ospd_openvas.wrapper

Complexity

Total Complexity

160

Size/Duplication

Total Lines	1167
Duplicated Lines	81.75 %

Importance

Changes

0

36 Methods

Rating	Name	Duplication	Size	Complexity
A	OSPDopenvas.get_modification_time_vt_as_xml_str()	12	12	1
C	OSPDopenvas.build_credentials_as_prefs()	73	73	7
A	OSPDopenvas.scan_is_stopped()	9	9	1
A	OSPDopenvas.get_detection_vt_as_xml_str()	22	22	4
A	OSPDopenvas.scheduler()	3	3	1
A	OSPDopenvas.get_summary_vt_as_xml_str()	12	12	1
A	OSPDopenvas.get_insight_vt_as_xml_str()	12	12	1
B	OSPDopenvas.get_refs_vt_as_xml_str()	32	32	8
A	OSPDopenvas.get_openvas_timestamp_scan_host()	12	12	3
A	OSPDopenvas.get_solution_vt_as_xml_str()	15	15	2
F	OSPDopenvas.exec_scan()	154	154	19
A	OSPDopenvas.stop_scan()	19	19	3
A	OSPDopenvas.get_custom_vt_as_xml_str()	16	16	2
A	OSPDopenvas.get_severity_score()	17	17	3
A	OSPDopenvas.get_vt_param_type()	6	6	2
A	OSPDopenvas.get_impact_vt_as_xml_str()	13	13	1
A	OSPDopenvas.check()	22	22	4
B	OSPDopenvas.check_param_type()	22	22	8
A	OSPDopenvas.get_severities_vt_as_xml_str()	19	19	4
B	OSPDopenvas.get_vts_in_groups()	21	21	6
A	OSPDopenvas.get_params_vt_as_xml_str()	22	22	3
A	OSPDopenvas.update_progress()	21	21	3
A	OSPDopenvas.get_dependencies_vt_as_xml_str()	21	21	3
C	OSPDopenvas.get_openvas_result()	59	59	8
A	OSPDopenvas.get_openvas_status()	10	10	2
F	OSPDopenvas.load_vts()	93	93	18
B	OSPDopenvas.process_vts()	29	29	7
A	OSPDopenvas.get_affected_vt_as_xml_str()	12	12	1
A	OSPDopenvas.scan_is_finished()	4	4	1
C	OSPDopenvas.check_feed()	30	30	10
A	OSPDopenvas.get_creation_time_vt_as_xml_str()	12	12	1
A	OpenVasVtsFilter.format_vt_modification_time()	10	10	1
A	OSPDopenvas.feed_is_outdated()	21	21	5
A	OSPDopenvas.redis_nvticache_init()	8	8	2
A	OSPDopenvas.__init__()	26	26	3
B	OSPDopenvas.parse_param()	22	22	8

# -*- coding: utf-8 -*-
# Copyright (C) 2018 Greenbone Networks GmbH
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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

""" Setup for the OSP OpenVAS Server. """

import subprocess
import time
import signal
import uuid
from lxml.etree import tostring, SubElement, Element
from datetime import datetime
import psutil
from os import path

from ospd.ospd import OSPDaemon, logger
from ospd.misc import main as daemon_main
from ospd.misc import target_str_to_list
from ospd.cvss import CVSS
from ospd.vtfilter import VtsFilter
from ospd_openvas import __version__
from ospd_openvas.errors import OSPDOpenvasError

from ospd_openvas.nvticache import NVTICache
from ospd_openvas.db import OpenvasDB

OSPD_DESC = """
This scanner runs 'OpenVAS Scanner' to scan the target hosts.

OpenVAS (Open Vulnerability Assessment System) is a powerful scanner
for vulnerabilities in IT infrastrucutres. The capabilities include
unauthzenticated scanning as well as authneticated scanning for
various types of systems and services.

For more details about OpenVAS see the OpenVAS homepage:
http://www.openvas.org/

The current version of ospd-openvas is a simple frame, which sends
the server parameters to the Greenbone Vulnerability Manager (GVM) and checks
the existence of OpenVAS Scanner binary. But it can not run scans yet.
"""

