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Update the Actions document
Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep
parent
f33f333937
commit
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239
docs/Actions.xml
239
docs/Actions.xml
@ -101,8 +101,7 @@
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# both directions.
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#
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######################################################################################
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#TARGET SOURCE DEST PROTO DEST SOURCE RATE USER/
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# PORT PORT(S) LIMIT GROUP
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#TARGET SOURCE DEST PROTO DPORT SPORT RATE USER
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ACCEPT - - udp 135,445
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ACCEPT - - udp 137:139
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ACCEPT - - udp 1024: 137
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@ -335,21 +334,11 @@ ACCEPT - - tcp 135,139,445
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</orderedlist>
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<section>
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<title>Shorewall 4.4.16 and Later.</title>
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<title>Shorewall 5.0.0 and Later.</title>
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<para>Beginning with Shorewall 4.4.16, the columns in action.template
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are the same as those in shorewall-rules (5). The first non-commentary
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line in the template must be</para>
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<programlisting>FORMAT 2</programlisting>
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<para>Beginning with Shorewall 4.5.11, the preferred format is as shown
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below, and the above format is deprecated.</para>
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<programlisting>?FORMAT 2</programlisting>
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<para>When using Shorewall 4.4.16 or later, there are no restrictions
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regarding which targets can be used within your action.</para>
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<para>In Shorewall 5.0, the columns in action.template are the same as
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those in shorewall-rules (5). There are no restrictions regarding which
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targets can be used within your action.</para>
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<para>The SOURCE and DEST columns in the action file may not include
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zone names; those are given when the action is invoked.</para>
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@ -361,22 +350,18 @@ ACCEPT - - tcp 135,139,445
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<para>/etc/shorewall/action.A:</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL
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# PORT(S) PORT(S) DEST
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FORMAT 2
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<programlisting>#TARGET SOURCE DEST PROTO Dport SPORT ORIGDEST
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$1 - - tcp 80 - 1.2.3.4</programlisting>
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<para>/etc/shorewall/rules:</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL
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# PORT(S) PORT(S) DEST
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<programlisting>#TARGET SOURCE DEST PROTO DPORT SPORT ORIGDEST
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A(REDIRECT) net fw</programlisting>
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<para>The above is equivalent to this rule:</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL
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# PORT(S) PORT(S) DEST
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<programlisting>#TARGET SOURCE DEST PROTO DPORT SPORT ORIGDEST
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REDIRECT net - tcp 80 - 1.2.3.4</programlisting>
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<para>You can 'omit' parameters by using '-'.</para>
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@ -413,194 +398,6 @@ REDIRECT net - tcp 80 - 1.2.3.4</programlisting>
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url="configuration_file_basics.htm#ActionVariables">Action Variables
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section</ulink> of the Configuration Basics article.</para>
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</section>
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<section>
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<title>Shorewall 4.4.15 and Earlier.</title>
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<para>Prior to 4.4.16, columns in the
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<filename>action.template</filename> file were as follows:</para>
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<itemizedlist>
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<listitem>
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<para>TARGET - Must be ACCEPT, DROP, REJECT, LOG, CONTINUE, QUEUE or
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an <<emphasis>action</emphasis>> where
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<<emphasis>action</emphasis>> is a previously-defined action
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(that is, it must precede the action being defined in this file in
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your <filename>/etc/shorewall/actions</filename> file). These
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actions have the same meaning as they do in the
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<filename>/etc/shorewall/rules</filename> file (CONTINUE terminates
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processing of the current action and returns to the point where that
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action was invoked). The TARGET may optionally be followed by a
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colon (<quote>:</quote>) and a syslog log level (e.g, REJECT:info or
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ACCEPT:debugging). This causes the packet to be logged at the
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specified level. You may also specify ULOG (must be in upper case)
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as a log level. This will log to the ULOG target for routing to a
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separate log through use of ulogd (<ulink
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url="http://www.netfilter.org/projects/ulogd/index.html">http://www.netfilter.org/projects/ulogd/index.html</ulink>).</para>
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<para>You may also use a <ulink url="Macros.html">macro</ulink> in
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your action provided that the macro's expansion only results in the
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ACTIONs ACCEPT, DROP, REJECT, LOG, CONTINUE, or QUEUE. See
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<filename>/usr/share/shorewall/action.Drop</filename> for an example
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of an action that users macros extensively.</para>
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</listitem>
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<listitem>
