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entry.COFFRelocations = new COFFRelocation[entry.NumberOfRelocations];
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for (int j = 0; i < entry.NumberOfRelocations; j++)
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{
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// TODO: Seek to correct location and read data
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}
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entry.COFFLineNumbers = new COFFLineNumber[entry.NumberOfRelocations];
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for (int j = 0; i < entry.NumberOfRelocations; j++)
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{
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// TODO: Seek to correct location and read data
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}
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sectionTable[i] = entry;
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}
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return sectionTable;
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}
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/// <summary>
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/// Parse a byte array into a COFF symbol table
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/// </summary>
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/// <param name="data">Byte array to parse</param>
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/// <param name="offset">Offset into the byte array</param>
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/// <param name="count">Number of COFF symbol table entries to read</param>
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/// <returns>Filled COFF symbol table on success, null on error</returns>
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private static COFFSymbolTableEntry[] ParseCOFFSymbolTable(byte[] data, int offset, uint count)
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{
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// TODO: Use marshalling here instead of building
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var coffSymbolTable = new COFFSymbolTableEntry[count];
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int auxSymbolsRemaining = 0;
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int currentSymbolType = 0;
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for (int i = 0; i < count; i++)
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{
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// Standard COFF Symbol Table Entry
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if (currentSymbolType == 0)
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{
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var entry = new COFFSymbolTableEntry();
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entry.ShortName = data.ReadBytes(ref offset, 8);
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entry.Zeroes = BitConverter.ToUInt32(entry.ShortName, 0);
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if (entry.Zeroes == 0)
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{
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entry.Offset = BitConverter.ToUInt32(entry.ShortName, 4);
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entry.ShortName = null;
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}
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entry.Value = data.ReadUInt32(ref offset);
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entry.SectionNumber = data.ReadUInt16(ref offset);
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entry.SymbolType = (SymbolType)data.ReadUInt16(ref offset);
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entry.StorageClass = (StorageClass)data.ReadByte(ref offset);
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entry.NumberOfAuxSymbols = data.ReadByte(ref offset);
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coffSymbolTable[i] = entry;
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auxSymbolsRemaining = entry.NumberOfAuxSymbols;
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if (auxSymbolsRemaining == 0)
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continue;
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if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_EXTERNAL
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&& entry.SymbolType == SymbolType.IMAGE_SYM_TYPE_FUNC
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&& entry.SectionNumber > 0)
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{
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currentSymbolType = 1;
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}
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else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_FUNCTION
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&& entry.ShortName != null
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&& ((entry.ShortName[0] == 0x2E && entry.ShortName[1] == 0x62 && entry.ShortName[2] == 0x66) // .bf
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|| (entry.ShortName[0] == 0x2E && entry.ShortName[1] == 0x65 && entry.ShortName[2] == 0x66))) // .ef
