81 lines
4.4 KiB
HTML
81 lines
4.4 KiB
HTML
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<meta name="DC.Title" content="Security considerations for limiting TCP/IP roaming" />
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<meta name="abstract" content="If your system is connected to a network, you may want to limit your users’ ability to roam the network with TCP/IP applications." />
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<meta name="description" content="If your system is connected to a network, you may want to limit your users’ ability to roam the network with TCP/IP applications." />
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<title>Security considerations for limiting TCP/IP roaming</title>
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</head>
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<body id="tcproam"><a name="tcproam"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Security considerations for limiting TCP/IP roaming</h1>
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<div><p>If your system is connected to a network, you may want to limit
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your users’ ability to roam the network with TCP/IP applications. </p>
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<div class="p">One way to do this is to restrict access to the following client TCP/IP
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commands:<div class="note"><span class="notetitle">Note:</span> These commands might exist in several libraries on your system.
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They are in both the QSYS library and the QTCP library, at a minimum. Be sure
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to locate and secure all occurrences.</div>
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<ul><li>STRTCPFTP</li>
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<li>FTP</li>
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<li>STRTCPTELN</li>
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<li>TELNET</li>
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<li>LPR</li>
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<li>SNDTCPSPLF</li>
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<li>RUNRMTCMD (REXEC client)</li>
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</ul>
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Your users’ possible destinations are determined by the following:<ul><li>Entries in your TCP/IP host table.</li>
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<li>*DFTROUTE entry in the TCP/IP route table. This allows users to enter
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the IP address of the next-hop system when their destination is an unknown
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network. A user can reach or contact a remote network by using the default
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route.</li>
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<li>Remote name server configuration. This support allows another server in
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the network to locate host names for your users.</li>
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<li>Remote system table.</li>
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</ul>
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You need to control who can add entries to these tables and change your
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configuration. You also need to understand the implications of your table
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entries and your configuration. </div>
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<div class="p">Be aware that a knowledgeable user with access to an ILE C compiler can
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create a socket program that can attach to a TCP or UDP port. You can make
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this more difficult by restricting access to the following sockets interface
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files in the QSYSINC library:<ul><li>SYS</li>
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<li>NETINET</li>
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<li>H</li>
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<li>ARPA</li>
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<li>Sockets and SSL</li>
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</ul>
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For service programs, you can restrict use of socket and SSL applications
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that are already compiled by restricting use of these service programs:<ul><li>QSOSRV1</li>
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<li>QSOSRV2</li>
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<li>QSOSKIT(SSL)</li>
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<li>QSOSSLSR(SSL)</li>
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</ul>
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The service programs are shipped with public authority *USE, but the
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authority can be changed to *EXCLUDE (or another value as needed).</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzamvtcpsetupsecurity.htm" title="The following information guides you through the process of setting up TCP/IP security.">Set up TCP/IP security</a></div>
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</div>
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</div>
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