1 Secure Distributed Objects for Grid Applications Laurent Baduel, Arnaud Contes, Denis Caromel...

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Secure Distributed Objects for Grid Applications

Laurent Baduel, Arnaud Contes, Denis Caromel

OASIS team http://www.inria.fr/oasis

ProActive http://proactive.objectweb.org

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Outline

Context• ProActive overview

• Abstract Deployment model

Security Model• Security Entities

• Security Policies

• Example

Conclusion

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The ProActive Middleware

A Java API + Tools for Parallel & Distributed Computing

A uniform framework : Active Object (AO) pattern • one thread, owns passive objects, remotely accessible

Programming model : • groups, mobility, components, security

A formal model• Determinism, Insensitivity to deployment

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Deployment Model

Virtual Nodes : • Identified as a string name, used in program source, configured

(mapped) in an XML descriptor file

2 distinct steps :

Development Source Code

Deployment

XML Descriptor Active Objets VN VN Runtimes (JVMs) Hosts

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A ProActive Application

Virtual Node 1

Virtual Node 2

Virtual Node 3

Active objectPassive object

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Multiple Deployment Issues

One Host Cluster Grid

Different Deployments Different Security Policies

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Issues & Goals

Authentication of Computers, Users, and Applications

Creation, connection to, and monitoring of activities

Authentication, Integrity and Confidentiality (AIC) of communications

Several levels of security policies: users, resource providers, administrators

Main objective : Facilitate the use and the management of security features by removing them from the source code

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Outline

Context• ProActive overview

• Abstract Deployment model

Security Model• Security Entities


• Example

Conclusion

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Security Entity Model

Generic definition, composed of a security manager and a protected object

Subject of security policies

Transparent for the protected object (meta object protocol)

No supposition on the protected object (runtimes, nodes, active objects, …)

Hierarchical structure

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Security Manager:

• Entity ID


• Session Manager

Negotiation protocol

Security Manager:

• Entity ID


• Session Manager Normal

communications

Secured communications

Security Entities

ProtectedObject

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Application Authentication

User certificate

Application certificate

Certificate chaincertificates for active objects, nodes

SPKI :

• Certificate chain

• No Certificate Authority

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Hierarchical Security Policies

Dn

Accept Deny

Runtime

Accept Deny

D0

Accept Deny

VN

Accept DenyAO

Accept Deny

Final Security policy

Administrator policy

Application-level policy

Security policy is defined according all matching rules from:

• Domains / Runtime

• Virtual Node

• Active Object

Resource provider policy

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Security Rule

Interactions:• JVMCreation

• NodeCreation

• CodeLoading

• ObjectCreation

• ObjectMigration

• Request

• Reply

• Listing

Entities:

• Domain

• User

• Virtual Node

• Object

Entities -> Entities : Interactions # Security Attributes

Attributes:• Authentication

• Integrity

• Confidentiality

Each attribute can be:• Allowed

• Optional

• Disallowed

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Descriptor Security Model

A key principle:

• Specify security policies in the XML deployment, NOT IN SOURCE CODE !

In program source: • Virtual Node (VN, a string name)

In XML descriptors:• List of policy rules between virtual nodes, runtimes, domains,

…

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Security Example

2 domains GridA & GridB with security policies• Domain [GridA] -> Domain [GridB] : Q,P,M # [+A,+I,+C]

• Domain [GridB] -> Domain [GridA] : Q,P,M # [+A,+I,+C]

Application : • 2 Virtual Nodes (vn1,vn2)

• 2 Active objects

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Descriptor with SecurityVirtualNodes: vn1, vn2

SECURITY:

VN [vn1] -> VN [vn2] : Q,P # [?A,?I,?C]

VN [vn1] -> VN [vn2] : M # Forbidden

VN [vn2] -> VN [vn1] : Q,P # [?A,?I,?C]

VN [vn2] -> VN [vn1] : M # Forbidden

Domain [GridA] -> Domain [GridB] : Q,P,M # [+A,+I,+C]

Domain [GridB] -> Domain [GridA] : Q,P,M # [+A,+I,+C]Mapping:

vn1 --> GridAComputers, GridBComputers

vn2 --> GridAComputers

JVMs:

/…/

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Example: std. code, no security/…/proActiveDescriptor.activateMappings();vn1 = proActiveDescriptor.getVirtualNode("vn1");vn2 = proActiveDescriptor.getVirtualNode("vn2");/…/Flower rose = (Flower) ProActive.newActive(Flower.class,new Object[]{« Rose »}, vn1.getNode()};Flower daliah = (Flower) ProActive.newActive(Flower.class,new Object[]{« Daliah »}, vn2.getNode()};/* next VN1 node inside the same domain */rose.migrateTo(vn1);/* communication inside the same domain */rose.sayHelloTo(daliah);/* next VN1 Node, other domain */rose.migrateTo(vn1);/* communication with another domain */rose.sayHelloTo(daliah);/* other virtual node, forbidden */rose.migrateTo(vn2);

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Example

Domain GridA Domain GridB

VN1VN2

Policy rules database Runtime

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Example


VN1VN2

Policy rules database

Runtime

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Example


Rose

Daliah

VN1VN2


Runtime

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Example


Rose

Daliah

VN1VN2


Migration : - same VN - same domain

Runtime

Can I migrate to the next VN1 node ?

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Example


Daliah

VN1VN2



Runtime

1 - Retrieve VN policy2 - migration allowed

Rose

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Example


Rose

Daliah

VN1VN2



Runtime

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Example


Rose

Daliah

VN1VN2



Runtime

Negotiated Policy:Rose -> Daliah : [?A,?I,?C]

Perform a method callRose -> Daliah : [?A,?I,?C]

Receive a method call : Daliah -> Rose : [?A,?I,?C]

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Example


Rose

Daliah

VN1VN2Policy rules

database


Runtime

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Example


Rose

Daliah

VN1VN2


Migration : - same VN - other domain

Runtime

Can I migrate to the next VN1 node on

GridB domain?

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Example


Daliah

VN1VN2



Rose

Runtime

1- VN1 policy -> none2- GridA -> GridB : [+A,+I,+C] 3- migration with [+A,+I,+C]

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Example


Rose

Daliah

VN1VN2



Runtime

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Example


Daliah

VN1VN2


Method call : - other VN - other domainFrom Rose --> Daliah

Rose

Runtime

Negotiated Policy:Rose -> Daliah : [+A,+I,+C]

Perform a method callRose -> Daliah : [+A,+I,+C]

Receive a method call : Daliah -> Rose : [+A,+I,+C]

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Example


Daliah

VN1VN2


Migration : - other VN From Rose --> Daliah

Rose

Runtime

Migration to VN2 ?VN1 -> VN2 : [-M]

NO !

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Conclusion

Transparent to application

Take care of a hierarchy of security policies

Security can be adapted to application deployment

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Thank you for your time

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