987 lines
27 KiB
Ruby
987 lines
27 KiB
Ruby
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#!/usr/bin/env ruby
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require 'rex/peparsey/exceptions'
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require 'rex/struct2'
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module Rex
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module PeParsey
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class PeBase
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# #define IMAGE_DOS_SIGNATURE 0x5A4D // MZ
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IMAGE_DOS_SIGNATURE = 0x5a4d
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#
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# typedef struct _IMAGE_DOS_HEADER { // DOS .EXE header
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# WORD e_magic; // Magic number
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# WORD e_cblp; // Bytes on last page of file
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# WORD e_cp; // Pages in file
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# WORD e_crlc; // Relocations
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# WORD e_cparhdr; // Size of header in paragraphs
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# WORD e_minalloc; // Minimum extra paragraphs needed
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# WORD e_maxalloc; // Maximum extra paragraphs needed
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# WORD e_ss; // Initial (relative) SS value
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# WORD e_sp; // Initial SP value
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# WORD e_csum; // Checksum
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# WORD e_ip; // Initial IP value
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# WORD e_cs; // Initial (relative) CS value
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# WORD e_lfarlc; // File address of relocation table
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# WORD e_ovno; // Overlay number
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# WORD e_res[4]; // Reserved words
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# WORD e_oemid; // OEM identifier (for e_oeminfo)
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# WORD e_oeminfo; // OEM information; e_oemid specific
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# WORD e_res2[10]; // Reserved words
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# LONG e_lfanew; // File address of new exe header
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# } IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER;
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#
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IMAGE_DOS_HEADER_SIZE = 64
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IMAGE_DOS_HEADER = Rex::Struct2::CStructTemplate.new(
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[ 'uint16v', 'e_magic', IMAGE_DOS_SIGNATURE ],
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[ 'uint16v', 'e_cblp', 0 ],
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[ 'uint16v', 'e_cp', 0 ],
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[ 'uint16v', 'e_crlc', 0 ],
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[ 'uint16v', 'e_cparhdr', 0 ],
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[ 'uint16v', 'e_minalloc', 0 ],
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[ 'uint16v', 'e_maxalloc', 0 ],
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[ 'uint16v', 'e_ss', 0 ],
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[ 'uint16v', 'e_sp', 0 ],
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[ 'uint16v', 'e_csum', 0 ],
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[ 'uint16v', 'e_ip', 0 ],
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[ 'uint16v', 'e_cs', 0 ],
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[ 'uint16v', 'e_lfarlc', 0 ],
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[ 'uint16v', 'e_ovno', 0 ],
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[ 'template', 'e_res', Rex::Struct2::CStructTemplate.new(
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[ 'uint16v', 'e_res_0', 0 ],
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[ 'uint16v', 'e_res_1', 0 ],
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[ 'uint16v', 'e_res_2', 0 ],
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[ 'uint16v', 'e_res_3', 0 ]
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)],
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[ 'uint16v', 'e_oemid', 0 ],
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[ 'uint16v', 'e_oeminfo', 0 ],
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[ 'template', 'e_res2', Rex::Struct2::CStructTemplate.new(
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[ 'uint16v', 'e_res2_0', 0 ],
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[ 'uint16v', 'e_res2_1', 0 ],
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[ 'uint16v', 'e_res2_2', 0 ],
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[ 'uint16v', 'e_res2_3', 0 ],
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[ 'uint16v', 'e_res2_4', 0 ],
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[ 'uint16v', 'e_res2_5', 0 ],
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[ 'uint16v', 'e_res2_6', 0 ],
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[ 'uint16v', 'e_res2_7', 0 ],
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[ 'uint16v', 'e_res2_8', 0 ],
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[ 'uint16v', 'e_res2_9', 0 ]
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)],
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[ 'uint32v', 'e_lfanew', 0 ]
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)
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class GenericHeader
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attr_accessor :struct
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def initialize(_struct)
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self.struct = _struct
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end
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# this sucks...
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def v
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struct.v
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end
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def [](*args)
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struct[*args]
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end
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end
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class DosHeader < GenericHeader
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def initialize(rawdata)
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dos_header = IMAGE_DOS_HEADER.make_struct
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if !dos_header.from_s(rawdata)
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raise DosHeaderError, "Couldn't parse IMAGE_DOS_HEADER", caller
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end
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if dos_header.v['e_magic'] != IMAGE_DOS_SIGNATURE
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raise DosHeaderError, "Couldn't find DOS e_magic", caller
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end
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self.struct = dos_header
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end
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def e_lfanew
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v['e_lfanew']
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end
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end
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def self._parse_dos_header(rawdata)
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return DosHeader.new(rawdata)
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end
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#
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# typedef struct _IMAGE_FILE_HEADER {
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# WORD Machine;
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# WORD NumberOfSections;
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# DWORD TimeDateStamp;
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# DWORD PointerToSymbolTable;
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# DWORD NumberOfSymbols;
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# WORD SizeOfOptionalHeader;
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# WORD Characteristics;
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# } IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;
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#
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# #define IMAGE_NT_SIGNATURE 0x00004550 // PE00
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# #define IMAGE_FILE_MACHINE_I386 0x014c // Intel 386.
