Class: Rex::OLE::Header

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/ole/header.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Header

Returns a new instance of Header.



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# File 'lib/rex/ole/header.rb', line 33

def initialize
	set_defaults

	# calculate some numbers (save a little math)
	@sector_size = 1 << @_uSectorShift
	@mini_sector_size = 1 << @_uMiniSectorShift
	@idx_per_sect = @sector_size / 4
end

Instance Attribute Details

#_csectDif ⇒ Object

Returns the value of attribute _csectDif.



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# File 'lib/rex/ole/header.rb', line 26

def _csectDif
  @_csectDif
end

#_csectFat ⇒ Object

Returns the value of attribute _csectFat.



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# File 'lib/rex/ole/header.rb', line 23

def _csectFat
  @_csectFat
end

#_csectMiniFat ⇒ Object

Returns the value of attribute _csectMiniFat.



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# File 'lib/rex/ole/header.rb', line 24

def _csectMiniFat
  @_csectMiniFat
end

#_sectDifStart ⇒ Object

Returns the value of attribute _sectDifStart.



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# File 'lib/rex/ole/header.rb', line 26

def _sectDifStart
  @_sectDifStart
end

#_sectDirStart ⇒ Object

Returns the value of attribute _sectDirStart.



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# File 'lib/rex/ole/header.rb', line 27

def _sectDirStart
  @_sectDirStart
end

#_sectFat ⇒ Object

Returns the value of attribute _sectFat.



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# File 'lib/rex/ole/header.rb', line 23

def _sectFat
  @_sectFat
end

#_sectMiniFatStart ⇒ Object

Returns the value of attribute _sectMiniFatStart.



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# File 'lib/rex/ole/header.rb', line 24

def _sectMiniFatStart
  @_sectMiniFatStart
end

#_ulMiniSectorCutoff ⇒ Object

Returns the value of attribute _ulMiniSectorCutoff.



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# File 'lib/rex/ole/header.rb', line 25

def _ulMiniSectorCutoff
  @_ulMiniSectorCutoff
end

#_uMajorVersion ⇒ Object

Returns the value of attribute _uMajorVersion.



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# File 'lib/rex/ole/header.rb', line 28

def _uMajorVersion
  @_uMajorVersion
end

#_uMiniSectorShift ⇒ Object

Returns the value of attribute _uMiniSectorShift.



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# File 'lib/rex/ole/header.rb', line 25

def _uMiniSectorShift
  @_uMiniSectorShift
end

#idx_per_sect ⇒ Object

Returns the value of attribute idx_per_sect.



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# File 'lib/rex/ole/header.rb', line 30

def idx_per_sect
  @idx_per_sect
end

#mini_sector_size ⇒ Object

Returns the value of attribute mini_sector_size.



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# File 'lib/rex/ole/header.rb', line 31

def mini_sector_size
  @mini_sector_size
end

#sector_size ⇒ Object

Returns the value of attribute sector_size.



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# File 'lib/rex/ole/header.rb', line 30

def sector_size
  @sector_size
end

Instance Method Details

#read(fd) ⇒ Object

low-level functions



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# File 'lib/rex/ole/header.rb', line 129

def read(fd)
	buf = fd.read(HDR_SZ)

	@_abSig        = buf[0x00,8]
	if (@_abSig != SIG) and (@_abSig != SIG_BETA)
		raise RuntimeError, 'Invalid signature for OLE file'
	end
	@_clid = CLSID.new(buf[0x08,16])

	@_uByteOrder   = Util.get16(buf, 0x1c)
	Util.set_endian(@_uByteOrder)

	@_uMinorVersion       = Util.get16(buf, 0x18)
	@_uMajorVersion       = Util.get16(buf, 0x1a)

	@_uSectorShift        = Util.get16(buf, 0x1e)
	@_uMiniSectorShift    = Util.get16(buf, 0x20)

	# ignore reserved bytes

	@_csectDir            = Util.get32(buf, 0x28) # NOTE: only for v4 files

	@_csectFat            = Util.get32(buf, 0x2c)
	@_sectDirStart        = Util.get32(buf, 0x30)

	@_signature           = Util.get32(buf, 0x34)

	@_ulMiniSectorCutoff  = Util.get32(buf, 0x38)
	@_sectMiniFatStart    = Util.get32(buf, 0x3c)
	@_csectMiniFat        = Util.get32(buf, 0x40)

	@_sectDifStart        = Util.get32(buf, 0x44)
	@_csectDif            = Util.get32(buf, 0x48)

