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opnsense_checkmk_agent.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# vim: set fileencoding=utf-8:noet
## Copyright 2022 Bashclub
## BSD-2-Clause
##
## Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
##
## 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
##
## 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
## THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
## BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
## GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
## LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## OPNsense CheckMK Agent
## to install
## copy to /usr/local/etc/rc.syshook.d/start/99-checkmk_agent and chmod +x
##
__VERSION__ = "0.79"
import sys
import os
import shlex
import glob
import re
import time
import json
import socket
import signal
import struct
import subprocess
import pwd
import threading
import ipaddress
import base64
import traceback
from cryptography import x509
from cryptography.hazmat.backends import default_backend as crypto_default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from xml.etree import cElementTree as ELementTree
from collections import Counter,defaultdict
from pprint import pprint
from socketserver import TCPServer,StreamRequestHandler
BASEDIR = os.path.dirname(os.path.abspath(os.path.basename(__file__)))
LOCALDIR = os.path.join(BASEDIR,"local")
class object_dict(defaultdict):
def __getattr__(self,name):
return self[name] if name in self else ""
def etree_to_dict(t):
d = {t.tag: {} if t.attrib else None}
children = list(t)
if children:
dd = object_dict(list)
for dc in map(etree_to_dict, children):
for k, v in dc.items():
dd[k].append(v)
d = {t.tag: {k:v[0] if len(v) == 1 else v for k, v in dd.items()}}
if t.attrib:
d[t.tag].update(('@' + k, v) for k, v in t.attrib.items())
if t.text:
text = t.text.strip()
if children or t.attrib:
if text:
d[t.tag]['#text'] = text
else:
d[t.tag] = text
return d
def pad_pkcs7(message,size=16):
_pad = size - (len(message) % size)
if type(message) == str:
return message + chr(_pad) * _pad
else:
return message + bytes([_pad]) * _pad
class checkmk_handler(StreamRequestHandler):
def handle(self):
with self.server._mutex:
try:
_strmsg = self.server.do_checks(remote_ip=self.client_address[0])
except Exception as e:
raise
_strmsg = str(e).encode("utf-8")
try:
self.wfile.write(_strmsg)
except:
raise
pass
class checkmk_checker(object):
_certificate_timestamp = 0
_check_cache = {}
_datastore_mutex = threading.RLock()
_datastore = object_dict()
def encrypt(self,message,password='secretpassword'):
SALT_LENGTH = 8
KEY_LENGTH = 32
IV_LENGTH = 16
PBKDF2_CYCLES = 10_000
SALT = b"Salted__"
_backend = crypto_default_backend()
_kdf_key = PBKDF2HMAC(
algorithm = hashes.SHA256,
length = KEY_LENGTH + IV_LENGTH,
salt = SALT,
iterations = PBKDF2_CYCLES,
backend = _backend
).derive(password.encode("utf-8"))
_key, _iv = _kdf_key[:KEY_LENGTH],_kdf_key[KEY_LENGTH:]
_encryptor = Cipher(
algorithms.AES(_key),
modes.CBC(_iv),
backend = _backend
).encryptor()
message = pad_pkcs7(message)
message = message.encode("utf-8")
_encrypted_message = _encryptor.update(message) + _encryptor.finalize()
return pad_pkcs7(b"03",10) + SALT + _encrypted_message
def _encrypt(self,message):
_cmd = shlex.split('openssl enc -aes-256-cbc -md sha256 -iter 10000 -k "secretpassword"',posix=True)
_proc = subprocess.Popen(_cmd,stderr=subprocess.DEVNULL,stdout=subprocess.PIPE,stdin=subprocess.PIPE)
_out,_err = _proc.communicate(input=message.encode("utf-8"))
return b"03" + _out
def do_checks(self,debug=False,remote_ip=None,**kwargs):
self._getosinfo()
_errors = []
_failed_sections = []
_lines = ["<<<check_mk>>>"]
_lines.append("AgentOS: {os}".format(**self._info))
_lines.append(f"Version: {__VERSION__}")
_lines.append("Hostname: {hostname}".format(**self._info))
if self.onlyfrom:
_lines.append("OnlyFrom: {0}".format(",".join(self.onlyfrom)))
_lines.append(f"LocalDirectory: {LOCALDIR}")
for _check in dir(self):
if _check.startswith("check_"):
_name = _check.split("_",1)[1]
try:
_lines += getattr(self,_check)()
except:
_failed_sections.append(_name)
_errors.append(traceback.format_exc())
_lines.append("<<<local:sep(0)>>>")
for _check in dir(self):
if _check.startswith("checklocal_"):
_name = _check.split("_",1)[1]
try:
_lines += getattr(self,_check)()
except:
_failed_sections.append(_name)
_errors.append(traceback.format_exc())
if os.path.isdir(LOCALDIR):
for _local_file in glob.glob(f"{LOCALDIR}/**",recursive=True):