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{
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currentSymbolType = 2;
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}
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else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_EXTERNAL
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&& entry.SectionNumber == (ushort)SectionNumber.IMAGE_SYM_UNDEFINED
|
|
&& entry.Value == 0)
|
|
{
|
|
currentSymbolType = 3;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_FILE)
|
|
{
|
|
// TODO: Symbol name should be ".file"
|
|
currentSymbolType = 4;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_STATIC)
|
|
{
|
|
// TODO: Should have the name of a section (like ".text")
|
|
currentSymbolType = 5;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_CLR_TOKEN)
|
|
{
|
|
currentSymbolType = 6;
|
|
}
|
|
}
|
|
|
|
// Auxiliary Format 1: Function Definitions
|
|
else if (currentSymbolType == 1)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat1TagIndex = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat1TotalSize = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat1PointerToLinenumber = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat1PointerToNextFunction = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat1Unused = data.ReadUInt16(ref offset);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 2: .bf and .ef Symbols
|
|
else if (currentSymbolType == 2)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat2Unused1 = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat2Linenumber = data.ReadUInt16(ref offset);
|
|
entry.AuxFormat2Unused2 = data.ReadBytes(ref offset, 6);
|
|
entry.AuxFormat2PointerToNextFunction = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat2Unused3 = data.ReadUInt16(ref offset);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 3: Weak Externals
|
|
else if (currentSymbolType == 3)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat3TagIndex = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat3Characteristics = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat3Unused = data.ReadBytes(ref offset, 10);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 4: Files
|
|
else if (currentSymbolType == 4)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat4FileName = data.ReadBytes(ref offset, 18);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 5: Section Definitions
|
|
else if (currentSymbolType == 5)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat5Length = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat5NumberOfRelocations = data.ReadUInt16(ref offset);
|
|
entry.AuxFormat5NumberOfLinenumbers = data.ReadUInt16(ref offset);
|
|
entry.AuxFormat5CheckSum = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat5Number = data.ReadUInt16(ref offset);
|
|
entry.AuxFormat5Selection = data.ReadByte(ref offset);
|
|
entry.AuxFormat5Unused = data.ReadBytes(ref offset, 3);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 6: CLR Token Definition
|
|
else if (currentSymbolType == 6)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat6AuxType = data.ReadByte(ref offset);
|
|
entry.AuxFormat6Reserved1 = data.ReadByte(ref offset);
|
|
entry.AuxFormat6SymbolTableIndex = data.ReadUInt32(ref offset);
|
|
entry.AuxFormat6Reserved2 = data.ReadBytes(ref offset, 12);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// If we hit the last aux symbol, go back to normal format
|
|
if (auxSymbolsRemaining == 0)
|
|
currentSymbolType = 0;
|
|
}
|
|
|
|
return coffSymbolTable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a COFF string table
|
|
/// </summary>
|
|
/// <param name="data">Byte array to parse</param>
|
|
/// <param name="offset">Offset into the byte array</param>
|
|
/// <returns>Filled COFF string table on success, null on error</returns>
|
|
private static COFFStringTable ParseCOFFStringTable(byte[] data, int offset)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var coffStringTable = new COFFStringTable();
|
|
|
|
coffStringTable.TotalSize = data.ReadUInt32(ref offset);
|
|
|
|
var strings = new List<string>();
|
|
if (coffStringTable.TotalSize > 4)
|
|
{
|
|
uint totalSize = coffStringTable.TotalSize;
|
|
while (totalSize > 0)
|
|
{
|
|
int initialPosition = offset;
|
|
string str = data.ReadString(ref offset);
|
|
strings.Add(str);
|
|
totalSize -= (uint)(offset - initialPosition);
|
|
}
|
|
}
|
|
|
|
coffStringTable.Strings = strings.ToArray();
|
|
|
|
return coffStringTable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a byte array into an attribute certificate table
|
|
/// </summary>
|
|
/// <param name="data">Byte array to parse</param>
|
|
/// <param name="offset">Offset into the byte array</param>
|
|
/// <param name="endOffset">First address not part of the attribute certificate table</param>
|
|
/// <returns>Filled attribute certificate on success, null on error</returns>
|
|
private static AttributeCertificateTableEntry[] ParseAttributeCertificateTable(byte[] data, int offset, int endOffset)
|
|
{
|
|
var attributeCertificateTable = new List<AttributeCertificateTableEntry>();
|
|
|
|
while (offset < endOffset)
|
|
{
|
|
var entry = new AttributeCertificateTableEntry();
|
|
|
|
entry.Length = data.ReadUInt32(ref offset);
|
|
entry.Revision = (WindowsCertificateRevision)data.ReadUInt16(ref offset);
