From a security standpoint VFP is a nightmare. You can do pretty much anything on the program end with passwords etc but I never found a way around the fact that you pretty much have to give the client access to the Data directory. VFP being a flat file system (even with the introduction of DBC’s – databases) you had to give the client at the very least read access to the tables and if you wanted him/her to change something then write access too. Only way around that might have been to use VFPOLEDB and a web server but then why use VFP.

Now moving to MYSQL I want to point out some instant benefits you get migrating to MYSQL and that is security. One thing probably not immediatly visible to a newbie is the power of the “DEFINER” and INVOKER security options on stored procedures. This allows clients to do things under certain circumstances that they do have no right to. I want to use the following example to demonstrate the very …

This is the 182nd edition of Log Buffer, the weekly review of database blogs. Make sure to read the whole edition so you do not miss where to submit your SQL limerick!

This week started out with me posting about International Women’s Day, and has me personally attending Confoo (Montreal) which is an excellent conference I hope to return to next year. I learned a lot from confoo, especially the blending nosql and sql session I attended.

This week was also the Hotsos Symposium. …

I had someone point out to me that some of the sample code I have used might be vulnerable to an insertion attack. So I feel it is time to address this subject.

First when using examples I try to just focus on the subject of the current blog and often strip a lot of things that are irrelevant to the point I am trying to make out. But now to the subject of keeping your code save.

If you write and SQL statement looking something like

lc_sql = “SELECT * from customer WHERE custno = ‘” + lc_custno + “‘”

Someone could enter “‘; TRUNCATE TABLE customer;’” resulting in  a SQL statement looking like

SELECT * from customer WHERE custno = ”; TRUNCATE TABLE customer; ”

Which could be quite disasterous. So to avoid this we could use parameterized queries which I cannot as I am using a seperate function to wrap around the SQLEXEC() function to do all kinds of things like …

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 granted the addition CREATE and INSERT privileges is that according to the MySQL documentation ( …

A special extended edition of Tech Messages for 2010-02-20 through 2010-02-24:

• Gartner EXP Worldwide Survey of Nearly 1,600 CIOs Shows IT Budgets in 2010 to be at 2005 Levels
  Virtualization tops the technology priorities.
• Cisco Offers Three-Year, Zero-Percent Financing to U.S. Small and Medium-Sized Businesses -> Cisco News
• Marc Alff's blog: Performance schema overview
  Really interesting stuff for MySQL developers.
• …

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: http://www.securich.com/about.html.

For MySQL University sessions, point your …

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: http://www.securich.com/about.html.

For MySQL University sessions, point your …

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: http://www.securich.com/about.html.

For MySQL University sessions, point your …

How To Set Up MySQL Database Replication With SSL Encryption On Ubuntu 9.10

This tutorial describes how to set up database replication in MySQL using an SSL connection for encryption (to make it impossible for hackers to sniff out passwords and data transferred between the master and slave). MySQL replication allows you to have an exact copy of a database from a master server on another server (slave), and all updates to the database on the master server are immediately replicated to the database on the slave server so that both databases are in sync. This is not a backup policy because an accidentally issued DELETE command will also be carried out on the slave; but replication can help protect against hardware failures though.

It’s worth noting that if you’re using MySQL 5.0/5.1, with SSL enabled, and you’re using yaSSL as opposed to OpenSSL, you’re vulnerable to CVE-2009-4484. Its a buffer overflow, that works over TCP, via the MySQL port, 3306. Lenz furnished us with some information, and the patch is available. You’ll see this rocking when MySQL 5.1.43 gets released.

It affects Debian (presumably, it will also affect Ubuntu). Red Hat/CentOS is spared, because instead of using yaSSL, OpenSSL is used.

MariaDB …