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ALTER MASKING POLICY

Updated on 2024-08-20 GMT+08:00

Description

Modifies 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 the security policy is enabled, that is, enable_security_policy is set to on.

Syntax

  • Modify the policy description.
    1
    ALTER MASKING POLICY policy_name COMMENTS policy_comments;
    

  • Modify the masking method.
    1
    ALTER MASKING POLICY policy_name {ADD | REMOVE | MODIFY} masking_actions[, ...];
    

    • The syntax of masking_actions
      1
      masking_function ON LABEL(label_name[, ...])
      

    • The syntax of masking_function
      1
      {maskall | randommasking | creditcardmasking | basicemailmasking | fullemailmasking | shufflemasking | alldigitsmasking | regepmasking}
      

  • Modify the scenarios where the masking policies take effect.
    1
    ALTER MASKING POLICY policy_name MODIFY (filter_group_clause);
    

    • The syntax of filter_group_clause
      1
          FILTER ON { ( FILTER_TYPE ( filter_value [, ... ] ) ) [, ... ] }
      

  • Remove the filters of the masking policies.
    1
    ALTER MASKING POLICY policy_name DROP FILTER;
    

  • Enable or disable the masking policies.
    1
    ALTER MASKING POLICY policy_name {ENABLE | DISABLE};
    

Parameters

  • policy_name

    Specifies the masking policy name, which must be unique.

    Value range: a string. It must comply with the naming convention.

  • policy_comments

    Adds or modifies description of masking policies.

  • masking_function

    Specifies eight preset masking methods or user-defined functions. Schema is supported.

    maskall is not a preset function 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 policies: IP, ROLES, and APP.

  • filter_value

    Indicates 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

  • Modify the policy description.
    -- Create table tb_for_masking.
    gaussdb=# CREATE TABLE tb_for_masking(idx int, col1 text, col2 text, col3 text, col4 text, col5 text, col6 text, col7 text,col8 text);
    
    -- Insert data into the tb_for_masking table.
    gaussdb=# INSERT INTO tb_for_masking VALUES(1, '9876543210', 'usr321usr', 'abc@huawei.com', 'abc@huawei.com', '1234-4567-7890-0123', 'abcdef 123456 ui 323 jsfd321 j3k2l3', '4880-9898-4545-2525', 'this is a llt case'); 
    
    -- View data.
    gaussdb=# SELECT * FROM tb_for_masking;
     idx |    col1    |   col2    |      col3      |      col4      |        col5         |                col6           
          |        col7         |        col8        
    -----+------------+-----------+----------------+----------------+---------------------+-------------------------------
    ------+---------------------+--------------------
       1 | 9876543210 | usr321usr | abc@huawei.com | abc@huawei.com | 1234-4567-7890-0123 | abcdef 123456 ui 323 jsfd321 j
    3k2l3 | 4880-9898-4545-2525 | this is a llt case
    (1 row)
    
    -- Create a resource label for sensitive column col1.
    gaussdb=# CREATE RESOURCE LABEL mask_lb1 ADD COLUMN(tb_for_masking.col1);
    
    -- Create a data masking policy named maskpol1.
    gaussdb=# CREATE MASKING POLICY maskpol1 maskall ON LABEL(mask_lb1);
    
    -- Add description for masking policy maskpol1.
    gaussdb=# ALTER MASKING POLICY maskpol1 COMMENTS 'masking policy for tb_for_masking.col1';
    
    -- View the description of data masking policy maskpol1.
    gaussdb=# SELECT * FROM GS_MASKING_POLICY;                
     polname  |              polcomments               |         modifydate         | polenabled 
    ----------+----------------------------------------+----------------------------+------------
     maskpol1 | masking policy for tb_for_masking.col1 | 2023-11-07 16:38:31.607374 | t
    (1 row)
  • Modify a masking policy.
    -- Create a resource label for sensitive column col2.
    gaussdb=# CREATE RESOURCE LABEL mask_lb2 ADD COLUMN(tb_for_masking.col2);
    
