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shorewall_code/Shorewall/manpages/shorewall-blacklist.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<refentry>
<refmeta>
<refentrytitle>shorewall-blacklist</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>blacklist</refname>
<refpurpose>Shorewall Blacklist file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>/etc/shorewall/blacklist</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The blacklist file is used to perform static blacklisting by source
address (IP or MAC), or by application. The use of this file is deprecated
and beginning with Shorewall 4.5.7, the file is no longer
installed.</para>
<para>The columns in the file are as follows (where the column name is
followed by a different name in parentheses, the different name is used in
the alternate specification syntax).</para>
<variablelist>
<varlistentry>
<term><emphasis role="bold">ADDRESS/SUBNET</emphasis> (networks) -
{<emphasis role="bold">-</emphasis>|<emphasis
role="bold">~</emphasis><emphasis>mac-address</emphasis>|<emphasis>ip-address</emphasis>|<emphasis>address-range</emphasis>|<emphasis
role="bold">+</emphasis><emphasis>ipset</emphasis>}</term>
<listitem>
<para>Host address, network address, MAC address, IP address range
(if your kernel and iptables contain iprange match support) or ipset
name prefaced by "+" (if your kernel supports ipset match).
Exclusion (<ulink
url="shorewall-exclusion.html">shorewall-exclusion</ulink>(5)) is
supported.</para>
<para>MAC addresses must be prefixed with "~" and use "-" as a
separator.</para>
<para>Example: ~00-A0-C9-15-39-78</para>
<para>A dash ("-") in this column means that any source address will
match. This is useful if you want to blacklist a particular
application using entries in the PROTOCOL and PORTS columns.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">PROTOCOL</emphasis> (proto) - {<emphasis
role="bold">-</emphasis>|[!]<emphasis>protocol-number</emphasis>|[!]<emphasis>protocol-name</emphasis>}</term>
<listitem>
<para>Optional - If specified, must be a protocol number or a
protocol name from protocols(5).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">PORTS</emphasis> - {<emphasis
role="bold">-</emphasis>|[!]<emphasis>port-name-or-number</emphasis>[,<emphasis>port-name-or-number</emphasis>]...}</term>
<listitem>
<para>Optional - may only be specified if the protocol is TCP (6) or
UDP (17). A comma-separated list of destination port numbers or
service names from services(5).</para>
</listitem>
</varlistentry>
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<varlistentry>
<term>OPTIONS - {-|{dst|src|whitelist|audit}[,...]}</term>
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<listitem>
<para>Optional - added in 4.4.12. If specified, indicates whether
traffic <emphasis>from</emphasis> ADDRESS/SUBNET (<emphasis
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role="bold">src</emphasis>) or traffic <emphasis>to</emphasis>
ADDRESS/SUBNET (<emphasis role="bold">dst</emphasis>) should be
blacklisted. The default is <emphasis role="bold">src</emphasis>. If
the ADDRESS/SUBNET column is empty, then this column has no effect
on the generated rule.</para>
<note>
<para>In Shorewall 4.4.12, the keywords from and to were used in
place of src and dst respectively. Blacklisting was still
restricted to traffic <emphasis>arriving</emphasis> on an
interface that has the 'blacklist' option set. So to block traffic
from your local network to an internet host, you had to specify
<option>blacklist</option> on your internal interface in <ulink
url="shorewall-interfaces.html">shorewall-interfaces</ulink>
(5).</para>
</note>
<note>
<para>Beginning with Shorewall 4.4.13, entries are applied based
on the <emphasis role="bold">blacklist</emphasis> setting in
<ulink
url="shorewall-zones.html">shorewall-zones</ulink>(5):</para>
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<orderedlist>
<listitem>
<para>'blacklist' in the OPTIONS or IN_OPTIONS column. Traffic
from this zone is passed against the entries in this file that
have the <emphasis role="bold">src</emphasis> option
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(specified or defaulted).</para>
</listitem>
<listitem>
<para>'blacklist' in the OPTIONS or OUT_OPTIONS column.
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Traffic to this zone is passed against the entries in this
file that have the <emphasis role="bold">dst</emphasis>
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option.</para>
</listitem>
</orderedlist>
</note>
<para>In Shorewall 4.4.20, the <emphasis
role="bold">whitelist</emphasis> option was added. When <emphasis
role="bold">whitelist</emphasis> is specified, packets/connections
that match the entry are not matched against the remaining entries
in the file.</para>
<para>The <emphasis role="bold">audit</emphasis> option was also
added in 4.4.20 and causes packets matching the entry to be audited.
The <emphasis role="bold">audit</emphasis> option may not be
specified in whitelist entries and require AUDIT_TARGET support in
the kernel and iptables.</para>
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</listitem>
</varlistentry>
</variablelist>
<para></para>
</refsect1>
<refsect1>
<title>Example</title>
<variablelist>
<varlistentry>
<term>Example 1:</term>
<listitem>
<para>To block DNS queries from address 192.0.2.126:</para>
<programlisting> #ADDRESS/SUBNET PROTOCOL PORT
192.0.2.126 udp 53</programlisting>
</listitem>
</varlistentry>
<varlistentry>
<term>Example 2:</term>
<listitem>
<para>To block some of the nuisance applications:</para>
<programlisting> #ADDRESS/SUBNET PROTOCOL PORT
- udp 1024:1033,1434
- tcp 57,1433,1434,2401,2745,3127,3306,3410,4899,5554,6101,8081,9898</programlisting>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>FILES</title>
<para>/etc/shorewall/blacklist</para>
</refsect1>
<refsect1>
<title>See ALSO</title>
<para><ulink
url="http://shorewall.net/blacklisting_support.htm">http://shorewall.net/blacklisting_support.htm</ulink></para>
<para><ulink
url="http://shorewall.net/configuration_file_basics.htm#Pairs">http://shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>
<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
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shorewall-hosts(5), shorewall_interfaces(5), shorewall-ipsets(5),
shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5),
shorewall-netmap(5), shorewall-params(5), shorewall-policy(5),
shorewall-providers(5), shorewall-proxyarp(5), shorewall-rtrules(5),
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shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5),
shorewall-zones(5)</para>
</refsect1>
</refentry>