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shorewall_code/manpages/shorewall-secmarks.xml
Tom Eastep c7373ada46 Add advice about SAVE/RESTORE
2010-09-17 09:22:48 -07:00

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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-secmarks</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>secmarks</refname>
<refpurpose>Shorewall file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>/etc/shorewall/secmarks</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The secmarks file is used to associate an SELinux context with
packets. It was added in Shorewall version 4.4.13.</para>
<para>The columns in the file are as follows.</para>
<variablelist>
<varlistentry>
<term><emphasis role="bold">SECMARK -
{SAVE|RESTORE|<replaceable>context</replaceable>|COMMENT
<replaceable>comment</replaceable>}</emphasis></term>
<listitem>
<variablelist>
<varlistentry>
<term><emphasis role="bold">SAVE</emphasis></term>
<listitem>
<para>If an SELinux context is associated with the packet, the
context is saved in the connection. Normally, the remaining
columns should be left blank.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">RESTORE</emphasis></term>
<listitem>
<para>If an SELinux context is not currently associated with
the packet, then the saved context (if any) is associated with
the packet. Normally, the remaining columns should be left
blank.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable role="bold">context</replaceable></term>
<listitem>
<para>An SELinux context.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>COMMENT</term>
<listitem>
<para>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>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">CHAIN:STATE -
{P|I|F|O|T}[:{N|E|ER}]</emphasis></term>
<listitem>
<para>This column determines the CHAIN where the SElinux context is
to be applied:</para>
<simplelist>
<member>P - PREROUTING</member>
<member>I - INPUT</member>
<member>F - FORWARD</member>
<member>O - OUTPUT</member>
<member>T - POSTROUTING</member>
</simplelist>
<para>It may be optionally followed by a colon and an indication of
the connection state(s) at which the context is to be
applied:</para>
<simplelist>
<member>:N - NEW connection</member>
<member>:E - ESTABLISHED connection</member>
<member>:ER - ESTABLISHED or RELATED connection</member>
</simplelist>
</listitem>
</varlistentry>
</variablelist>
<variablelist>
<varlistentry>
<term><emphasis role="bold">SOURCE</emphasis> - {<emphasis
role="bold">-</emphasis><emphasis>interface</emphasis>|[<emphasis>interface</emphasis>:]<emphasis>address-or-range</emphasis>[<emphasis
role="bold">,</emphasis><emphasis>address-or-range</emphasis>]...}[<emphasis>exclusion</emphasis>]</term>
<listitem>
<para>May be:</para>
<orderedlist>
<listitem>
<para>An interface name - matches traffic entering the firewall
on the specified interface. May not be used in classify rules or
in rules using the T in the CHAIN column.</para>
</listitem>
<listitem>
<para>A comma-separated list of host or network IP addresses or
MAC addresses.</para>
</listitem>
<listitem>
<para>An interface name followed by a colon (":") followed by a
comma-separated list of host or network IP addresses or MAC
addresses.</para>
</listitem>
</orderedlist>
<para>MAC addresses must be prefixed with "~" and use "-" as a
separator.</para>
<para>Example: ~00-A0-C9-15-39-78</para>
<para>You may exclude certain hosts from the set already defined
through use of an <emphasis>exclusion</emphasis> (see <ulink
url="shorewall-exclusion.html">shorewall-exclusion</ulink>(5)).</para>
<para>Addresses may be specified using an ipset name preceded by
'+'.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">DEST</emphasis> - {<emphasis
role="bold">-</emphasis>|{<emphasis>interface</emphasis>|[<emphasis>interface</emphasis>:]<emphasis>address-or-range</emphasis>[<emphasis
role="bold">,</emphasis><emphasis>address-or-range</emphasis>]...}[<emphasis>exclusion</emphasis>]</term>
<listitem>
<para>May be:</para>
<orderedlist>
<listitem>
<para>An interface name. May not be used in the PREROUTING or
INPUT chains. The interface name may be optionally followed by a
colon (":") and an IP address list.</para>
</listitem>
<listitem>
<para>A comma-separated list of host or network IP addresses.
