CombiWAF is a research application for the robust combination of web application firewalls (WAFs) . The main idea is that every WAF has weaknesses in different fields and by combining them, we can increase the security of the protected web server. The system consists of two parts:
The reference implementation is written in Go and runs on Linux/Unix and macOS systems.
git clone TODOor
go build -o ../bin/combiwaf combiwaf.go.
To start the daemons, run
combiwaf -distributor for the distributor or
for the combiner. The PID will be written in the distributor.pid or combiner.pid file.
To kill a process, you can run e.g.
kill `cat distributor.pid`.
Running the program without arguments shows the possible parameters with a
short explanation. You can run both components on different servers, of course.
Note: You can use both command line styles
||Starts the distributor as a daemon. See distributor.log and distributor.pid for details.|
||Starts the combiner as a daemon. See combiner.log and combiner.pid for details.|
||8080||External port to listen. This is the port for the incoming external requests.|
||10000||Timeout in milliseconds. Defines how long the distributor should wait for external connections before closing the connection without response.|
||10000||WAF timeout in milliseconds. Defines how long the distributor should wait for a response from a WAF.|
||false||Defines whether the distributor accepts SSL encrypted requests (HTTPS).|
||Certification file for the SSL connection.|
||Private key file for the SSL connection.|
||Comma-separated list of all WAFs with port like waf1.net:80,waf2.net:80,waf3.net:8080. Defines the WAFs to which an external request will be forwarded.|
||8080||External port to listen. This is the port for the requests from the WAFs.|
||10000||Timeout in milliseconds. Defines how long the combiner should wait after receiving the first packet with a new UID before proceeding.|
||2||Minimum requests count for the combiner to proceed with a logic request.|
||The web server address with port like example.com:80. Defines the protected web server to which\nthe request should be forwarded.|
||Comma-separated list of all WAFs with port like waf1.net:80,waf2.net:80,waf3.net:8080. Defines from which WAFs the combiner will receive requests.|
Start the distributor (here as superuser because we want to bind to port 80)
combiwaf -distributor -port=80 -timeout=6000 -waf-timeout=5000 -wafs=waf1.internal:80,waf2.internal:80,waf3.internal:80
Start the combiner
combiwaf -combiner -port=8080 -timeout=2500 -min-combiner-requests=2 -web-server=webserver.local:80 -wafs=waf1.internal:80,waf2.internal:80,waf3.internal:80
Configure the used WAFs to forward the requests not to the web server, but to the combiner instead. (From the perspective of every WAF, the combiner is the web server.)
Configure the network so that only the distributor port is publicly available.
This project was developed side-by-side with the EvaluWAF project for automatic, periodic evaluations of WAFs in different combination modes.
If you are interested or have further questions, please contact EvaluWAF .