Module: PWN::Plugins::BinaryParser

Defined in:
lib/pwn/plugins/binary_parser.rb

Overview

ELF/PE/Mach-O headers, sections, symbols, imports/exports, relocations via Metasm loaders.

Class Method Summary collapse

Class Method Details

.authors ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 147

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <[email protected]>\n"
end

.diff(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 129

public_class_method def self.diff(opts = {})
  a = (opts[:a] || opts[:old]).to_s
  b = (opts[:b] || opts[:new]).to_s
  raise 'ERROR: a and b are required' if a.empty? || b.empty?

  return { error: 'radiff2 missing', hint: 'pwn setup --profile re', a: a, b: b } unless PWN::Plugins::PreflightChecker.bin?(name: 'radiff2')

  stdout, stderr, status = Open3.capture3('radiff2', '-C', a, b)
  funcs = stdout.lines.filter_map do |ln|
    next unless ln.include?(' | ')

    cols = ln.split('|').map(&:strip)
    { a: cols[0], similarity: cols[1].to_f, b: cols[2], changed: cols[1].to_f < 100 }
  end
  funcs = funcs.sort_by { |r| r[:similarity].to_f }
  { a: a, b: b, functions: funcs, stderr: stderr, exit: status.exitstatus }
end

.exports(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 65

public_class_method def self.exports(opts = {})
  exe = load_exe(opts)
  if exe.respond_to?(:export)
    Array(exe.export&.exports).map { |e| e.respond_to?(:name) ? e.name : e.to_s }
  else
    []
  end
rescue StandardError
  []
end

.help ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 151

public_class_method def self.help
  puts "USAGE:
    # List host binaries this module expects to be installed.
    #{self}.required_bins

    # Run load exe and return its result
    #{self}.load_exe(
      path: 'required - filesystem path to read or write'
    )

    # Run info and return its result
    #{self}.info

    # Run sections and return its result
    #{self}.sections

    # Run symbols and return its result
    #{self}.symbols(
      limit: 'optional - limit value consumed by #symbols'
    )

    # Run imports and return its result
    #{self}.imports

    # Run exports and return its result
    #{self}.exports

    # Run relocations and return its result
    #{self}.relocations(
      limit: 'optional - limit value consumed by #relocations'
    )

    # Structured binary triage JSON plus an artifact path under ~/.pwn/artifacts/triage.
    #{self}.triage(
      path: 'required - filesystem path of the binary to triage'
    )

    # Diff two binaries via radiff2 -C (changed functions first).
    #{self}.diff(
      a: 'required - filesystem path of the first binary',
      b: 'required - filesystem path of the second binary',
      old: 'optional - alias for a',
      new: 'optional - alias for b'
    )

    # Print the AUTHOR(S) string for this module.
    #{self}.authors
  "
  constants.sort
end

.imports(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 56

public_class_method def self.imports(opts = {})
  exe = load_exe(opts)
  if exe.respond_to?(:imports)
    Array(exe.imports).map(&:to_s)
  else
    symbols(opts).map { |s| s[:name].to_s }.grep(/plt|imp/i).first(100)
  end
end

.info(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 26

public_class_method def self.info(opts = {})
  exe = load_exe(opts)
  {
    class: exe.class.name,
    cpu: exe.cpu.class.name,
    entrypoint: (exe.optheader.entrypoint if exe.respond_to?(:optheader) && exe.optheader.respond_to?(:entrypoint)),
    format: format_name(exe: exe)
  }
end

.load_exe(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 18

public_class_method def self.load_exe(opts = {})
  path = opts[:path].to_s
  raise 'ERROR: path is required' if path.empty?
  raise "ERROR: file not found: #{path}" unless File.file?(path)

  Metasm::AutoExe.decode_file(path)
end

.relocations(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 76

public_class_method def self.relocations(opts = {})
  exe = load_exe(opts)
  return [] unless exe.respond_to?(:relocations)

  Array(exe.relocations).first((opts[:limit] || 100).to_i).map(&:to_s)
rescue StandardError
  []
end

.required_bins ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 14

public_class_method def self.required_bins
  []
end

.sections(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 36

public_class_method def self.sections(opts = {})
  exe = load_exe(opts)
  Array(exe.sections).map do |sec|
    {
      name: (sec.name if sec.respond_to?(:name)),
      size: (sec.size if sec.respond_to?(:size)),
      virtaddr: (sec.virtaddr if sec.respond_to?(:virtaddr))
    }
  end
end

.symbols(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 47

public_class_method def self.symbols(opts = {})
  exe = load_exe(opts)
  return [] unless exe.respond_to?(:symbols)

  Array(exe.symbols).first((opts[:limit] || 200).to_i).map do |sym|
    { name: (sym.name if sym.respond_to?(:name)), value: (sym.value if sym.respond_to?(:value)) }
  end
end

.triage(opts = {}) ⇒ Object 



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# File 'lib/pwn/plugins/binary_parser.rb', line 85

public_class_method def self.triage(opts = {})
  path = opts[:path].to_s
  inf = info(opts)
  secs = sections(opts)
  imps = Array(imports(opts)).first(40)
  exps = Array(exports(opts)).first(40)
  summary = {
    format: inf[:format],
    arch: inf[:cpu],
    bits: inf[:cpu].to_s[/\d+/],
    endian: inf[:endian] || inf[:ei_data],
    stripped: inf[:stripped],
    static: inf[:static],
    protections: {
      nx: inf[:nx],
      pie: inf[:pie],
      relro: inf[:relro],
      canary: inf[:canary],
      fortify: inf[:fortify]
    },
    sections: secs,
    imports: imps,
    exports: exps,
    strings_top: Array(inf[:strings]).first(20),
    entry: inf[:entry] || inf[:entrypoint],
    function_count: Array(symbols(opts)).length,
    notes: []
  }
  sha = Digest::SHA256.file(path).hexdigest
  dir = File.join(Dir.home, '.pwn', 'cache', 'triage')
  FileUtils.mkdir_p(dir)
  art = File.join(dir, "#{sha}.json")
  if File.file?(art)
    cached = JSON.parse(File.read(art), symbolize_names: true)
    return cached.merge(cached: true, artifact: art)
  end
  body = summary.merge(path: path, sha256: sha)
  File.write(art, JSON.pretty_generate(body))
  facts_dir = File.join(Dir.home, '.pwn', 'engagements', 'default', 'binaries', sha)
  FileUtils.mkdir_p(facts_dir)
  File.write(File.join(facts_dir, 'facts.json'), JSON.pretty_generate(body))
  body.merge(artifact: art, cached: false, facts: File.join(facts_dir, 'facts.json'))
end