The root <md:EntitiesDescriptor> element of a remotely obtained metadata file should be decorated with a validUntil XML attribute. Before the metadata is loaded, the expiration date is checked. If the validUntil attribute indicates the metadata is expired, the metadata is discarded.
The validity check described in the previous paragraph is always performed, regardless of the filters applied to the metadata. In addition to this basic validity check, the RequiredValidUntil filter is used to detect metadata that never expires or has too long a validity period, both of which undermine the usual trust model supported by Shibboleth. In particular, the RequiredValidUntil filter refuses to load the metadata if either of the following conditions is true:
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| Note | ||
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Under normal circumstances, it is very important to configure this filter because expiring metadata is how trust revocation is enforced. See the TrustManagement topic for details. |
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Schema
The <MetadataFilter> element and the type RequiredValidUntil are defined by the urn:mace:shibboleth:2.0:metadata schema, which can be located at http://shibboleth.net/schema/idp/shibboleth-metadata.xsd.
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Attributes
| Name | Type | Default | Description |
|---|---|---|---|
| ISO 8601 duration | PT0S (zero) | Defines the window within which the metadata is valid |
| Warning |
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If a zero duration is specified, or the maxValidityInterval XML attribute is omitted, any value of validUntil will be accepted (which is probably not what you want to do). |
Child Elements
None
Example
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<!--
Require a validUntil XML attribute on the EntitiesDescriptor element
and make sure its value is no more than 14 days into the future.
-->
<MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="P14D"/>
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