Class: Yawast::Scanner::Plugins::DNS::Generic

Inherits:
Object
  • Object
show all
Defined in:
lib/scanner/plugins/dns/generic.rb

Class Method Summary collapse

Class Method Details

.dns_info(uri, options) ⇒ Object 



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# File 'lib/scanner/plugins/dns/generic.rb', line 10

def self.dns_info(uri, options)
  begin
    puts 'DNS Information:'
    root_domain = PublicSuffix.parse(uri.host).domain

    dns = Resolv::DNS.new
    Resolv::DNS.open do |resv|
      a = resv.getresources(uri.host, Resolv::DNS::Resource::IN::A)
      unless a.empty?
        a.each do |ip|
          begin
            host_name = dns.getname(ip.address)
          rescue
            host_name = 'N/A'
          end

          Yawast::Utilities.puts_info "\t\t#{ip.address} (#{host_name})"

          Yawast::Shared::Output.log_value 'dns', 'a', ip.address, host_name

          # if address is private, force internal SSL mode, don't show links
          if IPAddr.new(ip.address.to_s, Socket::AF_INET).private?
            options.internalssl = true

            Yawast::Shared::Output.log_value 'force_internal_ssl', true
          else
            #show network info
            Yawast::Utilities.puts_info "\t\t\t#{get_network_info(ip.address)}"

            puts "\t\t\thttps://www.shodan.io/host/#{ip.address}"
            puts "\t\t\thttps://censys.io/ipv4/#{ip.address}"
          end
        end
      end

      aaaa = resv.getresources(uri.host, Resolv::DNS::Resource::IN::AAAA)
      unless aaaa.empty?
        aaaa.each do |ip|
          begin
            host_name = dns.getname(ip.address)
          rescue
            host_name = 'N/A'
          end

          Yawast::Utilities.puts_info "\t\t#{ip.address} (#{host_name})"

          Yawast::Shared::Output.log_value 'dns', 'aaaa', ip.address, host_name

          # if address is private, force internal SSL mode, don't show links
          if IPAddr.new(ip.address.to_s, Socket::AF_INET6).private?
            options.internalssl = true
          else
            #show network info
            Yawast::Utilities.puts_info "\t\t\t#{get_network_info(ip.address)}"

            puts "\t\t\thttps://www.shodan.io/host/#{ip.address.to_s.downcase}"
          end
        end
      end

      txt = resv.getresources(uri.host, Resolv::DNS::Resource::IN::TXT)
      unless txt.empty?
        txt.each do |rec|
          Yawast::Utilities.puts_info "\t\tTXT: #{rec.data}"

          Yawast::Shared::Output.log_append_value 'dns', 'txt', uri.host, rec.data
        end
      end

      #check for higher-level TXT records, if we aren't already at the top
      if root_domain != uri.host
        begin
          txt = resv.getresources(root_domain, Resolv::DNS::Resource::IN::TXT)
          unless txt.empty?
            txt.each do |rec|
              Yawast::Utilities.puts_info "\t\tTXT (#{root_domain}): #{rec.data}"

              Yawast::Shared::Output.log_append_value 'dns', 'txt', root_domain, rec.data
            end
          end
        rescue => e
          Yawast::Utilities.puts_error "\t\tTXT: #{root_domain} (Error: #{e.message})"
        end
      end

      mx = resv.getresources(uri.host, Resolv::DNS::Resource::IN::MX)
      unless mx.empty?
        mx.each do |rec|
          begin
            ip = resv.getaddress rec.exchange

            Yawast::Utilities.puts_info "\t\tMX: #{rec.exchange} (#{rec.preference}) - #{ip} (#{get_network_info(ip.to_s)})"

            Yawast::Shared::Output.log_value 'dns', 'mx', rec.exchange, ip
          rescue => e
            Yawast::Utilities.puts_error "\t\tMX: #{rec.exchange} (#{rec.preference}) - Error: #{e.message})"
          end
        end
      end

      #check for higher-level MX records, if we aren't already at the top
      if root_domain != uri.host
        mx = resv.getresources(root_domain, Resolv::DNS::Resource::IN::MX)
        unless mx.empty?
          mx.each do |rec|
            begin
              ip = resv.getaddress rec.exchange

              Yawast::Utilities.puts_info "\t\tMX (#{root_domain}): #{rec.exchange} (#{rec.preference}) - #{ip} (#{get_network_info(ip.to_s)})"

              Yawast::Shared::Output.log_value 'dns', 'mx', rec.exchange, ip
            rescue => e
              Yawast::Utilities.puts_error "\t\tMX (#{root_domain}): #{rec.exchange} (#{rec.preference}) - Error: #{e.message})"
            end
          end
        end
      end

      ns = resv.getresources(root_domain, Resolv::DNS::Resource::IN::NS)
      unless ns.empty?
        ns.each do |rec|
          ip = resv.getaddress rec.name

