Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / SecurityUtils.cs / 1 / SecurityUtils.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ #if WINFORMS_NAMESPACE namespace System.Windows.Forms #elif DRAWING_NAMESPACE namespace System.Drawing #elif WINFORMS_PUBLIC_GRAPHICS_LIBRARY namespace System.Internal #elif SYSTEM_NAMESPACE namespace System #else namespace System.Windows.Forms #endif { using System; using System.Reflection; using System.Diagnostics.CodeAnalysis; using System.Security; using System.Security.Permissions; ////// Useful methods to securely call 'dangerous' managed APIs (especially reflection). /// See http://wiki/default.aspx/Microsoft.Projects.DotNetClient.SecurityConcernsAroundReflection /// for more information specifically about why we need to be careful about reflection invocations. /// internal static class SecurityUtils { private static bool HasReflectionPermission { get { try { (new ReflectionPermission(PermissionState.Unrestricted)).Demand(); return true; } catch (SecurityException) { } return false; } } ////// This helper method provides safe access to Activator.CreateInstance. /// NOTE: This overload will work only with public .ctors. /// internal static object SecureCreateInstance(Type type) { return SecureCreateInstance(type, null); } ////// This helper method provides safe access to Activator.CreateInstance. /// NOTE: This overload will work only with public .ctors. /// internal static object SecureCreateInstance(Type type, object[] args) { if (type == null) { throw new ArgumentNullException("type"); } // The only case we need to worry about is when the type is in the same assembly // as us. In all other cases, reflection will take care of security. if (type.Assembly == typeof(SecurityUtils).Assembly && !(type.IsPublic || type.IsNestedPublic)) { (new ReflectionPermission(PermissionState.Unrestricted)).Demand(); } return Activator.CreateInstance(type, args); } ////// This helper method provides safe access to Activator.CreateInstance. /// Set allowNonPublic to true if you want non public ctors to be used. /// internal static object SecureCreateInstance(Type type, object[] args, bool allowNonPublic) { if (type == null) { throw new ArgumentNullException("type"); } BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.CreateInstance; // The only case we need to worry about is when the type is in the same assembly // as us. In all other cases, reflection will take care of security. if (type.Assembly == typeof(SecurityUtils).Assembly) { // if it's an internal type, we demand reflection permission. if (!(type.IsPublic || type.IsNestedPublic)) { (new ReflectionPermission(PermissionState.Unrestricted)).Demand(); } else if (allowNonPublic && !HasReflectionPermission) { // Someone is trying to instantiate a public type in *our* assembly, but does not // have full reflection permission. We shouldn't pass BindingFlags.NonPublic in this case. // The reason we don't directly demand the permission here is because we don't know whether // a public nr non-public .ctor will be invoked. We want to allow the public .ctor case to // succeed. allowNonPublic = false; } } if (allowNonPublic) { flags |= BindingFlags.NonPublic; } return Activator.CreateInstance(type, flags, null, args, null); } ////// Helper method to safely invoke a .ctor. You should prefer SecureCreateInstance to this. /// Set allowNonPublic to true if you want non public ctors to be used. /// internal static object SecureConstructorInvoke(Type type, Type[] argTypes, object[] args, bool allowNonPublic) { return SecureConstructorInvoke(type, argTypes, args, allowNonPublic, BindingFlags.Default); } ////// Helper method to safely invoke a .ctor. You should prefer