example: adapt example for gssapi callback

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

examples/samplesshd-cb.c

@@ -60,6 +60,14 @@ static int auth_password(ssh_session session, const char *user,
     return SSH_AUTH_DENIED;
 }
 
+static int auth_gssapi_mic(ssh_session session, const char *user, void *userdata){
+	(void)userdata;
+	printf("Authenticating used %s with gssapi\n",user);
+	printf("authenticated\n");
+	authenticated = 1;
+	return SSH_AUTH_SUCCESS;
+}
+
 static int pty_request(ssh_session session, ssh_channel channel, const char *term,
         int x,int y, int px, int py, void *userdata){
     (void) session;
@@ -209,6 +217,7 @@ int main(int argc, char **argv){
     struct ssh_server_callbacks_struct cb = {
         .userdata = NULL,
         .auth_password_function = auth_password,
+        .auth_gssapi_mic_function = auth_gssapi_mic,
         .channel_open_request_session_function = new_session_channel
     };
 
@@ -250,6 +259,7 @@ int main(int argc, char **argv){
         printf("ssh_handle_key_exchange: %s\n", ssh_get_error(session));
         return 1;
     }
+    ssh_set_auth_methods(session,SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_GSSAPI_MIC);
     mainloop = ssh_event_new();
     ssh_event_add_session(mainloop, session);