Provided by: nufw_2.4.3-3_amd64 
NAME
nufw - NUFW User filtering gateway server
SYNOPSIS
nufw [ -h ] [ -V ] [ -D ] [ -m ] [ -v[v...] ] [ -s ] [ -S ] [ -N ] [ -A debug_area ] [ -k keyfile ] [ -c
certfile ] [ -a cafile ] [ -r crlfile ] [ -n nuauth_cert_dn ] [ -d address ] [ -p (remote) port ] [ -t
timeout ] [ -T track_size ] [ -q NfQueue_num ] [ -L Nfqueue_length ] [ -C ] [ -M ]
DESCRIPTION
This manual page documents the nufw command.
nufw is the minimalist server, designed to run on the gateway(s) of the network. nufw is designed to run
in conjunction with nuauth, the authenticating server. nufw receives network packets from the local
firewall (on Linux 2.4 and 2.6, this is set up with the help of '-j NFQUEUE' or '-j QUEUE' netfilter
target), and synchronizes with a nuauth server to check packet is authorized to travel through the
gateway.
The design of the NUFW package lets administrator filter network traffic per user, not only per IP. This
means you can now deal with different permissions for user A and user B, even if they work at the same
moment, on the same multiuser machine. In other words, this extends firewalling criteria to userID, at
the network scale.
Original packaging and informations and help can be found from http://www.nufw.org/
OPTIONS
-h Issues usage details and exits.
-V Issues version and exits.
-D Run as a daemon. If started as a daemon, nufw logs message to syslog. If you don't specify this
option, messages go to the console nufw is running on, both on STDOUT and STDERR. Unless you are
debugging something, you should run nufw with this option.
-m Mark packets with UserID. This requires the wvmark POM patch applied to netfilter, and is
necessary for per user QoS or routing.
-v Increases debug level. Multiple switches are accepted and each of them increases the debug level
by one. Default debug level is 2, max is 10.
-A debug_areas
Chooses debug_area. Default debug area is ALL. To select a subset add value from the following
list:
• DEBUG_AREA_MAIN (1) main domain
• DEBUG_AREA_PACKET (2) packet domain
• DEBUG_AREA_USER (4) user domain
• DEBUG_AREA_GW (8) Gateway domain, interaction with nufw servers.
• DEBUG_AREA_AUTH (16) Authentication domain
-k keyfile
Use specified file as SSL (private) key file.
-c certfile
Use specified file as SSL (public) certificate file.
-a cafile
Use specified file as SSL certificate authority file.
-r crlfile
Use specified file as SSL certificate revocation list file. You will need to restart nufw if you
modify this file. Since 2.2.19, nufw reloads this file dynamically when receiving a HUP signal.
-n nuauth_dn
Use specified string as the needed DN of nuauth. nufw will refuse to connect if the provided
string does not match the DN of the certificate provided by nuauth. If you do not use this option,
the DN of the nuauth certificate will be checked against the fully qualified domain name of the
nuauth server, obtained from a reverse DNS lookup on nuauth IP address.
-s Disable strict TLS checking of the certificate provided by nuauth.
-S Force strict TLS checking of the certificate provided by nuauth. This is the default behavior of
the daemon since 2.2.18.
-N Suppress error if server FQDN does not match certificate CN.
-d address
Network address of the nuauth server.
-p port
Specifies TCP port to send data to when addressing the nuauth server. Nuauth server must be setup
to listen on that port. Default value : 4128
-t seconds
Specifies timeout to forget packets not answered for by nuauth. Default value : 15 s.
-T track_size
Set maximum number of packets that can wait a decision in nufw. Default value : 1000.
-q NfQueue number
If Nufw was compiled with NfQueue support, Id of the NfQueue to use (default : 0).
-L NfQueue length
Specify the length of the nfnetlink queue used by nufw. This is the number of packets that the
kernel will keep internally before dropping new coming packets.
-C Listen to conntrack events (needed for connection expiration).
-M Only report event on marked connections to nuauth (implies -C and -m)
This is the way to do an efficient selection of events to be sent to nuauth but this REQUIRES a
kernel with transmit_mark applied (should be ok for 2.6.18+) and the use of CONNMARK to propagate
the initial mark across all the packets of the connection.
SIGNALS
The nufw daemon is designed to deal with several signals : USR1, USR2, SYS, WINCH and POLL.
USR1 Increases verbosity. The daemon then acts as if it had been launched with one supplementary '-v'.A
line is also added to the system log to mention the signal event.
USR2 Decreases verbosity. The daemon then acts as if it had been launched with one less '-v'. A line is
also added to the system log to mention the signal event.
SYS Removes the Conntrack events thread. This gets the daemon to work as if the "-C" switch had not
been set. This is useful on HA configurations, when one firewall gets passive, for instance.
WINCH Starts the Conntrack events thread. This gets the daemon to work as if the "-C" switch had been
set at startup. This is useful on HA configurations, when one firewall gets active, for instance.
POLL Logs an "audit" line, mentionning how many network datagrams were received and sent since daemon
startup.
SEE ALSO
nuauth(8)
AUTHOR
Nufw was designed and coded by Eric Leblond, aka Regit (<eric@regit.org>) , and Vincent Deffontaines, aka gryzor (<vincent@gryzor.com>). Original idea in 2001, while working on NSM Ldap support. This manual page was written by Vincent Deffontaines Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 2 as published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. 25 November 2008 NUFW(8)