if os.path.isfile(_local_file) and os.access(_local_file,os.X_OK):
try:
_cachetime = int(_local_file.split(os.path.sep)[-2])
except:
_cachetime = 0
try:
_lines.append(self._run_cache_prog(_local_file,_cachetime))
except:
_errors.append(traceback.format_exc())
_lines.append("")
if debug:
sys.stderr.write("\n".join(_errors))
sys.stderr.flush()
if _failed_sections:
_lines.append("<<<check_mk>>>")
_lines.append("FailedPythonPlugins: {0}".format(",".join(_failed_sections)))
if self.encryptionkey:
return self.encrypt("\n".join(_lines),password=self.encryptionkey)
return "\n".join(_lines).encode("utf-8")
def _get_storedata(self,section,key):
with self._datastore_mutex:
return self._datastore.get(section,{}).get(key)
def _set_storedata(self,section,key,value):
with self._datastore_mutex:
if section not in self._datastore:
self._datastore[section] = object_dict()
self._datastore[section][key] = value
def _getosinfo(self):
_info = json.load(open("/usr/local/opnsense/version/core","r"))
_changelog = json.load(open("/usr/local/opnsense/changelog/index.json","r"))
_config_modified = os.stat("/conf/config.xml").st_mtime
try:
_latest_firmware = list(filter(lambda x: x.get("series") == _info.get("product_series"),_changelog))[-1]
_current_firmware = list(filter(lambda x: x.get("version") == _info.get("product_version").split("_")[0],_changelog))[0]
_current_firmware["age"] = int(time.time() - time.mktime(time.strptime(_current_firmware.get("date"),"%B %d, %Y")))
except:
raise
_lastest_firmware = {}
_current_firmware = {}
self._info = {
"os" : _info.get("product_name"),
"os_version" : _info.get("product_version"),
"version_age" : _current_firmware.get("age",0),
"config_age" : int(time.time() - _config_modified) ,
"last_configchange" : time.strftime("%H:%M %d.%m.%Y",time.localtime(_config_modified)),
"product_series" : _info.get("product_series"),
"latest_version" : _latest_firmware.get("version"),
"latest_date" : _latest_firmware.get("date"),
"hostname" : self._run_prog("hostname").strip(" \n")
}
@staticmethod
def ip2int(ipaddr):
return struct.unpack("!I",socket.inet_aton(ipaddr))[0]
@staticmethod
def int2ip(intaddr):
return socket.inet_ntoa(struct.pack("!I",intaddr))
def pidof(self,prog,default=None):
_allprogs = re.findall("(\w+)\s+(\d+)",self._run_prog("ps ax -c -o command,pid"))
return int(dict(_allprogs).get(prog,default))
def _config_reader(self,config=""):
_config = ELementTree.parse("/conf/config.xml")
_root = _config.getroot()
return etree_to_dict(_root).get("opnsense",{})
@staticmethod
def get_common_name(certrdn):
try:
return next(filter(lambda x: x.oid == x509.oid.NameOID.COMMON_NAME,certrdn)).value.strip()
except:
return str(certrdn)
def _certificate_parser(self):
self._certificate_timestamp = time.time()
self._certificate_store = {}
for _cert in self._config_reader().get("cert"):
try:
_certpem = base64.b64decode(_cert.get("crt"))
_x509cert = x509.load_pem_x509_certificate(_certpem,crypto_default_backend())
_cert["not_valid_before"] = _x509cert.not_valid_before.timestamp()
_cert["not_valid_after"] = _x509cert.not_valid_after.timestamp()
_cert["serial"] = _x509cert.serial_number
_cert["common_name"] = self.get_common_name(_x509cert.subject)
_cert["issuer"] = self.get_common_name(_x509cert.issuer)
except:
pass
self._certificate_store[_cert.get("refid")] = _cert
def _get_certificate(self,refid):
if time.time() - self._certificate_timestamp > 3600:
self._certificate_parser()
return self._certificate_store.get(refid)
def _get_certificate_by_cn(self,cn,caref=None):
if time.time() - self._certificate_timestamp > 3600:
self._certificate_parser()
if caref:
_ret = filter(lambda x: x.get("common_name") == cn and x.get("caref") == caref,self._certificate_store.values())
else:
_ret = filter(lambda x: x.get("common_name") == cn,self._certificate_store.values())
try:
return next(_ret)
except StopIteration:
return {}
def get_opnsense_ipaddr(self):
try:
_ret = {}
for _if,_ip,_mask in re.findall("^([\w_]+):\sflags=(?:8943|8051|8043).*?inet\s([\d.]+)\snetmask\s0x([a-f0-9]+)",self._run_prog("ifconfig"),re.DOTALL | re.M):
_ret[_if] = "{0}/{1}".format(_ip,str(bin(int(_mask,16))).count("1"))
return _ret
except:
return {}
def get_opnsense_interfaces(self):
_ifs = {}
#pprint(self._config_reader().get("interfaces"))
#sys.exit(0)
for _name,_interface in self._config_reader().get("interfaces",{}).items():
if _interface.get("enable") != "1":
continue
_desc = _interface.get("descr")
_ifs[_interface.get("if","_")] = _desc if _desc else _name.upper()
try:
_wgserver = self._config_reader().get("OPNsense").get("wireguard").get("server").get("servers").get("server")
if type(_wgserver) == dict:
_wgserver = [_wgserver]
_ifs.update(
dict(
map(
lambda x: ("wg{}".format(x.get("instance")),"Wireguard_{}".format(x.get("name").strip().replace(" ","_"))),
_wgserver
)
)
)
except:
pass
return _ifs
def checklocal_firmware(self):
if self._info.get("os_version") != self._info.get("latest_version"):
return ["1 Firmware update_available=1|last_updated={version_age}|apply_finish_time={config_age} Version {os_version} ({latest_version} available {latest_date}) Config changed: {last_configchange}".format(**self._info)]
return ["0 Firmware update_available=0|last_updated={version_age}|apply_finish_time={config_age} Version {os_version} Config changed: {last_configchange}".format(**self._info)]
def check_net(self):
_opnsense_ifs = self.get_opnsense_interfaces()
_now = int(time.time())
_ret = ["<<<statgrab_net>>>"]
_interface_status = dict(
map(lambda x: (x[0],(x[1:])),
re.findall("^(?P<iface>[\w.]+):.*?(?P<adminstate>UP|DOWN),.*?\n(?:\s+(?:media:.*?(?P<speed>\d+G?).*?\<(?P<duplex>.*?)\>|(?:status:\s(?P<operstate>[ \w]+))|).*?\n)*",
self._run_prog("ifconfig"),re.M)
)
)
_interface_data = self._run_prog("/usr/bin/netstat -i -b -d -n -W -f link").split("\n")
_header = _interface_data[0].lower()
_header = _header.replace("pkts","packets").replace("coll","collisions").replace("errs","error").replace("ibytes","rx").replace("obytes","tx")
_header = _header.split()
for _line in _interface_data[1:]:
_fields = _line.split()
if not _fields:
continue
_iface = _fields[0]
if _iface.replace("*","") in ("pflog0","lo0"):
continue
_ifconfig = _interface_status.get(_iface,("","","unknown",""))
_name = _opnsense_ifs.get(_iface)
if not _name:
continue
_ifacedict = dict(zip(_header,_fields))
_ifacedict.update({
"interface_name" : _name,
"duplex" : _ifconfig[2],
"speed" : _ifconfig[1].replace("G","000"),
"systime" : _now,
"up" : str(bool(_ifconfig[3] in ("active",""))).lower(),
"admin_status" : str(bool(_ifconfig[0] == "UP")).lower(),
"phys_address" : _ifacedict.get("address")
})
for _key,_val in _ifacedict.items():
if _key in ("name","network","address"):
continue
if type(_val) == str:
_val = _val.replace(" ","_")
if not _val:
continue
_ret.append(f"{_iface}.{_key} {_val}")
return _ret
def checklocal_services(self):
_phpcode = '<?php require_once("config.inc");require_once("system.inc"); require_once("plugins.inc"); require_once("util.inc"); foreach(plugins_services() as $_service) { printf("%s;%s;%s\n",$_service["name"],$_service["description"],service_status($_service));} ?>'
_proc = subprocess.Popen(["php"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL,encoding="utf-8")
_data,_ = _proc.communicate(input=_phpcode,timeout=15)
_services = []
for _service in _data.strip().split("\n"):
_services.append(_service.split(";"))
_num_services = len(_services)
_stopped_services = list(filter(lambda x: x[2] != '1',_services))
_num_stopped = len(_stopped_services)
_num_running = _num_services - _num_stopped
_stopped_services = ", ".join(map(lambda x: x[1],_stopped_services))
if _num_stopped > 0:
return [f"2 Services running_services={_num_running}|stopped_service={_num_stopped} Services: {_stopped_services} not running"]
return [f"0 Services running_services={_num_running}|stopped_service={_num_stopped} All Services running"]
def check_dhcp(self):
_ret = ["<<<isc_dhcpd>>>"]
_ret.append("[general]\nPID: {0}".format(self.pidof("dhcpd",-1)))
_dhcpleases = open("/var/dhcpd/var/db/dhcpd.leases","r").read()
## FIXME
#_dhcpleases_dict = dict(map(lambda x: (self.ip2int(x[0]),x[1]),re.findall(r"lease\s(?P<ipaddr>[0-9.]+)\s\{.*?.\n\s+binding state\s(?P<state>\w+).*?\}",_dhcpleases,re.DOTALL)))
_dhcpleases_dict = dict(re.findall(r"lease\s(?P<ipaddr>[0-9.]+)\s\{.*?.\n\s+binding state\s(?P<state>active).*?\}",_dhcpleases,re.DOTALL))
_dhcpconf = open("/var/dhcpd/etc/dhcpd.conf","r").read()
_ret.append("[pools]")
for _subnet in re.finditer(r"subnet\s(?P<subnet>[0-9.]+)\snetmask\s(?P<netmask>[0-9.]+)\s\{.*?(?:pool\s\{.*?\}.*?)*}",_dhcpconf,re.DOTALL):
#_cidr = bin(self.ip2int(_subnet.group(2))).count("1")
#_available = 0
for _pool in re.finditer("pool\s\{.*?range\s(?P<start>[0-9.]+)\s(?P<end>[0-9.]+).*?\}",_subnet.group(0),re.DOTALL):
#_start,_end = self.ip2int(_pool.group(1)), self.ip2int(_pool.group(2))
#_ips_in_pool = filter(lambda x: _start < x[0] < _end,_dhcpleases_dict.items())
#pprint(_dhcpleases_dict)
#pprint(sorted(list(map(lambda x: (self._int2ip(x[0]),x[1]),_ips_in_pool))))
