How to Upgrade a TCP Connection to TLS in Go Without a Segmentation Fault?

Upgrading a Connection to TLS in Go

Problem:

You have an existing TCP connection that you want to upgrade to TLS using tls.Server() and TLSconfig. However, after upgrading the connection, you encounter a segmentation fault.

Solution:

To upgrade a net.Conn to a tls.Conn and avoid the segmentation fault, follow these steps:

1. Initialize a TLSconfig object as described in the provided answer.
2. When the client initiates STARTTLS, create a new tls.Conn from the existing net.Conn.
3. Perform a tlsConn.Handshake().
4. Convert the tlsConn back to a net.Conn using net.Conn(tlsConn).

Note: This method ensures that you maintain the same socket connection and do not establish a new one on a different port.

Understanding the Conversion

In Go, the tls.Server() function returns a tls.Conn, which implements the net.Conn interface. This allows you to convert the tls.Conn back to a net.Conn using type conversion, as demonstrated in the code provided.

Additional Information

• For more details on Go's conversion mechanisms, refer to the Go documentation:

  • [Conversions](https://golang.org/ref/spec#Conversions)
  • [Effective Go: Conversions](https://golang.org/doc/effective_go.html#conversions)
• You can also use the tls.Dial() function to upgrade an existing connection to TLS on the client side.

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