Security Functions

Security Functions

• gs_encrypt_aes128(encryptstr,keystr)

  Description: Encrypts encryptstr strings using keystr as the key and returns encrypted strings. The value of keystr ranges from 8 to 16 bytes and contains at least three types of the following characters: uppercase letters, lowercase letters, digits, and special characters.

  Return type: text

  Length of the return value: At least 92 bytes and no more than (4*[Len/3]+68) bytes, where Len indicates the length of the data before encryption (unit: byte).

  Example:

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  openGauss=# SELECT gs_encrypt_aes128('MPPDB','Asdf1234'); gs_encrypt_aes128 ------------------------------------------------------------------------------------- gwditQLQG8NhFw4OuoKhhQJoXojhFlYkjeG0aYdSCtLCnIUgkNwvYI04KbuhmcGZp8jWizBdR1vU9CspjuzI0lbz12A= (1 row)

  

  A decryption password is required during the execution of this function. For security purposes, the gsql tool does not record the SQL statements containing the function name in the execution history. That is, the execution history of this function cannot be found in gsql by paging up and down.

• gs_encrypt(encryptstr,keystr, encrypttype)

  Description: Encrypts encryptstr strings using keystr as the key and returns encrypted strings based on encrypttype. The value of keystr contains 8 to 16 bytes and at least three types of the following characters: uppercase letters, lowercase letters, digits, and special characters. The value of encrypttype can be aes128 or sm4.

  Return type: text

  Example:

  openGauss=#  SELECT gs_encrypt('MPPDB','Asdf1234','sm4'); 
           gs_encrypt         
   ------------------------------
   ZBzOmaGA4Bb+coyucJ0B8AkIShqc
  (1 row)

  

  A decryption password is required during the execution of this function. For security purposes, the gsql tool does not record the SQL statements containing the function name in the execution history. That is, the execution history of this function cannot be found in gsql by paging up and down.

• gs_decrypt_aes128(decryptstr,keystr)

  Description: Decrypts decrypt strings using keystr as the key and returns decrypted strings. The keystr used for decryption must be consistent with that used for encryption. keystr cannot be empty.

  

  This parameter needs to be used with the gs_encrypt_aes128 encryption function.

  Return type: text

  Example:

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  openGauss=# SELECT gs_decrypt_aes128('gwditQLQG8NhFw4OuoKhhQJoXojhFlYkjeG0aYdSCtLCnIUgkNwvYI04KbuhmcGZp8jWizBdR1vU9CspjuzI0lbz12A=','1234'); gs_decrypt_aes128 ------------------- MPPDB (1 row)

  

  A decryption password is required during the execution of this function. For security purposes, the gsql tool does not record the SQL statements containing the function name in the execution history. That is, the execution history of this function cannot be found in gsql by paging up and down.

• gs_decrypt(decryptstr, keystr, decrypttype)

  Description: Decrypts decrypt strings using keystr as the key and returns decrypted strings based on decrypttype. The decrypttype and keystr used for decryption must be consistent with those used for encryption. The value of keystr cannot be empty. The value of decrypttype can be aes128 or sm4.

  This function needs to be used with the gs_encrypt encryption function.

  Return type: text

  Example:

  openGauss=# select gs_decrypt('ZBzOmaGA4Bb+coyucJ0B8AkIShqc','Asdf1234','sm4');
   gs_decrypt 
  ------------
   MPPDB
  (1 row)

  

  A decryption password is required during the execution of this function. For security purposes, the gsql tool does not record the SQL statements containing the function name in the execution history. That is, the execution history of this function cannot be found in gsql by paging up and down.

• gs_password_deadline

  Description: Indicates the number of remaining days before the password of the current user expires.

  Return type: interval

  Example:

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  openGauss=# SELECT gs_password_deadline(); gs_password_deadline ------------------------- 83 days 17:44:32.196094 (1 row)

• gs_password_notifytime()

  Description: Specifies the number of days prior to password expiration that a user will receive a reminder.

