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# -*- coding: utf-8 -*-
# Description: fail2ban log netdata python.d module
# Author: ilyam8
# SPDX-License-Identifier: GPL-3.0-or-later
import os
import re
from collections import defaultdict
from glob import glob
from bases.FrameworkServices.LogService import LogService
ORDER = [
'jails_failed_attempts',
'jails_bans',
'jails_banned_ips',
]
def charts(jails):
"""
Chart definitions creating
"""
ch = {
ORDER[0]: {
'options': [None, 'Failed attempts', 'attempts/s', 'failed attempts', 'fail2ban.failed_attempts', 'line'],
'lines': []
},
ORDER[1]: {
'options': [None, 'Bans', 'bans/s', 'bans', 'fail2ban.bans', 'line'],
'lines': []
},
ORDER[2]: {
'options': [None, 'Banned IP addresses (since the last restart of netdata)', 'ips', 'banned ips',
'fail2ban.banned_ips', 'line'],
'lines': []
},
}
for jail in jails:
dim = ['{0}_failed_attempts'.format(jail), jail, 'incremental']
ch[ORDER[0]]['lines'].append(dim)
dim = [jail, jail, 'incremental']
ch[ORDER[1]]['lines'].append(dim)
dim = ['{0}_in_jail'.format(jail), jail, 'absolute']
ch[ORDER[2]]['lines'].append(dim)
return ch
RE_JAILS = re.compile(r'\[([a-zA-Z0-9_-]+)\][^\[\]]+?enabled\s+= +(true|yes|false|no)')
ACTION_BAN = 'Ban'
ACTION_UNBAN = 'Unban'
ACTION_RESTORE_BAN = 'Restore Ban'
ACTION_FOUND = 'Found'
# Example:
# 2018-09-12 11:45:58,727 fail2ban.actions[25029]: WARNING [ssh] Found 203.0.113.1
# 2018-09-12 11:45:58,727 fail2ban.actions[25029]: WARNING [ssh] Ban 203.0.113.1
# 2018-09-12 11:45:58,727 fail2ban.actions[25029]: WARNING [ssh] Restore Ban 203.0.113.1
# 2018-09-12 11:45:53,715 fail2ban.actions[25029]: WARNING [ssh] Unban 203.0.113.1
RE_DATA = re.compile(
r'\[(?P<jail>[A-Za-z-_0-9]+)\] (?P<action>{0}|{1}|{2}|{3}) (?P<ip>[a-f0-9.:]+)'.format(
ACTION_BAN, ACTION_UNBAN, ACTION_RESTORE_BAN, ACTION_FOUND
)
)
DEFAULT_JAILS = [
'ssh',
]
class Service(LogService):
def __init__(self, configuration=None, name=None):
LogService.__init__(self, configuration=configuration, name=name)
self.order = ORDER
self.definitions = dict()
self.log_path = self.configuration.get('log_path', '/var/log/fail2ban.log')
self.conf_path = self.configuration.get('conf_path', '/etc/fail2ban/jail.local')
self.conf_dir = self.configuration.get('conf_dir', '/etc/fail2ban/jail.d/')
self.exclude = self.configuration.get('exclude', str())
self.monitoring_jails = list()
self.banned_ips = defaultdict(set)
self.data = dict()
def check(self):
"""
:return: bool
"""
if not self.conf_path.endswith(('.conf', '.local')):
self.error('{0} is a wrong conf path name, must be *.conf or *.local'.format(self.conf_path))
return False
if not os.access(self.log_path, os.R_OK):
self.error('{0} is not readable'.format(self.log_path))
return False
if os.path.getsize(self.log_path) == 0:
self.error('{0} is empty'.format(self.log_path))
return False
self.monitoring_jails = self.jails_auto_detection()
for jail in self.monitoring_jails:
self.data['{0}_failed_attempts'.format(jail)] = 0
self.data[jail] = 0
self.data['{0}_in_jail'.format(jail)] = 0
self.definitions = charts(self.monitoring_jails)
self.info('monitoring jails: {0}'.format(self.monitoring_jails))
return True
def get_data(self):
"""
:return: dict
"""
raw = self._get_raw_data()
if not raw:
return None if raw is None else self.data
for row in raw:
match = RE_DATA.search(row)
if not match:
continue
match = match.groupdict()
if match['jail'] not in self.monitoring_jails:
continue
jail, action, ip = match['jail'], match['action'], match['ip']
if action == ACTION_FOUND:
self.data['{0}_failed_attempts'.format(jail)] += 1
elif action in (ACTION_BAN, ACTION_RESTORE_BAN):
self.data[jail] += 1
if ip not in self.banned_ips[jail]:
self.banned_ips[jail].add(ip)
self.data['{0}_in_jail'.format(jail)] += 1
elif action == ACTION_UNBAN:
if ip in self.banned_ips[jail]:
self.banned_ips[jail].remove(ip)
self.data['{0}_in_jail'.format(jail)] -= 1
return self.data
def get_files_from_dir(self, dir_path, suffix):
"""
:return: list
"""
if not os.path.isdir(dir_path):
self.error('{0} is not a directory'.format(dir_path))
return list()
return glob('{0}/*.{1}'.format(self.conf_dir, suffix))
def get_jails_from_file(self, file_path):
"""
:return: list
"""
if not os.access(file_path, os.R_OK):
self.error('{0} is not readable or not exist'.format(file_path))
return list()
with open(file_path, 'rt') as f:
lines = f.readlines()
raw = ' '.join(line for line in lines if line.startswith(('[', 'enabled')))
match = RE_JAILS.findall(raw)
# Result: [('ssh', 'true'), ('dropbear', 'true'), ('pam-generic', 'true'), ...]
if not match:
self.debug('{0} parse failed'.format(file_path))
return list()
return match
def jails_auto_detection(self):
"""
:return: list
Parses jail configuration files. Returns list of enabled jails.
According man jail.conf parse order must be
* jail.conf
* jail.d/*.conf (in alphabetical order)
* jail.local
* jail.d/*.local (in alphabetical order)
"""
jails_files, all_jails, active_jails = list(), list(), list()
jails_files.append('{0}.conf'.format(self.conf_path.rsplit('.')[0]))
jails_files.extend(self.get_files_from_dir(self.conf_dir, 'conf'))
jails_files.append('{0}.local'.format(self.conf_path.rsplit('.')[0]))
jails_files.extend(self.get_files_from_dir(self.conf_dir, 'local'))
self.debug('config files to parse: {0}'.format(jails_files))
for f in jails_files:
all_jails.extend(self.get_jails_from_file(f))
exclude = self.exclude.split()
for name, status in all_jails:
if name in exclude:
continue
if status in ('true', 'yes') and name not in active_jails:
active_jails.append(name)
elif status in ('false', 'no') and name in active_jails:
active_jails.remove(name)
return active_jails or DEFAULT_JAILS
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