On Tue, Oct 14, 2014 at 6:10 PM, Chirayu Chiripal <chirayu.chiripal@gmail.com> wrote:

Hi all,

On Tue, Oct 14, 2014 at 2:04 PM, Madhura Jayaratne <madhura.cj@gmail.com> wrote:

Hi all,

Following queries are used to assess whether the logged in user has super, create user and grant privileges respectively. See [1]

SELECT 1 FROM mysql.user LIMIT 1

This is used to see if user is phpMyAdmin superuser and for phpMyAdmin, the super user is the user having read access to `mysql.user`.
 

SELECT 1 FROM INFORMATION_SCHEMA.USER_PRIVILEGES WHERE PRIVILEGE_TYPE = 'CREATE USER' LIMIT 1

SELECT 1 FROM INFORMATION_SCHEMA.USER_PRIVILEGES WHERE IS_GRANTABLE = 'YES' LIMIT 1

However, if I create a user with all global privileges except for 'GRANT', 'SUPER', and 'CREATE USER' privileges all the above queries return 1 since the queries does not check for the grantee column. Rows corresponding to root user make all these queries return 1.

Similarly, USER_PRIVILEGES tells about the global privileges of current logged in user. Even if user is not having Global GRANT privilege he can still grant privileges to user (those privileges which he has), So, he is kind of a GRANT user for phpmyadmin.

I don't know why, but I created a similar user that you have created but using that new user can still create more users using that new user.

I just saw my previous research (for some RFE in which this task was done). Actually, the user needs either of global CREATE_USER or INSERT privileges on mysql table (So he can still create user w/o having global create user).

So each of the queries looks fine to me.

Also, If I am not wrong, GRANTEE is the user from which he got those particular privileges and is not the current user itself.