author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-43080A86-72D3-5422-953E-A5EF79961D7B" xml:lang="en"><title>Writing |
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a UPS Policy Evaluator</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<section id="GUID-56EDF170-1A32-4275-8799-99D13C485E1E"><title>Introduction</title> <p>Policy Evaluators are ECOM plug-ins. |
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They allow security decisions to be specific to the data on which the service |
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acts instead of simply granting full access to the service, for example "Allow |
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application X to send SMS messages to 01234567". This is supported through |
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the fingerprint functionality. They allow a security decision to be specific |
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to an individual script executing within a scripting host. This is supported |
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through the client entity field. And they allow a prompt to be displayed even |
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if the user selected "Always" or "Never". This could be based on a usage threshold |
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or simply as additional confirmation if the user selected "Never". This is |
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supported through the force prompt functionality. </p> <p> <b>Note</b>: when |
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a user selects “Never” or “Always”, the UPS creates a record in a decision |
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database. This record identifies the system server UID, service UID, client |
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SID, client entity name (name of an entity running within a client process, |
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for example, a script identifier) and a "fingerprint" for a given decision. </p> <p>The |
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purpose of a Policy Evaluator is to allow device creators to optionally customise |
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the behaviour of the UPS at run-time. Policy Evaluators may: </p> <ul> |
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<li id="GUID-1D5DD614-02E3-56AA-A0A6-A694E2311A0E"><p>Allow security decisions |
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to be specific to the data on which the service acts instead of simply granting |
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full access to the service, for example "Allow application X to send SMS messages |
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to 01234567". This is supported via the fingerprint functionality. </p> </li> |
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<li id="GUID-5B5E3EB4-5C93-5E4E-BB6E-39F889AD3610"><p>Allow a security decision |
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to be specific to an individual script executing within a scripting host. |
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This is supported via the client entity field. </p> </li> |
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<li id="GUID-8B26DA57-A9DF-5D99-A259-2E6DF7C4DCCE"><p>Allow a prompt to be |
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displayed even if the user selected "Always" or "Never". This could be based |
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on a usage threshold or simply as additional confirmation if the user selected |
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"Never". This is supported via the force prompt functionality. </p> </li> |
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</ul> </section> |
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<section id="GUID-CCBB139D-0F1C-4AD4-B2F2-062CF660A0DE"><title>Procedure</title> <p>Writing policy evaluator includes the |
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following: </p> <ol id="GUID-F50174F6-3619-545A-8844-D4DA64B1B339"> |
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<li id="GUID-246EF2AB-23D9-5B1B-BC4C-8CCFB545C307"><p>Generating fingerprints </p> </li> |
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<li id="GUID-4427FF70-9461-566A-8567-FC6EEF879475"><p>Forcing prompts </p> </li> |
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<li id="GUID-703D9B83-78A0-5EA6-8D1C-685D2BC847EA"><p>Defining default policy |
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evaluator </p> </li> |
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</ol> <p>Policy evaluators implement the <codeph>CPolicyEvaluator</codeph> interface. </p> <p><b>Generating |
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fingerprints</b> </p> <p>The key task of the policy evaluator is to generate |
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fingerprints. A fingerprint is a collection of data describing the service |
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being requested. The fingerprint usually includes the <codeph>destination</codeph> string, |
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for example a telephone number, supplied by the service that is matched to |
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the <codeph>destination</codeph> string of a policy in the policy file. </p> <p>The |
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policy evaluator must implement the <codeph>GenerateFingerprints()</codeph> function, |
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which is a pure virtual function, declared in the <xref href="GUID-FDE91CAC-1588-3EED-B509-08168F4B881B.dita"><apiname>CPolicyEvaluator</apiname></xref> base |
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class. The function is asynchronous to allow the implementation to call other |
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server processes. </p> <p>The following table describes the parameters for |
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the <codeph>GenerateFingerprints()</codeph> function: </p> <table id="GUID-963D89B8-EB90-5668-8A08-588EF1E94C43"> |
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<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/> |
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<thead> |
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<row> |
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<entry>Parameter</entry> |
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<entry>Description</entry> |
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</row> |
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</thead> |
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<tbody> |
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<row> |
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<entry><p> <codeph>aRequest</codeph> </p> </entry> |
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<entry><p>Data that the system server provides to the UPS, including the ClientSid, |
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ServerSid and ServiceId. </p> </entry> |
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</row> |
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<entry><p> <codeph>aPolicy</codeph> </p> </entry> |
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<entry><p>Details of the policy for the service. </p> </entry> |
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</row> |
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<row> |
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<entry><p> <codeph>aFingerprints</codeph> </p> </entry> |
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<entry><p>Array of fingerprints. </p> </entry> |
