mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-15 12:14:32 +01:00
bfbcb081c5
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@1015 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
397 lines
18 KiB
HTML
397 lines
18 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html>
|
|
<head>
|
|
<meta content="HTML Tidy, see www.w3.org" name="generator">
|
|
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
|
|
<title>Shoreline Firewall (Shorewall) 1.4</title>
|
|
<base target="_self">
|
|
</head>
|
|
<body>
|
|
<div>
|
|
<table border="0" cellpadding="0" cellspacing="0" id="AutoNumber4"
|
|
style="border-collapse: collapse; width: 100%; height: 100%;">
|
|
<tbody>
|
|
<tr>
|
|
<td width="90%">
|
|
<h2>Introduction to Shorewall</h2>
|
|
<h3>This is the Shorewall 1.4 Web Site</h3>
|
|
The information on this site applies only to 1.4.x releases of
|
|
Shorewall. For older versions:<br>
|
|
<ul>
|
|
<li>The 1.3 site is <a href="http://www.shorewall.net/1.3"
|
|
target="_top">here.</a></li>
|
|
<li>The 1.2 site is <a href="http://shorewall.net/1.2/"
|
|
target="_top">here</a>.</li>
|
|
</ul>
|
|
<h3>Glossary</h3>
|
|
<ul>
|
|
<li><a href="http://www.netfilter.org">Netfilter</a> - the
|
|
packet filter facility built into the 2.4 and later Linux kernels.</li>
|
|
<li>ipchains - the packet filter facility built into the 2.2
|
|
Linux kernels. Also the name of the utility program used to configure
|
|
and control that facility. Netfilter can be used in ipchains
|
|
compatibility mode.</li>
|
|
<li>iptables - the utility program used to configure and
|
|
control Netfilter. The term 'iptables' is often used to refer to the
|
|
combination of iptables+Netfilter (with Netfilter not in ipchains
|
|
compatibility mode).</li>
|
|
</ul>
|
|
<h3>What is Shorewall?</h3>
|
|
The Shoreline Firewall, more commonly known as "Shorewall", is
|
|
high-level tool for configuring Netfilter. You describe your
|
|
firewall/gateway requirements using entries in a set of configuration
|
|
files. Shorewall reads those configuration files and with the help of
|
|
the iptables utility, Shorewall configures Netfilter to match your
|
|
requirements. Shorewall can be used on a dedicated firewall system, a
|
|
multi-function gateway/router/server or on a standalone GNU/Linux
|
|
system. Shorewall does not use Netfilter's ipchains compatibility mode
|
|
and can thus take advantage of Netfilter's connection state tracking
|
|
capabilities.<br>
|
|
<br>
|
|
Shorewall is <span style="text-decoration: underline;">not</span> a
|
|
daemon. Once Shorewall has configured Netfilter, it's job is complete
|
|
although the <a href="starting_and_stopping_shorewall.htm">/sbin/shorewall
|
|
program can be used at any time to monitor the Netfilter firewall</a>.<br>
|
|
<h3>Getting Started with Shorewall</h3>
|
|
New to Shorewall? Start by selecting the <a
|
|
href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that most
|
|
closely match your environment and follow the step by step instructions.<br>
|
|
<h3>Looking for Information?</h3>
|
|
The <a href="shorewall_quickstart_guide.htm#Documentation">Documentation
|
|
Index</a> is a good place to start as is the Quick Search in the frame
|
|
above.
|
|
<h3>License</h3>
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of <a href="http://www.gnu.org/licenses/gpl.html">Version
|
|
2 of the GNU General Public License</a> as published by the Free
|
|
Software Foundation.<br>
|
|
<p>This program is distributed in the hope that it will be
|
|
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more detail.</p>
|
|
<p>You should have received a copy of the GNU General Public
|
|
License along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p>
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.2 or
|
|
any later version published by the Free Software Foundation; with no
|
|
Invariant Sections, with no Front-Cover, and with no Back-Cover Texts.
|
|
A copy of the license is included in the section entitled <a>"GNU Free
|
|
Documentation License"</a>.
