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Secure DNS Server

This project was implemented as a part of the course ECS235A. In this project, we aim to develop a DNS Server architecture which can mitigate the effects of a DNS Denial of Service attack. Our architecture employs a DNS Gatekeeper server which acts as a proxy between the actual DNS Servers and the user. This Gatekeeper employs IP blocking and simple load-balancing techniques to improve scalability. The complete architecture is given below.

Alt text

Getting Started

The following sections describe how to run the source code and the required setup

Local Setup

Install Python

Install python in your local system, see this.

Install the required dependencies

pip install -r requirements.txt

Run the DNS Servers

THe following command can be used to run the primary and secondary DNS servers.

python3 dns_server.py --port=31111 --zone_file=zones/test_primary.zone --private_key_path=keys/primary.pem

python3 dns_server.py --port=31112 --zone_file=zones/test_secondary.zone --private_key_path=keys/secondary.pem

Run the DNS Gatekeeper

THe following command can be used to run the DNS Gatekeeper.

python3 dns_gatekeeper.py --primary_ns_host=127.0.0.1 --primary_ns_port=31111 --secondary_ns_host=127.0.0.1 --secondary_ns_port=31112 --port=31110

Testing out setup

Our DNS servers and gatekeeper is now running. To test the setup before setting up the attacker, run the required methods in utils/dns_tester.py. Then, simply run the script

cd utils
python3 dns_tester.py

Perform the attack

To start the attacker, simply run the dns_DOS.py script with the required params.

python3 dns_DOS.py --host=127.0.0.1 --port=31110 --timeout=100 --num_threads=10

Containerized setup

Install Docker Desktop

Install Docker Desktop(see this) and enable Kubernetes in the settings. With this, you should be able to run the docker and kubectl commands in your terminal.

Build Docker images

Build all the necessary Docker images using the Dockerfiles.

docker build -t dns_server_primary -f Dockerfile_primary
docker build -t dns_server_secondary . -f Dockerfile_secondary
docker build -t dns_gatekeeper . -f Dockerfile_gatekeeper
docker build -t dns_attacker . -f Dockerfile_attacker

Install the Nginx ingress controller

Apply the Nginx ingress controller configurations.

kubectl apply -f udp_configMap.yaml
kubectl apply -f ingress_nginx.yaml
kubectl apply -f service_ingress.yaml

Install the DNS Server and Gatekeeper configurations

Apply these configurations. Add the script params in the Dockerfiles and deployment configs before doing so.

kubectl apply -f deployment_primary.yaml
kubectl apply -f deployment_secondary.yaml
kubectl apply -f deployment_gatekeeper.yaml
kubectl apply -f deployment_attacker.yaml
kubectl apply -f service_primary.yaml
kubectl apply -f service_secondary.yaml
kubectl apply -f service_gatekeeper.yaml

Utils

The utils/dns_tester.py contains functions for testing our DNS Server setup.

The utils/key_generator.py contains functions for generating the private and public keys required by our servers.