Microsoft Windows 10: Disable new DMA devices when this computer is locked

##############################################################################
# OpenVAS Vulnerability Test
# $Id: win_dma_devices_locked.nasl 11337 2018-09-11 14:23:53Z emoss $
#
# Check value for Disable new DMA devices when this computer is locked
#
# Authors:
# Emanuel Moss <[email protected]>
#
# Copyright:
# Copyright (c) 2018 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.109428");
  script_version("$Revision: 11337 $");
  script_tag(name:"last_modification", value:"$Date: 2018-09-11 16:23:53 +0200 (Tue, 11 Sep 2018) $");
  script_tag(name:"creation_date", value:"2018-06-26 12:50:58 +0200 (Tue, 26 Jun 2018)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:H/Au:S/C:N/I:N/A:N");
  script_tag(name:"qod", value:"97");
  script_name('Microsoft Windows 10: Disable new DMA devices when this computer is locked');
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (c) 2018 Greenbone Networks GmbH");
  script_family("Policy");
  script_dependencies("smb_reg_service_pack.nasl", "os_detection.nasl");
  script_add_preference(name:"Value", type:"radio", value:"1;0");
  script_mandatory_keys("Compliance/Launch");
  script_tag(name:"summary", value:"This test checks the setting for policy
'Disable new DMA devices when this computer is locked' on Windows hosts
(at least Windows 10).

The setting allows to block direct memory access (DMA) for all hot pluggable
PCI downstream ports until a user logs into Windows.");
  exit(0);
}

include("smb_nt.inc");
include("policy_functions.inc");

if(!get_kb_item("SMB/WindowsVersion")){
  policy_logging(text:'Host is no Microsoft Windows System or it is not possible
to query the registry.');
  exit(0);
}

HostDetails = get_kb_list("HostDetails");
if("cpe:/o:microsoft:windows_10" >!< HostDetails){
  policy_logging(text:'Host is not a Microsoft Windows 10 system.
This setting applies to Windows 10 systems only.');
  exit(0);
}

title = 'Disable new DMA devices when this computer is locked';
fixtext = 'Set following UI path accordingly:
Computer Configuration/Administrative Templates/Windows Components/BitLocker Drive Encryption/' + title;
type = 'HKLM';
key = 'Software\\Policies\\Microsoft\\FVE';
item = 'DisableExternalDMAUnderLock';
value = registry_get_dword(key:key, item:item, type:type);
default = script_get_preference('Value');

if(value == ''){
  value = '0';
}

if(int(value) == int(default)){
  compliant = 'yes';
}else{
  compliant = 'no';
}

policy_logging(text:'"' + title + '" is set to: ' + value);
policy_add_oid();
policy_set_dval(dval:default);
policy_fixtext(fixtext:fixtext);
policy_control_name(title:title);
policy_set_kb(val:value);
policy_set_compliance(compliant:compliant);

exit(0);