How Swoole implements high-performance SSL proxy service

As the importance of network security becomes increasingly prominent, more and more websites need to use SSL/TLS encryption to protect the security of user data. However, websites that use SSL/TLS encryption will add a lot of overhead when transmitting data, affecting the website's performance and response speed. In order to solve this problem, we can use Swoole to implement high-performance SSL proxy service.

Swoole is a high-performance asynchronous network framework developed based on PHP language. It can easily achieve high concurrency and high performance, and supports TCP, UDP, HTTP, WebSocket and other protocols. In Swoole, we can use asynchronous IO and coroutines to implement high-performance network programming.

Let's introduce how to use Swoole to implement high-performance SSL proxy service.

1. Create SSL proxy service

We first need to create an SSL proxy service. In Swoole, we can use the SwooleHttpServer class to implement an HTTP/HTTPS server.

$http = new SwooleHttpServer("0.0.0.0", 9501, SWOOLE_PROCESS, SWOOLE_SOCK_TCP | SWOOLE_SSL);

When creating a server, we need to specify the IP address, port number, process mode and Socket type. Here, we use SWOOLE_SOCK_TCP | SWOOLE_SSL to enable the SSL service.

2. Set SSL certificate and key

When creating an SSL proxy service, we also need to set the SSL certificate and key. We can use the set method of the SwooleHttpServer class to set the SSL certificate and key.

$http->set([
    'ssl_cert_file' => '/path/to/server.crt',
    'ssl_key_file' => '/path/to/server.key',
]);

Here, we need to replace the paths of the certificate and key files with the actual paths.

3. Processing SSL handshake and forwarding requests

When the client initiates an SSL connection request, Swoole will automatically complete the SSL handshake process. After a successful handshake, we need to forward the request sent by the client to the actual server.

$http->on('request', function (SwooleHttpRequest $request, SwooleHttpResponse $response) {
    $client = new SwooleCoroutineClient(SWOOLE_SOCK_TCP | SWOOLE_SSL);
    $client->set([
        'ssl_host_name' => $request->header['host'] ?? '', // 获取目标服务器的主机名
        'ssl_cafile' => '/path/to/ca.pem', // 根证书
    ]);
    $client->connect('127.0.0.1', 80, 0.5); // 连接实际的服务器
    $client->send($request->rawContent()); // 发送请求数据
    $response->end($client->recv()); // 接收响应数据并返回客户端
});

Here, we use the SwooleCoroutineClient class to communicate with the actual server. We need to set ssl_host_name to specify the host name of the target server, and also need to provide the root certificate of the SSL certificate chain.

4. Complete code

The following is the code of a complete SSL proxy server:

$http = new SwooleHttpServer("0.0.0.0", 9501, SWOOLE_PROCESS, SWOOLE_SOCK_TCP | SWOOLE_SSL);
$http->set([
    'ssl_cert_file' => '/path/to/server.crt',
    'ssl_key_file' => '/path/to/server.key',
    'ssl_verify_depth' => 10, // SSL证书链验证深度
]);
$http->on('request', function (SwooleHttpRequest $request, SwooleHttpResponse $response) {
    $client = new SwooleCoroutineClient(SWOOLE_SOCK_TCP | SWOOLE_SSL);
    $client->set([
        'ssl_host_name' => $request->header['host'] ?? '',
        'ssl_cafile' => '/path/to/ca.pem',
    ]);
    $client->connect('127.0.0.1', 80, 0.5);
    $client->send($request->rawContent());
    $response->end($client->recv());
});
$http->start();

When using it, we only need to change the actual server Just replace the address with 127.0.0.1. In an actual production environment, we may also need to add some other security measures and optimization strategies to ensure the security and stability of the server.

Summary

By using the Swoole framework, we can easily implement a high-performance SSL proxy service to handle a large number of encrypted requests while ensuring the response speed and security of the website. When using Swoole, we need to pay attention to the security configuration of the SSL certificate and the verification of the root certificate to avoid security vulnerabilities and risks.

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