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Add example to Manual Chains document
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@7560 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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@ -54,23 +54,13 @@
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<informaltable frame="none">
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<tgroup align="left" cols="3">
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<tbody>
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<row>
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<entry></entry>
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<entry><ulink url="PortKnocking.html#Limit">Limiting per-IPaddress
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Connection Rate</ulink></entry>
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<entry><ulink url="ScalabilityAndPerformance.html">Scalability and
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Performance</ulink></entry>
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</row>
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<row>
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<entry><ulink url="Accounting.html">Accounting</ulink></entry>
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<entry><ulink url="shorewall_logging.html">Logging</ulink></entry>
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<entry><ulink url="CompiledPrograms.html#Lite">Shorewall
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Lite</ulink></entry>
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<entry><ulink url="ScalabilityAndPerformance.html">Scalability and
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Performance</ulink></entry>
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</row>
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<row>
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@ -78,8 +68,8 @@
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<entry><ulink url="Macros.html">Macros</ulink></entry>
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<entry><ulink url="Modularization.html">Shorewall
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Modularization</ulink></entry>
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<entry><ulink url="CompiledPrograms.html#Lite">Shorewall
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Lite</ulink></entry>
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</row>
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<row>
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@ -89,8 +79,8 @@
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<entry><ulink url="MAC_Validation.html">MAC
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Verification</ulink></entry>
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<entry><ulink url="Shorewall-4.html">Shorewall 4.x</ulink> --
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What's new</entry>
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<entry><ulink url="Modularization.html">Shorewall
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Modularization</ulink></entry>
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</row>
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<row>
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@ -99,14 +89,26 @@
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<entry><ulink url="Manpages.html">Man Pages</ulink></entry>
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<entry><ulink url="Shorewall-perl.html">Shorewall
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Perl</ulink></entry>
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<entry><ulink url="Shorewall-4.html">Shorewall 4.x</ulink> --
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What's new</entry>
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</row>
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<row>
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<entry><ulink url="traffic_shaping.htm">Bandwidth Control</ulink>
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(<ulink url="traffic_shaping_ru.html">Russian</ulink>)</entry>
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<entry><ulink url="ManualChains.html">Manual
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Chains</ulink></entry>
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<entry><ulink url="Shorewall-perl.html">Shorewall
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Perl</ulink></entry>
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</row>
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<row>
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<entry><ulink url="blacklisting_support.htm">Blacklisting</ulink>
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(<ulink
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url="blacklisting_support_ru.html">Russian</ulink>)</entry>
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<entry><ulink
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url="two-interface.htm#SNAT">Masquerading</ulink></entry>
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@ -115,9 +117,8 @@
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</row>
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<row>
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<entry><ulink url="blacklisting_support.htm">Blacklisting</ulink>
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(<ulink
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url="blacklisting_support_ru.html">Russian</ulink>)</entry>
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<entry>Bridge: <ulink
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url="bridge-Shorewall-perl.html">Shorewall-perl</ulink></entry>
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<entry><ulink url="MultiISP.html">Multiple Internet Connections
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from a Single Firewall</ulink> (<ulink
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@ -127,8 +128,8 @@
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</row>
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<row>
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<entry>Bridge: <ulink
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url="bridge-Shorewall-perl.html">Shorewall-perl</ulink></entry>
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<entry>Bridge: <ulink url="SimpleBridge.html">No control of
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traffic through the bridge</ulink></entry>
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<entry><ulink url="Multiple_Zones.html">Multiple Zones Through One
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Interface</ulink></entry>
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@ -139,8 +140,7 @@
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</row>
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<row>
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<entry>Bridge: <ulink url="SimpleBridge.html">No control of
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traffic through the bridge</ulink></entry>
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<entry>Commands</entry>
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<entry><ulink url="XenMyWay-Routed.html">My Shorewall
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Configuration</ulink></entry>
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@ -150,8 +150,8 @@
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</row>
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<row>
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<entry><ulink
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url="starting_and_stopping_shorewall.htm">Commands</ulink></entry>
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<entry><ulink url="starting_and_stopping_shorewall.htm">Compiled
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Firewall Programs</ulink></entry>
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<entry><ulink url="NetfilterOverview.html">Netfilter
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Overview</ulink></entry>
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@ -162,8 +162,8 @@
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</row>
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<row>
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<entry><ulink url="CompiledPrograms.html">Compiled Firewall
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Programs</ulink></entry>