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<entry><p> <codeph>aClientEntity</codeph> </p> </entry> |
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<entry><p>Details of client entity (will be null if the client process is |
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not an execution host or the policy evaluator does not support client entities). </p> </entry> |
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</row> |
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<row> |
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<entry><p> <codeph>aDialogCreatorParams</codeph> </p> </entry> |
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<entry><p>Opaque data, which can be any other information for use in the fingerprint |
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or to be displayed in the dialog. </p> </entry> |
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</row> |
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<entry><p> <codeph>aStatus</codeph> </p> </entry> |
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<entry><p>The request status used to contain completion information for the |
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function. </p> </entry> |
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</row> |
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</tbody> |
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</tgroup> |
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</table> <p>The following code fragment is a sample implementation of the <codeph>GenerateFingerprints()</codeph> function. </p> <codeblock id="GUID-B8555FDF-8BDD-5D22-AA20-AA9A4B35148A" xml:space="preserve">void CRefPolicyEvaluator::GenerateFingerprints( |
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const CPromptRequest& aRequest, const CPolicy& aPolicy, |
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RPointerArray<CFingerprint>& aFingerprints, const CClientEntity*& aClientEntity, |
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const TAny*& aDialogCreatorParams, TRequestStatus& aStatus) |
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{ |
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iRequest = &aRequest; |
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iPolicy = &aPolicy; |
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iFingerprints = &aFingerprints; |
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// This OUT parameter *could* be set to point to data structure |
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// owned by this policy evaluator that is read by the dialog-creator. |
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aDialogCreatorParams = 0; |
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|
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// The client entity field only needs to be set if the policy evaluator |
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// is designed to identify scripts/non-native applications being executed |
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// by the client application. |
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aClientEntity = 0; |
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iClientStatus = &aStatus; |
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aStatus = KRequestPending; |
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// Kick off policy evaluator state machine |
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iStatus = KRequestPending; |
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TRequestStatus* status = &iStatus; |
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SetActive(); |
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User::RequestComplete(status, KErrNone); |
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} |
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</codeblock> <p> <codeph>RunL()</codeph> is called when the request completes. |
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The fingerprint is created and appended to the fingerprint array in <codeph>RunL()</codeph>. |
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The following example shows a hash of a destination being created for a fingerprint |
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as well as an empty fingerprint for decisions that apply to all destinations. </p> <codeblock id="GUID-EB57F6E0-C3B2-5CDC-B9FF-A570B73B4C74" xml:space="preserve">void CRefPolicyEvaluator::RunL() |
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{ |
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// Create most specific hash first i.e. HASH(destination) |
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// Information from the opaque data supplied by the system server |
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// may also be used. |
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// N.B. The UPS does not require the fingerprint to be a hash. However, |
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// the fingerprint is limited to 32 bytes. |
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iDigest->Reset(); |
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const TDesC& d = iRequest->Destination(); |
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TPtrC8 p(reinterpret_cast<const TUint8*>(d.Ptr()), d.Length() * 2); |
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TPtrC8 h(iDigest->Hash(p)); |
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CFingerprint* f = CFingerprint::NewLC(h, d); |
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iFingerprints->AppendL(f); |
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CleanupStack::Pop(f); |
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// An empty fingerprint may be used for decisions that apply to |
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// all destinations. |
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f = CFingerprint::NewLC(KNullDesC8, KNullDesC); |
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iFingerprints->AppendL(f); |
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CleanupStack::Pop(f); |
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User::RequestComplete(iClientStatus, KErrNone); |
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} |
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</codeblock> <p><b>Forcing prompts</b> </p> <p>You can implement the <codeph>ForcePromptL()</codeph> function |
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to force a prompt, even if the UPS has found a persistent decision for the |
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request in the decision database. It may be desirable to force a prompt in |
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some cases such as: </p> <ul> |
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<li id="GUID-4C9DDFB3-C358-534F-8E65-42E1BC672D64"><p>if a threshold has been |
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reached, for example the number of MMS messages sent on a particular day </p> </li> |
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<li id="GUID-5D5E02E5-DA19-5A30-8071-CD64631FBEAD"><p>if a phone user has |
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selected "Never", because denying a request to a non-UPS-aware application |
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may cause it to fail — the user may not realise that the previous selection |
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of "Never" has caused the failure or may not know how to find the management |
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application to revert the decision </p> </li> |
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</ul> <p>The UPS invokes the <codeph>ForcePromptL()</codeph> function after |
