create telnet clinet mixin
copy paste existing stuff repurposed for use in a real class instead of a metasploit modulebug/bundler_fix
David Maloney
parent
967b0d49b1
commit
747395e383
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@ -0,0 +1,219 @@
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require 'metasploit/framework/tcp/client'
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module Metasploit
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module Framework
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module Telnet
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module Client
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include Metasploit::Framework::Tcp::Client
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include Msf::Auxiliary::Login
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attr_accessor :banner
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#
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# CONSTANTS
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#
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# Borrowing constants from Ruby's Net::Telnet class (ruby license)
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IAC = 255.chr # "\377" # "\xff" # interpret as command
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DONT = 254.chr # "\376" # "\xfe" # you are not to use option
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DO = 253.chr # "\375" # "\xfd" # please, you use option
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WONT = 252.chr # "\374" # "\xfc" # I won't use option
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WILL = 251.chr # "\373" # "\xfb" # I will use option
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SB = 250.chr # "\372" # "\xfa" # interpret as subnegotiation
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GA = 249.chr # "\371" # "\xf9" # you may reverse the line
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EL = 248.chr # "\370" # "\xf8" # erase the current line
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EC = 247.chr # "\367" # "\xf7" # erase the current character
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AYT = 246.chr # "\366" # "\xf6" # are you there
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AO = 245.chr # "\365" # "\xf5" # abort output--but let prog finish
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IP = 244.chr # "\364" # "\xf4" # interrupt process--permanently
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BREAK = 243.chr # "\363" # "\xf3" # break
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DM = 242.chr # "\362" # "\xf2" # data mark--for connect. cleaning
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NOP = 241.chr # "\361" # "\xf1" # nop
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SE = 240.chr # "\360" # "\xf0" # end sub negotiation
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EOR = 239.chr # "\357" # "\xef" # end of record (transparent mode)
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ABORT = 238.chr # "\356" # "\xee" # Abort process
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SUSP = 237.chr # "\355" # "\xed" # Suspend process
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EOF = 236.chr # "\354" # "\xec" # End of file
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SYNCH = 242.chr # "\362" # "\xf2" # for telfunc calls
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OPT_BINARY = 0.chr # "\000" # "\x00" # Binary Transmission
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OPT_ECHO = 1.chr # "\001" # "\x01" # Echo
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OPT_RCP = 2.chr # "\002" # "\x02" # Reconnection
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OPT_SGA = 3.chr # "\003" # "\x03" # Suppress Go Ahead
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OPT_NAMS = 4.chr # "\004" # "\x04" # Approx Message Size Negotiation
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OPT_STATUS = 5.chr # "\005" # "\x05" # Status
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OPT_TM = 6.chr # "\006" # "\x06" # Timing Mark
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OPT_RCTE = 7.chr # "\a" # "\x07" # Remote Controlled Trans and Echo
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OPT_NAOL = 8.chr # "\010" # "\x08" # Output Line Width
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OPT_NAOP = 9.chr # "\t" # "\x09" # Output Page Size
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OPT_NAOCRD = 10.chr # "\n" # "\x0a" # Output Carriage-Return Disposition
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OPT_NAOHTS = 11.chr # "\v" # "\x0b" # Output Horizontal Tab Stops
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OPT_NAOHTD = 12.chr # "\f" # "\x0c" # Output Horizontal Tab Disposition
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OPT_NAOFFD = 13.chr # "\r" # "\x0d" # Output Formfeed Disposition
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OPT_NAOVTS = 14.chr # "\016" # "\x0e" # Output Vertical Tabstops
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OPT_NAOVTD = 15.chr # "\017" # "\x0f" # Output Vertical Tab Disposition
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OPT_NAOLFD = 16.chr # "\020" # "\x10" # Output Linefeed Disposition
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OPT_XASCII = 17.chr # "\021" # "\x11" # Extended ASCII
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OPT_LOGOUT = 18.chr # "\022" # "\x12" # Logout
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OPT_BM = 19.chr # "\023" # "\x13" # Byte Macro
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OPT_DET = 20.chr # "\024" # "\x14" # Data Entry Terminal
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OPT_SUPDUP = 21.chr # "\025" # "\x15" # SUPDUP
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OPT_SUPDUPOUTPUT = 22.chr # "\026" # "\x16" # SUPDUP Output
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OPT_SNDLOC = 23.chr # "\027" # "\x17" # Send Location
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OPT_TTYPE = 24.chr # "\030" # "\x18" # Terminal Type
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OPT_EOR = 25.chr # "\031" # "\x19" # End of Record
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OPT_TUID = 26.chr # "\032" # "\x1a" # TACACS User Identification
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OPT_OUTMRK = 27.chr # "\e" # "\x1b" # Output Marking
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OPT_TTYLOC = 28.chr # "\034" # "\x1c" # Terminal Location Number
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OPT_3270REGIME = 29.chr # "\035" # "\x1d" # Telnet 3270 Regime
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OPT_X3PAD = 30.chr # "\036" # "\x1e" # X.3 PAD
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OPT_NAWS = 31.chr # "\037" # "\x1f" # Negotiate About Window Size
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OPT_TSPEED = 32.chr # " " # "\x20" # Terminal Speed
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OPT_LFLOW = 33.chr # "!" # "\x21" # Remote Flow Control
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OPT_LINEMODE = 34.chr # "\"" # "\x22" # Linemode
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OPT_XDISPLOC = 35.chr # "#" # "\x23" # X Display Location
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OPT_OLD_ENVIRON = 36.chr # "$" # "\x24" # Environment Option
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OPT_AUTHENTICATION = 37.chr # "%" # "\x25" # Authentication Option
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OPT_ENCRYPT = 38.chr # "&" # "\x26" # Encryption Option
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OPT_NEW_ENVIRON = 39.chr # "'" # "\x27" # New Environment Option
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OPT_EXOPL = 255.chr # "\377" # "\xff" # Extended-Options-List
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#
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# This method establishes an Telnet 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. This method has the
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# benefit of handling telnet option negotiation.
