ingress-nginx-safeline

Ingress-nginx plugin for Chaitin SafeLine Web Application Firewall (WAF). This plugin is used to protect your API from malicious requests. It can be used to block requests that contain malicious content in the request body, query parameters, headers, or URI.

Safeline Prepare

The detection engine of the SafeLine provides services by default via Unix socket. We need to modify it to use TCP, so it can be called by the t1k plugin.

1.Navigate to the configuration directory of the SafeLine detection engine:

cd /data/safeline/resources/detector/

2.Open the detector.yml file in a text editor. Modify the bind configuration from Unix socket to TCP by adding the following settings:

bind_addr: 0.0.0.0
listen_port: 8000

These configuration values will override the default settings in the container, making the SafeLine engine listen on port 8000.

3.Next, map the container’s port 8000 to the host machine. First, navigate to the SafeLine installation directory:

cd /data/safeline

4.Open the compose.yaml file in a text editor and add the ports field to the detector container to expose port 8000:

...
detect:
  ports:
    - 8000:8000
...

5.Save the changes and restart SafeLine with the following commands:

docker-compose down
docker-compose up -d

This will apply the changes and activate the new configuration.

Plugin Usage

Step 1: Install the plugin

way 1: Build your own ingress-nginx/controller image with the plugin installed.

FROM registry.k8s.io/ingress-nginx/controller:v1.10.1

USER root

RUN apk add --no-cache make gcc unzip wget

# install luaroncks
RUN wget https://luarocks.org/releases/luarocks-3.11.0.tar.gz && \
    tar zxpf luarocks-3.11.0.tar.gz && \
    cd luarocks-3.11.0 && \
    ./configure && \
    make && \
    make install && \
    cd .. && \
    rm -rf luarocks-3.11.0 luarocks-3.11.0.tar.gz

RUN luarocks install ingress-nginx-safeline && \
    ln -s /usr/local/share/lua/5.1/safeline /etc/nginx/lua/plugins/safeline

USER www-data

way 2: Use the chaitin ingress-nginx-controller image.

replace image ingress-nginx-controller with docker.io/chaitin/ingress-nginx-controller:v1.10.1 in your deployment.

Step 2: Configure the plugin

use a ConfigMap to configure the plugin

apiVersion: v1
kind: ConfigMap
metadata:
  name: safeline
  namespace: default
data:
  host: "YOUR_DETECTOR_HOST"
  port: "YOUR_DETECTOR_PORT"

Step 3: Configure the ingress-controller

inject env SAFELINE_HOST and SAFELINE_PORT to the ingress-controller deployment

...
env:
  - name: SAFELINE_HOST
    valueFrom:
      configMapKeyRef:
        name: safeline
        key: host
  - name: SAFELINE_PORT
    valueFrom:
      configMapKeyRef:
        name: safeline
        key: port
...            

Step 3: Enable the plugin

enable safeline plugin in configmap

apiVersion: v1
data:
  allow-snippet-annotations: "false"
  plugins: "safeline"
kind: ConfigMap
metadata:
  name: ingress-nginx-controller
  namespace: default

Step 4: Set externalTrafficPolicy to Local

by default, the ingress-nginx-controller service is of type LoadBalancer, which means the source IP of the request will be the IP of the LoadBalancer. If you want to get the real source IP, you can set the externalTrafficPolicy to Local.

Step 5: Test the plugin

use a simple http sql injection test

curl -X POST http://localhost/ -d "select * from users where id=1 or 1=1" 

you should get a 403 response.

{"code": 403, "success":false, "message": "blocked by Chaitin SafeLine Web Application Firewall", "event_id": "b53eb5b95796475699c52a019abb8e6a"}