mirror of
https://gitlab.com/shorewall/code.git
synced 2024-12-30 01:58:52 +01:00
553 lines
22 KiB
XML
553 lines
22 KiB
XML
<?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>shorewall6-conntrack</refentrytitle>
|
||
|
||
<manvolnum>5</manvolnum>
|
||
|
||
<refmiscinfo>Configuration Files</refmiscinfo>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>conntrack</refname>
|
||
|
||
<refpurpose>shorewall6 conntrack file</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<cmdsynopsis>
|
||
<command>/etc/shorewall6/conntrack</command>
|
||
</cmdsynopsis>
|
||
</refsynopsisdiv>
|
||
|
||
<refsect1>
|
||
<title>Description</title>
|
||
|
||
<para>The original intent of the <emphasis role="bold">notrack</emphasis>
|
||
file was to exempt certain traffic from Netfilter connection tracking.
|
||
Traffic matching entries in the file were not to be tracked.</para>
|
||
|
||
<para>The role of the file was expanded in Shorewall 4.4.27 to include all
|
||
rules that can be added in the Netfilter <emphasis
|
||
role="bold">raw</emphasis> table. In 4.5.7, the file's name was changed to
|
||
<emphasis role="bold">conntrack</emphasis>.</para>
|
||
|
||
<para>The file supports two different column layouts: FORMAT 1, FORMAT 2,
|
||
and FORMAT 3, FORMAT 1 being the default. The three differ as
|
||
follows:</para>
|
||
|
||
<itemizedlist>
|
||
<listitem>
|
||
<para>in FORMAT 2 and 3, there is an additional leading ACTION
|
||
column.</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para>in FORMAT 3, the SOURCE column accepts no zone name; rather the
|
||
ACTION column allows a SUFFIX that determines the chain(s) that the
|
||
generated rule will be added to.</para>
|
||
</listitem>
|
||
</itemizedlist>
|
||
|
||
<para>When an entry in the following form is encountered, the format of
|
||
the following entries are assumed to be of the specified
|
||
<replaceable>format</replaceable>.</para>
|
||
|
||
<simplelist>
|
||
<member><emphasis role="bold">[?]FORMAT</emphasis>
|
||
<replaceable>format</replaceable></member>
|
||
</simplelist>
|
||
|
||
<para>where <replaceable>format</replaceable> is either <emphasis
|
||
role="bold">1</emphasis>,<emphasis role="bold">2</emphasis> or <emphasis
|
||
role="bold">3</emphasis>.</para>
|
||
|
||
<para>Format 3 was introduced in Shorewall 4.5.10. The optional '?' was
|
||
introduced in Shorewall 4.5.11 and ?FORMAT is the preferred form; the form
|
||
without the '?' is deprecated.</para>
|
||
|
||
<para>Comments may be attached to Netfilter rules generated from entries
|
||
in this file through the use of COMMENT lines. These lines begin with the
|
||
word COMMENT; the remainder of the line is treated as a comment which is
|
||
attached to subsequent rules until another COMMENT line is found or until
|
||
the end of the file is reached. To stop adding comments to rules, use a
|
||
line with only the word COMMENT.</para>
|
||
|
||
<note>
|
||
<para>Beginning with Shorewall 4.5.11, ?COMMENT is a synonym for COMMENT
|
||
and is preferred.</para>
|
||
</note>
|
||
|
||
<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">ACTION</emphasis> - {<emphasis
|
||
role="bold">NOTRACK</emphasis>|<emphasis
|
||
role="bold">CT</emphasis>:<emphasis
|
||
role="bold">helper</emphasis>:<replaceable>name</replaceable>[(<replaceable>arg</replaceable>=<replaceable>val</replaceable>[,...])|<emphasis
|
||
role="bold">CT:notrack</emphasis>|DROP|LOG|NFLOG(<replaceable>nflog-parameters</replaceable>)|IP6TABLES(<replaceable>target</replaceable>)}[:<replaceable>log-level</replaceable>[:<replaceable>log-tag</replaceable>]][:<replaceable>chain-designator</replaceable>]</term>
|
||
|
||
<listitem>
|
||
<para>This column is only present when FORMAT >= 2. Values other
|
||
than NOTRACK require <firstterm>CT Target </firstterm>support in
|
||
your iptables and kernel.</para>
|
||
|
||
<itemizedlist>
|
||
<listitem>
|
||
<para><option>NOTRACK</option> or
|
||
<option>CT:notrack</option></para>
|
||
|
||
