ALTER MASKING POLICY

Description

Alters a masking policy.

Precautions

• Only users with the POLADMIN or SYSADMIN permission, or the initial user can perform this operation.
• The masking policy takes effect only after enable_security_policy is enabled.

Syntax

• Modify the policy description.

  1	ALTER MASKING POLICY policy_name COMMENTS policy_comments;

• Modify the masking method.

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  ALTER MASKING POLICY policy_name [ADD | REMOVE | MODIFY] masking_actions[, ...]*; The syntax of masking_action: masking_function ON LABEL(label_name[, ...]*)

• Modify the scenarios where the masking policy takes effect.

  1	ALTER MASKING POLICY policy_name MODIFY(FILTER ON FILTER_TYPE(filter_value[, ...]*)[, ...]*);

• Remove the filters of the masking policy.

  1	ALTER MASKING POLICY policy_name DROP FILTER;

• Enable or disable the masking policy.

  1	ALTER MASKING POLICY policy_name [ENABLE | DISABLE];

Parameters

• policy_name

  Specifies the name of a masking policy, which must be unique.

  Value range: a string that complies with the Identifier Naming Conventions.

• policy_comments

  Adds or modifies description of the masking policy.

• masking_function

  Specifies eight preset masking methods or user-defined functions. Schemas are supported.

  The maskall function is not preset. It is hard-coded and cannot be displayed by running \df.

  The masking methods during presetting are as follows:

  maskall | randommasking | creditcardmasking | basicemailmasking | fullemailmasking | shufflemasking | alldigitsmasking | regexpmasking 

• label_name

  Specifies the resource label name.

• FILTER_TYPE

  Specifies the types of information to be filtered by the masking policy, including IP, ROLES, and APP.

• filter_value

  Specifies the detailed information to be filtered, such as the IP address, app name, and username.

• ENABLE|DISABLE

  Enables or disables the masking policy. If ENABLE|DISABLE is not specified, ENABLE is used by default.

Examples

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-- Create users dev_mask and bob_mask.
openGauss=# CREATE USER dev_mask PASSWORD '********';
openGauss=# CREATE USER bob_mask PASSWORD '********';

-- Create table tb_for_masking.
openGauss=# CREATE TABLE tb_for_masking(col1 text, col2 text, col3 text);

-- Create a resource label for sensitive column col1.
openGauss=# CREATE RESOURCE LABEL mask_lb1 ADD COLUMN(tb_for_masking.col1);

-- Create a resource label for sensitive column col2.
openGauss=# CREATE RESOURCE LABEL mask_lb2 ADD COLUMN(tb_for_masking.col2);

-- Create a masking policy for the operation of accessing sensitive column col1.
openGauss=# CREATE MASKING POLICY maskpol1 maskall ON LABEL(mask_lb1);

-- Add description for masking policy maskpol1.
openGauss=# ALTER MASKING POLICY maskpol1 COMMENTS 'masking policy for tb_for_masking.col1';

-- Modify masking policy maskpol1 to add a masking method.
openGauss=# ALTER MASKING POLICY maskpol1 ADD randommasking ON LABEL(mask_lb2);

-- Modify masking policy maskpol1 to remove a masking method.
openGauss=# ALTER MASKING POLICY maskpol1 REMOVE randommasking ON LABEL(mask_lb2);

-- Modify masking policy maskpol1 to modify a masking method.
openGauss=# ALTER MASKING POLICY maskpol1 MODIFY randommasking ON LABEL(mask_lb1);

-- Modify masking policy maskpol1 so that it takes effect only for scenarios where users are dev_mask and bob_mask, the client tool is gsql, and the IP addresses are 10.20.30.40 and 127.0.0.0/24.
openGauss=# ALTER MASKING POLICY maskpol1 MODIFY (FILTER ON ROLES(dev_mask, bob_mask), APP(gsql), IP('10.20.30.40', '127.0.0.0/24'));

-- Modify masking policy maskpol1 so that it takes effect for all user scenarios.
openGauss=# ALTER MASKING POLICY maskpol1 DROP FILTER;

-- Disable masking policy maskpol1.
openGauss=# ALTER MASKING POLICY maskpol1 DISABLE;

-- Drop a masking policy.
openGauss=# DROP MASKING POLICY maskpol1;

-- Drop resource labels.
openGauss=# DROP RESOURCE LABEL mask_lb1, mask_lb2;

-- Drop the tb_for_masking table.
openGauss=# DROP TABLE tb_for_masking;

-- Drop the dev_mask and bob_mask users.
openGauss=# DROP USER dev_mask, bob_mask;

Helpful Links

CREATE MASKING POLICY and DROP MASKING POLICY