|
|
entry.CertificateType = (WindowsCertificateType)data.ReadUInt16(ref offset);
|
|
if (entry.Length > 0)
|
|
entry.Certificate = data.ReadBytes(ref offset, (int)entry.Length);
|
|
|
|
attributeCertificateTable.Add(entry);
|
|
}
|
|
|
|
return attributeCertificateTable.ToArray();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a byte array into a resource directory table
|
|
/// </summary>
|
|
/// <param name="data">Byte array to parse</param>
|
|
/// <param name="offset">Offset into the byte array</param>
|
|
/// <param name="initialOffset">Initial offset to use in address comparisons</param>
|
|
/// <param name="sections">Section table to use for virtual address translation</param>
|
|
/// <returns>Filled resource directory table on success, null on error</returns>
|
|
private static ResourceDirectoryTable ParseResourceDirectoryTable(byte[] data, int offset, long initialOffset, SectionHeader[] sections)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var resourceDirectoryTable = new ResourceDirectoryTable();
|
|
|
|
resourceDirectoryTable.Characteristics = data.ReadUInt32(ref offset);
|
|
resourceDirectoryTable.TimeDateStamp = data.ReadUInt32(ref offset);
|
|
resourceDirectoryTable.MajorVersion = data.ReadUInt16(ref offset);
|
|
resourceDirectoryTable.MinorVersion = data.ReadUInt16(ref offset);
|
|
resourceDirectoryTable.NumberOfNameEntries = data.ReadUInt16(ref offset);
|
|
resourceDirectoryTable.NumberOfIDEntries = data.ReadUInt16(ref offset);
|
|
|
|
// Perform top-level pass of data
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
resourceDirectoryTable.NameEntries = new ResourceDirectoryEntry[resourceDirectoryTable.NumberOfNameEntries];
|
|
for (int i = 0; i < resourceDirectoryTable.NumberOfNameEntries; i++)
|
|
{
|
|
var entry = new ResourceDirectoryEntry();
|
|
entry.NameOffset = data.ReadUInt32(ref offset);
|
|
|
|
uint newOffset = data.ReadUInt32(ref offset);
|
|
if ((newOffset & 0xF0000000) != 0)
|
|
entry.SubdirectoryOffset = newOffset & ~0xF0000000;
|
|
else
|
|
entry.DataEntryOffset = newOffset;
|
|
|
|
// Read the name from the offset
|
|
int currentOffset = offset;
|
|
offset = (int)(entry.NameOffset + initialOffset);
|
|
var resourceDirectoryString = new ResourceDirectoryString();
|
|
resourceDirectoryString.Length = data.ReadUInt16(ref offset);
|
|
resourceDirectoryString.UnicodeString = data.ReadBytes(ref offset, resourceDirectoryString.Length);
|
|
entry.Name = resourceDirectoryString;
|
|
offset = currentOffset;
|
|
|
|
resourceDirectoryTable.NameEntries[i] = entry;
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
resourceDirectoryTable.IDEntries = new ResourceDirectoryEntry[resourceDirectoryTable.NumberOfIDEntries];
|
|
for (int i = 0; i < resourceDirectoryTable.NumberOfIDEntries; i++)
|
|
{
|
|
var entry = new ResourceDirectoryEntry();
|
|
entry.IntegerID = data.ReadUInt32(ref offset);
|
|
|
|
uint newOffset = data.ReadUInt32(ref offset);
|
|
if ((newOffset & 0xF0000000) != 0)
|
|
entry.SubdirectoryOffset = newOffset & ~0xF0000000;
|
|
else
|
|
entry.DataEntryOffset = newOffset;
|
|
|
|
resourceDirectoryTable.IDEntries[i] = entry;
|
|
}
|
|
}
|
|
|
|
// Read all leaves at this level
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.NameEntries)
|
|
{
|
|
if (entry.SubdirectoryOffset != 0)
|
|
continue;
|
|
|
|
int newOffset = (int)(entry.DataEntryOffset + initialOffset);
|
|
|
|
var resourceDataEntry = new ResourceDataEntry();
|
|
resourceDataEntry.DataRVA = data.ReadUInt32(ref newOffset);
|
|
resourceDataEntry.Size = data.ReadUInt32(ref newOffset);
|
|
resourceDataEntry.Codepage = data.ReadUInt32(ref offset);
|
|
resourceDataEntry.Reserved = data.ReadUInt32(ref offset);
|
|
|
|
// Read the data from the offset
|
|
newOffset = (int)resourceDataEntry.DataRVA.ConvertVirtualAddress(sections);
|
|
if (newOffset > 0)
|
|
resourceDataEntry.Data = data.ReadBytes(ref newOffset, (int)resourceDataEntry.Size);
|
|
|
|
entry.DataEntry = resourceDataEntry;
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.IDEntries)
|
|
{
|
|
if (entry.SubdirectoryOffset != 0)
|
|
continue;
|
|
|
|
int newOffset = (int)(entry.DataEntryOffset + initialOffset);
|
|
|
|
var resourceDataEntry = new ResourceDataEntry();
|
|
resourceDataEntry.DataRVA = data.ReadUInt32(ref newOffset);
|
|
resourceDataEntry.Size = data.ReadUInt32(ref newOffset);
|
|
resourceDataEntry.Codepage = data.ReadUInt32(ref newOffset);
|
|
resourceDataEntry.Reserved = data.ReadUInt32(ref newOffset);
|
|
|
|
// Read the data from the offset
|
|
newOffset = (int)resourceDataEntry.DataRVA.ConvertVirtualAddress(sections);
|
|
if (newOffset > 0)
|
|
resourceDataEntry.Data = data.ReadBytes(ref newOffset, (int)resourceDataEntry.Size);
|
|
|
|
entry.DataEntry = resourceDataEntry;
|
|
}
|
|
}
|
|
|
|
// Now go one level lower
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.NameEntries)
|
|
{
|
|
if (entry.DataEntryOffset != 0)
|
|
continue;
|
|
|
|
int newOffset = (int)(entry.SubdirectoryOffset + initialOffset);
|
|
entry.Subdirectory = ParseResourceDirectoryTable(data, newOffset, initialOffset, sections);
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.IDEntries)
|
|
{
|
|
if (entry.DataEntryOffset != 0)
|
|
continue;
|
|
|
|
int newOffset = (int)(entry.SubdirectoryOffset + initialOffset);
|
|
entry.Subdirectory = ParseResourceDirectoryTable(data, newOffset, initialOffset, sections);
