Initialize a new TlsConnection.

Returns the type id (GType) registered in GLib type system.

Sets the list of application-layer protocols to advertise that the caller is willing to speak on this connection. The Application-Layer Protocol Negotiation (ALPN) extension will be used to negotiate a compatible protocol with the peer; use g_tls_connection_get_negotiated_protocol() to find the negotiated protocol after the handshake. Specifying nil for the the value of @protocols will disable ALPN negotiation.

See IANA TLS ALPN Protocol IDs for a list of registered protocol IDs.

Gets @conn's certificate, as set by g_tls_connection_set_certificate().

This sets the certificate that @conn will present to its peer during the TLS handshake. For a #GTlsServerConnection, it is mandatory to set this, and that will normally be done at construct time.

For a #GTlsClientConnection, this is optional. If a handshake fails with %G_TLS_ERROR_CERTIFICATE_REQUIRED, that means that the server requires a certificate, and if you try connecting again, you should call this method first. You can call g_tls_client_connection_get_accepted_cas() on the failed connection to get a list of Certificate Authorities that the server will accept certificates from.

(It is also possible that a server will allow the connection with or without a certificate; in that case, if you don't provide a certificate, you can tell that the server requested one by the fact that g_tls_client_connection_get_accepted_cas() will return non-nil.)

Query the TLS backend for TLS channel binding data of @type for @conn.

This call retrieves TLS channel binding data as specified in RFC 5056, RFC 5929, and related RFCs. The binding data is returned in @data. The @data is resized by the callee using #GByteArray buffer management and will be freed when the @data is destroyed by g_byte_array_unref(). If @data is nil, it will only check whether TLS backend is able to fetch the data (e.g. whether @type is supported by the TLS backend). It does not guarantee that the data will be available though. That could happen if TLS connection does not support @type or the binding data is not available yet due to additional negotiation or input required.

Returns the name of the current TLS ciphersuite, or nil if the connection has not handshaked or has been closed. Beware that the TLS backend may use any of multiple different naming conventions, because OpenSSL and GnuTLS have their own ciphersuite naming conventions that are different from each other and different from the standard, IANA- registered ciphersuite names. The ciphersuite name is intended to be displayed to the user for informative purposes only, and parsing it is not recommended.

Gets the certificate database that @conn uses to verify peer certificates. See g_tls_connection_set_database().

Sets the certificate database that is used to verify peer certificates. This is set to the default database by default. See g_tls_backend_get_default_database(). If set to nil, then peer certificate validation will always set the %G_TLS_CERTIFICATE_UNKNOWN_CA error (meaning #GTlsConnection::accept-certificate will always be emitted on client-side connections, unless that bit is not set in #GTlsClientConnection:validation-flags).

There are nonintuitive security implications when using a non-default database. See #GTlsConnection:database for details.

Used by #GTlsConnection implementations to emit the #GTlsConnection::accept-certificate signal.

Attempts a TLS handshake on @conn.

On the client side, it is never necessary to call this method; although the connection needs to perform a handshake after connecting (or after sending a "STARTTLS"-type command), #GTlsConnection will handle this for you automatically when you try to send or receive data on the connection. You can call g_tls_connection_handshake() manually if you want to know whether the initial handshake succeeded or failed (as opposed to just immediately trying to use @conn to read or write, in which case, if it fails, it may not be possible to tell if it failed before or after completing the handshake), but beware that servers may reject client authentication after the handshake has completed, so a successful handshake does not indicate the connection will be usable.

Likewise, on the server side, although a handshake is necessary at the beginning of the communication, you do not need to call this function explicitly unless you want clearer error reporting.

Previously, calling g_tls_connection_handshake() after the initial handshake would trigger a rehandshake; however, this usage was deprecated in GLib 2.60 because rehandshaking was removed from the TLS protocol in TLS 1.3. Since GLib 2.64, calling this function after the initial handshake will no longer do anything.

When using a #GTlsConnection created by #GSocketClient, the #GSocketClient performs the initial handshake, so calling this function manually is not recommended.

#GTlsConnection::accept_certificate may be emitted during the handshake.

Asynchronously performs a TLS handshake on @conn. See g_tls_connection_handshake() for more information.

Finish an asynchronous TLS handshake operation. See g_tls_connection_handshake() for more information.

Get the object that will be used to interact with the user. It will be used for things like prompting the user for passwords. If nil is returned, then no user interaction will occur for this connection.

Set the object that will be used to interact with the user. It will be used for things like prompting the user for passwords.

The @interaction argument will normally be a derived subclass of #GTlsInteraction. nil can also be provided if no user interaction should occur for this connection.

Gets the name of the application-layer protocol negotiated during the handshake.

If the peer did not use the ALPN extension, or did not advertise a protocol that matched one of @conn's protocols, or the TLS backend does not support ALPN, then this will be nil. See g_tls_connection_set_advertised_protocols().

Gets @conn's peer's certificate after the handshake has completed or failed. (It is not set during the emission of #GTlsConnection::accept-certificate.)

Gets the errors associated with validating @conn's peer's certificate, after the handshake has completed or failed. (It is not set during the emission of #GTlsConnection::accept-certificate.)

See #GTlsConnection:peer-certificate-errors for more information.

Returns the current TLS protocol version, which may be %G_TLS_PROTOCOL_VERSION_UNKNOWN if the connection has not handshaked, or has been closed, or if the TLS backend has implemented a protocol version that is not a recognized #GTlsProtocolVersion.

Gets @conn rehandshaking mode. See g_tls_connection_set_rehandshake_mode() for details.

Since GLib 2.64, changing the rehandshake mode is no longer supported and will have no effect. With TLS 1.3, rehandshaking has been removed from the TLS protocol, replaced by separate post-handshake authentication and rekey operations.

Tests whether or not @conn expects a proper TLS close notification when the connection is closed. See g_tls_connection_set_require_close_notify() for details.

Sets whether or not @conn expects a proper TLS close notification before the connection is closed. If this is true (the default), then @conn will expect to receive a TLS close notification from its peer before the connection is closed, and will return a %G_TLS_ERROR_EOF error if the connection is closed without proper notification (since this may indicate a network error, or man-in-the-middle attack).

In some protocols, the application will know whether or not the connection was closed cleanly based on application-level data (because the application-level data includes a length field, or is somehow self-delimiting); in this case, the close notify is redundant and sometimes omitted. (TLS 1.1 explicitly allows this; in TLS 1.0 it is technically an error, but often done anyway.) You can use g_tls_connection_set_require_close_notify() to tell @conn to allow an "unannounced" connection close, in which case the close will show up as a 0-length read, as in a non-TLS #GSocketConnection, and it is up to the application to check that the data has been fully received.

Note that this only affects the behavior when the peer closes the connection; when the application calls g_io_stream_close() itself on @conn, this will send a close notification regardless of the setting of this property. If you explicitly want to do an unclean close, you can close @conn's #GTlsConnection:base-io-stream rather than closing @conn itself, but note that this may only be done when no other operations are pending on @conn or the base I/O stream.

Gets whether @conn uses the system certificate database to verify peer certificates. See g_tls_connection_set_use_system_certdb().

Sets whether @conn uses the system certificate database to verify peer certificates. This is true by default. If set to false, then peer certificate validation will always set the %G_TLS_CERTIFICATE_UNKNOWN_CA error (meaning #GTlsConnection::accept-certificate will always be emitted on client-side connections, unless that bit is not set in #GTlsClientConnection:validation-flags).