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# #define IMAGE_SIZEOF_FILE_HEADER 20
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#
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IMAGE_NT_SIGNATURE = 0x00004550
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IMAGE_FILE_MACHINE_I386 = 0x014c
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IMAGE_FILE_HEADER_SIZE = 20+4 # because we include the signature
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IMAGE_FILE_HEADER = Rex::Struct2::CStructTemplate.new(
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# not really in the header, but easier for us this way
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[ 'uint32v', 'NtSignature', 0 ],
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[ 'uint16v', 'Machine', 0 ],
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[ 'uint16v', 'NumberOfSections', 0 ],
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[ 'uint32v', 'TimeDateStamp', 0 ],
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[ 'uint32v', 'PointerToSymbolTable', 0 ],
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[ 'uint32v', 'NumberOfSymbols', 0 ],
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[ 'uint16v', 'SizeOfOptionalHeader', 0 ],
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[ 'uint16v', 'Characteristics', 0 ]
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)
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class FileHeader < GenericHeader
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def initialize(rawdata)
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file_header = IMAGE_FILE_HEADER.make_struct
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if !file_header.from_s(rawdata)
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raise FileHeaderError, "Couldn't parse IMAGE_FILE_HEADER", caller
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end
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if file_header.v['NtSignature'] != IMAGE_NT_SIGNATURE
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raise FileHeaderError, "Couldn't find the PE magic!"
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end
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if file_header.v['Machine'] != IMAGE_FILE_MACHINE_I386
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raise FileHeaderError, "I only understand i386 images, not #{file_header.v['Machine']}", caller
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end
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self.struct = file_header
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end
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def SizeOfOptionalHeader
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v['SizeOfOptionalHeader']
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end
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def NumberOfSections
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v['NumberOfSections']
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end
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end
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def self._parse_file_header(rawdata)
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return FileHeader.new(rawdata)
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end
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#
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# typedef struct _IMAGE_IMPORT_DESCRIPTOR {
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# union {
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# DWORD Characteristics; // 0 for terminating null import descriptor
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# DWORD OriginalFirstThunk; // RVA to original unbound IAT (PIMAGE_THUNK_DATA)
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# };
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# DWORD TimeDateStamp; // 0 if not bound,
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# // -1 if bound, and real date\time stamp
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# // in IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT (new BIND)
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# // O.W. date/time stamp of DLL bound to (Old BIND)
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#
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# DWORD ForwarderChain; // -1 if no forwarders
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# DWORD Name;
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# DWORD FirstThunk; // RVA to IAT (if bound this IAT has actual addresses)
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# } IMAGE_IMPORT_DESCRIPTOR;
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#
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IMAGE_ORDINAL_FLAG32 = 0x80000000
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IMAGE_IMPORT_DESCRIPTOR_SIZE = 20
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IMAGE_IMPORT_DESCRIPTOR = Rex::Struct2::CStructTemplate.new(
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[ 'uint32v', 'OriginalFirstThunk', 0 ],
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[ 'uint32v', 'TimeDateStamp', 0 ],
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[ 'uint32v', 'ForwarderChain', 0 ],
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[ 'uint32v', 'Name', 0 ],
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[ 'uint32v', 'FirstThunk', 0 ]
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)
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#
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# typedef struct _IMAGE_IMPORT_BY_NAME {
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# WORD Hint;
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# BYTE Name[1];
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# } IMAGE_IMPORT_BY_NAME, *PIMAGE_IMPORT_BY_NAME;
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#
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class ImportDescriptor
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attr_accessor :name, :entries
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def initialize(_name, _entries)
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self.name = _name
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self.entries = _entries
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end
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end
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class ImportEntry
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attr_accessor :name, :ordinal
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def initialize(_name, _ordinal)
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self.name = _name
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self.ordinal = _ordinal
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end
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end
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#
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# typedef struct _IMAGE_EXPORT_DIRECTORY {
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# DWORD Characteristics;
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# DWORD TimeDateStamp;
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# WORD MajorVersion;
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# WORD MinorVersion;
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# DWORD Name;
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# DWORD Base;
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# DWORD NumberOfFunctions;
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# DWORD NumberOfNames;
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# DWORD AddressOfFunctions; // RVA from base of image
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# DWORD AddressOfNames; // RVA from base of image
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# DWORD AddressOfNameOrdinals; // RVA from base of image
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# } IMAGE_EXPORT_DIRECTORY, *PIMAGE_EXPORT_DIRECTORY;
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#
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IMAGE_EXPORT_DESCRIPTOR_SIZE = 40
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IMAGE_EXPORT_DESCRIPTOR = Rex::Struct2::CStructTemplate.new(
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[ 'uint32v', 'Characteristics', 0 ],
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[ 'uint32v', 'TimeDateStamp', 0 ],
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[ 'uint16v', 'MajorVersion', 0 ],
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[ 'uint16v', 'MinorVersion', 0 ],
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[ 'uint32v', 'Name', 0 ],
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[ 'uint32v', 'Base', 0 ],
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[ 'uint32v', 'NumberOfFunctions', 0 ],
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[ 'uint32v', 'NumberOfNames', 0 ],
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[ 'uint32v', 'AddressOfFunctions', 0 ],
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[ 'uint32v', 'AddressOfNames', 0 ],
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[ 'uint32v', 'AddressOfNameOrdinals', 0 ]
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)
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class ExportDirectory
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attr_accessor :name, :entries, :base
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def initialize(_name, _entries, _base)
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self.name = _name
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self.entries = _entries
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self.base = _base
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end
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end
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class ExportEntry
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attr_accessor :name, :ordinal, :rva
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def initialize(_name, _ordinal, _rva)
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self.name = _name
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self.ordinal = _ordinal
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self.rva = _rva
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end
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end
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#
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# typedef struct _IMAGE_DATA_DIRECTORY {
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# DWORD VirtualAddress;
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# DWORD Size;
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# } IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY;
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#
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IMAGE_NUMBEROF_DIRECTORY_ENTRIES = 16
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IMAGE_DATA_DIRECTORY_SIZE = 8
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IMAGE_DATA_DIRECTORY = Rex::Struct2::CStructTemplate.new(
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[ 'uint32v', 'VirtualAddress', 0 ],
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[ 'uint32v', 'Size', 0 ]
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)
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#
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# typedef struct _IMAGE_OPTIONAL_HEADER {
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# //
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# // Standard fields.
