345 lines
8.3 KiB
Ruby
345 lines
8.3 KiB
Ruby
# -*- coding: binary -*-
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module Msf
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require 'msf/core/exploit/tcp'
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###
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#
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# This module exposes methods that may be useful to exploits that deal with
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# servers that speak the File Transfer Protocol (FTP).
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#
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###
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module Exploit::Remote::Ftp
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include Exploit::Remote::Tcp
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#
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# Creates an instance of an FTP exploit module.
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#
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def initialize(info = {})
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super
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# Register the options that all FTP exploits may make use of.
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register_options(
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[
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Opt::RHOST,
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Opt::RPORT(21),
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OptString.new('FTPUSER', [ false, 'The username to authenticate as', 'anonymous']),
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OptString.new('FTPPASS', [ false, 'The password for the specified username', 'mozilla@example.com'])
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], Msf::Exploit::Remote::Ftp)
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register_advanced_options(
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[
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OptInt.new('FTPTimeout', [ true, 'The number of seconds to wait for a reply from an FTP command', 16]),
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OptBool.new('FTPDEBUG', [ false, 'Whether or not to print verbose debug statements', false ])
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], Msf::Exploit::Remote::Ftp)
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register_autofilter_ports([ 21, 2121])
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register_autofilter_services(%W{ ftp })
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@ftpbuff = ""
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end
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#
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# This method establishes an FTP connection to host and port specified by
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# the 'rhost' and 'rport' methods. After connecting, the banner
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# message is read in and stored in the 'banner' attribute.
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#
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def connect(global = true, verbose = nil)
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verbose ||= datastore['FTPDEBUG']
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verbose ||= datastore['VERBOSE']
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print_status("Connecting to FTP server #{rhost}:#{rport}...") if verbose
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fd = super(global)
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# Wait for a banner to arrive...
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self.banner = recv_ftp_resp(fd)
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print_status("Connected to target FTP server.") if verbose
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# Return the file descriptor to the caller
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fd
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end
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#
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# This method handles establishing datasocket for data channel
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#
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def data_connect(mode = nil, nsock = self.sock)
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if mode
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res = send_cmd([ 'TYPE' , mode ], true, nsock)
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return nil if not res =~ /^200/
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end
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# force datasocket to renegotiate
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self.datasocket.shutdown if self.datasocket != nil
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res = send_cmd(['PASV'], true, nsock)
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return nil if not res =~ /^227/
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# 227 Entering Passive Mode (127,0,0,1,196,5)
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if res =~ /\((\d+)\,(\d+),(\d+),(\d+),(\d+),(\d+)/
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# convert port to FTP syntax
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datahost = "#{$1}.#{$2}.#{$3}.#{$4}"
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dataport = ($5.to_i * 256) + $6.to_i
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self.datasocket = Rex::Socket::Tcp.create('PeerHost' => datahost, 'PeerPort' => dataport)
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end
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self.datasocket
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end
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#
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# This method handles disconnecting our data channel
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#
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def data_disconnect
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self.datasocket.shutdown
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self.datasocket = nil
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end
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#
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# Connect and login to the remote FTP server using the credentials
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# that have been supplied in the exploit options.
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#
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def connect_login(global = true, verbose = nil)
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verbose ||= datastore['FTPDEBUG']
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verbose ||= datastore['VERBOSE']
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ftpsock = connect(global, verbose)
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if !(user and pass)
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print_error("No username and password were supplied, unable to login")
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return false
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end
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print_status("Authenticating as #{user} with password #{pass}...") if verbose
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res = send_user(user, ftpsock)
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if (res !~ /^(331|2)/)
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print_error("The server rejected our username") if verbose
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return false
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end
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if (pass)
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print_status("Sending password...") if verbose
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res = send_pass(pass, ftpsock)
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if (res !~ /^2/)
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print_error("The server rejected our password") if verbose
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return false
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end
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end
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return true
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end
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#
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# This method logs in as the supplied user by transmitting the FTP
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# 'USER <user>' command.
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#
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def send_user(user, nsock = self.sock)
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raw_send("USER #{user}\r\n", nsock)
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recv_ftp_resp(nsock)
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end
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#
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# This method completes user authentication by sending the supplied
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# password using the FTP 'PASS <pass>' command.
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#
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def send_pass(pass, nsock = self.sock)
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raw_send("PASS #{pass}\r\n", nsock)
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recv_ftp_resp(nsock)
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end
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#
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# This method sends a QUIT command.