<para>Disables connection tracking for this packet. If a
|
||
<replaceable>log-level</replaceable> is specified, the packet
|
||
will also be logged at that level.</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>helper</option>:<replaceable>name</replaceable></para>
|
||
|
||
<para>Attach the helper identified by the
|
||
<replaceable>name</replaceable> to this connection. This is more
|
||
flexible than loading the conntrack helper with preset ports. If
|
||
a <replaceable>log-level</replaceable> is specified, the packet
|
||
will also be logged at that level.</para>
|
||
|
||
<para>At this writing, the available helpers are:</para>
|
||
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term>amanda</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the amanda netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>ftp</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the FTP netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>irc</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the IRC netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>netbios-ns</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the netbios_ns (sic) helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>RAS and Q.931</term>
|
||
|
||
<listitem>
|
||
<para>These require that the H323 netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>pptp</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the pptp netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>sane</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the SANE netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>sip</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the SIP netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>snmp</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the SNMP netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>tftp</term>
|
||
|
||
<listitem>
|
||
<para>Requires that the TFTP netfilter helper is
|
||
present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
|
||
<para>May be followed by an option list of
|
||
<replaceable>arg</replaceable>=<replaceable>val</replaceable>
|
||
pairs in parentheses:</para>
|
||
|
||
<itemizedlist>
|
||
<listitem>
|
||
<para><option>ctevents</option>=<replaceable>event</replaceable>[,...]</para>
|
||
|
||
<para>Only generate the specified conntrack events for this
|
||
connection. Possible event types are: <emphasis
|
||
role="bold">new</emphasis>, <emphasis
|
||
role="bold">related</emphasis>, <emphasis
|
||
role="bold">destroy</emphasis>, <emphasis
|
||
role="bold">reply</emphasis>, <emphasis
|
||
role="bold">assured</emphasis>, <emphasis
|
||
role="bold">protoinfo</emphasis>, <emphasis
|
||
role="bold">helper</emphasis>, <emphasis
|
||
role="bold">mark</emphasis> (this is connection mark, not
|
||
packet mark), <emphasis role="bold">natseqinfo</emphasis>,
|
||
and <emphasis role="bold">secmark</emphasis>. If more than
|
||
one <emphasis>event</emphasis> is listed, the
|
||
<replaceable>event</replaceable> list must be enclosed in
|
||
parentheses (e.g., ctevents=(new,related)).</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>expevents</option><option>=new</option></para>
|
||
|
||
<para>Only generate a <emphasis role="bold">new</emphasis>
|
||
expectation events for this connection.</para>
|
||
</listitem>
|
||
</itemizedlist>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>DROP</option></para>
|
||
|
||
<para>Added in Shorewall 4.5.10. Silently discard the packet. If
|
||
a <replaceable>log-level</replaceable> is specified, the packet
|
||
will also be logged at that level.</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>IP6TABLES</option>(<replaceable>target</replaceable>)</para>
|
||
|
||
<para>Added in Shorewall 4.6.0. Allows you to specify any
|
||
iptables <replaceable>target</replaceable> with target options
|
||
(e.g., "IP6TABLES(AUDIT --type drop)"). If the target is not one
|
||
recognized by Shorewall, the following error message will be
|
||
issued:</para>
|
||
|
||