|
|
}
|
|
}
|
|
|
|
return resourceDirectoryTable;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Stream Data
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a Portable Executable
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <returns>Filled executable on success, null on error</returns>
|
|
public static Executable ParseExecutable(Stream data)
|
|
{
|
|
// If the data is invalid
|
|
if (data == null)
|
|
return null;
|
|
|
|
// If the offset is out of bounds
|
|
if (data.Position < 0 || data.Position >= data.Length)
|
|
return null;
|
|
|
|
// Cache the current offset
|
|
int initialOffset = (int)data.Position;
|
|
|
|
// Create a new executable to fill
|
|
var executable = new Executable();
|
|
|
|
#region MS-DOS Stub
|
|
|
|
// Parse the MS-DOS stub
|
|
var stub = MSDOS.ParseExecutable(data);
|
|
if (stub?.Header == null || stub.Header.NewExeHeaderAddr == 0)
|
|
return null;
|
|
|
|
// Set the MS-DOS stub
|
|
executable.Stub = stub;
|
|
|
|
#endregion
|
|
|
|
#region Signature
|
|
|
|
data.Seek(initialOffset + stub.Header.NewExeHeaderAddr, SeekOrigin.Begin);
|
|
executable.Signature = new byte[4];
|
|
for (int i = 0; i < executable.Signature.Length; i++)
|
|
{
|
|
executable.Signature[i] = data.ReadByteValue();
|
|
}
|
|
if (executable.Signature[0] != 'P' || executable.Signature[1] != 'E' || executable.Signature[2] != '\0' || executable.Signature[3] != '\0')
|
|
return null;
|
|
|
|
#endregion
|
|
|
|
#region COFF File Header
|
|
|
|
// Try to parse the COFF file header
|
|
var coffFileHeader = ParseCOFFFileHeader(data);
|
|
if (coffFileHeader == null)
|
|
return null;
|
|
|
|
// Set the COFF file header
|
|
executable.COFFFileHeader = coffFileHeader;
|
|
|
|
#endregion
|
|
|
|
#region Optional Header
|
|
|
|
// Try to parse the optional header
|
|
var optionalHeader = ParseOptionalHeader(data, coffFileHeader.SizeOfOptionalHeader);
|
|
if (optionalHeader == null)
|
|
return null;
|
|
|
|
// Set the optional header
|
|
executable.OptionalHeader = optionalHeader;
|
|
|
|
#endregion
|
|
|
|
#region Section Table
|
|
|
|
// Try to parse the section table
|
|
var sectionTable = ParseSectionTable(data, coffFileHeader.NumberOfSections);
|
|
if (sectionTable == null)
|
|
return null;
|
|
|
|
// Set the section table
|
|
executable.SectionTable = sectionTable;
|
|
|
|
#endregion
|
|
|
|
#region COFF Symbol Table and COFF String Table
|
|
|
|
// TODO: Validate that this is correct with an "old" PE
|
|
if (coffFileHeader.PointerToSymbolTable != 0)
|
|
{
|
|
// If the offset for the COFF symbol table doesn't exist
|
|
int symbolTableAddress = initialOffset
|
|
+ (int)coffFileHeader.PointerToSymbolTable.ConvertVirtualAddress(executable.SectionTable);
|
|
if (symbolTableAddress >= data.Length)
|
|
return executable;
|
|
|
|
// Try to parse the COFF symbol table
|
|
data.Seek(symbolTableAddress, SeekOrigin.Begin);
|
|
var coffSymbolTable = ParseCOFFSymbolTable(data, coffFileHeader.NumberOfSymbols);
|
|
if (coffSymbolTable == null)
|
|
return null;
|
|
|
|
// Set the COFF symbol table
|
|
executable.COFFSymbolTable = coffSymbolTable;
|
|
|
|
// Try to parse the COFF string table
|
|
var coffStringTable = ParseCOFFStringTable(data);
|
|
if (coffStringTable == null)
|
|
return null;
|
|
|
|
// Set the COFF string table
|
|
executable.COFFStringTable = coffStringTable;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Attribute Certificate Table
|
|
|
|
if (optionalHeader.CertificateTable != null && optionalHeader.CertificateTable.VirtualAddress != 0)
|
|
{
|
|
// If the offset for the attribute certificate table doesn't exist
|
|
int certificateTableAddress = initialOffset
|
|
+ (int)optionalHeader.CertificateTable.VirtualAddress;
|
|
if (certificateTableAddress >= data.Length)
|
|
return executable;
|
|
|
|
// Try to parse the attribute certificate table
|
|
data.Seek(certificateTableAddress, SeekOrigin.Begin);
|
|
int endOffset = (int)(certificateTableAddress + optionalHeader.CertificateTable.Size);
|
|
var attributeCertificateTable = ParseAttributeCertificateTable(data, endOffset);
|
|
if (attributeCertificateTable == null)
|
|
return null;
|
|
|
|
// Set the attribute certificate table
|
|
executable.AttributeCertificateTable = attributeCertificateTable;
|
|
}
|
|
|
|
#endregion
|
|
|
|
// TODO: DelayLoadDirectoryTable
|
|
|
|
#region Resource Directory Table
|
|
|
|
// Should also be in the '.rsrc' section
|
|
if (optionalHeader.ResourceTable != null && optionalHeader.ResourceTable.VirtualAddress != 0)
|
|
{
|
|
// If the offset for the resource directory table doesn't exist
|
|
int resourceTableAddress = initialOffset
|
|
+ (int)optionalHeader.ResourceTable.VirtualAddress.ConvertVirtualAddress(executable.SectionTable);
|
|
if (resourceTableAddress >= data.Length)
|
|
return executable;
|
|
|
|
// Try to parse the resource directory table
|
|
data.Seek(resourceTableAddress, SeekOrigin.Begin);
|
|
var resourceDirectoryTable = ParseResourceDirectoryTable(data, data.Position, executable.SectionTable);
|
|
if (resourceDirectoryTable == null)
|
|
return null;
|
|
|
|
// Set the resource directory table
|
|
executable.ResourceDirectoryTable = resourceDirectoryTable;
|
|
}
|
|
|
|
#endregion
|
|
|
|
// TODO: Finish implementing PE parsing
|
|
return executable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a Portable Executable COFF file header
