147 lines
4.3 KiB
Python
147 lines
4.3 KiB
Python
"""Ban logic for HTTP component."""
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import asyncio
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from collections import defaultdict
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from datetime import datetime
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from ipaddress import ip_address
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import logging
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import os
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from aiohttp.web_exceptions import HTTPForbidden, HTTPUnauthorized
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import voluptuous as vol
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from homeassistant.components import persistent_notification
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from homeassistant.config import load_yaml_config_file
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from homeassistant.exceptions import HomeAssistantError
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import homeassistant.helpers.config_validation as cv
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from homeassistant.util.yaml import dump
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from .const import (
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KEY_BANS_ENABLED, KEY_BANNED_IPS, KEY_LOGIN_THRESHOLD,
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KEY_FAILED_LOGIN_ATTEMPTS)
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from .util import get_real_ip
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NOTIFICATION_ID_BAN = 'ip-ban'
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NOTIFICATION_ID_LOGIN = 'http-login'
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IP_BANS_FILE = 'ip_bans.yaml'
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ATTR_BANNED_AT = "banned_at"
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SCHEMA_IP_BAN_ENTRY = vol.Schema({
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vol.Optional('banned_at'): vol.Any(None, cv.datetime)
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})
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_LOGGER = logging.getLogger(__name__)
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@asyncio.coroutine
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def ban_middleware(app, handler):
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"""IP Ban middleware."""
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if not app[KEY_BANS_ENABLED]:
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return handler
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if KEY_BANNED_IPS not in app:
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hass = app['hass']
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app[KEY_BANNED_IPS] = yield from hass.loop.run_in_executor(
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None, load_ip_bans_config, hass.config.path(IP_BANS_FILE))
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@asyncio.coroutine
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def ban_middleware_handler(request):
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"""Verify if IP is not banned."""
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ip_address_ = get_real_ip(request)
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is_banned = any(ip_ban.ip_address == ip_address_
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for ip_ban in request.app[KEY_BANNED_IPS])
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if is_banned:
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raise HTTPForbidden()
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try:
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return (yield from handler(request))
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except HTTPUnauthorized:
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yield from process_wrong_login(request)
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raise
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return ban_middleware_handler
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@asyncio.coroutine
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def process_wrong_login(request):
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"""Process a wrong login attempt."""
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remote_addr = get_real_ip(request)
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msg = ('Login attempt or request with invalid authentication '
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'from {}'.format(remote_addr))
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_LOGGER.warning(msg)
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persistent_notification.async_create(
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request.app['hass'], msg, 'Login attempt failed',
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NOTIFICATION_ID_LOGIN)
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if (not request.app[KEY_BANS_ENABLED] or
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request.app[KEY_LOGIN_THRESHOLD] < 1):
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return
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if KEY_FAILED_LOGIN_ATTEMPTS not in request.app:
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request.app[KEY_FAILED_LOGIN_ATTEMPTS] = defaultdict(int)
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request.app[KEY_FAILED_LOGIN_ATTEMPTS][remote_addr] += 1
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if (request.app[KEY_FAILED_LOGIN_ATTEMPTS][remote_addr] >
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request.app[KEY_LOGIN_THRESHOLD]):
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new_ban = IpBan(remote_addr)
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request.app[KEY_BANNED_IPS].append(new_ban)
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hass = request.app['hass']
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yield from hass.loop.run_in_executor(
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None, update_ip_bans_config, hass.config.path(IP_BANS_FILE),
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new_ban)
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_LOGGER.warning('Banned IP %s for too many login attempts',
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remote_addr)
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persistent_notification.async_create(
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hass,
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'Too many login attempts from {}'.format(remote_addr),
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'Banning IP address', NOTIFICATION_ID_BAN)
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class IpBan(object):
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"""Represents banned IP address."""
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def __init__(self, ip_ban: str, banned_at: datetime=None) -> None:
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"""Initializing Ip Ban object."""
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self.ip_address = ip_address(ip_ban)
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self.banned_at = banned_at or datetime.utcnow()
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def load_ip_bans_config(path: str):
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"""Loading list of banned IPs from config file."""
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ip_list = []
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if not os.path.isfile(path):
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return ip_list
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try:
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list_ = load_yaml_config_file(path)
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except HomeAssistantError as err:
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_LOGGER.error('Unable to load %s: %s', path, str(err))
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return ip_list
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for ip_ban, ip_info in list_.items():
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try:
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ip_info = SCHEMA_IP_BAN_ENTRY(ip_info)
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ip_list.append(IpBan(ip_ban, ip_info['banned_at']))
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except vol.Invalid as err:
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_LOGGER.error('Failed to load IP ban %s: %s', ip_info, err)
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continue
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return ip_list
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def update_ip_bans_config(path: str, ip_ban: IpBan):
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"""Update config file with new banned IP address."""
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with open(path, 'a') as out:
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ip_ = {str(ip_ban.ip_address): {
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ATTR_BANNED_AT: ip_ban.banned_at.strftime("%Y-%m-%dT%H:%M:%S")
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}}
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out.write('\n')
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out.write(dump(ip_))
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