<simplelist>
|
||
<member>ERROR: Unknown target
|
||
(<replaceable>target</replaceable>)</member>
|
||
</simplelist>
|
||
|
||
<para>This error message may be eliminated by adding
|
||
<replaceable>target</replaceable> as a builtin action in <ulink
|
||
url="/manpages6/shorewall6-actions.html">shorewall6-actions(5)</ulink>.</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>LOG</option></para>
|
||
|
||
<para>Added in Shoreawll 4.6.0. Logs the packet using the
|
||
specified <replaceable>log-level</replaceable> and<replaceable>
|
||
log-tag </replaceable>(if any). If no log-level is specified,
|
||
then 'info' is assumed.</para>
|
||
</listitem>
|
||
|
||
<listitem>
|
||
<para><option>NFLOG</option></para>
|
||
|
||
<para>Added in Shoreawll 4.6.0. Queues the packet to a backend
|
||
logging daemon using the NFLOG netfilter target with the
|
||
specified <replaceable>nflog-parameters</replaceable>.</para>
|
||
</listitem>
|
||
</itemizedlist>
|
||
|
||
<para>When FORMAT = 1, this column is not present and the rule is
|
||
processed as if NOTRACK had been entered in this column.</para>
|
||
|
||
<para>Beginning with Shorewall 4.5.10, when FORMAT = 3, this column
|
||
can end with a colon followed by a
|
||
<replaceable>chain-designator</replaceable>. The
|
||
<replaceable>chain-designator</replaceable> can be one of the
|
||
following:</para>
|
||
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term>P</term>
|
||
|
||
<listitem>
|
||
<para>The rule is added to the raw table PREROUTING chain.
|
||
This is the default if no
|
||
<replaceable>chain-designator</replaceable> is present.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>O</term>
|
||
|
||
<listitem>
|
||
<para>The rule is added to the raw table OUTPUT chain.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>PO or OP</term>
|
||
|
||
<listitem>
|
||
<para>The rule is added to the raw table PREROUTING and OUTPUT
|
||
chains.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>SOURCE (formats 1 and 2) ‒
|
||
<emphasis>zone</emphasis>[:<emphasis>interface</emphasis>][:<emphasis>address-list</emphasis>]</term>
|
||
|
||
<listitem>
|
||
<para>where <replaceable>zone</replaceable> is the name of a zone,
|
||
<replaceable>interface</replaceable> is an interface to that zone,
|
||
and <replaceable>address-list</replaceable> is a comma-separated
|
||
list of addresses (may contain exclusion - see <ulink
|
||
url="/manpages6/shorewall6-exclusion.html">shorewall6-exclusion</ulink>
|
||
(5)).</para>
|
||
|
||
<para>Beginning with Shorewall 4.5.7, <option>all</option> can be
|
||
used as the <replaceable>zone</replaceable> name to mean
|
||
<firstterm>all zones</firstterm>.</para>
|
||
|
||
<para>Beginning with Shorewall 4.5.10, <option>all-</option> can be
|
||
used as the <replaceable>zone</replaceable> name to mean all
|
||
<firstterm>off-firewall zone</firstterm>s.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>SOURCE (format 3) ‒
|
||
{-|<emphasis>interface</emphasis>[:<emphasis>address-list</emphasis>]|<replaceable>address-list</replaceable>}</term>
|
||
|
||
<listitem>
|
||
<para>Where <replaceable>interface</replaceable> is an interface to
|
||
that zone, and <replaceable>address-list</replaceable> is a
|
||
comma-separated list of addresses (may contain exclusion - see
|
||
<ulink
|
||
url="/manpages6/shorewall6-exclusion.html">shorewall6-exclusion</ulink>
|
||
(5)).</para>
|
||
|
||
<para>COMMENT is only allowed in format 1; the remainder of the line
|
||
is treated as a comment that will be associated with the generated
|
||
rule(s).</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>DEST ‒
|
||
{-|<emphasis>interface</emphasis>[:<emphasis>address-list</emphasis>]|<replaceable>address-list</replaceable>}</term>
|
||
|
||
<listitem>
|
||
<para>where <replaceable>address-list</replaceable> is a
|
||
comma-separated list of addresses (may contain exclusion - see
|
||
<ulink
|
||
url="/manpages6/shorewall6-exclusion.html">shorewall6-exclusion</ulink>
