qr code generator asp net c# Application Security in C#.NET

Generating QR-Code in C#.NET Application Security

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Application Security
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Table 11-1
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Evidence Types
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Description The directory in which the assembly resides. The cryptographic hash of the assembly, which uniquely identifies a specific version of an assembly. Any modifications to the assembly make the hash invalid. The assembly s publisher s digital signature, which uniquely identifies the software developer. Using Publisher evidence requires the assembly to be signed. The site from which the assembly was downloaded, such as www.microsoft.com. The cryptographic strong name of the assembly, which uniquely identifies the assembly s namespace. The assembly must be signed to use Strong Name evidence. The URL from which the assembly was downloaded, such as www.microsoft.com/assembly.exe. The zone in which the assembly is running, such as the Internet zone or the LocalIntranet zone.
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URL Zone
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There are two types of evidence: host evidence and assembly evidence. Host evidence describes the assembly s origin, such as the application directory, URL, or site. Host evidence can also describe the assembly s identity, such as the hash, publisher, or strong name. Assembly evidence is custom user- or developer-provided evidence.
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What Is a Permission
A permission is a CAS access control entry. For example, the File Dialog permission determines whether an assembly can prompt the user with the Open dialog box, the Save dialog box, both, or neither. Figure 11-1 shows the File Dialog permission being configured. By default, 19 permissions are available for configuration in the .NET Framework Configuration tool. Each corresponds to two members of the System.Security.Permissions namespace: one for imperative use and one for declarative use. Table 11-2 describes each of these permissions. Additionally, you can add custom permissions.
Lesson 1: Understanding Code Access Security
Figure 11-1
Permissions specify whether an assembly can and can t do specific actions
Table 11-2 Default Permissions
Permission Directory Services
Description Grants an assembly access to the Active Directory. You can specify paths, and whether Browse or Write access is available. Enables or restricts an assembly s access to submit DNS requests. Grants assemblies access to environment variables, such as Path, Username, and Number_Of_Processors. You can grant an assembly access to all environment variables, or specify those that the assembly should be able to access. To view all environment variables, open a command prompt and run the command Set. Provides an assembly access to event logs. You can grant unlimited access or limit access to browsing or auditing. Controls whether an assembly can prompt the user with the Open dialog box, the Save dialog box, or both.
DNS Environment Variables
Event Log File Dialog
11
Application Security
Table 11-2
Default Permissions
Permission File IO
Description Restricts access to files and folders. You can grant an assembly unrestricted access, or you can specify a list of paths and whether each path should grant Read, Write, Append, or Path Discovery access. Grants assemblies access to isolated storage. You can configure the level of isolation and the size of the disk quota. Allows an assembly to access message queues, which can be restricted by path and access type. Controls whether an assembly can read or write performance counters. Limits an assembly s capability to print. Controls whether an assembly can discover member and type information in other assemblies. Restricts access to registry keys. You can grant an assembly unrestricted access; or you can specify a list of keys and whether each key should grant Read, Write, or Delete access. Provides granular control over the assembly s access to various CAS features. All assemblies must at least have the Enable Assembly Execution setting to run. This permission also controls whether assemblies can call unmanaged code, assert permissions, and control threads, among other settings. Specifies which services, if any, an assembly can browse or control. Used to control whether an assembly can initiate TCP/IP connections. You can control the destination, port number, and protocol. Controls whether an assembly can access SQL Server, and whether blank passwords are allowed.
Isolated Storage File Message Queue Performance Counter Printing Reflection Registry
Security
Service Controller Socket Access
SQL Client
Lesson 1: Understanding Code Access Security
Table 11-2 Default Permissions
Permission User Interface Web Access X509 Store
Description Determines whether an assembly can create new windows or access the clipboard. Determines whether the assembly can access Web sites and which Web sites can be accessed. Grants assemblies access to the X509 certificate store and controls whether they can add, remove, and open certificate stores.
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