144 lines
8.7 KiB
HTML
144 lines
8.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Authentication services" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Authentication services</title>
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</head>
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<body id="secauth"><a name="secauth"><!-- --></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">Authentication services</h1>
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<div><p></p>
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<div class="section"><p>Classes are provided by the IBM<sup>®</sup> Toolbox for Java™ that interact with the security services
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provided by i5/OS™.
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Specifically, support is provided to authenticate a user identity, sometimes
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referred to as a <em>principal</em>, and password against the i5/OS user registry.
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A credential representing the authenticated user can then be established.
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You can use the credential to alter the identity of the current i5/OS thread
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to perform work under the authorities and permissions of the authenticated
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user. In effect, this swap of identity results in the thread acting as if
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a signon was performed by the authenticated user.</p>
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<div class="note"><span class="notetitle">Note:</span> The services to
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establish and swap credentials are only supported for servers at release
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V5R1M0 or greater. </div>
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</div>
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<div class="section"><h4 class="sectiontitle">Overview of support provided</h4><p>The <a href="as400obj.htm#as400obj">AS400</a> object
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provides authentication for a given user profile and password against the
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server. You can also retrieve Kerberos tickets and profile tokens that represent
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authenticated user profiles and passwords for the system.</p>
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<div class="note"><span class="notetitle">Note:</span> Using
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Kerberos tickets requires that you install J2SDK, v1.4 and configure the Java General
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Security Services (JGSS) Application Programming Interface. For more information
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about JGSS, see the <a href="http://java.sun.com/j2se/1.4/docs/guide/security/index.html" target="_blank">J2SDK, v1.4 Security Documentation</a> <img src="www.gif" alt="Link outside information center" />.</div>
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<p>To use Kerberos tickets,
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set only the system name (and not the password) into the AS400 object. The
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user identity is retrieved through the JGSS framework. You can set only one
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means of authentication in an AS400 object at a time. Setting the password
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clears any Kerberos ticket or profile token.</p>
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<p>To use profile tokens,
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use the <a href="javadoc/com/ibm/as400/access/AS400.html#GETPROFILETOKEN(INT, INT)"> getProfileToken()</a> methods to retrieve instances of the <a href="javadoc/com/ibm/as400/security/auth/ProfileTokenCredential.html"> ProfileTokenCredential</a> class. Think of profile tokens
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as a representation of an authenticated user profile and password for a specific
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server. Profile tokens expire based on time, up to one hour, but can be refreshed
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in certain cases to provide an extended life span.</p>
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<div class="note"><span class="notetitle">Note:</span> If you use the
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ProfileTokenCredential class, make sure to review the information at the bottom
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of this page that discuss the methods for setting tokens.</div>
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<p>The following
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example creates a system object and uses that object to generate a profile
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token. The example then uses the profile token to create another system object,
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and uses the second system object to connect to the command service:</p>
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<pre> AS400 system = new AS400("mySystemName", "MYUSERID", "MYPASSWORD");
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ProfileTokenCredential myPT = system.getProfileToken();
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AS400 system2 = new AS400("mySystemName", myPT);
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system2.connectService(AS400.COMMAND); </pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Setting thread identities</h4><p>You can establish a credential
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on either a remote or local context. Once created, you can serialize or distribute
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the credential as required by the calling application. When passed to a running
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process on the associated server, a credential can be used to modify or <em>swap</em> the i5/OS thread
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identity and perform work on behalf of the previously authenticated user.</p>
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<p>A
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practical application of this support might be in a two tier application,
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with authentication of a user profile and password being performed by a graphical
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user interface on the first tier (i.e. a PC) and work being performed for
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that user on the second tier (the server). By utilizing ProfileTokenCredentials,
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the application can avoid directly passing user IDs and passwords over the
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network. The profile token can then be distributed to the program on the second
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tier, which can perform the <em>swap()</em> and operate under the i5/OS authorities
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and permissions assigned to the user.</p>
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<div class="note"><span class="notetitle">Note:</span> While inherently more secure
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than passing a user profile and password due to limited life span, profile
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tokens should still be considered sensitive information by the application
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and handled accordingly. Since the token represents an authenticated user
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and password, it could potentially be exploited by a hostile application to
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perform work on behalf of that user. It is ultimately the responsibility of
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the application to ensure that credentials are accessed in a secure manner.</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Methods for setting tokens in ProfileTokenCredential</h4><p>The
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methods for setting tokens in ProfileTokenCredential class require that you
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distinguish different ways to specify passwords:</p>
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<ul><li>As a special value, such as *NOPWD or *NOPWDCHK, by using a defined special
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value integer</li>
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<li>As the password for the user profile by using a String that represents
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the password</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> In V5R3, IBM Toolbox for Java deprecates the setToken methods that
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do not require you to distinguish how to specify the password.</div>
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<p>Additionally,
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the setToken methods allow remote users to specify password special values
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and allow longer user profile passwords of up to 128 characters.</p>
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<p>To
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specify a password special value integer, such as *NOPWD or *NOPWDCHK, use
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one of the following methods:</p>
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<ul><li>setToken(AS400Principal principal, int passwordSpecialValue)</li>
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<li>setToken(String name, int passwordSpecialValue)</li>
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</ul>
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<p>The ProfileTokenCredential class includes the following static constants
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for password special value integers:</p>
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<ul><li>ProfileTokenCredential.PW_NOPWD: indicates *NOPWD</li>
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<li>ProfileTokenCredential.PW_NOPWDCHK: indicates *NOPWDCHK</li>
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</ul>
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<p>To specify a user profile password as a String, use one of the following
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methods:</p>
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<ul><li>setTokenExtended(AS400Principal principal, String password)</li>
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<li>setTokenExtended(String name, String password)</li>
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</ul>
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<p>The setTokenExended methods do not allow you to pass password special
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value strings as the password parameter. For example, these methods do not
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allow a password string of *NOPWD.</p>
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<p>For more information, see the following
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Javadoc reference information:</p>
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<blockquote><a href="javadoc/com/ibm/as400/security/auth/ProfileTokenCredential.html"> ProfileTokenCredential</a></blockquote>
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</div>
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<div class="section"><h4 class="sectiontitle">Example</h4><p>Refer to this <a href="sectknex.htm#sectknex">code</a> for
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an example of how to use a profile token credential to swap the i5/OS thread
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identity and perform work on behalf of a specific user.</p>
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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="security.htm" title="">Security classes</a></div>
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</div>
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</div>
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</body>
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</html> |