Security in Visual Studio .NET

Generation QR Code ISO/IEC18004 in Visual Studio .NET Security

Security
QR Code 2d Barcode Creation In Visual Studio .NET
Using Barcode generation for .NET framework Control to generate, create Quick Response Code image in .NET applications.
www.OnBarcode.com
QR Code Scanner In .NET Framework
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
The PermissionSet class also exposes the Demand, Deny, and Assert methods, which behave as they do with individual permission objects. You can undo the effect of these methods with the Revertxxxx shared methods of the CodeAccessPermission class, as you do when you demand, permit, and deny individual permission objects. The previous code example shows how to create a permission set by creating a Per missionSet object that is initially empty, and then adding individual permission objects to it by means of the AddPermission method. You can also start with a PermissionSet object that contains all the available permission objects and then remove specific types of permissions with the RemovePermission method:
Bar Code Creator In .NET
Using Barcode creator for VS .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Recognize Barcode In Visual Studio .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Create a permission set that contains all available permission objects.
Quick Response Code Printer In C#.NET
Using Barcode generator for .NET Control to generate, create QR image in .NET framework applications.
www.OnBarcode.com
Encoding QR Code JIS X 0510 In .NET
Using Barcode drawer for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
www.OnBarcode.com
Dim ps1 As New PermissionSet(PermissionState.Unrestricted)
Drawing Denso QR Bar Code In VB.NET
Using Barcode encoder for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Drawer In .NET
Using Barcode creator for VS .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Remove all permissions to access the file system.
Painting GTIN - 13 In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create UPC - 13 image in VS .NET applications.
www.OnBarcode.com
GS1-128 Creator In VS .NET
Using Barcode generator for .NET framework Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
ps1 = DirectCast(ps1.RemovePermission(GetType(FileIOPermission)), PermissionSet)
Encoding UPC Symbol In Visual Studio .NET
Using Barcode encoder for .NET Control to generate, create UPC A image in Visual Studio .NET applications.
www.OnBarcode.com
Draw Leitcode In Visual Studio .NET
Using Barcode creation for .NET Control to generate, create Leitcode image in .NET framework applications.
www.OnBarcode.com
ps1.PermitOnly()
Scan GS1 - 13 In .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Code 128 Code Set B Creator In None
Using Barcode creator for Font Control to generate, create Code 128A image in Font applications.
www.OnBarcode.com
This code has broadly the same effect as denying one or more permissions, but you can t be very granular about which permission to deny because you can only remove all the permissions of a given type (FileIOPermission, in this example). You also combine two permission sets with the Union and Intersect methods, and check whether a permission set contains all the permission objects that are defined in another permission set with the IsSubsetOf method:
Generating Bar Code In Objective-C
Using Barcode encoder for iPhone Control to generate, create bar code image in iPhone applications.
www.OnBarcode.com
Code 128 Code Set B Drawer In Objective-C
Using Barcode creation for iPad Control to generate, create Code 128 Code Set B image in iPad applications.
www.OnBarcode.com
(This code assumes that ps1 and ps2 are PermissionSet objects.) ps3 contains the permission objects defined either in ps1 or ps2. Dim ps3 As PermissionSet = DirectCast(ps1.Union(ps2), PermissionSet) ps4 contains only the permission objects defined both in ps1 and ps2. Dim ps4 As PermissionSet = DirectCast(ps1.Intersect(ps2), PermissionSet) Check that ps4 contains a subset of the permission objects in ps1. Console.WriteLine(ps4.IsSubsetOf(p1)) => True
Barcode Printer In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
www.OnBarcode.com
Drawing PDF-417 2d Barcode In .NET Framework
Using Barcode encoder for Reporting Service Control to generate, create PDF417 image in Reporting Service applications.
www.OnBarcode.com
The PermissionSet class can be serialized and deserialized to and from XML with the ToXml and FromXml methods, respectively. However, you usually invoke these meth ods on NamedPermissionSet objects, so I ll illustrate them in the following section.
Matrix 2D Barcode Creator In VB.NET
Using Barcode generator for .NET framework Control to generate, create Matrix Barcode image in .NET applications.
www.OnBarcode.com
EAN / UCC - 13 Encoder In Visual C#
Using Barcode printer for .NET framework Control to generate, create GTIN - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
The NamedPermissionSet Class
A NamedPermissionSet object is nothing but a permission set with a name and an optional description. The main reason to create such an object is to demand all the permissions defined in one of the predefined permission sets, that is: FullTrust, Everything, LocalIntranet, and Internet. This is a quick and simple way to ensure that your code runs under the level of trust you need:
Ensure that all our callers are fully trusted. Dim nps As New NamedPermissionSet( FullTrust ) nps.Demand()
Part VII:
Advanced Topics
Another reason for creating a NamedPermissionSet object is to save an XML file that you later import using the .NET Configuration tool:
Create a named permission set and assign a description.
Dim nps As New NamedPermissionSet( LimitedFileReaders", PermissionState.None)
nps.Description = Allows reading files in directory C:\MyData _
& and displaying UI elements" Add three permission objects to the permission set. nps.AddPermission(New FileIOPermission(FileIOPermissionAccess.AllAccess, _ c:\MyData )) nps.AddPermission(New RegistryPermission(PermissionState.Unrestricted)) nps.AddPermission(New UIPermission(PermissionState.Unrestricted))
This class doesn t expose methods that read and write files directly, and you must use the ToXml method together with a StreamWriter object:
Save definition of permission set to an XML file.
Dim sw As New StreamWriter( c:\custom permission.xml )
sw.Write(nps.ToXml)
sw.Close()
You can also deserialize an XML file with the FromXml method and a StreamReader object. Permission sets imported in the .NET Configuration tool can be later associated with code groups. You can t change the permissions in the permission set once you have imported it, but you can rename it and add a description in its Properties window. (See Figure 33-9.)
Figure 33-9 You can create a custom permission set by importing an XML file (left) and later assign the permission set object a name and a description (right).
Working with Declarative Security
You can control many facets of CAS by means of attributes. In some cases, these attributes let you achieve the same effect you can reach by invoking methods of Permis sion and PermissionSet objects. In other cases, these attributes provide functionality that
33:
Copyright © OnBarcode.com . All rights reserved.