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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP" style="color: #3b73af; text-decoration: none">Shibboleth SP - C++</a> / <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-696" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-e775c1a7-a506-4c4f-8b92-bfcdfcee0c14" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-696" style="color: #3b73af; text-decoration: none">SSPCPP-696</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-696" style="color: #3b73af; text-decoration: none">shibboleth-2.0-native-sp-config.xsd prevents use of SHIBSP_LISTENER_ADDRESS</a> </span>
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Affects Versions:
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2.5.6
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Scott Cantor</a>
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Remoting
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Created:
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03/May/16 2:53 PM
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TCPListener
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="vtsji2@idp.protectnetwork.org" id="email_vtsji2@idp.protectnetwork.org" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=vtsji2%40idp.protectnetwork.org" style="color:#3b73af;; color: #3b73af; text-decoration: none">vtsji2@idp.protectnetwork.org</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Background: I'm experimenting with getting multiple identically-configured Apache+mod_shib instances running on different machines to talk to the same shibd instance using TCPListener.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">To avoid a single point of failure in the shibd instance, I wish to spawn multiple such shibds and putting them behind a VIP in failover mode. Since the Apaches already have the necessary configs, it's convenient to spawn a shibd instance next to the Apache on each of the machines.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This requires though that the mod_shib sides all connect to the same VIP, but the shibd sides must still each bind to its local machine's IP. The current TCPListener implementation does not allow for this through XML configuration; it only allows to configure a single IP that both sides must use.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">However, reading through the code I noticed that TCPListener uses the SHIBSP_LISTENER_ADDRESS and SHIBSP_LISTENER_PORT environment variables if no values are provided through the XML config:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
TCPListener::TCPListener(<span class="code-keyword" style="color: #000091">const</span> DOMElement* e)
: SocketListener(e),
m_address(XMLHelper::getAttrString(e, getenv(<span class="code-quote" style="color: #009100">"SHIBSP_LISTENER_ADDRESS"</span>), address)),
m_port(XMLHelper::getAttrInt(e, 0, port))
{
...
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I could use this to solve my problem by just leaving out these values from XML and spawning httpd and shibd under different sets of environment variables.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem is that shibboleth-2.0-native-sp-config.xsd does not allow the 'address' attribute of the <TCPListener> element to be omitted or empty. This effectively means that the SHIBSP_LISTENER_ADDRESS environment variable can never be used.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The port attribute is also not allowed to be omitted or empty, but this can be worked around by setting it to 0 instead.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So my question is:</p>
<ul class="alternate" type="square">
<li>
Could the 'address' attribute of the TCPListener element be made optional (or allowed to have empty values) to allow the SHIBSP_LISTENER_ADDRESS environment value to be observed?
</li>
<li>
To support these kind of VIP/HLB use cases, would you be willing to consider adding the ability to have specify different IP/port combinationsfor the in-process and out-of-process sides in the <TCPListener> element?
</li>
</ul>
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