Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / AppModel / SiteOfOriginContainer.cs / 1305600 / SiteOfOriginContainer.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // SiteOfOriginContainer is an implementation of the abstract Package class. // It contains nontrivial overrides for GetPartCore and Exists. // Many of the methods on Package are not applicable to loading application // resources, so the SiteOfOriginContainer implementations of these methods throw // the NotSupportedException. // // History: // 06/16/2005: [....] - Initial creation. //----------------------------------------------------------------------------- using System; using System.IO.Packaging; using System.IO; using System.Collections.Generic; using System.Windows.Resources; using System.Resources; using System.Reflection; using System.Globalization; using System.Windows; using System.Windows.Navigation; using System.Deployment.Application; using System.Security; using System.Security.Permissions; using MS.Internal.PresentationCore; namespace MS.Internal.AppModel { ////// SiteOfOriginContainer is an implementation of the abstract Package class. /// It contains nontrivial overrides for GetPartCore and Exists. /// Many of the methods on Package are not applicable to loading files /// so the SiteOfOriginContainer implementations of these methods throw /// the NotSupportedException. /// internal class SiteOfOriginContainer : System.IO.Packaging.Package { //----------------------------------------------------- // // Static Methods // //----------------------------------------------------- #region Static Methods internal static Uri SiteOfOrigin { [FriendAccessAllowed] get { Uri siteOfOrigin = SiteOfOriginForClickOnceApp; if (siteOfOrigin == null) { // Calling FixFileUri because BaseDirectory will be a c:\\ style path siteOfOrigin = BaseUriHelper.FixFileUri(new Uri(System.AppDomain.CurrentDomain.BaseDirectory)); } #if DEBUG if (_traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginContainer: returning site of origin " + siteOfOrigin); #endif return siteOfOrigin; } } // we separated this from the rest of the code because this code is used for media permission // tests in partial trust but we want to do this without hitting the code path for regular exe's // as in the code above. This will get hit for click once apps, xbaps, xaml and xps ////// Critical: sets critical data _siteOfOriginForClickOnceApp. /// TreatAsSafe: the source we set it to is trusted. It is also safe to get the app's site of origin. /// internal static Uri SiteOfOriginForClickOnceApp { [SecurityCritical, SecurityTreatAsSafe, FriendAccessAllowed] get { // The ClickOnce API, ApplicationDeployment.IsNetworkDeployed, determines whether the app is network-deployed // by getting the ApplicationDeployment.CurrentDeployment property and catch the exception it can throw. // The exception is a first chance exception and caught, but it often confuses developers, // and can also have a perf impact. So we change to cache the value of SiteofOrigin in Dev10 to avoid the // exception being thrown too many times. // An alternative is to cache the value of ApplicationDeployment.IsNetworkDeployed. if (_siteOfOriginForClickOnceApp == null) { if (_browserSource.Value != null) { _siteOfOriginForClickOnceApp = new SecurityCriticalDataForSet(_browserSource.Value); } else if (ApplicationDeployment.IsNetworkDeployed) { _siteOfOriginForClickOnceApp = new SecurityCriticalDataForSet (GetDeploymentUri()); } else { _siteOfOriginForClickOnceApp = new SecurityCriticalDataForSet (null); } } Invariant.Assert(_siteOfOriginForClickOnceApp != null); return _siteOfOriginForClickOnceApp.Value.Value; } } /// /// Critical - Whatever is set here will be treated as site of origin. /// internal static Uri BrowserSource { get { return _browserSource.Value; } [SecurityCritical, FriendAccessAllowed] set { _browserSource.Value = value; } } #endregion //------------------------------------------------------ // // Public Constructors // //----------------------------------------------------- #region Public Constructors ////// Default Constructor /// internal SiteOfOriginContainer() : base(FileAccess.Read) { } #endregion //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ // None //----------------------------------------------------- // // Public Methods // //------------------------------------------------------ #region Public Methods ////// public override bool PartExists(Uri uri) { return true; } #endregion //----------------------------------------------------- // // Public Events // //----------------------------------------------------- // None //----------------------------------------------------- // // Internal Constructors // //------------------------------------------------------ // None //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ #region Internal Properties /// /// Critical: sets BooleanSwitch.Enabled which LinkDemands /// TreatAsSafe: ok to enable tracing /// internal static bool TraceSwitchEnabled { get { return _traceSwitch.Enabled; } [SecurityCritical, SecurityTreatAsSafe] set { _traceSwitch.Enabled = value; } } internal static System.Diagnostics.BooleanSwitch _traceSwitch = new System.Diagnostics.BooleanSwitch("SiteOfOrigin", "SiteOfOriginContainer and SiteOfOriginPart trace messages"); #endregion //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- // None //------------------------------------------------------ // // Internal Events // //----------------------------------------------------- // None //----------------------------------------------------- // // Protected Constructors // //----------------------------------------------------- // None //------------------------------------------------------ // // Protected Methods // //----------------------------------------------------- #region Protected Methods ////// This method creates a SiteOfOriginPart which will create a WebRequest /// to access files at the site of origin. /// /// ///protected override PackagePart GetPartCore(Uri uri) { #if DEBUG if (_traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginContainer: Creating SiteOfOriginPart for Uri " + uri); #endif return new SiteOfOriginPart(this, uri); } #endregion //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods /// /// Critical - Performs an elevation to access ApplicationIdentity /// TreatAsSafe - Returns the Uri the .application/.xapp was launched from if the application was network deployed. /// This will not work for a standalone application due to the invariant assert. This information is /// not considered critical because an application is allowed to know where it was deployed from just /// not the local path it is running from. /// This information is also typically available from ApplicationDeployment.CurrentDeployment.ActivationUri /// or ApplicationDeployment.CurrentDeployment.UpdateLocation but those properties are null for applications /// that do not take Uri parameters and do not receive updates from the web. Neither of those properties /// requires an assert to access and are available in partial trust. We are not using them because the need /// for a site of origin is not dependent on update or uri parameters. /// [SecurityCritical, SecurityTreatAsSafe] private static Uri GetDeploymentUri() { Invariant.Assert(ApplicationDeployment.IsNetworkDeployed); AppDomain currentDomain = AppDomain.CurrentDomain; ApplicationIdentity ident = null; string codeBase = null; SecurityPermission p1 = new SecurityPermission(SecurityPermissionFlag.ControlDomainPolicy); p1.Assert(); try { ident = currentDomain.ApplicationIdentity; // ControlDomainPolicy } finally { CodeAccessPermission.RevertAssert(); } SecurityPermission p2 = new SecurityPermission(SecurityPermissionFlag.UnmanagedCode); p2.Assert(); try { codeBase = ident.CodeBase; // Unmanaged Code permission } finally { CodeAccessPermission.RevertAssert(); } return new Uri(new Uri(codeBase), new Uri(".", UriKind.Relative)); } #endregion //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Members private static SecurityCriticalDataForSet_browserSource; private static SecurityCriticalDataForSet ? _siteOfOriginForClickOnceApp; #endregion Private Members //----------------------------------------------------- // // Uninteresting (but required) overrides // //----------------------------------------------------- #region Uninteresting (but required) overrides protected override PackagePart CreatePartCore(Uri uri, string contentType, CompressionOption compressionOption) { return null; } protected override void DeletePartCore(Uri uri) { throw new NotSupportedException(); } protected override PackagePart[] GetPartsCore() { throw new NotSupportedException(); } protected override void FlushCore() { throw new NotSupportedException(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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