|
||
(5)).</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>PROTO ‒
|
||
<replaceable>protocol-name-or-number</replaceable>[,...]</term>
|
||
|
||
<listitem>
|
||
<para>A protocol name from <filename>/etc/protocols</filename> or a
|
||
protocol number.</para>
|
||
|
||
<para>Beginning with Shorewall 4.5.12, this column can accept a
|
||
comma-separated list of protocols.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>DEST PORT(S) (dport) -
|
||
{-|<replaceable>port-number/service-name-list</replaceable>|+<replaceable>ipset</replaceable>}</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
|
||
<replaceable>low-port</replaceable>:<replaceable>high-port</replaceable>
|
||
if your kernel and iptables include port range support.</para>
|
||
|
||
<para>Beginning with Shorewall 4.6.0, an ipset name can be specified
|
||
in this column. This is intended to be used with
|
||
<firstterm>bitmap:port</firstterm> ipsets.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>SOURCE PORT(S) (sport) -
|
||
{-|<replaceable>port-number/service-name-list</replaceable>|+<replaceable>ipset</replaceable>}</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
|
||
<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
|
||
causes the rule to match when either the source port or the
|
||
destination port in a packet matches one of the ports specified in
|
||
DEST PORTS(S).</para>
|
||
|
||
<para>Beginning with Shorewall 4.6.0, an ipset name can be specified
|
||
in this column. This is intended to be used with
|
||
<firstterm>bitmap:port</firstterm> ipsets.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term>USER/GROUP (user) ‒
|
||
[<replaceable>user</replaceable>][:<replaceable>group</replaceable>]</term>
|
||
|
||
<listitem>
|
||
<para>May only be specified if the SOURCE
|
||
<replaceable>zone</replaceable> is $FW. Specifies the effective user
|
||
id and or group id of the process sending the traffic.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><emphasis role="bold">SWITCH -
|
||
[!]<replaceable>switch-name</replaceable>[={0|1}]</emphasis></term>
|
||
|
||
<listitem>
|
||
<para>Added in Shorewall6 4.5.10 and allows enabling and disabling
|
||
the rule without requiring <command>shorewall6
|
||
restart</command>.</para>
|
||
|
||
<para>Enables the rule if the value stored in
|
||
<filename>/proc/net/nf_condition/<replaceable>switch-name</replaceable></filename>
|
||
is 1. Disables the rule 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>shorewall6
|
||
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>EXAMPLES</title>
|
||
|
||
<para>Example 1:</para>
|
||
|
||
<para>Use the FTP helper for TCP port 21 connections from the firewall
|
||
itself.</para>
|
||
|
||
<programlisting>FORMAT 2
|
||
#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 2001:1.2.3::4</para>
|
||
|
||
<programlisting>FORMAT 2
|
||
#ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP
|
||
# PORT(S) PORT(S)
|
||
DROP all-:2001:1.2.3::4 -
|
||
DROP all 2001:1.2.3::4
|
||
</programlisting>
|
||
|
||
<para>or<programlisting>FORMAT 3
|
||
#ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP
|
||
# PORT(S) PORT(S)
|
||
DROP:P 2001:1.2.3::4 -
|
||
DROP:PO - 2001:1.2.3::4
|
||
</programlisting></para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>FILES</title>
|
||
|
||
<para>/etc/shorewall6/notrack</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>shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5),
|
||
shorewall6-blacklist(5), shorewall6-hosts(5), shorewall6-interfaces(5),
|
||
shorewall6-ipsec(5), shorewall6-netmap(5),shorewall6-params(5),
|
||
shorewall6-policy(5), shorewall6-providers(5), shorewall6-proxyarp(5),
|
||
shorewall6-rtrules(5), shorewall6-routestopped(5), shorewall6-rules(5),
|
||
shorewall6.conf(5), shorewall6-secmarks(5), shorewall6-tcclasses(5),
|
||
shorewall6-tcdevices(5), shorewall6-mangle(5), shorewall6-tos(5),
|
||
shorewall6-tunnels(5), shorewall-zones(5)</para>
|
||
</refsect1>
|
||
</refentry>
|