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#
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def send_quit(nsock = self.sock)
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raw_send("QUIT\r\n", nsock)
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recv_ftp_resp(nsock)
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end
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#
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# This method sends one command with zero or more parameters
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#
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def send_cmd(args, recv = true, nsock = self.sock)
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cmd = args.join(" ") + "\r\n"
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ret = raw_send(cmd, nsock)
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if (recv)
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return recv_ftp_resp(nsock)
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end
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return ret
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end
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#
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# This method transmits the command in args and receives / uploads DATA via data channel
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# For commands not needing data, it will fall through to the original send_cmd
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#
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# For commands that send data only, the return will be the server response.
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# For commands returning both data and a server response, an array will be returned.
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#
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# NOTE: This function always waits for a response from the server.
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#
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def send_cmd_data(args, data, mode = 'a', nsock = self.sock)
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type = nil
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# implement some aliases for various commands
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if (args[0] =~ /^DIR$/i || args[0] =~ /^LS$/i)
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# TODO || args[0] =~ /^MDIR$/i || args[0] =~ /^MLS$/i
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args[0] = "LIST"
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type = "get"
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elsif (args[0] =~ /^GET$/i)
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args[0] = "RETR"
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type = "get"
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elsif (args[0] =~ /^PUT$/i)
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args[0] = "STOR"
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type = "put"
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end
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# fall back if it's not a supported data command
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if not type
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return send_cmd(args, true, nsock)
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end
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# Set the transfer mode and connect to the remove server
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return nil if not data_connect(mode)
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# Our pending command should have got a connection now.
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res = send_cmd(args, true, nsock)
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# make sure could open port
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return nil unless res =~ /^(150|125) /
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# dispatch to the proper method
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if (type == "get")
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# failed listings jsut disconnect..
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begin
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data = self.datasocket.get_once(-1, ftp_timeout)
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rescue ::EOFError
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data = nil
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end
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else
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sent = self.datasocket.put(data)
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end
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# close data channel so command channel updates
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data_disconnect
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# get status of transfer
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ret = nil
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if (type == "get")
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ret = recv_ftp_resp(nsock)
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ret = [ ret, data ]
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else
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ret = recv_ftp_resp(nsock)
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end
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ret
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end
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#
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# This method transmits a FTP command and waits for a response. If one is
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# received, it is returned to the caller.
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#
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def raw_send_recv(cmd, nsock = self.sock)
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nsock.put(cmd)
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nsock.get_once(-1, ftp_timeout)
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end
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#
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# This method reads an FTP response based on FTP continuation stuff
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#
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def recv_ftp_resp(nsock = self.sock)
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found_end = false
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resp = ""
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left = ""
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if !@ftpbuff.empty?
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left << @ftpbuff
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@ftpbuff = ""
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end
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while true
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data = nsock.get_once(-1, ftp_timeout)
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if not data
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@ftpbuff << resp
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@ftpbuff << left
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return data
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end
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got = left + data
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left = ""
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# handle the end w/o newline case
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enlidx = got.rindex(0x0a.chr)
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if enlidx != (got.length-1)
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if not enlidx
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left << got
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next
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else
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left << got.slice!((enlidx+1)..got.length)
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end
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end
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# split into lines
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rarr = got.split(/\r?\n/)
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rarr.each do |ln|
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if not found_end
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resp << ln
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resp << "\r\n"
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if ln.length > 3 and ln[3,1] == ' '
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found_end = true
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end
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else
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left << ln
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left << "\r\n"
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end
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end
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if found_end
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@ftpbuff << left
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print_status("FTP recv: #{resp.inspect}") if datastore['FTPDEBUG']
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return resp
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end
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end
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end
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#
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# This method transmits a FTP command and does not wait for a response
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#
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def raw_send(cmd, nsock = self.sock)
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print_status("FTP send: #{cmd.inspect}") if datastore['FTPDEBUG']
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nsock.put(cmd)
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end
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##
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#
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# Wrappers for getters
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#
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##
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#
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# Returns the user string from the 'FTPUSER' option.
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#
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def user
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datastore['FTPUSER']
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end
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#
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# Returns the user string from the 'FTPPASS' option.
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#
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def pass
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datastore['FTPPASS']
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end
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#
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# Returns the number of seconds to wait for a FTP reply
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#
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def ftp_timeout
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(datastore['FTPTimeout'] || 10).to_i
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end
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protected
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#
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# This attribute holds the banner that was read in after a successful call
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# to connect or connect_login.
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#
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attr_accessor :banner, :datasocket
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end
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end
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