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Special Forums Cybersecurity FreeBSD IPFW Rules clarification please... Post 70414 by DanUK on Thursday 28th of April 2005 01:51:54 PM
Old 04-28-2005
FreeBSD IPFW Rules clarification please...

Hello.

I hope you can help me please.
We are about to bring a few servers online which will be hosting different things...

For one server, it will be hosting a HTTPd, and just wanted to know whether these rules are correct that I have?

To ensure the right interfaces etc, here's a copy of my 'ifconfig' output:

Code:
$ ifconfig
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=b<RXCSUM,TXCSUM,VLAN_MTU>
        inet our.public.ip.here netmask 0xfffffff0 broadcast our.broadcast.i[
        inet6 xxxxx prefixlen 64 scopeid 0x1
        ether 00:02:b3:b8:cd:7b
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
fwe0: flags=108802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
        options=8<VLAN_MTU>
        ether 02:0f:ea:1b:34:bf
        ch 1 dma -1
rl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
        options=8<VLAN_MTU>
        ether 00:0f:ea:a1:33:1b
        media: Ethernet autoselect (10baseT/UTP)
        status: no carrier
plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
$

The interface our public Internet Ethernet card is on is: fxp0

The rules:

Code:
# Define the firewall command (as in /etc/rc.firewall) for easy
# reference.  Helps to make it easier to read.
fwcmd="/sbin/ipfw"

# Force a flushing of the current rules before we reload.
$fwcmd -f flush

# Allow all connections that have dynamic rules built for them,
# but deny established connections that don't have a dynamic rule.
# See ipfw(8) for details.
$fwcmd add check-state
$fwcmd add deny tcp from any to any established

# Allow all localhost connections
$fwcmd add allow tcp from me to any out via lo0 setup keep-state
$fwcmd add deny  tcp from me to any out via lo0
$fwcmd add allow ip  from me to any out via lo0 keep-state

# Allow all connections from my network card that I initiate
$fwcmd add allow tcp from me to any out xmit any setup keep-state
$fwcmd add deny  tcp from me to any
$fwcmd add allow ip from me to any out xmit any keep-state
$fwcmd add allow all from 192.168.0.0/24 to any

# Everyone on the Internet is allowed to connect to the following
# services on the machine.  This example specifically allows connections
# to sshd and a webserver.
$fwcmd add allow tcp from any to any established
$fwcmd add allow tcp from any to me 80 setup

# This sends a RESET to all ident packets.
$fwcmd add reset log tcp from any to me 113 in recv any

# Enable ICMP: remove type 8 if you don't want your host to be pingable
$fwcmd add allow icmp from any to any icmptypes 0,3,11,12,13,14

# Deny all the rest.
$fwcmd add deny log ip from any to any

Many thanks!
 

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ftpservers(4)							   File Formats 						     ftpservers(4)

NAME
ftpservers - FTP Server virtual hosting configuration file SYNOPSIS
/etc/ftpd/ftpservers DESCRIPTION
The ftpservers file is used to configure complete virtual hosting. In contrast to limited virtual hosting, complete virtual hosting allows separate configuration files to be specified for each virtual host. The set of configuration files for each virtual host are placed in their own directory. The ftpservers file associates the address of each virtual host with the directory its configuration files are stored in. The virtual host configuration files must be named: ftpaccess Virtual host's access file ftpusers Restricts the accounts that can use the virtual host ftpgroups Virtual hosts enhanced group access file ftphosts Allow or deny usernames access to the virtual host ftpconversions Customize conversions available from the virtual host You do not need to put every file in each virtual host directory. If you want a virtual host to use the master copy of a file, then do not include it in the virtual host directory. If the file is not included, the master copy from the /etc/ftpd directory will be used. The file names must match exactly. If you misspell any of them or name them differently, the server will not find them, and the server will use the master copy instead. The ftpaddhost utility is an administrative tool to configure virtual hosts. See ftpaddhost(1M). File Format There are two fields to each entry in the ftpservers file: address directory-containing-configuration-files For example: 10.196.145.10 /etc/ftpd/virtual-ftpd/10.196.145.10 10.196.145.200 /etc/ftpd//virtual-ftpd/10.196.145.200 some.domain INTERNAL When an FTP client connects to the FTP Server, in.ftpd(1M) tries to match the IP address to which the FTP client connected with one found in the ftpservers file. The address can be an IPv4 or IPv6 address, or a hostname. If a match is found, The FTP server uses any configuration files found in the associated directory. If a match is not found, or an invalid directory path is encountered, the default paths to the configuration files are used. The use of INTERNAL in the example above fails the check for a specific directory, and the master configuration files will be used. Either the actual IP address or a specific hostname can be used to specify the virtual host. It is better to specify the actual IP of the virtual host, as it reduces the need for a domain lookup and eliminates DNS security related naming issues, for example: 10.196.145.20 /etc/ftpd/config/faqs.org/ ftp.some.domain /etc/ftpd/config/faqs.org/ Lines that begin with a # sign are treated as comment lines and are ignored. FILES
/etc/ftpd/ftpservers ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWftpr | +-----------------------------+-----------------------------+ |Interface Stability |External | +-----------------------------+-----------------------------+ SEE ALSO
ftpaddhost(1M), in.ftpd(1M), ftpaccess(4), ftpconversions(4), ftpgroups(4), ftphosts(4), ftpusers(4), attributes(5) SunOS 5.11 1 May 2003 ftpservers(4)
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