mirror of
https://gitlab.com/shorewall/code.git
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575 lines
23 KiB
XML
575 lines
23 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<refentry>
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<refmeta>
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<refentrytitle>shorewall6-conntrack</refentrytitle>
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<manvolnum>5</manvolnum>
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<refmiscinfo>Configuration Files</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>conntrack</refname>
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<refpurpose>shorewall conntrack file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/conntrack</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The original intent of the <emphasis role="bold">notrack</emphasis>
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file was to exempt certain traffic from Netfilter connection tracking.
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Traffic matching entries in the file were not to be tracked.</para>
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<para>The role of the file was expanded in Shorewall 4.4.27 to include all
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rules that can be added in the Netfilter <emphasis
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role="bold">raw</emphasis> table. In 4.5.7, the file's name was changed to
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<emphasis role="bold">conntrack</emphasis>.</para>
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<para>The file supports three different column layouts: FORMAT 1, FORMAT
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2, and FORMAT 3, FORMAT 1 being the default. The three differ as
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follows:</para>
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<itemizedlist>
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<listitem>
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<para>in FORMAT 2 and 3, there is an additional leading ACTION
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column.</para>
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</listitem>
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<listitem>
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<para>in FORMAT 3, the SOURCE column accepts no zone name; rather the
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ACTION column allows a SUFFIX that determines the chain(s) that the
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generated rule will be added to.</para>
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</listitem>
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</itemizedlist>
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<para>When an entry in the following form is encountered, the format of
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the following entries are assumed to be of the specified
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<replaceable>format</replaceable>.</para>
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<simplelist>
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<member><emphasis role="bold">[?]FORMAT</emphasis>
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<replaceable>format</replaceable></member>
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</simplelist>
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<para>where <replaceable>format</replaceable> is either <emphasis
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role="bold">1</emphasis>,<emphasis role="bold">2</emphasis> or <emphasis
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role="bold">3</emphasis>.</para>
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<para>Format 3 was introduced in Shorewall 4.5.10. The optional '?' was
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introduced in Shorewall 4.5.11 and ?FORMAT is the preferred form; the form
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without the '?' is deprecated.</para>
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<para>Comments may be attached to Netfilter rules generated from entries
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in this file through the use of COMMENT lines. These lines begin with the
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word COMMENT; the remainder of the line is treated as a comment which is
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attached to subsequent rules until another COMMENT line is found or until
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the end of the file is reached. To stop adding comments to rules, use a
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line with only the word COMMENT.</para>
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<note>
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<para>Beginning with Shorewall 4.5.11, ?COMMENT is a synonym for COMMENT
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and is preferred.</para>
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</note>
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<para>The columns in the file are as follows (where the column name is
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followed by a different name in parentheses, the different name is used in
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the alternate specification syntax).</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">ACTION</emphasis> - {<emphasis
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role="bold">NOTRACK</emphasis>|<emphasis
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role="bold">CT</emphasis>:<emphasis
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role="bold">helper</emphasis>:<replaceable>name</replaceable>[(<replaceable>arg</replaceable>=<replaceable>val</replaceable>[,...])|<emphasis
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role="bold">CT:ctevents:<replaceable>event</replaceable>[,...]|CT:expevents:new</emphasis><emphasis
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role="bold">|CT:notrack</emphasis>|DROP|LOG|ULOG(<replaceable>ulog-parameters</replaceable>):NFLOG(<replaceable>nflog-parameters</replaceable>)|IPTABLES(<replaceable>target</replaceable>)}[<replaceable>log-level</replaceable>[:<replaceable>log-tag</replaceable>]][:<replaceable>chain-designator</replaceable>]</term>
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<listitem>
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<para>This column is only present when FORMAT >= 2. Values other
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than NOTRACK or DROP require <firstterm>CT Target
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</firstterm>support in your iptables and kernel.</para>
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<itemizedlist>
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<listitem>
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<para><option>NOTRACK</option> or
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<option>CT:notrack</option></para>
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<para>Disables connection tracking for this packet. If a
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<replaceable>log-level</replaceable> is specified, the packet
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will also be logged at that level.</para>
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</listitem>
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<listitem>
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<para><option>CT:helper</option>:<replaceable>name</replaceable></para>
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<para>Attach the helper identified by the
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<replaceable>name</replaceable> to this connection. This is more
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flexible than loading the conntrack helper with preset ports. If
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a <replaceable>log-level</replaceable> is specified, the packet
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will also be logged at that level. Beginning with Shorewall
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4.6.10, the helper name is optional</para>
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<para>At this writing, the available helpers are:</para>
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<variablelist>
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<varlistentry>
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<term>amanda</term>
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<listitem>
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<para>Requires that the amanda netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>ftp</term>
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<listitem>
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<para>Requires that the FTP netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>irc</term>
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<listitem>
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<para>Requires that the IRC netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>netbios-ns</term>
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<listitem>
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<para>Requires that the netbios_ns (sic) helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>RAS and Q.931</term>
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<listitem>
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<para>These require that the H323 netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>pptp</term>
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<listitem>
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<para>Requires that the pptp netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>sane</term>
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<listitem>
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<para>Requires that the SANE netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>sip</term>
