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Managing Application Security Using a Proxy User
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Security does not have to be implemented on SQL Server. If the application is developed using three-tier architecture, objects can use roles, users, and other
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10: Interaction with the SQL Server Environment
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Stored procedures are accessible even when underlying objects are not.
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security features of Microsoft Transaction Server (on Windows NT) or Component Services (in Windows 2000) to implement security. Security is sometimes also implemented inside the client application. In both cases, database access is often accomplished through a single database login and user. Such a user is often called a proxy user.
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The worst such solution occurs when the client application developer completely ignores SQL Server security and achieves database access using the sa login. I have seen two variants on this solution. One occurs when the developer hard-codes the sa password inside an application. The administrator is then prevented from changing the password (or the application will stop functioning) and the security of the entire SQL Server is exposed. The other occurs when a developer stores login information in a file or Registry so that it can be changed later. Unfortunately, it can also be read by unauthorized people, and again, SQL Server security is compromised.
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Managing Application Security Using Application Roles
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Application roles are designed to implement security for particular applications. They are different from standard database roles in that Application roles require passwords to be activated. They do not have members. Users access a database via an application. The application contains the name of the role and its password. SQL Server ignores all other user permissions when the application role is activated. To create an application role, administrators should use sp_addapprole:
Exec sp_addapprole @rolename = 'Accounting', @password = 'password'
Permissions are managed using Grant, Deny, and Revoke statements in the usual manner. A client application (or a middle-tier object) should first log in to SQL Server in the usual manner and then activate the application role using sp_setapprole:
Exec sp_setapprole @rolename = 'Accounting', @password = 'password'
Source Code Management and Database Deployment
IN THIS CHAPTER:
CHAPTER
The Concept of Source Code Management Database Deployment
SQL Server 2000 Stored Procedure & XML Programming
ource code control (or version control) is typically introduced in development environments in which more than one developer needs to work with the same piece of code. It allows development organizations and their members to
Manage code centrally Manage multiple versions of the same code Track change history Compare versions Prevent or allow developers from modifying the same piece of code at the same time Synchronize deployment of all modifications needed to implement a single feature or bug fix The problem that you will face relatively often is that, while you develop your database (and application) in a development environment, you must deploy the database first in a test environment and then in a production environment. Initially, you need to deploy the complete database, but later you will have to update the database with design changes and hotfixes. In this chapter, I will introduce methods and tools for source code management and database deployment. I will present solutions using two different approaches. One approach is for developers who have Visual Studio .NET (and who are probably doing both database and application development). The other, more traditional, approach is geared toward SQL Server specialists who are working with traditional database development tools. I will use the tools that are delivered with SQL Server, as well as tools that I have developed, to automate some processes.
The Concept of Source Code Management
Microsoft provides source code control software as an integral part of its development environment under the name Visual SourceSafe. This application allows developers to control their most valuable asset source code. You can also use the Visual SourceSafe database to manage other file types such as web content, documentation, and test data, but our focus in this chapter is on how to use Visual SourceSafe to manage database objects.
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