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DATABASE.md

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Introduction

The VPN server supports other databases than just the default SQLite. For SQLite, no configuration is needed, it works out of the box. If you are happy with that, there is no need to read this document.

NOTE (1): only consider switching databases if your database has a higher reliability than your systems on which you host the VPN server, and you want to run a HA setup.

NOTE (2): this document only explains how to use another database, it does NOT explain how to run reliably database infrastructure! The document does provide database server installation/configuration instructions to the level needed to test the different database backends. This is NOT suitable for production as-is!

NOTE (3): if you can choose, we recommend you use PostgreSQL and not MariaDB/MySQL.

NOTE (4): we assume you used deploy_${DIST}_controller.sh and deploy_${DIST}_node.sh to install the VPN service.

Configuration

You can configure the database in /etc/vpn-user-portal/config.php, replace the host, dbname with the values obtained from your database administrator.

PostgreSQL

Make sure you have the php-pgsql package installed, on Debian use apt instead of dfn:

$ sudo dnf install php-pgsql

In /etc/vpn-user-portal/config.php:

    'Db' => [
        'dbDsn' => 'pgsql:host=db.example.org;dbname=vpn;user=vpn;password=s3cr3t',
    ],

Replace host, dbname, user and password with the values you obtained from your database administrator.

MariaDB/MySQL

Make sure you have the php-mysqlnd package installed:

$ sudo dnf install php-mysqlnd

In /etc/vpn-user-portal/config.php:

    'Db' => [
	    'dbDsn' => 'mysql:host=db.example.org;dbname=vpn',
	    'dbUser' => 'vpn',
	    'dbPass' => 's3cr3t',
    ],

Replace host, dbname, dbUser and dbPass with the values you obtained from your database administrator.

Database Info

You can show the current status of your database, this will tell you whether the configuration was done properly, i.e. we are able to connect to the database and whether initialization or migration is required, e.g.:

$ sudo /usr/libexec/vpn-user-portal/db
Current Schema Version : 2022010202
Required Schema Version: 2022010202
Status                 : **OK**

Database Initialization

If you need to initialize the database:

$ sudo /usr/libexec/vpn-user-portal/db --init

You can override your database configuration with --dsn, --user, --pass options in case you need different credentials to perform a database initialization.

Database Migration

Updates to the VPN software MAY require database migrations. This will be indicated in the release notes of newer versions.

You can perform the migration:

$ sudo /usr/libexec/vpn-user-portal/db --migrate

You can override your database configuration with --dsn, --user, --pass options in case you need different credentials to perform a database migration.

If a migration is needed, but not performed the VPN portal will give a clear error message.

Manual Initialization / Migration

If you really want to perform every step manually, you need to look in /usr/share/vpn-user-portal/schema for the SQL schema files. The latest version available there SHOULD be used for initialization, the files with _ are the migration queries that need to be run to migrate from one version to the next.

NOTE: make sure you also create/update the version table that contains the current version, e.g.:

CREATE TABLE version (current_version TEXT NOT NULL);
INSERT INTO version VALUES('2021123001');

Database Server Installation

As mentioned above, this is only for testing!

PostgreSQL Installation

Fedora

$ sudo dnf -y install postgresql-server 
$ sudo postgresql-setup --initdb

Debian

$ sudo apt -y install postgresql

PostgreSQL Configuration

First we'll allow password authentication. Modify /var/lib/pgsql/data/pg_hba.conf. On Debian this is /etc/postgresql/13/main/pg_hba.conf. Add these lines:

host    all             all             127.0.0.1/32            scram-sha-256
host    all             all             ::1/128                 scram-sha-256

NOTE: make sure these rows are placed above the lines that have METHOD with value ident, or replace the ones with ident in them.

Replace 127.0.0.1/32 and ::1/128 with the IP(v6) prefixes where the PostgreSQL "client" is coming from if you run PostgreSQL on a separate system.

Also modify /var/lib/pgsql/data/postgresql.conf (or /etc/postgresql/13/main/postgresql.conf on Debian) and set:

password_encryption = scram-sha-256

Also modify the listen_addresses option if you want to allow connecting from a remote system, e.g.:

#listen_addresses = 'localhost'
listen_addresses = '*'

Now, start (and auto start on boot) PostgreSQL, on Debian it was auto started, so you only need to restart it:

$ sudo systemctl enable postgresql
$ sudo systemctl restart postgresql

In order to create a database, we need to execute the createuser command as postgres user:

$ sudo su -l postgres 
$ createuser -d -P vpn
Enter password for new role: 
Enter it again: 
$ exit

The -d option will allow the user to create databases. The -P option will ask immediately to specify a password. Provide one!

Create the database:

$ createdb -h localhost -U vpn vpn

This will ask for the password, provide it. The database will be created. Test whether you can connect to the database:

$ psql -h localhost -U vpn
Password for user vpn: 
psql (13.4)
Type "help" for help.

vpn=>

All good!

MariaDB Installation

Follow the instructions below to configure your MariaDB server:

$ sudo dnf -y install mariadb-server
$ sudo systemctl enable --now mariadb
$ sudo mysql_secure_installation

You can leave most things at their defaults, but set a root password when asked, you will need it below.

MariaDB Configuration

Now you need to create a database and a user with a password.

$ mysql -u root -p

Provide the root password, and run the following commands. Replace the name of the database and user if you want. Make sure you choose your own password.

Local Access

If you install the MariaDB on the same system as your VPN service, run the following commands:

MariaDB [(none)]> CREATE DATABASE vpn;
MariaDB [(none)]> GRANT ALL PRIVILEGES ON vpn.* to vpn@localhost IDENTIFIED BY 's3cr3t';
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> QUIT

Now you should be able to connect to the database using your newly created account:

$ mysql vpn -u vpn -p

Remote Access

If you install the MariaDB on a different system from your VPN service, as you SHOULD, run the following commands:

MariaDB [(none)]> CREATE DATABASE vpn;
MariaDB [(none)]> GRANT ALL PRIVILEGES ON vpn.* to vpn@'%' IDENTIFIED BY 's3cr3t';
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> QUIT

Now you should be able to connect to your database server from your VPN portal using your newly created account:

$ mysql vpn -h db.example.org -u vpn -p

NOTE: you MUST make sure only your VPN portals can reach MariaDB and not the complete Internet! It seems by default MariaDB listens in :::3306 which means all interfaces (both IPv4 and IPv6). You MUST firewall this port and restrict access to your VPN portals only!