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a matching record is found in the database. The <codeph>ForcePromptL()</codeph> function |
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is defined in the <codeph>CPolicyEvaluator</codeph> base class. The implementation |
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in the base class always returns <codeph>EFalse</codeph>. To force a prompt, |
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device creators need to override this function and return <codeph>ETrue</codeph>. |
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A sample implementation is as follows. The <codeph>aNewEvaluatorInfo</codeph> field |
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is a policy evaluator defined 32-bit field. It could be used to store usage |
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thresholds or as a flag that indicates that the prompt has already been forced. </p> <codeblock id="GUID-4E60DCA5-7F25-5FC7-B173-05E1A15FCEE6" xml:space="preserve">TBool CRefPolicyEvaluator::ForcePromptL(const CDecisionRecord& aDecision, TUint& aNewEvaluatorInfo) |
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{ |
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// In this example, if the user selects Never, then they are prompted |
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// once more in-case they did not intend to select Never. |
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// The "Evaluator Info" field is used to ensure the prompt is only forced once. |
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// |
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// The base class implementation (CPolicyEvaluator::ForcePromptL) |
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// always returns EFalse. |
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aNewEvaluatorInfo = 1; |
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return (aDecision.iResult == 0 && aDecision.iEvaluatorInfo == 0); |
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} |
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</codeblock> <p><b>Defining default policy evaluator</b> </p> <p>If device |
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creators do not define a policy evaluator, a default (internal) policy evaluator |
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is returned. The default policy evaluator returns a single, null fingerprint. |
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The default policy evaluator does not override the <codeph>ForcePromptL()</codeph> API. </p> </section> |
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<section id="GUID-987ECDA9-5728-4A7A-AB38-D58A7CC097AC"><title> Upgrading policy evaluators </title> <p>A policy evaluator |
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can be overwritten or eclipsed without restarting the UPS, if it is delivered |
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through an appropriately signed upgrade. </p> <ul> |
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<li id="GUID-086FABB6-13C0-5D98-8B2A-1D38BD620EB5"><p>The ECOM plug-in will |
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be reloaded only when there are no active <codeph>RUpsSubsession::Authorise()</codeph> requests. </p> </li> |
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<li id="GUID-CD95EB32-9438-5AA1-BA80-8C90DC304642"><p>The decision records |
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are not deleted if the policy evaluator is changed. If the policy evaluator |
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is not backwards compatible then new policy files with a new <codeph>majorversion</codeph> number |
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should be delivered. </p> </li> |
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<li id="GUID-DC1804B8-A052-52AC-96DC-32C3BBADE2A8"><p>SWI Observer informs |
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the UPS that the plug-ins may have changed whenever Software Install modifies <filepath>sys\bin</filepath> on |
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the system drive. There is no need to explicitly register changes to plug-ins. </p> </li> |
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</ul> </section> |
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<section id="GUID-48624948-C1C9-4DEA-A6E1-6E4B9AC72E8E"><title> Policy evaluator example</title> <p>The following code shows |
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an example of a full implementation of the policy evaluator file: </p> <codeblock id="GUID-D1615A8D-334C-5718-BFD6-EC3004A09F3A" xml:space="preserve">#include "refpolicyevaluator.h" |
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#include <ecom/implementationproxy.h> |
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#include <ups/cliententity.h> |
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#include <ups/fingerprint.h> |
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#include <ups/upsdb.h> |
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using namespace UserPromptService; |
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static const TUint KRefPolicyEvaluatorImplementationId = 0x10285814; |
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CPolicyEvaluator* CRefPolicyEvaluator::CreatePolicyEvaluatorL() |
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/** |
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Factory method that instantiates a new policy evaluator ECOM plug-in. |
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@return A pointer to the new reference policy evaluator object. |
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*/ |
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{ |
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CRefPolicyEvaluator* self = new (ELeave)CRefPolicyEvaluator(); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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CleanupStack::Pop(self); |
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return self; |
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} |
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static const TImplementationProxy ImplementationTable[] = |
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{ |
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IMPLEMENTATION_PROXY_ENTRY(KRefPolicyEvaluatorImplementationId, CRefPolicyEvaluator::CreatePolicyEvaluatorL) |
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}; |
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EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount) |
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/** |
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Standard ECOM factory |
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*/ |
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{ |
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aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy); |
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return ImplementationTable; |
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} |
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CRefPolicyEvaluator::CRefPolicyEvaluator() |
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/** |
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Constructor |
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*/ |
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: CPolicyEvaluator() |
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{ |
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CActiveScheduler::Add(this); |
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} |
