On Tue, Oct 14, 2014 at 6:10 PM, Chirayu Chiripal <
chirayu.chiripal(a)gmail.com> wrote:
Hi all,
On Tue, Oct 14, 2014 at 2:04 PM, Madhura Jayaratne <madhura.cj(a)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.
This obviously looks a bug to me. I'm writing
to make sure that I'm not
missing out on something obvious.
Correct me if I am wrong anywhere. I am doing some more research on it.
[1]
https://github.com/phpmyadmin/phpmyadmin/blob/master/libraries/DatabaseInte…
--
Thanks and Regards,
Madhura Jayaratne
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Regards,
Chirayu Chiripal
https://chirayuchiripal.wordpress.com/