You can create a realm around database objects to protect them, and then set authorizations to control user access to this data.
What Are Realms?
Realms enable you to protect database objects, including specific object types.
A realm is a grouping of database schemas, database objects, and database roles that must be secured for a given application.
Think of a realm as zone of protection for your database objects. A schema is a logical collection of database objects such as tables, views, and packages, and a role is a collection of privileges. By arranging schemas and roles into functional groups, you can control the ability of users to use system privileges against these groups and prevent unauthorized data access by the database administrator or other powerful users with system privileges. Oracle Database Vault does not replace the discretionary access control model in the existing Oracle database. It functions as a layer on top of this model for both realms and command rules.
Oracle Database Vault provides two types of realms: regular and mandatory. Both realm types can protect either an entire schema or crucial objects within a schema selectively, such as tables and indexes. With a regular realm, an object owner or users who has been granted object privileges can perform queries or DML operations without realm authorization but must have realm authorization to perform DDL operations. A mandatory realm provides stronger protection for objects within a realm. Mandatory realms block both object privilege-based and system privilege-based access and will not allow users with object privileges to perform queries, DML, or DDL operations without realm authorization. In other words, even an object owner cannot access his or her own objects without proper realm authorization if the objects are protected by mandatory realms.
For databases that use Oracle Flashback Technology, then both regular and mandatory realms will enforce the same behavior for a flashback table. Users can execute a
FLASHBACK TABLE SQL statement on a realm-protected table if the user is authorized to the realm.
For databases that use Information Lifecycle Management (ILM), a Database Vault administrator can use the
DBMS_MACADM.UNAUTHORIZE_MAINTENANCE_USER procedure to control who can perform ILM operations on realm-protected objects.
You can register schemas, all objects of a certain type in a schema, or individual objects within a schema into a realm. After you create a realm, you can register a set of schema objects or roles (secured objects) for realm protection and authorize a set of users or roles to access the secured objects. Objects that are protected by a regular realm allow DML access to users who have direct object grants.
For example, you can create a realm to protect all existing database schemas that are used in an accounting department. The realm prohibits any user who is not authorized to the realm to use system privileges to access the secured accounting data. When an entire schema is protected, all objects in the schema are protected, including tables, indexes, procedures and other objects.
You can run reports on realms that you create in Oracle Database Vault. You can use simulation mode during development, test, and even production phases to log only realm violations instead of blocking access. This enables you to quickly test applications using Database Vault realms.
You can configure realms by using the Oracle Database Vault Administrator pages in Oracle Enterprise Manager Cloud Control. Alternatively, you can configure realms by using the PL/SQL interfaces and packages provided by Oracle Database Vault.
Mandatory Realms to Restrict User Access to Objects within a Realm
By default, users who own or have object privileges are allowed to access realm-protected objects without explicit realm authorization.
You optionally can configure the realm to prevent these users' access by configuring it to be a mandatory realm. Mandatory realms block system privilege-based access as well as object privilege-based access. This means that even the object owner cannot have access if he or she is not authorized to access the realm. Users can access secured objects in the mandatory realm only if the user or role is authorized to do so.
Mandatory realms have the following additional characteristics:
If there are multiple mandatory realms on the same object, then you must authorize the user or role on all the mandatory realms before they can access the protected object.
If a role is protected by a mandatory realm, then no privileges can be granted to or revoked from the protected role except by the realm owner.
You can update regular realms that you created in earlier releases to be mandatory realms. This way, you can block owner access and object-privileged users from accessing the realm-protected objects.
Mandatory realms have the following benefits:
Mandatory realms can block object owners and object privileged users. In previous releases, blocking these users could only be done by defining complicated command rules.
