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Conceptually, you can think of this mechanism as equivalent to a networked set of LDAP or X.500 directories queried by DN, merely in SAML terms. It is, however, relatively easy to implement and support when there are batch processes in place for the exchange of identity data to establish the links. No user intervention is required, which is a plus for simplicity but a minus for privacy and user control.

After each query is performed, the resolver applies the attribute extractor and filter configured for the application before continuing with other queries and eventually returning the resulting attributes. Each filtering step will operate on only the attributes extracted as a result of a particular query, and the filter policies can be expressed in terms of the actual "issuer" of each set of attributes for fine-grained control.

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Attributes

  • policyId (string)
    • Optional reference to a Security Policy to apply to the resulting messages and SAML assertions obtained. If omitted, the application's default policy is used.
  • attributeId (space-delimited list of strings)
    • Optional list of attribute IDs to search for a value to use as the identifier in the queries performed. The first attribute value found will be used as the value of the <NameID>. If this attribute is omitted, the original <NameID> supplied by the user's original IdP is simply copied directly.
  • format (URI)
    • Optional value to use as the Format attribute in a "generated" <NameID> created from an arbitrary source attribute using the attributeId setting above. This value is ignored if the attributeId setting is omitted, or if the specified attribute used is a so-called "NameID-valued" attribute that resulted from a NameID-aware attribute decoder.

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Child Elements

  • <Entity> (zero or more)
    • The value of the element is an entityID to query against. Metadata for a SAML 2.0 Attribute Authority role must be available.
  • <EntityReference> {zero or more)
    • The value of the element is the ID of an attribute available for the user. Each of the attribute's serialized values is interpreted as an entityID, as per the <Entity> element above.

Note that the <Entity> and <EntityReference> elements can be supplied in any order, and are processed in the order they appear, with a query attempt per entityID obtained.

  • <saml2:Attribute> (zero or more)
    • Supplies a set of attribute and value filters to include in any queries.

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