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Combining KMIP and XACML

Combining KMIP and XACML. What is XACML?. XML language for access control Coarse or fine-grained Extremely powerful evaluation logic Ability to use any available information Superset of Permissions, ACLs, RBAC, etc Scales from PDA to Internet Federated policy administration

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Combining KMIP and XACML

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  1. Combining KMIP and XACML

  2. What is XACML? • XML language for access control • Coarse or fine-grained • Extremely powerful evaluation logic • Ability to use any available information • Superset of Permissions, ACLs, RBAC, etc • Scales from PDA to Internet • Federated policy administration • OASIS and ITU-T Standard

  3. Key XACML Features • Federated Policy Administration • Multiple policies applicable to same situation • Combining rules to resolve conflicts • Decision may include Obligations • In addition to Permit or Deny • Obligation can specify present or future action • Examples: Log request, require human approval, delete data after 30 days • Protect any resource • Web Server, Java or C++ Object, Room in building, Network Access, Web Service, Geographic Data, Health Records, etc.

  4. XACML Benefits • Standard Policy Language • Investment protection • Skills reuse • Leverage XML tools • Policy not in application code • Reduce cost of changes • Consistent application • Enable audit

  5. Client PDP PDP Administration PDP Decision PDP Resources PEP Enforcement Attribute Repositories Policy Repository Authorities XACML Architecture Application

  6. Policy Evaluation in Brief - 1 • Attribute-based access control (ABAC) • Attributes associated with Subject(s), Action, Resource or Environment • Attributes may represent static (Group) or dynamic (# of accesses) properties • PDP is stateless • Policies contain Boolean expressions • If false, policy is not applicable • If true, Effect (Permit or Deny) is returned

  7. Policy Evaluation in Brief - 2 • Combining Algorithms resolve conflicting policy results • Typical: Deny Overrides • Obligations which are associated with final Effect are also returned • Policies are tree structured to simplify management

  8. Reasons for KMIP Servers to Use XACML • Implement more complex key relationship policies • Dependancies: derived key, wrapped key, split key • Enhance policies to meet Enterprise needs • Other Subject attributes (Roles) • Environmental attributes • Privacy or contractual requirements

  9. What to consider • Not Policy structure (this would be necessary with RBAC for example) • Attributes • What ones may be needed • Where will the come from • How will they get to PDP • Interface • Remote/Local • Protocol/API

  10. Attributes • Datatypes • XACML defines 14 scalar types • KMIP types are a subset • Commonly used are easy, e.g. string • Access • With decision request • KMIP request • Other request, e.g. LDAP • KMIP must maintain dynamic values

  11. Interfaces • PDP may be remote or imbedded • Tradeoff is ease of integration vs. performance • Most KMIP servers relatively low decision volume • Remote call via SOAP defined by XACML • Clearly the easiest to implement • OpenAz open source project is defining APIs • Defining a TTLV remote call is possible

  12. Excellent paper on this subject • Masters thesis by Divay Bansal • IBM / ETH Zurich • http://issuu.com/divaybansal/docs/master-thesis • If nothing else it demonstrates how XACML can implement key-dependancies policies • Alternative architectures

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