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<listitem>
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<para>Requires that the SIP netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>snmp</term>
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<listitem>
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<para>Requires that the SNMP netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>tftp</term>
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<listitem>
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<para>Requires that the TFTP netfilter helper is
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present.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>May be followed by an option list of
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<replaceable>arg</replaceable>=<replaceable>val</replaceable>
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pairs in parentheses:</para>
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<itemizedlist>
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<listitem>
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<para><option>ctevents</option>=<replaceable>event</replaceable>[,...]</para>
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<para>Only generate the specified conntrack events for this
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connection. Possible event types are: <emphasis
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role="bold">new</emphasis>, <emphasis
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role="bold">related</emphasis>, <emphasis
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role="bold">destroy</emphasis>, <emphasis
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role="bold">reply</emphasis>, <emphasis
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role="bold">assured</emphasis>, <emphasis
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role="bold">protoinfo</emphasis>, <emphasis
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role="bold">helper</emphasis>, <emphasis
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role="bold">mark</emphasis> (this is connection mark, not
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packet mark), <emphasis role="bold">natseqinfo</emphasis>,
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and <emphasis role="bold">secmark</emphasis>. If more than
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one <emphasis>event</emphasis> is listed, the
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<replaceable>event</replaceable> list must be enclosed in
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parentheses (e.g., ctevents=(new,related)).</para>
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</listitem>
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<listitem>
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<para><option>expevents</option><option>=new</option></para>
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<para>Only generate a <emphasis role="bold">new</emphasis>
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expectation events for this connection.</para>
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</listitem>
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</itemizedlist>
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</listitem>
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<listitem>
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<para>ctevents:<replaceable>event</replaceable>[,...]</para>
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<para>Added in Shorewall 4.6.10. Only generate the specified
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conntrack events for this connection. Possible event types are:
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<emphasis role="bold">new</emphasis>, <emphasis
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role="bold">related</emphasis>, <emphasis
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role="bold">destroy</emphasis>, <emphasis
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role="bold">reply</emphasis>, <emphasis
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role="bold">assured</emphasis>, <emphasis
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role="bold">protoinfo</emphasis>, <emphasis
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role="bold">helper</emphasis>, <emphasis
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role="bold">mark</emphasis> (this is connection mark, not packet
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mark), <emphasis role="bold">natseqinfo</emphasis>, and
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<emphasis role="bold">secmark</emphasis>.</para>
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</listitem>
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<listitem>
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<para>expevents=new</para>
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<para>Added in Shorewall 4.6.10. Only generate <emphasis
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role="bold">new</emphasis> expectation events for this
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connection.</para>
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</listitem>
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<listitem>
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<para><option>DROP</option></para>
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<para>Added in Shorewall 4.5.10. Silently discard the packet. If
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a <replaceable>log-level</replaceable> is specified, the packet
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will also be logged at that level.</para>
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</listitem>
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<listitem>
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<para><option>IPTABLES</option>(<replaceable>target</replaceable>)</para>
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<para>Added in Shorewall 4.6.0. Allows you to specify any
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iptables <replaceable>target</replaceable> with target options
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(e.g., "IPTABLES(AUDIT --type drop)"). If the target is not one
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recognized by Shorewall, the following error message will be
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issued:</para>
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<simplelist>
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<member>ERROR: Unknown target
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(<replaceable>target</replaceable>)</member>
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</simplelist>
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<para>This error message may be eliminated by adding
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<replaceable>target</replaceable> as a builtin action in <ulink
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url="/manpages/shorewall-actions.html">shorewall-actions</ulink>(5).</para>
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</listitem>
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<listitem>
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<para><option>LOG</option></para>
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<para>Added in Shoreawll 4.6.0. Logs the packet using the
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specified <replaceable>log-level</replaceable> and<replaceable>
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log-tag </replaceable>(if any). If no log-level is specified,
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then 'info' is assumed.</para>
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</listitem>
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<listitem>
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<para><option>NFLOG</option></para>
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<para>Added in Shoreawll 4.6.0. Queues the packet to a backend
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logging daemon using the NFLOG netfilter target with the
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specified <replaceable>nflog-parameters</replaceable>.</para>
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</listitem>
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<listitem>
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<para><option>ULOG</option></para>
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<para>Added in Shoreawll 4.6.0. Queues the packet to a backend
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logging daemon using the ULOG netfilter target with the
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specified <replaceable>ulog-parameters</replaceable>.</para>
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</listitem>
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</itemizedlist>
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<para>When FORMAT = 1, this column is not present and the rule is
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processed as if NOTRACK had been entered in this column.</para>
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<para>Beginning with Shorewall 4.5.10, when FORMAT = 3, this column
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can end with a colon followed by a
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<replaceable>chain-designator</replaceable>. The
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<replaceable>chain-designator</replaceable> can be one of the
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following:</para>
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<variablelist>
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<varlistentry>
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<term>P</term>
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<listitem>
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<para>The rule is added to the raw table PREROUTING chain.
