Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / PermissionSetTriple.cs / 4 / PermissionSetTriple.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================================== ** ** Class: PermissionSetTriple ** ** Purpose: Container class for holding an AppDomain's Grantset and Refused sets. ** Also used for CompressedStacks which brings in the third PermissionSet. ** Hence, the name PermissionSetTriple. ** =============================================================================*/ namespace System.Security { using IEnumerator = System.Collections.IEnumerator; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; [Serializable()] sealed internal class PermissionSetTriple { unsafe static private RuntimeMethodHandle s_emptyRMH = new RuntimeMethodHandle(null); static private PermissionToken s_zoneToken; static private PermissionToken s_urlToken; internal PermissionSet AssertSet; internal PermissionSet GrantSet; internal PermissionSet RefusedSet; internal PermissionSetTriple() { Reset(); } internal PermissionSetTriple(PermissionSetTriple triple) { this.AssertSet = triple.AssertSet; this.GrantSet = triple.GrantSet; this.RefusedSet = triple.RefusedSet; } internal void Reset() { AssertSet = null; GrantSet = null; RefusedSet = null; } internal bool IsEmpty() { return (AssertSet == null && GrantSet == null && RefusedSet == null); } private PermissionToken ZoneToken { get { if (s_zoneToken == null) s_zoneToken = PermissionToken.GetToken(typeof(ZoneIdentityPermission)); return s_zoneToken; } } private PermissionToken UrlToken { get { if (s_urlToken == null) s_urlToken = PermissionToken.GetToken(typeof(UrlIdentityPermission)); return s_urlToken; } } internal bool Update(PermissionSetTriple psTriple, out PermissionSetTriple retTriple) { retTriple = null; // Special case: unrestricted assertt. Note: dcs.Assert.IsUnrestricted => dcs.Grant.IsUnrestricted if (psTriple.AssertSet != null && psTriple.AssertSet.IsUnrestricted()) { return true; // stop construction } retTriple = UpdateAssert(psTriple.AssertSet); UpdateGrant(psTriple.GrantSet); UpdateRefused(psTriple.RefusedSet); return false; } internal PermissionSetTriple UpdateAssert(PermissionSet in_a) { PermissionSetTriple retTriple = null; if (in_a != null) { BCLDebug.Assert((!in_a.IsUnrestricted()), "Cannot be unrestricted here"); // if we're already assertting in_a, nothing to do if (in_a.IsSubsetOf(AssertSet)) return null; PermissionSet retPs; if (GrantSet != null) retPs = in_a.Intersect(GrantSet); // Restrict the assertt to what we've already been granted else { GrantSet = new PermissionSet(true); retPs = in_a.Copy(); // Currently unrestricted Grant: assertt the whole assertt set } bool bFailedToCompress; // removes anything that is already in the refused set from the assertt set retPs = PermissionSet.RemoveRefusedPermissionSet(retPs, RefusedSet, out bFailedToCompress); if (!bFailedToCompress) bFailedToCompress = PermissionSet.IsIntersectingAssertedPermissions(retPs, AssertSet); if (bFailedToCompress) { retTriple = new PermissionSetTriple(this); this.Reset(); this.GrantSet = retTriple.GrantSet.Copy(); } if (AssertSet == null) AssertSet = retPs; else AssertSet.InplaceUnion(retPs); } return retTriple; } internal void UpdateGrant(PermissionSet in_g, out ZoneIdentityPermission z,out UrlIdentityPermission u) { z = null; u = null; if (in_g != null) { if (GrantSet == null) GrantSet = in_g.Copy(); else GrantSet.InplaceIntersect(in_g); z = (ZoneIdentityPermission)in_g.GetPermission(ZoneToken); u = (UrlIdentityPermission)in_g.GetPermission(UrlToken); } } internal void UpdateGrant(PermissionSet in_g) { if (in_g != null) { if (GrantSet == null) GrantSet = in_g.Copy(); else GrantSet.InplaceIntersect(in_g); } } internal void UpdateRefused(PermissionSet in_r) { if (in_r != null) { if (RefusedSet == null) RefusedSet = in_r.Copy(); else RefusedSet.InplaceUnion(in_r); } } static bool CheckAssert(PermissionSet pSet, CodeAccessPermission demand, PermissionToken permToken) { if (pSet != null) { pSet.CheckDecoded(demand, permToken); CodeAccessPermission perm = (CodeAccessPermission)pSet.GetPermission(demand); // If the assertt set does contain the demanded permission, halt the stackwalk try { if ((pSet.IsUnrestricted() && demand.CanUnrestrictedOverride()) || demand.CheckAssert(perm)) { return SecurityRuntime.StackHalt; } } catch (ArgumentException) { } } return SecurityRuntime.StackContinue; } static bool CheckAssert(PermissionSet asserttPset, PermissionSet demandSet, out PermissionSet newDemandSet) { newDemandSet = null; if (asserttPset!