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# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""Disable EC2 Metadata: Disable AWS EC2 metadata."""
import logging
from textwrap import dedent
from cloudinit import subp, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.distros import ALL_DISTROS
from cloudinit.settings import PER_ALWAYS
REJECT_CMD_IF = ["route", "add", "-host", "169.254.169.254", "reject"]
REJECT_CMD_IP = ["ip", "route", "add", "prohibit", "169.254.169.254"]
LOG = logging.getLogger(__name__)
meta: MetaSchema = {
"id": "cc_disable_ec2_metadata",
"name": "Disable EC2 Metadata",
"title": "Disable AWS EC2 Metadata",
"description": dedent(
"""\
This module can disable the ec2 datasource by rejecting the route to
``169.254.169.254``, the usual route to the datasource. This module
is disabled by default."""
),
"distros": [ALL_DISTROS],
"frequency": PER_ALWAYS,
"examples": ["disable_ec2_metadata: true"],
"activate_by_schema_keys": ["disable_ec2_metadata"],
}
__doc__ = get_meta_doc(meta)
def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
disabled = util.get_cfg_option_bool(cfg, "disable_ec2_metadata", False)
if disabled:
reject_cmd = None
if subp.which("ip"):
reject_cmd = REJECT_CMD_IP
elif subp.which("ifconfig"):
reject_cmd = REJECT_CMD_IF
else:
LOG.error(
'Neither "route" nor "ip" command found, unable to '
"manipulate routing table"
)
return
subp.subp(reject_cmd, capture=False)
else:
LOG.debug(
"Skipping module named %s, disabling the ec2 route not enabled",
name,
)
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