Mandatory realms provide more flexible configurations for access control. For example, suppose you want to enable a user to access an object with certain conditions, such as in a specific time range during the day. You cannot grant object privileges to that user because realms do not block object privileges. You only can grant system privileges to the user and then authorize this user to the realm with a rule, or make a command rule on the command directly. These solutions are either very expensive in terms of computational cost or undesirable because they entail the excessive granting of privileges such as system privileges to the user. With a mandatory realm, you only need to grant object privileges to the user, with a rule for specific conditions, and then authorize this user to be a realm owner or participant. Thus, with mandatory realms, Oracle Database Vault policies have more flexibility without granting users excessive privileges.
Mandatory realms add a layer of protection during patch upgrades. During a patch upgrade, a database administrator may need to have direct access to a realm-protected object in order to perform a patch on the object. If there are tables that contain sensitive data, such as social security numbers, you can protect these tables from the administrator's access with mandatory realms during the patch upgrade. When patching is complete, and the database administrator no long needs access to the objects, you can disable mandatory realm protection and then re-enable the normal application realm protection so that the application protection can return to its normal state.
You can use mandatory realms to secure tables during runtime. During runtime, application data can be stored in many tables. It is better to have a single user such as a runtime schema to access these tables so that you can maintain the integrity and correctness of the data. If the application data is scattered in many different schemas, then schema owners and users with object privileges can change the data if they log into the database directly. To insure that users cannot update these tables without going through the runtime schema's procedures, you can use mandatory realms to protect the tables so that only the authorized user's procedures can access them. Because a regular realm does not block object owners and object-privileged users, you can use mandatory realms to block them. This way, only authorized users can access these tables during runtime.
You can freeze security settings by preventing changes to configured roles.
Realms in a Multitenant Environment
In a multitenant environment, you can create a realm to protect common objects in the application root.
The advantage of creating a realm in the application root instead of creating a large number objects and realms around these objects within individual pluggable databases (PDBs) is that you can create them in one place, the application root. This way, you can manage them centrally.
You cannot create a common realm in the CDB root.
A Database Vault common realm can be either a regular realm or a mandatory realm. The realm protects only objects within the application root, not local objects in a PDB. The CDB root, application root, and any affected PDBs all must be Database Vault enabled.
To configure a common realm, you must be commonly granted the
DV_ADMIN role. To grant common authorizations for a common realm, you must be in the application root. To propagate the realm to the PDBs that are associated with the application root, you must synchronize the application root. For example, to synchronize an application called
ALTER PLUGGABLE DATABASE APPLICATION saas_sales_app SYNC;
Object Types That Realms Can Protect
You can create realms around all objects in a schema of certain object types.
These object types are as follows:
|Object Types C-J||Object Types L-P||Object Types R-V|
Oracle Database Vault provides default realms, which are regular realms, not mandatory realms.
Oracle Database Vault Realm
The Oracle Database Vault realm protects configuration and role information in the Oracle Database Vault
The owners of all three of the
LBACSYS schemas are owners of this realm.
This realm protects the following objects:
Entire schemas that are protected:
Roles that are protected:
Schemas DV_A-DV_S Schemas DV_P-L Schemas DV_G-DV_X
PL/SQL package that is protected:
Database Vault Account Management Realm
The Database Vault Account Management realm defines the realm for the administrators who manage and create database accounts and database profiles.
This realm protects the
CONNECT roles. The owner of this realm can grant or revoke the
CREATE SESSION privilege to or from a user.
Oracle Enterprise Manager Realm
Oracle Database Vault provides a realm specifically for Oracle Enterprise Manager accounts.
The Oracle Enterprise Manager realm protects Oracle Enterprise Manager accounts that are used for monitoring and management (
DBSNMP user and the
Oracle Default Schema Protection Realm
Oracle Default Schema Protection Realm protects roles and schemas that are used with Oracle features such as Oracle Text.
The advantage of this grouping is that Oracle Spatial schemas (
MDDATA) are used extensively with Oracle Text (
CTXSYS), and Oracle OLAP is an application rather than a core Oracle Database kernel feature.
Oracle Default Schema Protection Realm Protected Roles and Schemas
Oracle Default Schema Protection Realm protects several roles and schemas.
