Nmap NSE 6.01: dns-recursion

###############################################################################
# OpenVAS Vulnerability Test
# $Id: gb_nmap6_dns_recursion.nasl 7148 2017-09-15 13:01:14Z cfischer $
#
# Autogenerated NSE wrapper
#
# Authors:
# NSE-Script: Felix Groebert
# NASL-Wrapper: autogenerated
#
# Copyright:
# NSE-Script: The Nmap Security Scanner (http://nmap.org)
# Copyright (C) 2013 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

tag_summary = "Checks if a DNS server allows queries for third-party names. It is expected that recursion will be
enabled on your own internal nameservers.";

if(description)
{
    script_id(803562);
    script_version("$Revision: 7148 $");
    script_tag(name:"cvss_base", value:"5.0");
    script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
    script_tag(name:"last_modification", value:"$Date: 2017-09-15 15:01:14 +0200 (Fri, 15 Sep 2017) $");
    script_tag(name:"creation_date", value:"2013-02-28 19:00:51 +0530 (Thu, 28 Feb 2013)");
    script_name("Nmap NSE 6.01: dns-recursion");


    script_category(ACT_ATTACK);
    script_tag(name:"qod_type", value:"remote_analysis");
    script_copyright("NSE-Script: The Nmap Security Scanner; NASL-Wrapper: Greenbone Networks GmbH");
    script_family("Nmap NSE");



    script_dependencies("toolcheck.nasl");
    script_mandatory_keys("Tools/Present/nmap6.01");
    script_mandatory_keys("Tools/Launch/nmap_nse");

    script_tag(name : "summary" , value : tag_summary);
    exit(0);
}

## DNS Port
port = 53;
if(! get_udp_port_state(port)){
  exit(0);
}

argv = make_list("nmap", "-sU", "--script=dns-recursion.nse",
                                         "-p", port, get_host_ip());

## Run nmap and Get the Result
res = pread(cmd: "nmap", argv: argv);

if(res)
{
  foreach line (split(res))
  {
    if(ereg(pattern:"^\|",string:line)) {
      result +=  substr(chomp(line),2) + '\n';
    }

    error = eregmatch(string:line, pattern:"^nmap: (.*)$");
    if (error) {
      msg = string('Nmap command failed with following error message:\n', line);
      log_message(data : msg, port:port);
    }
  }

  if("dns-recursion" >< result) {
    msg = string('Result found by Nmap Security Scanner (dns-recursion.nse) ',
                'http://nmap.org:\n\n', result);
    security_message(data : msg, port:port);
  }
}
else
{
  msg = string('Nmap command failed entirely:\n', 'nmap ', argv);
  log_message(data: msg, port:port);
}