# Apache

## Overview

Alliance Auth gets served using a Web Server Gateway Interface (WSGI) script. This script passes web requests to Alliance Auth which generates the content to be displayed and returns it. This means very little has to be configured in Apache to host Alliance Auth.

If you're using a small VPS to host services with very limited memory, consider using [NGINX](nginx.md).

## Installation

Ubuntu 1804, 2004:
```bash
apt-get install apache2
```

CentOS 7:
```bash
yum install httpd
```
Centos Stream 8, Stream 9
```bash
dnf install httpd
```

CentOS 7, Stream 8, Stream 9
```bash
systemctl enable httpd
```

```bash
systemctl start httpd
```
## Configuration

Apache needs to be able to read the folder containing your auth project's static files.
Ubuntu 1804, 2004:
```
chown -R www-data:www-data /var/www/myauth/static
```
CentOS 7, Stream 8, Stream 9
```
chown -R apache:apache /var/www/myauth/static
```

Apache serves sites through defined virtual hosts. These are located in `/etc/apache2/sites-available/` on Ubuntu and `/etc/httpd/conf.d/httpd.conf` on CentOS.

A virtual host for auth need only proxy requests to your WSGI server (Gunicorn if you followed the install guide) and serve static files. Examples can be found below. Create your config in its own file e.g. `myauth.conf`

### Ubuntu

To proxy and modify headers a few mods need to be enabled.
```bash
a2enmod proxy
a2enmod proxy_http
a2enmod headers
```

Create a new config file for auth e.g. `/etc/apache2/sites-available/myauth.conf` and fill out the virtual host configuration. To enable your config use `a2ensite myauth.conf` and then reload apache with `service apache2 reload`.

```eval_rst
.. warning::
    In some scenarios, the Apache default page is still enabled. To disable it use::
      a2dissite 000-default.conf
```

### CentOS

Place your virtual host configuration in the appropriate section within `/etc/httpd/conf.d/httpd.conf` and restart the httpd service with `systemctl restart httpd`.

## Sample Config File

```
<VirtualHost *:80>
        ServerName auth.example.com

        ProxyPassMatch ^/static !
        ProxyPassMatch ^/robots.txt !

        ProxyPass / http://127.0.0.1:8000/
        ProxyPassReverse / http://127.0.0.1:8000/
        ProxyPreserveHost On

        Alias "/static" "/var/www/myauth/static"
        Alias "/robots.txt" "/var/www/myauth/static/robots.txt"

        <Directory "/var/www/myauth/static">
            Require all granted
        </Directory>

        <Location "/robots.txt">
            SetHandler None
            Require all granted
        </Location>
</VirtualHost>
```

## SSL

It's 2018 - there's no reason to run a site without SSL. The EFF provides free, renewable SSL certificates with an automated installer. Visit their [website](https://certbot.eff.org/) for information.

After acquiring SSL the config file needs to be adjusted. Add the following lines inside the `<VirtualHost>` block:

```
        RequestHeader set X-FORWARDED-PROTOCOL https
        RequestHeader set X-FORWARDED-SSL On
```

### Known Issues

#### Apache2 vs. Django

For some versions of Apache2 you might have to tell the Django framework explicitly
to use SSL, since the automatic detection doesn't work. SSL in general will work,
but internally created URLs by Django might still be prefixed with just `http://`
instead of `https://`, so it can't hurt to add these lines to
`myauth/myauth/settings/local.py`.

```python
# Setup support for proxy headers
USE_X_FORWARDED_HOST = True
SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTOCOL", "https")
```