OSPD_PARAMS = {
    'auto_enable_dependencies': {
        'type': 'boolean',
        'name': 'auto_enable_dependencies',
        'default': 1,
        'mandatory': 1,
        'description': 'Automatically enable the plugins that are depended on',
    },
    'cgi_path': {
        'type': 'string',
        'name': 'cgi_path',
        'default': '/cgi-bin:/scripts',
        'mandatory': 1,
        'description': 'Look for default CGIs in /cgi-bin and /scripts',
    },
    'checks_read_timeout': {
        'type': 'integer',
        'name': 'checks_read_timeout',
        'default': 5,
        'mandatory': 1,
        'description': ('Number  of seconds that the security checks will ' +
                        'wait for when doing a recv()'),
    },
    'drop_privileges': {
        'type': 'boolean',
        'name': 'drop_privileges',
        'default': 0,
        'mandatory': 1,
        'description': '',
    },
    'network_scan': {
        'type': 'boolean',
        'name': 'network_scan',
        'default': 0,
        'mandatory': 1,
        'description': '',
    },
    'non_simult_ports': {
        'type': 'string',
        'name': 'non_simult_ports',
        'default': '139, 445, 3389, Services/irc',
        'mandatory': 1,
        'description': ('Prevent to make two connections on the same given ' +
                        'ports at the same time.'),
    },
    'open_sock_max_attempts': {
        'type': 'integer',
        'name': 'open_sock_max_attempts',
        'default': 5,
        'mandatory': 0,
        'description': ('Number of unsuccessful retries to open the socket ' +
                        'before to set the port as closed.'),
    },
    'timeout_retry': {
        'type': 'integer',
        'name': 'timeout_retry',
        'default': 5,
        'mandatory': 0,
        'description': ('Number of retries when a socket connection attempt ' +
                        'timesout.'),
    },
    'optimize_test': {
        'type': 'integer',
        'name': 'optimize_test',
        'default': 5,
        'mandatory': 0,
        'description': ('By default, openvassd does not trust the remote ' +
                        'host banners.'),
    },
    'plugins_timeout': {
        'type': 'integer',
        'name': 'plugins_timeout',
        'default': 5,
        'mandatory': 0,
        'description': 'This is the maximum lifetime, in seconds of a plugin.',
    },
    'report_host_details': {
        'type': 'boolean',
        'name': 'report_host_details',
        'default': 1,
        'mandatory': 1,
        'description': '',
    },
    'safe_checks': {
        'type': 'boolean',
        'name': 'safe_checks',
        'default': 1,
        'mandatory': 1,
        'description': ('Disable the plugins with potential to crash ' +
                        'the remote services'),
    },
    'scanner_plugins_timeout': {
        'type': 'integer',
        'name': 'scanner_plugins_timeout',
        'default': 36000,
        'mandatory': 1,
        'description': 'Like plugins_timeout, but for ACT_SCANNER plugins.',
    },
    'time_between_request': {
        'type': 'integer',
        'name': 'time_between_request',
        'default': 0,
        'mandatory': 0,
        'description': ('Allow to set a wait time between two actions ' +
                        '(open, send, close).'),
    },
    'unscanned_closed': {
        'type': 'boolean',
        'name': 'unscanned_closed',
        'default': 1,
        'mandatory': 1,
        'description': '',
    },
    'unscanned_closed_udp': {
        'type': 'boolean',
        'name': 'unscanned_closed_udp',
        'default': 1,
        'mandatory': 1,
        'description': '',
    },
    'use_mac_addr': {
        'type': 'boolean',
        'name': 'use_mac_addr',
        'default': 0,
        'mandatory': 0,
        'description': 'To test the local network. ' +
                       'Hosts will be referred to by their MAC address.',
    },
    'vhosts': {
        'type': 'string',
        'name': 'vhosts',
        'default': '',
        'mandatory': 0,
        'description': '',
    },
    'vhosts_ip': {
        'type': 'string',
        'name': 'vhosts_ip',
        'default': '',
        'mandatory': 0,
        'description': '',
    },
}


def _from_bool_to_str(value):
    """ The OpenVAS scanner use yes and no as boolean values, whereas ospd
    uses 1 and 0."""
    return 'yes' if value == 1 else 'no'

class OpenVasVtsFilter(VtsFilter):

This code seems to be duplicated in your project.

    """ Methods to overwrite the ones in the original class.
    Each method formats the value to be compatible with the filter
    """
    def format_vt_modification_time(self, value):
        """ Convert the datetime value in an 19 character string
        representing YearMonthDateHourMinuteSecond.
        e.g. 20190319122532
        """

        date = value[7:26].replace(" ", "")
        date = date.replace("-", "")
        date = date.replace(":","")
        return date

class OSPDopenvas(OSPDaemon):

This code seems to be duplicated in your project.

    """ Class for ospd-openvas daemon. """

    def __init__(self, certfile, keyfile, cafile):
        """ Initializes the ospd-openvas daemon's internal data. """

        super().__init__(certfile=certfile, keyfile=keyfile, cafile=cafile,
                         customvtfilter=OpenVasVtsFilter())
        self.server_version = __version__
        self.scanner_info['name'] = 'openvassd'
        self.scanner_info['version'] = ''  # achieved during self.check()
        self.scanner_info['description'] = OSPD_DESC
        for name, param in OSPD_PARAMS.items():
            self.add_scanner_param(name, param)

        self.scan_only_params = dict()
        self.main_kbindex = None
        self.openvas_db = OpenvasDB()
        self.nvti = NVTICache(self.openvas_db)

        self.openvas_db.db_init()

        self.pending_feed = None
        ctx = self.openvas_db.db_find(self.nvti.NVTICACHE_STR)
        if not ctx:
            self.redis_nvticache_init()
            ctx = self.openvas_db.db_find(self.nvti.NVTICACHE_STR)
        self.openvas_db.set_redisctx(ctx)
        self.load_vts()

