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<h1 class="topictitle1">DRDA<sup>®</sup> application
server security in an APPC network</h1>
<div><p>When the target server is an <span class="keyword">iSeries™</span> server,
several elements are used together to determine whether a request to access
a remote file is allowed or not.</p>
<div class="section"><h4 class="sectiontitle">User-related security elements</h4><p>The
user-related security elements include the SECURELOC parameter on the target
server, the user ID sent by the source server (if allowed), the password for
the user ID sent by the source server, and a user profile or default user
profile on the target server.</p>
</div>
<div class="section"><h4 class="sectiontitle">Object-related security elements</h4><p>The
object-related security elements include the DDMACC parameter and, optionally,
a user exit program supplied by the user to supplement normal object authority
controls.</p>
</div>
<div class="section"><h4 class="sectiontitle">User-related elements of target security</h4><p>A valid
user profile must exist on the application server (AS) to process distributed
relational database work. You can specify a default user profile for a subsystem
that handles communications jobs on an <span class="keyword">iSeries server</span>.</p>
<p>The
name of the default user profile is specified on the DFTUSR parameter of the <span class="cmdname">Add
Communications Entry (ADDCMNE)</span> command on the AS. The <span class="cmdname">ADDCMNE</span> command
adds a communications entry to a subsystem description used for communications
jobs.</p>
<p>If a default user profile is specified in a communications subsystem,
whether the AS is a secure location or not determines if the default user
profile is used for this request. The SECURELOC parameter on the <span class="cmdname">Create
Device Description (APPC) (CRTDEVAPPC)</span> command, or the secure location
designation on an APPN remote location list, specifies whether the AS is a
secure location.</p>
<ul><li>If *YES is specified for SECURELOC or secure location on the AS, the AS
considers the application requester (AR) a secure location. A user ID and
an Already Verified indicator is expected from the AR with its request. If
a user profile exists on the AS that matches the user ID sent by the requester,
the request is allowed. If not, the request is rejected.</li>
<li>If *NO is specified for the SECURELOC parameter on the AS, the AS does
not consider the AR a secure location. Although the AR still sends a user
ID, the AS does not use this for the request. Instead, a default user profile
on the AS is used for the request, if one is available. If no default user
profile exists on the AS, the request is rejected.</li>
<li>If *VFYENCPWD is specified for SECURELOC on the AS, the AS considers the
AR a secure location, but requires that the user ID and its password be sent
(in encrypted form) to verify the identity of the current user. If the user
profile exists on the AS that matches the user ID sent by the requester, and
that requester has the same password on both systems, the request is allowed.
Otherwise, the request is rejected.</li>
</ul>
<p>The following table shows all of the possible combinations of the
elements that control SNA SECURITY(PGM) on the <span class="keyword">iSeries server</span>.
A "Y" in any of the columns indicates that the element is present or the condition
is met. An "M" in the PWD column indicates that the security manager retrieves
the user's password and sends a protected (encrypted) password if password
protection is active. If a protected password is not sent, no password is
sent. A <em>protected password</em> is a character string that APPC substitutes
for a user password when it starts a conversation. Protected passwords can
be used only when the systems of both partners support password protection
and when the password is created on a system that runs <span class="keyword">i5/OS™</span> or OS/400<sup>®</sup> Version
2 Release 2 or later.</p>
<div class="tablenoborder"><a name="rbae5tssec__sectbl"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbae5tssec__sectbl" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 1. Remote access to a distributed relational database</caption><thead align="left"><tr><th align="center" valign="top" width="11.11111111111111%" id="d0e97">Row</th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e99">UID</th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e101">PWD<sup>1</sup></th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e105">AVI</th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e107">SEC(Y)</th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e109">DFT</th>
<th align="center" valign="top" width="11.11111111111111%" id="d0e111">Valid</th>
<th align="left" valign="top" width="22.22222222222222%" id="d0e113">Access</th>
</tr>
</thead>
<tbody><tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">1</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">2</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">3</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">4</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">5</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">6</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">7</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">8</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">9</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">10</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">11</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use UID</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">12</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">13</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">M<sup>3</sup></td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use DFT or UID<sup>2</sup></td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">14</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">M<sup>3</sup></td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use DFT or UID<sup>2</sup></td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">15</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">M<sup>3</sup></td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">Y</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject or UID<sup>2</sup></td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">16</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">M<sup>3</sup></td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject or UID<sup>2</sup></td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">17</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Used DFT</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">18</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">19</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">Y</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Use DFT</td>
</tr>
<tr><td align="center" valign="top" width="11.11111111111111%" headers="d0e97 ">20</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e99 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e101 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e105 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e107 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e109 ">&nbsp;</td>
<td align="center" valign="top" width="11.11111111111111%" headers="d0e111 ">&nbsp;</td>
<td align="left" valign="top" width="22.22222222222222%" headers="d0e113 ">Reject</td>
</tr>
<tr><td colspan="8" valign="top" headers="d0e97 d0e99 d0e101 d0e105 d0e107 d0e109 d0e111 d0e113 "> <div class="note"><span class="notetitle">Key:</span> <dl><dt class="dlterm">UID</dt>
<dd>User ID sent</dd>
<dt class="dlterm">PWD</dt>
<dd>Password sent</dd>
<dt class="dlterm">AVI</dt>
<dd>Already Verified Indicator set</dd>
<dt class="dlterm">SEC(Y)</dt>
<dd>SECURELOC(YES) specified</dd>
<dt class="dlterm">DFT</dt>
<dd>Default user ID specified in communication subsystem</dd>
<dt class="dlterm">Valid</dt>
<dd>User ID and password are valid</dd>
<dt class="dlterm">Use UID</dt>
<dd>Connection made with supplied user ID</dd>
<dt class="dlterm">Use DFT</dt>
<dd>Connection made with default user ID</dd>
<dt class="dlterm">Reject</dt>
<dd>Connection not made</dd>
</dl>
</div>
<div class="note"><span class="notetitle">Notes:</span> <ol><li>If password protection is active, a protected password is sent.</li>
<li>Use UID when password protection is active.</li>
<li>If password protection is active, the password for the user is retrieved
by the security manager, and a protected password is sent; otherwise, no password
is sent.</li>
</ol>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<p>To avoid having to use default user profiles, create a user profile
on the AS for every AR user that needs access to the distributed relational
database objects. If you decide to use a default user profile, however, make
sure that users are not allowed on the system without proper authorization.
For example, the following command specifies the default user parameter as
DFTUSER(QUSER); this allows the system to accept job start requests without
a user ID or password from a communications request. The communications job
is signed on using the QUSER user profile.</p>
<pre>ADDCMNE SBSD(SAMPLE) DEV(*ALL) DFTUSER(QUSER)</pre>
</div>
</div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbae5elementappc.htm" title="When Distributed Relational Database Architecture (DRDA) is used, the data resources of each server in the DRDA environment should be protected.">Elements of security in an APPC network</a></div>
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<div><a href="rbae5elementappc.htm" title="When Distributed Relational Database Architecture (DRDA) is used, the data resources of each server in the DRDA environment should be protected.">Elements of security in an APPC network</a></div>
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