GIO Reference Manual: GTlsClientConnection

## 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 ()

## 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` .

#### 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

## 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;
    };

## Property Details

### The `“accepted-cas”` property

      “accepted-cas”             gpointer

Distinguished names of the CAs the server accepts certificates from.

Flags: Read

### 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 SSL 3.0 rather than trying to negotiate the best version of TLS or SSL 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.

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