    def parse_param(self):
        """ Set OSPD_PARAMS with the params taken from the openvas_scanner. """
        global OSPD_PARAMS
        bool_dict = {'no': 0, 'yes': 1}

        result = subprocess.check_output(['openvassd', '-s'],
                                         stderr=subprocess.STDOUT)
        result = result.decode('ascii')
        param_list = dict()
        for conf in result.split('\n'):
            elem = conf.split('=')
            if len(elem) == 2:
                value = str.strip(elem[1])
                if str.strip(elem[1]) in bool_dict:
                    value = bool_dict[value]
                param_list[str.strip(elem[0])] = value
        for elem in OSPD_PARAMS:
            if elem in param_list:
                OSPD_PARAMS[elem]['default'] = param_list[elem]
        for elem in param_list:
            if elem not in OSPD_PARAMS:
                self.scan_only_params[elem] = param_list[elem]

    def redis_nvticache_init(self):
        """ Loads NVT's metadata into Redis DB. """
        try:
            logger.debug('Loading NVTs in Redis DB')
            subprocess.check_call(['openvassd', '-C'])
        except subprocess.CalledProcessError as err:
            logger.error('OpenVAS Scanner failed to load NVTs.')
            raise err

    def feed_is_outdated(self):
        """ Compare the current feed with the one in the disk.

        Return:
            False if there is no new feed. True if the feed version in disk
            is newer than the feed in redis cache.
        """
        plugins_folder = self.scan_only_params.get('plugins_folder')
        if not plugins_folder:
            raise OSPDOpenvasError("Error: Path to plugins folder not found.")
        feed_info_file = path.join(plugins_folder, 'plugin_feed_info.inc')
        fcontent = open(feed_info_file)
        for line in fcontent:
            if "PLUGIN_SET" in line:
                date = line.split(' = ')[1]
                date = date.replace(';', '')
                date = date.replace('"', '')
        current_feed =  self.nvti.get_feed_version()
        if int(current_feed) < int(date):

The variable date does not seem to be defined for all execution paths.

            return True
        return False

    def check_feed(self):
        """ Check if there is a feed update. Wait until all the running
        scans finished. Set a flag to anounce there is a pending feed update,
        which avoid to start a new scan.
        """

        # Check if the nvticache in redis is outdated
        if self.feed_is_outdated():
            self.redis_nvticache_init()

        _running_scan = False
        for scan_id in self.scan_processes:
            if self.scan_processes[scan_id].is_alive():
                _running_scan = True

        # Check if the NVT dict is outdated
        if self.pending_feed:
            _pending_feed = True
        else:
            _pending_feed = self.get_vts_version() != self.nvti.get_feed_version()

        if _running_scan and _pending_feed:
            if not self.pending_feed:
                self.pending_feed = True
                logger.debug(
                    'There is a running scan. Therefore the feed '
                    'update will be performed later.')
        elif not _running_scan and _pending_feed:
            self.vts = dict()
            self.load_vts()

    def scheduler(self):
        """This method is called periodically to run tasks."""
        self.check_feed()

    def load_vts(self):
        """ Load the NVT's metadata into the vts
        global  dictionary. """
        logger.debug('Loading vts in memory.')
        oids = dict(self.nvti.get_oids())
        for filename, vt_id in oids.items():
            _vt_params = self.nvti.get_nvt_params(vt_id)
            _vt_refs = self.nvti.get_nvt_refs(vt_id)
            _custom = self.nvti.get_nvt_metadata(vt_id)
            _name = _custom.pop('name')
            _vt_creation_time = _custom.pop('creation_date')
            _vt_modification_time = _custom.pop('last_modification')

            _summary = None
            _impact = None
            _affected = None
            _insight = None
            _solution = None
            _solution_t = None
            _vuldetect = None
            _qod_t = None
            _qod_v = None

            if 'summary' in _custom:
                _summary = _custom.pop('summary')
            if 'impact' in _custom:
                _impact = _custom.pop('impact')
            if 'affected' in _custom:
                _affected = _custom.pop('affected')
            if 'insight' in _custom :
                _insight = _custom.pop('insight')
            if 'solution' in _custom:
                _solution = _custom.pop('solution')
                if 'solution_type' in _custom:
                    _solution_t = _custom.pop('solution_type')

            if 'vuldetect' in _custom:
                _vuldetect  = _custom.pop('vuldetect')
            if 'qod_type' in _custom:
                _qod_t  = _custom.pop('qod_type')
            elif 'qod' in _custom:
                _qod_v  = _custom.pop('qod')

            _severity = dict()
            if 'severity_base_vector' in _custom:
                _severity_vector = _custom.pop('severity_base_vector')
            else:
                _severity_vector = _custom.pop('cvss_base_vector')
            _severity['severity_base_vector'] = _severity_vector
            if 'severity_type' in _custom:
                _severity_type = custom.pop('severity_type')

The variable custom does not seem to be defined.