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <returns>Filled executable header on success, null on error</returns>
|
|
private static COFFFileHeader ParseCOFFFileHeader(Stream data)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var fileHeader = new COFFFileHeader();
|
|
|
|
fileHeader.Machine = (MachineType)data.ReadUInt16();
|
|
fileHeader.NumberOfSections = data.ReadUInt16();
|
|
fileHeader.TimeDateStamp = data.ReadUInt32();
|
|
fileHeader.PointerToSymbolTable = data.ReadUInt32();
|
|
fileHeader.NumberOfSymbols = data.ReadUInt32();
|
|
fileHeader.SizeOfOptionalHeader = data.ReadUInt16();
|
|
fileHeader.Characteristics = (Characteristics)data.ReadUInt16();
|
|
|
|
return fileHeader;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into an optional header
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <param name="optionalSize">Size of the optional header</param>
|
|
/// <returns>Filled optional header on success, null on error</returns>
|
|
private static OptionalHeader ParseOptionalHeader(Stream data, int optionalSize)
|
|
{
|
|
long initialOffset = data.Position;
|
|
|
|
// TODO: Use marshalling here instead of building
|
|
var optionalHeader = new OptionalHeader();
|
|
|
|
#region Standard Fields
|
|
|
|
optionalHeader.Magic = (OptionalHeaderMagicNumber)data.ReadUInt16();
|
|
optionalHeader.MajorLinkerVersion = data.ReadByteValue();
|
|
optionalHeader.MinorLinkerVersion = data.ReadByteValue();
|
|
optionalHeader.SizeOfCode = data.ReadUInt32();
|
|
optionalHeader.SizeOfInitializedData = data.ReadUInt32();
|
|
optionalHeader.SizeOfUninitializedData = data.ReadUInt32();
|
|
optionalHeader.AddressOfEntryPoint = data.ReadUInt32();
|
|
optionalHeader.BaseOfCode = data.ReadUInt32();
|
|
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.BaseOfData = data.ReadUInt32();
|
|
|
|
#endregion
|
|
|
|
#region Windows-Specific Fields
|
|
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.ImageBase_PE32 = data.ReadUInt32();
|
|
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
|
|
optionalHeader.ImageBase_PE32Plus = data.ReadUInt64();
|
|
optionalHeader.SectionAlignment = data.ReadUInt32();
|
|
optionalHeader.FileAlignment = data.ReadUInt32();
|
|
optionalHeader.MajorOperatingSystemVersion = data.ReadUInt16();
|
|
optionalHeader.MinorOperatingSystemVersion = data.ReadUInt16();
|
|
optionalHeader.MajorImageVersion = data.ReadUInt16();
|
|
optionalHeader.MinorImageVersion = data.ReadUInt16();
|
|
optionalHeader.MajorSubsystemVersion = data.ReadUInt16();
|
|
optionalHeader.MinorSubsystemVersion = data.ReadUInt16();
|
|
optionalHeader.Win32VersionValue = data.ReadUInt32();
|
|
optionalHeader.SizeOfImage = data.ReadUInt32();
|
|
optionalHeader.SizeOfHeaders = data.ReadUInt32();
|
|
optionalHeader.CheckSum = data.ReadUInt32();
|
|
optionalHeader.Subsystem = (WindowsSubsystem)data.ReadUInt16();
|
|
optionalHeader.DllCharacteristics = (DllCharacteristics)data.ReadUInt16();
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.SizeOfStackReserve_PE32 = data.ReadUInt32();
|
|
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
|
|
optionalHeader.SizeOfStackReserve_PE32Plus = data.ReadUInt64();
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.SizeOfStackCommit_PE32 = data.ReadUInt32();
|
|
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
|
|
optionalHeader.SizeOfStackCommit_PE32Plus = data.ReadUInt64();
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.SizeOfHeapReserve_PE32 = data.ReadUInt32();
|
|
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
|
|
optionalHeader.SizeOfHeapReserve_PE32Plus = data.ReadUInt64();
|
|
if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32)
|
|
optionalHeader.SizeOfHeapCommit_PE32 = data.ReadUInt32();
|
|
else if (optionalHeader.Magic == OptionalHeaderMagicNumber.PE32Plus)
|
|
optionalHeader.SizeOfHeapCommit_PE32Plus = data.ReadUInt64();
|
|
optionalHeader.LoaderFlags = data.ReadUInt32();
|
|
optionalHeader.NumberOfRvaAndSizes = data.ReadUInt32();
|
|
|
|
#endregion
|
|
|
|
#region Data Directories
|
|
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 1 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ExportTable = new DataDirectory();
|
|
optionalHeader.ExportTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ExportTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 2 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ImportTable = new DataDirectory();
|
|
optionalHeader.ImportTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ImportTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 3 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ResourceTable = new DataDirectory();
|
|
optionalHeader.ResourceTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ResourceTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 4 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ExceptionTable = new DataDirectory();
|
|
optionalHeader.ExceptionTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ExceptionTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 5 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.CertificateTable = new DataDirectory();
|
|
optionalHeader.CertificateTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.CertificateTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 6 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.BaseRelocationTable = new DataDirectory();
