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 | 181 |
1 files changed, 129 insertions, 52 deletions
diff --git a/meta/recipes-core/meta/cve-update-db-native.bb b/meta/recipes-core/meta/cve-update-db-native.bb index 9e8e006a32..efc32470d3 100644 --- a/meta/recipes-core/meta/cve-update-db-native.bb +++ b/meta/recipes-core/meta/cve-update-db-native.bb @@ -12,28 +12,76 @@ deltask do_compile deltask do_install deltask do_populate_sysroot +# 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" +NVDCVE_URL ?= "https://nvd.nist.gov/feeds/json/cve/1.1/nvdcve-1.1-" + +CVE_DB_TEMP_FILE ?= "${CVE_CHECK_DB_DIR}/temp_nvdcve_1.1.db" + python () { if not bb.data.inherits_class("cve-check", d): raise bb.parse.SkipRecipe("Skip recipe when cve-check class is not loaded.") } -python do_populate_cve_db() { +python do_fetch() { """ Update NVD database with json data feed """ import bb.utils import bb.progress - import sqlite3, urllib, urllib.parse, shutil, gzip - from datetime import date + import shutil bb.utils.export_proxies(d) - BASE_URL = "https://nvd.nist.gov/feeds/json/cve/1.1/nvdcve-1.1-" - YEAR_START = 2002 - db_file = d.getVar("CVE_CHECK_DB_FILE") db_dir = os.path.dirname(db_file) + db_tmp_file = d.getVar("CVE_DB_TEMP_FILE") + + cleanup_db_download(db_file, db_tmp_file) + + # The NVD database changes once a day, so no need to update more frequently + # Allow the user to force-update + try: + import time + update_interval = int(d.getVar("CVE_DB_UPDATE_INTERVAL")) + if update_interval < 0: + bb.note("CVE database update skipped") + return + if time.time() - os.path.getmtime(db_file) < update_interval: + return + except OSError: + pass + + bb.utils.mkdirhier(db_dir) + if os.path.exists(db_file): + shutil.copy2(db_file, db_tmp_file) + + if update_db_file(db_tmp_file, d) == True: + # Update downloaded correctly, can swap files + shutil.move(db_tmp_file, db_file) + else: + # Update failed, do not modify the database + bb.note("CVE database update failed") + os.remove(db_tmp_file) +} + +do_fetch[lockfiles] += "${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. @@ -42,37 +90,50 @@ python do_populate_cve_db() { if os.path.exists(db_file): os.remove(db_file) - # Don't refresh the database more than once an hour - try: - import time - if time.time() - os.path.getmtime(db_file) < (60*60): - return - except OSError: - pass + # 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)) - bb.utils.mkdirhier(db_dir) + if os.path.exists(db_tmp_file): + os.remove(db_tmp_file) - # Connect to database - conn = sqlite3.connect(db_file) - c = conn.cursor() +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 - initialize_db(c) + 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 = BASE_URL + str(year) + 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) + 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 + bb.warn("Failed to fetch CVE data (%s)" % e) + import socket + result = socket.getaddrinfo("nvd.nist.gov", 443, proto=socket.IPPROTO_TCP) + bb.warn("Host IPs are %s" % (", ".join(t[4][0] for t in result))) + return False if response: for l in response.read().decode("utf-8").splitlines(): @@ -82,64 +143,81 @@ python do_populate_cve_db() { break else: bb.warn("Cannot parse CVE metadata, update failed") - return + return False # Compare with current db last modified date - c.execute("select DATE from META where YEAR = ?", (year,)) - meta = c.fetchone() + 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 - c.execute("delete from PRODUCTS where ID like ?", ('CVE-%d%%' % 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) + response = urllib.request.urlopen(json_url, timeout=cve_socket_timeout) if response: - update_db(c, gzip.decompress(response.read()).decode('utf-8')) - c.execute("insert or replace into META values (?, ?)", [year, last_modified]) + 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 - + 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 -do_populate_cve_db[lockfiles] += "${CVE_CHECK_DB_FILE_LOCK}" +def initialize_db(conn): + with conn: + c = conn.cursor() -def initialize_db(c): - c.execute("CREATE TABLE IF NOT EXISTS META (YEAR INTEGER UNIQUE, DATE TEXT)") + 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 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.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);") -def parse_node_and_insert(c, node, cveId): + 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(c, child, cveId) + parse_node_and_insert(conn, child, cveId) def cpe_generator(): for cpe in node.get('cpe_match', ()): if not cpe['vulnerable']: return - cpe23 = cpe['cpe23Uri'].split(':') + 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, '=', '', ''] + yield [cveId, vendor, product, version + version_suffix, '=', '', ''] elif version == '-': # no version information is available yield [cveId, vendor, product, version, '', '', ''] @@ -173,9 +251,9 @@ def parse_node_and_insert(c, node, cveId): # Save processing by representing as -. yield [cveId, vendor, product, '-', '', '', ''] - c.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()) + conn.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()).close() -def update_db(c, jsondata): +def update_db(conn, jsondata): import json root = json.loads(jsondata) @@ -199,15 +277,14 @@ def update_db(c, jsondata): accessVector = accessVector or "UNKNOWN" cvssv3 = 0.0 - c.execute("insert or replace into NVD values (?, ?, ?, ?, ?, ?)", - [cveId, cveDesc, cvssv2, cvssv3, date, accessVector]) + 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(c, config, cveId) + parse_node_and_insert(conn, config, cveId) -addtask do_populate_cve_db before do_fetch -do_populate_cve_db[nostamp] = "1" +do_fetch[nostamp] = "1" EXCLUDE_FROM_WORLD = "1" |