          Yawast::Utilities.puts_info "\t\tNS: #{rec.name} - #{ip} (#{get_network_info(ip.to_s)})"

          Yawast::Shared::Output.log_value 'dns', 'ns', rec.name, ip
        end
      end

      if options.srv
        find_srv root_domain, resv
      end

      if options.subdomains
        find_subdomains root_domain, resv
      end
    end

    #get the CAA info - unless it's an IP
    unless IPAddress.valid? uri.host
      Yawast::Scanner::Plugins::DNS::CAA.caa_info uri
    end

    puts
  rescue => e
    Yawast::Utilities.puts_error "Error getting basic information: #{e.message}"
    raise
  end
end

.find_srv(root_domain, resv) ⇒ Object 



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# File 'lib/scanner/plugins/dns/generic.rb', line 160

def self.find_srv(root_domain, resv)
  File.open(File.dirname(__FILE__) + '/../../../resources/srv_list.txt', 'r') do |f|
    f.each_line do |line|
      host = line.strip + '.' + root_domain
      begin
        srv = resv.getresources(host, Resolv::DNS::Resource::IN::SRV)

        unless srv.empty?
          srv.each do |rec|
            ip = resv.getaddress rec.target

            Yawast::Utilities.puts_info "\t\tSRV: #{host}: #{rec.target}:#{rec.port} - #{ip} (#{get_network_info(ip.to_s)})"

            Yawast::Shared::Output.log_value 'dns', 'srv', host, "#{rec.target}:#{rec.port}"
          end
        end
      rescue
        #if this fails, don't really care
      end
    end
  end
end

.find_subdomains(root_domain, resv) ⇒ Object 



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# File 'lib/scanner/plugins/dns/generic.rb', line 183

def self.find_subdomains(root_domain, resv)
  res = Resolver.new()

  File.open(File.dirname(__FILE__) + '/../../../resources/subdomain_list.txt', 'r') do |f|
    f.each_line do |line|
      host = line.strip + '.' + root_domain

      begin
        ## get CNAME records
        cname = res.query(host, 'CNAME')
        if cname.answer[0] != nil
          Yawast::Utilities.puts_info "\t\tCNAME: #{host}: #{cname.answer[0].rdata}"

          Yawast::Shared::Output.log_value 'dns', 'subdomain', host, cname.answer[0].rdata
          next
        end

        ## get A records
        a = resv.getresources(host, Resolv::DNS::Resource::IN::A)

        unless a.empty?
          a.each do |ip|
            if IPAddr.new(ip.address.to_s, Socket::AF_INET).private?
              Yawast::Utilities.puts_info "\t\tA: #{host}: #{ip.address}"
            else
              Yawast::Utilities.puts_info "\t\tA: #{host}: #{ip.address} (#{get_network_info(ip.address)})"
            end

            Yawast::Shared::Output.log_value 'dns', 'subdomain', host, ip.address
          end
        end

        ## get AAAA records
        aaaa = resv.getresources(host, Resolv::DNS::Resource::IN::AAAA)

        unless aaaa.empty?
          aaaa.each do |ip|
            if IPAddr.new(ip.address.to_s, Socket::AF_INET6).private?
              Yawast::Utilities.puts_info "\t\tAAAA: #{host}: #{ip.address}"
            else
              Yawast::Utilities.puts_info "\t\tAAAA: #{host}: #{ip.address} (#{get_network_info(ip.address)})"
            end

            Yawast::Shared::Output.log_value 'dns', 'subdomain', host, ip.address
          end
        end
      rescue
        #if this fails, don't really care
      end
    end
  end
end

.get_network_info(ip) ⇒ Object 



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# File 'lib/scanner/plugins/dns/generic.rb', line 236

def self.get_network_info(ip)
  #check to see if we have this one cached
  @netinfo = Hash.new if @netinfo == nil
  return @netinfo[ip] if @netinfo[ip] != nil

  #check to see if this has failed, if so, skip it. We do this to avoid repeated timeouts if outbound
  #connections are blocked.
  @netinfo_failed = false if @netinfo_failed == nil
  return 'Network Information disabled due to prior failure' if @netinfo_failed

  begin
    network_info = Yawast::Shared::Http.get_json URI("https://api.iptoasn.com/v1/as/ip/#{ip}")

    ret = "#{network_info['as_country_code']} - #{network_info['as_description']}"
    @netinfo[ip] = ret

    Yawast::Shared::Output.log_value 'dns', 'asn_info', ip, ret

    return ret
  rescue => e
    @netinfo_failed = true

    if e.message.include? 'unexpected token'
      # this means that the service returned something invalid, like HTML
      return "Error: getting network information failed (the service returned an unexpected message)"
    else
      return "Error: getting network information failed (#{e.message})"
    end
  end
end