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# //
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#
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# WORD Magic;
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# BYTE MajorLinkerVersion;
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# BYTE MinorLinkerVersion;
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# DWORD SizeOfCode;
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# DWORD SizeOfInitializedData;
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# DWORD SizeOfUninitializedData;
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# DWORD AddressOfEntryPoint;
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# DWORD BaseOfCode;
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# DWORD BaseOfData;
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#
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# //
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# // NT additional fields.
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# //
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#
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# DWORD ImageBase;
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# DWORD SectionAlignment;
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# DWORD FileAlignment;
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# WORD MajorOperatingSystemVersion;
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# WORD MinorOperatingSystemVersion;
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# WORD MajorImageVersion;
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# WORD MinorImageVersion;
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# WORD MajorSubsystemVersion;
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# WORD MinorSubsystemVersion;
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# DWORD Win32VersionValue;
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# DWORD SizeOfImage;
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# DWORD SizeOfHeaders;
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# DWORD CheckSum;
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# WORD Subsystem;
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# WORD DllCharacteristics;
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# DWORD SizeOfStackReserve;
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# DWORD SizeOfStackCommit;
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# DWORD SizeOfHeapReserve;
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# DWORD SizeOfHeapCommit;
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# DWORD LoaderFlags;
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# DWORD NumberOfRvaAndSizes;
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# IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];
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# } IMAGE_OPTIONAL_HEADER32, *PIMAGE_OPTIONAL_HEADER32;
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#
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# #define IMAGE_NT_OPTIONAL_HDR32_MAGIC 0x10b
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# #define IMAGE_SIZEOF_NT_OPTIONAL32_HEADER 224
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#
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IMAGE_NT_OPTIONAL_HDR32_MAGIC = 0x10b
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IMAGE_SIZEOF_NT_OPTIONAL32_HEADER = 224
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IMAGE_OPTIONAL_HEADER32 = Rex::Struct2::CStructTemplate.new(
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[ 'uint16v', 'Magic', 0 ],
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[ 'uint8', 'MajorLinkerVersion', 0 ],
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[ 'uint8', 'MinorLinkerVersion', 0 ],
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[ 'uint32v', 'SizeOfCode', 0 ],
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[ 'uint32v', 'SizeOfInitializeData', 0 ],
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[ 'uint32v', 'SizeOfUninitializeData', 0 ],
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[ 'uint32v', 'AddressOfEntryPoint', 0 ],
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[ 'uint32v', 'BaseOfCode', 0 ],
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[ 'uint32v', 'BaseOfdata', 0 ],
