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/*
* Copyright (C) 2010-2011 Robert Ancell.
* Author: Robert Ancell <robert.ancell@canonical.com>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version. See http://www.gnu.org/copyleft/gpl.html the full text of the
* license.
*/
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "dmrc.h"
#include "configuration.h"
#include "privileges.h"
#include "user-list.h"
GKeyFile *
dmrc_load (CommonUser *user)
{
GKeyFile *dmrc_file;
gchar *path;
gboolean have_dmrc, drop_privileges;
dmrc_file = g_key_file_new ();
/* Load from the user directory, if this fails (e.g. the user directory
* is not yet mounted) then load from the cache */
path = g_build_filename (common_user_get_home_directory (user), ".dmrc", NULL);
/* Guard against privilege escalation through symlinks, etc. */
drop_privileges = geteuid () == 0;
if (drop_privileges)
privileges_drop (common_user_get_uid (user), common_user_get_gid (user));
have_dmrc = g_key_file_load_from_file (dmrc_file, path, G_KEY_FILE_KEEP_COMMENTS, NULL);
if (drop_privileges)
privileges_reclaim ();
g_free (path);
/* If no ~/.dmrc, then load from the cache */
if (!have_dmrc)
{
gchar *filename, *cache_dir;
filename = g_strdup_printf ("%s.dmrc", common_user_get_name (user));
cache_dir = config_get_string (config_get_instance (), "LightDM", "cache-directory");
path = g_build_filename (cache_dir, "dmrc", filename, NULL);
g_free (filename);
g_free (cache_dir);
g_key_file_load_from_file (dmrc_file, path, G_KEY_FILE_KEEP_COMMENTS, NULL);
g_free (path);
}
return dmrc_file;
}
void
dmrc_save (GKeyFile *dmrc_file, CommonUser *user)
{
gchar *path, *filename, *cache_dir, *dmrc_cache_dir;
gchar *data;
gsize length;
gboolean drop_privileges;
data = g_key_file_to_data (dmrc_file, &length, NULL);
/* Update the users .dmrc */
path = g_build_filename (common_user_get_home_directory (user), ".dmrc", NULL);
/* Guard against privilege escalation through symlinks, etc. */
drop_privileges = geteuid () == 0;
if (drop_privileges)
privileges_drop (common_user_get_uid (user), common_user_get_gid (user));
g_debug ("Writing %s", path);
g_file_set_contents (path, data, length, NULL);
if (drop_privileges)
privileges_reclaim ();
g_free (path);
/* Update the .dmrc cache */
cache_dir = config_get_string (config_get_instance (), "LightDM", "cache-directory");
dmrc_cache_dir = g_build_filename (cache_dir, "dmrc", NULL);
g_free (cache_dir);
if (g_mkdir_with_parents (dmrc_cache_dir, 0700) < 0)
g_warning ("Failed to make DMRC cache directory %s: %s", dmrc_cache_dir, strerror (errno));
filename = g_strdup_printf ("%s.dmrc", common_user_get_name (user));
path = g_build_filename (dmrc_cache_dir, filename, NULL);
g_file_set_contents (path, data, length, NULL);
g_free (data);
g_free (path);
g_free (filename);
g_free (dmrc_cache_dir);
}
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