            else:
                _severity_type = 'cvss_base_v2'
            _severity['severity_type'] = _severity_type
            if 'severity_origin' in _custom:
                _severity['severity_origin'] = _custom.pop('severity_origin')

            _vt_dependencies = list()
            if 'dependencies' in _custom:
                _deps = _custom.pop('dependencies')
                _deps_list = _deps.split(', ')
                for dep in _deps_list:
                    _vt_dependencies.append(oids.get('filename:' + dep))

            ret = self.add_vt(
                vt_id,
                name=_name,
                vt_params=_vt_params,
                vt_refs=_vt_refs,
                custom=_custom,
                vt_creation_time=_vt_creation_time,
                vt_modification_time=_vt_modification_time,
                vt_dependencies=_vt_dependencies,
                summary=_summary,
                impact=_impact,
                affected=_affected,
                insight=_insight,
                solution=_solution,
                solution_t=_solution_t,
                detection=_vuldetect,
                qod_t=_qod_t,
                qod_v=_qod_v,
                severities=_severity
            )
            if ret == -1:
                logger.info("Dupplicated VT with OID: {0}".format(vt_id))
            if ret == -2:
                logger.info("{0}: Invalid OID.".format(vt_id))

        _feed_version = self.nvti.get_feed_version()
        self.set_vts_version(vts_version=_feed_version)
        self.pending_feed = False
        logger.debug('Finish loading up vts.')

    @staticmethod
    def get_custom_vt_as_xml_str(vt_id, custom):
        """ Return an xml element with custom metadata formatted as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            custom (dict): Dictionary with the custom metadata.
        Return:
            string: xml element as string.
        """

        _custom = Element('custom')
        for key, val in custom.items():
            xml_key = SubElement(_custom, key)
            xml_key.text = val

        return tostring(_custom).decode('utf-8')

    @staticmethod
    def get_severities_vt_as_xml_str(vt_id, severities):
        """ Return an xml element with severities as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            severities (dict): Dictionary with the severities.
        Return:
            string: xml element as string.
        """
        _severities = Element('severities')
        _severity = SubElement(_severities, 'severity')
        if 'severity_base_vector' in severities:
            _severity.text = severities.get('severity_base_vector')
        if 'severity_origin' in severities:
            _severity.set('origin', severities.get('severity_origin'))
        if 'severity_type' in severities:
            _severity.set('type', severities.get('severity_type'))

        return tostring(_severities).decode('utf-8')

    @staticmethod
    def get_params_vt_as_xml_str(vt_id, vt_params):
        """ Return an xml element with params formatted as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            vt_params (dict): Dictionary with the VT parameters.
        Return:
            string: xml element as string.
        """
        vt_params_xml = Element('vt_params')
        for pref_name, prefs in vt_params.items():
            vt_param = Element('vt_param')
            vt_param.set('type', prefs['type'])
            vt_param.set('id', prefs['id'])
            xml_name = SubElement(vt_param, 'name')
            xml_name.text = prefs['name']
            if prefs['default']:
                xml_def = SubElement(vt_param, 'default')
                xml_def.text = prefs['default']
            vt_params_xml.append(vt_param)

        return tostring(vt_params_xml).decode('utf-8')

    @staticmethod
    def get_refs_vt_as_xml_str(vt_id, vt_refs):
        """ Return an xml element with references formatted as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            vt_refs (dict): Dictionary with the VT references.
        Return:
            string: xml element as string.
        """
        vt_refs_xml = Element('refs')
        for ref_type, ref_values in vt_refs.items():
            for value in ref_values:
                vt_ref = Element('ref')
                if ref_type == "xref" and value:
                    for xref in value.split(', '):
                        try:
                            _type, _id = xref.split(':', 1)
                        except ValueError:
                            logger.error(
                                'Not possible to parse xref %s for vt %s' % (
                                    xref, vt_id))
                            continue
                        vt_ref.set('type', _type.lower())
                        vt_ref.set('id', _id)
                elif value:
                    vt_ref.set('type', ref_type.lower())
                    vt_ref.set('id', value)
                else:
                    continue
                vt_refs_xml.append(vt_ref)

        return tostring(vt_refs_xml).decode('utf-8')

    @staticmethod
    def get_dependencies_vt_as_xml_str(vt_id, dep_list):
        """ Return  an xml element with dependencies as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            dep_list (List): List with the VT dependencies.
        Return:
            string: xml element as string.
        """
        vt_deps_xml = Element('dependencies')
        for dep in dep_list:
            _vt_dep = Element('dependency')
            try:
                _vt_dep.set('vt_id', dep)
            except TypeError:
                logger.error('Not possible to add dependency %s for vt %s' % (
                    dep, vt_id))
                continue
            vt_deps_xml.append(_vt_dep)

        return tostring(vt_deps_xml).decode('utf-8')

    @staticmethod
    def get_creation_time_vt_as_xml_str(vt_id, creation_time):
        """ Return creation time as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            creation_time (str): String with the VT creation time.
        Return:
            string: xml element as string.
        """
        _time = Element('creation_time')
        _time.text = creation_time
        return tostring(_time).decode('utf-8')

