mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-09-20 17:26:14 +02:00
7eba41346e
- Make GCredentials instance and class structures private so it can't be subclassed and we don't have to worry about ABI compat issues. This also allows us to get rid of the GCredentialsPrivate struct. - Add a GCredentialsType enumeration that is used whenever exchanging pointers with the user. This allows us to support OSes with multiple native credential types. In particular, it allows supporting OSes where the native credential evolves or even changes over time. - Add g_socket_get_credentials() method. - Add tests for g_socket_get_credentials(). Right now this is in the GDBus peer-to-peer test case but we can change that later. - Move GTcpConnection into a separate gtk-doc page as was already half-done with GUnixConnection. Also finish the GUnixConnection move and ensure send_credentials() and receive_credentials() methods are in the docs. Also nuke comment about GTcpConnection being empty compared to its superclass. Signed-off-by: David Zeuthen <davidz@redhat.com>
556 lines
20 KiB
C
556 lines
20 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2009 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gunixconnection.h"
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#include "gunixcredentialsmessage.h"
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#include "glibintl.h"
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/**
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* SECTION: gunixconnection
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* @title: GUnixConnection
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* @short_description: A UNIX domain GSocketConnection
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* @include: gio/gunixconnection.h
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* @see_also: #GSocketConnection.
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*
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* This is the subclass of #GSocketConnection that is created
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* for UNIX domain sockets.
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*
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* It contains functions to do some of the UNIX socket specific
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* functionality like passing file descriptors.
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*
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* Note that <filename><gio/gunixconnection.h></filename> belongs to
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* the UNIX-specific GIO interfaces, thus you have to use the
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* <filename>gio-unix-2.0.pc</filename> pkg-config file when using it.
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*
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* Since: 2.22
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*/
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#include <gio/gsocketcontrolmessage.h>
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#include <gio/gunixfdmessage.h>
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#include <gio/gsocket.h>
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#include <unistd.h>
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#ifdef __linux__
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/* for getsockopt() and setsockopt() */
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#include <sys/types.h> /* See NOTES */
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#include <sys/socket.h>
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#include <errno.h>
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#include <string.h>
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#endif
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G_DEFINE_TYPE_WITH_CODE (GUnixConnection, g_unix_connection,
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G_TYPE_SOCKET_CONNECTION,
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g_socket_connection_factory_register_type (g_define_type_id,
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G_SOCKET_FAMILY_UNIX,
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G_SOCKET_TYPE_STREAM,
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G_SOCKET_PROTOCOL_DEFAULT);
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);
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/**
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* g_unix_connection_send_fd:
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* @connection: a #GUnixConnection
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* @fd: a file descriptor
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* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
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* @error: (allow-none): #GError for error reporting, or %NULL to ignore.
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*
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* Passes a file descriptor to the recieving side of the
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* connection. The recieving end has to call g_unix_connection_receive_fd()
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* to accept the file descriptor.
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*
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* As well as sending the fd this also writes a single byte to the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a %TRUE on success, %NULL on error.
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*
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* Since: 2.22
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*/
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gboolean
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g_unix_connection_send_fd (GUnixConnection *connection,
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gint fd,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage *scm;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (fd >= 0, FALSE);
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scm = g_unix_fd_message_new ();
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if (!g_unix_fd_message_append_fd (G_UNIX_FD_MESSAGE (scm), fd, error))
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{
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g_object_unref (scm);
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return FALSE;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket, NULL, NULL, 0, &scm, 1, 0, cancellable, error) != 1)
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/* XXX could it 'fail' with zero? */
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{
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g_object_unref (socket);
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g_object_unref (scm);
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return FALSE;
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}
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g_object_unref (socket);
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g_object_unref (scm);
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return TRUE;
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}
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/**
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* g_unix_connection_receive_fd:
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* @connection: a #GUnixConnection
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* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
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* @error: (allow-none): #GError for error reporting, or %NULL to ignore
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*
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* Receives a file descriptor from the sending end of the connection.
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* The sending end has to call g_unix_connection_send_fd() for this
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* to work.
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*
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* As well as reading the fd this also reads a single byte from the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a file descriptor on success, -1 on error.