#_available += (_end - _start)
_ret.append("{0}\t{1}".format(_pool.group(1),_pool.group(2)))
#_ret.append("DHCP_{0}/{1} {2}".format(_subnet.group(1),_cidr,_available))
_ret.append("[leases]")
for _ip in sorted(_dhcpleases_dict.keys()):
_ret.append(_ip)
return _ret
@staticmethod
def _read_from_openvpnsocket(vpnsocket,cmd):
_sock = socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)
try:
_sock.connect(vpnsocket)
assert (_sock.recv(4096).decode("utf-8")).startswith(">INFO")
cmd = cmd.strip() + "\n"
_sock.send(cmd.encode("utf-8"))
_data = ""
while True:
_socket_data = _sock.recv(4096).decode("utf-8")
_data += _socket_data
if _data.strip().endswith("END") or _data.strip().startswith("SUCCESS:") or _data.strip().startswith("ERROR:"):
break
return _data
finally:
if _sock:
_sock.send("quit\n".encode("utf-8"))
_sock.close()
_sock = None
return ""
def _get_traffic(self,modul,interface,totalbytesin,totalbytesout):
_hist_data = self._get_storedata(modul,interface)
_slot = int(time.time())
_slot -= _slot%60
_hist_slot = 0
_traffic_in = _traffic_out = 0
if _hist_data:
_hist_slot,_hist_bytesin, _hist_bytesout = _hist_data
_traffic_in = int(totalbytesin -_hist_bytesin) / max(1,_slot - _hist_slot)
_traffic_out = int(totalbytesout - _hist_bytesout) / max(1,_slot - _hist_slot)
if _hist_slot != _slot:
self._set_storedata(modul,interface,(_slot,totalbytesin,totalbytesout))
return _traffic_in,_traffic_out
@staticmethod
def _get_dpinger_gateway(gateway):
_path = "/var/run/dpinger_{0}.sock".format(gateway)
if os.path.exists(_path):
_sock = socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)
try:
_sock.connect(_path)
_data = _sock.recv(1024).decode("utf-8").strip()
_name, _rtt, _rttsd, _loss = re.findall("(\w+)\s(\d+)\s(\d+)\s(\d+)$",_data)[0]
assert _name.strip() == gateway
return int(_rtt)/1000.0,int(_rttsd)/1000.0, int(_loss)
except:
raise
return -1,-1,-1
def checklocal_gateway(self):
_ret = []
_gateway_items = self._config_reader().get("gateways").get("gateway_item",[])
if type(_gateway_items) != list:
_gateway_items = [_gateway_items] if _gateway_items else []
_interfaces = self._config_reader().get("interfaces",{})
_ipaddresses = self.get_opnsense_ipaddr()
for _gateway in _gateway_items:
if type(_gateway.get("descr")) != str:
_gateway["descr"] = _gateway.get("name")
if _gateway.get("monitor_disable") == "1" or _gateway.get("disabled") == "1":
continue
_interface = _interfaces.get(_gateway.get("interface"),{})
_gateway["realinterface"] = _interface.get("if")
if _gateway.get("ipprotocol") == "inet":
_gateway["ipaddr"] = _ipaddresses.get(_interface.get("if"))
else:
_gateway["ipaddr"] = ""
_gateway["rtt"], _gateway["rttsd"], _gateway["loss"] = self._get_dpinger_gateway(_gateway.get("name"))
_gateway["status"] = 0
if _gateway.get("loss") > 0 or _gateway.get("rtt") > 100:
_gateway["status"] = 1
if _gateway.get("loss") > 90 or _gateway.get("loss") == -1:
_gateway["status"] = 2
_ret.append("{status} \"Gateway {descr}\" rtt={rtt}|rttsd={rttsd}|loss={loss} Gateway on Interface: {realinterface} {ipaddr}".format(**_gateway))
return _ret
def checklocal_openvpn(self):
_ret = []
_cfr = self._config_reader().get("openvpn")
if type(_cfr) != dict:
return _ret
_cso = _cfr.get("openvpn-csc")
_monitored_clients = {}
if type(_cso) == dict:
_cso = [_cso]
if type(_cso) == list:
_monitored_clients = dict(map(lambda x: (x.get("common_name").upper(),dict(x,current=[])),_cso))
_now = time.time()
_vpnclient = _cfr.get("openvpn-client",[])
_vpnserver = _cfr.get("openvpn-server",[])
if type(_vpnserver) != list:
_vpnserver = [_vpnserver] if _vpnserver else []
if type(_vpnclient) != list:
_vpnclient = [_vpnclient] if _vpnclient else []
for _server in _vpnserver + _vpnclient:
## server_tls, p2p_shared_key p2p_tls
_server["name"] = _server.get("description") if _server.get("description").strip() else "OpenVPN_{protocoll}_{local_port}".format(**_server)
_caref = _server.get("caref")
_server_cert = self._get_certificate(_server.get("certref"))
_server["status"] = 3
_server["expiredays"] = 0
_server["expiredate"] = "no certificate found"
if _server_cert:
_notvalidafter = _server_cert.get("not_valid_after")
_server["expiredays"] = int((_notvalidafter - _now) / 86400)
_server["expiredate"] = time.strftime("Cert Expire: %d.%m.%Y",time.localtime(_notvalidafter))
if _server["expiredays"] < 61:
_server["status"] = 2 if _server["expiredays"] < 31 else 1
else:
_server["expiredate"] = "\\n" + _server["expiredate"]
_server["type"] = "server" if _server.get("local_port") else "client"