    @staticmethod
    def get_modification_time_vt_as_xml_str(vt_id, modification_time):
        """ Return modification time as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            modification_time (str): String with the VT modification time.
        Return:
            string: xml element as string.
        """
        _time = Element('modification_time')
        _time.text = modification_time
        return tostring(_time).decode('utf-8')

    @staticmethod
    def get_summary_vt_as_xml_str(vt_id, summary):
        """ Return summary as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            summary (str): String with a VT summary.
        Return:
            string: xml element as string.
        """
        _summary = Element('summary')
        _summary.text = summary
        return tostring(_summary).decode('utf-8')

    @staticmethod
    def get_impact_vt_as_xml_str(vt_id, impact):
        """ Return impact as string.

        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            impact (str): String which explain the vulneravility impact.
        Return:
            string: xml element as string.
        """
        _impact = Element('impact')
        _impact.text = impact
        return tostring(_impact).decode('utf-8')

    @staticmethod
    def get_affected_vt_as_xml_str(vt_id, affected):
        """ Return affected as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            affected (str): String which explain what is affected.
        Return:
            string: xml element as string.
        """
        _affected = Element('affected')
        _affected.text = affected
        return tostring(_affected).decode('utf-8')

    @staticmethod
    def get_insight_vt_as_xml_str(vt_id, insight):
        """ Return insight as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            insight (str): String giving an insight of the vulnerability.
        Return:
            string: xml element as string.
        """
        _insight = Element('insight')
        _insight.text = insight
        return tostring(_insight).decode('utf-8')

    @staticmethod
    def get_solution_vt_as_xml_str(vt_id, solution, solution_type=None):
        """ Return solution as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            solution (str): String giving a possible solution.
            solution_type (str): A solution type
        Return:
            string: xml element as string.
        """
        _solution = Element('solution')
        _solution.text = solution
        if solution_type:
            _solution.set('type', solution_type)
        return tostring(_solution).decode('utf-8')

    @staticmethod
    def get_detection_vt_as_xml_str(vt_id, vuldetect=None,
                                    qod_type=None, qod=None):
        """ Return detection as string.
        Arguments:
            vt_id (str): VT OID. Only used for logging in error case.
            vuldetect (str, opt): String which explain how the vulnerability
                was detected.
            qod_type (str, opt): qod type.
            qod (str, opt): qod value.
        Return:
            string: xml element as string.
        """
        _detection = Element('detection')
        if vuldetect:
            _detection.text = vuldetect
        if qod_type:
            _detection.set('qod_type', qod_type)
        elif qod:
            _detection.set('qod', qod)

        return tostring(_detection).decode('utf-8')

    def check(self):
        """ Checks that openvassd command line tool is found and
        is executable. """
        try:
            result = subprocess.check_output(['openvassd', '-V'],
                                             stderr=subprocess.STDOUT)
            result = result.decode('ascii')
        except OSError:
            # The command is not available
            return False

        if result is None:
            return False

        version = result.split('\n')
        if version[0].find('OpenVAS') < 0:
            return False

        self.parse_param()
        self.scanner_info['version'] = version[0]

        return True

    def update_progress(self, scan_id, target, msg):
        """ Calculate percentage and update the scan status of a target
        for the progress bar.
        Arguments:
            scan_id (uuid): Scan ID to identify the current scan process.
            target (str): Target to be updated with the calculated
                          scan progress.
            msg (str): String with launched and total plugins.
        """
        host_progress_dict = dict()
        try:
            launched, total = msg.split('/')
        except ValueError:
            return
        if float(total) == 0:
            return
        host_prog = (float(launched) / float(total)) * 100
        host_progress_dict[target] = host_prog
        total_host = len(target_str_to_list(target))
        target_progress = sum(host_progress_dict.values()) / total_host
        self.set_scan_target_progress(scan_id, target, target_progress)

    def get_openvas_status(self, scan_id, target):
        """ Get all status entries from redis kb.
        Arguments:
            scan_id (uuid): Scan ID to identify the current scan.
            target (str): Target progress to be updated.
        """
        res = self.openvas_db.get_status()
        while res:
            self.update_progress(scan_id, target, res)
            res = self.openvas_db.get_status()

    def get_severity_score(self, oid):
        """ Return the severity score for the given oid.
        Arguments:
            oid (str): VT OID from which to get the severity vector
        Returns:
            The calculated cvss base value. None if there is no severity
            vector or severity type is not cvss base version 2.
        """
        severity_type = (
            self.vts[oid]['severities'].get('severity_type'))
        severity_vector = (
            self.vts[oid]['severities'].get('severity_base_vector'))

        if severity_type == "cvss_base_v2" and severity_vector:
            return CVSS.cvss_base_v2_value(severity_vector)

        return None

    def get_openvas_result(self, scan_id):
        """ Get all result entries from redis kb. """
        res = self.openvas_db.get_result()
        while res:
            msg = res.split('|||')
            host_aux = self.openvas_db.get_single_item('internal/ip')
            roid = msg[3]