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*
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* Since: 2.22
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**/
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gint
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g_unix_connection_receive_fd (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage **scms;
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gint *fds, nfd, fd, nscm;
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GUnixFDMessage *fdmsg;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), -1);
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_receive_message (socket, NULL, NULL, 0,
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&scms, &nscm, NULL, cancellable, error) != 1)
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/* XXX it _could_ 'fail' with zero. */
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{
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g_object_unref (socket);
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return -1;
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}
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g_object_unref (socket);
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if (nscm != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Expecting 1 control message, got %d"), nscm);
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for (i = 0; i < nscm; i++)
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g_object_unref (scms[i]);
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g_free (scms);
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return -1;
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}
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if (!G_IS_UNIX_FD_MESSAGE (scms[0]))
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Unexpected type of ancillary data"));
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g_object_unref (scms[0]);
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g_free (scms);
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return -1;
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}
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fdmsg = G_UNIX_FD_MESSAGE (scms[0]);
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g_free (scms);
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fds = g_unix_fd_message_steal_fds (fdmsg, &nfd);
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g_object_unref (fdmsg);
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if (nfd != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Expecting one fd, but got %d\n"), nfd);
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for (i = 0; i < nfd; i++)
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close (fds[i]);
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g_free (fds);
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return -1;
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}
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fd = *fds;
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g_free (fds);
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if (fd < 0)
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Received invalid fd"));
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fd = -1;
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}
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return fd;
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}
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static void
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g_unix_connection_init (GUnixConnection *connection)
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{
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}
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static void
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g_unix_connection_class_init (GUnixConnectionClass *class)
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{
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}
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/* TODO: Other stuff we might want to add are:
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void g_unix_connection_send_fd_async (GUnixConnection *connection,
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gint fd,
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gboolean close,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fds (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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GError **error);
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void g_unix_connection_send_fds_async (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fds_finish (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_receive_fd_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gint g_unix_connection_receive_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_credentials (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_send_credentials_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fake_credentials (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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GError **error);
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void g_unix_connection_send_fake_credentials_async (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fake_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_receive_credentials (GUnixConnection *connection,
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guint64 *pid,
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guint64 *uid,
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guint64 *gid,
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GError **error);
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void g_unix_connection_receive_credentials_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_receive_credentials_finish (GUnixConnection *connection,
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guint64 *pid,
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guint64 *uid,
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guint64 *gid,
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GError **error);
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gboolean g_unix_connection_create_pair (GUnixConnection **one,
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GUnixConnection **two,
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GError **error);
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*/
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/**
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* g_unix_connection_send_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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* Passes the credentials of the current user the receiving side
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* of the connection. The recieving end has to call
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* g_unix_connection_receive_credentials() (or similar) to accept the
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* credentials.
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*
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* As well as sending the credentials this also writes a single NUL
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* byte to the stream, as this is required for credentials passing to
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* work on some implementations.
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*
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* Other ways to exchange credentials with a foreign peer includes the
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Note that this function only works on Linux, currently.
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*
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* Returns: %TRUE on success, %FALSE if @error is set.
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*
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* Since: 2.26
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*/
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gboolean
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g_unix_connection_send_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *credentials;
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GSocketControlMessage *scm;
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GSocket *socket;
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gboolean ret;
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GOutputVector vector;
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guchar nul_byte[1] = {'\0'};
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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ret = FALSE;
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credentials = g_credentials_new ();
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vector.buffer = &nul_byte;
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vector.size = 1;
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scm = g_unix_credentials_message_new_with_credentials (credentials);
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket,
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NULL, /* address */
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&vector,
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1,
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&scm,
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1,
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G_SOCKET_MSG_NONE,
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cancellable,
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error) != 1)
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{
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g_prefix_error (error, _("Error sending credentials: "));
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goto out;
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}
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ret = TRUE;
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out:
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g_object_unref (socket);
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g_object_unref (scm);
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g_object_unref (credentials);
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return ret;
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}
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/**
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* g_unix_connection_receive_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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* Receives credentials from the sending end of the connection. The
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* sending end has to call g_unix_connection_send_credentials() (or
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* similar) for this to work.
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*
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* As well as reading the credentials this also reads (and discards) a
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* single byte from the stream, as this is required for credentials
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* passing to work on some implementations.
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*
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* Other ways to exchange credentials with a foreign peer includes the
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Returns: Received credentials on success (free with
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* g_object_unref()), %NULL if @error is set.
