[MDEV-19141] server_audit_excl_users accepts only values with less than 1024 chars Created: 2019-04-02  Updated: 2020-08-25  Resolved: 2019-04-28

Status: Closed
Project: MariaDB Server
Component/s: Plugin - Audit
Affects Version/s: 10.2, 10.3
Fix Version/s: 10.2.24, 10.3.15, 10.4.5

Type: Bug Priority: Major
Reporter: Richard Stracke Assignee: Alexey Botchkov
Resolution: Fixed Votes: 1
Labels: None

Issue Links:
Relates
relates to MDEV-19459 Backport MDEV-17456 to server_audit p... Closed

 Description   

Assigning to server_audit_excl_users seems to be cut at ~ 1024 chars.

To reproduce..

SET GLOBAL server_audit_excl_users = "'root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root3','root4'"

Output for the variables...

SHOW GLOBAL VARIABLES LIKE '%server_audit_excl_users%';

 
SELECT LENGTH("'root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root3'");

User root4 will be cut.

It seems, it will be caused by

#define SHOW_VAR_FUNC_BUFF_SIZE 1024

from MySQL Plugin API

https://dev.mysql.com/doc/refman/8.0/en/plugin-data-structures.html#plugin-status-system-variables

So it be expanded to more than 1024 or throw an error message and documented in the audit plugin documentation.



 Comments   
Comment by Alexey Botchkov [ 2019-04-28 ]

http://lists.askmonty.org/pipermail/commits/2019-April/013695.html

Now we'll launch an error message when try to set too long value to server_audit_incl/excl_users .

Generated at Thu Feb 08 08:49:22 UTC 2024 using Jira 8.20.16#820016-sha1:9d11dbea5f4be3d4cc21f03a88dd11d8c8687422.