            rqod = ''
            if self.vts[roid].get('qod_type'):
                qod_t = self.vts[roid].get('qod_type')
                rqod = self.nvti.QoD_TYPES[qod_t]
            elif self.vts[roid].get('qod'):
                rqod = self.vts[roid].get('qod')

            rname = self.vts[roid].get('name')

            if msg[0] == 'ERRMSG':
                self.add_scan_error(
                    scan_id,
                    host=host_aux,
                    name=rname,
                    value=msg[4],
                    port=msg[2],
                )

            if msg[0] == 'LOG':
                self.add_scan_log(
                    scan_id,
                    host=host_aux,
                    name=rname,
                    value=msg[4],
                    port=msg[2],
                    qod=rqod,
                    test_id=roid,
                )

            if msg[0] == 'HOST_DETAIL':
                self.add_scan_host_detail(
                    scan_id,
                    host=host_aux,
                    name=rname,
                    value=msg[4],
                )

            if msg[0] == 'ALARM':
                rseverity = self.get_severity_score(roid)
                self.add_scan_alarm(
                    scan_id,
                    host=host_aux,
                    name=rname,
                    value=msg[4],
                    port=msg[2],
                    test_id=roid,
                    severity=rseverity,
                    qod=rqod,
                )

            res = self.openvas_db.get_result()

    def get_openvas_timestamp_scan_host(self, scan_id, target):
        """ Get start and end timestamp of a host scan from redis kb. """
        timestamp = self.openvas_db.get_host_scan_scan_end_time()
        if timestamp:
            self.add_scan_log(scan_id, host=target, name='HOST_END',
                              value=timestamp)
            return
        timestamp = self.openvas_db.get_host_scan_scan_start_time()
        if timestamp:
            self.add_scan_log(scan_id, host=target, name='HOST_START',
                              value=timestamp)
            return

    def scan_is_finished(self, scan_id):
        """ Check if the scan has finished. """
        status = self.openvas_db.get_single_item('internal/%s' % scan_id)
        return status == 'finished'

    def scan_is_stopped(self, scan_id):
        """ Check if the parent process has received the stop_scan order.
        @in scan_id: ID to identify the scan to be stopped.
        @return 1 if yes, None in other case.
        """
        ctx = self.openvas_db.kb_connect(dbnum=self.main_kbindex)
        self.openvas_db.set_redisctx(ctx)
        status = self.openvas_db.get_single_item('internal/%s' % scan_id)
        return status == 'stop_all'

    def stop_scan(self, global_scan_id):
        """ Set a key in redis to indicate the wrapper is stopped.
        It is done through redis because it is a new multiprocess
        instance and it is not possible to reach the variables
        of the grandchild process. Send SIGUSR2 to openvas to stop
        each running scan."""
        ctx = self.openvas_db.kb_connect()
        for current_kbi in range(0, self.openvas_db.max_dbindex):
            self.openvas_db.select_kb(ctx, str(current_kbi), set_global=True)
            scan_id = self.openvas_db.get_single_item(
                'internal/%s/globalscanid' % global_scan_id)
            if scan_id:
                self.openvas_db.set_single_item('internal/%s' % scan_id,
                                           ['stop_all', ])
                ovas_pid = self.openvas_db.get_single_item('internal/ovas_pid')
                parent = psutil.Process(int(ovas_pid))
                self.openvas_db.release_db(current_kbi)
                parent.send_signal(signal.SIGUSR2)
                logger.debug('Stopping process: {0}'.format(parent))

    def get_vts_in_groups(self, filters):
        """ Return a list of vts which match with the given filter.

        @input filters A list of filters. Each filter has key, operator and
                       a value. They are separated by a space.
                       Supported keys: family
        @return Return a list of vts which match with the given filter.
        """
        vts_list = list()
        families = dict()
        for oid in self.vts:
            family = self.vts[oid]['custom'].get('family')
            if family not in families:
                families[family] = list()
            families[family].append(oid)

        for elem in filters:
            key, value = elem.split('=')
            if key == 'family' and value in families:
                vts_list.extend(families[value])
        return vts_list

    def get_vt_param_type(self, vtid, vt_param_id):
        """ Return the type of the vt parameter from the vts dictionary. """
        vt_params_list = self.vts[vtid].get("vt_params")
        if vt_params_list.get(vt_param_id):
            return vt_params_list[vt_param_id]["type"]
        return False