if _server.get("mode") in ("p2p_shared_key","p2p_tls"):
_unix = "/var/etc/openvpn/{type}{vpnid}.sock".format(**_server)
try:
_server["bytesin"], _server["bytesout"] = self._get_traffic("openvpn",
"SRV_{name}".format(**_server),
*(map(lambda x: int(x),re.findall("bytes\w+=(\d+)",self._read_from_openvpnsocket(_unix,"load-stats"))))
)
_laststate = self._read_from_openvpnsocket(_unix,"state 1").strip().split("\r\n")[-2]
_timestamp, _server["connstate"], _data = _laststate.split(",",2)
if _server["connstate"] == "CONNECTED":
_data = _data.split(",")
_server["vpn_ipaddr"] = _data[1]
_server["remote_ipaddr"] = _data[2]
_server["remote_port"] = _data[3]
_server["source_addr"] = _data[4]
_server["status"] = 0 if _server["status"] == 3 else _server["status"]
_ret.append('{status} "OpenVPN Connection: {name}" connections_ssl_vpn=1;;|if_in_octets={bytesin}|if_out_octets={bytesout}|expiredays={expiredays} Connected {remote_ipaddr}:{remote_port} {vpn_ipaddr} {expiredate}\Source IP: {source_addr}'.format(**_server))
else:
if _server["type"] == "client":
_server["status"] = 2
_ret.append('{status} "OpenVPN Connection: {name}" connections_ssl_vpn=0;;|if_in_octets={bytesin}|if_out_octets={bytesout}|expiredays={expiredays} {connstate} {expiredate}'.format(**_server))
else:
_server["status"] = 1 if _server["status"] != 2 else 2
_ret.append('{status} "OpenVPN Connection: {name}" connections_ssl_vpn=0;;|if_in_octets={bytesin}|if_out_octets={bytesout}|expiredays={expiredays} waiting on Port {local_port}/{protocol} {expiredate}'.format(**_server))
except:
_ret.append('2 "OpenVPN Connection: {name}" connections_ssl_vpn=0;;|expiredays={expiredays}|if_in_octets=0|if_out_octets=0 Server down Port:/{protocol} {expiredate}'.format(**_server))
continue
else:
if not _server.get("maxclients"):
_max_clients = ipaddress.IPv4Network(_server.get("tunnel_network")).num_addresses -2
if _server.get("topology_subnet") != "yes":
_max_clients = max(1,int(_max_clients/4)) ## p2p
_server["maxclients"] = _max_clients
try:
_unix = "/var/etc/openvpn/{type}{vpnid}.sock".format(**_server)
try:
_server["bytesin"], _server["bytesout"] = self._get_traffic("openvpn",
"SRV_{name}".format(**_server),
*(map(lambda x: int(x),re.findall("bytes\w+=(\d+)",self._read_from_openvpnsocket(_unix,"load-stats"))))
)
_server["status"] = 0 if _server["status"] == 3 else _server["status"]
except:
_server["bytesin"], _server["bytesout"] = 0,0
raise
_number_of_clients = 0
_now = int(time.time())
_response = self._read_from_openvpnsocket(_unix,"status 2")
for _client_match in re.finditer("^CLIENT_LIST,(.*?)$",_response,re.M):
_number_of_clients += 1
_client_raw = list(map(lambda x: x.strip(),_client_match.group(1).split(",")))
_client = {
"server" : _server.get("name"),
"common_name" : _client_raw[0],
"remote_ip" : _client_raw[1].split(":")[0],
"vpn_ip" : _client_raw[2],
"vpn_ipv6" : _client_raw[3],
"bytes_received" : int(_client_raw[4]),
"bytes_sent" : int(_client_raw[5]),
"uptime" : _now - int(_client_raw[7]),
"username" : _client_raw[8] if _client_raw[8] != "UNDEF" else _client_raw[0],
"clientid" : int(_client_raw[9]),
"cipher" : _client_raw[11].strip("\r\n")
}
if _client["username"].upper() in _monitored_clients:
_monitored_clients[_client["username"].upper()]["current"].append(_client)
_server["clientcount"] = _number_of_clients
_ret.append('{status} "OpenVPN Server: {name}" connections_ssl_vpn={clientcount};;{maxclients}|if_in_octets={bytesin}|if_out_octets={bytesout}|expiredays={expiredays} {clientcount}/{maxclients} Connections Port:{local_port}/{protocol} {expiredate}'.format(**_server))
except:
_ret.append('2 "OpenVPN Server: {name}" connections_ssl_vpn=0;;{maxclients}|expiredays={expiredays}|if_in_octets=0|if_out_octets=0| Server down Port:{local_port}/{protocol} {expiredate}'.format(**_server))
for _client in _monitored_clients.values():
_current_conn = _client.get("current",[])
if not _client.get("description"):
_client["description"] = _client.get("common_name")
_client["description"] = _client["description"].strip(" \r\n")
_client["expiredays"] = 0
_client["expiredate"] = "no certificate found"
_client["status"] = 0
_cert = self._get_certificate_by_cn(_client.get("common_name"))
if _cert:
_notvalidafter = _cert.get("not_valid_after")
_client["expiredays"] = int((_notvalidafter - _now) / 86400)
_client["expiredate"] = time.strftime("Cert Expire: %d.%m.%Y",time.localtime(_notvalidafter))
if _client["expiredays"] < 61:
_client["status"] = 2 if _client["expiredays"] < 31 else 1
