Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / TrustUi / MS / Internal / documents / Application / RightsDocument.cs / 1 / RightsDocument.cs
using System.IO; using System.IO.Packaging; using System.Security; using System.Security.RightsManagement; using MS.Internal.Permissions; // For CompoundFileIOPermission namespace MS.Internal.Documents.Application { ////// Extends StreamDocument with EncryptedPackageEnvelope for use by RightsController. /// internal class RightsDocument : StreamDocument{ #region Constructors //-------------------------------------------------------------------------- // Constructors //------------------------------------------------------------------------- /// /// Constructs a FileDocument allowing for a dependency. /// /// The Document this object depends on. internal RightsDocument(Document dependency) : base(dependency) { } #endregion Constructors #region Internal Methods //------------------------------------------------------------------------- // Internal Methods //------------------------------------------------------------------------- ////// Returns true when the destination stream is an encrypted package envelope. /// ////// Critical: /// 1) asserts for CompoundFileIOPermission /// TreatAsSafe: /// 1) data into assert comes from critical for set destination stream /// [SecurityCritical, SecurityTreatAsSafe] internal bool IsDestinationProtected() { if (DestinationPackage != null) { return true; } Stream destinationStream = this.Dependency.Destination; (new CompoundFileIOPermission()).Assert(); // BlessedAssert try { return EncryptedPackageEnvelope.IsEncryptedPackageEnvelope( destinationStream); } finally { CompoundFileIOPermission.RevertAssert(); } } ////// Returns true when the source stream is an encrypted package envelope. /// ////// Critical: /// 1) asserts for CompoundFileIOPermission /// TreatAsSafe: /// 1) data into assert comes from critical for set destination stream /// [SecurityCritical, SecurityTreatAsSafe] internal bool IsSourceProtected() { if (SourcePackage != null) { return true; } Stream sourceStream = this.Dependency.Source; (new CompoundFileIOPermission()).Assert(); // BlessedAssert try { return EncryptedPackageEnvelope.IsEncryptedPackageEnvelope( sourceStream); } finally { CompoundFileIOPermission.RevertAssert(); } } #endregion Internal Methods #region Internal Properties //-------------------------------------------------------------------------- // Internal Properties //------------------------------------------------------------------------- ////// The EncryptedPackageEnvelope used for the destination document. /// This value may be null when the document is not rights protected. /// ////// Critical for set /// 1) property accessor for critical for set object /// internal EncryptedPackageEnvelope DestinationPackage { get { return _destination.Value; } [SecurityCritical] set { _destination.Value = value; } } ////// The EncryptedPackageEnvelope used for the source document. /// This value may be null when the document is not rights protected. /// ////// Critical for set /// 1) property accessor for critical for set object /// internal EncryptedPackageEnvelope SourcePackage { get { return _source.Value; } [SecurityCritical] set { _source.Value = value; } } ////// The EncryptedPackageEnvelope used for the working document. /// This value may be null when the document is not rights protected. /// ////// Critical for set /// 1) property accessor for critical for set object /// internal EncryptedPackageEnvelope WorkspacePackage { get { return _workspace.Value; } [SecurityCritical] set { _workspace.Value = value; } } #endregion Internal Properties #region IDisposable Members //-------------------------------------------------------------------------- // IDisposable Members //-------------------------------------------------------------------------- ////// ////// /// Critical: /// 1) asserts for CompoundFileIOPermission /// 2) sets SourcePackage, DestinationPackage, and WorkspacePackage to null /// TreatAsSafe: /// 1) data into asserts (package objects) are critical for set /// 2) critical for set packages are set to null, which is what should /// happen on dispose /// [SecurityCritical, SecurityTreatAsSafe] protected override void Dispose(bool disposing) { try { if (disposing) { // our base is StreamDocument, as these packages support // the stream we want our base to release them first ReleaseStreams(); // The only code that actually requires this assert are the // calls to Close. Regardless I've put the assert around the // whole block since the rest of the code under it is almost // all just checking packages for null or setting them to null. // This is much cleaner than having three separate asserts (and // three more try/finally blocks) for each Close call. (new CompoundFileIOPermission()).Assert(); //BlessedAssert try { try { if (DestinationPackage != null) { if (DestinationPackage == SourcePackage) { SourcePackage = null; } DestinationPackage.Close(); DestinationPackage = null; } } finally { try { if (WorkspacePackage != null) { WorkspacePackage.Close(); WorkspacePackage = null; } } finally { if (SourcePackage != null) { SourcePackage.Close(); SourcePackage = null; } } } } finally { CompoundFileIOPermission.RevertAssert(); } } } finally { base.Dispose(disposing); } } #endregion IDisposable Members #region Private Fields //------------------------------------------------------------------------- // Private Fields //-------------------------------------------------------------------------- ////// This is critical for set because we assert and perform critical /// operations on the encrypted package envelope. /// private SecurityCriticalDataForSet_source; /// /// This is critical for set because we assert and perform critical /// operations on the encrypted package envelope. /// private SecurityCriticalDataForSet_workspace; /// /// This is critical for set because we assert and perform critical /// operations on the encrypted package envelope. /// private SecurityCriticalDataForSet_destination; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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