    @staticmethod
    def check_param_type(vt_param_value, param_type):
        """ Check if the value of a vt parameter matches with
        the type founded.
        """
        if (param_type in ['entry',
                           'file',
                           'password',
                           'radio',
                           'sshlogin', ] and isinstance(vt_param_value, str)):
            return None
        elif (param_type == 'checkbox' and
              (vt_param_value == 'yes' or vt_param_value == 'no')):
            return None
        elif param_type == 'integer':
            try:
                int(vt_param_value)
            except ValueError:
                return 1
            return None

        return 1

    def process_vts(self, vts):
        """ Add single VTs and their parameters. """
        vts_list = []
        vts_params = []
        vtgroups = vts.pop('vt_groups')

        if vtgroups:
            vts_list = self.get_vts_in_groups(vtgroups)

        for vtid, vt_params in vts.items():
            vts_list.append(vtid)
            for vt_param_id, vt_param_value in vt_params.items():
                param_type = self.get_vt_param_type(vtid, vt_param_id)
                if not param_type:
                    logger.debug('The vt parameter %s for %s could not be loaded.',
                                 vt_param_id, vtid)
                    continue
                if vt_param_id == 'timeout':
                    type_aux = 'integer'
                else:
                    type_aux = param_type
                if self.check_param_type(vt_param_value, type_aux):
                    logger.debug('Expected {} type for parameter value {}'
                                 .format(type_aux, str(vt_param_value)))
                param = ["{0}:{1}:{2}".format(vtid, param_type,
                                               vt_param_id),
                         str(vt_param_value)]
                vts_params.append(param)
        return vts_list, vts_params

    @staticmethod
    def build_credentials_as_prefs(credentials):
        """ Parse the credential dictionary.
        @param credentials: Dictionary with the credentials.

        @return A list with the credentials in string format to be
                added to the redis KB.
        """
        cred_prefs_list = []
        for credential in credentials.items():
            service = credential[0]
            cred_params = credentials.get(service)
            cred_type = cred_params.get('type', '')
            username = cred_params.get('username', '')
            password = cred_params.get('password', '')

            if service == 'ssh':
                port = cred_params.get('port', '')
                cred_prefs_list.append('auth_port_ssh|||' +
                                       '{0}'.format(port))
                cred_prefs_list.append('SSH Authorization[entry]:SSH login ' +
                                       'name:|||{0}'.format(username))
                if cred_type == 'up':
                    cred_prefs_list.append('SSH Authorization[password]:' +
                                           'SSH password (unsafe!):|||' +
                                           '{0}'.format(password))
                else:
                    private = cred_params.get('private', '')
                    cred_prefs_list.append('SSH Authorization[password]:' +
                                           'SSH key passphrase:|||' +
                                           '{0}'.format(password))
                    cred_prefs_list.append('SSH Authorization[file]:' +
                                           'SSH private key:|||' +
                                           '{0}'.format(private))
            if service == 'smb':
                cred_prefs_list.append('SMB Authorization[entry]:SMB login:' +
                                       '|||{0}'.format(username))
                cred_prefs_list.append('SMB Authorization[password]:' +
                                       'SMB password :|||' +
                                       '{0}'.format(password))
            if service == 'esxi':
                cred_prefs_list.append('ESXi Authorization[entry]:ESXi login ' +
                                       'name:|||{0}'.format(username))
                cred_prefs_list.append('ESXi Authorization[password]:' +
                                       'ESXi login password:|||' +
                                       '{0}'.format(password))

            if service == 'snmp':
                community = cred_params.get('community', '')
                auth_algorithm = cred_params.get('auth_algorithm', '')
                privacy_password = cred_params.get('privacy_password', '')
                privacy_algorithm = cred_params.get('privacy_algorithm', '')

                cred_prefs_list.append('SNMP Authorization[password]:' +
                                       'SNMP Community:' +
                                       '{0}'.format(community))
                cred_prefs_list.append('SNMP Authorization[entry]:' +
                                       'SNMPv3 Username:' +
                                       '{0}'.format(username))
                cred_prefs_list.append('SNMP Authorization[password]:' +
                                       'SNMPv3 Password:' +
                                       '{0}'.format(password))
                cred_prefs_list.append('SNMP Authorization[radio]:' +
                                       'SNMPv3 Authentication Algorithm:' +
                                       '{0}'.format(auth_algorithm))
                cred_prefs_list.append('SNMP Authorization[password]:' +
                                       'SNMPv3 Privacy Password:' +
                                       '{0}'.format(privacy_password))
                cred_prefs_list.append('SNMP Authorization[radio]:' +
                                       'SNMPv3 Privacy Algorithm:' +
                                       '{0}'.format(privacy_algorithm))

        return cred_prefs_list

    def exec_scan(self, scan_id, target):
        """ Starts the OpenVAS scanner for scan_id scan. """
        if self.pending_feed:
            logger.info(
                '%s: There is a pending feed update. '
                'The scan can not be started.' % scan_id)
            self.add_scan_error(
                scan_id, name='', host=target,
                value=('It was not possible to start the scan,'
                'because a pending feed update. Please try later'))
            return 2

        ports = self.get_scan_ports(scan_id, target)
        if not ports:
            self.add_scan_error(scan_id, name='', host=target,
                                value='No port list defined.')
            return 2

        # Get scan options
        options = self.get_scan_options(scan_id)
        prefs_val = []
        ctx = self.openvas_db.kb_new()
        self.openvas_db.set_redisctx(ctx)
        self.main_kbindex = self.openvas_db.db_index