Roles that are protected by default:
Schemas that are protected by default:
Roles that are recommended for protection:
Schemas that are recommended for protection:
Oracle Default Schema Protection Realm Owners
EXFSYS users are the default owners of Oracle Default Schema Protection Realm. These users can grant the roles protected by this realm to other users, and grant permissions on its schemas to other users as well.
Oracle System Privilege and Role Management Realm
Oracle System Privilege and Role Management Realm protects sensitive roles that are used to export and import data in an Oracle database.
This realm also contains authorizations for users who must grant system privileges.
SYS is the only default owner of this realm. Any user who is responsible for managing system privileges should be authorized as an owner to this realm. These users can grant the roles that are protected by this realm to other users.
Roles that are protected by default:
Roles A-E Roles G-J Roles J-S
Roles that are recommended for protection:
Creating a Realm
To enable realm protection, you create the realm and configure it to include realm-secured objects, roles, and authorizations.
- Log in to Oracle Database Vault Administrator from Cloud Control as a user who has been granted the
DV_ADMINrole and the
SELECT ANY DICTIONARYprivilege. Logging into Oracle Database Vault explains how to log in.
- In the Administration page, under Database Vault Components, click Realms.
- In the Realms page, click Create to display the Create Realm page.
- In the Create Realm page, enter the following settings:
Name: Enter a name for the realm. It can contain up to 90 characters in mixed-case. This attribute is mandatory.
Oracle suggests that you use the name of the protected application as the realm name (for example,
hr_appfor an human resources application).
Description: Enter a brief description of the realm. The description can contain up to 1024 characters in mixed-case. This attribute is optional.
You may want to include a description for the business objective of the given application protection and document all other security policies that compliment the realm's protection. Also document who is authorized to the realm, for what purpose, and any possible emergency authorizations.
Mandatory Realm: Select this check box to create the realm as a mandatory realm. See Mandatory Realms to Restrict User Access to Objects within a Realm for more information about mandatory realms.
Status: Select either Enabled, Disabled, or Simulation. This attribute is mandatory.
Audit Options: Select one of the following:
Audit Disabled: Does not create an audit record.
Audit on Success: Creates an audit record for authorized activities.
Audit on Failure: Creates an audit record when a realm violation occurs (for example, when an unauthorized user tries to modify an object that is protected by the realm).
Audit on Success or Failure: Creates an audit record for any activity that occurs in the realm, including both authorized and unauthorized activities.
In a non-unified auditing environment, Oracle Database Vault writes the audit trail to the
DVSYS.AUDIT_TRAIL$table. See Auditing Oracle Database Vault for more information. If you have enabled unified auditing, then this setting does not capture audit records. Instead, you must create audit policies to capture this information, as described in Oracle Database Security Guide. Oracle Database also provides a default policy,
ORA_DV_AUDPOL, that audits all actions that are performed on the Oracle Database Vault
DVFschema objects and the Oracle Label Security
- Click Next to display the Realm secured objects page.
See About Realm-Secured Objects for conceptual information about the settings for this page.
- Click the Add button, and in the Add Secured Object dialog box, enter the following information:
Object Owner: From the list, select the name of the database schema owner. You can enter the
%character if the object you want to secure with the realm is a role. This attribute is mandatory.
Object Type: From the list, select the type of the database object, such as
ROLE. This attribute is mandatory.
You can add as many objects of any type as you want to the realm.
By default, the Object Type box contains the % wildcard character to include all object types for the specified Object Owner. However, it does not include roles, which do not have specific schema owners in the database and must be specified explicitly.
Object Name: Enter the name of the object in the database that the realm must protect, or enter
%to specify all objects (except roles) for the object owner that you have specified. If you enter
%, then it can encompass all objects in the schema if
%is also used for the Object Type setting. But if Object Type is set to Tables, then using
%for the Object Name refers to all tables in the schema. This attribute is mandatory.