else:
_client["expiredate"] = "\\n" + _client["expiredate"]
if _current_conn:
_client["uptime"] = max(map(lambda x: x.get("uptime"),_current_conn))
_client["count"] = len(_current_conn)
_client["bytes_received"], _client["bytes_sent"] = self._get_traffic("openvpn",
"CL_{description}".format(**_client),
sum(map(lambda x: x.get("bytes_received"),_current_conn)),
sum(map(lambda x: x.get("bytes_sent"),_current_conn))
)
_client["longdescr"] = ""
for _conn in _current_conn:
_client["longdescr"] += "Server:{server} {remote_ip}:{vpn_ip} {cipher} ".format(**_conn)
_ret.append('{status} "OpenVPN Client: {description}" connectiontime={uptime}|connections_ssl_vpn={count}|if_in_octets={bytes_received}|if_out_octets={bytes_sent}|expiredays={expiredays} {longdescr} {expiredate}'.format(**_client))
else:
_ret.append('2 "OpenVPN Client: {description}" connectiontime=0|connections_ssl_vpn=0|if_in_octets=0|if_out_octets=0|expiredays={expiredays} Nicht verbunden {expiredate}'.format(**_client))
return _ret
def checklocal_ipsec(self):
_ret = []
_json_data = self._run_prog("/usr/local/opnsense/scripts/ipsec/list_status.py")
if len(_json_data.strip()) < 20:
return []
for _con in json.loads(_json_data).values():
_childsas = None
_con["status"] = 2
_con["bytes_received"] = 0
_con["bytes_sent"] = 0
for _sas in _con.get("sas",[]):
_con["state"] = _sas.get("state","unknown")
_childsas = filter(lambda x: x.get("state") == "INSTALLED",_sas.get("child-sas").values())
try:
_childsas = next(_childsas)
_con["remote-host"] = _sas.get("remote-host")
_connecttime = int(_childsas.get("install-time",0))
_con["bytes_received"] = int(int(_childsas.get("bytes-in",0)) /_connecttime)
_con["bytes_sent"] = int(int(_childsas.get("bytes-out",0)) / _connecttime)
_con["status"] = 0
break
except StopIteration:
pass
if _childsas:
_ret.append("{status} \"IPsec Tunnel: {remote-id}\" if_in_octets={bytes_received}|if_out_octets={bytes_sent} {state} {local-id} - {remote-id}({remote-host})".format(**_con))
return _ret
def checklocal_wireguard(self):
_ret = []
try:
_clients = self._config_reader().get("OPNsense").get("wireguard").get("client").get("clients").get("client")
if type(_clients) != list:
_clients = [_clients] if _clients else []
_clients = dict(map(lambda x: (x.get("pubkey"),x),_clients))
except:
return []
_now = time.time()
for _client in _clients.values(): ## fill defaults
_client["interface"] = ""
_client["endpoint"] = ""
_client["last_handshake"] = 0
_client["bytes_received"] = 0
_client["bytes_sent"] = 0
_client["status"] = 2
_dump = self._run_prog(["wg","show","all","dump"]).strip()
for _line in _dump.split("\n"):
_values = _line.split("\t")
if len(_values) != 9:
continue
_client = _clients.get(_values[1].strip())
if not _client:
continue
_client["interface"] = _values[0].strip()
_client["endpoint"] = _values[3].strip().split(":")[0]
_client["last_handshake"] = int(_values[5].strip())
_client["bytes_received"], _client["bytes_sent"] = self._get_traffic("wireguard","",int(_values[6].strip()),int(_values[7].strip()))
_client["status"] = 2 if _now - _client["last_handshake"] > 300 else 0 ## 5min timeout
for _client in _clients.values():
if _client.get("status") == 2 and _client.get("endpoint") != "":
_client["endpoint"] = "last IP:" + _client["endpoint"]
_ret.append('{status} "WireGuard Client: {name}" if_in_octets={bytes_received}|if_out_octets={bytes_sent} {interface}: {endpoint} - {tunneladdress}'.format(**_client))
return _ret
def checklocal_unbound(self):
_ret = []
try:
_output = self._run_prog(["/usr/local/sbin/unbound-control", "-c", "/var/unbound/unbound.conf", "stats_noreset"])
_unbound_stat = dict(
map(
lambda x: (x[0].replace(".","_"),float(x[1])),
re.findall("total\.([\w.]+)=([\d.]+)",_output)
)
)
_ret.append("0 \"Unbound DNS\" dns_successes={num_queries}|dns_recursion={num_recursivereplies}|dns_cachehits={num_cachehits}|dns_cachemiss={num_cachemiss}|avg_response_time={recursion_time_avg} Unbound running".format(**_unbound_stat))
except:
_ret.append("2 \"Unbound DNS\" dns_successes=0|dns_recursion=0|dns_cachehits=0|dns_cachemiss=0|avg_response_time=0 Unbound not running")
return _ret
def checklocal_acmeclient(self):
_ret = []
_now = time.time()
try:
_acmecerts = self._config_reader().get("OPNsense").get("AcmeClient").get("certificates").get("certificate")
if type(_acmecerts) == dict:
_acmecerts = [_acmecerts]
except:
_acmecerts = []
for _cert_info in _acmecerts:
if _cert_info.get("enabled") != "1":
continue
_certificate = self._get_certificate(_cert_info.get("certRefId"))