|
|
optionalHeader.BaseRelocationTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.BaseRelocationTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 7 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.Debug = new DataDirectory();
|
|
optionalHeader.Debug.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.Debug.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 8 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.Architecture = data.ReadUInt64();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 9 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.GlobalPtr = new DataDirectory();
|
|
optionalHeader.GlobalPtr.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.GlobalPtr.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 10 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ThreadLocalStorageTable = new DataDirectory();
|
|
optionalHeader.ThreadLocalStorageTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ThreadLocalStorageTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 11 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.LoadConfigTable = new DataDirectory();
|
|
optionalHeader.LoadConfigTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.LoadConfigTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 12 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.BoundImport = new DataDirectory();
|
|
optionalHeader.BoundImport.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.BoundImport.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 13 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.ImportAddressTable = new DataDirectory();
|
|
optionalHeader.ImportAddressTable.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.ImportAddressTable.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 14 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.DelayImportDescriptor = new DataDirectory();
|
|
optionalHeader.DelayImportDescriptor.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.DelayImportDescriptor.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 15 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.CLRRuntimeHeader = new DataDirectory();
|
|
optionalHeader.CLRRuntimeHeader.VirtualAddress = data.ReadUInt32();
|
|
optionalHeader.CLRRuntimeHeader.Size = data.ReadUInt32();
|
|
}
|
|
if (optionalHeader.NumberOfRvaAndSizes >= 16 && data.Position - initialOffset < optionalSize)
|
|
{
|
|
optionalHeader.Reserved = data.ReadUInt64();
|
|
}
|
|
|
|
#endregion
|
|
|
|
return optionalHeader;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a section table
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <param name="count">Number of section table entries to read</param>
|
|
/// <returns>Filled section table on success, null on error</returns>
|
|
private static SectionHeader[] ParseSectionTable(Stream data, int count)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var sectionTable = new SectionHeader[count];
|
|
|
|
for (int i = 0; i < count; i++)
|
|
{
|
|
var entry = new SectionHeader();
|
|
entry.Name = data.ReadBytes(8);
|
|
entry.VirtualSize = data.ReadUInt32();
|
|
entry.VirtualAddress = data.ReadUInt32();
|
|
entry.SizeOfRawData = data.ReadUInt32();
|
|
entry.PointerToRawData = data.ReadUInt32();
|
|
entry.PointerToRelocations = data.ReadUInt32();
|
|
entry.PointerToLinenumbers = data.ReadUInt32();
|
|
entry.NumberOfRelocations = data.ReadUInt16();
|
|
entry.NumberOfLinenumbers = data.ReadUInt16();
|
|
entry.Characteristics = (SectionFlags)data.ReadUInt32();
|
|
entry.COFFRelocations = new COFFRelocation[entry.NumberOfRelocations];
|
|
for (int j = 0; j < entry.NumberOfRelocations; j++)
|
|
{
|
|
// TODO: Seek to correct location and read data
|
|
}
|
|
entry.COFFLineNumbers = new COFFLineNumber[entry.NumberOfLinenumbers];
|
|
for (int j = 0; j < entry.NumberOfLinenumbers; j++)
|
|
{
|
|
// TODO: Seek to correct location and read data
|
|
}
|
|
sectionTable[i] = entry;
|
|
}
|
|
|
|
return sectionTable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a COFF symbol table
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <param name="count">Number of COFF symbol table entries to read</param>
|
|
/// <returns>Filled COFF symbol table on success, null on error</returns>
|
|
private static COFFSymbolTableEntry[] ParseCOFFSymbolTable(Stream data, uint count)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var coffSymbolTable = new COFFSymbolTableEntry[count];
|
|
|
|
int auxSymbolsRemaining = 0;
|
|
int currentSymbolType = 0;
|
|
|
|
for (int i = 0; i < count; i++)
|
|
{
|
|
// Standard COFF Symbol Table Entry
|
|
if (currentSymbolType == 0)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.ShortName = data.ReadBytes(8);
|
|
entry.Zeroes = BitConverter.ToUInt32(entry.ShortName, 0);
|
|
if (entry.Zeroes == 0)
|
|
{
|
|
entry.Offset = BitConverter.ToUInt32(entry.ShortName, 4);
|
|
entry.ShortName = null;
|
|
}
|
|
entry.Value = data.ReadUInt32();
|
|
entry.SectionNumber = data.ReadUInt16();
|
|
entry.SymbolType = (SymbolType)data.ReadUInt16();
|
|
entry.StorageClass = (StorageClass)data.ReadByte();
|
|
entry.NumberOfAuxSymbols = data.ReadByteValue();
|
|
coffSymbolTable[i] = entry;
|
|
|
|
auxSymbolsRemaining = entry.NumberOfAuxSymbols;
|
|
if (auxSymbolsRemaining == 0)
|
|
continue;
|
|
|
|