By default, the Object Name field contains the % wildcard character to encompass the entire schema specified for Object Type and Object Owner. Note that the % wildcard character applies to objects that do not yet exist and currently existing objects.
If you enter
%in the Object Name field, then it encompasses all objects in the schema if you also enter
%in the Object Type field. However, if you set Object Type to a specific object type, such as Tables, then the setting of
%in Object Type refers to all objects of that type (in this case, tables) in the schema.
- Click Next to display the Realm authorizations page.
See About Realm Authorization for conceptual information about the settings for this page.
- Click the Add button, and in the Add Authorizations dialog box, enter the following information:
Realm Authorization Grantee: From the list, select the database account or role to whom you want to grant the realm authorization.
This list shows all accounts and roles in the system, not just accounts with system privileges.
Realm Authorization Type: Select either of the following settings. This attribute is mandatory.
Participant: This account or role can exercise system privileges to access, manipulate, and create objects protected by the realm, provided that these privileges have been granted using the standard Oracle Database privilege grant process. A realm can have multiple participants.
Owner: This account or role has the same rights as the realm participant, plus the authorization to grant or revoke realm-secured database roles. The realm owner can grant or revoke privileges on realm-protected objects to other users. A realm can have multiple owners.
Realm Authorization Rule Set: Select from the available rule sets that have been created for your site. You can select only one rule set, but the rule set can have multiple rules.
See Creating a Rule to Add to a Rule Set for more information about defining rules to govern the realm authorization.
Any auditing and custom event handling associated with the rule set occurs as part of the realm authorization processing.
- Click Next to display the Review page.
- In the Review page, check the settings you have created.
- Click Finish to complete the realm creation.
About Realm-Secured Objects
Realm-secured objects define the territory—a set of schema and database objects and roles—that a realm protects.
You can create the following types of protections:
Objects from multiple database accounts or schemas can be under the same realm.
One object can belong to multiple realms.
If an object belongs to multiple realms, then Oracle Database Vault checks the realms for the proper authorization. For
SELECT, DDL, and DML statements, as long as a user is a participant in one of the realms, and if the command rules permit it, then the commands that the user enters are allowed. For
REVOKEoperations of a database role in multiple realms, the person performing the
REVOKEoperation must be the realm owner. Schema owners can perform DML operations on objects that are protected by multiple regular realms.
If one of the realms is a mandatory realm, then the user who wants to access the object must be a realm owner or participant in the mandatory realm. During the authorization checking process, the non-mandatory realms are ignored. If there are multiple mandatory realms that protect the object, then the user who wants to access the object must be authorized in all of the mandatory realms.
About Realm Authorization
Realm authorizations establish the set of database accounts and roles that manage or access objects protected in realms.
You can grant a realm authorization to an account or role to allow the use of its system privileges in the following situations:
When the user must create or access realm-secured objects
When a user must grant or revoke realm-secured roles
A user who has been granted realm authorization as either a realm owner or a realm participant can use its system privileges to access secured objects in the realm.
Note the following:
Realm owners cannot add other users to their realms as owners or participants. Only users who have the
DV_ADMINrole are allowed to add users as owners or participants to a realm.
Users who have been granted the
DV_OWNERrole can add themselves to a realm authorization.
A realm owner, but not a realm participant, can grant or revoke realm secured roles or grant or revoke object privileges on realm secured objects to anyone.
A user can be granted either as a realm owner or a realm participant, but not both. However, you can update the authorization types of existing realm authorizations.
Use the Edit Realm page to manage realm authorizations. You can create, edit, and remove realm authorizations.
Realm Authorizations in a Multitenant Environment
In a multitenant environment, the rules and behavior for common realm authorizations are similar to the authorizations for other common objects.
Local Authorization for a Common Realm
The local authorization for a common realm refers to the authorization a user has for the PDB that this user is accessing.
The rules for the local authorization for a common realm are as follows:
A user who has been commonly granted the
DV_ADMINrole can grant local authorization to common users, common roles, local users, and local roles. The common
DV_ADMINuser can also remove local authorization from a common realm in a PDB.
A local Database Vault administrator can authorize locally (that is, grant local authorizations to both local and common users) within the PDB. A common Database Vault administrator can also grant authorizations in each PDB. A common realm authorization can only be granted by a common Database Vault administrator in the application root.
The common Database Vault administrator can both add or remove local authorization to and from a common realm from within the PDB.
If a common user has only local authorization for a common realm, then this user cannot access the common realm in any other PDB than this local authorization.
A common user or a common role can have both the local authorization and the common authorization to a common realm at the same time. Removing a common user’s local authorization from a common realm does not affect the common user’s common authorization. Removing a common user’s common authorization from a common realm does not affect the common user’s local authorization.
Common Authorization for a Common Realm
The common authorization for a common realm refers to the authorization a common user or a common role has in the application root while the authorization takes effect in every container that is Database Vault enabled.
The rules for the local authorization for a common realm are as follows:
A user who has been commonly granted the
DV_ADMINrole can grant common realm authorization to common users or roles in the application root. This common Database Vault administrator can perform the removal of common authorizations while in the application root.
This common authorization applies to the containers that have been Database Vault enabled in the CDB.
If a common user is authorized to a common realm in the application root, then this user has access to the objects protected by the common realm in the application root and any application PDBs.
Any rule sets that are associated with a common realm must be common rule sets. The rules that are added to a common rule set that is associated with common authorization cannot involve any local objects.
How the Authorization of a Realm Works in Both the Application Root and in an Individual PDB
During the Database Vault enforcement in a container, a common realm performs the same enforcement behaviors as the same realm when it is used locally in a PDB.
Modifying the Enablement Status of a Realm
You can disable or enable a realm, or set the realm to use simulation mode, from Enterprise Manager Cloud Control.
- In the Oracle Database Vault Administration page, select Realms.
- In the Realms page, select the realm you want to disable or enable, and then select Edit.
- In the Edit Realm page, under Status in the General section, select either Disabled, Enabled, or Simulation.
- Click Done, and then click Finished.
Deleting a Realm
You can use Enterprise Manager Cloud Control to delete realms.
- Locate the various references to the realm that you want to delete by querying the realm-related Oracle Database Vault data dictionary views.
- If the Realm is part of a policy, then remove the realm from the policy.
- In the Oracle Database Vault Administration page, select Policies.
- Select the policy that contains the realm and then click Edit.
- Expand the Realms area.
- Select the realm and then click Remove.
- Click Next, then Finish.
- In the Administration page, under Database Vault Components, select Realms.
- In the Realms page, select the realm you want to delete, and then select Remove.
- In the Confirmation window, click Yes.
Oracle Database Vault deletes the configuration for the realm, including realm authorizations. It does not delete the rule sets used for realm authorizations.
How Realms Work
When an appropriately privileged database account issues a SQL statement that affects an object within a realm, a special set of activities occur.
These privileges include DDL, DML,
Does the SQL statement affect objects secured by a realm?
If yes, then go to Step 2. If no, then realms do not affect the SQL statement. Go to Step 7. If the object affected by the command is not secured in any realms, then realms do not affect the SQL statement being attempted.
Is the realm a mandatory realm or regular realm?
Is the database account using a system privilege to execute the SQL statement?
If yes, then go to Step 4. If no, then go to Step 6. If the session has object privileges on the object in question for
EXECUTE, and DML statements only, then the realm protection is not enforced. Realms protect against the use of any system privilege on objects or roles protected by the realm. Even users with object privileges for objects that are protected by regular realms are prevented from performing DDL operations.
Remember that if the
O7_DICTIONARY_ACCESSIBILITYinitialization parameter has been set to
TRUE, then non-
SYSusers have access to
SYSschema objects. For better security, ensure that
O7_DICTIONARY_ACCESSIBILITYis set to
Is the database account a realm owner or realm participant?
If yes, then go to Step 5. Otherwise, a realm violation occurs and the statement is not allowed to succeed. If the command is a
REVOKEof a role that is protected by the realm, or the
REVOKEof an object privilege on an object protected by the realm, then the session must be authorized as the realm owner directly or indirectly through roles.
Is the realm authorization for the database account conditionally based on a rule set?
Does the rule set evaluate to
If yes, then go to Step 7. If no, then there is a realm violation, so the SQL statement is not allowed to succeed.
Does a command rule prevent the command from executing?
If yes, then there is a command rule violation and the SQL statement fails. If no, then there is no realm or command rule violation, so the command succeeds.
For example, the
HRaccount may have the
DROP ANY TABLEprivilege and may be the owner of the
HRrealm, but a command rule can prevent
HRfrom dropping any tables in the
HRschema unless it is during its monthly maintenance window. Command rules apply to the use of the
ANYsystem privileges and object privileges and are evaluated after the realm checks.
In addition, because a session is authorized in a realm, it does not mean the account has full control on objects protected by the realm. Realm authorization does not implicitly grant extra privileges to the account. The account still must have system privileges or object privileges to access the objects. For example, an account or role may have the
SELECT ANY table privilege and be a participant in the
HR realm. This means the account or the account granted the role could query the
HR.EMPLOYEES table. Being a participant in the realm does not mean the account or role can
HR.EMPLOYEES table. Oracle Database Vault does not replace the discretionary access control model in the existing Oracle database. It functions as a layer on top of this model for both realms and command rules.
Note the following:
Protecting a table in a realm does not protect the view by default. Any view that must be protected should be added to the realm regardless of whether the view was created before or after the table was added to the realm.
For invoker's right procedures that access realm protected objects, the invoker of the procedure must be authorized to the realm.
Be aware that realm protection does not protect a table if access to the table has been granted to
PUBLIC. For example, if
table_nameis granted to
PUBLIC, then every user has access to
table_name(unless the table is protected by a mandatory realm), even if this table is protected by a realm. As a best practice, revoke unnecessary privileges from
How Authorizations Work in a Realm
Realm authorizations prevent users from performing activities if the users do not have the correct privileges.
About Authorizations in a Realm
Realms protect data from access through system privileges.
Realms do not give additional privileges to the data owner or participants.
The realm authorization provides a run-time mechanism to check logically if a user's command should be allowed or denied to access objects specified in the command and to proceed with its execution.
System privileges are sweeping database privileges such as
CREATE ANY TABLE and
DELETE ANY TABLE. These privileges typically apply across schemas and bypass the need for object privileges. Data dictionary views such as
ROLE_SYS_PRIVS list the system privileges for database accounts and roles. Database authorizations work normally for objects not protected by a realm. However, a user must be authorized as a realm owner or participant to successfully use his or her system privileges on objects secured by the realm. A realm violation prevents the use of system privileges and can be audited.
Mandatory realms block both object privileged-based access and system privilege-based access. This means that even the object owner cannot have access if he or she is not authorized to access the realm. Users can access secured objects in the mandatory realm only if the user or role is authorized to do so.
Examples of Realm Authorizations
You can create realms that protect objects from users who have system privileges and other powerful privileges, for example.
Example: Unauthorized User Trying to Create a Table
ORA-47401 error appears when unauthorized users try to create tables.
Example 5-1 shows what happens when an unauthorized user who has the
CREATE ANY TABLE system privilege tries to create a table in a realm where the
HR schema is protected by a realm.
Example 5-1 Unauthorized User Trying to Create a Table
CREATE TABLE HR.demo2 (col1 NUMBER(1));
The following output should appear
ORA-47401: Realm violation for CREATE TABLE on HR.DEMO2
As you can see, the attempt by the unauthorized user fails. Unauthorized use of system privileges such as
SELECT ANY TABLE,
CREATE ANY TABLE,
DELETE ANY TABLE,
UPDATE ANY TABLE,
INSERT ANY TABLE,
CREATE ANY INDEX, and others results in failure.
