How to Upgrade an Existing TCP Connection to TLS in Go?

Upgrading a Connection to TLS in Go

Problem Statement:

You have an open TCP connection and are reading from it in a loop. You wish to upgrade the connection to TLS using configuration stored in tx.Server.Conf.TlsConf, but you encounter a segmentation fault on the client when the server attempts a handshake.

Solution:

The issue lies in the incorrect way you handle the TLS upgrade. To correctly upgrade a connection to TLS, follow these steps:

<code class="go">// server.socket is of type net.Conn
conn := tls.Server(server.socket, tlsConfig)
conn.Handshake()
netConn := net.Conn(conn)

// Update buffers and handle the connection as usual.</code>

TLS Connection Upgrade Process:

When TLS is enabled, the following occurs:

1. The client initiates a STARTTLS command.
2. The server responds with an acknowledgement.
3. The client and server establish a new TLS session.
4. The TLS session is negotiated securely using the TLS handshake protocol.
5. After a successful handshake, the connection is upgraded to TLS.
6. Data is transmitted over the upgraded TLS connection.

Note on Conversions in Go:

The ability to seamlessly convert between net.Conn and tls.Conn is a powerful feature of Go. This allows for the easy integration of TLS into existing code without the need for complex wrappers or adapters.

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