Struct SslStream

pub struct SslStream<S> { /* private fields */ }

An asynchronous SSL stream

Methods from Deref<Target = SslStream<AsStdIo<S>>>

pub fn read_early_data(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Read application data transmitted by a client before handshake completion.

Useful for reducing latency, but vulnerable to replay attacks. Call SslRef::set_accept_state first.

Returns Ok(0) if all early data has been read.

Requires OpenSSL 1.1.1 or LibreSSL 3.4.0 or newer.

This corresponds to SSL_read_early_data.

pub fn write_early_data(&mut self, buf: &[u8]) -> Result<usize, Error>

Send data to the server without blocking on handshake completion.

Useful for reducing latency, but vulnerable to replay attacks. Call SslRef::set_connect_state first.

Requires OpenSSL 1.1.1 or LibreSSL 3.4.0 or newer.

This corresponds to SSL_write_early_data.

pub fn connect(&mut self) -> Result<(), Error>

Initiates a client-side TLS handshake.

Warning

OpenSSL’s default configuration is insecure. It is highly recommended to use SslConnector rather than Ssl directly, as it manages that configuration.

This corresponds to SSL_connect.

pub fn accept(&mut self) -> Result<(), Error>

Initiates a server-side TLS handshake.

Warning

OpenSSL’s default configuration is insecure. It is highly recommended to use SslAcceptor rather than Ssl directly, as it manages that configuration.

This corresponds to SSL_accept.

pub fn do_handshake(&mut self) -> Result<(), Error>

Initiates the handshake.

This will fail if set_accept_state or set_connect_state was not called first.

This corresponds to SSL_do_handshake.

pub fn stateless(&mut self) -> Result<bool, ErrorStack>

Perform a stateless server-side handshake.

Requires that cookie generation and verification callbacks were set on the SSL context.

Returns Ok(true) if a complete ClientHello containing a valid cookie was read, in which case the handshake should be continued via accept. If a HelloRetryRequest containing a fresh cookie was transmitted, Ok(false) is returned instead. If the handshake cannot proceed at all, Err is returned.

This corresponds to SSL_stateless.

pub fn read_uninit( &mut self, buf: &mut [MaybeUninit<u8>], ) -> Result<usize, Error>

Like read, but takes a possibly-uninitialized slice.

Safety

No portion of buf will be de-initialized by this method. If the method returns Ok(n), then the first n bytes of buf are guaranteed to be initialized.

This corresponds to SSL_read_ex.

pub fn ssl_read(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Like read, but returns an ssl::Error rather than an io::Error.

It is particularly useful with a non-blocking socket, where the error value will identify if OpenSSL is waiting on read or write readiness.

This corresponds to SSL_read_ex.

pub fn ssl_read_uninit( &mut self, buf: &mut [MaybeUninit<u8>], ) -> Result<usize, Error>

Like read_ssl, but takes a possibly-uninitialized slice.

Safety

No portion of buf will be de-initialized by this method. If the method returns Ok(n), then the first n bytes of buf are guaranteed to be initialized.

This corresponds to SSL_read_ex.

pub fn ssl_write(&mut self, buf: &[u8]) -> Result<usize, Error>

Like write, but returns an ssl::Error rather than an io::Error.

It is particularly useful with a non-blocking socket, where the error value will identify if OpenSSL is waiting on read or write readiness.

This corresponds to SSL_write_ex.

pub fn ssl_peek(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Reads data from the stream, without removing it from the queue.

This corresponds to SSL_peek_ex.

pub fn shutdown(&mut self) -> Result<ShutdownResult, Error>

Shuts down the session.

The shutdown process consists of two steps. The first step sends a close notify message to the peer, after which ShutdownResult::Sent is returned. The second step awaits the receipt of a close notify message from the peer, after which ShutdownResult::Received is returned.

While the connection may be closed after the first step, it is recommended to fully shut the session down. In particular, it must be fully shut down if the connection is to be used for further communication in the future.

This corresponds to SSL_shutdown.

pub fn get_shutdown(&mut self) -> ShutdownState

Returns the session’s shutdown state.

This corresponds to SSL_get_shutdown.

pub fn set_shutdown(&mut self, state: ShutdownState)

Sets the session’s shutdown state.

This can be used to tell OpenSSL that the session should be cached even if a full two-way shutdown was not completed.

This corresponds to SSL_set_shutdown.

pub fn get_ref(&self) -> &S

Returns a shared reference to the underlying stream.

pub fn get_mut(&mut self) -> &mut S

Returns a mutable reference to the underlying stream.

Warning

It is inadvisable to read from or write to the underlying stream as it will most likely corrupt the SSL session.

pub fn ssl(&self) -> &SslRef

Returns a shared reference to the Ssl object associated with this stream.

Trait Implementations

impl<S> AsyncRead for SslStream<S>

where S: Unpin + AsyncRead + AsyncWrite,

fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8], ) -> Poll<Result<usize>>

Attempt to read from the AsyncRead into buf.

fn poll_read_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &mut [IoSliceMut<'_>], ) -> Poll<Result<usize, Error>>

Attempt to read from the AsyncRead into bufs using vectored IO operations.

impl<S> AsyncWrite for SslStream<S>

where S: AsyncWrite + AsyncRead + Unpin,

fn poll_write( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll<Result<usize>>

Attempt to write bytes from buf into the object.

fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempt to flush the object, ensuring that any buffered data reach their destination.

fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempt to close the object.

fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize, Error>>

Attempt to write bytes from bufs into the object using vectored IO operations.

impl<S: Debug> Debug for SslStream<S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<S> Deref for SslStream<S>

type Target = SslStream<AsStdIo<S>>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<S> DerefMut for SslStream<S>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.