Example: Unauthorized User Trying to Use the DELETE ANY TABLE Privilege
ORA-01031: insufficient privileges error appears for unauthorized user access.
Example 5-2 shows what happens when an unauthorized database account tries to use his
DELETE ANY TABLE system privilege to delete an existing record, the database session returns the following error.
Example 5-2 Unauthorized User Trying to Use the DELETE ANY TABLE Privilege
DELETE FROM HR.EMPLOYEES WHERE EMPNO = 8002;
The following output should appear:
ERROR at line 1: ORA-01031: insufficient privileges
Realms do not affect direct privileges on objects. For example, a user granted delete privileges to the
HR.EMPLOYEES table can successfully delete records without requiring realm authorizations. Therefore, realms should minimally affect normal business application usage for database accounts.
Example: Authorized User Performing DELETE Operation
Authorized users are allowed to perform the activities for which they are authorized.
Example 5-3 shows how an authorized user can perform standard tasks allowed within the realm.
Example 5-3 Authorized User Performing DELETE Operation
DELETE FROM HR.EMPLOYEES WHERE EMPNO = 8002; 1 row deleted.
Access to Objects That Are Protected by a Realm
You can protect an object by a realm, but still enable access to objects that are part of this realm-protected object.
For example, suppose you create a realm around a specific table. However, you want users to be able to create an index on this table. You can accomplish this as follows, depending on the following scenarios.
The user does not have the CREATE ANY INDEX privilege. As the realm owner of the table, grant the
CREATE INDEX ON
tableprivilege to the user who must create the index.
The user has the CREATE ANY INDEX privilege. In this case, create another realm and make all index types as the secured objects and grant that user participant authorization to the realm. (Remember that having the
CREATE ANY INDEXprivilege alone is not sufficient for a non-realm participant to create an index in a realm-protected table.)
You want all of your database administrators to be able to create an index and they have the CREATE ANY INDEX privilege. In your data protection realm, specify all object types to be protected except the index types. This permits all of your administrators to create indexes for the protected table.
Example of How Realms Work
Realms can provide protection in which two users who each have the same privileges must have separate access levels for an object.
Figure 5-1 illustrates how data within a realm is protected.
In this scenario, two users, each in charge of a different realm, have the same system privileges. The owner of a realm can be either a database account or a database role. As such, each of the two roles,
HR_ADMIN, can be protected by a realm as a secured object and be configured as the owner of a realm.
Further, only a realm owner, such as
OE_ADMIN, can grant or revoke database roles that are protected by the realm. The realm owner cannot manage roles protected by other realms such as the
DBA role created by
SYS in the Oracle System Privilege and Role Management realm. Any unauthorized attempt to use a system privilege to access realm-protected objects raises a realm violation, which can be audited. The powers of each realm owner are limited within the realm itself. For example,
OE_ADMIN has no access to the Human Resources realm, and
HR_ADMIN has no access to the Order Entry realm.
Figure 5-1 How Authorizations Work for Realms and Realm Owners
Description of "Figure 5-1 How Authorizations Work for Realms and Realm Owners"
How Realms Affect Other Oracle Database Vault Components
Realms have no effect on factors, identities, or rule sets, but they do affect command rules.
With command rules, Oracle Database Vault evaluates the realm authorization first when processing SQL statements.
Guidelines for Designing Realms
Oracle provides a set of guidelines for designing realms.
Create realms based on the schemas and roles that form a database application.
Define database roles with the minimum and specific roles and system privileges required to maintain the application objects and grant the role to named accounts. You then can add the role as an authorized member of the realm. For object-level privileges on objects protected by the realm and required by an application, create a role and grant these minimum and specific object-level privileges to the role, and then grant named accounts this role. In most cases, these types of roles do not need to be authorized in the realm unless
ANY-style system privileges are already in use. A model using the principle of least privilege is ideal for any database application.
