84 lines
6.1 KiB
HTML
84 lines
6.1 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Application server security in a TCP/IP network" />
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<meta name="abstract" content="The TCP/IP server has a default security of user ID with clear-text password. This means that, as the server is installed, inbound TCP/IP connection requests must have at least a clear-text password accompanying the user ID under which the server job is to run." />
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<meta name="DC.subject" content="password, encrypted, Kerberos, Diffie-Hellman, encryption" />
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<meta name="keywords" content="password, encrypted, Kerberos, Diffie-Hellman, encryption" />
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<meta name="DC.Relation" scheme="URI" content="rbal1elementsusetcp.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/chgddmtcpa.htm" />
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<title>Application server security in a TCP/IP network</title>
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</head>
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<body id="rbal1targetsecurity"><a name="rbal1targetsecurity"><!-- --></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">Application server security in a TCP/IP network</h1>
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<div><p>The TCP/IP server has a default security of user ID with clear-text
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password. This means that, as the server is installed, inbound TCP/IP connection
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requests must have at least a clear-text password accompanying the user ID
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under which the server job is to run.</p>
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<p>The security can either be changed with the <span class="cmdname">Change DDM TCP/IP
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Attributes (CHGDDMTCPA)</span> command or under the <span class="menucascade"><span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span> > <span class="uicontrol">DDM
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server properties</span></span> in <span class="keyword">iSeries™ Navigator</span>.
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You must have *IOSYSCFG special authority to change this setting.</p>
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<p>There are two settings that can be used for lower server security:</p>
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<ul><li>PWDRQD (*NO) <p>Password is not required.</p>
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</li>
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<li>PWDRQD(*VLDONLY) <p>Password is not required, but must be valid if sent.</p>
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</li>
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</ul>
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<p>The difference between *NO and *VLDONLY is that if a password is sent from
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a client system, it is ignored in the *NO option. In the *VLDONLY option,
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however, if a password is sent, the password is validated for the accompanying
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user ID, and access is denied if incorrect.</p>
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<p>Encrypted password required or PWDRQD(*ENCRYPTED) and Kerberos or PWDRQD(*KERBEROS)
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can be used for higher security levels. If Kerberos is used, user profiles
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must be mapped to Kerberos principles using Enterprise Identity Mapping (EIM). </p>
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<p>The following example shows the use of the <span class="cmdname">Change DDM TCP/IP Attributes
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(CHGDDMTCPA)</span> command to specify that an encrypted password must
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accompany the user ID. To set this option, enter:</p>
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<p><samp class="codeph">CHGDDMTCPA PWDRQD(*ENCRYPTED)</samp></p>
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<div class="p"> <div class="note"><span class="notetitle">Note:</span> The DDM/DRDA TCP/IP server was enhanced in V4R4 to support a form
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of password encryption called password substitution. In V4R5, a more widely-used
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password encryption technique, referred to as the Diffie-Hellman public key
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algorithm was implemented. This is the DRDA<sup>®</sup> standard algorithm and is used by
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the most recently released IBM<sup>®</sup> DRDA application requesters. The older password substitute
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algorithm is used primarily for DDM file access from PC clients. In V5R1,
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a 'strong' password substitute algorithm was also supported. The client and
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server negotiate the security mechanism that will be used, and any of the
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three encryption methods will satisfy the requirement of PWDRQD(*ENCRYPTED),
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as does the use of Secure Sockets Layer (SSL) datastreams.</div>
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</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="rbal1elementsusetcp.htm" title="DDM and DRDA over native TCP/IP does not use i5/OS communications security services and concepts such as communications devices, modes, secure location attributes, and conversation security levels which are associated with Advanced Program-to-Program Communication (APPC). Therefore, security setup for TCP/IP is quite different.">Elements of security in a TCP/IP network</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="../rzalv/rzalvmst.htm">Enterprise Identity Mapping</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/chgddmtcpa.htm">Change DDM TCP/IP Attributes (CHGDDMTCPA) command</a></div>
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</div>
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</div>
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</body>
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</html> |