Connecting to a MySQL database through SSH PHP - php

Question

For my University project I am connecting to a MySQL database. As of covid 19 I can't go to uni so have to do it remotely can anyone help with the PHP connection?
SSH Hostname: ssh.University.uk:2223
SSH Username: s4905304
SHH Password: ....
SSH Key File:blank
MySQL Hostname: 127.0.0.1
MySQL Server Port:3306
Username:s4905304
Password:.....

Answer 1

Try this:
Step 1.
Set up an SSH tunnel to your MySQL database server (preferably, through a Jumpbox for security).
ssh -fNg -L 3307:10.3.1.55:3306 username#ssh_jumpbox.com
The key here is -L which says we're doing local port forwarding.
Local Port Forwarding Syntax
<local_workstation_port>:<database_server_addr_remote_end_of_tunnel>:<database_server_port_remote_end>
username#ssh_proxy_host.com
Other switches are:
-f (go to background)
-N (do not execute a remote command)
-g (allow remote hosts to connect to local forwarded ports)
Private Key Authentication, add (-i) switch to above:
-i /path/to/private-key
Step 2.
Tell your local MySQL client to connect through your SSH tunnel via the local port 3307 on your machine (-h 127.0.0.1) which now forwards all traffic sent to it through the SSH tunnel you established in step 1.
mysql -h 127.0.0.1 -P 3307 -u dbuser -p passphrase
Data exchange between client and server is now sent over the encrypted SSH connection and is secure.
Tunneling directly to your database server is not recommended - having a database server directly accessible from the internet is a huge security liability. Make the tunnel target address the internet address of your Jumpbox/Bastion Host (see example in step 1) and your database target the internal IP address of your database server on the remote network. SSH will do the rest.
Credit to Chris Snyder's great article at http://chxo.com/be2/20040511_5667.html
Step 3.
Connecting. DSN
PDO has a fancy connection method called DSN. It's nothing
complicated though - instead of one plain and simple list of options,
PDO asks you to input different configuration directives in three
different places:
database driver, host, db (schema) name and charset, as well as less frequently used port and unix_socket go into DSN;
username and password go to constructor;
all other options go into options array.
where DSN is a semicolon-delimited string, consists of param=value
pairs, that begins from the driver name and a colon:
mysql:host=localhost;dbname=test;port=3306;charset=utf8mb4
driver^ ^ colon ^param=value pair ^semicolon
Note that it's important to follow the proper format - no spaces or
quotes or other decorations have to be used in DSN, but only
parameters, values and delimiters, as shown in the manual.
Here goes an example for MySQL:
$host = '127.0.0.1';
$db = 'test';
$user = 'root';
$pass = '';
$charset = 'utf8mb4';
$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => false,
];
try {
$pdo = new PDO($dsn, $user, $pass, $options);
} catch (\PDOException $e) {
throw new \PDOException($e->getMessage(), (int)$e->getCode());
}
Quoted from: https://phpdelusions.net/pdo#dsn