GreenSQL is free software and is used to prevent successful attacks on SQL databases. GreenSQL is a firewall for database server and is interacting like a proxy between the applications which need the databases and the DB server itself. It analyses SQL commands and has two modes:
- Simulation – Reports suspicious queries to the administrator
- Blocking – Blocks suspicious queries by itself
The software is endowed with a mode, that allows it to “learn” to distinguish between safe and unsafe queries. This is managed by Whitelists. So the administrator should always be very carefully when checking the this list.
Official Project Website: http://www.greensql.net/
Source: Heise Online – Freie Datenbank-Firewall schützt PostgreSQL und MySQL