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<para>SOURCE - Source hosts to which the rule applies. A
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comma-separated list of subnets and/or hosts. Hosts may be specified
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by IP or MAC address; MAC addresses must begin with <quote>~</quote>
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and must use <quote>-</quote> as a separator.</para>
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<para>Alternatively, clients may be specified by interface name. For
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example, eth1 specifies a client that communicates with the firewall
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system through eth1. This may be optionally followed by another
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colon (<quote>:</quote>) and an IP/MAC/subnet address as described
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above (e.g., eth1:192.168.1.5).</para>
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</listitem>
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<listitem>
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<para>DEST - Location of Server. Same as above with the exception
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that MAC addresses are not allowed.</para>
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</listitem>
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<listitem>
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<para>PROTO - Protocol - Must be <quote>tcp</quote>,
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<quote>udp</quote>, <quote>icmp</quote>, a protocol number, or
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<quote>all</quote>.</para>
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</listitem>
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<listitem>
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<para>DEST PORT(S) - Destination Ports. A comma-separated list of
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Port names (from <filename>/etc/services</filename>), port numbers
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or port ranges; if the protocol is <quote>icmp</quote>, this column
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is interpreted as the destination icmp-type(s).</para>
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<para>A port range is expressed as <<emphasis>low
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port</emphasis>>:<<emphasis>high port</emphasis>>.</para>
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<para>This column is ignored if PROTO = <quote>all</quote>, but must
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be entered if any of the following fields are supplied. In that
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case, it is suggested that this field contain
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<quote>-</quote>.</para>
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</listitem>
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<listitem>
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<para>SOURCE PORT(S) - Port(s) used by the client. If omitted, any
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source port is acceptable. Specified as a comma-separated list of
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port names, port numbers or port ranges.</para>
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<para>If you don't want to restrict client ports but need to specify
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any of the subsequent fields, then place <quote>-</quote> in this
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column.</para>
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</listitem>
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<listitem>
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<para>RATE LIMIT - You may rate-limit the rule by placing a value in
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this column:</para>
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<para><programlisting> <<emphasis>rate</emphasis>>/<<emphasis>interval</emphasis>>[:<<emphasis>burst</emphasis>>]</programlisting>where
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<<emphasis>rate</emphasis>> is the number of connections per
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<<emphasis>interval</emphasis>> (<quote>sec</quote> or
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<quote>min</quote>) and <<emphasis>burst</emphasis>> is the
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largest burst permitted. If no <<emphasis>burst</emphasis>> is
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given, a value of 5 is assumed. There may be no whitespace embedded
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in the specification.</para>
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<para><programlisting> Example: 10/sec:20</programlisting></para>
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</listitem>
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<listitem>
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<para>USER/GROUP - For output rules (those with the firewall as
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their source), you may control connections based on the effective
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UID and/or GID of the process requesting the connection. This column
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can contain any of the following:</para>
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<simplelist>
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<member>[!]<<emphasis>user number</emphasis>>[:]</member>
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<member>[!]<<emphasis>user name</emphasis>>[:]</member>
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<member>[!]:<<emphasis>group number</emphasis>></member>
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<member>[!]:<<emphasis>group name</emphasis>></member>
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<member>[!]<<emphasis>user
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number</emphasis>>:<<emphasis>group
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number</emphasis>></member>
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<member>[!]<<emphasis>user
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name</emphasis>>:<<emphasis>group
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number</emphasis>></member>
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<member>[!]<<emphasis>user
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inumber</emphasis>>:<<emphasis>group
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name</emphasis>></member>
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<member>[!]<<emphasis>user
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name</emphasis>>:<<emphasis>group
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name</emphasis>></member>
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<member>[!]+<<emphasis>program name</emphasis>> (Note:
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support for this form was removed from Netfilter in kernel version
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2.6.14).</member>
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</simplelist>
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</listitem>
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<listitem>
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<para>MARK</para>
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<para><simplelist>
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<member>[!]<<emphasis>value</emphasis>>[/<<emphasis>mask</emphasis>>][:C]</member>
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</simplelist></para>