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[ 'uint32v', 'ImageBase', 0 ],
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[ 'uint32v', 'SectionAlignment', 0 ],
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[ 'uint32v', 'FileAlignment', 0 ],
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[ 'uint16v', 'MajorOperatingsystemVersion', 0 ],
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[ 'uint16v', 'MinorOperatingsystemVersion', 0 ],
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[ 'uint16v', 'MajorImageVersion', 0 ],
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[ 'uint16v', 'MinorImageVersion', 0 ],
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[ 'uint16v', 'MajorSubsystemVersion', 0 ],
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[ 'uint16v', 'MinorSubsystemVersion', 0 ],
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[ 'uint32v', 'Win32VersionValue', 0 ],
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|
|
[ 'uint32v', 'SizeOfImage', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfHeaders', 0 ],
|
||
|
|
[ 'uint32v', 'CheckSum', 0 ],
|
||
|
|
[ 'uint16v', 'Subsystem', 0 ],
|
||
|
|
[ 'uint16v', 'DllCharacteristics', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfStackReserve', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfStackCommit', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfHeapReserve', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfHeapCommit', 0 ],
|
||
|
|
[ 'uint32v', 'LoaderFlags', 0 ],
|
||
|
|
[ 'uint32v', 'NumberOfRvaAndSizes', 0 ],
|
||
|
|
[ 'template', 'DataDirectory', Rex::Struct2::CStructTemplate.new(
|
||
|
|
[ 'template', 'DataDirectoryEntry_0', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_1', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_2', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_3', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_4', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_5', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_6', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_7', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_8', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_9', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_10', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_11', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_12', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_13', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_14', IMAGE_DATA_DIRECTORY ],
|
||
|
|
[ 'template', 'DataDirectoryEntry_15', IMAGE_DATA_DIRECTORY ]
|
||
|
|
)]
|
||
|
|
)
|
||
|
|
|
||
|
|
class OptionalHeader < GenericHeader
|
||
|
|
def initialize(rawdata)
|
||
|
|
optional_header = IMAGE_OPTIONAL_HEADER32.make_struct
|
||
|
|
|
||
|
|
if !optional_header.from_s(rawdata)
|
||
|
|
raise OptionalHeaderError, "Couldn't parse IMAGE_OPTIONAL_HEADER32", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
if optional_header.v['Magic'] != IMAGE_NT_OPTIONAL_HDR32_MAGIC
|
||
|
|
raise OptionalHeaderError, "Magic did not match!", caller()
|
||
|
|
end
|
||
|
|
|
||
|
|
self.struct = optional_header
|
||
|
|
end
|
||
|
|
|
||
|
|
def ImageBase
|
||
|
|
v['ImageBase']
|
||
|
|
end
|
||
|
|
def FileAlignment
|
||
|
|
v['FileAlignment']
|
||
|
|
end
|
||
|
|
|
||
|
|
end
|
||
|
|
|
||
|
|
def self._parse_optional_header(rawdata)
|
||
|
|
case rawdata.length
|
||
|
|
# no optional header
|
||
|
|
when 0
|
||
|
|
return nil
|
||
|
|
|
||
|
|
# good, good
|
||
|
|
when IMAGE_SIZEOF_NT_OPTIONAL32_HEADER
|
||
|
|
|
||
|
|
# bad, bad
|
||
|
|
else
|
||
|
|
raise OptionalHeaderError, "I don't know this header size, #{rawdata.length}", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
return OptionalHeader.new(rawdata)
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
# typedef struct _IMAGE_SECTION_HEADER {
|
||
|
|
# BYTE Name[IMAGE_SIZEOF_SHORT_NAME];
|
||
|
|
# union {
|
||
|
|
# DWORD PhysicalAddress;
|
||
|
|
# DWORD VirtualSize;
|
||
|
|
# } Misc;
|
||
|
|
# DWORD VirtualAddress;
|
||
|
|
# DWORD SizeOfRawData;
|
||
|
|
# DWORD PointerToRawData;
|
||
|
|
# DWORD PointerToRelocations;
|
||
|
|
# DWORD PointerToLinenumbers;
|
||
|
|
# WORD NumberOfRelocations;
|
||
|
|
# WORD NumberOfLinenumbers;
|
||
|
|
# DWORD Characteristics;
|
||
|
|
# } IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER;
|
||
|
|
#
|
||
|
|
# #define IMAGE_SIZEOF_SECTION_HEADER 40
|
||
|
|
#
|
||
