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Closing connection using TLS

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#320 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
php
Domain
networking

Research direction

Start in src/Connection.php around the shutdown logic referenced by the issue, then reproduce the provided TLS server example. Compare the proposed fclose and stream_socket_enable_crypto approaches against PHP's TLS shutdown behavior; done means closing the connection cleanly without the current TLS shutdown problem.

Written by the indexing model from the issue text.

Description

bug

When closing a connection on a server using TLS, eg:

<?php

require __DIR__ . '/vendor/autoload.php';

$server = new React\Socket\TcpServer($port = 9900);
$server = new React\Socket\SecureServer($server, null, [
    'local_cert' => 'server.pem',
    'passphrase' => 'secret'
]);

$server->on('connection', function (React\Socket\ConnectionInterface $connection) {
    echo '[' . $connection->getRemoteAddress() . ' connected]' . PHP_EOL;

    // do stuff
    
    $connection->end();
});

the connection is not closed properly, as https://github.com/reactphp/socket/blob/e04478a14b22c2f85697b917dcc26fa8f1654098/src/Connection.php#L123-L133
uses https://www.php.net/manual/en/function.stream-socket-shutdown.php.

Note comment https://www.php.net/manual/en/function.stream-socket-shutdown.php#125659 which states tls does not get shut down properly that way.

Solution seems to be to replace @\stream_socket_shutdown($this->stream, \STREAM_SHUT_RDWR); with \fclose($this->stream).

Other solution seems to be to call @\stream_socket_enable_crypto($this->stream, false); before the socket shutdown as mentioned in comment https://www.php.net/manual/en/function.stream-socket-shutdown.php#126303

Dominant language
PHP
Stars
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Forks
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