|
|
<p>Copyright © 2001-2003 Thomas M. Eastep </p>
|
|
<h3>Running Shorewall on Mandrake with a two-interface setup?</h3>
|
|
If so, the documentation <b></b>on this site will not apply directly
|
|
to your setup. If you want to use the documentation that you find here,
|
|
you will want to consider uninstalling what you have and installing a
|
|
setup that matches the documentation on this site. See the <a
|
|
href="two-interface.htm">Two-interface QuickStart Guide</a> for
|
|
details.<br>
|
|
<h2>News</h2>
|
|
<p><b>12/28/2003 - www.shorewall.net/ftp.shorewall.net Back
|
|
On-line</b> <b><img alt="(New)" src="images/new10.gif"
|
|
style="border: 0px solid ; width: 28px; height: 12px;" title=""> <br>
|
|
</b></p>
|
|
<p>Our high-capacity server has been restored to service --
|
|
please let <a href="mailto:webmaster@shorewall.net">us</a> know if you
|
|
find any problems.<br>
|
|
</p>
|
|
<p><b>12/07/2003 - Shorewall 1.4.9 Beta 1</b><b> </b></p>
|
|
<div style="margin-left: 40px;"><a
|
|
href="http://shorewall.net/pub/shorewall/Beta">http://shorewall.net/pub/shorewall/Beta</a><br>
|
|
<a href="ftp://shorewall.net/pub/shorewall/Beta" target="_top">ftp://shorewall.net/pub/shorewall/Beta</a>
|
|
</div>
|
|
<p>Problems Corrected since version 1.4.8:</p>
|
|
<ol>
|
|
<li>There has been a low continuing level of confusion over the
|
|
terms "Source NAT" (SNAT) and "Static NAT". To avoid future confusion,
|
|
all instances of "Static NAT" have been replaced with "One-to-one NAT"
|
|
in the documentation and configuration files.</li>
|
|
<li>The description of NEWNOTSYN in shorewall.conf has been
|
|
reworded for clarity.</li>
|
|
<li>Wild-card rules (those involving "all" as SOURCE or DEST)
|
|
will no longer produce an error if they attempt to add a rule that
|
|
would override a NONE policy. The logic for expanding these wild-card
|
|
rules now simply skips those (SOURCE,DEST) pairs that have a NONE
|
|
policy.</li>
|
|
</ol>
|
|
<p>Migration Issues:<br>
|
|
None.<br>
|
|
<br>
|
|
New Features: </p>
|
|
<ol>
|
|
<li>To cut down on the number of "Why are these ports closed
|
|
rather than stealthed?" questions, the SMB-related rules in
|
|
/etc/shorewall/common.def have been changed from 'reject' to 'DROP'.</li>
|
|
<li>For easier identification, packets logged under the
|
|
'norfc1918' interface option are now logged out of chains named
|
|
'rfc1918'. Previously, such packets were logged under chains named
|
|
'logdrop'.</li>
|
|
<li>Distributors and developers seem to be regularly inventing
|
|
new naming conventions for kernel modules. To avoid the need to change
|
|
Shorewall code for each new convention, the MODULE_SUFFIX option has
|
|
been added to shorewall.conf. MODULE_SUFFIX may be set to the suffix
|
|
for module names in your particular distribution. If MODULE_SUFFIX is
|
|
not set in shorewall.conf, Shorewall will use the list "o gz ko o.gz".<br>
|
|
<br>
|
|
To see what suffix is used by your distribution:<br>
|
|
<br>
|
|
ls /lib/modules/$(uname -r)/kernel/net/ipv4/netfilter<br>
|
|
<br>
|
|
All of the files listed should have the same suffix (extension). Set
|
|
MODULE_SUFFIX to that suffix.<br>
|
|
<br>
|
|
Examples:<br>
|
|
<br>
|
|
If all files end in ".kzo" then set
