8 DBMS_XSTREAM_AUTH

The DBMS_XSTREAM_AUTH package provides subprograms for granting privileges to and revoking privileges from XStream administrators.

Note:

This functionality is available starting with Oracle Database 11g Release 2 (11.2.0.2).

This chapter contains the following topic:

Using DBMS_XSTREAM_AUTH
- Overview
- Security Model
Summary of DBMS_XSTREAM_AUTH Subprograms

Using DBMS_XSTREAM_AUTH

This section contains topics which relate to using the DBMS_XSTREAM_AUTH package.

Overview
Security Model

Overview

This package provides subprograms for granting privileges to XStream administrators and revoking privileges from XStream administrators.

Security Model

Security on this package can be controlled in either of the following ways:

Granting EXECUTE on this package to selected users or roles.
Granting EXECUTE_CATALOG_ROLE to selected users or roles.

If subprograms in the package are run from within a stored procedure, then the user who runs the subprograms must be granted EXECUTE privilege on the package directly. It cannot be granted through a role.

To ensure that the user who runs the subprograms in this package has the necessary privileges, connect as an administrative user who can create users, grant privileges, and create tablespaces when using this package.

Summary of DBMS_XSTREAM_AUTH Subprograms

Table 8-1 DBMS_XSTREAM_AUTH Package Subprograms

Subprogram	Description
GRANT_ADMIN_PRIVILEGE Procedure	Either grants the privileges needed by a user to be an XStream administrator directly, or generates a script that grants these privileges
GRANT_REMOTE_ADMIN_ACCESS Procedure	Enables a remote XStream administrator to perform administrative actions at the local database by connecting to the grantee using a database link
REVOKE_ADMIN_PRIVILEGE Procedure	Either revokes XStream administrator privileges from a user directly, or generates a script that revokes these privileges
REVOKE_REMOTE_ADMIN_ACCESS Procedure	Disables a remote XStream administrator from performing administrative actions by connecting to the grantee using a database link

Note:

All subprograms commit unless specified otherwise.

GRANT_ADMIN_PRIVILEGE Procedure

This procedure either grants the privileges needed by a user to be an XStream administrator directly, or generates a script that grants these privileges.

Syntax

DBMS_XSTREAM_AUTH.GRANT_ADMIN_PRIVILEGE(
   grantee           IN  VARCHAR2,
   grant_privileges  IN  BOOLEAN   DEFAULT TRUE,
   file_name         IN  VARCHAR2  DEFAULT NULL,
   directory_name    IN  VARCHAR2  DEFAULT NULL);

Parameters

Table 8-2 GRANT_ADMIN_PRIVILEGE Procedure Parameters

Parameter	Description
`grantee`	The user to whom privileges are granted
`grant_privileges`	If `TRUE`, then the procedure grants the privileges to the specified grantee directly, and adds the grantee to the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view with `YES` for both the `LOCAL_PRIVILEGES` column and the `ACCESS_FROM_REMOTE` column. If the user already has an entry in this data dictionary view, then the procedure does not make another entry, and no error is raised. If `TRUE` and any of the grant statements fails, then the procedure raises an error. If `FALSE`, then the procedure does not grant the privileges to the specified grantee directly, and does not add the grantee to the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view. You specify `FALSE` when the procedure is generating a file that you will edit and then run. If you specify `FALSE` and either the `file_name` or `directory_name` parameter is `NULL`, then the procedure raises an error.
`file_name`	The name of the file generated by the procedure. The file contains all of the statements that grant the privileges. If a file with the specified file name exists in the specified directory name, then the grant statements are appended to the existing file. If `NULL`, then the procedure does not generate a file.
`directory_name`	The directory into which the generated file is placed. The specified directory must be a directory object created using the SQL statement `CREATE` `DIRECTORY`. If you specify a directory, then the user who invokes the procedure must have the `WRITE` privilege on the directory object. If `t`he `file_name` parameter is `NULL`, then this parameter is ignored, and the procedure does not generate a file. If `NULL` and the `file_name` parameter is non-`NULL`, then the procedure raises an error.

Usage Notes

The user who runs the procedure must be an administrative user who can grant privileges to other users.

Specifically, the procedure grants the following privileges to the specified user:

The RESTRICTED SESSION system privilege
EXECUTE on the following packages:
- DBMS_APPLY_ADM
- DBMS_AQ
- DBMS_AQADM
- DBMS_AQIN
- DBMS_AQELM
- DBMS_CAPTURE_ADM
- DBMS_FLASHBACK
- DBMS_LOCK
- DBMS_PROPAGATION_ADM
- DBMS_RULE_ADM
- DBMS_STREAMS_ADM
- DBMS_STREAMS_ADVISOR_ADM
- DBMS_STREAMS_HANDLER_ADM
- DBMS_STREAMS_MESSAGING
- DBMS_TRANSFORM
- DBMS_XSTREAM_ADM
Privileges to enqueue messages into and dequeue messages from any queue
Privileges to manage any queue
Privileges to create, alter, and execute any of the following types of objects in the user's own schema and in other schemas:
- Evaluation contexts
- Rule sets
- Rules
In addition, the grantee can grant these privileges to other users.
SELECT_CATALOG_ROLE
SELECT privilege on data dictionary views related to XStream and Oracle Streams
The ability to allow a remote XStream administrator to perform administrative actions through a database link by connecting to the grantee

This ability is enabled by running the GRANT_REMOTE_ADMIN_ACCESS procedure in this package.
Note:
- To view all of the statements run by the procedure in detail, you can use the procedure to generate a script and then view the script in a text editor.
- This procedure grants only the privileges necessary to configure and administer an XStream environment. You can grant additional privileges to the grantee if necessary.
See Also:
- "GRANT_REMOTE_ADMIN_ACCESS Procedure"
- "Granting Privileges for the XStream Administrator"
- Oracle Database SQL Language Reference for information about the CREATE DIRECTORY SQL statement

GRANT_REMOTE_ADMIN_ACCESS Procedure

This procedure enables a remote XStream administrator to perform administrative actions at the local database by connecting to the grantee using a database link.