|
|
|
||
|
|
IMAGE_SIZEOF_SECTION_HEADER = 40
|
||
|
|
IMAGE_SECTION_HEADER = Rex::Struct2::CStructTemplate.new(
|
||
|
|
[ 'string', 'Name', 8, '' ],
|
||
|
|
[ 'uint32v', 'Misc', 0 ],
|
||
|
|
[ 'uint32v', 'VirtualAddress', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfRawData', 0 ],
|
||
|
|
[ 'uint32v', 'PointerToRawData', 0 ],
|
||
|
|
[ 'uint32v', 'PointerToRelocations', 0 ]
|
||
|
|
)
|
||
|
|
|
||
|
|
class SectionHeader < GenericHeader
|
||
|
|
def initialize(rawdata)
|
||
|
|
section_header = IMAGE_SECTION_HEADER.make_struct
|
||
|
|
|
||
|
|
if !section_header.from_s(rawdata)
|
||
|
|
raise SectionHeaderError, "Could not parse header", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
self.struct = section_header
|
||
|
|
end
|
||
|
|
|
||
|
|
def VirtualAddress
|
||
|
|
v['VirtualAddress']
|
||
|
|
end
|
||
|
|
def SizeOfRawData
|
||
|
|
v['SizeOfRawData']
|
||
|
|
end
|
||
|
|
def PointerToRawData
|
||
|
|
v['PointerToRawData']
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
def self._parse_section_headers(rawdata)
|
||
|
|
section_headers = [ ]
|
||
|
|
size = IMAGE_SIZEOF_SECTION_HEADER
|
||
|
|
numsections = rawdata.length / size
|
||
|
|
|
||
|
|
numsections.times do |i|
|
||
|
|
data = rawdata[i * size, size]
|
||
|
|
section_headers << SectionHeader.new(data)
|
||
|
|
end
|
||
|
|
|
||
|
|
return section_headers
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
# typedef struct _IMAGE_BASE_RELOCATION {
|
||
|
|
# DWORD VirtualAddress;
|
||
|
|
# DWORD SizeOfBlock;
|
||
|
|
# // WORD TypeOffset[1];
|
||
|
|
# } IMAGE_BASE_RELOCATION;
|
||
|
|
# typedef IMAGE_BASE_RELOCATION UNALIGNED * PIMAGE_BASE_RELOCATION;
|
||
|
|
#
|
||
|
|
# #define IMAGE_SIZEOF_BASE_RELOCATION 8
|
||
|
|
#
|
||
|
|
IMAGE_SIZEOF_BASE_RELOCATION = 8
|
||
|
|
IMAGE_BASE_RELOCATION = Rex::Struct2::CStructTemplate.new(
|
||
|
|
[ 'uint32v', 'VirtualAddress', 0 ],
|
||
|
|
[ 'uint32v', 'SizeOfBlock', 0 ]
|
||
|
|
)
|
||
|
|
IMAGE_BASE_RELOCATION_TYPE_OFFSET = Rex::Struct2::CStructTemplate.new(
|
||
|
|
[ 'uint16v', 'TypeOffset', 0 ]
|
||
|
|
)
|
||
|
|
|
||
|
|
class RelocationDirectory
|
||
|
|
attr_accessor :entries, :rva
|
||
|
|
|
||
|
|
def initialize(_rva, _entries)
|
||
|
|
self.rva = _rva
|
||
|
|
self.entries = _entries
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
class RelocationEntry
|
||
|
|
attr_accessor :rva, :reltype
|
||
|
|
|
||
|
|
def initialize(_rva, _type)
|
||
|
|
self.rva = _rva
|
||
|
|
self.reltype = _type
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
#
|
||
|
|
# typedef struct {
|
||
|
|
# DWORD Size;
|
||
|
|
# DWORD TimeDateStamp;
|
||
|
|
# WORD MajorVersion;
|
||
|
|
# WORD MinorVersion;
|
||
|
|
# DWORD GlobalFlagsClear;
|
||
|
|
# DWORD GlobalFlagsSet;
|
||
|
|
# DWORD CriticalSectionDefaultTimeout;
|
||
|
|
# DWORD DeCommitFreeBlockThreshold;
|
||
|
|
# DWORD DeCommitTotalFreeThreshold;
|
||
|
|
# DWORD LockPrefixTable; // VA
|
||
|
|
# DWORD MaximumAllocationSize;
|
||
|
|
# DWORD VirtualMemoryThreshold;
|
||
|
|
# DWORD ProcessHeapFlags;
|
||
|
|
# DWORD ProcessAffinityMask;
|
||
|
|
# WORD CSDVersion;
|
||
|
|
# WORD Reserved1;
|
||
|
|
# DWORD EditList; // VA
|
||
|
|
# DWORD SecurityCookie; // VA
|
||
|
|
# DWORD SEHandlerTable; // VA
|
||
|
|
# DWORD SEHandlerCount;
|
||
|
|
# } IMAGE_LOAD_CONFIG_DIRECTORY32, *PIMAGE_LOAD_CONFIG_DIRECTORY32;
|
||
|
|
#
|
||
|
|
IMAGE_LOAD_CONFIG_DIRECTORY32 = Rex::Struct2::CStructTemplate.new(
|
||
|
|
[ 'uint32v', 'Size', 0 ],
|
||
|
|
[ 'uint32v', 'TimeDateStamp', 0 ],
|
||
|
|
[ 'uint32v', 'TimeDateStamp', 0 ],
|
||
|
|
[ 'uint16v', 'MajorVersion', 0 ],
|
||
|
|
[ 'uint16v', 'MinorVersion', 0 ],
|
||
|
|
[ 'uint32v', 'GlobalFlagsClear', 0 ],
|
||
|
|
[ 'uint32v', 'GlobalFlagsSet', 0 ],
|
||
|
|
[ 'uint32v', 'CriticalSectionDefaultTimeout', 0 ],
|
||
|
|
[ 'uint32v', 'DeCommitFreeBlockThreshold', 0 ],
|
||
|
|
[ 'uint32v', 'DeCommitTotalFreeThreshold', 0 ],
|
||
|
|
[ 'uint32v', 'LockPrefixTable', 0 ],
|
||
|
|
[ 'uint32v', 'MaximumAllocationSize', 0 ],
|
||
|
|
[ 'uint32v', 'VirtualMemoryThreshold', 0 ],
|
||
|
|
[ 'uint32v', 'ProcessHeapFlags', 0 ],
|
||
|
|
[ 'uint32v', 'ProcessAffinityMask', 0 ],
|
||
|
|
[ 'uint16v', 'CSDVersion', 0 ],
|
||
|
|
[ 'uint16v', 'Reserved1', 0 ],
|
||
|
|
[ 'uint32v', 'EditList', 0 ],
|
||
|
|
[ 'uint32v', 'SecurityCookie', 0 ],
|
||
|
|
[ 'uint32v', 'SEHandlerTable', 0 ],
|
||
|
|
[ 'uint32v', 'SEHandlerCount', 0 ]
