[glib-networking] Add TLS channel binding interface call to GTlsConnectionBase class

[Michael Catanzaro <mcatanzaro src gnome org>]

commit fed81fd1d2968e29683d4024a9aa3f9de0f0f5f7
Author: Ruslan N. Marchenko <me ruff mobi>
Date:   Wed Sep 2 22:43:12 2020 +0200

    Add TLS channel binding interface call to GTlsConnectionBase class
    
      The base class mainly assigns GTlsConnection and GDtlsConnection
      vfuncs, checks whether handshake is complete and passes the data
      to the low-level TLS backend implementation via own vfunc

 tls/base/gtlsconnection-base.c | 37 +++++++++++++++++++++++++++++++++++++
 tls/base/gtlsconnection-base.h |  5 +++++
 2 files changed, 42 insertions(+)
---
diff --git a/tls/base/gtlsconnection-base.c b/tls/base/gtlsconnection-base.c
index 97ac24fa..0bbc6b5a 100644
--- a/tls/base/gtlsconnection-base.c
+++ b/tls/base/gtlsconnection-base.c
@@ -1406,6 +1406,41 @@ g_tls_connection_base_handshake_thread_verify_certificate (GTlsConnectionBase *t
   return accepted;
 }
 
+static gboolean
+g_tls_connection_base_get_binding_data (GTlsConnection          *conn,
+                                        GTlsChannelBindingType   type,
+                                        GByteArray              *data,
+                                        GError                 **error)
+{
+  GTlsConnectionBase *tls = G_TLS_CONNECTION_BASE (conn);
+  GTlsConnectionBasePrivate *priv = g_tls_connection_base_get_instance_private (tls);
+  GTlsConnectionBaseClass *tls_class = G_TLS_CONNECTION_BASE_GET_CLASS (tls);
+
+  g_assert (tls_class->get_channel_binding_data);
+
+  if (!priv->ever_handshaked || priv->need_handshake)
+    {
+      g_set_error (error, G_TLS_CHANNEL_BINDING_ERROR,
+                   G_TLS_CHANNEL_BINDING_ERROR_INVALID_STATE,
+                   _("Handshake is not finished, no channel binding information yet"));
+      return FALSE;
+    }
+
+  return tls_class->get_channel_binding_data (tls, type, data, error);
+}
+
+static gboolean
+g_tls_connection_base_dtls_get_binding_data (GDtlsConnection         *conn,
+                                             GTlsChannelBindingType   type,
+                                             GByteArray              *data,
+                                             GError                 **error)
+{
+  GTlsConnectionBase *tls = G_TLS_CONNECTION_BASE (conn);
+
+  return g_tls_connection_base_get_binding_data ((GTlsConnection *)tls,
+                                                 type, data, error);
+}
+
 static void
 handshake_thread (GTask        *task,
                   gpointer      object,
@@ -2679,6 +2714,7 @@ g_tls_connection_base_class_init (GTlsConnectionBaseClass *klass)
   connection_class->handshake        = g_tls_connection_base_handshake;
   connection_class->handshake_async  = g_tls_connection_base_handshake_async;
   connection_class->handshake_finish = g_tls_connection_base_handshake_finish;
+  connection_class->get_binding_data = g_tls_connection_base_get_binding_data;
 
   iostream_class->get_input_stream  = g_tls_connection_base_get_input_stream;
   iostream_class->get_output_stream = g_tls_connection_base_get_output_stream;
@@ -2715,6 +2751,7 @@ g_tls_connection_base_dtls_connection_iface_init (GDtlsConnectionInterface *ifac
   iface->shutdown_finish = g_tls_connection_base_dtls_shutdown_finish;
   iface->set_advertised_protocols = g_tls_connection_base_dtls_set_advertised_protocols;
   iface->get_negotiated_protocol = g_tls_connection_base_dtls_get_negotiated_protocol;
+  iface->get_binding_data = g_tls_connection_base_dtls_get_binding_data;
 }
 
 static void
diff --git a/tls/base/gtlsconnection-base.h b/tls/base/gtlsconnection-base.h
index 45c14e52..73126837 100644
--- a/tls/base/gtlsconnection-base.h
+++ b/tls/base/gtlsconnection-base.h
@@ -79,6 +79,11 @@ struct _GTlsConnectionBaseClass
 
   gboolean                    (*is_session_resumed)         (GTlsConnectionBase   *tls);
 
+  gboolean                    (*get_channel_binding_data)   (GTlsConnectionBase      *tls,
+                                                             GTlsChannelBindingType   type,
+                                                             GByteArray              *data,
+                                                             GError                 **error);
+
   void                        (*push_io)                    (GTlsConnectionBase   *tls,
                                                              GIOCondition          direction,
                                                              gint64                timeout,