aboutsummaryrefslogtreecommitdiff
blob: 1c1c9fbcec96663f22b6dce10eef431045829fbe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
# 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['source'], 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))