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Designing DDL Triggers
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New in SQL Server 2005 is the capability to create triggers for DDL operations. Exam ples include creating triggers when a table is created, when a login is added to the instance, or when a new database is created. The main purpose of DDL triggers is to audit as well as regulate actions performed on a database. This enables DDL operations to be restricted even if a user might normally have the permission to execute the DDL command. For example, you want to prevent anyone, including members of the sysadmin fixed server role, from altering or dropping tables in a production environment. You can
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Lesson 2: Designing Database Security
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create a DDL trigger for the ALTER TABLE and DROP TABLE events that would cause the commands to be rolled back and a message returned, telling them that approval is needed before the table can be altered or dropped. The general syntax for creating a DDL trigger is as follows:
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CREATE TRIGGER trigger_name
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ON { ALL SERVER | DATABASE }
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[ WITH <ddl_trigger_option> [ ,...n ] ]
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{ FOR | AFTER } { event_type | event_group } [ ,...n ]
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AS { sql_statement [ ; ] [ ,...n ] | EXTERNAL NAME < method specifier > [ ; ] }
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<ddl_trigger_option> ::= [ ENCRYPTION ] [ EXECUTE AS Clause ] <method_specifier> ::= assembly_name.class_name.method_name
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MORE INFO
Event groups
The events that are valid for DDL triggers can be found in the Books Online article, Event Groups for Use with DDL Triggers.
An example of a DDL trigger is as follows:
CREATE TRIGGER tddl_tabledropalterprevent ON DATABASE FOR DROP_TABLE, ALTER_TABLE AS PRINT 'You are attempting to drop or alter tables in production!' ROLLBACK ;
Quick Check
1. Which permission is required to allow a database user to manage objects and set permissions on a schema 2. Which commands fire a DDL trigger 3. What are the components within the encryption hierarchy
Quick Check Answers
1. By granting the CONTROL permission on a schema, a principal can man age objects as well as permissions on a schema.
6
Designing Database Security
2. Any DDL command that can be issued within SQL Server can cause a trig ger to fire. Examples are CREATE, ALTER, and DROP. 3. A service master key is tied to the SQL Server service account. A database master key can be generated for each database that is encrypted using the service master key. Within a database, certificates and asymmetric keys are encrypted using the database master key. Certificates or asymmetric keys can be used to encrypt symmetric keys. Symmetric keys, asymmetric keys, and certificates can be used to encrypt data.
Practice: Encryption
In these practices, you create various forms of encryption.
Exercise 1: Creating a Database Master Key
In this exercise, you create a database master key that will be used for all other keys that will be created in subsequent practices. In SSMS, open a new query window, and change the database context to the Adven tureWorks database. 1. Execute the following code:
CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'P@55w0rd'
2. Execute the following code to verify the creation of the database master key:
SELECT * FROM sys.symmetric_keys
Exercise 2: Encrypting Data with a Passphrase
In this exercise, you test the simplest form of encryption: encrypting data by a static passphrase. 1. In SSMS, open a new query window, and change the database context to the AdventureWorks database. 2. Execute the following code:
DECLARE DECLARE DECLARE DECLARE @plaintext nvarchar(50)
@key nvarchar(50)
@decrypted nvarchar(50)
@encrypted varbinary(52) --requires two additional bytes
SET @plaintext ='Text to encrypt'
SET @key='MyPassPhrase'
SET @encrypted= EncryptByPassPhrase(@key,@plaintext)
Lesson 2: Designing Database Security
SET @decrypted = DecryptByPassPhrase (@key,@encrypted) SELECT @encrypted EncryptedText, @decrypted DecryptedText
Exercise 3: Creating a Self-Signed Certificate
In this exercise, you create a certificate and store it in the AdventureWorks database. You can then encrypt and decrypt data using this certificate. 1. In SSMS, open a new query window, and change the database context to the AdventureWorks database. 2. Execute the following code:
CREATE CERTIFICATE MyCert WITH SUBJECT = 'TestEncryption'
3. Verify the creation of the certificate by executing the following code:
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