157 lines
3.4 KiB
Ruby
157 lines
3.4 KiB
Ruby
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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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 options, respectively. 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 = true)
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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 = fd.get_once
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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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# 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 = true)
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ftpsock = connect(global, verbose)
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if (not (user and pass))
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print_status("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_status("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_status("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_recv("USER #{user}\r\n", 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_recv("PASS #{pass}\r\n", 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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if (recv)
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return raw_send_recv(cmd, nsock)
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else
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return raw_send(cmd, nsock)
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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 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
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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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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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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
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end
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end
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