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in SQL Server Management Studio. You access this dialog by right-clicking Credentials under Security and choosing New Credential. In figure 6.5, we've specified the SQLProxy-SalesSSISIm account, whose permissions4 have been reduced to the minimum required for executing our Integration Services package. For example, we ve granted the account read permissions to a directory containing files to import into the database. In addition to setting permissions at a domain/server level, we d add this credential as a SQL login with the appropriate database permissions. After creating the credential, we can now create the proxy. PROXIES You create a SQL Agent proxy in SQL Server Management Studio by right-clicking Proxies under SQL Server Agent and choosing New Proxy. The resulting screen, as shown in figure 6.6, allows you to specify the details of the proxy, including the name, the credential to use, and which subsystems the proxy can access. In our case, we ll use the credential we created earlier, and grant the proxy access to the SQL Server Integration Services (SSIS) Package subsystem. Members of the sysadmin group have access to all proxies. The Principals page enables non-sysadmin logins or server roles to be granted access to the proxy, thereby

Figure 6.6 A proxy is defined with a credential and granted access to one or more subsystems. Once created, it can be used in SQL Agent jobs to limit permissions.

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enabling such users to create and execute SQL Agent jobs in the context of the proxy s credential. With the proxy created, we can now create a SQL Agent job that uses it.

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When you create a SQL Server Agent job, one of the selections available for each job step is choosing its execution context, or Run As mode. For job steps that perform actions at the operating system level, you have two options for the Run As mode: SQL Agent Service Account or Proxy. As shown in figure 6.7, we ve created a SQL Agent job with a job step called Load Sales that uses the Load Sales Data Proxy that we created earlier. The end result of such a configuration is that the effective permissions of the Load Sales job step are those of the proxy s credential, which is restricted to the requirements of the SSIS package and nothing more, and therefore meets the least privilege objective. Additional SQL Agent jobs and their associated steps can use the Load Sales Data proxy, or have specific proxies created for their unique permission requirements, all without needing to alter the permissions of the service account used for SQL Server Agent. It s important to note that T-SQL job steps continue to run in the context of the SQL Agent job owner. The proxy/credential process I ve described is specific to job steps accessing resources outside of SQL Server. The ability to create multiple proxies for specific job types and with individual credentials and permissions allows you to implement a powerful and flexible permissions structure one that conforms to the principles of least privilege. In finalizing our coverage of least privilege, let s turn our attention to how user s permissions are secured within a server and database using role-based security.

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When discussing security in SQL Server, the terms principal and securable are commonly used. A principal is an entity requesting access to SQL Server objects (securables). For

example, a user (principal) connects to a database and runs a select command against a table (securable) When a principal requests access to a securable, SQL Server checks the permissions before granting or denying access Considering a database application with hundreds or thousands of principals and securables, it s easy to understand how the management of these permissions could become time consuming Further, the difficulty in management could lead to elevated permissions in an attempt to reduce the time required to implement least privilege Fortunately, SQL Server offers several methods for simplifying permissions management As a result, you can spend more time designing and deploying granular permissions to ensure the least privilege principle is applied all the way down to individual objects within a database.

While a full analysis of permissions management is beyond the scope of this book, it s important we spend some time looking at the means by which we can simplify and tighten permissions management using role-based security Let s start with a look at database roles DATABASE ROLES A database role, defined within a database, can be viewed in a similar fashion to an Active Directory group in a Windows domain: a database role contains users (Windows or SQL Server logins) and is assigned permissions to objects (schema, tables, views, stored procedures, and so forth) within a database Take our earlier example of the difficulty of managing the database permissions of thousands of users Using database roles, we can define the permissions for a database role once, and grant multiple users access to the database role.

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