|
|
MODULE_SUFFIX="kzo"<br>
|
|
If all files end in ".kz.o" then set
|
|
MODULE_SUFFIX="kz.o"</li>
|
|
<li>Support for user defined rule ACTIONS has been implemented
|
|
through two new files:<br>
|
|
<br>
|
|
/etc/shorewall/actions - used to list the user-defined ACTIONS.<br>
|
|
/etc/shorewall/action.template - For each user defined <action>,
|
|
copy this file to /etc/shorewall/action.<action> and add the
|
|
appropriate rules for that <action>. Once an <action> has
|
|
been defined, it may be used like any of the builtin ACTIONS (ACCEPT,
|
|
DROP, etc.) in /etc/shorewall/rules.<br>
|
|
<br>
|
|
Example: You want an action that logs a packet at the 'info' level and
|
|
accepts the connection.<br>
|
|
<br>
|
|
In /etc/shorewall/actions, you would add:<br>
|
|
<br>
|
|
LogAndAccept<br>
|
|
<br>
|
|
You would then copy /etc/shorewall/action.template to
|
|
/etc/shorewall/LogAndAccept and in that file, you would add the two
|
|
rules:<br>
|
|
LOG:info<br>
|
|
ACCEPT<br>
|
|
<br>
|
|
</li>
|
|
</ol>
|
|
<p><b>12/03/2003 - Support Torch Passed</b> <b><img alt="(New)"
|
|
src="images/new10.gif"
|
|
style="border: 0px solid ; width: 28px; height: 12px;" title=""></b></p>
|
|
Effective today, I am reducing my participation in the day-to-day
|
|
support of Shorewall. As part of this shift to community-based
|
|
Shorewall support a new <a
|
|
href="https://lists.shorewall.net/mailman/listinfo/shorewall-newbies">Shorewall
|
|
Newbies mailing list</a> has been established to field questions and
|
|
problems from new users. I will not monitor that list personally. I
|
|
will continue my active development of Shorewall and will be available
|
|
via the development list to handle development issues -- Tom.
|
|
<p><b>11/07/2003 - Shorewall 1.4.8</b><b><br>
|
|
<br>
|
|
</b> Problems Corrected since version 1.4.7:<br>
|
|
</p>
|
|
<ol>
|
|
<li>Tuomo Soini has supplied a correction to a problem that
|
|
occurs using some versions of 'ash'. The symptom is that "shorewall
|
|
start" fails with:<br>
|
|
<br>
|
|
local: --limit: bad variable name<br>
|
|
iptables v1.2.8: Couldn't load match
|
|
`-j':/lib/iptables/libipt_-j.so:<br>
|
|
cannot open shared object file: No such file or directory<br>
|
|
Try `iptables -h' or 'iptables --help' for more
|
|
information.</li>
|
|
<li>Andres Zhoglo has supplied a correction that avoids trying
|
|
to use the multiport match iptables facility on ICMP rules.<br>
|
|
<br>
|
|
Example of rule that previously caused "shorewall start"
|
|
to fail:<br>
|
|
<br>
|
|
|
|
ACCEPT loc $FW
|
|
icmp 0,8,11,12<br>
|
|
<br>
|
|
</li>
|
|
<li>Previously, if the following error message was issued,
|
|
Shorewall was left in an inconsistent state.<br>
|
|
<br>
|
|
Error: Unable to determine the routes through interface xxx<br>
|
|
<br>
|
|
</li>
|
|
<li>Handling of the LOGUNCLEAN option in shorewall.conf has
|
|
been corrected.</li>
|
|
<li>In Shorewall 1.4.2, an optimization was added. This
|
|
optimization involved creating a chain named "<zone>_frwd" for
|
|
most zones defined using the /etc/shorewall/hosts file. It has since
|
|
been discovered that in many cases these new chains contain redundant
|
|
rules and that the "optimization" turns out to be less than optimal.