A database object can belong to multiple realms and an account or role can be authorized in multiple realms.
To provide limited access to a subset of a database schema (for example, just the
EMPLOYEEStable in the
HRschema), or roles protected by a realm, create a new realm with just the minimum required objects and authorizations.
If you want to add a role to a realm as a grantee, create a realm to protect the role. Doing so prevents users who have been granted the
GRANT ANY ROLEsystem privilege, such as the
SYSTEMuser account, from granting the role to themselves.
If you want to add the
SYSuser account to a realm authorization, you must add user
SYSexplicitly and not through a role (such as the
Be mindful of the privileges currently allowed to a role that you plan to add as a realm authorization.
Realm authorization of a role can be accidentally granted and not readily apparent if an account such as
SYSTEMcreates a role for the first time and the Oracle Database Vault administrator adds this role as a realm authorization. This is because the account that creates a role is implicitly granted the role when it is created.
Sometimes you must temporarily relax realm protections for an administrative task. Rather than disabling the realm, have the Security Manager (
DV_OWNER) log in, add the named account to the authorized accounts for the realm, and set the authorization rule set to Enabled. Then in the enabled rule set, turn on all auditing for the rule set. You can remove the realm authorization when the administrative task is complete.
If you want to grant
ANYprivileges to new users, Oracle recommends that you add a database administrative user to the Oracle System Privilege and Role Management realm so that this user can grant other users
ANYprivileges, if they need them. For example, using a named account to perform the
ANYoperations enables you to audit these operations, which creates an audit trail for accountability.
If you drop a table, index, or role that has been protected by a realm and then recreate it using the same name, the realm protection is not restored. You must re-create the realm protection for the new table, index, or role. However, you can automatically enforce protection for all future tables, indexes, and roles within a specified schema. For example, to enforce protection for all future tables:
BEGIN DBMS_MACADM.ADD_OBJECT_TO_REALM('realm_name', 'schema_name', '%', 'TABLE'); END; /
You can test the development phase of a realm by using simulation mode, which enables the realm but writes detailed information about violations to a log file.
How Realms Affect Performance
Realms can affect database performance in a variety situations, such as with DDL and DML operations.
DDL and DML operations on realm-protected objects do not have a measurable effect on Oracle Database. Oracle recommends that you create the realm around the entire schema, and then authorize specific users to perform only specific operations related to their assigned tasks. For finer-grained control, you can define realms around individual tables and authorize users to perform certain operations on them, and also have a realm around the entire schema to protect the entire application. Be aware, however, that this type of configuration may slow performance, but it does enable you to grant realm authorization to some of the objects in a schema.
Auditing affects performance. To achieve the best performance, Oracle recommends that you use fine-grained auditing rather than auditing all operations.
Periodically check the system performance. You can do so by running tools such as Oracle Enterprise Manager (including Oracle Enterprise Manager Cloud Control, which is installed by default with Oracle Database), Automatic Workload Repository (AWR), and
Realm Related Reports and Data Dictionary Views
Oracle Database Vault provides reports and data dictionary views that are useful for analyzing realms.
Table 5-1 Reports Related to Realms
Audits records generated by the realm protection and realm authorization operations
Lists authorization configuration information, such as incomplete or disabled rule sets, or nonexistent grantees or owners that may affect the realm
Lists rule sets that do not have rules defined or enabled, which may affect the realms that use them
Lists object privileges that the realm affects
Provides information about grantees and owners for a realm
Lists objects that the command rule affects
Table 5-2 lists data dictionary views that provide information about existing realms.
Table 5-2 Data Dictionary Views Used for Realms
|Data Dictionary View||Description|
Lists the realms created in the current database instance.
lists the authorization of a named database user account or database role (
Lists the database schemas, or subsets of schemas with specific database objects contained therein, that are secured by the realms