SecureCreateInstance to this. /// Set allowNonPublic to true if you want non public ctors to be used. /// The 'extraFlags' parameter is used to pass in any other flags you need, /// besides Public, NonPublic and Instance. /// internal static object SecureConstructorInvoke(Type type, Type[] argTypes, object[] args, bool allowNonPublic, BindingFlags extraFlags) { if (type == null) { throw new ArgumentNullException("type"); } BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | extraFlags; // The only case we need to worry about is when the type is in the same assembly // as us. In all other cases, reflection will take care of security. if (type.Assembly == typeof(SecurityUtils).Assembly) { // if it's an internal type, we demand reflection permission. if (!(type.IsPublic || type.IsNestedPublic)) { (new ReflectionPermission(PermissionState.Unrestricted)).Demand(); } else if (allowNonPublic && !HasReflectionPermission) { // Someone is trying to invoke a ctor on a public type in *our* assembly, but does not // have full reflection permission. We shouldn't pass BindingFlags.NonPublic in this case. allowNonPublic = false; } } if (allowNonPublic) { flags |= BindingFlags.NonPublic; } ConstructorInfo ctor = type.GetConstructor(flags, null, argTypes, null); if (ctor != null) { return ctor.Invoke(args); } return null; } } } // 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
- Update.cs
- MimePart.cs
- IndependentAnimationStorage.cs
- SupportsEventValidationAttribute.cs
- ConnectionStringsExpressionBuilder.cs
- SelectingProviderEventArgs.cs
- WindowPattern.cs
- FixedDocumentSequencePaginator.cs
- PagesSection.cs
- DesignSurfaceCollection.cs
- MappingModelBuildProvider.cs
- BookmarkList.cs
- EditBehavior.cs
- ChannelFactoryRefCache.cs
- FormViewDeletedEventArgs.cs
- DBCommandBuilder.cs
- PropertyInfoSet.cs
- Normalization.cs
- JsonWriter.cs
- NameValuePair.cs
- IndependentAnimationStorage.cs
- CustomExpression.cs
- Pointer.cs
- DependencyProperty.cs
- UpdateManifestForBrowserApplication.cs
- FirstMatchCodeGroup.cs
- DynamicResourceExtensionConverter.cs
- EnumMember.cs
- NotFiniteNumberException.cs
- SqlPersonalizationProvider.cs
- SecurityException.cs
- JsonMessageEncoderFactory.cs
- ColorConvertedBitmap.cs
- LoopExpression.cs
- CompilerLocalReference.cs
- XmlCDATASection.cs
- CharAnimationBase.cs
- SoapAttributeAttribute.cs
- DefaultClaimSet.cs
- ContainerCodeDomSerializer.cs
- BlurBitmapEffect.cs
- ConsumerConnectionPointCollection.cs
- DataKey.cs
- SecurityManager.cs
- TextPointerBase.cs
- DockProviderWrapper.cs
- HttpCookiesSection.cs
- ReversePositionQuery.cs
- AttributedMetaModel.cs
- ReadOnlyMetadataCollection.cs
- UxThemeWrapper.cs
- AssertUtility.cs
- CmsInterop.cs
- PathFigure.cs
- SequentialUshortCollection.cs
- TargetException.cs
- TdsParserStaticMethods.cs
- NamespaceQuery.cs
- SEHException.cs
- FrameworkElementFactory.cs
- MembershipSection.cs
- LineGeometry.cs
- GPRECTF.cs
- FormViewModeEventArgs.cs
- RoleGroup.cs
- ScrollEvent.cs
- FlowDocumentScrollViewer.cs
- HyperLinkStyle.cs
- Ray3DHitTestResult.cs
- MethodToken.cs
- BitmapCacheBrush.cs
- InternalConfigSettingsFactory.cs
- DataGridViewComboBoxColumn.cs
- AsyncResult.cs
- TextEffect.cs
- MediaTimeline.cs
- DependentList.cs
- GridViewPageEventArgs.cs
- Help.cs
- SystemInfo.cs
- DrawToolTipEventArgs.cs
- ServiceOperationParameter.cs
- MenuAdapter.cs
- XmlSchemaException.cs
- FileUtil.cs
- Transform3D.cs
- LogLogRecord.cs
- ZoneButton.cs
- FrameDimension.cs
- OdbcError.cs
- Int16Animation.cs
- ToolboxItemWrapper.cs
- WpfSharedBamlSchemaContext.cs
- TreeNodeConverter.cs
- DBConcurrencyException.cs
- WebPartVerb.cs
- TrackingProfileCache.cs
- ExceptionUtil.cs
- Accessors.cs
- SharedPerformanceCounter.cs