Module: Injector

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

Constant Summary collapse

COMMENT_START = 
'# '

Instance Method Summary collapse

Instance Method Details

#inject_to_body(msg) ⇒ Object 



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# File 'lib/bscan/modules/injector.rb', line 100

def inject_to_body msg
  scanf = false
  Log 2, "#{@mid}inject_to_body req: #{msg.req_str}"
  msg.request_headers.each do |a|
   Log 2, "#{@mid}inject_to_body hdr: #{a[0]} #{a[1]}"
   if a.size > 1 and a[0] =~ /content-type/i and a[1] =~ /application\/x-www-form-urlencoded/i
      scanf = true
      break
    end
  end  
  return if not scanf
  m=msg.req_str.match(/\r?\n\r?\n/)
  return if m.size < 1
  start_pos = m.end(0)

  begin
    injs = open_in_path(@config[prop('file')])
    injs.each_line do |l|
      l.chomp!
      next if (l =~ /^#{COMMENT_START}/ or l.length < 1)
      Log 2, "#{@mid}inject_to_body injecting: #{l}"
      pos=start_pos
      while (m=msg.req_str.match(/([^=]+)=([^=]+)/,pos)) 
        req = msg.req_str[0..m.begin(2)-1] + l + msg.req_str[m.end(2)..-1]
        req.sub!(/content-length\s*:\s*\d+/i, "Content-Length: "+(req.length-start_pos).to_s)
        Log 2, "#{@mid}inject_to_body #{pos} #{req}"
        @activity[0]=true
        send_req req, msg.getProtocol, l
        pos=m.end(1)+1
      end
    end
    injs.close
  rescue Exception => e
    Log 0, "#{@mid}inject_to_body Exception: #{e.message}"
    Log 0, e.backtrace.join("\n")
  end
end

#inject_to_pattern ⇒ Object 



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# File 'lib/bscan/modules/injector.rb', line 59

def inject_to_pattern
  param = @config[prop('inject_instead_of')]
  a=[]
  if (not param or (a=param.split(':',3)).size < 3)
      Log 0, "#{@mid}inject_to_pattern: 'inject_instead_of' parameter is not valid #{param}"
      return
  end
  Log 2, "#{@mid}inject_to_pattern input: #{a.join('|')}"
  begin
    p,f,proto = Regexp.escape(a[0]), a[1], a[2]
    file = open_in_path(f)
    req = file.read
    req.gsub!(/\^M\n/,"\r\n")
    file.close

    injs = open_in_path(@config[prop('file')])
    injs.each_line do |l|
      l.chomp!
      next if (l =~ /^#{COMMENT_START}/ or l.length < 1)
      Log 2, "#{@mid}inject_to_pattern injecting: #{l}"

      pos = 0
      while (m=req.match(/(#{p}).*?(#{p})/,pos)) 
        r = (req[0..m.begin(1)-1] + l + req[m.end(2)..-1]).gsub /#{p}(.*?)#{p}/,'\1'

        Log 2, "#{@mid}inject_to_pattern new req:\n#{r}"
        set_len r
        @activity[0]=true
        send_req r,proto,l 
        pos=m.end(1)
      end
    end
    injs.close
    
  rescue Exception => e
      Log 0, "#{@mid}inject_to_pattern Exception: #{e.message}"
      Log 0, e.backtrace.join("\n")
  end
  
end

#run(*args) ⇒ Object 



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# File 'lib/bscan/modules/injector.rb', line 7

def run *args

  @config ||= @bscan_config
  @activity[0]=true

  @prop_pref = 'bscan.injector.'
  @prop_pref += args[2] + '.' if args[2] && args[2].length > 0
  @mid = args[2]?"Injector.#{args[2]}.":'Injector.' 
  msg = args[1]

  if not msg
    inject_to_pattern
    return
  end
  
  url = msg.url.dup.to_s
  Log 2, "#{@mid}run for #{url}"
  begin
    if (url =~ /([^?]+)\?(.+)/)
      beg = "#{$1}?"
      params = $2
      Log 2, "#{@mid}run BEG: #{beg} PARAMS: #{params} FILE: #{@config[prop('file')]}"
      injs = open_in_path(@config[prop('file')])
      injs.each_line do |l|
        l.chomp!
        next if (l =~ /^#{COMMENT_START}/ or l.length < 1)
        Log 2, "#{@mid}run injecting: #{l}"
       
       @activity[0]=true

        do_scan(msg, beg + l, l)       # in parameter name
        do_scan(msg, beg.chop + l, l)  # in  URL
        
        pos=0
        while (m=params.match(/([^&]+)=([^&]+)/,pos)) 
          trg = beg + params[0..m.begin(2)-1] + l + params[m.end(2)..-1]
          @activity[0]=true
          do_scan(msg, trg, l)
          pos=m.end(1)+1
        end
      end
      injs.close
    end
    
    inject_to_body msg if @config['bscan.injector.one.inject_to_body'] == 'true'
    
  rescue Exception => e
    Log 0, "#{@mid}run Exception: #{e.message}"
    Log 0, e.backtrace.join("\n")
 end
end