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# nvd.py -- simplistic NVD parser
# Copyright (C) 2005 Florian Weimer <fw@deneb.enyo.de>
#
# Modifications by Robert Buchholz <rbu@gentoo.org>
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
"""This module parses the XML files provided by the
National Vulnerability Database (NVD) <http://nvd.nist.gov/>
"""
import xml.sax
import xml.sax.handler
import datetime
class _Parser(xml.sax.handler.ContentHandler):
"""Parser helper class."""
def __init__(self):
self.result = {}
self.start_dispatcher = {}
for x in ('entry', 'local', 'range', 'network', 'local_network', 'user_init',
'avail', 'conf', 'int', 'sec_prot', 'prod', 'ref'):
self.start_dispatcher[x] = getattr(self, 'TAG_' + x)
self.path = []
def _noop(*args):
pass
def startElement(self, name, attrs):
self.path.append((name, attrs))
self.start_dispatcher.get(name, self._noop)(name, attrs)
def TAG_entry(self, name, attrs):
try:
self.name = attrs['name']
if not isinstance(self.name, unicode):
self.name = self.name.encode('utf-8')
except KeyError:
pass
try:
self.published = attrs['published']
if not isinstance(self.published, unicode):
self.published = self.published.encode('utf-8')
except KeyError:
pass
try:
self.modified = attrs['modified']
if not isinstance(self.modified, unicode):
self.modified = self.modified.encode('utf-8')
except KeyError:
self.modified = str(datetime.date.today()).encode('utf-8')
try:
self.severity = attrs['severity']
if not isinstance(self.severity, unicode):
self.severity = self.severity.encode('utf-8')
except KeyError:
self.severity = u''
try:
self.discovered = attrs['discovered']
if not isinstance(self.discovered, unicode):
self.discovered = self.discovered.encode('utf-8')
except KeyError:
self.discovered = u''
self.cve_desc = ""
self.range_local = self.range_network = self.range_local_network \
= self.range_user_init = None
self.loss_avail = self.loss_conf = self.loss_int \
= self.loss_sec_prot_user = self.loss_sec_prot_admin \
= self.loss_sec_prot_other = 0
self.product_name = self.product_vendor = None
self.refs = []
def TAG_range(self, name, attrs):
self.range_local = self.range_local_network = self.range_network = self.range_user_init = 0
def TAG_local(self, name, attrs):
self.range_local = 1
def TAG_network(self, name, attrs):
self.range_network = 1
def TAG_local_network(self, name, attrs):
self.range_local_network = 1
def TAG_user_init(self, name, attrs):
self.range_user_init = 1
def TAG_loss_types(self, name, attrs):
self.clear_loss()
def TAG_avail(self, name, attrs):
self.loss_avail = 1
def TAG_conf(self, name, attrs):
self.loss_conf = 1
def TAG_int(self, name, attrs):
self.loss_int = 1
def TAG_sec_prot(self, name, attrs):
if attrs.has_key('user'):
self.loss_sec_prot_user = 1
if attrs.has_key('admin'):
self.loss_sec_prot_admin = 1
if attrs.has_key('other'):
self.loss_sec_prot_other = 1
def TAG_prod(self, name, attrs):
try:
self.product_name = attrs['name']
if not isinstance(self.product_name, unicode):
self.product_name = self.product_name.encode('utf-8')
except KeyError:
pass
try:
self.product_vendor = attrs['vendor']
if not isinstance(self.product_vendor, unicode):
self.product_vendor = self.product_vendor.encode('utf-8')
except KeyError:
pass
def TAG_ref(self, name, attrs):
if attrs.has_key('url'):
self.refs.append(attrs['url'])
def endElement(self, name):
if name == 'entry':
self.result[self.name] = {
'desc': self.cve_desc,
'discovered': self.discovered,
'published': self.published,
'modified': self.modified,
'severity': self.severity,
'range_local': self.range_local,
'range_network': self.range_network,
'range_local_network': self.range_local_network,
'range_user_init': self.range_user_init,
'loss_avail': self.loss_avail,
'loss_conf': self.loss_conf,
'loss_int': self.loss_int,
'loss_sec_prot_user': self.loss_sec_prot_user,
'loss_sec_prot_admin': self.loss_sec_prot_admin,
'loss_sec_prot_other': self.loss_sec_prot_other,
'product_name': self.product_name,
'product_vendor': self.product_vendor,
'refs' : self.refs}
del self.path[-1]
def characters(self, content):
(name, attrs) = self.path[-1]
if name == 'descript' and attrs['source'] == 'cve':
self.cve_desc += content
def parseAll(files):
"""Parses the indicated files. Returns a dictionary,
containing the following elements:
- CVE name
- discovery data (can be empty)
- publication date
- last modification date
- name of the vulnerable software
- severity (can be empty)
- local range flag
- network range flag
- local_network range flag
- availability loss type flag
- confidentiality loss type flag
- integrity loss type flag
- security protection (user) loss type flag
- security protection (admin) loss type flag
- security protection (other) loss type flag
"""
parser = xml.sax.make_parser()
parser.setFeature(xml.sax.handler.feature_namespaces, 0)
p = _Parser()
parser.setContentHandler(p)
for name in files:
file = open(name)
try:
parser.parse(file)
except xml.sax._exceptions.SAXParseException, e:
print "XML Parsing error at %s: %s" % (name, e)
file.close()
return p.result
if __name__ == "__main__":
import sys
for name in sys.argv[1:]:
parse(file(name))
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