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<para>Defines a test on the existing packet or connection mark. The
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rule will match only if the test returns true.</para>
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<para>If you don’t want to define a test but need to specify
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anything in the subsequent columns, place a <quote>-</quote> in this
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field.<simplelist>
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<member>! — Inverts the test (not equal)</member>
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<member><<emphasis>value</emphasis>> — Value of the packet
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or connection mark.</member>
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<member><<emphasis>mask</emphasis>> —A mask to be applied
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to the mark before testing.</member>
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<member>:C — Designates a connection mark. If omitted, the
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packet mark’s value is tested. This option is only supported by
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Shorewall-perl</member>
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</simplelist></para>
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</listitem>
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</itemizedlist>
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<para>Omitted column entries should be entered using a dash
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(<quote>-</quote>).</para>
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<para>Example:</para>
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<para><filename>/etc/shorewall/actions</filename>:</para>
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<para><programlisting> #ACTION COMMENT (place '# ' below the 'C' in comment followed by
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# v a comment describing the action)
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LogAndAccept # LOG and ACCEPT a connection</programlisting><emphasis
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role="bold">Note:</emphasis> If your
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<filename>/etc/shorewall/actions</filename> file doesn't have an
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indication where to place the comment, put the <quote>#</quote> in
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column 21.</para>
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<para><phrase><filename>/etc/shorewall/action.LogAndAccept</filename></phrase><programlisting> LOG:info
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ACCEPT</programlisting></para>
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<para>Placing a comment on the line causes the comment to appear in the
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output of the <command>shorewall show actions</command> command.</para>
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<para>To use your action, in <filename>/etc/shorewall/rules</filename>
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you might do something like:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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LogAndAccept loc $FW tcp 22</programlisting>
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</section>
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</section>
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<section id="Logging">
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@ -625,19 +422,19 @@ LogAndAccept loc $FW tcp 22</programlisting>
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<para>/etc/shorewall/action.foo</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#TARGET SOURCE DEST PROTO DPORT
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ACCEPT - - tcp 22
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bar:info</programlisting>
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<para>/etc/shorewall/rules:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#ACTION SOURCE DEST PROTO DPORT
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foo:debug $FW net</programlisting>
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<para>Logging in the invoke <quote>foo</quote> action will be as if
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foo had been defined as:</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#TARGET SOURCE DEST PROTO DPORT
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ACCEPT:debug - - tcp 22
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bar:info</programlisting>
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</listitem>
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@ -651,19 +448,19 @@ bar:info</programlisting>
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<para>/etc/shorewall/action.foo</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#TARGET SOURCE DEST PROTO DPORT
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ACCEPT - - tcp 22
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bar:info</programlisting>
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<para>/etc/shorewall/rules:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#ACTION SOURCE DEST PROTO DPORT
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foo:debug! $FW net</programlisting>
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<para>Logging in the invoke <quote>foo</quote> action will be as if
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foo had been defined as:</para>
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<programlisting>#TARGET SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#TARGET SOURCE DEST PROTO DPORT
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ACCEPT:debug - - tcp 22
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bar:debug</programlisting>
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</listitem>
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@ -1113,22 +910,22 @@ add_rule $chainref, '-d 224.0.0.0/4 -j DROP';
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role="bold">SSHA</emphasis>, and to limit SSH connections to 3 per minute,
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use this entry in <filename>/etc/shorewall/rules</filename>:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#ACTION SOURCE DEST PROTO DPORT
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Limit:none:SSHA,3,60 net $FW tcp 22</programlisting>
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<para>Using Shorewall 4.4.16 or later, you can also invoke the action this
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way:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#ACTION SOURCE DEST PROTO DPORT
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Limit(SSHA,3,60):none net $FW tcp 22</programlisting>
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<para>If you want dropped connections to be logged at the info level, use
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this rule instead:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<programlisting>#ACTION SOURCE DEST PROTO DPORT
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Limit:info:SSHA,3,60 net $FW tcp 22</programlisting>
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<para>Shorewall 4.4.16 and later:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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<para>Shorewall 4.4.16 and later:<programlisting>#ACTION SOURCE DEST PROTO DPORT
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Limit(SSH,3,60):info net $FW tcp 22</programlisting></para>
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<para>To summarize, you pass four pieces of information to the Limit
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