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<entry><ulink url="CompiledPrograms.html">Configuration File
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Basics</ulink></entry>
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<entry><ulink url="netmap.html">Network Mapping</ulink></entry>
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@ -172,8 +172,8 @@
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</row>
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<row>
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<entry><ulink url="configuration_file_basics.htm">Configuration
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File Basics</ulink></entry>
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<entry><ulink
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url="configuration_file_basics.htm">DHCP</ulink></entry>
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<entry><ulink url="NAT.htm">One-to-one NAT</ulink> (Static
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NAT)</entry>
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@ -182,7 +182,9 @@
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</row>
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<row>
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<entry><ulink url="dhcp.htm">DHCP</ulink></entry>
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<entry><ulink url="dhcp.htm"><ulink
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url="two-interface.htm#DNAT">DNAT</ulink> (<firstterm>Destination
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Network Address Translation</firstterm>)</ulink></entry>
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<entry><ulink url="Multiple_Zones.html"><ulink
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url="OPENVPN.html">OpenVPN</ulink></ulink></entry>
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@ -192,9 +194,7 @@
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</row>
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<row>
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<entry><ulink url="two-interface.htm#DNAT">DNAT</ulink>
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(<firstterm>Destination Network Address
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Translation</firstterm>)</entry>
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<entry>ECN Disabling by host or subnet</entry>
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<entry><ulink url="starting_and_stopping_shorewall.htm">Operating
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Shorewall</ulink></entry>
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@ -205,8 +205,9 @@
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</row>
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<row>
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<entry><ulink url="ECN.html">ECN Disabling by host or
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subnet</ulink></entry>
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<entry><ulink url="ECN.html"><ulink
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url="shorewall_extension_scripts.htm">Extension Scripts</ulink>
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(User Exits)</ulink></entry>
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<entry><ulink url="PacketMarking.html">Packet
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Marking</ulink></entry>
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@ -215,8 +216,8 @@
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</row>
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<row>
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<entry><ulink url="shorewall_extension_scripts.htm">Extension
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Scripts</ulink> (User Exits)</entry>
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<entry><ulink
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url="fallback.htm">Fallback/Uninstall</ulink></entry>
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<entry><ulink url="PacketHandling.html">Packet Processing in a
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Shorewall-based Firewall</ulink></entry>
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@ -226,8 +227,7 @@
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</row>
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<row>
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<entry><ulink
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url="fallback.htm">Fallback/Uninstall</ulink></entry>
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<entry><ulink url="FAQ.htm">FAQs</ulink></entry>
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<entry><ulink url="ping.html">'Ping' Management</ulink></entry>
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@ -235,7 +235,8 @@
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</row>
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<row>
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<entry><ulink url="FAQ.htm">FAQs</ulink></entry>
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<entry><ulink
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url="shorewall_features.htm">Features</ulink></entry>
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<entry><ulink url="two-interface.htm#DNAT">Port
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Forwarding</ulink></entry>
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@ -244,8 +245,8 @@
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</row>
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<row>
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<entry><ulink
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url="shorewall_features.htm">Features</ulink></entry>
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<entry><ulink url="Multiple_Zones.html">Forwarding Traffic on the
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Same Interface</ulink></entry>
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<entry><ulink url="ports.htm">Port Information</ulink></entry>
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@ -254,8 +255,7 @@
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</row>
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<row>
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<entry><ulink url="Multiple_Zones.html">Forwarding Traffic on the
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Same Interface</ulink></entry>
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<entry><ulink url="FTP.html">FTP and Shorewall</ulink></entry>
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<entry><ulink url="PortKnocking.html">Port Knocking and Other Uses
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of the 'Recent Match'</ulink></entry>
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@ -265,7 +265,8 @@
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</row>
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<row>
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<entry><ulink url="FTP.html">FTP and Shorewall</ulink></entry>
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<entry><ulink url="support.htm">Getting help or answers to
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questions</ulink></entry>
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<entry><ulink url="PPTP.htm">PPTP</ulink></entry>
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@ -274,8 +275,8 @@
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</row>
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<row>
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<entry><ulink url="support.htm">Getting help or answers to
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questions</ulink></entry>
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<entry><ulink url="Install.htm">Installation/Upgrade</ulink>
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(<ulink url="Install_fr.html">Français</ulink>)</entry>
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<entry><ulink url="ProxyARP.htm">Proxy ARP</ulink></entry>
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@ -283,8 +284,7 @@
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</row>
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<row>
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<entry><ulink url="Install.htm">Installation/Upgrade</ulink>
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(<ulink url="Install_fr.html">Français</ulink>)</entry>
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<entry><ulink url="IPP2P.html">IPP2P</ulink></entry>
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<entry><ulink url="shorewall_quickstart_guide.htm">QuickStart
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Guides</ulink></entry>
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@ -293,7 +293,8 @@
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</row>
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<row>
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<entry><ulink url="IPP2P.html">IPP2P</ulink></entry>
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<entry><ulink url="IPSEC-2.6.html">IPSEC using Kernel 2.6 and
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Shorewall 2.1 or Later</ulink></entry>
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<entry><ulink url="ReleaseModel.html">Release
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Model</ulink></entry>
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@ -302,8 +303,7 @@
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</row>
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<row>
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<entry><ulink url="IPSEC-2.6.html">IPSEC using Kernel 2.6 and
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Shorewall 2.1 or Later</ulink></entry>
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<entry><ulink url="ipsets.html">Ipsets</ulink></entry>
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<entry><ulink
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url="shorewall_prerequisites.htm">Requirements</ulink></entry>
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@ -312,7 +312,8 @@
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</row>
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<row>
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<entry><ulink url="ipsets.html">Ipsets</ulink></entry>
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<entry><ulink url="Shorewall_and_Kazaa.html">Kazaa
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Filtering</ulink></entry>
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<entry><ulink url="Shorewall_and_Routing.html">Routing and
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Shorewall</ulink></entry>
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@ -321,8 +322,8 @@
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</row>
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<row>
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<entry><ulink url="Shorewall_and_Kazaa.html">Kazaa
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Filtering</ulink></entry>
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<entry><ulink url="kernel.htm">Kernel
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Configuration</ulink></entry>
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<entry><ulink url="Multiple_Zones.html">Routing on One
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Interface</ulink></entry>
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@ -331,8 +332,8 @@
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</row>
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<row>
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<entry><ulink url="kernel.htm">Kernel
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Configuration</ulink></entry>
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<entry><ulink url="PortKnocking.html#Limit">Limiting per-IPaddress
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Connection Rate</ulink></entry>
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<entry><ulink url="samba.htm">Samba</ulink></entry>
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@ -34,7 +34,7 @@
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</legalnotice>
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</articleinfo>
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<section>
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<section id="Intro">
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<title>Introduction</title>
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<para>Manual chains were introduced in Shorewall-perl 4.0.6; for Perl
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@ -72,9 +72,139 @@
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</itemizedlist>
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</section>
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<section>
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<section id="Example">
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<title>Example</title>
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<para></para>
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<para>This example provides an alternative to the <ulink
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url="PortKnocking.html">Port Knocking</ulink> example.</para>
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<para>In this example, a Knock.pm module is created and placed in
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/etc/shorewall:</para>
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<programlisting>package Knock;
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use strict;
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use warnings;
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use base qw{Exporter};
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use Carp;
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use Shorewall::Chains;
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use Scalar::Util qw{reftype};
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use Shorewall::Config qw{shorewall};
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our @EXPORT = qw{Knock};
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my %recent_names;
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my %chains_created;
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sub scalar_or_array {
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my $arg = shift;
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my $name = shift;
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return () unless defined $arg;
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return ($arg) unless reftype($arg);
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return @$arg if reftype($arg) eq 'ARRAY';
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croak "Expecting argument '$name' to be scalar or array ref";
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}
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sub Knock {
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my $src = shift;
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my $dest = shift;
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my $args = shift;
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my $proto = $args->{proto} || 'tcp';
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my $seconds = $args->{seconds} || 60;
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my $original_dest = $args->{original_dest} || '-';
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my @target = scalar_or_array($args->{target}, 'target');
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my @knocker_ports = scalar_or_array($args->{knocker}, 'knocker');
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my @trap_ports = scalar_or_array($args->{trap}, 'trap');
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if (not defined $args->{name}) {
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# If you don't supply a name, then this must be the single-call
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# variant, so you have to specify all the arguments
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unless (scalar @target) {
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croak "No 'target' ports specified";
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}
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unless (scalar @knocker_ports) {
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croak "No 'knock' ports specified";
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}
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}
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# We'll need a unique name for the recent match list. Construct one
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# from the port and a serial number, if the user didn't supply one.
