source code to generate barcode in vb.net 24: Configuring a Windows Application in C#

Make UPCA in C# 24: Configuring a Windows Application

24: Configuring a Windows Application
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Security Piece Type Description
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Evidence
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Application Directory Hash Publisher Site Strong Name URL Zone FullTrust Everything LocalIntranet Internet Execution Nothing Root Child groups
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Security policy levels
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Installation directory Cryptographic hash Software publisher s signature URL, directory, or other location of the software Assembly s strong name URL of the software Originating zone of the software No limitations All but security verification Enterprise permissions Origin is unknown No access to system resources No permissions Represents all code Made up of group name, membership condition, and permission; examples are Site, Internet, Publisher, etc Code belonging to the enterprise Code on the computer Code belonging to the user Code in the application domain
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PART IV
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Table 24-4
Evidence, Permissions, Code Groups, and Security Policy Levels
Here s a series of steps that provides an example of security at work: 1 An assembly is located locally in the application directory on the computer and has a publisher certificate 2 The assembly belongs to the Root Code group by default, since its membership criteria is all code 3 The assembly belongs to a publisher group 4 The assembly belongs to the application directory, as well 5 Permissions thus are the combination of the Root, the publisher, and the application directory
Working with Security Policies
The NET Framework comes with a Code Access Policy command-line utility you can use to view and configure security policies: caspolexe
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Using this tool, you can modify the security policy for the machine, the user, or the enterprise policy level We don t need to go into great detail for this tool, since you just need to know that it exists for the Microsoft exam; however, it warrants spending a bit of time on its use To view the security policies for the various levels, you can use the following statement at a command prompt, choosing the appropriate level:
caspol [-enterprise | -machine | -user | -all] list
Figure 24-6 shows an excerpt from the command output from caspol machine -list From the output in Figure 24-6, you can see the different code groups and the reference number or name that you can use to specify them You will also see the membership condition name and the condition value, along with the name of the permission set associated with it
Figure 24-6
Output from the caspol command
24: Configuring a Windows Application
You can use the Code Access Policy tool to add code groups (among other things) To add a new code group, type the following:
caspol machine addgroup <parentName> <pset_name> <mship>
For example, suppose you wanted to add a code group that targets code from Internet Explorer trusted sites You could use the following command:
caspol addgroup All_Code zone Trusted LocalIntranet
Before we get too carried away with information not required for the Windows exam, remember that you can configure a lot of the security by using the NET Framework Configuration tool Figure 24-7 illustrates the configuration possibilities available using this tool EXAM TIP For the exam, remember that evidence is the set of information about the identity and origin of an assembly; permissions are the rights to protected resources, and security policies are used to map evidence with the permissions Security policies include Enterprise, Machine, User, and Application Domain Also remember that the most restrictive rules are applied PART IV
Figure 24-7
Using the NET Framework Configuration tool for configuring security
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Role-Based Security
The second type of security that can be set on an application is role-based security This involves determining the type of user (or the role that the user plays) and granting permission or denying permission based on that role For example, you may have an application that requires managers to perform a certain duty However, clerks may be using the same application but are not permitted to perform the same duty These restrictions may be as simple as letting a manager change customer details, and letting only a clerk view those details By implementing role-based security, you can control this Role-based security is controlled by passing information about the principal (the identity) of the caller on the current thread This can take the form of a Windows account, or some other form The application then makes decisions based on the principal and the role to which the user has been assigned The role is a collection of principals that have the same permissions for example, all clerks would be one role, all managers would be another role Note that a principal can be a member of several roles The manager may also be a member of the clerk role, thereby permitting the manager to view customer details as well as change them The following program demonstrates the use of principals and role-based security
using System; using SystemThreading; using SystemSecurityPrincipal; public class TestRoleBasedSecurity { public static void Main() { AppDomainCurrentDomainSetPrincipalPolicy ( PrincipalPolicyWindowsPrincipal); WindowsPrincipal w = (WindowsPrincipal) ThreadCurrentPrincipal; if (wIsInRole(WindowsBuiltInRoleAdministrator)) { // execute code for Administrators } } }
Notice that the IsInRole() method tests for a built-in Windows role namely Administrator This is one of the ways you can use roles You can also create generic roles using the GenericIdentity and GenericPrincipal classes; however, that is outside of the scope of the Windows exam For the exam, just be aware of two key elements of role-based security: Identity This can be as simple as the user s login name It could also be a Passport account or a cookie-authenticated user (for an ASPNET application) Principal This is the role (or roles) to which the user belongs
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