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#
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def connect(global = true, verbose = true)
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@trace = ''
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@recvd = ''
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fd = super(global)
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self.banner = ''
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# Wait for a banner to arrive...
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begin
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Timeout.timeout(banner_timeout) do
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while(true)
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buff = recv(fd)
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self.banner << buff if buff
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if(self.banner =~ @login_regex or self.banner =~ @password_regex)
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break
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elsif self.banner =~ @busy_regex
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# It's about to drop connection anyway -- seen on HP JetDirect telnet server
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break
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end
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end
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end
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rescue ::Timeout::Error
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end
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self.banner.strip!
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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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# Sometimes telnet servers start RSTing if you get them angry.
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# This is a short term fix; the problem is that we don't know
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# if it's going to reset forever, or just this time, or randomly.
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# A better solution is to get the socket connect to try again
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# with a little backoff.
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def connect_reset_safe
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begin
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connect
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rescue Rex::ConnectionRefused
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return :refused
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end
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return :connected
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end
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def recv(fd=self.sock, timeout=telnet_timeout)
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recv_telnet(fd, timeout.to_f)
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end
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#
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# Handle telnet option negotiation
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#
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# Appends to the @recvd buffer which is used to tell us whether we're at a
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# login prompt, a password prompt, or a working shell.
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#
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def recv_telnet(fd, timeout)
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data = ''
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begin
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data = fd.get_once(-1, timeout)
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return nil if not data or data.length == 0
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# combine CR+NULL into CR
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data.gsub!(/#{CR}#{NULL}/no, CR)
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# combine EOL into "\n"
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data.gsub!(/#{EOL}/no, "\n")
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data.gsub!(/#{IAC}(
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[#{IAC}#{AO}#{AYT}#{DM}#{IP}#{NOP}]|[#{DO}#{DONT}#{WILL}#{WONT}]
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[#{OPT_BINARY}-#{OPT_NEW_ENVIRON}#{OPT_EXOPL}]|#{SB}[^#{IAC}]*#{IAC}#{SE}
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)/xno) do
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m = $1
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if m == IAC
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IAC
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elsif m == AYT
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fd.write("YES" + EOL)
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''
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elsif m[0,1] == DO
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if(m[1,1] == OPT_BINARY)
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fd.write(IAC + WILL + OPT_BINARY)
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else
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fd.write(IAC + WONT + m[1,1])
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end
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''
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elsif m[0,1] == DONT
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fd.write(IAC + WONT + m[1,1])
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''
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elsif m[0,1] == WILL
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if m[1,1] == OPT_BINARY
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fd.write(IAC + DO + OPT_BINARY)
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# Disable Echo
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elsif m[1,1] == OPT_ECHO
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fd.write(IAC + DONT + OPT_ECHO)
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elsif m[1,1] == OPT_SGA
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fd.write(IAC + DO + OPT_SGA)
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else
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fd.write(IAC + DONT + m[1,1])
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end
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''
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elsif m[0,1] == WONT
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fd.write(IAC + DONT + m[1,1])
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''
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else
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''
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end
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end
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@trace << data
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@recvd << data
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fd.flush
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rescue ::EOFError, ::Errno::EPIPE
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end
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data
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end
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#
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# Wrappers for getters
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#
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def banner_timeout
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raise NotImplementedError
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end
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def telnet_timeout
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raise NotImplementedError
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end
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end
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end
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end
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end
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