if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_EXTERNAL
|
|
&& entry.SymbolType == SymbolType.IMAGE_SYM_TYPE_FUNC
|
|
&& entry.SectionNumber > 0)
|
|
{
|
|
currentSymbolType = 1;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_FUNCTION
|
|
&& entry.ShortName != null
|
|
&& ((entry.ShortName[0] == 0x2E && entry.ShortName[1] == 0x62 && entry.ShortName[2] == 0x66) // .bf
|
|
|| (entry.ShortName[0] == 0x2E && entry.ShortName[1] == 0x65 && entry.ShortName[2] == 0x66))) // .ef
|
|
{
|
|
currentSymbolType = 2;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_EXTERNAL
|
|
&& entry.SectionNumber == (ushort)SectionNumber.IMAGE_SYM_UNDEFINED
|
|
&& entry.Value == 0)
|
|
{
|
|
currentSymbolType = 3;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_FILE)
|
|
{
|
|
// TODO: Symbol name should be ".file"
|
|
currentSymbolType = 4;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_STATIC)
|
|
{
|
|
// TODO: Should have the name of a section (like ".text")
|
|
currentSymbolType = 5;
|
|
}
|
|
else if (entry.StorageClass == StorageClass.IMAGE_SYM_CLASS_CLR_TOKEN)
|
|
{
|
|
currentSymbolType = 6;
|
|
}
|
|
}
|
|
|
|
// Auxiliary Format 1: Function Definitions
|
|
else if (currentSymbolType == 1)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat1TagIndex = data.ReadUInt32();
|
|
entry.AuxFormat1TotalSize = data.ReadUInt32();
|
|
entry.AuxFormat1PointerToLinenumber = data.ReadUInt32();
|
|
entry.AuxFormat1PointerToNextFunction = data.ReadUInt32();
|
|
entry.AuxFormat1Unused = data.ReadUInt16();
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 2: .bf and .ef Symbols
|
|
else if (currentSymbolType == 2)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat2Unused1 = data.ReadUInt32();
|
|
entry.AuxFormat2Linenumber = data.ReadUInt16();
|
|
entry.AuxFormat2Unused2 = data.ReadBytes(6);
|
|
entry.AuxFormat2PointerToNextFunction = data.ReadUInt32();
|
|
entry.AuxFormat2Unused3 = data.ReadUInt16();
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 3: Weak Externals
|
|
else if (currentSymbolType == 3)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat3TagIndex = data.ReadUInt32();
|
|
entry.AuxFormat3Characteristics = data.ReadUInt32();
|
|
entry.AuxFormat3Unused = data.ReadBytes(10);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 4: Files
|
|
else if (currentSymbolType == 4)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat4FileName = data.ReadBytes(18);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 5: Section Definitions
|
|
else if (currentSymbolType == 5)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat5Length = data.ReadUInt32();
|
|
entry.AuxFormat5NumberOfRelocations = data.ReadUInt16();
|
|
entry.AuxFormat5NumberOfLinenumbers = data.ReadUInt16();
|
|
entry.AuxFormat5CheckSum = data.ReadUInt32();
|
|
entry.AuxFormat5Number = data.ReadUInt16();
|
|
entry.AuxFormat5Selection = data.ReadByteValue();
|
|
entry.AuxFormat5Unused = data.ReadBytes(3);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// Auxiliary Format 6: CLR Token Definition
|
|
else if (currentSymbolType == 6)
|
|
{
|
|
var entry = new COFFSymbolTableEntry();
|
|
entry.AuxFormat6AuxType = data.ReadByteValue();
|
|
entry.AuxFormat6Reserved1 = data.ReadByteValue();
|
|
entry.AuxFormat6SymbolTableIndex = data.ReadUInt32();
|
|
entry.AuxFormat6Reserved2 = data.ReadBytes(12);
|
|
coffSymbolTable[i] = entry;
|
|
auxSymbolsRemaining--;
|
|
}
|
|
|
|
// If we hit the last aux symbol, go back to normal format
|
|
if (auxSymbolsRemaining == 0)
|
|
currentSymbolType = 0;
|
|
}
|
|
|
|
return coffSymbolTable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a COFF string table
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <returns>Filled COFF string table on success, null on error</returns>
|
|
private static COFFStringTable ParseCOFFStringTable(Stream data)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var coffStringTable = new COFFStringTable();
|
|
|
|
coffStringTable.TotalSize = data.ReadUInt32();
|
|
|
|
var strings = new List<string>();
|
|
if (coffStringTable.TotalSize > 4)
|
|
{
|
|
uint totalSize = coffStringTable.TotalSize;
|
|
while (totalSize > 0)
|
|
{
|
|
long initialPosition = data.Position;
|
|
string str = data.ReadString();
|
|
strings.Add(str);
|
|
totalSize -= (uint)(data.Position - initialPosition);
|
|
}
|
|
}
|
|
|
|
coffStringTable.Strings = strings.ToArray();
|
|
|
|
return coffStringTable;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into an attribute certificate table
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <param name="endOffset">First address not part of the attribute certificate table</param>
|
|
/// <returns>Filled attribute certificate on success, null on error</returns>
|
|
private static AttributeCertificateTableEntry[] ParseAttributeCertificateTable(Stream data, int endOffset)
|
|
{
|
|
var attributeCertificateTable = new List<AttributeCertificateTableEntry>();
|
|
|
|
while (data.Position < endOffset)
|
|
{
|
|
var entry = new AttributeCertificateTableEntry();
|
|
|
|
entry.Length = data.ReadUInt32();
|
|
entry.Revision = (WindowsCertificateRevision)data.ReadUInt16();
|
|
entry.CertificateType = (WindowsCertificateType)data.ReadUInt16();
|
|
if (entry.Length > 0)
|
|
entry.Certificate = data.ReadBytes((int)entry.Length);
|
|
|
|
attributeCertificateTable.Add(entry);
|
|
}
|
|
|
|