Syntax

DBMS_XSTREAM_AUTH.GRANT_REMOTE_ADMIN_ACCESS(
   grantee  IN  VARCHAR2);

Parameters

Table 8-3 GRANT_REMOTE_ADMIN_ACCESS Procedure Parameter

Parameter	Description
`grantee`	The user who allows remote access. The procedure adds the grantee to the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view with `YES` for the `ACCESS_FROM_REMOTE` column. If the user already has an entry in this data dictionary view, then the procedure does not make another entry. Instead, it updates the `ACCESS_FROM_REMOTE` column to `YES`.

Usage Notes

Typically, you run the procedure and specify a grantee at a local source database if a downstream capture process captures changes originating at the local source database. The XStream administrator at a downstream capture database administers the source database using this connection.

Note:

The GRANT_ADMIN_PRIVILEGE procedure in this package runs this procedure.

See Also:

"GRANT_ADMIN_PRIVILEGE Procedure"

REVOKE_ADMIN_PRIVILEGE Procedure

This procedure either revokes XStream administrator privileges from a user directly, or generates a script that revokes these privileges.

Syntax

DBMS_XSTREAM_AUTH.REVOKE_ADMIN_PRIVILEGE(
   grantee            IN  VARCHAR2,  
   revoke_privileges  IN  BOOLEAN   DEFAULT TRUE,
   file_name          IN  VARCHAR2  DEFAULT NULL,
   directory_name     IN  VARCHAR2  DEFAULT NULL);

Parameters

Table 8-4 REVOKE_ADMIN_PRIVILEGE Procedure Parameters

Parameter	Description
`grantee`	The user from whom privileges are revoked
`revoke_privileges`	If `TRUE`, then the procedure revokes the privileges from the specified user directly, and removes the user from the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view. If the user does not have a record in this data dictionary view, then the procedure does not remove a record from the view, and no error is raised. If `TRUE` and any of the revoke statements fails, then the procedure raises an error. A revoke statement fails if the user is not granted the privilege that is being revoked. If `FALSE`, then the procedure does not revoke the privileges from the specified user directly, and does not remove the user from the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view. You specify `FALSE` when the procedure is generating a file that you will edit and then run. If you specify `FALSE` and either the `file_name` or `directory_name` parameter is `NULL`, then the procedure does not raise an error.
`file_name`	The name of the file generated by this procedure. The file contains all of the statements that revoke the privileges. If a file with the specified file name exists in the specified directory name, then the revoke statements are appended to the existing file. If `NULL`, then the procedure does not generate a file.
`directory_name`	The directory into which the generated file is placed. The specified directory must be a directory object created using the SQL statement `CREATE` `DIRECTORY`. If you specify a directory, then the user who invokes the procedure must have the `WRITE` privilege on the directory object. If the `file_name` parameter is `NULL`, then this parameter is ignored, and the procedure does not generate a file. If `NULL` and the `file_name` parameter is non-`NULL`, then the procedure raises an error.

Usage Notes

The user who runs this procedure must be an administrative user who can revoke privileges from other users. Specifically, this procedure revokes the privileges granted by running the GRANT_ADMIN_PRIVILEGE procedure in this package.

Note:

To view all of the statements run by this procedure in detail, you can use the procedure to generate a script and then view the script in a text editor.

See Also:

"GRANT_ADMIN_PRIVILEGE Procedure"
Oracle Database SQL Language Reference for information about the CREATE DIRECTORY SQL statement

REVOKE_REMOTE_ADMIN_ACCESS Procedure

This procedure disables a remote XStream administrator from performing administrative actions by connecting to the grantee using a database link.

Note:

The REVOKE_ADMIN_PRIVILEGE procedure in this package runs this procedure.

See Also:

"REVOKE_ADMIN_PRIVILEGE Procedure"

Syntax

DBMS_XSTREAM_AUTH.REVOKE_REMOTE_ADMIN_ACCESS(
   grantee  IN  VARCHAR2);

Parameters

Table 8-5 REVOKE_REMOTE_ADMIN_ACCESS Procedure Parameter

Parameter Description

Parameter	Description
`grantee`	The user for whom access from a remote XStream administrator is disabled. If a row for the grantee exists in the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view, then the procedure updates the `ACCESS_FROM_REMOTE` column for the grantee to `NO`. If, after this update, both the `LOCAL_PRIVILEGES` column and the `ACCESS_FROM_REMOTE` column are `NO` for the grantee, then the procedure removes the grantee from the view. If no row for the grantee exists in the `DBA_XSTREAM_ADMINISTRATOR` data dictionary view, then the procedure does not update the view and does not raise an error.

grantee

The user for whom access from a remote XStream administrator is disabled.

If a row for the grantee exists in the DBA_XSTREAM_ADMINISTRATOR data dictionary view, then the procedure updates the ACCESS_FROM_REMOTE column for the grantee to NO. If, after this update, both the LOCAL_PRIVILEGES column and the ACCESS_FROM_REMOTE column are NO for the grantee, then the procedure removes the grantee from the view.

If no row for the grantee exists in the DBA_XSTREAM_ADMINISTRATOR data dictionary view, then the procedure does not update the view and does not raise an error.