Module: Msf::Exploit::Java

Included in:
Remote::JndiInjection
Defined in:
lib/msf/core/exploit/java.rb

Instance Method Summary collapse

Instance Method Details

#build_jar(output_jar, in_files) ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 127

def build_jar(output_jar, in_files)
  if output_jar.class != "".class || in_files.class != [].class
    raise RuntimeError, "Building a jar requires an output_jar and an Array of in_files."
  end

  # Add paths
  in_files	= in_files.map { |file| File.join(datastore['JavaCache'], file) }

  create_jar_klass = Rjb::import('javaCompile.CreateJarFile')
  file_class	 = Rjb::import('java.io.File')

  file_out_jar	= file_class.new_with_sig('Ljava.lang.String;', File.join(datastore['JavaCache'], output_jar) )
  files_in	= Array.new

  in_files.each { |file| files_in << file_class.new_with_sig('Ljava.lang.String;', file) }
  create_jar_klass._invoke('createJarArchive', 'Ljava.io.File;[Ljava.io.File;', file_out_jar, files_in)
end

#compile(classnames, codez, compile_options = nil) ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 83

def compile(classnames, codez, compile_options=nil)
  if !@rjb_loaded or !@jvm_init
    raise RuntimeError, "Could not load rjb and/or the JVM: " + @java_error.to_s
  end

  if !compile_options.is_a?(Array) && compile_options
    raise RuntimeError, "Compiler options must be of type Array."
  end

  compile_options = [] if compile_options.nil?

  # Create the directory if it doesn't exist
  Dir.mkdir(datastore['JavaCache']) if !File.exist? datastore['JavaCache']

  # For compatibility, some exploits need to have the target and source version
  # set to a previous JRE version.
  std_compiler_opts = [ "-target", "1.3", "-source", "1.3", "-d", datastore['JavaCache'] ]

  compile_options += std_compiler_opts

  java_compiler_klass = Rjb::import('javaCompile.CompileSourceInMemory')

  # If we were passed arrays
  if classnames.class == [].class && codez.class == [].class
    # default compile class
    begin
    # Same as java_compiler_klass.CompileFromMemory(	String[] classnames,
    #						String[] codez, String[] compilerOptions)
      success = java_compiler_klass._invoke('CompileFromMemory',
        # Signature explained: [ means array, Lpath.to.object; means object
        # Thus, this reads as call the method with 3 String[] args.
        '[Ljava.lang.String;[Ljava.lang.String;[Ljava.lang.String;',
        classnames, codez, compile_options)
    rescue Exception => e
      print_error "Received unknown error: " + e
    end
  else
    raise RuntimeError, "The Java mixin received unknown argument-type combinations and cannot continue."
  end
  if !success
    raise RuntimeError, "Compile failed."
  end
end

#init_jvm(jvmoptions = nil) ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 40

def init_jvm(jvmoptions = nil)
  if (not ENV['JAVA_HOME'])
    raise RuntimeError, 'JAVA_HOME is not set'
  end

  toolsjar = File.join(ENV['JAVA_HOME'], "lib", "tools.jar")
  if (not File.exist? toolsjar)
    raise RuntimeError, 'JAVA_HOME does not point to a valid JDK installation.'
  end

  # Instantiate the JVM with a classpath pointing to the JDK tools.jar
  # and our javatoolkit jar.
  classpath  = File.join(Msf::Config.data_directory, "exploits", "msfJavaToolkit.jar")
  classpath += ":" + toolsjar
  classpath += ":" + datastore['ADDCLASSPATH'] if datastore['ADDCLASSPATH']

  Rjb::load(classpath, jvmargs=[])

  @jvm_init = true
end

#initialize(info = {}) ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 19

def initialize(info = {})
  super

  register_advanced_options(
    [
      OptString.new( 'JavaCache', 	[true, 'Java cache location',
        File.join(Msf::Config.config_directory, "javacache")]),
      OptString.new( 'AddClassPath', 	[false, 'Additional java classpath', nil]),
    ], self.class)

  begin
    require 'rjb'
    @rjb_loaded = true
    init_jvm
  rescue ::Exception => e
    @rjb_loaded = false
    @jvm_init   = false
    @java_error  = e
  end
end