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
#
|
||
|
|
# Just a stupid routine to round an offset up to it's alignment.
|
||
|
|
#
|
||
|
|
# For example, you're going to want this for FileAlignment and
|
||
|
|
# SectionAlignment, etc...
|
||
|
|
#
|
||
|
|
def self._align_offset(offset, alignment)
|
||
|
|
offset += alignment - 1
|
||
|
|
offset -= offset % alignment
|
||
|
|
return offset
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
# instance stuff
|
||
|
|
#
|
||
|
|
|
||
|
|
attr_accessor :_isource
|
||
|
|
attr_accessor :_dos_header, :_file_header, :_optional_header,
|
||
|
|
:_section_headers
|
||
|
|
attr_accessor :sections, :header_section, :image_base
|
||
|
|
|
||
|
|
attr_accessor :_imports_cache, :_imports_cached
|
||
|
|
attr_accessor :_exports_cache, :_exports_cached
|
||
|
|
attr_accessor :_relocations_cache, :_relocations_cached
|
||
|
|
attr_accessor :_loadconfig_cache, :_loadconfig_cached
|
||
|
|
|
||
|
|
|
||
|
|
def self.new_from_file(filename, disk_backed = false)
|
||
|
|
|
||
|
|
file = ::File.new(filename)
|
||
|
|
file.binmode # windows... :\
|
||
|
|
|
||
|
|
if disk_backed
|
||
|
|
return self.new(ImageSource::Disk.new(file))
|
||
|
|
else
|
||
|
|
obj = new_from_string(file.read)
|
||
|
|
file.close
|
||
|
|
return obj
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
def self.new_from_string(data)
|
||
|
|
return self.new(ImageSource::Memory.new(data))
|
||
|
|
end
|
||
|
|
|
||
|
|
def close
|
||
|
|
_isource.close
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
#
|
||
|
|
# Random rva, vma, file offset, section offset, etc
|
||
|
|
# conversion routines...
|
||
|
|
#
|
||
|
|
#
|
||
|
|
def rva_to_vma(rva)
|
||
|
|
return rva + image_base
|
||
|
|
end
|
||
|
|
|
||
|
|
def vma_to_rva(vma)
|
||
|
|
return vma - image_base
|
||
|
|
end
|
||
|
|
|
||
|
|
def rva_to_file_offset(rva)
|
||
|
|
all_sections.each do |section|
|
||
|
|
if section.contains_rva?(rva)
|
||
|
|
return section.rva_to_file_offset(rva)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
raise WtfError, "wtf!", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
def vma_to_file_offset(vma)
|
||
|
|
return rva_to_file_offset(vma_to_rva(vma))
|
||
|
|
end
|
||
|
|
|
||
|
|
def file_offset_to_rva(foffset)
|
||
|
|
if foffset < 0
|
||
|
|
raise WtfError, "lame", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
all_sections.each do |section|
|
||
|
|
if section.contains_file_offset?(foffset)
|
||
|
|
return section.file_offset_to_rva(foffset)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
raise WtfError, "wtf! #{foffset}", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
def file_offset_to_vma(foffset)
|
||
|
|
return rva_to_vma(file_offset_to_rva(foffset))
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
#
|
||
|
|
# Some routines to find which section something belongs
|
||
|
|
# to. These will search all_sections (so including
|
||
|
|
# our fake header section, etc...
|
||
|
|
#
|
||
|
|
#
|
||
|
|
|
||
|
|
#
|
||
|
|
# Find a section by an RVA
|
||
|
|
#
|
||
|
|
def _find_section_by_rva(rva)
|
||
|
|
all_sections.each do |section|
|
||
|
|
if section.contains_rva?(rva)
|
||
|
|
return section
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return nil
|
||
|
|
end
|
||
|
|
def find_section_by_rva(rva)
|
||
|
|
section = _find_section_by_rva(rva)
|
||
|
|
|
||
|
|
if !section
|
||
|
|
raise WtfError, "Cannot find rva! #{rva}", caller
|
||
|
|
end
|
||
|
|
|
||
|
|
return section
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
# Find a section by a VMA
|
||
|
|
#
|
||
|
|
def find_section_by_vma(vma)
|
||
|
|
return find_section_by_rva(vma_to_rva(vma))
|
||
|
|
end
|
||
|
|
|
||
|
|
def valid_rva?(rva)
|
||
|
|
_find_section_by_rva(rva) != nil
|
||
|
|
end
|
||
|
|
def valid_vma?(vma)
|
||
|
|
_find_section_by_rva(vma_to_rva(vma)) != nil
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
#
|
||
|
|
# Some convient methods to read a vma/rva without having
|
||
|
|
# the section... (inefficent though I suppose...)
|
||
|
|
#
|
||
|
|
#
|
||
|
|
|
||
|
|
def read_rva(rva, length)
|
||
|
|
return find_section_by_rva(rva).read_rva(rva, length)
|
||
|
|
end
|
||
|
|
|
||
|
|
def read_vma(vma, length)
|
||
|
|
return read_rva(vma_to_rva(vma), length)
|
||
|
|
end
|
||
|
|
|
||
|
|
def read_asciiz_rva(rva)
|
||
|
|
return find_section_by_rva(rva).read_asciiz_rva(rva)
|
||
|
|
end
|
||
|
|
|
||
|
|
def read_asciiz_vma(vma)
|
||
|
|
return read_asciiz_rva(vma_to_rva(vma))
