DB2 Database Security
This chapter describes database security.
DB2 database and functions can be managed by two different modes of security controls:
Authentication is the process of confirming that a user logs in only in accordance with the rights to perform the activities he is authorized to perform. User authentication can be performed at operating system level or database level itself. By using authentication tools for biometrics such as retina and figure prints are in use to keep the database from hackers or malicious users.
For DB2, the security service is a part of operating system as a separate product. For Authentication, it requires two different credentials, those are userid or username, and password.
You can access the DB2 Database and its functionality within the DB2 database system, which is managed by the DB2 Database manager. Authorization is a process managed by the DB2 Database manager. The manager obtains information about the current authenticated user, that indicates which database operation the user can perform or access.
Here are different ways of permissions available for authorization:
Primary permission: Grants the authorization ID directly.
Secondary permission: Grants to the groups and roles if the user is a member
Public permission: Grants to all users publicly.
Context-sensitive permission: Grants to the trusted context role.
Authorities provide of control over instance-level functionality. Authority provide to group privileges, to control maintenance and authority operations. For instance, database and database objects.
Instance level authorities
Let us discuss some instance related authorities.
System administration authority (SYSADM)
It is highest level administrative authority at the instance-level. Users with SYSADM authority can execute some databases and database manager commands within the instance. Users with SYSADM authority can perform the following operations:
System control authority (SYSCTRL)
It is the highest level in System control authority. It provides to perform maintenance and utility operations against the database manager instance and its databases. These operations can affect system resources, but they do not allow direct access to data in the database.
System maintenance authority (SYSMAINT)
It is a second level of system control authority. It provides to perform maintenance and utility operations against the database manager instance and its databases. These operations affect the system resources without allowing direct access to data in the database. This authority is designed for users to maintain databases within a database manager instance that contains sensitive data.
Each database authority holds the authorization ID to perform some action on the database. These database authorities are different from privileges. Here is the list of some database authorities:
ACCESSCTRL: allows to grant and revoke all object privileges and database authorities.
BINDADD: Allows to create a new package in the database.
CONNECT: Allows to connect to the database.
CREATETAB: Allows to create new tables in the database.
CREATE_EXTERNAL_ROUTINE: Allows to create a procedure to be used by applications and the users of the databases.
DATAACCESS: Allows to access data stored in the database tables.
DBADM: Act as a database administrator. It gives all other database authorities except ACCESSCTRL, DATAACCESS, and SECADM.
EXPLAIN: Allows to explain query plans without requiring them to hold the privileges to access the data in the tables.
IMPLICIT_SCHEMA: Allows a user to create a schema implicitly by creating an object using a CREATE statement.
LOAD: Allows to load data into table.
QUIESCE_CONNECT: Allows to access the database while it is quiesce (temporarily disabled).
SECADM: Allows to act as a security administrator for the database.
SQLADM: Allows to monitor and tune SQL statements.
WLMADM: Allows to act as a workload administrator
Authorization ID privileges involve actions on authorization IDs. There is only one privilege, called the SETSESSIONUSER privilege. It can be granted to user or a group and it allows to session user to switch identities to any of the authorization IDs on which the privileges are granted. This privilege is granted by user SECADM authority.
This privileges involve actions on schema in the database. The owner of the schema has all the permissions to manipulate the schema objects like tables, views, indexes, packages, data types, functions, triggers, procedures and aliases
This allows to delete the objects within the schema.
These privileges involve actions on the tablespaces in the database. User can be granted the USE privilege for the tablespaces. The privileges then allow them to create tables within tablespaces. The privilege owner can grant the USE privilege with the command WITH GRANT OPTION on the tablespace when tablespace is created. And SECADM or ACCESSCTRL authorities have the permissions to USE privileges on the tablespace.
Table and view privileges
The user must have CONNECT authority on the database to be able to use table and view privileges. The privileges for tables and views are as given below:
It provides all the privileges for a table or a view including drop and grant, revoke individual table privileges to the user.
It allows user to modify a table.
It allows the user to delete rows from the table or view.
It allows the user to insert a row into table or view. It can also run import utility.
It allows the users to create and drop a foreign key.
It allows the user to retrieve rows from a table or view.
It allows the user to change entries in a table, view.
User must have CONNECT authority to the database. Package is a database object that contains the information of database manager to access data in the most efficient way for a particular application.
It provides the user with privileges of rebinding, dropping or executing packages. A user with this privileges is granted to BIND and EXECUTE privileges.
It allows the user to bind or rebind that package.
Allows to execute a package.
This privilege automatically receives CONTROL privilege on the index.
Sequence automatically receives the USAGE and ALTER privileges on the sequence.
It involves the action of routines such as functions, procedures, and methods within a database.
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