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Finish move of 'Limit' documentation to the Actions Article; Correct Macro doc

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@9454 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep 2009-02-19 15:36:19 +00:00
parent 5bac721af2
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3 changed files with 13 additions and 149 deletions
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4
docs/Documentation_Index.xml
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@ -18,7 +18,7 @@
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
<copyright>
<year>2001-2008</year>
<year>2001-2009</year>
<holder>Thomas M. Eastep</holder>
</copyright>
@ -57,7 +57,7 @@
<row>
<entry><ulink url="6to4.htm">6to4 Tunnels</ulink></entry>
<entry><ulink url="PortKnocking.html#Limit">Limiting per-IPaddress
<entry><ulink url="Actions.html#Limit">Limiting per-IPaddress
Connection Rate</ulink></entry>
<entry><ulink url="CompiledPrograms.html#Lite">Shorewall

13
docs/Macros.xml
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@ -133,11 +133,11 @@ ACCEPT loc fw udp 1024: 137
ACCEPT loc fw tcp 135,139,445</programlisting>
</blockquote>
<para><emphasis role="bold">Shorewall versions 4.2.0 and later:</emphasis>
When invoking a parameterized macro, you follow the name of the macro with
the action that you want to substitute for PARAM enclosed in parentheses.
The older syntax described above is still supported but is
deprecated.</para>
<para><emphasis role="bold">Shorewall-perl versions 4.2.0 and
later:</emphasis> When invoking a parameterized macro, you follow the name
of the macro with the action that you want to substitute for PARAM
enclosed in parentheses. The older syntax described above is still
supported but is deprecated.</para>
<para>Example:</para>
@ -308,7 +308,8 @@ ACCEPT fw loc tcp 135,139,445</programlisting>
'Drop' macros that are equivalent to the 'Reject' and 'Drop'
actions.</para>
<para>Default Macros are not supported by Shorewall-perl.</para>
<para><emphasis>Default Macros are not supported by
Shorewall-perl.</emphasis></para>
</section>
<section id="Defining">

145
docs/PortKnocking.xml
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@ -22,6 +22,8 @@
<year>2006</year>
<year>2009</year>
<holder>Thomas M. Eastep</holder>
</copyright>
@ -173,146 +175,7 @@ SSHKnock net loc:192.168.1.5 tcp 22 -
<section id="Limit">
<title>Limiting Per-IP Connection Rate</title>
<important>
<para>Debian users. This feature is broken in the Debian version 3.0.7
of Shorewall (and possibly in other versions). The file
<filename>/usr/share/shorewall/Limit</filename> was inadvertently
dropped from the .deb. That file may be obtained from <ulink
url="http://shorewall.svn.sourceforge.net/viewvc/*checkout*/shorewall/tags/3.0.7/Shorewall/Limit?revision=3888">Shorewall
SVN</ulink> and installed manually.</para>
</important>
<para>Beginning with Shorewall 3.0.4, Shorewall has a 'Limit' <ulink
url="Actions.html">action</ulink>. Limit is invoked with a comma-separated
list in place of a logging tag. The list has three elements:</para>
<orderedlist>
<listitem>
<para>The name of a 'recent' set; you select the set name which must
conform to the rules for a valid chain name. Different rules that
specify the same set name will use the same set of counters.</para>
</listitem>
<listitem>
<para>The number of connections permitted in a specified time
period.</para>
</listitem>
<listitem>
<para>The time period, expressed in seconds.</para>
</listitem>
</orderedlist>
<para>Connections that exceed the specified rate are dropped.</para>
<para>For example,to use a recent set name of <emphasis
role="bold">SSHA</emphasis>, and to limiting SSH to 3 per minute, use this
entry in <filename>/etc/shorewall/rules</filename>:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
Limit:none:SSHA,3,60 net $FW tcp 22</programlisting>
<para>If you want dropped connections to be logged at the info level, use
this rule instead:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
Limit:info:SSHA,3,60 net $FW tcp 22</programlisting>
<para>To summarize, you pass four pieces of information to the Limit
action:</para>
<itemizedlist>
<listitem>
<para>The log level. If you don't want to log, specify "none".</para>
</listitem>
<listitem>
<para>The name of the recent set that you want to use ("SSHA" in this
example).</para>
</listitem>
<listitem>
<para>The maximum number of connections to accept (3 in this
example).</para>
</listitem>
<listitem>
<para>The number of seconds over which you are willing to accept that
many connections (60 in this example).</para>
</listitem>
</itemizedlist>
<section id="LimitImp">
<title>How Limit is Implemented</title>
<para>For those who are curious, the Limit action is implemented in
Shorewall 3.0 and Shorewall 3.2 as follows:</para>
<itemizedlist>
<listitem>
<para>The file
<filename>/usr/share/shorewall/action</filename>.Limit is
empty.</para>
</listitem>
<listitem>
<para>The file <filename>/usr/share/shorewall/Limit</filename> is as
follows:</para>
<programlisting>set -- $(separate_list $TAG)
[ $# -eq 3 ] || fatal_error "Rule must include &lt;set name&gt;,&lt;max connections&gt;,&lt;interval&gt; as the log tag"
run_iptables -A $CHAIN -m recent --name $1 --set
if [ -n "$LEVEL" ]; then
run_iptables -N $CHAIN%
log_rule_limit $LEVEL $CHAIN% $1 DROP "" "" -A
run_iptables -A $CHAIN% -j DROP
run_iptables -A $CHAIN -m recent --name $1 --update --seconds $3 --hitcount $(( $2 + 1 )) -j $CHAIN%
else
run_iptables -A $CHAIN -m recent --update --name $1 --seconds $3 --hitcount $(( $2 + 1 )) -j DROP
fi
run_iptables -A $CHAIN -j ACCEPT</programlisting>
</listitem>
</itemizedlist>
<para>In Shorewall 3.3, Limit is made into a built-in action; basically
that means that the above code now lives inside of Shorewall rather than
in a separate file.</para>
<para>For completeness, here's the above
<filename>/usr/share/shorewall/Limit</filename> for use with
Shorewall-perl:</para>
<programlisting>my @tag = split /,/, $tag;
fatal_error 'Limit rules must include &lt;set name&gt;,&lt;max connections&gt;,&lt;interval&gt; as the log tag (' . join( ':', 'Limit', $level eq '' ? 'none' : $level , $tag ) . ')'
unless @tag == 3;
my $set = $tag[0];
for ( @tag[1,2] ) {
fatal_error 'Max connections and interval in Limit rules must be numeric (' . join( ':', 'Limit', $level eq '' ? 'none' : $level, $tag ) . ')' unless /^\d+$/
}
my $count = $tag[1] + 1;
add_rule $chainref, "-m recent --name $set --set";
if ( $level ) {
my $xchainref = new_chain 'filter' , "$chainref-&gt;{name}%";
log_rule_limit $level, $xchainref, $tag[0], 'DROP', '', '', 'add', '';
add_rule $xchainref, '-j DROP';
add_rule $chainref, "-m recent --name $set --update --seconds $tag[2] --hitcount $count -j $xchainref-&gt;{name}";
} else {
add_rule $chainref, "-m recent --update --name $set --seconds $tag[2] --hitcount $count -j DROP";
}
add_rule $chainref, '-j ACCEPT';
1; </programlisting>
</section>
<para>This information has been moved to the<ulink
url="Actions.html#Limit"> Actions article</ulink>.</para>
</section>
</article>