Nginx
=====

A role to install and configure Nginx.

## Dependencies

Run this role after you have installed fail2ban.

## Variables

| Name | Default | Notes |
|--|--|--|
| `nginx_port` | `80` | Listen port for Nginx |
| `nginx_package_name` | `nginx-full` | Name of the Debian package to install |
| `nginx_bad_client_ip` | | List of IP address to deny access |
| `nginx_type` | | `gateway` for a Reverse Proxy, `standalone` for a frontend webserver, `backend` for a backend webserver (behind a Reverse Proxy) |
| `nginx_proxy_headers_hash_bucket_size` | `64` | |
| `nginx_http_version` | `1.1` | [documentation](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version) |
| `nginx_gzip` | | [documentation](https://nginx.org/en/docs/http/ngx_http_gzip_module.html) |
| `nginx_gzip_types` | --> `defaults/main.yaml` | |
| `nginx_server_tokens` | `off` | |
| `nginx_access_log` | `off` | Path and configuration for access log |
| `dhparam_path` | `/etc/ssl/private/dhparam.pem` | Path to dhparam file |
| `dhparam_size` | `4096` | Size (in bits) of the generated DH-params |

## Rate limiting
### Limiting the Request Rate

You can use Nginx' [Rate Limiting](https://www.nginx.com/blog/rate-limiting-nginx/) to slow down brute force attacks.
The following zones are available:

| Zone name | Filter | Limit |
|--|--|--|
| `req_ip_one` | IP address | 10r/s |
| `req_ip_two` | IP address | 1r/s |
| `req_server_one` | Domain | 10r/s |
| `req_server_two` | Domain | 1r/s |

Add such a zone to your `server` or `location` block:
```Shell
limit_req zone=req_ip_one burst=5 nodelay;
```

### Limiting the Number of Connections

You can also limit the number of [connection](https://docs.nginx.com/nginx/admin-guide/security-controls/controlling-access-proxied-http/):

| Zone name | Filter | Limit |
|--|--|--|
| `con_ip_one` | IP address | No default limit |

## Bad Bot Blocker

This roles uses a deny list from the [nginx-ultimate-bad-bot-blocker](https://github.com/mitchellkrogza/nginx-ultimate-bad-bot-blocker) repository.

Include the list in your `server` block with:
```Shell
if ($bad_bots = 1) {return 444;}
```