GTlsClientConnection: GIO Reference Manual

## GTlsClientConnection GTlsClientConnection — TLS client-side connection |

## Functions

GIOStream * | g_tls_client_connection_new ()
void | g_tls_client_connection_set_server_identity ()
GSocketConnectable * | g_tls_client_connection_get_server_identity ()
void | g_tls_client_connection_set_validation_flags ()
GTlsCertificateFlags | g_tls_client_connection_get_validation_flags ()
void | g_tls_client_connection_set_use_ssl3 ()
gboolean | g_tls_client_connection_get_use_ssl3 ()
GList * | g_tls_client_connection_get_accepted_cas ()
void | g_tls_client_connection_copy_session_state ()

## Properties

gpointer | accepted-cas | Read
GSocketConnectable * | server-identity | Read / Write / Construct
gboolean | use-ssl3 | Read / Write / Construct
GTlsCertificateFlags | validation-flags | Read / Write / Construct

## Types and Values

| GTlsClientConnection
struct | GTlsClientConnectionInterface

## Object Hierarchy

        GInterface
        ╰── GTlsClientConnection

## Prerequisites

GTlsClientConnection requires GTlsConnection.

## Includes

    #include <gio/gio.h>

## Description

GTlsClientConnection is the client-side subclass of GTlsConnection, representing a client-side TLS connection.

## Functions

### g_tls_client_connection_new ()

    GIOStream *
    g_tls_client_connection_new (GIOStream *base_io_stream,
                                 GSocketConnectable *server_identity,
                                 GError **error);

Creates a new GTlsClientConnection wrapping `base_io_stream` (which must have pollable input and output streams) which is assumed to communicate with the server identified by `server_identity` .

See the documentation for “base-io-stream” for restrictions on when application code can run operations on the `base_io_stream` after this function has returned.

#### Parameters

base_io_stream | the GIOStream to wrap |
server_identity | the expected identity of the server. | [allow-none]
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

the new GTlsClientConnection, or `NULL` on error.

[transfer full][type GTlsClientConnection]

Since: 2.28

### g_tls_client_connection_set_server_identity ()

    void
    g_tls_client_connection_set_server_identity
                                   (GTlsClientConnection *conn,
                                    GSocketConnectable *identity);

Sets `conn` 's expected server identity, which is used both to tell servers on virtual hosts which certificate to present, and also to let `conn` know what name to look for in the certificate when performing `G_TLS_CERTIFICATE_BAD_IDENTITY` validation, if enabled.

#### Parameters

conn | the GTlsClientConnection |
identity | a GSocketConnectable describing the expected server identity |

Since: 2.28

### g_tls_client_connection_get_server_identity ()

    GSocketConnectable *
    g_tls_client_connection_get_server_identity
                                   (GTlsClientConnection *conn);

Gets `conn` 's expected server identity

#### Parameters

conn | the GTlsClientConnection |

#### Returns

a GSocketConnectable describing the expected server identity, or `NULL` if the expected identity is not known.

[transfer none]

Since: 2.28

### g_tls_client_connection_set_validation_flags ()

    void
    g_tls_client_connection_set_validation_flags
                                   (GTlsClientConnection *conn,
                                    GTlsCertificateFlags flags);

Sets `conn` 's validation flags, to override the default set of checks performed when validating a server certificate. By default, `G_TLS_CERTIFICATE_VALIDATE_ALL` is used.

#### Parameters

conn | the GTlsClientConnection |
flags | the GTlsCertificateFlags to use |

Since: 2.28

### g_tls_client_connection_get_validation_flags ()

    GTlsCertificateFlags
    g_tls_client_connection_get_validation_flags
                                   (GTlsClientConnection *conn);

Gets `conn` 's validation flags

#### Parameters

conn | the GTlsClientConnection |

#### Returns

the validation flags

Since: 2.28

### g_tls_client_connection_set_use_ssl3 ()

    void
    g_tls_client_connection_set_use_ssl3 (GTlsClientConnection *conn,
                                          gboolean use_ssl3);

If `use_ssl3` is `TRUE`, this forces `conn` to use SSL 3.0 rather than trying to properly negotiate the right version of TLS or SSL to use. This can be used when talking to servers that do not implement the fallbacks correctly and which will therefore fail to handshake with a "modern" TLS handshake attempt.

