67 lines
4.2 KiB
HTML
67 lines
4.2 KiB
HTML
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<meta name="DC.Title" content="Secure the TFTP server" />
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<meta name="abstract" content="This article provides recommendations for securing the TFTP server." />
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<title>Secure the TFTP server</title>
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<body id="tcpsectftp"><a name="tcpsectftp"><!-- --></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">Secure the TFTP server</h1>
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<div><p>This article provides recommendations for securing the TFTP server.</p>
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<p>By default, the TFTP server provides very limited access to your system. It is specifically configured to provide the initial code for thin
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clients. As a security administrator, you should be aware of the following
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characteristics of the TFTP server:</p>
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<ul><li>The TFTP server does not require authentication (a user ID and password).
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All TFTP jobs run under the QTFTP user profile. The QTFTP user profile does
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not have a password. Therefore, it is not available for interactive sign-on.
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The QTFTP user profile does not have any special authorities, nor is it explicitly
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authorized to system resources. It uses public authority to access the resources
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that it needs for the thin clients. </li>
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<li>When the TFTP server arrives, it is configured to access the directory
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that contains thin client information. You must have *PUBLIC or QTFTP authorized
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to read or write to that directory. To write to the directory you must have
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*CREATE specified on the <span class="parmname">Allow file writes</span> parameter
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of the <span class="cmdname">CHGTFTPA</span> command. To write to an existing file you
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must have the *REPLACE specified on the <span class="parmname">Allow file writes</span> parameter
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of <span class="cmdname">CHGTFTPA</span>. *CREATE allows you to replace existing files
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or create new files. *REPLACE only allows you to replace existing files. <p>A
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TFTP client cannot access any other directory unless you explicitly define
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the directory with the Change TFTP Attributes (<span class="cmdname">CHGTFTPA</span>)
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command. Therefore, if a local or remote user does attempt to start a TFTP
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session to your system, the user’s ability to access information or cause
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damage is extremely limited.</p>
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</li>
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<li>If you choose to configure your TFTP server to provide other services
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in addition to handling thin clients, you can define an exit program to evaluate
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and authorize every TFTP request. The TFTP server provides a request validation
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exit similar to the exit that is available for the FTP server.</li>
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</ul>
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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="rzamvtcptftp.htm" title="These articles discuss methods for securing the TFTP server for authorized users and preventing access to the TFTP server.">Security considerations for using TFTP server</a></div>
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</div>
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</div>
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