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With the confidence that our clients, servers, and network are now secure, we can focus on database access The goal here is to determine precisely the data that each database user needs to conduct business, and what the user is permitted to do with the data (that is, select, insert, update, or delete) Each database user should be given exactly the privileges required nothing more and nothing less Recall that an application program with database access is a database user, as is an employee who directly queries the database
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10: Database Security
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In terms of database security, all database users should be treated in the same way (that is, the same standards should be applied to all), whether the database user is software or liveware In this section, we will explore the options and challenges related to securing access to the database and its data
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For DBAs who support databases from multiple vendors, one of the challenges is that, with the exception of Microsoft SQL Server and Sybase Adaptive Server Enterprise (ASE), no two databases have the same architecture for database security And of course, this is a side effect of the overall database architectures being different The only reason that Microsoft SQL Server and Sybase ASE have such similar architectures is that the former was derived from the later Because Microsoft SQL Server/Sybase ASE and Oracle are among the most popular databases today, let s have a quick look at how each implements database security
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Database Security in Microsoft SQL Server and Sybase ASE
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With Microsoft SQL Server and Sybase ASE, once the DBMS software is installed on the server, a database server is created Server is a confusing term, of course, because we call the hardware a server In this case, the term SQL server is a copy of the DBMS software running in memory as a set of processes (usually installed as services in Windows environments) with related control information that is stored in a special database on the database server We will use the term SQL server to mean the DBMS software and the term database server to mean the hardware platform on which the database is running In this architecture, each SQL server manages many databases, with each database representing a logical grouping of data as determined by the database designer Figure 10-1 shows a simplified view of the security architecture for Microsoft SQL Server and Sybase ASE
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Login A user account on the SQL server, a login is also called a user login This is not the same as any operating system account the user may have on the database server However, on database servers running Microsoft Windows, the login can use Windows authentication, meaning the Windows operating system stores the credentials (login name and password) and authenticates users when they attempt to connect to the SQL server An obvious advantage to Windows authentication is that user access to the various SQL servers in the enterprise can be centrally managed through the Windows account, rather than locally managed on each SQL server Note that once a login is defined in the SQL server, the database user may connect to the SQL server, but a login alone does not give the user access to any database information There is, however, a master login
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Databases: A Beginner s Guide
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SQL Server Dev1 Database Employees User A
t an Gr
Login Mgr125
c Ac
User B
Grant Object Privileges
Table T1
Table T2
Database Products
an tA
User C
Table T3 Grant Object Privileges
cc es s
User D
Table T4
Figure 10-1 Security in Microsoft SQL Server and Sybase ASE
called sa (system administrator) that, similar to root in Unix and Administrator in Microsoft Windows, has full privileges to everything in the SQL Server environment Figure 10-1 shows only one user login, called Mgr125
Database A database is a logical collection of database objects (tables, views, indexes, and so on) as defined by the database designer Figure 10-1 shows two databases: Employees and Products You must understand that a login is allowed to connect to a database only after it has been granted that privilege by an administrator (See the User topic that follows) In addition to databases holding system data, some special databases are created when the SQL server is created (not shown in Figure 10-1) and are used by the DBMS to manage the SQL server Among these are the following databases:
master The master database contains system-level information, initialization settings, configuration settings, login accounts, the list of databases configured in the SQL server, and the location of primary database data files tempdb The tempdb database contains temporary tables and temporary stored procedures model The model database contains a template for all other databases created on the system msdb In Microsoft SQL Server databases only, the msdb database contains information used for scheduling jobs and alerts
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