#query_jvm ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 61

def query_jvm
  return @jvmInit
end

#save_to_file(classnames, codez, location) ⇒ Object 


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# File 'lib/msf/core/exploit/java.rb', line 65

def save_to_file(classnames, codez, location)
  path = File.join( Msf::Config.install_root, "external", "source", location )

  if not File.exist? path
    Dir.mkdir(path)
  end

  i = 0
  classnames.each { |fil|
    file = File.join( path, fil + ".java")
    fp   = File.open( file, "wb" )
    print_status "Writing #{fil} to " + file
    fp.puts codez[i]
    i += 1
    fp.close
  }
end

#serialized_class_from_jar(jar, ser_class) ⇒ String

Create a Java-natively-serialized object for use in Ruby

Parameters:

  • jar (String) —

    Buffer containing JAR data from which to extract the class

  • ser_class (String) —

    The class name to be serialized

Returns:

  • (String) —

    Marshalled serialized byteArray


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# File 'lib/msf/core/exploit/java.rb', line 192

def serialized_class_from_jar(jar, ser_class)
  file_name      = Rex::Text.rand_text_alpha_lower(8)
  file_path      = datastore['JavaCache'] + "/#{file_name}.jar"
  ::File.open(file_path, 'wb+') {|f| f.write(jar)}
  ::Rjb::add_jar(file_path)
  ::File.unlink(file_path)
  payClass       = ::Rjb::import(ser_class)
  byteArrayClass = ::Rjb::import("java.io.ByteArrayOutputStream")
  outputClass    = ::Rjb::import("java.io.ObjectOutputStream")
  payInst        = payClass.new()
  byteArrayInst  = byteArrayClass.new()
  outputInst     = outputClass.new(byteArrayInst)
  begin
    serResult      = outputInst.writeObject(payInst)
  rescue => e
    # Rjb exceptions are pretty broken - try to inform the user of where we keeled
    print_error("Failed to Rjb-serialize the #{ser_class} class due to #{e}")
    raise e
  end
  byteArrayInst.toByteArray()
end

#sign_jar(cert_cn, unsiged_jar, signed_jar, cert_alias = "signFiles", msf_keystore = "msfkeystore", msf_store_pass = "msfstorepass", msf_key_pass = "msfkeypass") ⇒ Object

www.defcon.org/images/defcon-17/dc-17-presentations/defcon-17-valsmith-metaphish.pdf


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# File 'lib/msf/core/exploit/java.rb', line 148

def sign_jar(cert_cn, unsiged_jar, signed_jar, cert_alias="signFiles", msf_keystore="msfkeystore",
    msf_store_pass="msfstorepass", msf_key_pass="msfkeypass")

  # Dependent on $JAVA_HOME/lib/tools.jar that comes with the JDK.
  signer_klass 	= Rjb::import('javaCompile.SignJar')

  # Check if the keystore exists from previous run.  If it does, delete it.
  msf_keystore	= File.join(datastore['JavaCache'], msf_keystore)
  File.delete msf_keystore if File.exist? msf_keystore

  # Rjb pukes on a CN with a comma in it so bad that it crashes to shell
  # and turns input echoing off.  Simple fix for this ugly bug is
  # just to get rid of commas which kinda sucks but whatever.  See #1543.
  keytool_opts	= [
    "-genkey", "-alias", cert_alias, "-keystore", msf_keystore,
    "-storepass", msf_store_pass, "-dname", "CN=#{cert_cn.gsub(",",'')}",
    "-keypass", "msfkeypass"
  ]

  # Build the cert keystore
  signer_klass._invoke('KeyToolMSF','[Ljava.lang.String;',keytool_opts)

  jarsigner_opts	= [
    "-keystore", msf_keystore, "-storepass", msf_store_pass,
    "-keypass", msf_key_pass, "-signedJar",
    File.join(datastore['JavaCache'], signed_jar), 	 # Signed Jar
    File.join(datastore['JavaCache'], unsiged_jar),  # Input Jar we're signing
    cert_alias  # The cert we're using
  ]
  signer_klass._invoke('JarSignerMSF','[Ljava.lang.String;',jarsigner_opts)

  # There are warnings in the source for KeyTool/JarSigner warning that security providers
  # are not released, and if you are calling .main(foo) from another app, you need to release
  # them manually.  This is not done here, and should Rjb be used for anything in the future,
  # this may need to be cleaned up.
end