|
|
The implementation has now been corrected.</li>
|
|
<li>When the MARK value in a tcrules entry is followed by ":F"
|
|
or ":P", the ":F" or ":P" was previously only applied to the first
|
|
Netfilter rule generated by the entry. It is now applied to all entries.</li>
|
|
<li>An incorrect comment concerning Debian's use of the
|
|
SUBSYSLOCK option has been removed from shorewall.conf.</li>
|
|
<li>Previously, neither the 'routefilter' interface option nor
|
|
the ROUTE_FILTER parameter were working properly. This has been
|
|
corrected (thanks to Eric Bowles for his analysis and patch). The
|
|
definition of the ROUTE_FILTER option has changed however. Previously,
|
|
ROUTE_FILTER=Yes was documented as enabling route filtering on all
|
|
interfaces (which didn't work). Beginning with this release, setting
|
|
ROUTE_FILTER=Yes will enable route filtering of all interfaces brought
|
|
up while Shorewall is started. As a consequence, ROUTE_FILTER=Yes can
|
|
coexist with the use of the 'routefilter' option in the interfaces file.</li>
|
|
<li>If MAC verification was enabled on an interface with a /32
|
|
address and a broadcast address then an error would occur during
|
|
startup.</li>
|
|
<li>he NONE policy's intended use is to suppress the generating
|
|
of rules that can't possibly be traversed. This means that a policy of
|
|
NONE is inappropriate where the source or destination zone is $FW or
|
|
"all". Shorewall now generates an error message if such a policy is
|
|
given in /etc/shorewall/policy. Previously such a policy caused
|
|
"shorewall start" to fail.</li>
|
|
<li>The 'routeback' option was broken for wildcard interfaces
|
|
(e.g., "tun+"). This has been corrected so that 'routeback' now works
|
|
as expected in this case.<br>
|
|
</li>
|
|
</ol>
|
|
Migration Issues:<br>
|
|
<ol>
|
|
<li>The definition of the ROUTE_FILTER option in shorewall.conf
|
|
has changed as described in item 8) above.<br>
|
|
</li>
|
|
</ol>
|
|
New Features:<br>
|
|
<ol>
|
|
<li>A new QUEUE action has been introduced for rules. QUEUE
|
|
allows you to pass connection requests to a user-space filter such as
|
|
ftwall (http://p2pwall.sourceforge.net). The ftwall program allows for
|
|
effective filtering of p2p applications such as Kazaa. For example, to
|
|
use ftwall to filter P2P clients in the 'loc' zone, you would add the
|
|
following rules:<br>
|
|
<br>
|
|
QUEUE loc
|
|
net tcp<br>
|
|
QUEUE loc
|
|
net udp<br>
|
|
QUEUE loc
|
|
fw udp<br>
|
|
<br>
|
|
You would normally want to place those three rules BEFORE any ACCEPT
|
|
rules for loc->net udp or tcp.<br>
|
|
<br>
|
|
Note: When the protocol specified is TCP ("tcp", "TCP" or "6"),
|
|
Shorewall will only pass connection requests (SYN packets) to user
|
|
space. This is for compatibility with ftwall.</li>
|
|
<li>A BLACKLISTNEWNONLY option has been added to
|
|
shorewall.conf. When this option is set to "Yes", the blacklists
|
|
(dynamic and static) are only consulted for new connection requests.
|
|
When set to "No" (the default if the variable is not set), the
|
|
blacklists are consulted on every packet.<br>
|
|
<br>
|
|
Setting this option to "No" allows blacklisting to stop existing
|
|
connections from a newly blacklisted host but is more expensive in
|
|
terms of packet processing time. This is especially true if the
|
|
blacklists contain a large number of entries.</li>
|
|
<li>Chain names used in the /etc/shorewall/accounting file may
|
|
now begin with a digit ([0-9]) and may contain embedded dashes ("-").</li>
|
|
</ol>
|
|
<p><b>10/26/2003 - Shorewall 1.4.7a and 1.4.7b win brown paper
|
|
bag awards</b> <b><img align="middle" alt="" src="images/j0233056.gif"
|
|
style="border: 0px solid ; width: 50px; height: 80px;" title="">Shorewall
|
|
1.4.7c released.</b></p>
|
|
<ol>
|
|
<li>The saga with "<zone>_frwd" chains continues. The
|
|
1.4.7c script produces a ruleset that should work for everyone even if
