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Subject: DRAFT minutes from F2F
here are my notes from the F2F meeting this week. i welcome review and
input from those who attended (if possible before the next concall).
i think that the meeting was quite successful in providing understanding
on the requirements, goals and definitions of the Work Items proposed
for version two. from the discussions it is apparent that XACML will be
tackling some complex issues, but the general feeling seems to be that
we now have enough common understanding to move forward effectively via
concall and mailing list.
b
+++
F2F Meeting – Oct. 20, 2003 – BEA, San Jose
Attendance:
Frank Siebenlist
Anne Anderson
Tim Moses
Polar Humenn
Daniel Engovatov
Bill Parducci
Michiharu Kudo
Michael McIntosh
Anthony Nadalin
MaryAnn Hondo
Jacques Durand
Hal Lockhart
Reviewed Work Items:
(minutes refer to discussion topics by Work Item number)
2. Seth now Champion for the modified version of this WI. A new item
(#41) has been created to cover generalizing classification of entities
and declaration (third schema to represent?) Daniel will address this
by Nov. 3.
7. Proposes that condition references to be used to allow for reuse of
conditions. Limited to conditions within the same policy. Proposal is
fairly complete and is ready for review and decision.
8. Proposes that rule references to be used to allow for reuse of rules.
May span across policies. This implies that the rule becomes the lowest
administrative unit. This is dependent upon the decision of #19.
Decision of the group is that #19 is not valid since the use case may be
resolved having policies containing single rules.
9. Proposes extended syntax to address hierarchical Subject, Actions and
Resources. Concern is that it is Resource specific and that it may be
able difficult to address the intricacies of any given Resource domain.
It was decided that hierarchical polices and hierarchical requests (new
WI, #42) be split apart for discussion and consideration.
10. Proposes extended syntax for Combining Algorithms to allow for the
influence of rule combination evaluation by parameters of the rules
themselves. There is general agreement on the value of this approach,
however it is not thought to be widely required. Therefore the feeling
is that this should be handled via an extension point added to the
schema. This WI is therefore closed and the topic taken up in #11.
12. Proposes environment attributes for Target. VOTE: approve as
proposed – 8 FOR, 1 Abstain (Daniel, pending discussion of function
extensions). Closed.
16. Determined that this doesn’t introduce anything new to
specification. Closed.
17. Determined that this doesn’t introduce anything new to
specification. Closed.
19. Closed in junction with discussion of #8.
26. Satisfied by existing specification using Policy Combination
Algorithm. Closed.
29. Proposes delegation of policy combination with the constraint that
authorization assertions be passed with requests from remote (trusted)
systems. The scope to the problem is not fully understood by the group
and the proposal was made to pursue administrative policy solutions
first, then return to this issue. Also includes #38 (placing conditions
on members of the delegation chain for operating on policies.)
30. Proposed that policy may be passed with an access request. There is
concern that this will create issues with combinations of other
applicable policies. It has been suggested that there the use case may
be addressed by making remote PAP accessible to local PDP. This
mechanism is related to #29 & #38 and will be discussed in the context
of these issues.
35. Proposes that there is policy specifically developed to cover the
return of missing attributes in decisions with Not Applicable results.
It has been suggested that this is covered by the current specification.
Documentation that details how this may be treated in XACML needs to be
generated.
36. Proposes that PDP have formally defined access control mechanism to
downstream PDPs. This is not consistent with what was generally
understood by the group from the original WI. There is concern that the
scope of this problem is outside of what is practically addressable in
XACML. Further clarification is necessary. This will likely tie into the
discussion of #29, #30 & #38.
37. Proposes a shorthand model for passing multiple elements. Deferred
until tomorrow (rest of group arrives).
38. Covered in #30. Deferred pending outcome of #30.
40. Proposes optimized Policy query in SAML. Two non-conflicting
proposals are on the table. This will be discussed further on the e-mail
list.
+++
F2F Meeting – Oct. 21, 2003 – BEA, San Jose
Attendance:
Frank Siebenlist
Anne Anderson
Tim Moses
Polar Humenn
Daniel Engovatov
Simon Godik
Bill Parducci
Michiharu Kudo
Michael McIntosh
Rebekah Lepro
Hal Lockhart
Steve Anderson
Reviewed the discussions of Monday’s meeting.
Anne provided a historical review of derivation of single attribute
value model in current spec.
(minutes refer to discussion topics by Work Item number)
37. Based on the general belief that this proposal will not affect XPath
attribute queries, the consensus is that this item be approved pending
further clarification (cardinality & descriptive schema changes). Rebeka
will provide a first pass at the changes for the Editor.
Hierarchical authorization issues:
9. Resources – If you want to support request that specify the resource
as a hierarchy (specifically, XML), there must be instance at request.
Wildcards are allowed in hierarchical policies.
42. Requests – hierarchical resource requests MUST use the “scope”
attribute when intentionally requesting resources with subordinate data
members (vs. using /* in an XPath expression). Clarification is required
to define how responses for situations where hierarchical resources
without descendants are queried for descendant access.
Policy Administration:
A number of proposals were discussed, however no clear solution arose as
the majority of the session involved the expression of the requirements.
A higher order requirement proposed by Frank is the ability to evaluate
policies taking into consideration “admin” of the policy to allow for
policy chain decisions.
+++
F2F Meeting – Oct. 22, 2003 – BEA, San Jose
Attendance:
Frank Siebenlist
Anne Anderson
Tim Moses
Polar Humenn
Simon Godik
Bill Parducci
Michael McIntosh
Rebekah Lepro
Hal Lockhart
Steve Anderson
Anthony Nadalin
MaryAnn Hondo
Jacques Durand
Reviewed the discussions of Tuesday’s meeting.
Anne reviewed her Administrative Policy proposal. Frank’s and Polar will
post their respective AP proposals to the mailing list.
Anne & Tim proposed that the XACML TC continue its work on the current
WSPL proposal, focusing on the authorization policy constraints of Web
Services. The premise is that this work adopt/integrate the efforts of
proposed policy advertising committees as (as yet undefined in Oasis &
W3C). Until such time the group would provide examples of how this
mechanism would work; the intent of the group is that this non-normative
output would be replaced/merged with forthcoming standards in this area.
Scope of proposed work:
1. Subset of XACML suitable for describing conditions on access control
related attributes that are: (1). required for accessing a service; (2).
available for a presentation service accessor. NORMATIVE.
2. Combining subset instances from above to determine a mutually
acceptable set of access control related attributes. NORMATIVE.
3. Examples of how such instances are associated with WSDL at message,
operation port type, etc. NON-NORMATIVE.
The group decided that this scope is acceptable and that work will
continue as defined above.
Tim reviewed an approach for LDAP storage of policies to address
many-to-many PDP/PAP relationships. The topic was also raised as to
whether remote policy requests should be considered.
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