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my $name = $args->{name} || ($target[0] . '_' . ++$recent_names{$target[0]});
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$name = 'Knock' . $name;
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# We want one chain for all Knock rules that share a 'name' field
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my $chainref = $chains_created{$name};
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unless (defined $chainref) {
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$chainref = $chains_created{$name} = new_manual_chain($name);
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}
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# Logging
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if ($args->{log_level}) {
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foreach my $port (@target) {
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log_rule_limit($args->{log_level},
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$chainref,
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'Knock',
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'ACCEPT',
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'',
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$args->{log_tag} || '',
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'add',
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"-p $proto --dport $port -m recent --rcheck --name $name"
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);
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log_rule_limit($args->{log_level},
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$chainref,
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'Knock',
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'DROP',
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'',
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$args->{log_tag} || '',
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'add',
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"-p $proto --dport ! $port"
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);
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}
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}
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# Add the recent match rules to the manual chain
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foreach my $knock (@knocker_ports) {
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add_rule($chainref, "-p $proto --dport $knock -m recent --name $name --set -j DROP");
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}
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foreach my $trap (@trap_ports) {
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add_rule($chainref, "-p $proto --dport $trap -m recent --name $name --remove -j DROP");
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}
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foreach my $port (@target) {
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add_rule($chainref, "-p $proto --dport $port -m recent --rcheck --seconds $seconds --name $name -j ACCEPT");
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}
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# And add a rule to the main chain(s) to jump into the manual chain at the appropriate points
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my $all_dest_ports = join(',', @target, @knocker_ports, @trap_ports);
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shorewall "$chainref->{name} $src $dest $proto $all_dest_ports - $original_dest";
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return 1;
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}
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1;</programlisting>
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<para>This simplifies /etc/shorewall/compile:<programlisting>use Knock;
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1;</programlisting></para>
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<para>The rule from the Port Knocking article:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
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SSHKnock net $FW tcp 22,1599,1600,1601
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</programlisting>
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<para>becomes:<programlisting>PERL Knock 'net', 'loc:192.168.1.5', {target => 22, knocker => 1600, trap => [1599, 1601]};</programlisting>Similarly<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL
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# PORT(S) DEST
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DNAT- net loc:192.168.1.5 tcp 22 - 206.124.146.178
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SSHKnock net $FW tcp 1599,1600,1601
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SSHKnock net loc:192.168.1.5 tcp 22 - 206.124.146.178</programlisting>becomes:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL
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# PORT(S) DEST
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DNAT- net loc:192.168.1.5 tcp 22 - 206.124.146.178
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PERL Knock 'net', '$FW', {name => 'SSH', knocker => 1600, trap => [1599, 1601]};
|
||||
PERL Knock 'net', 'loc:192.168.1.5', {name => 'SSH', target => 22, original_dest => '206.124.136.178'};</programlisting></para>
|
||||
</section>
|
||||
</article>
|
||||
@ -165,6 +165,9 @@ SSHKnock net loc:192.168.1.5 tcp 22 -
|
||||
</note>
|
||||
</listitem>
|
||||
</orderedlist>
|
||||
|
||||
<para>For another way to implement Port Knocking, see the <ulink
|
||||
url="ManualChains.html">Manual Chain</ulink> documentation.</para>
|
||||
</section>
|
||||
|
||||
<section id="Limit">
|
||||
|
||||
Loading…
Reference in New Issue
Block a user