[RFC,1/3] Restore cve-update-db from kirkstone

diff --git a/meta/recipes-core/meta/cve-update-db-native2.bb b/meta/recipes-core/meta/cve-update-db-native2.bb
new file mode 100644
index 0000000000..e042e67b09
--- /dev/null
+++ b/meta/recipes-core/meta/cve-update-db-native2.bb
@@ -0,0 +1,291 @@ 
+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)
+                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():
+                    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"