Microsoft Office: Encryption type for password protected Office Open XML files

##############################################################################
# OpenVAS Vulnerability Test
# $Id: office2013_openxml_encryption.nasl 11843 2018-10-11 14:33:21Z emoss $
#
# Check value for Encryption type for password protected Office Open XML files
#
# 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("1.3.6.1.4.1.25623.1.0.109052");
  script_version("$Revision: 11843 $");
  script_tag(name:"last_modification", value:"$Date: 2018-10-11 16:33:21 +0200 (Thu, 11 Oct 2018) $");
  script_tag(name:"creation_date", value:"2018-04-16 09:42:28 +0200 (Mon, 16 Apr 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 Office: Encryption type for password protected Office Open XML files');
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (c) 2018 Greenbone Networks GmbH");
  script_family("Policy");
  script_dependencies("secpod_ms_office_detection_900025.nasl", "os_detection.nasl");
  script_add_preference(name:"Value", type:"entry", value:"encryption type");
  script_mandatory_keys("Compliance/Launch", "Host/runs_windows", "MS/Office/Ver");
  script_tag(name:"summary", value:"This test checks the setting for policy 'Encryption type for
password protected Office Open XML files' for Microsoft Office 2013 (at least) on Windows hosts.

The setting allows you to specify an encryption type for Office Open XML files.");
  exit(0);
}

include("smb_nt.inc");
include("policy_functions.inc");
include("host_details.inc");
include("secpod_smb_func.inc");
include("version_func.inc");

cpe = get_app_version(cpe:"cpe:/a:microsoft:office");
if(!cpe){
	policy_logging(text:'Not found any Microsoft Office installation.');
	exit(0);
}
office_year = substr(cpe,0,3);

full_version = get_kb_item("MS/Office/Ver");
if(version_is_less(version:full_version, test_version:'15')){
	policy_logging(text:'Not found at least Microsoft Office 2013 installation.');
	exit(0);
}
major_version = substr(full_version,0,3);

title = 'Encryption type for password protected Office Open XML files';
fixtext = 'Set following UI path accordingly:
User Configuration/Administrative Templates/Microsoft Office ' + office_year + '/Security Settings/' + title;
type = 'HKU';
key_root = 'Software\\Policies\\Microsoft\\Office\\' + major_version + '\\common\\security';
item = 'openxmlencryption';
default = script_get_preference('Value');
v = make_array();

uids = registry_enum_keys(key:'SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\ProfileList', type:'HKLM');
foreach uid (uids){
  if(uid =~ "S-1-5-21-"){
    if(registry_key_exists(key:uid, type:'HKU')){
      key = uid + '\\' + key_root;
      value = registry_get_sz(key:key, item:item, type:type);
      if(!value){
        value = 'None';
      }
      v = uid + ': ' + value + '\n';
      policy_set_kb_hcu(id:uid, val:value);
      if(value != default){
        compliant = 'no';
      }
    }
  }
}

if(!compliant){
  compliant = 'yes';
}

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

exit(0);