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
#
|
||
|
|
# Imports, exports, and other stuff!
|
||
|
|
#
|
||
|
|
#
|
||
|
|
|
||
|
|
#
|
||
|
|
# We lazily parse the imports, and then cache it
|
||
|
|
#
|
||
|
|
def imports
|
||
|
|
if !_imports_cached
|
||
|
|
self._imports_cache = _load_imports
|
||
|
|
self._imports_cached = true
|
||
|
|
end
|
||
|
|
return _imports_cache
|
||
|
|
end
|
||
|
|
|
||
|
|
def _load_imports
|
||
|
|
#
|
||
|
|
# Get the data directory entry, size, etc
|
||
|
|
#
|
||
|
|
imports_entry = _optional_header['DataDirectory'][1]
|
||
|
|
rva = imports_entry.v['VirtualAddress']
|
||
|
|
size = imports_entry.v['Size']
|
||
|
|
|
||
|
|
return nil if size == 0
|
||
|
|
|
||
|
|
#
|
||
|
|
# Ok, so we have the data directory, now lets parse it
|
||
|
|
#
|
||
|
|
|
||
|
|
imports = [ ]
|
||
|
|
|
||
|
|
descriptors_data = _isource.read(rva_to_file_offset(rva), size)
|
||
|
|
|
||
|
|
while descriptors_data.length >= IMAGE_IMPORT_DESCRIPTOR_SIZE
|
||
|
|
descriptor = IMAGE_IMPORT_DESCRIPTOR.make_struct
|
||
|
|
descriptor.from_s(descriptors_data)
|
||
|
|
descriptors_data = descriptor.leftover
|
||
|
|
|
||
|
|
othunk = descriptor.v['OriginalFirstThunk']
|
||
|
|
fthunk = descriptor.v['FirstThunk']
|
||
|
|
|
||
|
|
break if fthunk == 0
|
||
|
|
|
||
|
|
dllname = _isource.read_asciiz(rva_to_file_offset(descriptor.v['Name']))
|
||
|
|
|
||
|
|
import = ImportDescriptor.new(dllname, [ ])
|
||
|
|
|
||
|
|
# we perfer the Characteristics/OriginalFirstThunk...
|
||
|
|
thunk_off = rva_to_file_offset(othunk == 0 ? fthunk : othunk)
|
||
|
|
|
||
|
|
while (orgrva = _isource.read(thunk_off, 4).unpack('V')[0]) != 0
|
||
|
|
hint = nil
|
||
|
|
name = nil
|
||
|
|
|
||
|
|
if (orgrva & IMAGE_ORDINAL_FLAG32) != 0
|
||
|
|
hint = orgrva & 0xffff
|
||
|
|
else
|
||
|
|
foff = rva_to_file_offset(orgrva)
|
||
|
|
hint = _isource.read(foff, 2).unpack('v')[0]
|
||
|
|
name = _isource.read_asciiz(foff + 2)
|
||
|
|
end
|
||
|
|
|
||
|
|
import.entries << ImportEntry.new(name, hint)
|
||
|
|
|
||
|
|
thunk_off += 4
|
||
|
|
end
|
||
|
|
|
||
|
|
imports << import
|
||
|
|
end
|
||
|
|
|
||
|
|
return imports
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#
|
||
|
|
# We lazily parse the exports, and then cache it
|
||
|
|
#
|
||
|
|
def exports
|
||
|
|
if !_exports_cached
|
||
|
|
self._exports_cache = _load_exports
|
||
|
|
self._exports_cached = true
|
||
|
|
end
|
||
|
|
return _exports_cache
|
||
|
|
end
|
||
|
|
|
||
|
|
def _load_exports
|
||
|
|
|
||
|
|
#
|
||
|
|
# Get the data directory entry, size, etc
|
||
|
|
#
|
||
|
|
exports_entry = _optional_header['DataDirectory'][0]
|
||
|
|
rva = exports_entry.v['VirtualAddress']
|
||
|
|
size = exports_entry.v['Size']
|
||
|
|
|
||
|
|
return nil if size == 0
|
||
|
|
|
||
|
|
#
|
||
|
|
# Ok, so we have the data directory, now lets parse it
|
||
|
|
#
|
||
|
|
|
||
|
|
directory = IMAGE_EXPORT_DESCRIPTOR.make_struct
|
||
|
|
directory.from_s(_isource.read(rva_to_file_offset(rva), IMAGE_EXPORT_DESCRIPTOR_SIZE))
|
||
|
|
|
||
|
|
#
|
||
|
|
# We can have nameless exports, so we need to do the whole
|
||
|
|
# NumberOfFunctions NumberOfNames foo
|
||
|
|
#
|
||
|
|
num_functions = directory.v['NumberOfFunctions']
|
||
|
|
num_names = directory.v['NumberOfNames']
|
||
|
|
|
||
|
|
dllname_rva = directory.v['Name']
|
||
|
|
dllname = _isource.read_asciiz(rva_to_file_offset(dllname_rva))
|
||
|
|
|
||
|
|
# FIXME Base, etc
|
||
|
|
fun_off = rva_to_file_offset(directory.v['AddressOfFunctions'])
|
||
|
|
name_off = rva_to_file_offset(directory.v['AddressOfNames'])
|
||
|
|
ord_off = rva_to_file_offset(directory.v['AddressOfNameOrdinals'])
|
||
|
|
base = directory.v['Base']
|
||
|
|
|
||
|
|
# Allocate the list of names
|
||
|
|
names = Array.new(num_functions)
