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Barracuda CloudGen Firewall

Best Practice - Core System Configuration Files and Ports Overview

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The underlying Linux system is designed to serve as a basis for the Barracuda CloudGen Firewall. Direct interfering on the command line is not necessary for normal operation. Such operations should be carried out only by authorized personnel with excellent knowledge of Linux systems and its special Barracuda Networks implementation.

The Barracuda CloudGen Firewall system basically consists of three parts. The following table provides a general overview of the Barracuda CloudGen Firewall OS Linux system and its licensing concepts:

LayerDescriptionLicensing
Basic Linux

Standard Linux system with the modified NGFW OS kernel. Kernel sources are a part of the distribution.

Except for the Firewall engine, mostly under GPL or other Open Source Licenses.

Barracuda CloudGen networking

Handles all steps dealing with networking.

Barracuda Networks Public License. Can be used freely for all purposes except commercial redistribution.

Barracuda CloudGen operative

Operative Barracuda Networks Software; consists of box services (logging, statistics, control) and server (for example VPN, mail gateway, DNS, …)

Proprietary Barracuda Networks License.

Networking Layer

The Barracuda CloudGen Firewall OS networking layer is installed by the phionetc_box package. It is called phionetc_box because almost all relevant files live in the directory /etc/phion. The main purpose of the package is to control every part of the system that communicates over the network. In addition to the Barracuda CloudGen Firewall software modules, there are other packages like openssh or ntp that get their configuration and are started by specific scripts.

Configuration Files

There are three configuration files steering and controlling the networking behavior of the system: 

  • /etc/phion/options
  • /etc/phion/boxadm.conf
  • /etc/phion/boxnet.conf 

The options file is the only one that is not edited through the Barracuda Firewall Admin GUI. Template of the options file:

 

#######
## Systemwide options
## File is sourced by several start scripts
##
# start networking at all?
BOX_NETWORK="Y"
# Number of retries to bring up all devices, sometimes useful for token ring devices
NET_RETRY=0
# should the NGFW Subsystem be started ?
PHION_START="Y"
#for some historical reason: should the NetDB subsystem be started? 
#CAUTION: Activate only if you know very well what you are doing.
NETDB_START="N"
# for advanced Servers
START_ORA="N" #Y/N start ORACLE on BOOT
START_ADABAS="N" #Y/N start ADABAS on BOOT
  • BOX_NETWORK  Do not change. If you do set it to N, the Barracuda CloudGen networking and the services depending on it will not start. The Barracuda CloudGen Firewall will not be functional if this option is set.
  • NET_RETRY  Number of retries to establish a network link. 
  • PHION_START – If set to N, the Barracuda CloudGen Firewall OS operative layer will not be started at all. The Barracuda CloudGen Firewall will not be functional if this option is set to N.
  • NETDB_START  Only of use if you have a legacy unit with a NetDB database system on it.
  • START_ORA and START_ADABAS  Only of use for a Master configuration server with an Oracle or ADABAS D database. 

The boxadm.conf file holds all information that does not need a network restart to be activated. In addition, it also holds information for Barracuda CloudGen Firewall box services. An example of an operative configuration file:

ACLLIST[] = 10.0.0.8/29 10.0.0.231
ACTBOXSERVICES = y
DNSSERVER[] = 10.1.103.179 10.1.100.204
DOMAIN = m086
ENABLESHOSTS = y
MAINADMIN = n
MASTER[] = 10.1.17.42
RID = 86
RMASTER[] = 10.1.17.42
RPASSWD = $1$someMD5encryption
SPASSWD = $1$someMD5encryption
STARTNTP = y
STATISTICS = y
SYNC = y
TMASTER[] = 10.1.16.21
TZONE = Europe/Vienna
UTC = y
[boxtuning]
FILEMAX = 32768
IDETUNING = y
INODEMAX = 65536
SYSTUNING = n

For an explanation of the parameters, see How to Configure Advanced Barracuda OS System Settings.

Be extremely cautious when changing these files on the command line.

The boxnet.conf file holds all information that deals with network connections. These are the hostname and the network interfaces, IP addresses and routing information. Again, let us have a look on a sample file:

HOSTNAME = sega
[addnet_dmz]
BIND = n
CRIT = y
DEV = eth1
IP = 192.168.32.1
IPCHAINS = y
MASK = 8
PING = y
[addroute_default
]
DEST =
195.23.11.6
DEV =
FOREIGN = y
MASK = 32
PREF =
REACHIP[] =
SRC =
TARGET = 0.0.0.0
TYPE = gw
[addroute_QA]
DEST = 10.0.0.244
DEV = eth0
FOREIGN = y
MASK = 8
SRC = 10.0.0.8
TARGET = 192.168.10.0
TYPE = gw
[boxnet]
DEV = eth0
IP = 10.0.0.8
MASK = 8
[cards_eepro]
MOD = eepro100.o
MODOPTIONS[] =
NUM = 1
TYPE = eth
[cards_realtek]
MOD = rtl18139.o
MODOPTIONS[] =
For an explanation of the parameters, see How to Configure Advanced Barracuda OS System Settings.
Activation Scripts

There are two scripts that are intended to be started from the command line: 

  • /etc/rc.d/init.d/phion (which is actually a link to /etc/phion/rc.d/phionrc).
  • /etc/phion/bin/activate 

All other scripts should not be started on the command line but are invoked by the 2 scripts above.

