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Update Events.xml with stateful knocking example/description

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2014-07-01 06:43:20 -07:00
parent 2701b0a756
commit 7082bf1971
1 changed files with 82 additions and 0 deletions
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docs/Events.xml
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@ -701,5 +701,87 @@ ResetEvent(SSH,DROP:info) </programlisting>
# PORT(S)
Knock net $FW tcp 22,1599-1601 </programlisting>
</section>
<section id="Stateful">
<title>Stateful Port Knocking (knock with a sequence of ports)</title>
<para>Gerhard Wiesinger has contributed a Perl module that allows you to
define portknocking sequences. Download <ulink
url="pub/shorewall/contrib/PortKnocking/KnockEnhanced.pm">the
module</ulink> and copy it into your site_perl directory.</para>
<para>Using Gerhard's module, a port-knocking rule is defined via a
'?PERL' statement. This example opens the SSH port from net-&gt;fw using
the knock sequence 52245, 15623, 19845:</para>
<programlisting>?BEGIN PERL
use KnockEnhanced;
KnockEnhanced 'net', '$FW', {name =&gt; 'SSH1', log_level =&gt; 3, proto =&gt; 'tcp', target =&gt; 'ssh', knocker =&gt; [52245,15623,19845]};
?END PERL</programlisting>
<para>A few notes on the parameters:</para>
<itemizedlist>
<listitem>
<para>The first parameter is the rule SOURCE</para>
</listitem>
<listitem>
<para>The second parameter is the rule DEST</para>
</listitem>
<listitem>
<para>The third parameter is a Perl hash reference that defines the
remaining parameters. Each parameter is specified via
<replaceable>param</replaceable> =&gt;
<replaceable>value</replaceable>.</para>
<itemizedlist>
<listitem>
<para><emphasis role="bold">proto</emphasis> is the protocol --
if not specified, the default is tcp</para>
</listitem>
<listitem>
<para><emphasis role="bold">seconds</emphasis> is the timeout
between successive events -- default is 60 seconds.</para>
</listitem>
<listitem>
<para><emphasis role="bold">original_dest</emphasis> is the rule
ORIGINAL DEST</para>
</listitem>
<listitem>
<para><emphasis role="bold">target</emphasis> is the port(s)
that you are trying to open. May either be a single name or
number, or it may be a list of names and/or numbers separated by
commas and enclosed in square brackets ("[...]").</para>
</listitem>
<listitem>
<para><emphasis role="bold">name</emphasis> is a name used as
the base for event and chain names. If not supplied, the first
<emphasis role="bold">target</emphasis> is used, in which case
the first target must be a port name.</para>
</listitem>
<listitem>
<para><emphasis role="bold">log_level </emphasis>specifies
logging for the generated rules</para>
</listitem>
</itemizedlist>
<note>
<para>Port names and numbers may be optionally followed by a colon
(":") and a protocol name or number to override the specified
protocol.</para>
</note>
</listitem>
</itemizedlist>
<para>The module itself contains additional examples of its
usage.</para>
</section>
</section>
</article>