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/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
* Copyright © 2018 Red Hat, Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <gio/gio.h>
#include "libglnx.h"
#include "flatpak-portal-app-info.h"
#include "flatpak-portal-error.h"
G_LOCK_DEFINE (app_infos);
static GHashTable *app_infos;
static void
ensure_app_infos (void)
{
if (app_infos == NULL)
app_infos = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL, (GDestroyNotify) g_key_file_unref);
}
static GKeyFile *
lookup_cached_app_info_by_sender (const char *sender)
{
GKeyFile *keyfile = NULL;
G_LOCK (app_infos);
keyfile = g_hash_table_lookup (app_infos, sender);
if (keyfile)
g_key_file_ref (keyfile);
G_UNLOCK (app_infos);
return keyfile;
}
static void
invalidate_cached_app_info_by_sender (const char *sender)
{
G_LOCK (app_infos);
g_hash_table_remove (app_infos, sender);
G_UNLOCK (app_infos);
}
static void
add_cached_app_info_by_sender (const char *sender, GKeyFile *keyfile)
{
G_LOCK (app_infos);
g_hash_table_add (app_infos, g_key_file_ref (keyfile));
G_UNLOCK (app_infos);
}
/* Returns NULL on failure, keyfile with name "" if not sandboxed, and full app-info otherwise */
static GKeyFile *
parse_app_id_from_fileinfo (int pid)
{
g_autofree char *root_path = NULL;
glnx_autofd int root_fd = -1;
glnx_autofd int info_fd = -1;
struct stat stat_buf;
g_autoptr(GError) local_error = NULL;
g_autoptr(GMappedFile) mapped = NULL;
g_autoptr(GKeyFile) metadata = NULL;
root_path = g_strdup_printf ("/proc/%u/root", pid);
root_fd = openat (AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
if (root_fd == -1)
{
/* Not able to open the root dir shouldn't happen. Probably the app died and
* we're failing due to /proc/$pid not existing. In that case fail instead
of treating this as privileged. */
g_info ("Unable to open %s", root_path);
return NULL;
}
metadata = g_key_file_new ();
info_fd = openat (root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
if (info_fd == -1)
{
if (errno == ENOENT)
{
/* No file => on the host */
g_key_file_set_string (metadata, FLATPAK_METADATA_GROUP_APPLICATION,
FLATPAK_METADATA_KEY_NAME, "");
return g_steal_pointer (&metadata);
}
return NULL; /* Some weird error => failure */
}
if (fstat (info_fd, &stat_buf) != 0 || !S_ISREG (stat_buf.st_mode))
return NULL; /* Some weird fd => failure */
mapped = g_mapped_file_new_from_fd (info_fd, FALSE, &local_error);
if (mapped == NULL)
{
g_warning ("Can't map .flatpak-info file: %s", local_error->message);
return NULL;
}
if (!g_key_file_load_from_data (metadata,
g_mapped_file_get_contents (mapped),
g_mapped_file_get_length (mapped),
G_KEY_FILE_NONE, &local_error))
{
g_warning ("Can't load .flatpak-info file: %s", local_error->message);
return NULL;
}
return g_steal_pointer (&metadata);
}
GKeyFile *
flatpak_invocation_lookup_app_info (GDBusMethodInvocation *invocation,
GCancellable *cancellable,
GError **error)
{
GDBusConnection *connection = g_dbus_method_invocation_get_connection (invocation);
const gchar *sender = g_dbus_method_invocation_get_sender (invocation);
g_autoptr(GDBusMessage) msg = NULL;
g_autoptr(GDBusMessage) reply = NULL;
g_autoptr(GVariantIter) iter = NULL;
const char *key;
GVariant *value;
GKeyFile *keyfile;
keyfile = lookup_cached_app_info_by_sender (sender);
if (keyfile)
return keyfile;
msg = g_dbus_message_new_method_call ("org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionCredentials");
g_dbus_message_set_body (msg, g_variant_new ("(s)", sender));
reply = g_dbus_connection_send_message_with_reply_sync (connection, msg,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
30000,
NULL,
cancellable,
error);
if (reply == NULL)
return NULL;
if (g_dbus_message_get_message_type (reply) == G_DBUS_MESSAGE_TYPE_METHOD_RETURN)
{
GVariant *body = g_dbus_message_get_body (reply);
g_variant_get (body, "(a{sv})", &iter);
while (g_variant_iter_loop (iter, "{&sv}", &key, &value))
{
if (strcmp (key, "ProcessID") == 0)
{
guint32 pid = g_variant_get_uint32 (value);
g_variant_unref (value);
keyfile = parse_app_id_from_fileinfo (pid);
break;
}
}
}
if (keyfile == NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Can't find peer app id");
return NULL;
}
add_cached_app_info_by_sender (sender, keyfile);
return keyfile;
}
static void
name_owner_changed (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
const char *name, *from, *to;
g_variant_get (parameters, "(sss)", &name, &from, &to);
if (name[0] == ':' &&
strcmp (name, from) == 0 &&
strcmp (to, "") == 0)
{
invalidate_cached_app_info_by_sender (name);
}
}
void
flatpak_connection_track_name_owners (GDBusConnection *connection)
{
ensure_app_infos ();
g_dbus_connection_signal_subscribe (connection,
"org.freedesktop.DBus",
"org.freedesktop.DBus",
"NameOwnerChanged",
"/org/freedesktop/DBus",
NULL,
G_DBUS_SIGNAL_FLAGS_NONE,
name_owner_changed,
NULL, NULL);
}
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