|
||
|
|
|
||
|
|
#
|
||
|
|
# Iterate the names and name/ordinal list, getting the names
|
||
|
|
# and storing them in the name list...
|
||
|
|
#
|
||
|
|
num_names.times do |i|
|
||
|
|
name_rva = _isource.read(name_off + (i * 4), 4).unpack('V')[0]
|
||
|
|
ordinal = _isource.read(ord_off + (i * 2), 2).unpack('v')[0]
|
||
|
|
name = _isource.read_asciiz(rva_to_file_offset(name_rva))
|
||
|
|
|
||
|
|
# store the exported name in the name list
|
||
|
|
names[ordinal] = name
|
||
|
|
end
|
||
|
|
|
||
|
|
exports = ExportDirectory.new(dllname, [ ], base)
|
||
|
|
|
||
|
|
#
|
||
|
|
# Now just iterate the functions (rvas) list..
|
||
|
|
#
|
||
|
|
num_functions.times do |i|
|
||
|
|
rva = _isource.read(fun_off + (i * 4), 4).unpack('V')[0]
|
||
|
|
|
||
|
|
# ExportEntry.new(name, ordinal, rva)
|
||
|
|
exports.entries << ExportEntry.new(names[i], i + base, rva)
|
||
|
|
end
|
||
|
|
|
||
|
|
return exports
|
||
|
|
end
|
||
|
|
|
||
|
|
#
|
||
|
|
# Base relocations in the hizzy
|
||
|
|
#
|
||
|
|
def relocations
|
||
|
|
if !_relocations_cached
|
||
|
|
self._relocations_cache = _load_relocations
|
||
|
|
self._relocations_cached = true
|
||
|
|
end
|
||
|
|
return _relocations_cache
|
||
|
|
end
|
||
|
|
|
||
|
|
def _load_relocations
|
||
|
|
|
||
|
|
#
|
||
|
|
# Get the data directory entry, size, etc
|
||
|
|
#
|
||
|
|
exports_entry = _optional_header['DataDirectory'][5]
|
||
|
|
rva = exports_entry.v['VirtualAddress']
|
||
|
|
size = exports_entry.v['Size']
|
||
|
|
|
||
|
|
return nil if size == 0
|
||
|
|
|
||
|
|
#
|
||
|
|
# Ok, so we have the data directory, now lets parse it
|
||
|
|
#
|
||
|
|
|
||
|
|
dirdata = _isource.read(rva_to_file_offset(rva), size)
|
||
|
|
|
||
|
|
relocdirs = [ ]
|
||
|
|
|
||
|
|
while dirdata.length >= IMAGE_SIZEOF_BASE_RELOCATION
|
||
|
|
header = IMAGE_BASE_RELOCATION.make_struct
|
||
|
|
header.from_s(dirdata)
|
||
|
|
dirdata = header.leftover
|
||
|
|
|
||
|
|
numrelocs = (header.v['SizeOfBlock'] - IMAGE_SIZEOF_BASE_RELOCATION) / 2
|
||
|
|
|
||
|
|
relocbase = header.v['VirtualAddress']
|
||
|
|
|
||
|
|
relocdir = RelocationDirectory.new(relocbase, [ ])
|
||
|
|
|
||
|
|
numrelocs.times do
|
||
|
|
reloc = IMAGE_BASE_RELOCATION_TYPE_OFFSET.make_struct
|
||
|
|
reloc.from_s(dirdata)
|
||
|
|
dirdata = reloc.leftover
|
||
|
|
|
||
|
|
typeoffset = reloc.v['TypeOffset']
|
||
|
|
|
||
|
|
relocrva = relocbase + (typeoffset & 0xfff)
|
||
|
|
reloctype = (typeoffset >> 12) & 0xf
|
||
|
|
|
||
|
|
relocdir.entries << RelocationEntry.new(relocrva, reloctype)
|
||
|
|
end
|
||
|
|
|
||
|
|
relocdirs << relocdir
|
||
|
|
end
|
||
|
|
|
||
|
|
return relocdirs
|
||
|
|
end
|
||
|
|
|
||
|
|
def loadconfig
|
||
|
|
if !_loadconfig_cached
|
||
|
|
self._loadconfig_cache = _load_loadconfig
|
||
|
|
self._loadconfig_cached = true
|
||
|
|
end
|
||
|
|
return _loadconfig_cache
|
||
|
|
end
|
||
|
|
|
||
|
|
def _load_loadconfig
|
||
|
|
|
||
|
|
#
|
||
|
|
# Get the data directory entry, size, etc
|
||
|
|
#
|
||
|
|
exports_entry = _optional_header['DataDirectory'][10]
|
||
|
|
rva = exports_entry.v['VirtualAddress']
|
||
|
|
size = exports_entry.v['Size']
|
||
|
|
|
||
|
|
return nil if size == 0
|
||
|
|
|
||
|
|
return size
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
end end end
|
||
|
|
|