        # To avoid interference between scan process during a parallel scanning
        # new uuid is used internally for each scan.
        openvas_scan_id = str(uuid.uuid4())
        self.openvas_db.add_single_item(
            'internal/%s' % openvas_scan_id, ['new'])
        self.openvas_db.add_single_item(
            'internal/%s/globalscanid' % scan_id, [openvas_scan_id])

        # Set scan preferences
        for key, value in options.items():
            item_type = ''
            if key in OSPD_PARAMS:
                item_type = OSPD_PARAMS[key].get('type')
            if item_type == 'boolean':
                val =  _from_bool_to_str(value)
            else:
                val = str(value)
            prefs_val.append(key + "|||" + val)
        self.openvas_db.add_single_item(
            'internal/%s/scanprefs' % openvas_scan_id, prefs_val)

        # Store main_kbindex as global preference
        ov_maindbid = ('ov_maindbid|||%d' % self.main_kbindex)
        self.openvas_db.add_single_item(
            'internal/%s/scanprefs' % openvas_scan_id, [ov_maindbid])

        # Set target
        target_aux = ('TARGET|||%s' % target)
        self.openvas_db.add_single_item(
            'internal/%s/scanprefs' % openvas_scan_id, [target_aux])
        # Set port range
        port_range = ('port_range|||%s' % ports)
        self.openvas_db.add_single_item(
            'internal/%s/scanprefs' % openvas_scan_id, [port_range])

        # Set credentials
        credentials = self.get_scan_credentials(scan_id, target)
        if credentials:
            cred_prefs = self.build_credentials_as_prefs(credentials)
            self.openvas_db.add_single_item(
                'internal/%s/scanprefs' % openvas_scan_id, cred_prefs)

        # Set plugins to run
        nvts = self.get_scan_vts(scan_id)
        if nvts != '':
            nvts_list, nvts_params = self.process_vts(nvts)
            # Add nvts list
            separ = ';'
            plugin_list = 'plugin_set|||%s' % separ.join(nvts_list)
            self.openvas_db.add_single_item(
                'internal/%s/scanprefs' % openvas_scan_id, [plugin_list])
            # Add nvts parameters
            for elem in nvts_params:
                item = '%s|||%s' % (elem[0], elem[1])
                self.openvas_db.add_single_item(
                    'internal/%s/scanprefs' % openvas_scan_id, [item])
        else:
            self.openvas_db.release_db(self.main_kbindex)
            self.add_scan_error(scan_id, name='', host=target,
                                value='No VTS to run.')
            return 2

        # Create a general log entry about executing OpenVAS
        # It is important to send at least one result, otherwise
        # the host details won't be stored.
        self.add_scan_log(scan_id, host=target, name='OpenVAS summary',
                          value='An OpenVAS Scanner was started for %s.'
                          % target)

        self.add_scan_log(scan_id, host=target, name='KB location Found',
                          value='KB location path was found: %s.'
                          % self.openvas_db.db_address)

        self.add_scan_log(scan_id, host=target, name='Feed Update',
                          value='Feed version: %s.'
                          % self.nvti.get_feed_version())

        cmd = ['openvassd', '--scan-start', openvas_scan_id]
        try:
            result = subprocess.Popen(cmd, shell=False)
        except OSError:
            # the command is not available
            return False

        ovas_pid = result.pid
        logger.debug('pid = {0}'.format(ovas_pid))
        self.openvas_db.add_single_item('internal/ovas_pid', [ovas_pid])

        # Wait until the scanner starts and loads all the preferences.
        while self.openvas_db.get_single_item('internal/'+ openvas_scan_id) == 'new':
            time.sleep(1)

        no_id_found = False
        while True:
            time.sleep(3)

            # Check if the client stopped the whole scan
            if self.scan_is_stopped(openvas_scan_id):
                return 1

            ctx = self.openvas_db.kb_connect(self.main_kbindex)
            self.openvas_db.set_redisctx(ctx)
            dbs = self.openvas_db.get_list_item('internal/dbindex')
            for i in list(dbs):
                if i == self.main_kbindex:
                    continue
                self.openvas_db.select_kb(ctx, str(i), set_global=True)
                id_aux = self.openvas_db.get_single_item('internal/scan_id')
                if not id_aux:
                    continue
                if id_aux == openvas_scan_id:
                    no_id_found = False
                    self.get_openvas_timestamp_scan_host(scan_id, target)
                    self.get_openvas_result(scan_id)
                    self.get_openvas_status(scan_id, target)
                    if self.scan_is_finished(openvas_scan_id):
                        self.openvas_db.select_kb(
                            ctx, str(self.main_kbindex), set_global=False)
                        self.openvas_db.remove_list_item('internal/dbindex', i)
                        self.openvas_db.release_db(i)

            # Scan end. No kb in use for this scan id
            if no_id_found:
                break
            no_id_found = True

        # Delete keys from KB related to this scan task.
        self.openvas_db.release_db(self.main_kbindex)
        return 1


def main():
    """ OSP openvas main function. """
    daemon_main('OSPD - openvas wrapper', OSPDopenvas)