if type(_certificate) != dict:
_certificate = {}
_expiredays = _certificate.get("not_valid_after",_now) - _now
_certificate_age = _now - int(_certificate.get("not_valid_before",_cert_info.get("lastUpdate",_now)))
_cert_info["age"] = int(_certificate_age)
_cert_info["status"] = 0
if _cert_info.get("statusCode") == "200":
if _certificate_age < int(_cert_info.get("renewInterval",0)):
_cert_info["status"] = 1
else:
_cert_info["status"] = 1
if _expiredays < 10:
_cert_info["status"] = 2
if not _cert_info.get("description"):
_cert_info["description"] = _cert_info.get("name",_certificate.get("common_name"))
_cert_info["issuer"] = _certificate.get("issuer")
_cert_info["lastupdatedate"] = time.strftime("%d.%m.%Y",time.localtime(int(_cert_info.get("lastUpdate",0))))
_cert_info["expiredate"] = time.strftime("%d.%m.%Y",time.localtime(_certificate.get("not_valid_after",0)))
_ret.append("{status} \"ACME Cert: {description}\" age={age} Last Update: {lastupdatedate} Status: {statusCode} Cert expire: {expiredate}".format(**_cert_info))
return _ret
def check_haproxy(self):
_ret = ["<<<haproxy:sep(44)>>>"]
_path = "/var/run/haproxy.socket"
try:
_haproxy_servers = dict(map(lambda x: (x.get("@uuid"),x),self._config_reader().get("OPNsense").get("HAProxy").get("servers").get("server")))
_healthcheck_servers = []
for _backend in self._config_reader().get("OPNsense").get("HAProxy").get("backends").get("backend"):
if _backend.get("healthCheckEnabled") == "1" and _backend.get("healthCheck") != None:
for _server_id in _backend.get("linkedServers","").split(","):
_server = _haproxy_servers.get(_server_id)
_healthcheck_servers.append("{0},{1}".format(_backend.get("name",""),_server.get("name","")))
except:
return []
if os.path.exists(_path):
_sock = socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)
_sock.connect(_path)
_sock.send("show stat\n".encode("utf-8"))
_data = ""
while True:
_sockdata = _sock.recv(4096)
if not _sockdata:
break
_data += _sockdata.decode("utf-8")
for _line in _data.split("\n"):
_linedata = _line.split(",")
if len(_linedata) < 33:
continue
#pprint(list(enumerate(_linedata)))
if _linedata[32] == "2":
if "{0},{1}".format(*_linedata) not in _healthcheck_servers:
continue ## ignore backends check disabled
_ret.append(_line)
return _ret
def check_smartinfo(self):
if not os.path.exists("/usr/local/sbin/smartctl"):
return []
REGEX_DISCPATH = re.compile("(sd[a-z]+|da[0-9]+|nvme[0-9]+|ada[0-9]+)$")
_ret = ["<<<disk_smart_info:sep(124)>>>"]
for _dev in filter(lambda x: REGEX_DISCPATH.match(x),os.listdir("/dev/")):
try:
_ret.append(str(smart_disc(_dev)))
except:
pass
return _ret
def check_df(self):
_ret = ["<<<df>>>"]
_ret += self._run_prog("df -kTP -t ufs").split("\n")[1:]
return _ret
def check_kernel(self):
_ret = ["<<<kernel>>>"]
_out = self._run_prog("sysctl -a",timeout=10)
_kernel = dict([_v.split(": ") for _v in _out.split("\n") if len(_v.split(": ")) == 2])
_ret.append("{0:.0f}".format(time.time()))
_ret.append("cpu {0} {1} {2} {4} {3}".format(*(_kernel.get("kern.cp_time","").split(" "))))
_ret.append("ctxt {0}".format(_kernel.get("vm.stats.sys.v_swtch")))
_sum = sum(map(lambda x: int(x[1]),(filter(lambda x: x[0] in ("vm.stats.vm.v_forks","vm.stats.vm.v_vforks","vm.stats.vm.v_rforks","vm.stats.vm.v_kthreads"),_kernel.items()))))
_ret.append("processes {0}".format(_sum))
return _ret
def check_zpool(self):
_ret = ["<<<zpool_status>>>"]
try:
for _line in self._run_prog("zpool status -x").split("\n"):
if _line.find("errors: No known data errors") == -1:
_ret.append(_line)
except:
return []
return _ret
def check_zfs(self):
_ret = ["<<<zfsget>>>"]
_ret.append(self._run_prog("zfs get -t filesystem,volume -Hp name,quota,used,avail,mountpoint,type"))
_ret.append("[df]")
_ret.append(self._run_prog("df -kP -t zfs"))
_ret.append("<<<zfs_arc_cache>>>")
_ret.append(self._run_prog("sysctl -q kstat.zfs.misc.arcstats").replace("kstat.zfs.misc.arcstats.","").replace(": "," = ").strip())
return _ret
def check_mounts(self):
_ret = ["<<<mounts>>>"]
_ret.append(self._run_prog("mount -p -t ufs").strip())
return _ret
def check_cpu(self):
_ret = ["<<<cpu>>>"]
_loadavg = self._run_prog("sysctl -n vm.loadavg").strip("{} \n")
_proc = self._run_prog("top -b -n 1").split("\n")[1].split(" ")
_proc = "{0}/{1}".format(_proc[3],_proc[0])
_lastpid = self._run_prog("sysctl -n kern.lastpid").strip(" \n")
_ncpu = self._run_prog("sysctl -n hw.ncpu").strip(" \n")
_ret.append(f"{_loadavg} {_proc} {_lastpid} {_ncpu}")
return _ret
def check_netctr(self):
_ret = ["<<<netctr>>>"]
