authorization - XACML Obligations -


how use obligations in xacml? reference helpful scenario obligations should refer pip , retrun result pep

thanks

---edit--- example author's comment:

<obligationexpressions>     <obligationexpression obligationid="emailobligation" fulfillon="permit">         <attributeassignmentexpression attributeid="urn:oasis:names:tc:xacml:3.0:example:attribute:text">             <attributedesignator mustbepresent="false" category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" attributeid="urn:oasis:names:tc:xacml:1.0:subject:subject-id" datatype="w3.org/2001/xmlschema#string"/>         </attributeassignmentexpression>     </obligationexpression>  </obligationexpressions>

obligations in xacml (as advice introduced in xacml 3.0) used enrich authorization flow.

a typical xacml response bears decision (either of permit, deny, not applicable, or indeterminate). but, if want tell user why access denied? if want implement "break glass" scenario?

this obligations , advice come in handy. here few examples:

  • deny alice access document d + obligation: email manager, bob, let him know alice tried access document d.
  • deny doctor house right view medical record + obligation: tell doctor house can "break glass" access medical record.
  • allow joe view document d first watermark document before returning joe

in xacml 3.0 obligations , advice can have variable parts such - in examples above - manager's email. parts can retrieved pip.


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