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https://github.com/fbonalair/traefik-crowdsec-bouncer
A http service to verify request and bounce them according to decisions made by CrowdSec.
https://github.com/fbonalair/traefik-crowdsec-bouncer
container-image crowdsec crowdsec-bouncer go golang security traefik traefik-v2 webapp
Last synced: about 2 months ago
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A http service to verify request and bounce them according to decisions made by CrowdSec.
- Host: GitHub
- URL: https://github.com/fbonalair/traefik-crowdsec-bouncer
- Owner: fbonalair
- License: mit
- Created: 2021-09-28T14:31:04.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-12-18T16:03:30.000Z (9 months ago)
- Last Synced: 2024-06-18T22:59:50.959Z (3 months ago)
- Topics: container-image, crowdsec, crowdsec-bouncer, go, golang, security, traefik, traefik-v2, webapp
- Language: Go
- Homepage:
- Size: 85 KB
- Stars: 257
- Watchers: 4
- Forks: 20
- Open Issues: 22
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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# traefik-crowdsec-bouncer
A http service to verify request and bounce them according to decisions made by CrowdSec.
# Description
This repository aim to implement a [CrowdSec](https://doc.crowdsec.net/) bouncer for the router [Traefik](https://doc.traefik.io/traefik/) to block malicious IP to access your services.
For this it leverages [Traefik v2 ForwardAuth middleware](https://doc.traefik.io/traefik/middlewares/http/forwardauth/) and query CrowdSec with client IP.
If the client IP is on ban list, it will get a http code 403 response. Otherwise, request will continue as usual.
# Demo
## Prerequisites
[Docker](https://docs.docker.com/get-docker/) and [Docker-compose](https://docs.docker.com/compose/install/) installed.
You can use the docker-compose in the examples' folder as a starting point.
Through traefik it exposes the whoami countainer on port 80, with the bouncer accepting and rejecting client IP.
Launch your all services except the bouncer with the follow commands:
```bash
git clone https://github.com/fbonalair/traefik-crowdsec-bouncer.git && \
cd traefik-crowdsec-bouncer/examples && \
docker-compose up -d traefik crowdsec whoami
```
## Procedure
1. Get a bouncer API key from CrowdSec with command `docker exec crowdsec-example cscli bouncers add traefik-bouncer`
2. Copy the API key printed. You **_WON'T_** be able the get it again.
3. Paste this API key as the value for bouncer environment variable `CROWDSEC_BOUNCER_API_KEY`, instead of "MyApiKey"
4. Start bouncer in attach mode with `docker-compose up bouncer`
5. Visit . You will see the container whoami page, copy your IP address from `X-Real-Ip` line (i.e. 192.168.128.1).
In your console, you will see lines showing your authorized request (i.e. "status":200).
6. In another console, ban your IP with command `docker exec crowdsec-example cscli decisions add --ip 192.168.128.1`, modify the IP with your address.
7. Visit again, in your browser you will see "Forbidden" since this time since you've been banned.
Though the console you will see "status":403.
8. Unban yourself with `docker exec crowdsec-example cscli decisions delete --ip 192.168.128.1`
9. Visit one last time, you will have access to the container whoami.
Enjoy!
# Usage
For now, this web service is mainly fought to be used as a container.
If you need to build from source, you can get some inspiration from the Dockerfile.
## Prerequisites
You should have Traefik v2 and a CrowdSec instance running.
The container is available on docker as image `fbonalair/traefik-crowdsec-bouncer`. Host it as you see fit, though it must have access to CrowdSec and be accessible by Traefik.
Follow [traefik v2 ForwardAuth middleware](https://doc.traefik.io/traefik/middlewares/http/forwardauth/) documentation to create a forwardAuth middle pointing to your bouncer host.
Generate a bouncer API key following [CrowdSec documentation](https://doc.crowdsec.net/docs/cscli/cscli_bouncers_add)
## Configuration
The webservice configuration is made via environment variables:
* `CROWDSEC_BOUNCER_API_KEY` - CrowdSec bouncer API key required to be authorized to request local API (required)`
* `CROWDSEC_AGENT_HOST` - Host and port of CrowdSec agent, i.e. crowdsec-agent:8080 (required)`
* `CROWDSEC_BOUNCER_SCHEME` - Scheme to query CrowdSec agent. Expected value: http, https. Default to http`
* `CROWDSEC_BOUNCER_LOG_LEVEL` - Minimum log level for bouncer. Expected value [zerolog levels](https://pkg.go.dev/github.com/rs/zerolog#readme-leveled-logging). Default to 1
* `CROWDSEC_BOUNCER_BAN_RESPONSE_CODE` - HTTP code to respond in case of ban. Default to 403
* `CROWDSEC_BOUNCER_BAN_RESPONSE_MSG` - HTTP body as message to respond in case of ban. Default to Forbidden
* `HEALTH_CHECKER_TIMEOUT_DURATION` - [Golang string represation of a duration](https://pkg.go.dev/time#ParseDuration) to wait for bouncer's answer before failing health check. Default to 2s
* `PORT` - Change listening port of web server. Default listen on 8080
* `GIN_MODE` - By default, run app in "debug" mode. Set it to "release" in production
* `TRUSTED_PROXIES` - List of trusted proxies IP addresses in CIDR format, delimited by ','. Default of 0.0.0.0/0 should be fine for most use cases, but you HAVE to add them directly in Traefik.
## Exposed routes
The webservice exposes some routes:
* GET `/api/v1/forwardAuth` - Main route to be used by Traefik: query CrowdSec agent with the header `X-Real-Ip` as client IP`
* GET `/api/v1/ping` - Simple health route that respond pong with http 200`
* GET `/api/v1/healthz` - Another health route that query CrowdSec agent with localhost (127.0.0.1)`
* GET `/api/v1/metrics` - Prometheus route to scrap metrics
# Contribution
Any constructive feedback is welcome, fill free to add an issue or a pull request. I will review it and integrate it to the code.
## Local Setup
1. Start docker compose with docker-compose up -d
2. Create `_test.env` from template `_test.env.example` such as `cp _test.env.example _test.env`
3. Get an API key for your bouncer with : ` docker exec traefik-crowdsec-bouncer-crowdsec-1 cscli bouncers add traefik-bouncer`
4. In `_test.env` replace `` with the previously generated key
5. Adding a banned IP to your crodwsec instance with : `docker exec traefik-crowdsec-bouncer-crowdsec-1 cscli decisions add -i 1.2.3.4`
6. Run test with `godotenv -f ./_test.env go test -cover`