en	SSL/TLS Shutdown

en	A secure SSL/TLS connection requires a proper shutdown process to securely indicate the [@https://en.wikipedia.org/wiki/End-of-file ['EOF]] condition. This process prevents a type of attack known as a [@https://en.wikipedia.org/wiki/Transport_Layer_Security#Truncation_attack ['truncation attack]] in which an attacker can close the underlying transport layer and control the length of the last message in the SSL/TLS connection. A shutdown process consists of exchanging `close_notify` message between two parties. In __Asio__ these steps happen by calling `shutdown()` or `async_shutdown()` on `ssl::stream` object.

en	error::stream_truncated

en	There are SSL/TLS implementations that don't perform a proper shutdown process and simply close the underlying transport layer instead. As a result, the EOF condition in these applications is not cryptographically secure and should not be relied upon. However, there are scenarios where an HTTPS client or server doesn't need EOF for determining the end of the last message:

en	* The HTTP message has a `Content-Length` header, and the body is fully

en	* The HTTP message uses chunked transfer encoding, and the final chunk is

en	* The HTTP message doesn't contain a body, such as any response with a 1xx

en	In such scenarios, `http::read` or `http::async_read` operations succeed as they don't need EOF to complete. However, the next operation on the stream would fail with an [@boost:/doc/html/boost_asio/reference/ssl__error__stream_errors.html `net::ssl::error::stream_truncated`] error.

en	For example, let's assume we are using Beast for communicating with an HTTPS server that doesn't perform a proper SSL/TLS shutdown:

en	Non-Compliant Peers and Unknown Body Length

en	This is a rare case and indeed a security issue when HTTPS servers don't perform a proper SSL/TLS shutdown procedure and send an HTTP response message that relies on EOF to determine the end of the body. This is a security concern because without an SSL/TLS shutdown procedure, the EOF is not cryptographically secure, leaving the message body vulnerable to truncation attacks.

en	The following is an example that can read an HTTP response from such a server: