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Subject: [xacml] change request: subject attribute designators




From: Simon Godik <simon@godik.com>
To: xacml@lists.oasis-open.org
Date: Tue, 01 Oct 2002 15:41:39 -0700









Xacml request context allows for multiple subjects. 
Each subject block is identified with the subject-category.
Subject-category identifies different 'actors': 
access-subject, codesource, etc.
 
Category of 'access-subject' is requestor's 
identity.
 
There are use cases, such as 'integrated login' 
where multiple auth mechanisms are integrated.
Sun solves this with 'pluggable auth module' 
framework (pam). Pam allows for multiple
authentication protocols to be configured per 
application.
 
This shows that xacml context may contain multiple 
subject blocks with the same category
of 'access-subject': separate block per 
authentication protocol.
 
Subject blocks are accessed with 
subject-attribute-designators.
 
Assumpsion: subject block is uniquely 
addressed by subject-category
and authentication protocol.
 
Proposal.
Drop DataType attribue of the 
<xacml-context:AttributeType>.
 
Extend xacml:subject-attribute-designator with 
subject-category, and protocol attributes:
<complexType name 
SubjectAttributeDesignatorType>
    <attribute name="AttributeId" 
type="xs:string" use="required"/>
    <attribute name="Issuer" 
type="xs:anyURI" use="optional"/>
    <attribute 
name="SubjectCategory" type="xs:string" use="optional"/> 
<-- new
    <attribute 
name="Protocol" type="xs:anyURI" use="optional"/> <-- 
new
</complexType>
 
example 1.1 - match 'group' attribute of a 
subject authenticated with kerberos:
subject-match match-id="string-equal"
    subj-attr-desig attr-id="group" 
issuer="some-issuer" subj-cat="access-subject" 
protocol="kerb"
    attr-value admin
 
example 1.2 - match 'subject-id' attribute of a 
subject authenticated with kerb:
subject-match 
match-id="rfc822Name-match"
    subj-attr-desig 
attr-id="subject-id" subj-cat="access-subject" protocol="kerb"
    attr-value bart@simpson.com
 
Note that in example 1.2 subject block is 
identified by the protocol (kerb), not by the name format.
 
Simon
 





Follow-Ups:

Re: [xacml] change request: subject attribute designators
From: Polar Humenn <polar@syr.edu>








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