  Return type: int32

• login_audit_messages(BOOLEAN)

  Description: Queries login information about a login user.

  Return type: tuple

  Example:

  • Check the date, time, and IP address of the last successful login.

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    openGauss=> select * from login_audit_messages(true); username | database | logintime | mytype | result | client_conninfo ----------+----------+------------------------+---------------+--------+----------------- omm | openGauss | 2020-06-29 21:56:40+08 | login_success | ok | gsql@[local] (1 row)

  • Check the number, date, and time of failed attempts since the previous successful login.

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    openGauss=> select * from login_audit_messages(false); username | database | logintime | mytype | result | client_conninfo ----------+----------+------------------------+--------------+--------+------------------- omm | openGauss | 2020-06-29 21:57:55+08 | login_failed | failed | [unknown]@[local] omm | openGauss | 2020-06-29 21:57:53+08 | login_failed | failed | [unknown]@[local] (2 rows)

• login_audit_messages_pid

  Description: Queries login information about a login user. Different from login_audit_messages, this function queries login information based on backendid. Information about subsequent logins of the same user does not alter the query result of previous logins and cannot be found using this function.

  Return type: tuple

  

  When the thread pool is enabled, backendid obtained in the same session may change due to thread switchover. As a result, the return values are different when the function is called for multiple times. You are not advised to call this function when the thread pool is enabled.

  Example:

  • Check the date, time, and IP address of the last successful login.

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    openGauss=> SELECT * FROM login_audit_messages_pid(true); username | database | logintime | mytype | result | client_conninfo | backendid ----------+----------+------------------------+---------------+--------+-----------------+----------------- omm | openGauss | 2020-06-29 21:56:40+08 | login_success | ok | gsql@[local] | 139823109633792 (1 row)

  • Check the number, date, and time of failed attempts since the previous successful login.

    1 2 3 4 5 6

    openGauss=> SELECT * FROM login_audit_messages_pid(false); username | database | logintime | mytype | result | client_conninfo | backendid ----------+----------+------------------------+--------------+--------+-------------------+----------------- omm | openGauss | 2020-06-29 21:57:55+08 | login_failed | failed | [unknown]@[local] | 139823109633792 omm | openGauss | 2020-06-29 21:57:53+08 | login_failed | failed | [unknown]@[local] | 139823109633792 (2 rows)

• inet_server_addr

  Description: Displays the server IP address.

  Return type: inet

  Example:

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  openGauss=# SELECT inet_server_addr(); inet_server_addr ------------------ 10.10.0.13 (1 row)

  

  • The client IP address 10.10.0.50 and server IP address 10.10.0.13 are used as an example.
  • If the database is connected to the local PC, the value is empty.
• inet_client_addr

  Description: Displays the client IP address.

  Return type: inet

  Example:

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  openGauss=# SELECT inet_client_addr(); inet_client_addr ------------------ 10.10.0.50 (1 row)

  

  • The client IP address 10.10.0.50 and server IP address 10.10.0.13 are used as an example.

  • If the database is connected to the local PC, the value is empty.
• pg_query_audit

  Description: Views audit logs of the primary database node.

  Return type: record

  The following table describes return fields.

  Name	Type	Description
  time	timestamp with time zone	Operation time
  type	text	Operation
  result	text	Operation result
  userid	oid	User ID
  username	text	Name of the user who performs the operation
  database	text	Database name
  client_conninfo	text	Client connection information
  object_name	text	Object name
  detail_info	text	Operation details
  node_name	text	Node name
  thread_id	text	Thread ID
  local_port	text	Local port
  remote_port	text	Remote port

  For details about how to use the function and details about function examples, see Querying Audit Results.

• pg_delete_audit

  Description: Deletes audit logs in a specified period.
  Return type: void
  For details about how to use the function and details about function examples, see Maintaining Audit Logs.