This is a 3 part blog series:
To modify users, you must have the CREATE USER privilege or the UPDATE privilege on the mysql schema.…
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With the next version of MySQL that is MySQL 8, there is a very
nice feature of creating "roles" which can be assigned
certain privileges and then these roles can be assigned to users,
thus helping us in maintaining the principle of least
privilege.
It makes our life as developers and DBAs easier as we do not have
to remember what are the specific privileges assigned to
different users. These "roles" can simply be assigned or
de-assigned from users as necessary.
The setup process is pretty easy and intuitive.
1. Create Role:
CREATE ROLE 'read', 'write', 'read_write';
Which essentially …
In this blog, I will provide answers to the Q & A for the Troubleshooting MySQL Access Privileges Issues webinar.
First, I want to thank everybody for attending the February 23 webinar. The recording and slides for the webinar are available here. Below is the list of your questions that I wasn’t able to answer during the webinar, with responses:
Q: Should the root@localhost user be given ALL privileges or Super privileges? Does All include Super privileges also?
A: Yes, you should have a user with all privileges. Better if …
[Read more]In this blog post, we’ll look at how to preserve all MySQL grants and users after reinstalling MySQL.
Every so often, I need to reinstall a MySQL version from scratch and preserve all the user accounts and their permissions (or move the same users and privileges to another server).
As of MySQL 5.7, MySQL does not make this easy! MySQL SHOW GRANTS only shows permissions for one user, and the method suggested on StackExchange – dumping tables containing grants information directly – is not robust (as Rick James mentions in the comments). It also doesn’t work between different MySQL versions.
…
[Read more]
Mermaids have the same probability of fixing
your permission problems, but people continue believing in the
FLUSH PRIVILEGES myth.I see suggesting the usage of FLUSH
PRIVILEGES every time someone writes a tutorial or a
solution to a problem regarding creating a new account or
providing different privileges. For example, the top post on
/r/mysql
as of the writing of these lines, “MySQL:The user specified as a definer does not
exist (error 1449)-Solutions” has multiple guilty cases of
this (Update: the user has corrected those lines
after I posted this article).
It is not my intention to bash that post, but I have seen …
[Read more]We are happy to announce mysqlgrants, a new utility that allows users to display the privileges of grantees over database objects. Together with mysqlbinlogmove, these are the new utilities included in MySQL Utilities release-1.6.0 Alpha.
Mysqlgrants allows you to know which users have access to a specific object or list of objects. Furthermore, it can also show the list of privileges that each user has over said object(s). In short, mysqlgrants simplifies the task of monitoring grants in MySQL helping you ensure users do not have more permissions than necessary, thus keeping data more secure.
Main Features
Below is a summary of the main features of the mysqlgrants utility:
Installed on a clean CentOS 6.4 AWS instance.
sudo su - cd /tmp wget http://cdn.mysql.com/Downloads/MySQL-5.6/MySQL-5.6.13-1.el6.x86_64.rpm-bundle.tar tar xvf MySQL-5.6.13-1.el6.x86_64.rpm-bundle.tar yum install -y libaio perl rpm -i MySQL*.rpm
The following output is the sign that security is being considered with new MySQL versions. Woot!
A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER ! You will find that password in '/root/.mysql_secret'. You must change that password on your first connect, no other statement but 'SET PASSWORD' will be accepted. See the manual for the semantics of the 'password expired' flag. Also, the account for the anonymous user has been removed. In addition, you can run: /usr/bin/mysql_secure_installation which will also give you the option of removing the test database. This is strongly recommended for production servers. See the manual for more instructions. Please report any problems with the …[Read more]
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[Read more]
*************************** 1. row ***************************
Grants for user@host: GRANT USAGE ON *.* TO 'user'@'host' IDENTIFIED BY PASSWORD …
This was a request yesterday on a mailing list about how to I block DROP statements from running on a slave. There were responses including MySQL could not do this, or try other replication technologies however I thought I would share how you can easily do this on a slave.
You simply deny access on the slave. It is as simple as changing the MySQL privileges for the user(s) in question to remove DROP or ALTER capabilities.
Of course this will break replication rather then simply ignore the statement however I suspect that is the intended goal anyway. The first statement that uses the table will fail regardless. With appropriate monitoring of replication you should know in about 15 seconds. (Hint: If you don’t monitor replication or monitor it frequently, DO SO NOW!)
These leads to the question, what if the statements are legitimate? There are several solutions. Enable the specific privileges on the slave when the DBA …
[Read more]I would like to start off by excusing myself for having had a broken link on http://www.securich.com/downloads.html when I published the latest blog post about Securich.
The tool is downloadable from there and anyone can use it for free in accordance to GPLv2.
I wanted to throw out tutorial about how to install it and use it (Note this tutorial is for version securich version 0.1.2):