The list may include ip address ranges if your kernel and
iptables include iprange support.</para>
</listitem>
</orderedlist>
<para>You may exclude certain hosts from the set already defined
through use of an <emphasis>exclusion</emphasis> (see <ulink
url="shorewall-exclusion.html">shorewall-exclusion</ulink>(5)).</para>
<para>Addresses may be specified using an ipset name preceded by
'+'.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">PROTO</emphasis> - {<emphasis
role="bold">-</emphasis>|<emphasis
role="bold">tcp:syn</emphasis>|<emphasis
role="bold">ipp2p</emphasis>|<emphasis
role="bold">ipp2p:udp</emphasis>|<emphasis
role="bold">ipp2p:all</emphasis>|<emphasis>protocol-number</emphasis>|<emphasis>protocol-name</emphasis>|<emphasis
role="bold">all}</emphasis></term>
<listitem>
<para>Protocol - <emphasis role="bold">ipp2p</emphasis> requires
ipp2p match support in your kernel and iptables.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">PORT(S)</emphasis> (Optional) - [<emphasis
role="bold">-</emphasis>|<emphasis>port-name-number-or-range</emphasis>[<emphasis
role="bold">,</emphasis><emphasis>port-name-number-or-range</emphasis>]...]</term>
<listitem>
<para>Destination Ports. A comma-separated list of Port names (from
services(5)), <emphasis>port number</emphasis>s or <emphasis>port
range</emphasis>s; if the protocol is <emphasis
role="bold">icmp</emphasis>, this column is interpreted as the
destination icmp-type(s). ICMP types may be specified as a numeric
type, a numberic type and code separated by a slash (e.g., 3/4), or
a typename. See <ulink
url="http://www.shorewall.net/configuration_file_basics.htm#ICMP">http://www.shorewall.net/configuration_file_basics.htm#ICMP</ulink>.</para>
<para>If the protocol is <emphasis role="bold">ipp2p</emphasis>,
this column is interpreted as an ipp2p option without the leading
"--" (example <emphasis role="bold">bit</emphasis> for bit-torrent).
If no PORT is given, <emphasis role="bold">ipp2p</emphasis> is
assumed.</para>
<para>This column is ignored if PROTOCOL = all but must be entered
if any of the following field is supplied. In that case, it is
suggested that this field contain "-"</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">SOURCE PORT(S)</emphasis> (Optional) -
[<emphasis
role="bold">-</emphasis>|<emphasis>port-name-number-or-range</emphasis>[<emphasis
role="bold">,</emphasis><emphasis>port-name-number-or-range</emphasis>]...]</term>
<listitem>
<para>Source port(s). If omitted, any source port is acceptable.
Specified as a comma-separated list of port names, port numbers or
port ranges.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">USER</emphasis> (Optional) - [<emphasis
role="bold">!</emphasis>][<emphasis>user-name-or-number</emphasis>][<emphasis
role="bold">:</emphasis><emphasis>group-name-or-number</emphasis>]</term>
<listitem>
<para>This column may only be non-empty if the SOURCE is the
firewall itself.</para>
<para>When this column is non-empty, the rule applies only if the
program generating the output is running under the effective
<emphasis>user</emphasis> and/or <emphasis>group</emphasis>
specified (or is NOT running under that id if "!" is given).</para>
<para>Examples:</para>
<variablelist>
<varlistentry>
<term>joe</term>
<listitem>
<para>program must be run by joe</para>
</listitem>
</varlistentry>
<varlistentry>
<term>:kids</term>
<listitem>
<para>program must be run by a member of the 'kids'
group</para>
</listitem>
</varlistentry>
<varlistentry>
<term>!:kids</term>
<listitem>
<para>program must not be run by a member of the 'kids'
group</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">MARK</emphasis> - [<emphasis
role="bold">!</emphasis>]<emphasis>value</emphasis>[/<emphasis>mask</emphasis>][<emphasis
role="bold">:C</emphasis>]</term>
<listitem>
<para>Defines a test on the existing packet or connection mark. The
rule will match only if the test returns true.</para>
<para>If you don't want to define a test but need to specify
anything in the following columns, place a "-" in this field.</para>
<variablelist>
<varlistentry>
<term>!</term>
<listitem>
<para>Inverts the test (not equal)</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis>value</emphasis></term>
<listitem>
<para>Value of the packet or connection mark.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis>mask</emphasis></term>
<listitem>
<para>A mask to be applied to the mark before testing.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis role="bold">:C</emphasis></term>
<listitem>
<para>Designates a connection mark. If omitted, the packet
mark's value is tested.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLE</title>
<para>Mark the first incoming packet of a connection on the loopback
interface and destined for address 127.0.0.1 and tcp port 3306 with
context system_u:object_r:mysqld_t:s0 and save that context in the
conntrack table. On subsequent input packets in the connection, set the
context from the conntrack table.</para>
<para><filename>/etc/shorewall/interfaces</filename>:</para>
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
- lo - ignore</programlisting>
<para><filename>/etc/shorewall/secmarks</filename>:</para>
<programlisting>#SECMARK CHAIN: SOURCE DEST PROTO DEST SOURCE USER/ MARK
# STATE PORT(S) PORT(S) GROUP
system_u:object_r:mysqld_packet_t:s0 I:N lo 127.0.0.1 tcp 3306
SAVE I:N lo 127.0.0.1 tcp 3306
RESTORE I:ER</programlisting>
</refsect1>
<refsect1>
<title>FILES</title>
<para>/etc/shorewall/secmarks</para>
</refsect1>
<refsect1>
<title>See ALSO</title>
<para><ulink
url="http://james-morris.livejournal.com/11010.html">http://james-morris.livejournal.com/11010.html</ulink></para>
<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(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-route_rules(5),
shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
</refsect1>
</refentry>
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