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This is the default if no
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<replaceable>chain-designator</replaceable> is present.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>O</term>
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<listitem>
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<para>The rule is added to the raw table OUTPUT chain.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>PO or OP</term>
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<listitem>
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<para>The rule is added to the raw table PREROUTING and OUTPUT
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chains.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SOURCE (formats 1 and 2) ‒
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{<emphasis>zone</emphasis>[:<emphasis>interface</emphasis>][:<emphasis>address-list</emphasis>]}</term>
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<listitem>
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<para>where <replaceable>zone</replaceable> is the name of a zone,
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<replaceable>interface</replaceable> is an interface to that zone,
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and <replaceable>address-list</replaceable> is a comma-separated
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list of addresses (may contain exclusion - see <ulink
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url="/manpages/shorewall-exclusion.html">shorewall-exclusion</ulink>
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(5)).</para>
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<para>Beginning with Shorewall 4.5.7, <option>all</option> can be
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used as the <replaceable>zone</replaceable> name to mean
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<firstterm>all zones</firstterm>.</para>
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<para>Beginning with Shorewall 4.5.10, <option>all-</option> can be
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used as the <replaceable>zone</replaceable> name to mean all
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<firstterm>off-firewall zone</firstterm>s.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SOURCE (format 3) ‒
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{-|<emphasis>interface</emphasis>[:<emphasis>address-list</emphasis>]|<replaceable>address-list</replaceable>}</term>
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<listitem>
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<para>Where <replaceable>interface</replaceable> is an interface to
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that zone, and <replaceable>address-list</replaceable> is a
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comma-separated list of addresses (may contain exclusion - see
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<ulink
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url="/manpages/shorewall-exclusion.html">shorewall-exclusion</ulink>
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(5)).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>DEST ‒
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{-|<emphasis>interface</emphasis>[:<emphasis>address-list</emphasis>]|<replaceable>address-list</replaceable>}</term>
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|
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<listitem>
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<para>where <replaceable>address-list</replaceable> is a
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comma-separated list of addresses (may contain exclusion - see
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<ulink
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url="/manpages/shorewall-exclusion.html">shorewall-exclusion</ulink>
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(5)).</para>
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</listitem>
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||
</varlistentry>
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<varlistentry>
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<term>PROTO ‒
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<replaceable>protocol-name-or-number</replaceable>[,...]</term>
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|
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<listitem>
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||
<para>A protocol name from <filename>/etc/protocols</filename> or a
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||
protocol number.</para>
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||
|
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<para>Beginning with Shorewall 4.5.12, this column is labeled
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||
<emphasis role="bold">PROTOS</emphasis> and can accept a
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comma-separated list of protocols. Either <emphasis
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||
role="bold">proto</emphasis> or <emphasis
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role="bold">protos</emphasis> is accepted in the alternate input
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format.</para>
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||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
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||
