PLoP2004_ndelessygassant0_0.doc

Controlaccessurl id credentials contentinspector

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controlAccess(url, id, credentials) ContentInspector PolicyAuthorizationPoint authenticate() grantAccess() log() definePolicy() defineUser() defineRole() removeUser() removeRole() SchemaBase addSchema() removeSchema() updateSchema() XMLSchema Validator HarmfulData Detector checkAccess 1 1 1 XML Firewall requestService * protects XML Encryptor/ Decryptor XML Signer/ Verifier * 1 1 1 1 1 checkData 14
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The ContentInspector consists of a HarmfulDataDetector , a XMLSchemaValidator, a XMLSigner/Verifier , and a XMLEncryptor/Decryptor . The HarmfulDataDetector perform checks for harmful data embedded in the content of the message. The XMLSchemaValidator checks the validity of the XML documents sent to the application. The XMLSigner/Verifier and XMLEncryptor/Decryptor respectively sign/verify, and encrypt/decrypt XML messages that access the Firewall, in accordance with the XML Digital Signature and XML Encryption standards proposed by W3C [W3C]. These mechanisms are used to guarantee confidentiality, data authenticity and integrity of the XML documents, as well as non-repudiation. Dynamics Figure 8 shows the dynamic aspects of the XML Firewall using a sequence diagram. It corresponds to a use case where the XML message is encrypted and signed, and whose user needs to be authenticated. A more basic use case would be obtained by removing some of these calls. Filtering an encrypted and signed Client’s Request, with user authentication: Summary : A Client requests access to a service of an application to either transfer or retrieve information, through an XML message. First, the content of the message is checked so that only harmless messages are given access to the applications. Then, the access request goes through the PolicyEnforcementPoint, which accesses the PolicyAuthorizationPoint to determines whether to accept or deny the request. Actors : External Client Precondition : Existing IdentityBase and PolicyBase must be in place in the firewall. The IdentityDatabase contains the data necessary to authenticate a Client. The PolicyDatabase contains specific policies defined by the organization. An existing XML Schema database contains the XML Schemas trusted by the organization. Description : a. A Client requests access to an application. b. An XML Firewall, through its ContentInspector, checks the validity of the XML message and decrypts it. c. The PolicyEnforcementPoint intercepts the request and relay it to the PolicyAuthorizationPoint 15
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:Client : Policy Enforcement Point : Policy Authorization Point :Application requestService( uri, role, id, credentials) requestService( uri, role, id, credentials) accessService(serviceId) accessService(serviceId) :XML Application Firewall preCheckContent preCheckContent : Content Inspector : XML Schema Validator : Harmful Data Detector validateSchema validateSchema schemaValidated schemaValidated checkData checkData dataChecked dataChecked contentChecked contentChecked : XML Encryptor Decryptor : XML Signer Verifier decrypt decrypt decrypted decrypted verified verified verifySignature verifySignature : Identity Base : Policy
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