	@_sectFat = Util.get32array(buf[0x4c, (109 * 4)])
end

#set_defaults ⇒ Object 



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# File 'lib/rex/ole/header.rb', line 42

def set_defaults
	@_abSig               = SIG
	@_clid = CLSID.new
	@_uByteOrder          = LITTLE_ENDIAN

	@_uMinorVersion       = 0x3e
	@_uMajorVersion       = 0x03

	@_uSectorShift        = 9         # 512 byte sectors
	@_uMiniSectorShift    = 6         # 64 byte mini-sectors

	@_csectDir            = nil             # TBD (v4 only, 1 required)

	@_csectFat            = nil             # TBD (one required)
	@_sectDirStart        = nil             # TBD (one required)

	@_signature           = 0               # no transactions support

	@_ulMiniSectorCutoff  = 0x1000    # 4k
	@_sectMiniFatStart    = SECT_END   # TBD
	@_csectMiniFat        = 0               # TBD

	@_sectDifStart        = SECT_END   # TBD (default to none)
	@_csectDif            = 0               # TBD (default to none)

	@_sectFat             = []              # TBD
end

#to_s ⇒ Object 



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# File 'lib/rex/ole/header.rb', line 70

def to_s
	ret = "{\n"
	ret << "  _abSig => \"%s\"" % Util.Printable(@_abSig)
	ret << ",\n"
	ret << "  _clid => %s" % @_clid.to_s
	ret << ",\n"
	ret << "  _uMinorVersion => 0x%04x" % @_uMinorVersion
	ret << ",\n"
	ret << "  _uMajorVersion => 0x%04x" % @_uMajorVersion
	ret << ",\n"
	ret << "  _uByteOrder => 0x%04x" % @_uByteOrder
	ret << ",\n"
	ret << "  _uSectorShift => 0x%04x" % @_uSectorShift
	ret << ",\n"
	ret << "  _uMiniSectorShift => 0x%04x" % @_uMiniSectorShift
	ret << ",\n"

	if (@_csectDir)
		ret << "  _csectDir => 0x%08x" % @_csectDir
	else
		ret << "  _csectDir => UNALLOCATED" % @_csectDir
	end
	ret << ",\n"

	if (@_csectFat)
		ret << "  _csectFat => 0x%08x" % @_csectFat
	else
		ret << "  _csectFat => UNALLOCATED"
	end
	ret << ",\n"

	if (@_sectDirStart)
		ret << "  _sectDirStart => 0x%08x" % @_sectDirStart
	else
		ret << "  _sectDirStart => UNALLOCATED"
	end
	ret << ",\n"

	ret << "  _signature => 0x%08x" % @_signature
	ret << ",\n"
	ret << "  _uMiniSectorCutoff => 0x%08x" % @_ulMiniSectorCutoff
	ret << ",\n"
	ret << "  _sectMiniFatStart => 0x%08x" % @_sectMiniFatStart
	ret << ",\n"
	ret << "  _csectMiniFat => 0x%08x" % @_csectMiniFat
	ret << ",\n"
	ret << "  _sectDifStart => 0x%08x" % @_sectDifStart
	ret << ",\n"
	ret << "  _csectDif => 0x%08x" % @_csectDif
	#ret << ",\n"
	#ret << "  _sectFat => "
	#ret << Rex::Text.to_hex_dump32array(@_sectFat)
	ret << "\n}"
	ret
end

#write(fd) ⇒ Object 



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# File 'lib/rex/ole/header.rb', line 166

def write(fd)
	hdr = ""
	hdr << @_abSig
	hdr << @_clid.pack
	hdr << Util.pack16(@_uMinorVersion)
	hdr << Util.pack16(@_uMajorVersion)
	hdr << Util.pack16(@_uByteOrder)
	hdr << Util.pack16(@_uSectorShift)
	hdr << Util.pack16(@_uMiniSectorShift)
	if (@_uMajorVersion == 0x04)
		hdr << "\x00" * 6 # reserved bytes
		hdr << Util.pack32(@_csectDir)
	else
		hdr << "\x00" * 10 # reserved bytes
	end

	fs_count = @_csectFat
	fs_count ||= 0
	hdr << Util.pack32(fs_count)

	dir_start = @_sectDirStart
	dir_start ||= SECT_END
	hdr << Util.pack32(dir_start)

	hdr << Util.pack32(@_signature)
	hdr << Util.pack32(@_ulMiniSectorCutoff)
	hdr << Util.pack32(@_sectMiniFatStart)
	hdr << Util.pack32(@_csectMiniFat)
	hdr << Util.pack32(@_sectDifStart)
	hdr << Util.pack32(@_csectDif)
	hdr << Util.pack32array(@_sectFat)

	fd.seek(0, ::IO::SEEK_SET)
	fd.write(hdr)
end