= null) { asserttPset.CheckDecoded(demandSet); // If this frame assertts a superset of the demand set we're done if (demandSet.CheckAssertion(asserttPset)) return SecurityRuntime.StackHalt; PermissionSet.RemoveAssertedPermissionSet(demandSet, asserttPset, out newDemandSet); } return SecurityRuntime.StackContinue; } internal bool CheckDemand(CodeAccessPermission demand, PermissionToken permToken, RuntimeMethodHandle rmh) { if (CheckAssert(AssertSet, demand, permToken) == SecurityRuntime.StackHalt) return SecurityRuntime.StackHalt; CodeAccessSecurityEngine.CheckHelper(GrantSet, RefusedSet, demand, permToken, rmh, null, SecurityAction.Demand, true); return SecurityRuntime.StackContinue; } internal bool CheckSetDemand(PermissionSet demandSet , out PermissionSet alteredDemandset, RuntimeMethodHandle rmh) { alteredDemandset = null; if (CheckAssert(AssertSet, demandSet, out alteredDemandset) == SecurityRuntime.StackHalt) return SecurityRuntime.StackHalt; if (alteredDemandset != null) demandSet = alteredDemandset; // CodeAccessSecurityEngine.CheckSetHelper(GrantSet, RefusedSet, demandSet, rmh, null, SecurityAction.Demand, true); return SecurityRuntime.StackContinue; } internal bool CheckDemandNoThrow(CodeAccessPermission demand, PermissionToken permToken) { BCLDebug.Assert(AssertSet == null, "AssertSet not null"); return CodeAccessSecurityEngine.CheckHelper(GrantSet, RefusedSet, demand, permToken, s_emptyRMH, null, SecurityAction.Demand, false); } internal bool CheckSetDemandNoThrow(PermissionSet demandSet) { BCLDebug.Assert(AssertSet == null, "AssertSet not null"); return CodeAccessSecurityEngine.CheckSetHelper(GrantSet, RefusedSet, demandSet, s_emptyRMH, null, SecurityAction.Demand, false); } ////// Check to see if the triple satisfies a demand for the permission represented by the flag. /// ////// If the triple assertts for one of the bits in the flags, it is zeroed out. /// /// set of flags to internal bool CheckFlags(ref int flags) { if (AssertSet != null) { // remove any permissions which were assertted for int asserttFlags = SecurityManager.GetSpecialFlags(AssertSet, null); if ((flags & asserttFlags) != 0) flags = flags & ~asserttFlags; } return (SecurityManager.GetSpecialFlags(GrantSet, RefusedSet) & flags) == flags; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Style.cs
- ValueProviderWrapper.cs
- DependencyObject.cs
- ApplicationHost.cs
- ResourceWriter.cs
- ToolStripButton.cs
- AutomationProperty.cs
- PointCollection.cs
- WebConfigurationHost.cs
- OneOfScalarConst.cs
- ClientSection.cs
- ConfigurationStrings.cs
- TdsEnums.cs
- DataGridViewColumn.cs
- ViewCellSlot.cs
- SqlAliasesReferenced.cs
- ObjectTypeMapping.cs
- HtmlButton.cs
- GridViewRowCollection.cs
- TraceHwndHost.cs
- Aggregates.cs
- SurrogateEncoder.cs
- Lasso.cs
- GeneralTransformGroup.cs
- ScalarConstant.cs
- SizeAnimationClockResource.cs
- DropShadowBitmapEffect.cs
- LinkedList.cs
- HtmlElementEventArgs.cs
- DesignerCalendarAdapter.cs
- FileSystemWatcher.cs
- DomNameTable.cs
- WebErrorHandler.cs
- CollectionView.cs
- EventLogEntry.cs
- ClientEventManager.cs
- PrintPreviewDialog.cs
- DynamicMethod.cs
- ClassDataContract.cs
- TextBoxAutomationPeer.cs
- MethodToken.cs
- mongolianshape.cs
- PropertyMapper.cs
- Property.cs
- AsyncPostBackErrorEventArgs.cs
- IntSecurity.cs
- NameValueFileSectionHandler.cs
- StorageRoot.cs
- DynamicILGenerator.cs
- _ListenerAsyncResult.cs
- DataTableTypeConverter.cs
- NativeCppClassAttribute.cs
- Int32Rect.cs
- InternalSafeNativeMethods.cs
- RoleService.cs
- ColorBuilder.cs
- XhtmlTextWriter.cs
- MulticastNotSupportedException.cs
- AssertFilter.cs
- XmlDocumentFieldSchema.cs
- IERequestCache.cs
- ListBoxAutomationPeer.cs
- messageonlyhwndwrapper.cs
- SmiXetterAccessMap.cs
- SchemaMerger.cs
- WebUtil.cs
- PathFigure.cs
- Exceptions.cs
- InstalledVoice.cs
- StyleXamlTreeBuilder.cs
- Decoder.cs
- ISO2022Encoding.cs
- ArraySubsetEnumerator.cs
- TemplateContentLoader.cs
- XPathSelfQuery.cs
- StorageBasedPackageProperties.cs
- ProtocolsSection.cs
- RequestCacheEntry.cs
- HtmlInputImage.cs
- TypeSystem.cs
- ObjectDataSourceChooseMethodsPanel.cs
- ExpressionBuilderContext.cs
- PeerInputChannel.cs
- Stacktrace.cs
- CodeMemberEvent.cs
- File.cs
- DocumentViewerHelper.cs
- HttpClientCertificate.cs
- MatrixTransform.cs
- NavigationPropertyEmitter.cs
- WindowPattern.cs
- ThemeableAttribute.cs
- ObjectContext.cs
- SystemDiagnosticsSection.cs
- DbConnectionPool.cs
- TagNameToTypeMapper.cs
- AmbientLight.cs
- Permission.cs
- VirtualDirectoryMapping.cs
- ListBindableAttribute.cs