return attributeCertificateTable.ToArray();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parse a Stream into a resource directory table
|
|
/// </summary>
|
|
/// <param name="data">Stream to parse</param>
|
|
/// <param name="initialOffset">Initial offset to use in address comparisons</param>
|
|
/// <param name="sections">Section table to use for virtual address translation</param>
|
|
/// <returns>Filled resource directory table on success, null on error</returns>
|
|
private static ResourceDirectoryTable ParseResourceDirectoryTable(Stream data, long initialOffset, SectionHeader[] sections)
|
|
{
|
|
// TODO: Use marshalling here instead of building
|
|
var resourceDirectoryTable = new ResourceDirectoryTable();
|
|
|
|
resourceDirectoryTable.Characteristics = data.ReadUInt32();
|
|
resourceDirectoryTable.TimeDateStamp = data.ReadUInt32();
|
|
resourceDirectoryTable.MajorVersion = data.ReadUInt16();
|
|
resourceDirectoryTable.MinorVersion = data.ReadUInt16();
|
|
resourceDirectoryTable.NumberOfNameEntries = data.ReadUInt16();
|
|
resourceDirectoryTable.NumberOfIDEntries = data.ReadUInt16();
|
|
|
|
// Perform top-level pass of data
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
resourceDirectoryTable.NameEntries = new ResourceDirectoryEntry[resourceDirectoryTable.NumberOfNameEntries];
|
|
for (int i = 0; i < resourceDirectoryTable.NumberOfNameEntries; i++)
|
|
{
|
|
var entry = new ResourceDirectoryEntry();
|
|
entry.NameOffset = data.ReadUInt32();
|
|
|
|
uint offset = data.ReadUInt32();
|
|
if ((offset & 0xF0000000) != 0)
|
|
entry.SubdirectoryOffset = offset & ~0xF0000000;
|
|
else
|
|
entry.DataEntryOffset = offset;
|
|
|
|
// Read the name from the offset
|
|
long currentOffset = data.Position;
|
|
offset = entry.NameOffset + (uint)initialOffset;
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
var resourceDirectoryString = new ResourceDirectoryString();
|
|
resourceDirectoryString.Length = data.ReadUInt16();
|
|
resourceDirectoryString.UnicodeString = data.ReadBytes(resourceDirectoryString.Length);
|
|
entry.Name = resourceDirectoryString;
|
|
data.Seek(currentOffset, SeekOrigin.Begin);
|
|
|
|
resourceDirectoryTable.NameEntries[i] = entry;
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
resourceDirectoryTable.IDEntries = new ResourceDirectoryEntry[resourceDirectoryTable.NumberOfIDEntries];
|
|
for (int i = 0; i < resourceDirectoryTable.NumberOfIDEntries; i++)
|
|
{
|
|
var entry = new ResourceDirectoryEntry();
|
|
entry.IntegerID = data.ReadUInt32();
|
|
|
|
uint offset = data.ReadUInt32();
|
|
if ((offset & 0xF0000000) != 0)
|
|
entry.SubdirectoryOffset = offset & ~0xF0000000;
|
|
else
|
|
entry.DataEntryOffset = offset;
|
|
|
|
resourceDirectoryTable.IDEntries[i] = entry;
|
|
}
|
|
}
|
|
|
|
// Read all leaves at this level
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.NameEntries)
|
|
{
|
|
if (entry.SubdirectoryOffset != 0)
|
|
continue;
|
|
|
|
uint offset = entry.DataEntryOffset + (uint)initialOffset;
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
|
|
var resourceDataEntry = new ResourceDataEntry();
|
|
resourceDataEntry.DataRVA = data.ReadUInt32();
|
|
resourceDataEntry.Size = data.ReadUInt32();
|
|
resourceDataEntry.Codepage = data.ReadUInt32();
|
|
resourceDataEntry.Reserved = data.ReadUInt32();
|
|
|
|
// Read the data from the offset
|
|
offset = resourceDataEntry.DataRVA.ConvertVirtualAddress(sections);
|
|
if (offset > 0)
|
|
{
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
resourceDataEntry.Data = data.ReadBytes((int)resourceDataEntry.Size);
|
|
}
|
|
|
|
entry.DataEntry = resourceDataEntry;
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.IDEntries)
|
|
{
|
|
if (entry.SubdirectoryOffset != 0)
|
|
continue;
|
|
|
|
uint offset = entry.DataEntryOffset + (uint)initialOffset;
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
|
|
var resourceDataEntry = new ResourceDataEntry();
|
|
resourceDataEntry.DataRVA = data.ReadUInt32();
|
|
resourceDataEntry.Size = data.ReadUInt32();
|
|
resourceDataEntry.Codepage = data.ReadUInt32();
|
|
resourceDataEntry.Reserved = data.ReadUInt32();
|
|
|
|
// Read the data from the offset
|
|
offset = resourceDataEntry.DataRVA.ConvertVirtualAddress(sections);
|
|
if (offset > 0)
|
|
{
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
resourceDataEntry.Data = data.ReadBytes((int)resourceDataEntry.Size);
|
|
}
|
|
|
|
entry.DataEntry = resourceDataEntry;
|
|
}
|
|
}
|
|
|
|
// Now go one level lower
|
|
if (resourceDirectoryTable.NumberOfNameEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.NameEntries)
|
|
{
|
|
if (entry.DataEntryOffset != 0)
|
|
continue;
|
|
|
|
uint offset = entry.SubdirectoryOffset + (uint)initialOffset;
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
entry.Subdirectory = ParseResourceDirectoryTable(data, initialOffset, sections);
|
|
}
|
|
}
|
|
if (resourceDirectoryTable.NumberOfIDEntries > 0)
|
|
{
|
|
foreach (var entry in resourceDirectoryTable.IDEntries)
|
|
{
|
|
if (entry.DataEntryOffset != 0)
|
|
continue;
|
|
|
|
uint offset = entry.SubdirectoryOffset + (uint)initialOffset;
|
|
data.Seek(offset, SeekOrigin.Begin);
|
|
entry.Subdirectory = ParseResourceDirectoryTable(data, initialOffset, sections);
|
|
}
|
|
}
|
|
|
|
return resourceDirectoryTable;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
} |