Operative Layer

Static Data

The whole operative date resides in /opt/phion

It is not recommended to change anything below this directory.

The full configuration of a Barracuda CloudGen Firewall box is held under /opt/phion/config/active. The configuration files may be modified manually by a Barracuda Networks support engineer or by a specially trained system engineer. If you are not absolutely sure about what you are doing, do not change anything here.

Dynamic Data

Log files and statistics data reside in /var/phion. This directory has the following substructure: 

  • /var/phion/logs – All log files are stored here. You can read it with any editor.

    DO NOT write to it, DO NOT rename it, DO NOT put any files in here. Any manual action can result in strange behavior of the log interface.

  • /var/phion/stat – Root directory for the statistics data structure. The data files are Berkeley DB files in binary form. They can be viewed with the showstat utility (/opt/phion/bin/).

    Again: Do NOT change anything in this directory manually.

  • /var/phion/logcache – Home of the Log Access Files (*.laf). These are Berkeley DB files for fast access to large log files.

  • /var/phion/run/<module> – Services may store operational data in these directories.

Intervention on command line is generally not intended on the NGFW OS operative layer. Nevertheless, there is one powerful tool to steer the processes. It can be used to gather comprehensive information about system state, routing, servers, processes. Furthermore, it can start / stop / block / disable servers and box processes. It is called phionctrl and resides in /opt/phion/bin. For more information, see phionctrl.

Ports Overview

The following table enlists the ports of a Barracuda CloudGen Firewall / Control Center that are required for communication:

PortProtocolTypeDaemonTraffic Direction
22TCPservicesshd (SSH)inbound firewall and Control Center
691 and 443TCP/UDPservice

vpn

inbound firewall
450TCPservicefwauthinbound firewall (block URL notification)
680TCPservice

FW-audit (Firewall Audit Viewer)

inbound firewall and Control Center
688TCPservice

firewall (Firewall Service)

inbound firewall and Control Center
689UDPbox

controld/HA-Sync

inbound and outbound for both firewall and Control Center
692TCP/UDPVPN

management tunnel

inbound Control Center / Access Controller
694TCPVPNAutoVPN TINA tunnelinbound and outbound for firewall
801TCPbox 

controld/status (Control Status)

inbound and outbound for both firewall and Control Center
801UDPbox 

controld/ HA-heartbeat

inbound and outbound for both firewall and Control Center
802TCPbox 

phibsd

local listener only
803TCPbox 

logd (Log-Viewer)

inbound firewall (Barracuda Firewall Admin UI)
805TCPbox 

distd

inbound firewall and Control Center
806TCPservice

SPoE (Single Point of Entry Control Center)
and
qstatd (Statistics Viewer)

inbound firewall and Control Center
807TCPbox 

SPoE (Single Point of Entry firewall)
and
qstatd

inbound firewall and Control Center
808TCP/UDPbox event (Event Viewer)inbound firewall and Control Center (Barracuda Firewall Admin UI)
808TCP/UDPservice

event

inbound firewall and Control Center
809TCPbox

boxconfig (Configuration Service)

inbound firewall and Control Center
810TCPservice

masterconfig (Master Configuration Service)

inbound Control Center
811TCPservice

Master event

inbound Control Center
814TCPservice

vpnserver (VPN Service, Master VPN Service)

inbound firewall and Control Center
815TCPservice

mailgw (Mail Gateway Service)

inbound firewall and Control Center
816TCPservice

DHCP

inbound firewall and Control Center
817UDPservicetrans7inbound firewall and Control Center
818TCPservicePKIinbound Control Center
844TCPservice

policyserver (Policy Service, Master Policy Service)

inbound firewall and Control Center
845TCPbox

distd

inbound and outbound firewall and Control Center
850TCPserviceVirus Scanning serviceinbound firewall
880TCPservice

HTTP Proxy

inbound firewall and Control Center
889TCPserviceBarracuda Secure Connectorinbound and outbound Control Center
8443TCP (HTTPS)serviceREST APIinbound firewall and Control Center

44000 and 44001

TCPservice

policyserver

inbound firewall and Control Center
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