<term>DEST PORT(S) (dport) - port-number/service-name-list</term>
|
||
|
||
<listitem>
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||
<para>A comma-separated list of port numbers and/or service names
|
||
from <filename>/etc/services</filename>. May also include port
|
||
ranges of the form
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||
<replaceable>low-port</replaceable>:<replaceable>high-port</replaceable>
|
||
if your kernel and iptables include port range support.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>SOURCE PORT(S) (sport) - port-number/service-name-list</term>
|
||
|
||
<listitem>
|
||
<para>A comma-separated list of port numbers and/or service names
|
||
from <filename>/etc/services</filename>. May also include port
|
||
ranges of the form
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<replaceable>low-port</replaceable>:<replaceable>high-port</replaceable>
|
||
if your kernel and iptables include port range support.</para>
|
||
|
||
<para>Beginning with Shorewall 4.5.15, you may place '=' in this
|
||
column, provided that the DEST PORT(S) column is non-empty. This
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||
causes the rule to match when either the source port or the
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||
destination port in a packet matches one of the ports specified in
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||
DEST PORTS(S). Use of '=' requires multi-port match in your iptables
|
||
and kernel.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>USER/GROUP (user) ‒
|
||
[<replaceable>user</replaceable>][:<replaceable>group</replaceable>]</term>
|
||
|
||
<listitem>
|
||
<para>May only be specified if the SOURCE
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||
<replaceable>zone</replaceable> is $FW. Specifies the effective user
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||
id and or group id of the process sending the traffic.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><emphasis role="bold">SWITCH -
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||
[!]<replaceable>switch-name</replaceable>[={0|1}]</emphasis></term>
|
||
|
||
<listitem>
|
||
<para>Added in Shorewall 4.5.10 and allows enabling and disabling
|
||
the rule without requiring <command>shorewall
|
||
restart</command>.</para>
|
||
|
||
<para>The rule is enabled if the value stored in
|
||
<filename>/proc/net/nf_condition/<replaceable>switch-name</replaceable></filename>
|
||
is 1. The rule is disabled if that file contains 0 (the default). If
|
||
'!' is supplied, the test is inverted such that the rule is enabled
|
||
if the file contains 0.</para>
|
||
|
||
<para>Within the <replaceable>switch-name</replaceable>, '@0' and
|
||
'@{0}' are replaced by the name of the chain to which the rule is a
|
||
added. The <replaceable>switch-name</replaceable> (after '...'
|
||
expansion) must begin with a letter and be composed of letters,
|
||
decimal digits, underscores or hyphens. Switch names must be 30
|
||
characters or less in length.</para>
|
||
|
||
<para>Switches are normally <emphasis role="bold">off</emphasis>. To
|
||
turn a switch <emphasis role="bold">on</emphasis>:</para>
|
||
|
||
<simplelist>
|
||
<member><command>echo 1 >
|
||
/proc/net/nf_condition/<replaceable>switch-name</replaceable></command></member>
|
||
</simplelist>
|
||
|
||
<para>To turn it <emphasis role="bold">off</emphasis> again:</para>
|
||
|
||
<simplelist>
|
||
<member><command>echo 0 >
|
||
/proc/net/nf_condition/<replaceable>switch-name</replaceable></command></member>
|
||
</simplelist>
|
||
|
||
<para>Switch settings are retained over <command>shorewall
|
||
restart</command>.</para>
|
||
|
||
<para>When the <replaceable>switch-name</replaceable> is followed by
|
||
<option>=0</option> or <option>=1</option>, then the switch is
|
||
initialized to off or on respectively by the
|
||
<command>start</command> command. Other commands do not affect the
|
||
switch setting.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>EXAMPLE</title>
|
||
|
||
<para>Example 1:</para>
|
||
|
||
<programlisting>#ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP
|
||
# PORT(S) PORT(S)
|
||
CT:helper:ftp(expevents=new) fw - tcp 21 </programlisting>
|
||
|
||
<para>Example 2 (Shorewall 4.5.10 or later):</para>
|
||
|
||
<para>Drop traffic to/from all zones to IP address 1.2.3.4</para>
|
||
|
||
<programlisting>FORMAT 2
|
||
#ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP
|
||
# PORT(S) PORT(S)
|
||
DROP all-:1.2.3.4 -
|
||
DROP all 1.2.3.4</programlisting>
|
||
|
||
<para>or<programlisting>FORMAT 3
|
||
#ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP
|
||
# PORT(S) PORT(S)
|
||
DROP:P 1.2.3.4 -
|
||
DROP:PO - 1.2.3.4
|
||
</programlisting></para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>FILES</title>
|
||
|
||
<para>/etc/shorewall/conntrack</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>See ALSO</title>
|
||
|
||
<para><ulink
|
||
url="/configuration_file_basics.htm#Pairs">http://www.shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>
|
||
|
||
<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
|
||
shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
|
||
shorewall-ipsets(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),
|
||
shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
|
||
shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
|
||
shorewall-mangle(5), shorewall-tos(5), shorewall-tunnels(5),
|
||
shorewall-zones(5)</para>
|
||
</refsect1>
|
||
</refentry>
|