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CRefPolicyEvaluator::~CRefPolicyEvaluator() |
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/** |
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Destructor |
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*/ |
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{ |
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Deque(); |
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delete iDigest; |
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} |
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void CRefPolicyEvaluator::ConstructL() |
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/** |
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Second phase constructor, creates the message digest |
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*/ |
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{ |
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iDigest = CMessageDigestFactory::NewDigestL(CMessageDigest::EMD5); |
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} |
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// From CActive |
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void CRefPolicyEvaluator::DoCancel() |
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{ |
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// Logically should Cancel the internal outstanding requst, but |
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// currently GenerateFingerprints has already completed it. |
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// And need to complete the clients request |
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if (iClientStatus) |
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{ |
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User::RequestComplete(iClientStatus, KErrCancel); |
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} |
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} |
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TInt CRefPolicyEvaluator::RunError(TInt aError) |
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{ |
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if (iClientStatus) |
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{ |
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User::RequestComplete(iClientStatus, aError); |
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} |
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return KErrNone; |
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} |
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void CRefPolicyEvaluator::RunL() |
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{ |
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// Create most specific hash first i.e. HASH(destination) |
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// Information from the opaque data supplied by the system server |
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// may also be used. |
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// N.B. The UPS does not require the fingerprint to be a hash. However, |
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// the fingerprint is limited to 32 bytes. |
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iDigest->Reset(); |
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const TDesC& d = iRequest->Destination(); |
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TPtrC8 p(reinterpret_cast<const TUint8*>(d.Ptr()), d.Length() * 2); |
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TPtrC8 h(iDigest->Hash(p)); |
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CFingerprint* f = CFingerprint::NewLC(h, d); |
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iFingerprints->AppendL(f); |
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CleanupStack::Pop(f); |
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// An empty fingerprint may be used for decisions that apply to |
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// all destinations. |
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f = CFingerprint::NewLC(KNullDesC8, KNullDesC); |
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iFingerprints->AppendL(f); |
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CleanupStack::Pop(f); |
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User::RequestComplete(iClientStatus, KErrNone); |
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} |
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void CRefPolicyEvaluator::GenerateFingerprints( |
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const CPromptRequest& aRequest, const CPolicy& aPolicy, |
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RPointerArray<CFingerprint>& aFingerprints, const CClientEntity*& aClientEntity, |
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const TAny*& aDialogCreatorParams, TRequestStatus& aStatus) |
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{ |
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iRequest = &aRequest; |
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iPolicy = &aPolicy; |
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iFingerprints = &aFingerprints; |
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// This OUT parameter *could* be set to point to data structure |
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// owned by this policy evaluator that is read by the dialog-creator. |
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aDialogCreatorParams = 0; |
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// The client entity field only needs to be set if the policy evaluator |
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// is designed to identify scripts/non-native applications being executed |
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// by the client application. |
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aClientEntity = 0; |
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iClientStatus = &aStatus; |
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aStatus = KRequestPending; |
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// Kick off policy evaluator state machine |
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iStatus = KRequestPending; |
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TRequestStatus* status = &iStatus; |
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SetActive(); |
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User::RequestComplete(status, KErrNone); |
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} |
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TBool CRefPolicyEvaluator::ForcePromptL(const CDecisionRecord& aDecision, TUint& aNewEvaluatorInfo) |
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{ |
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// In this example, if the user selects Never, then they are prompted |
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// once more in-case they did not intend to select Never. |
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// The "Evaluator Info" field is used to ensure the prompt is only forced once. |
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// |
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// The base class implementation (CPolicyEvaluator::ForcePromptL) |
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// always returns EFalse. |
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aNewEvaluatorInfo = 1; |
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return (aDecision.iResult == 0 && aDecision.iEvaluatorInfo == 0); |
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} |
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349 |
</codeblock> </section> |
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</conbody></concept> |