    -- Add the randommasking masking mode to the masking policy maskpol1.
    gaussdb=# ALTER MASKING POLICY maskpol1 ADD randommasking ON LABEL(mask_lb2);
    
    -- Access the tb_for_masking table. The masking policy is triggered for the col2 column.
    gaussdb=# SELECT col2 FROM tb_for_masking;
        col2   
    ------------
     27e8da66cc
    (1 row)
    
    -- Remove the randommasking masking mode from the masking policy maskpol1.
    gaussdb=# ALTER MASKING POLICY maskpol1 REMOVE randommasking ON LABEL(mask_lb2);
    
    -- Access the tb_for_masking table. The data in the col2 column is not masked, indicating that the masking mode randommasking is invalid.
    gaussdb=# SELECT col2 FROM tb_for_masking;
       col2    
    -----------
     usr321usr
    (1 row)
    
    -- Change the masking mode of the masking policy maskpol1 to randommasking.
    gaussdb=# ALTER MASKING POLICY maskpol1 MODIFY randommasking ON LABEL(mask_lb1);
    
    -- Access the tb_for_masking table. The masking policy is triggered for the col1 column.
    gaussdb=# SELECT col1 FROM tb_for_masking;
        col1    
    ------------
     5a03debac1
    (1 row)
    
  • Modify the scenarios where the masking policies take effect.
    -- Create users dev_mask and bob_mask.
    gaussdb=# CREATE USER dev_mask PASSWORD '********';
    gaussdb=# CREATE USER bob_mask PASSWORD '*********';
    
    -- Create a resource label for sensitive column col8.
    gaussdb=# CREATE RESOURCE LABEL mask_lb8 ADD COLUMN(tb_for_masking.col8); 
    
    -- Create a data masking policy named maskpol8.
    gaussdb=# CREATE MASKING POLICY maskpol8 randommasking ON LABEL(mask_lb8) FILTER ON ROLES(dev_mask, bob_mask), APP(gsql), IP('172.31.17.160', '127.0.0.0/24');
    
    -- Modify the filtering information by specifying ROLES of data masking policy maskpol8.
    gaussdb=# ALTER MASKING POLICY maskpol1 MODIFY (FILTER ON ROLES(dev_mask));
    
    -- Check tb_for_masking as the dev_mask user.
    gaussdb=# GRANT ALL PRIVILEGES TO dev_mask;
    
    -- Access the tb_for_masking table. The masking policy is triggered for the col8 column.
    gaussdb=# SELECT col8 FROM tb_for_masking;
            col8        
    --------------------
     f134e06ef528013b46
    (1 row)
    
  • Remove the filters of the masking policies for the policies to take effect.
    gaussdb=# ALTER MASKING POLICY maskpol1 DROP FILTER;
  • Disable a masking policy.
    -- Disable masking policy maskpol1.
    gaussdb=# ALTER MASKING POLICY maskpol1 DISABLE;
    
    -- Check the status of data masking policy maskpol1. If the value of polenabled is f, the data masking policy is disabled successfully.
    gaussdb=# SELECT * FROM GS_MASKING_POLICY;
     polname  | polcomments |         modifydate         | polenabled 
    ----------+-------------+----------------------------+------------
     maskpol1 |             | 2023-11-07 17:22:54.594111 | f
  • Delete data.
    -- Delete a masking policy.
    gaussdb=# DROP MASKING POLICY maskpol1, maskpol8;
    
    -- Delete a resource label.
    gaussdb=# DROP RESOURCE LABEL mask_lb1, mask_lb2, mask_lb8;
    
    -- Delete the tb_for_masking table.
    gaussdb=# DROP TABLE tb_for_masking;
    
    -- Delete the dev_mask and bob_mask users.
    gaussdb=# DROP USER dev_mask, bob_mask;
    

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