PHP MySQL over SSL. Peer certificate did not match

Question

I\'m trying to use Google Cloud SQL over SSL from GCE(Google Compute Engine) instance. My problem is that I cannot connect to Cloud SQL instance over SSL.

mysql comm

Answer 1

Example in CakePHP 3.5.x + PHP 7.1.x + SQL Google Cloud + SSL

Change file in: config/app.php

    ...
    ...

    /**
     * The test connection is used during the test suite.
     */
    'default' => [
        'className' => 'Cake\Database\Connection',
        'driver' => 'Cake\Database\Driver\Mysql',
        'persistent' => false,
        'host' => 'xx.xxx.xxx.xxx',
        //'port' => 'non_standard_port_number',
        'username' => 'user_name_x',
        'password' => 'pass_x',
        'database' => 'bd_name_x',
        'encoding' => 'utf8',
        'timezone' => 'UTC',
        'cacheMetadata' => true,
        'quoteIdentifiers' => false,
        'log' => false,

        'flags' => [
           PDO::MYSQL_ATTR_SSL_KEY  => CONFIG.'client-key.pem',
           PDO::MYSQL_ATTR_SSL_CERT => CONFIG.'client-cert.pem',
           PDO::MYSQL_ATTR_SSL_CA   => CONFIG.'server-ca.pem',
           PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false
        ],

        //'ssl_key' => CONFIG.'client-key.pem',
        //'ssl_cert' => CONFIG.'client-cert.pem',
        //'ssl_ca' => CONFIG.'server-ca.pem',

        //'init' => ['SET GLOBAL innodb_stats_on_metadata = 0'],
    ],
 ],
 ...
 ...

---

Example PHP Pure + PDO + SSL:

$ssl_key = CONFIG.'client-key.pem';
$ssl_cert = CONFIG.'client-cert.pem';
$ssl_ca = CONFIG.'server-ca.pem';

$pdo = new PDO('mysql:host=xxx.xxx.xxx.xxx;dbname=db_name_x', 'user_name_x', 'pass_x', array(
    PDO::MYSQL_ATTR_SSL_KEY   => '/path/full/client-key.pem',
    PDO::MYSQL_ATTR_SSL_CERT  => '/path/full/client-cert.pem',
    PDO::MYSQL_ATTR_SSL_CA    => '/path/full/server-ca.pem',
    PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false
    )
);
$statement = $pdo->query("SHOW TABLES;");
var_dump($statement);
$row = $statement->fetch(PDO::FETCH_ASSOC);
echo json_encode($row);
exit();

Answer 2

For mysqli, adding:

MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT

to real_connect() solved my instance of this issue.

Example (replace host, user, password and database as needed):

$db_connection->real_connect('ip address or host', 'user', 'password', 'database', 3306, NULL, MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT);

Full php mysqli SSL connection script:

// check if openssl is enabled on server
if(!extension_loaded('openssl')) {
    throw new Exception('This app needs the Open SSL PHP extension and it is missing.');
}

// start connection
$db_connection = mysqli_init(); 

// set ssl config (update with your certs location)
$db_connection->ssl_set('/etc/my.cnf.d/certs/client-key.pem','/etc/my.cnf.d/certs/client-cert.pem', '/etc/my.cnf.d/certs/ca-cert.pem', NULL, NULL); 

// connect (update with your host, db and credentials)
$db_connection->real_connect('ip address or host', 'user', 'password', 'database', 3306, NULL, MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT);

Answer 3

I had the same problem with a MySQL database hosted at compose cluster.

After searching and testing for hours, I found out that the best solution is to disable testing the certificate provided by the server by using the MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT flag.

I haven't tested it with PDO but with the mysqli interface it is working for me. In general this problem would appear with a database hosted at a cluster server.

Answer 4

In short, use Cloud SQL Proxy if you need to access from both PDO and mysqli. You have no choice.

https://cloud.google.com/sql/docs/sql-proxy

Answer 5

For PDO connections that don't use Google cloud or cannot benefit from the proxy solution, they have fixed the bug and it is merged now. There is now a constant for this (starting April 2017):

PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false,

http://git.php.net/?p=php-src.git;a=commit;h=247ce052cd0fc7d0d8ea1a0e7ea2075e9601766a