|
|
it is not quite optimal. My apologies for this ongoing mess.<br>
|
|
</li>
|
|
</ol>
|
|
<p><b>10/24/2003 - Shorewall 1.4.7b</b></p>
|
|
<p>This is a bugfx rollup of the 1.4.7a fixes plus:<br>
|
|
</p>
|
|
<ol>
|
|
<li>The fix for problem 5 in 1.4.7a was wrong with the result
|
|
that "<zone>_frwd" chains might contain too few rules. That wrong
|
|
code is corrected in this release.<br>
|
|
</li>
|
|
</ol>
|
|
<p><b>10/21/2003 - Shorewall 1.4.7a</b></p>
|
|
<p>This is a bugfix rollup of the following problem corrections:<br>
|
|
</p>
|
|
<ol>
|
|
<li>Tuomo Soini has supplied a correction to a problem that
|
|
occurs using some versions of 'ash'. The symptom is that "shorewall
|
|
start" fails with:<br>
|
|
<br>
|
|
local: --limit: bad variable name<br>
|
|
iptables v1.2.8: Couldn't load match
|
|
`-j':/lib/iptables/libipt_-j.so:<br>
|
|
cannot open shared object file: No such file or directory<br>
|
|
Try `iptables -h' or 'iptables --help' for more
|
|
information.<br>
|
|
<br>
|
|
</li>
|
|
<li>Andres Zhoglo has supplied a correction that avoids trying
|
|
to use the multiport match iptables facility on ICMP rules.<br>
|
|
<br>
|
|
Example of rule that previously caused "shorewall start"
|
|
to fail:<br>
|
|
<br>
|
|
|
|
ACCEPT loc $FW
|
|
icmp 0,8,11,12<br>
|
|
<br>
|
|
</li>
|
|
<li>Previously, if the following error message was issued,
|
|
Shorewall was left in an inconsistent state.<br>
|
|
<br>
|
|
Error: Unable to determine the routes through interface xxx<br>
|
|
<br>
|
|
</li>
|
|
<li>Handling of the LOGUNCLEAN option in shorewall.conf has
|
|
been corrected.</li>
|
|
<li>In Shorewall 1.4.2, an optimization was added. This
|
|
optimization involved creating a chain named "<zone>_frwd" for
|
|
most zones defined using the /etc/shorewall/hosts file. It has since
|
|
been discovered that in many cases these new chains contain redundant
|
|
rules and that the "optimization" turns out to be less than optimal.
|
|
The implementation has now been corrected.</li>
|
|
<li>When the MARK value in a tcrules entry is followed by ":F"
|
|
or ":P", the ":F" or ":P" was previously only applied to the first
|
|
Netfilter rule generated by the entry. It is now applied to all entries.<br>
|
|
</li>
|
|
</ol>
|
|
<p><a href="News.htm">More News</a></p>
|
|
<p><a href="http://leaf.sourceforge.net" target="_top"><img
|
|
alt="(Leaf Logo)" border="0" height="36" src="images/leaflogo.gif"
|
|
width="49"></a> Jacques Nilo and Eric Wolzak have a LEAF
|
|
(router/firewall/gateway on a floppy, CD or compact flash) distribution
|
|
called <i>Bering</i> that features Shorewall-1.4.2 and Kernel-2.4.20.
|
|
You can find their work at: <a
|
|
href="http://leaf.sourceforge.net/devel/jnilo">http://leaf.sourceforge.net/devel/jnilo<br>
|
|
</a></p>
|
|
<b>Congratulations to Jacques and Eric on the recent release of
|
|
Bering 1.2!!!<br>
|
|
<br>
|
|
</b>
|
|
<div style="text-align: center;"><a
|
|
href="http://www.shorewall.net" target="_top"><img
|
|
alt="(Protected by Shorewall)" src="images/ProtectedBy.png"
|
|
style="border: 0px solid ; width: 216px; height: 45px;" title=""></a></div>
|
|
<b> </b>
|
|
<div>
|
|
<div style="text-align: center;"> </div>
|
|
</div>
|
|
<h2><a name="Donations"></a>Donations</h2>
|
|
<p style="text-align: left;"><a href="http://www.starlight.org"><img
|
|
align="left" alt="(Starlight Logo)" hspace="10" src="images/newlog.gif"
|
|
style="border: 4px solid ; width: 57px; height: 100px;" title=""></a><br>
|
|
<big>Shorewall is free but if you try it and find it useful,
|
|
please consider making a donation to <a href="http://www.starlight.org">Starlight
|
|
Children's Foundation</a>. Thanks!</big><br>
|
|
<a href="http://www.starlight.org"></a></p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<p><font size="2">Updated 12/28/2003 - <a href="support.htm">Tom Eastep</a></font><br>
|
|
</p>
|
|
</body>
|
|
</html>
|