#!/usr/bin/env python3 import xml.etree.ElementTree as ET from xml.etree.ElementTree import Element, SubElement import gzip import os import requests import time from xml.dom import minidom VALID_REFS = ['VENDOR', 'VERSION', 'CHANGE_LOG', 'PRODUCT', 'PROJECT', 'ADVISORY'] CPEDB_URL = "https://static.nvd.nist.gov/feeds/xml/cpe/dictionary/official-cpe-dictionary_v2.3.xml.gz" ns = { '': 'http://cpe.mitre.org/dictionary/2.0', 'cpe-23': 'http://scap.nist.gov/schema/cpe-extension/2.3', 'xml': 'http://www.w3.org/XML/1998/namespace' } class CPE: def __init__(self, cpe_str, titles, refs): self.cpe_str = cpe_str self.titles = titles self.references = refs self.cpe_cur_ver = "".join(self.cpe_str.split(":")[5:6]) def update_xml_dict(self): ET.register_namespace('', 'http://cpe.mitre.org/dictionary/2.0') cpes = Element('cpe-list') cpes.set('xmlns:cpe-23', "http://scap.nist.gov/schema/cpe-extension/2.3") cpes.set('xmlns:ns6', "http://scap.nist.gov/schema/scap-core/0.1") cpes.set('xmlns:scap-core', "http://scap.nist.gov/schema/scap-core/0.3") cpes.set('xmlns:config', "http://scap.nist.gov/schema/configuration/0.1") cpes.set('xmlns:xsi', "http://www.w3.org/2001/XMLSchema-instance") cpes.set('xmlns:meta', "http://scap.nist.gov/schema/cpe-dictionary-metadata/0.2") cpes.set('xsi:schemaLocation', " ".join(["http://scap.nist.gov/schema/cpe-extension/2.3", "https://scap.nist.gov/schema/cpe/2.3/cpe-dictionary-extension_2.3.xsd", "http://cpe.mitre.org/dictionary/2.0", "https://scap.nist.gov/schema/cpe/2.3/cpe-dictionary_2.3.xsd", "http://scap.nist.gov/schema/cpe-dictionary-metadata/0.2", "https://scap.nist.gov/schema/cpe/2.1/cpe-dictionary-metadata_0.2.xsd", "http://scap.nist.gov/schema/scap-core/0.3", "https://scap.nist.gov/schema/nvd/scap-core_0.3.xsd", "http://scap.nist.gov/schema/configuration/0.1", "https://scap.nist.gov/schema/nvd/configuration_0.1.xsd", "http://scap.nist.gov/schema/scap-core/0.1", "https://scap.nist.gov/schema/nvd/scap-core_0.1.xsd"])) item = SubElement(cpes, 'cpe-item') cpe_short_name = CPE.short_name(self.cpe_str) cpe_new_ver = CPE.version_update(self.cpe_str) item.set('name', 'cpe:/' + cpe_short_name) self.titles[0].text.replace(self.cpe_cur_ver, cpe_new_ver) for title in self.titles: item.append(title) if self.references: item.append(self.references) cpe23item = SubElement(item, 'cpe-23:cpe23-item') cpe23item.set('name', self.cpe_str) # Generate the XML as a string xmlstr = ET.tostring(cpes) # And use minidom to pretty print the XML return minidom.parseString(xmlstr).toprettyxml(encoding="utf-8").decode("utf-8") @staticmethod def version(cpe): return cpe.split(":")[5] @staticmethod def product(cpe): return cpe.split(":")[4] @staticmethod def short_name(cpe): return ":".join(cpe.split(":")[2:6]) @staticmethod def version_update(cpe): return ":".join(cpe.split(":")[5:6]) @staticmethod def no_version(cpe): return ":".join(cpe.split(":")[:5]) class CPEDB: def __init__(self, nvd_path): self.all_cpes = dict() self.all_cpes_no_version = dict() self.nvd_path = nvd_path def get_xml_dict(self): print("CPE: Setting up NIST dictionary") if not os.path.exists(os.path.join(self.nvd_path, "cpe")): os.makedirs(os.path.join(self.nvd_path, "cpe")) cpe_dict_local = os.path.join(self.nvd_path, "cpe", os.path.basename(CPEDB_URL)) if not os.path.exists(cpe_dict_local) or os.stat(cpe_dict_local).st_mtime < time.time() - 86400: print("CPE: Fetching xml manifest from [" + CPEDB_URL + "]") cpe_dict = requests.get(CPEDB_URL) open(cpe_dict_local, "wb").write(cpe_dict.content) print("CPE: Unzipping xml manifest...") nist_cpe_file = gzip.GzipFile(fileobj=open(cpe_dict_local, 'rb')) print("CPE: Converting xml manifest to dict...") tree = ET.parse(nist_cpe_file) all_cpedb = tree.getroot() self.parse_dict(all_cpedb) def parse_dict(self, all_cpedb): # Cycle through the dict and build two dict to be used for custom # lookups of partial and complete CPE objects # The objects are then used to create new proposed XML updates if # if is determined one is required # Out of the different language titles, select English for cpe in all_cpedb.findall(".//{http://cpe.mitre.org/dictionary/2.0}cpe-item"): cpe_titles = [] for title in cpe.findall('.//{http://cpe.mitre.org/dictionary/2.0}title[@xml:lang="en-US"]', ns): title.tail = None cpe_titles.append(title) # Some older CPE don't include references, if they do, make # sure we handle the case of one ref needing to be packed # in a list cpe_ref = cpe.find(".//{http://cpe.mitre.org/dictionary/2.0}references") if cpe_ref: for ref in cpe_ref.findall(".//{http://cpe.mitre.org/dictionary/2.0}reference"): ref.tail = None ref.text = ref.text.upper() if ref.text not in VALID_REFS: ref.text = ref.text + "-- UPDATE this entry, here are some examples and just one word should be used -- " + ' '.join(VALID_REFS) # noqa E501 cpe_ref.tail = None cpe_ref.text = None cpe_str = cpe.find(".//{http://scap.nist.gov/schema/cpe-extension/2.3}cpe23-item").get('name') item = CPE(cpe_str, cpe_titles, cpe_ref) cpe_str_no_version = CPE.no_version(cpe_str) # This dict must have a unique key for every CPE version # which allows matching to the specific obj data of that # NIST dict entry self.all_cpes.update({cpe_str: item}) # This dict has one entry for every CPE (w/o version) to allow # partial match (no valid version) check (the obj is saved and # used as seed for suggested xml updates. By updating the same # non-version'd entry, it assumes the last update here is the # latest version in the NIST dict) self.all_cpes_no_version.update({cpe_str_no_version: item}) def find_partial(self, cpe_str): cpe_str_no_version = CPE.no_version(cpe_str) if cpe_str_no_version in self.all_cpes_no_version: return cpe_str_no_version def find_partial_obj(self, cpe_str): cpe_str_no_version = CPE.no_version(cpe_str) if cpe_str_no_version in self.all_cpes_no_version: return self.all_cpes_no_version[cpe_str_no_version] def find_partial_latest_version(self, cpe_str_partial): cpe_obj = self.find_partial_obj(cpe_str_partial) return cpe_obj.cpe_cur_ver def find(self, cpe_str): if self.find_partial(cpe_str): if cpe_str in self.all_cpes: return cpe_str def gen_update_xml(self, cpe_str): cpe = self.find_partial_obj(cpe_str) return cpe.update_xml_dict()