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# nvd.py -- simplistic NVD parser
# Copyright (C) 2005 Florian Weimer <fw@deneb.enyo.de>
#
# 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
class _Parser(xml.sax.handler.ContentHandler):
"""Parser helper class."""
def __init__(self):
self.result = []
self.start_dispatcher = {}
for x in ('entry', 'local', 'range', 'remote', 'user_init',
'avail', 'conf', 'int', 'sec_prot'):
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):
self.name = attrs['name'].encode('utf-8')
self.published = attrs['published'].encode('utf-8')
self.severity = attrs.get('severity', u'').encode('utf-8')
self.discovered = attrs.get('discovered', u'').encode('utf-8')
self.cve_desc = ""
self.range_local = self.range_remote = 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
def TAG_range(self, name, attrs):
self.range_local = self.range_remote = self.range_user_init = 0
def TAG_local(self, name, attrs):
self.range_local = 1
def TAG_remote(self, name, attrs):
self.range_remote = 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 endElement(self, name):
if name == 'entry':
# FIXME: normalize CAN to CVE. Should go away soon.
name = self.name
if name[0:4] == 'CAN-':
name = 'CVE-' + name[4:]
self.result.append((name,
self.cve_desc,
self.discovered,
self.published,
self.severity,
self.range_local,
self.range_remote,
self.range_user_init,
self.loss_avail,
self.loss_conf,
self.loss_int,
self.loss_sec_prot_user,
self.loss_sec_prot_admin,
self.loss_sec_prot_other))
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 parse(file):
"""Parses the indicated file object. Returns a list of tuples,
containing the following elements:
- CVE name
- discovery data (can be empty)
- publication date
- severity (can be empty)
- local range flag
- remote 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)
parser.parse(file)
return p.result
if __name__ == "__main__":
import sys
for name in sys.argv[1:]:
parse(file(name))
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