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Merge branch 'wip/gdbus-even-when-setcap' into 'master'

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Resolve GDBus regressions in setcap/setgid programs

Closes #2305

See merge request GNOME/glib!1920
This commit is contained in:
Philip Withnall 2021-02-03 11:28:20 +00:00
commit 018ae0982c
1 changed files with 33 additions and 3 deletions
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36
gio/gdbusaddress.c
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@ -1286,7 +1286,7 @@ g_dbus_address_get_for_bus_sync (GBusType bus_type,
GCancellable *cancellable,
GError **error)
{
gboolean is_setuid = GLIB_PRIVATE_CALL (g_check_setuid) ();
gboolean has_elevated_privileges = GLIB_PRIVATE_CALL (g_check_setuid) ();
gchar *ret, *s = NULL;
const gchar *starter_bus;
GError *local_error;
@ -1330,7 +1330,11 @@ g_dbus_address_get_for_bus_sync (GBusType bus_type,
switch (bus_type)
{
case G_BUS_TYPE_SYSTEM:
ret = !is_setuid ? g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS")) : NULL;
if (has_elevated_privileges)
ret = NULL;
else
ret = g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
if (ret == NULL)
{
ret = g_strdup ("unix:path=/var/run/dbus/system_bus_socket");
@ -1338,7 +1342,33 @@ g_dbus_address_get_for_bus_sync (GBusType bus_type,
break;
case G_BUS_TYPE_SESSION:
ret = !is_setuid ? g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS")) : NULL;
if (has_elevated_privileges)
{
#ifdef G_OS_UNIX
if (geteuid () == getuid ())
{
/* Ideally we shouldn't do this, because setgid and
* filesystem capabilities are also elevated privileges
* with which we should not be trusting environment variables
* from the caller. Unfortunately, there are programs with
* elevated privileges that rely on the session bus being
* available. We already prevent the really dangerous
* transports like autolaunch: and unixexec: when our
* privileges are elevated, so this can only make us connect
* to the wrong AF_UNIX or TCP socket. */
ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
}
else
#endif
{
ret = NULL;
}
}
else
{
ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
}
if (ret == NULL)
{
ret = get_session_address_platform_specific (&local_error);