#### Parameters

conn | the GTlsClientConnection |
use_ssl3 | whether to use SSL 3.0 |

Since: 2.28

### g_tls_client_connection_get_use_ssl3 ()

    gboolean
    g_tls_client_connection_get_use_ssl3 (GTlsClientConnection *conn);

Gets whether `conn` will use SSL 3.0 rather than the highest-supported version of TLS; see `g_tls_client_connection_set_use_ssl3()`.

#### Parameters

conn | the GTlsClientConnection |

#### Returns

whether `conn` will use SSL 3.0

Since: 2.28

### g_tls_client_connection_get_accepted_cas ()

    GList *
    g_tls_client_connection_get_accepted_cas
                                   (GTlsClientConnection *conn);

Gets the list of distinguished names of the Certificate Authorities that the server will accept certificates from. This will be set during the TLS handshake if the server requests a certificate. Otherwise, it will be `NULL`.

Each item in the list is a GByteArray which contains the complete subject DN of the certificate authority.

#### Parameters

conn | the GTlsClientConnection |

#### Returns

the list of CA DNs. You should unref each element with `g_byte_array_unref()` and then the free the list with `g_list_free()`.

[element-type GByteArray][transfer full]

Since: 2.28

### g_tls_client_connection_copy_session_state ()

    void
    g_tls_client_connection_copy_session_state
                                   (GTlsClientConnection *conn,
                                    GTlsClientConnection *source);

Copies session state from one connection to another. This is not normally needed, but may be used when the same session needs to be used between different endpoints as is required by some protocols such as FTP over TLS. `source` should have already completed a handshake, and `conn` should not have completed a handshake.

#### Parameters

conn | a GTlsClientConnection |
source | a GTlsClientConnection |

Since: 2.46

## Types and Values

### GTlsClientConnection

    typedef struct _GTlsClientConnection GTlsClientConnection;

Abstract base class for the backend-specific client connection type.

Since: 2.28

### struct GTlsClientConnectionInterface

    struct GTlsClientConnectionInterface {
      GTypeInterface g_iface;

      void     ( *copy_session_state )     (GTlsClientConnection       *conn,
                                            GTlsClientConnection       *source);
    };

vtable for a GTlsClientConnection implementation.

#### Members

`copy_session_state` () | Copies session state from one GTlsClientConnection to another. |

Since: 2.26

## Property Details

### The `“accepted-cas”` property

      “accepted-cas”             gpointer

A list of the distinguished names of the Certificate Authorities that the server will accept client certificates signed by. If the server requests a client certificate during the handshake, then this property will be set after the handshake completes.

Each item in the list is a GByteArray which contains the complete subject DN of the certificate authority.

[element-type GLib.ByteArray]

Flags: Read

Since: 2.28

### The `“server-identity”` property

      “server-identity”          GSocketConnectable *

A GSocketConnectable describing the identity of the server that is expected on the other end of the connection.

If the `G_TLS_CERTIFICATE_BAD_IDENTITY` flag is set in “validation-flags”, this object will be used to determine the expected identify of the remote end of the connection; if “server-identity” is not set, or does not match the identity presented by the server, then the `G_TLS_CERTIFICATE_BAD_IDENTITY` validation will fail.

In addition to its use in verifying the server certificate, this is also used to give a hint to the server about what certificate we expect, which is useful for servers that serve virtual hosts.

Flags: Read / Write / Construct

Since: 2.28

### The `“use-ssl3”` property

      “use-ssl3”                 gboolean

If `TRUE`, tells the connection to use a fallback version of TLS or SSL, rather than trying to negotiate the best version of TLS to use. This can be used when talking to servers that don't implement version negotiation correctly and therefore refuse to handshake at all with a "modern" TLS handshake.

Despite the property name, the fallback version is not necessarily SSL 3.0; if SSL 3.0 has been disabled, the GTlsClientConnection will use the next highest available version (normally TLS 1.0) as the fallback version.

Flags: Read / Write / Construct

Default value: FALSE

Since: 2.28

### The `“validation-flags”` property

      “validation-flags”         GTlsCertificateFlags

What steps to perform when validating a certificate received from a server. Server certificates that fail to validate in all of the ways indicated here will be rejected unless the application overrides the default via “accept-certificate”.

Flags: Read / Write / Construct

Default value: G_TLS_CERTIFICATE_UNKNOWN_CA | G_TLS_CERTIFICATE_BAD_IDENTITY | G_TLS_CERTIFICATE_NOT_ACTIVATED | G_TLS_CERTIFICATE_EXPIRED | G_TLS_CERTIFICATE_REVOKED | G_TLS_CERTIFICATE_INSECURE | G_TLS_CERTIFICATE_GENERIC_ERROR

Since: 2.28