diff options
Diffstat (limited to 'meta/recipes-core/meta/cve-update-db-native.bb')
| -rw-r--r-- | meta/recipes-core/meta/cve-update-db-native.bb | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/meta/recipes-core/meta/cve-update-db-native.bb b/meta/recipes-core/meta/cve-update-db-native.bb new file mode 100644 index 0000000000..079f062f79 --- /dev/null +++ b/meta/recipes-core/meta/cve-update-db-native.bb @@ -0,0 +1,288 @@ +SUMMARY = "Updates the NVD CVE database" +LICENSE = "MIT" + +INHIBIT_DEFAULT_DEPS = "1" + +inherit native + +deltask do_unpack +deltask do_patch +deltask do_configure +deltask do_compile +deltask do_install +deltask do_populate_sysroot + +NVDCVE_URL ?= "https://nvd.nist.gov/feeds/json/cve/1.1/nvdcve-1.1-" +# CVE database update interval, in seconds. By default: once a day (24*60*60). +# Use 0 to force the update +# Use a negative value to skip the update +CVE_DB_UPDATE_INTERVAL ?= "86400" + +# Timeout for blocking socket operations, such as the connection attempt. +CVE_SOCKET_TIMEOUT ?= "60" + +CVE_DB_TEMP_FILE ?= "${CVE_CHECK_DB_DIR}/temp_nvdcve_1.1.db" + +python () { + if not bb.data.inherits_class("cve-check", d): + raise bb.parse.SkipRecipe("Skip recipe when cve-check class is not loaded.") +} + +python do_fetch() { + """ + Update NVD database with json data feed + """ + import bb.utils + import bb.progress + import shutil + + bb.utils.export_proxies(d) + + db_file = d.getVar("CVE_CHECK_DB_FILE") + db_dir = os.path.dirname(db_file) + db_tmp_file = d.getVar("CVE_DB_TEMP_FILE") + + cleanup_db_download(db_file, db_tmp_file) + + # The NVD database changes once a day, so no need to update more frequently + # Allow the user to force-update + try: + import time + update_interval = int(d.getVar("CVE_DB_UPDATE_INTERVAL")) + if update_interval < 0: + bb.note("CVE database update skipped") + return + if time.time() - os.path.getmtime(db_file) < update_interval: + bb.debug(2, "Recently updated, skipping") + return + + except OSError: + pass + + bb.utils.mkdirhier(db_dir) + if os.path.exists(db_file): + shutil.copy2(db_file, db_tmp_file) + + if update_db_file(db_tmp_file, d) == True: + # Update downloaded correctly, can swap files + shutil.move(db_tmp_file, db_file) + else: + # Update failed, do not modify the database + bb.note("CVE database update failed") + os.remove(db_tmp_file) +} + +do_fetch[lockfiles] += "${CVE_CHECK_DB_FILE_LOCK}" +do_fetch[file-checksums] = "" +do_fetch[vardeps] = "" + +def cleanup_db_download(db_file, db_tmp_file): + """ + Cleanup the download space from possible failed downloads + """ + + # Clean up the updates done on the main file + # Remove it only if a journal file exists - it means a complete re-download + if os.path.exists("{0}-journal".format(db_file)): + # If a journal is present the last update might have been interrupted. In that case, + # just wipe any leftovers and force the DB to be recreated. + os.remove("{0}-journal".format(db_file)) + + if os.path.exists(db_file): + os.remove(db_file) + + # Clean-up the temporary file downloads, we can remove both journal + # and the temporary database + if os.path.exists("{0}-journal".format(db_tmp_file)): + # If a journal is present the last update might have been interrupted. In that case, + # just wipe any leftovers and force the DB to be recreated. + os.remove("{0}-journal".format(db_tmp_file)) + + if os.path.exists(db_tmp_file): + os.remove(db_tmp_file) + +def update_db_file(db_tmp_file, d): + """ + Update the given database file + """ + import bb.utils, bb.progress + from datetime import date + import urllib, gzip, sqlite3 + + YEAR_START = 2002 + cve_socket_timeout = int(d.getVar("CVE_SOCKET_TIMEOUT")) + + # Connect to database + conn = sqlite3.connect(db_tmp_file) + initialize_db(conn) + + with bb.progress.ProgressHandler(d) as ph, open(os.path.join(d.getVar("TMPDIR"), 'cve_check'), 'a') as cve_f: + total_years = date.today().year + 1 - YEAR_START + for i, year in enumerate(range(YEAR_START, date.today().year + 1)): + bb.debug(2, "Updating %d" % year) + ph.update((float(i + 1) / total_years) * 100) + year_url = (d.getVar('NVDCVE_URL')) + str(year) + meta_url = year_url + ".meta" + json_url = year_url + ".json.gz" + + # Retrieve meta last modified date + try: + response = urllib.request.urlopen(meta_url, timeout=cve_socket_timeout) + except urllib.error.URLError as e: + cve_f.write('Warning: CVE db update error, Unable to fetch CVE data.\n\n') + bb.warn("Failed to fetch CVE data (%s)" % e.reason) + return False + + if response: + for l in response.read().decode("utf-8").splitlines(): + key, value = l.split(":", 1) + if key == "lastModifiedDate": + last_modified = value + break + else: + bb.warn("Cannot parse CVE metadata, update failed") + return False + + # Compare with current db last modified date + cursor = conn.execute("select DATE from META where YEAR = ?", (year,)) + meta = cursor.fetchone() + cursor.close() + + if not meta or meta[0] != last_modified: + bb.debug(2, "Updating entries") + # Clear products table entries corresponding to current year + conn.execute("delete from PRODUCTS where ID like ?", ('CVE-%d%%' % year,)).close() + + # Update db with current year json file + try: + response = urllib.request.urlopen(json_url, timeout=cve_socket_timeout) + if response: + update_db(conn, gzip.decompress(response.read()).decode('utf-8')) + conn.execute("insert or replace into META values (?, ?)", [year, last_modified]).close() + except urllib.error.URLError as e: + cve_f.write('Warning: CVE db update error, CVE data is outdated.\n\n') + bb.warn("Cannot parse CVE data (%s), update failed" % e.reason) + return False + else: + bb.debug(2, "Already up to date (last modified %s)" % last_modified) + # Update success, set the date to cve_check file. + if year == date.today().year: + cve_f.write('CVE database update : %s\n\n' % date.today()) + + conn.commit() + conn.close() + return True + +def initialize_db(conn): + with conn: + c = conn.cursor() + + c.execute("CREATE TABLE IF NOT EXISTS META (YEAR INTEGER UNIQUE, DATE TEXT)") + + c.execute("CREATE TABLE IF NOT EXISTS NVD (ID TEXT UNIQUE, SUMMARY TEXT, \ + SCOREV2 TEXT, SCOREV3 TEXT, MODIFIED INTEGER, VECTOR TEXT)") + + c.execute("CREATE TABLE IF NOT EXISTS PRODUCTS (ID TEXT, \ + VENDOR TEXT, PRODUCT TEXT, VERSION_START TEXT, OPERATOR_START TEXT, \ + VERSION_END TEXT, OPERATOR_END TEXT)") + c.execute("CREATE INDEX IF NOT EXISTS PRODUCT_ID_IDX on PRODUCTS(ID);") + + c.close() + +def parse_node_and_insert(conn, node, cveId): + # Parse children node if needed + for child in node.get('children', ()): + parse_node_and_insert(conn, child, cveId) + + def cpe_generator(): + for cpe in node.get('cpe_match', ()): + if not cpe['vulnerable']: + return + cpe23 = cpe.get('cpe23Uri') + if not cpe23: + return + cpe23 = cpe23.split(':') + if len(cpe23) < 6: + return + vendor = cpe23[3] + product = cpe23[4] + version = cpe23[5] + + if cpe23[6] == '*' or cpe23[6] == '-': + version_suffix = "" + else: + version_suffix = "_" + cpe23[6] + + if version != '*' and version != '-': + # Version is defined, this is a '=' match + yield [cveId, vendor, product, version + version_suffix, '=', '', ''] + elif version == '-': + # no version information is available + yield [cveId, vendor, product, version, '', '', ''] + else: + # Parse start version, end version and operators + op_start = '' + op_end = '' + v_start = '' + v_end = '' + + if 'versionStartIncluding' in cpe: + op_start = '>=' + v_start = cpe['versionStartIncluding'] + + if 'versionStartExcluding' in cpe: + op_start = '>' + v_start = cpe['versionStartExcluding'] + + if 'versionEndIncluding' in cpe: + op_end = '<=' + v_end = cpe['versionEndIncluding'] + + if 'versionEndExcluding' in cpe: + op_end = '<' + v_end = cpe['versionEndExcluding'] + + if op_start or op_end or v_start or v_end: + yield [cveId, vendor, product, v_start, op_start, v_end, op_end] + else: + # This is no version information, expressed differently. + # Save processing by representing as -. + yield [cveId, vendor, product, '-', '', '', ''] + + conn.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()).close() + +def update_db(conn, jsondata): + import json + root = json.loads(jsondata) + + for elt in root['CVE_Items']: + if not elt['impact']: + continue + + accessVector = None + cveId = elt['cve']['CVE_data_meta']['ID'] + cveDesc = elt['cve']['description']['description_data'][0]['value'] + date = elt['lastModifiedDate'] + try: + accessVector = elt['impact']['baseMetricV2']['cvssV2']['accessVector'] + cvssv2 = elt['impact']['baseMetricV2']['cvssV2']['baseScore'] + except KeyError: + cvssv2 = 0.0 + try: + accessVector = accessVector or elt['impact']['baseMetricV3']['cvssV3']['attackVector'] + cvssv3 = elt['impact']['baseMetricV3']['cvssV3']['baseScore'] + except KeyError: + accessVector = accessVector or "UNKNOWN" + cvssv3 = 0.0 + + conn.execute("insert or replace into NVD values (?, ?, ?, ?, ?, ?)", + [cveId, cveDesc, cvssv2, cvssv3, date, accessVector]).close() + + configurations = elt['configurations']['nodes'] + for config in configurations: + parse_node_and_insert(conn, config, cveId) + + +do_fetch[nostamp] = "1" + +EXCLUDE_FROM_WORLD = "1" |