_out = self._run_prog("netstat -inb")
for _line in re.finditer("^(?!Name|lo|plip)(?P<iface>\w+)\s+(?P<mtu>\d+).*?Link.*?\s+.*?\s+(?P<inpkts>\d+)\s+(?P<inerr>\d+)\s+(?P<indrop>\d+)\s+(?P<inbytes>\d+)\s+(?P<outpkts>\d+)\s+(?P<outerr>\d+)\s+(?P<outbytes>\d+)\s+(?P<coll>\d+)$",_out,re.M):
_ret.append("{iface} {inbytes} {inpkts} {inerr} {indrop} 0 0 0 0 {outbytes} {outpkts} {outerr} 0 0 0 0 0".format(**_line.groupdict()))
return _ret
def check_ntp(self):
_ret = ["<<<ntp>>>"]
for _line in self._run_prog("ntpq -np",timeout=30).split("\n")[2:]:
if _line.strip():
_ret.append("{0} {1}".format(_line[0],_line[1:]))
return _ret
def check_tcp(self):
_ret = ["<<<tcp_conn_stats>>>"]
_out = self._run_prog("netstat -na")
counts = Counter(re.findall("ESTABLISHED|LISTEN",_out))
for _key,_val in counts.items():
_ret.append(f"{_key} {_val}")
return _ret
def check_ps(self):
_ret = ["<<<ps>>>"]
_out = self._run_prog("ps ax -o state,user,vsz,rss,pcpu,command")
for _line in re.finditer("^(?P<stat>\w+)\s+(?P<user>\w+)\s+(?P<vsz>\d+)\s+(?P<rss>\d+)\s+(?P<cpu>[\d.]+)\s+(?P<command>.*)$",_out,re.M):
_ret.append("({user},{vsz},{rss},{cpu}) {command}".format(**_line.groupdict()))
return _ret
def check_uptime(self):
_ret = ["<<<uptime>>>"]
_uptime_sec = time.time() - int(self._run_prog("sysctl -n kern.boottime").split(" ")[3].strip(" ,"))
_idle_sec = re.findall("(\d+):[\d.]+\s+\[idle\]",self._run_prog("ps axw"))[0]
_ret.append(f"{_uptime_sec} {_idle_sec}")
return _ret
def _run_prog(self,cmdline="",*args,shell=False,timeout=60):
if type(cmdline) == str:
_process = shlex.split(cmdline,posix=True)
else:
_process = cmdline
try:
return subprocess.check_output(_process,encoding="utf-8",shell=shell,stderr=subprocess.DEVNULL,timeout=timeout)
except subprocess.CalledProcessError as e:
return ""
except subprocess.TimeoutExpired:
return ""
def _run_cache_prog(self,cmdline="",cachetime=10,*args,shell=False):
if type(cmdline) == str:
_process = shlex.split(cmdline,posix=True)
else:
_process = cmdline
_process_id = "".join(_process)
_runner = self._check_cache.get(_process_id)
if _runner == None:
_runner = checkmk_cached_process(_process,shell=shell)
self._check_cache[_process_id] = _runner
return _runner.get(cachetime)
class checkmk_cached_process(object):
def __init__(self,process,shell=False):
self._processs = process
self._islocal = os.path.dirname(process[0]).startswith(LOCALDIR)
self._shell = shell
self._mutex = threading.Lock()
with self._mutex:
self._data = (0,"")
self._thread = None
def _runner(self,timeout):
try:
_data = subprocess.check_output(self._processs,shell=self._shell,encoding="utf-8",stderr=subprocess.DEVNULL,timeout=timeout)
except subprocess.CalledProcessError as e:
_data = ""
except subprocess.TimeoutExpired:
_data = ""
with self._mutex:
self._data = (int(time.time()),_data)
self._thread = None
def get(self,cachetime):
with self._mutex:
_now = time.time()
_mtime = self._data[0]
if _now - _mtime > cachetime or cachetime == 0:
if not self._thread:
if cachetime > 0:
_timeout = cachetime*2-1
else:
_timeout = None
with self._mutex:
self._thread = threading.Thread(target=self._runner,args=[_timeout])
self._thread.start()
self._thread.join(30) ## waitmax
with self._mutex:
_mtime, _data = self._data
if not _data.strip():
return ""
if self._islocal:
_data = "".join([f"cached({_mtime},{cachetime}) {_line}" for _line in _data.splitlines(True) if len(_line.strip()) > 0])
else:
_data = re.sub("\B[<]{3}(.*?)[>]{3}\B",f"<<<\\1:cached({_mtime},{cachetime})>>>",_data)
return _data
class checkmk_server(TCPServer,checkmk_checker):
def __init__(self,port,pidfile,user,onlyfrom=None,encryptionkey=None,**kwargs):
self.pidfile = pidfile
self.onlyfrom=onlyfrom.split(",") if onlyfrom else None
self.encryptionkey = encryptionkey
self._mutex = threading.Lock()
self.user = pwd.getpwnam(user)
self.allow_reuse_address = True
TCPServer.__init__(self,("",port),checkmk_handler,bind_and_activate=False)
def _change_user(self):
_, _, _uid, _gid, _, _, _ = self.user
if os.getuid() != _uid:
os.setgid(_gid)
os.setuid(_uid)
def verify_request(self, request, client_address):
if self.onlyfrom and client_address[0] not in self.onlyfrom:
return False
return True
def server_start(self):
sys.stderr.write("starting checkmk_agent\n")
sys.stderr.flush()
signal.signal(signal.SIGTERM, self._signal_handler)
signal.signal(signal.SIGINT, self._signal_handler)
signal.signal(signal.SIGHUP, self._signal_handler)
self._change_user()
try:
self.server_bind()
self.server_activate()
except:
self.server_close()
raise