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*
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* Since: 2.26
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*/
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GCredentials *
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g_unix_connection_receive_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *ret;
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GSocketControlMessage **scms;
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gint nscm;
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GSocket *socket;
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gint n;
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volatile GType credentials_message_gtype;
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gssize num_bytes_read;
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#ifdef __linux__
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gboolean turn_off_so_passcreds;
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#endif
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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ret = NULL;
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scms = NULL;
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g_object_get (connection, "socket", &socket, NULL);
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/* On Linux, we need to turn on SO_PASSCRED if it isn't enabled
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* already. We also need to turn it off when we're done. See
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* #617483 for more discussion.
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*/
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#ifdef __linux__
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{
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gint opt_val;
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socklen_t opt_len;
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turn_off_so_passcreds = FALSE;
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opt_val = 0;
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opt_len = sizeof (gint);
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if (getsockopt (g_socket_get_fd (socket),
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SOL_SOCKET,
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SO_PASSCRED,
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&opt_val,
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&opt_len) != 0)
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{
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (errno),
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_("Error checking if SO_PASSCRED is enabled for socket: %s"),
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strerror (errno));
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goto out;
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}
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if (opt_len != sizeof (gint))
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{
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g_set_error (error,
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G_IO_ERROR,
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G_IO_ERROR_FAILED,
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_("Unexpected option length while checking if SO_PASSCRED is enabled for socket. "
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"Expected %d bytes, got %d"),
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(gint) sizeof (gint), (gint) opt_len);
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goto out;
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}
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if (opt_val == 0)
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{
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opt_val = 1;
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if (setsockopt (g_socket_get_fd (socket),
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SOL_SOCKET,
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SO_PASSCRED,
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&opt_val,
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sizeof opt_val) != 0)
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{
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (errno),
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_("Error enabling SO_PASSCRED: %s"),
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strerror (errno));
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goto out;
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}
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turn_off_so_passcreds = TRUE;
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}
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}
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#endif
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/* ensure the type of GUnixCredentialsMessage has been registered with the type system */
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credentials_message_gtype = G_TYPE_UNIX_CREDENTIALS_MESSAGE;
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num_bytes_read = g_socket_receive_message (socket,
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NULL, /* GSocketAddress **address */
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NULL,
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0,
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&scms,
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&nscm,
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NULL,
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cancellable,
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error);
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if (num_bytes_read != 1)
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{
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/* Handle situation where g_socket_receive_message() returns
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* 0 bytes and not setting @error
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*/
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if (num_bytes_read == 0 && error != NULL && *error == NULL)
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{
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g_set_error_literal (error,
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G_IO_ERROR,
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G_IO_ERROR_FAILED,
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_("Expecting to read a single byte for receiving credentials but read zero bytes"));
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}
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goto out;
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}
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|
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if (nscm != 1)
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{
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g_set_error (error,
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G_IO_ERROR,
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G_IO_ERROR_FAILED,
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_("Expecting 1 control message, got %d"),
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nscm);
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goto out;
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}
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if (!G_IS_UNIX_CREDENTIALS_MESSAGE (scms[0]))
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{
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g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Unexpected type of ancillary data"));
|
|
goto out;
|
|
}
|
|
|
|
ret = g_unix_credentials_message_get_credentials (G_UNIX_CREDENTIALS_MESSAGE (scms[0]));
|
|
g_object_ref (ret);
|
|
|
|
out:
|
|
|
|
#ifdef __linux__
|
|
if (turn_off_so_passcreds)
|
|
{
|
|
gint opt_val;
|
|
opt_val = 0;
|
|
if (setsockopt (g_socket_get_fd (socket),
|
|
SOL_SOCKET,
|
|
SO_PASSCRED,
|
|
&opt_val,
|
|
sizeof opt_val) != 0)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
g_io_error_from_errno (errno),
|
|
_("Error while disabling SO_PASSCRED: %s"),
|
|
strerror (errno));
|
|
goto out;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (scms != NULL)
|
|
{
|
|
for (n = 0; n < nscm; n++)
|
|
g_object_unref (scms[n]);
|
|
g_free (scms);
|
|
}
|
|
g_object_unref (socket);
|
|
return ret;
|
|
}
|