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Arrange for HELPER to match in the RELATED section.
Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep
parent
44a550870c
commit
fdc45a990d
@ -1823,7 +1823,7 @@ sub process_rule1 ( $$$$$$$$$$$$$$$$$$ ) {
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if ( $blacklist ) {
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$action = 'RETURN';
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} elsif ( $helper ne '-' ) {
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$actiontype |= HELPER;
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$actiontype |= HELPER if $section eq 'NEW';
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}
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} ,
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@ -2029,6 +2029,18 @@ sub process_rule1 ( $$$$$$$$$$$$$$$$$$ ) {
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do_headers( $headers ) ,
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do_condition( $condition ) ,
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);
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} elsif ( $section eq 'RELATED' ) {
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$rule = join( '',
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do_proto($proto, $ports, $sports),
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do_ratelimit( $ratelimit, $basictarget ) ,
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do_user( $user ) ,
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do_test( $mark , $globals{TC_MASK} ) ,
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do_connlimit( $connlimit ),
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do_time( $time ) ,
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do_headers( $headers ) ,
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do_condition( $condition ) ,
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do_helper( $helper ) ,
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);
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} else {
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$rule = join( '',
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do_proto($proto, $ports, $sports),
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@ -1369,11 +1369,18 @@
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<term><emphasis role="bold">HELPER</emphasis> - [helper]</term>
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<listitem>
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<para>Added in Shorewall 4.5.7. Causes the named conntrack
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<para>Added in Shorewall 4.5.7.</para>
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<para>In the NEW section, causes the named conntrack
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<replaceable>helper</replaceable> to be associated with this
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connection. The contents of this column are ignored unless ACTION is
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ACCEPT*, DNAT* or REDIRECT*. The <replaceable>helper</replaceable>
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may be one of:</para>
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connection; the contents of this column are ignored unless ACTION is
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ACCEPT*, DNAT* or REDIRECT*.</para>
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<para>In the RELATED section, will only match if the related
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connection has the named <replaceable>helper</replaceable>
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associated with it.</para>
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<para>The <replaceable>helper</replaceable> may be one of:</para>
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<simplelist>
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<member><option>amanda</option></member>
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@ -1207,11 +1207,18 @@
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<term><emphasis role="bold">HELPER</emphasis> - [helper]</term>
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<listitem>
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<para>Added in Shorewall 4.5.7. Causes the named conntrack
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<para>Added in Shorewall 4.5.7.</para>
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<para>In the NEW section, causes the named conntrack
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<replaceable>helper</replaceable> to be associated with this
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connection. The contents of this column are ignored unless ACTION is
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ACCEPT*, DNAT* or REDIRECT*. The <replaceable>helper</replaceable>
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may be one of:</para>
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connection; the contents of this column are ignored unless ACTION is
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ACCEPT*, DNAT* or REDIRECT*.</para>
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<para>In the RELATED section, will only match if the related
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connection has the named <replaceable>helper</replaceable>
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associated with it.</para>
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<para>The <replaceable>helper</replaceable> may be one of:</para>
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<simplelist>
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<member><option>amanda</option></member>
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@ -1238,8 +1245,8 @@
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</simplelist>
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<para>If the HELPERS option is specified in <ulink
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url="shorewall.conf.html">shorewall6.conf</ulink>(5), then any
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module specified in this column most be listed in the HELPERS
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url="shorewall.conf.html">shorewall.conf</ulink>(5), then any module
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specified in this column most be listed in the HELPERS
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setting.</para>
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</listitem>
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</varlistentry>
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@ -388,10 +388,18 @@
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iptables; see the table above.</para>
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<para>Beginning with Shorewall 4.5.7, there is a HELPER column in <ulink
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url="manpages/shorewall-rules.html">shorewall-rules</ulink> (5). This
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column allows the explicit association of a helper with connections
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allowed by a given rules. The column may contain any of the helper names
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recognized by iptables (see the table above).</para>
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url="manpages/shorewall-rules.html">shorewall-rules</ulink> (5). In the
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NEW section, this column allows the explicit association of a helper
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with connections allowed by a given rules. The column may contain any of
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the helper names recognized by iptables (see the table above). In the
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RELATED section, the rule will only match the packet if the related
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connection has the named helper attached.</para>
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<para>Also added in Shorewall 4.5.7 is the HELPER action in <ulink
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url="manpages/shorewall-rules.html">shorewall-rules</ulink> (5). HELPER
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rules associate the helper listed in the HELPER column with connections
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that match the rule. A destination zone should not be specified in
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HELPER rules.</para>
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</section>
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<section>
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@ -447,4 +455,42 @@ loadmodule nf_conntrack_sane ports=0</programlisting>
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module name.</para>
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</section>
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</section>
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<section>
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<title>Kernel >= 3.5 and Shorewall >= 4.5.7</title>
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<para>While the AUTOHELPER option described above provides for seamless
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migration to kernel 3.5 and beyond, we recommend setting AUTOHELPER=No at
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the first opportunity after migrating. Additionally, you should:</para>
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<itemizedlist>
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<listitem>
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<para>Use the HELPER action and the HELPER column in <ulink
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url="manpages/shorewall-rules.html">shorewall-rules</ulink> (5) to
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attach helpers to only those connections that you need to
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support.</para>
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</listitem>
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<listitem>
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<para>If you run one or more servers (such as an FTP server) that
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interact with helpers, you should consider adding rules to the RELATED
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section of <ulink
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url="manpages/shorewall-rules.html">shorewall-rules</ulink> (5) to
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limit the scope of the helper. Suppose that your Linux FTP server is
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in zone dmz and has address 70.90.191.123.</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST SOURCE
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# PORT(S) PORT(2)
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SECTION RELATED
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ACCEPT all dmz:70.90.191.123 32768: ; helper=ftp # passive FTP to dmz server; /proc/sys/net/ipv4/ip_local_port_range == 32760:65535
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ACCEPT dmz:70.90.191.123 all tcp 1024: 20 ; helper=ftp # active FTP to dmz server
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ACCEPT loc,dmz,$FW net tcp - 1024: ; helper=ftp # passive FTP to net
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ACCEPT net all tcp 1024: 20 ; helper=ftp # active FTP from net
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DROP:info all all ; helper=ftp #
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SECTION NEW
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HELPER all net tcp 21 ; helper=ftp
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ACCEPT all dmz:70.90.191.123 tcp 21 ; helper=ftp</programlisting>
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</listitem>
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</itemizedlist>
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</section>
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</article>
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