Security Functions

gs_password_deadline()

Description: Displays the time before the password of the current account expires. After the password expires, the system prompts the user to change the password. This parameter is related to the GUC parameter password_effect_time.

Return type: interval

Examples:

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

gs_password_expiration()

Description: Displays the time before the password of the current account expires. After the password expires, the user cannot log in to the database. This parameter is related to the DDL statement PASSWORD EXPIRATION period for creating a user. The return value of the function is greater than or equal to -1. If PASSWORD EXPIRATION period is not specified during user creation, the default value is -1, indicating that there is no expiration limit.

Return type: interval

Examples:

    
         SELECT gs_password_expiration();
  gs_password_expiration   
-------------------------
 29 days 23:59:49.731482
(1 row)

login_audit_messages(flag boolean)

Description: Queries login information about a login user.

Return type: tuple

Examples:

Checks the date, time, and IP address successfully authenticated during the last login.

      
           SELECT * FROM login_audit_messages(true);
  username  | database |       logintime        |     type      | result |  client_conninfo   
------------+----------+------------------------+---------------+--------+--------------------
     dbadmin    | gaussdb | 2017-06-02 15:28:34+08 | login_success | ok     | gsql@[local]
(1 row)

Checks the date, time, and IP address that failed to be authenticated during the last login.

      
           SELECT * FROM login_audit_messages(false) ORDER BY logintime desc limit 1;
  username  | database |       logintime        |     type     | result |     client_conninfo     
------------+----------+------------------------+--------------+--------+-------------------------
(0 rows)

Checks the number of failed attempts, date, and time since the previous successful authentication.

      
           SELECT * FROM login_audit_messages(false);
  username  | database |       logintime        |     type     | result |     client_conninfo     
------------+----------+------------------------+--------------+--------+-------------------------
(0 rows)

login_audit_messages_pid(flag boolean)

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

Examples:

Checks the date, time, and IP address successfully authenticated during the last login.

      
           SELECT * FROM login_audit_messages_pid(true);
  username  | database |       logintime        |     type      | result |  client_conninfo | backendid
------------+----------+------------------------+---------------+--------+--------------------
     dbadmin    | postgres | 2017-06-02 15:28:34+08 | login_success | ok     | gsql@[local] | 140311900702464
(1 row)

Checks the date, time, and IP address that failed to be authenticated during the last login.

      
           SELECT * FROM login_audit_messages_pid(false) ORDER BY logintime desc limit 1;
  username  | database |       logintime        |     type     | result |     client_conninfo   | backendid
------------+----------+------------------------+--------------+--------+-------------------------
(0 rows)

Checks the number of failed attempts, date, and time since the previous successful authentication.

      
           SELECT * FROM login_audit_messages_pid(false);
  username  | database |       logintime        |     type     | result |     client_conninfo    | backendid
------------+----------+------------------------+--------------+--------+-------------------------
(0 rows)

pg_query_audit()

Description: Displays audit logs of the CN.

Return type: record

The following table describes return columns.

**Table 1** Fields returned by the **pg_query_audit()** function
Column	Type	Description
begintime	timestamp with time zone	Operation start time
endtime	timestamp with time zone	Operation end time
operation_type	text	Operation type. For details, see Table 2.
audit_type	text	Audit type. For details, see Table 3.
result	text	Operation result
username	text	Name of the user who performs the operation
database	text	Database name
client_conninfo	text	Client connection information, that is, gsql, JDBC, or ODBC.
object_name	text	Object name
command_text	text	Command used to perform the operation
detail_info	text	Operation details
transaction_xid	text	Transaction ID
query_id	text	Query ID
node_name	text	Node name
thread_id	text	Thread ID
local_port	text	Local port
remote_port	text	Remote port

