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Showing entries 1 to 9

Displaying posts with tag: grant (reset)

MySQL privileges and replication
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This is a response on MySQL security: inconsistencies and Less known facts about MySQL user grants.

As far as I know the privilege to grant PROXY privileges is also not very well understood. I blogged about that some time ago.

In addion to the already highlighted issues with GRANT replication and grants can very well create an unwanted situation:

master> SHOW GRANTS FOR 'user'@'host'\G
*************************** 1. row ***************************
Grants for user@host: GRANT USAGE ON *.* TO 'user'@'host' IDENTIFIED BY PASSWORD







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MySQL – changing a user password
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Disclaimer:

This post is for educational purposes only and no responsibility will be taken if you execute any of the commands. You mess it, you fix it!

Replacing a password for a user on MySQL can be done in at least four ways. Three ways at least.

1. set password for ‘user’@'host’=password(‘abc’);

2. grant usage on *.* to ‘user’@'host’ identified by ‘abc’;

3. update mysql.user set password=password(‘abc’) where user=’user’ and host=’host’;

mysql Wed Mar  9 14:27:17 2011 > set password for 'dc'@'%' = password('d');
Query OK, 0 rows affected (0.00 sec)

mysql Wed Mar  9 14:27:39 2011 > show grants for 'dc'@'%';
+---------------------------------------------------------------------------------------------------+
| Grants for dc@%
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When the ALTER TABLE privilege is not enough to run ALTER TABLE
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I recently granted ALTER access in MySQL so a user could run the ALTER TABLE command . However after I granted the necessary privileges, the user was still not able to perform the tasks needed. Reproducing the issue using a test instance, I granted a test user the required privileges and MySQL reported no errors or warnings when the ALTER TABLE was run:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.1.41-log MySQL Community Server (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> grant alter,create,insert on *.* to 'test'@localhost;
Query OK, 0 rows affected (0.00 sec)

mysql> show warnings;
Empty set (0.00 sec)

mysql> show errors;
Empty set (0.00 sec)

mysql>

The reason I


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MySQL University: Securich - Security Plugin for MySQL
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This Thursday (February 25th, 13:00 UTC - way earlier than usual!), Darren Cassar will present Securich - Security Plugin for MySQL. According to Darren, the author of the plugin, Securich is an incredibly handy and versatile tool for managing user privileges on MySQL through the use of roles. It basically makes granting and revoking rights a piece of cake, not to mention added security it provides through password expiry and password history, the customization level it permits, the fact that it runs on any MySQL 5.0 or later and it's easily deployable on any official MySQL binary, platform independent.
More information here:

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MySQL University: Securich - Security Plugin for MySQL
Employee +0 Vote Up -0Vote Down

This Thursday (February 25th, 13:00 UTC - way earlier than usual!), Darren Cassar will present Securich - Security Plugin for MySQL. According to Darren, the author of the plugin, Securich is an incredibly handy and versatile tool for managing user privileges on MySQL through the use of roles. It basically makes granting and revoking rights a piece of cake, not to mention added security it provides through password expiry and password history, the customization level it permits, the fact that it runs on any MySQL 5.0 or later and it's easily deployable on any official MySQL binary, platform independent.
More information here:

  [Read more...]
MySQL University: Securich - Security Plugin for MySQL
Employee +0 Vote Up -0Vote Down

This Thursday (February 25th, 13:00 UTC - way earlier than usual!), Darren Cassar will present Securich - Security Plugin for MySQL. According to Darren, the author of the plugin, Securich is an incredibly handy and versatile tool for managing user privileges on MySQL through the use of roles. It basically makes granting and revoking rights a piece of cake, not to mention added security it provides through password expiry and password history, the customization level it permits, the fact that it runs on any MySQL 5.0 or later and it's easily deployable on any official MySQL binary, platform independent.
More information here:

  [Read more...]
Securich – 0.1.4
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Just a small note to advise that Securich reached 0.1.4.
Some new tools include:
* Added Password complexity
* Enhanced `set_password` – Old password is now necessary to replace it by a new one
* Enhanced Revoke privileges to accept regexp
* Added Block user@hostname on a database level
* Added Creation of reserved usernames
* Added Help stored procedure displays help for each stored proc
* Enhanced `create_update_role` to include the removal of privilages from roles
* Enhanced `grant_priveleges` on `alltables` for a database without tables would terminate with an error instead of gracefully (now fixed)
* Added Restore user@hostname on a database level
* Removed ’show warnings’ from sql installation

The database design using workbench












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My Two Cents on MySQL Password Security
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Lenz Grimmer recently wrote two blogs about password security on MySQL. Both are worth reading in detail. You’ll find them in Basic MySQL Security: Providing passwords on the command line and More on MySQL password security.

Although I wrote a comment on the latter one, there is one point I thought was worth its own blog.

GRANT … IDENTIFIED BY PASSWORD…

You can work around having to specify the password in the open following these steps:

  • Use a local or non-public instance (for example using MySQL Sandbox) to define the user / password combination you need:
    CREATE USER 'name'@'host' IDENTIFIED BY 'secret';
  •   [Read more...]
    Creative SQL: How to Easily SHOW GRANTS for Many Users
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    Scenario: Someone wants to know which of the over 50 MySQL users have certain privileges.

    There are many ways to solve this problem. Some of these scenarios are tedious and repetitious, others take no time at all.

    The issue, of course, lies in what the “certain” privileges are. If it is “who has the SUPER privilege?” then a simple

    SELECT user,host FROM mysql.user WHERE Super_priv='Y';

    is sufficient. If it is “who has write access to the foo database”, you might write:

    SELECT user,host FROM db WHERE Db='foo' AND Select_priv='Y';

    but that only shows who explicitly has read permissions on that database; it does not include those who have global read permissions. The full query would be:
    (more…)

    Showing entries 1 to 9

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