**Table 2** Operation types
Operation Type	Description
audit_switch	Indicates that the operations of enabling and disabling the audit log function are audited.
login_logout	Indicates that user login and log-out operations are audited.
system	Indicates that the system startup, shutdown, and instance switchover operations are audited.
sql_parse	Indicates that SQL statement parsing operations are audited.
user_lock	Indicates that user locking and unlocking operations are audited.
grant_revoke	Indicates that user permission granting and revoking operations are audited.
violation	Indicates that user's access violation operations are audited.
ddl	Indicates that DDL operations are audited. DDL operations are controlled at a fine granularity based on operation objects. Therefore, audit_system_object is used to control the objects whose DDL operations are to be audited. (The audit function takes effect as long as audit_system_object is configured, no matter whether ddl is set.)
dml	Indicates that the DDL operations are audited.
select	Indicates that the SELECT operations are audited.
internal_event	Indicates that internal incident operations are audited.
user_func	Indicates that operations related to user-defined functions, stored procedures, and anonymous blocks are audited.
special_func	Indicates that special function invoking operations are audited. Special functions include pg_terminate_backend and pg_cancel_backend.
copy	Indicates that the COPY operations are audited.
set	Indicates that the SET operations are audited.
transaction	Indicates that transaction operations are audited.
vacuum	Indicates that the VACUUM operations are audited.
analyze	Indicates that the ANALYZE operations are audited.
cursor	Indicates that cursor operations are audited.
anonymous_block	Indicates that the anonymous block operations are audited.
explain	Indicates that the EXPLAIN operations are audited.
show	Indicates that the SHOW operations are audited.
lock_table	Indicates that table lock operations are audited.
comment	Indicates that the COMMENT operations are audited.
preparestmt	Indicates that the PREPARE, EXECUTE, and DEALLOCATE operations are audited.
cluster	Indicates that the CLUSTER operations are audited.
constraints	Indicates that the CONSTRAINTS operations are audited.
checkpoint	Indicates that the CHECKPOINT operations are audited.
barrier	Indicates that the BARRIER operations are audited.
cleanconn	Indicates that the CLEAN CONNECTION operations are audited.
seclabel	Indicates that security label operations are audited.
notify	Indicates that the notification operations are audited.
load	Indicates that the loading operations are audited.

**Table 3** Audit types
Audit type	Description
audit_open/audit_close	Indicates that the audit type is operations enabling or disabling audit logs.
user_login/user_logout	Indicates that the audit type is operations and users with successful login/logout.
system_start/system_stop/system_recover/system_switch	Indicates that the audit type is system startup, shutdown, and instance switchover.
sql_wait/sql_parse	Indicates that the audit type is SQL statement parsing.
lock_user/unlock_user	Indicates that the audit type is successful user locking and unlocking.
grant_role/grant__role	Indicates that the audit type is user permission granting and revoking.
user_violation	Indicates that the audit type is unauthorized user access operations.
ddl_database_object	Indicates that successful DDL operations are audited. DDL operations are controlled at a fine granularity based on operation objects. Therefore, audit_system_object is used to control the objects whose DDL operations are to be audited. (The audit function takes effect as long as audit_system_object is configured, no matter whether ddl is set.) For example, ddl_sequence indicates that the audit type is sequence-related operations.
dml_action_insert/dml_action_delete/dml_action_update/dml_action_merge/dml_action_select	Indicates that the audit type is DML operations such as INSERT, DELETE, UPDATE, and MERGE.
internal_event	Indicates that the audit type is internal events.
user_func	Indicates that the audit type is user-defined functions, stored procedures, or anonymous block operations.
special_func	Indicates that the audit type is special function invocation. Special functions include pg_terminate_backend and pg_cancel_backend.
copy_to/copy_from	Indicates that the audit type is COPY operations.
set_parameter	Indicates that the audit type is SET operations.
trans_begin/trans_commit/trans_prepare/trans_rollback_to/trans_release/trans_savepoint/trans_commit_prepare/trans_rollback_prepare/trans_rollback	Indicates that the audit type is transaction-related operations.
vacuum/vacuum_full/vacuum_merge	Indicates that the audit type is VACUUM operations.
analyze/analyze_verify	Indicates that the audit type is ANALYZE operations.
cursor_declare/cursor_move/cursor_fetch/cursor_close	Indicates that the audit type is cursor-related operations.
codeblock_execute	Indicates that the audit type is anonymous blocks.
explain	Indicates that the audit type is EXPLAIN operations.
show	Indicates that the audit type is SHOW operations.
lock_table	Indicates that the audit type is table locking operations.
comment	Indicates that the audit type is COMMENT operations.
prepare/execute/deallocate	Indicates that the audit type is PREPARE, EXECUTE, or DEALLOCATE operations.
cluster	Indicates that the audit type is CLUSTER operations.
constraints	Indicates that the audit type is CONSTRAINTS operations.
checkpoint	Indicates that the audit type is CHECKPOINT operations.
barrier	Indicates that the audit type is BARRIER operations.
cleanconn	Indicates that the audit type is CLEAN CONNECTION operations.
seclabel	Indicates that the audit type is security label operations.
notify	Indicates that the audit type is notification operations.
load	Indicates that the audit type is loading operations.

pgxc_query_audit()

Description: Displays audit logs of all CNs.

Return type: record

The return fields of this function are the same as those of the pg_query_audit() function.

pg_delete_audit()

Description: Deletes audit logs in a specified period.
Return type: void

For database security concerns, this function is unavailable. If you call it, the following message is displayed: "ERROR: For security purposes, it is not allowed to manually delete audit logs."

      
           SELECT * FROM pg_delete_audit('2023-01-10 17:00:00','2023-01-10 19:00:00');
ERROR:  For security purposes, it is not allowed to manually delete audit logs