Last Username - Windows

# SPDX-FileCopyrightText: 2010 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.96005");
  script_version("2024-02-28T14:37:42+0000");
  script_tag(name:"last_modification", value:"2024-02-28 14:37:42 +0000 (Wed, 28 Feb 2024)");
  script_tag(name:"creation_date", value:"2010-12-01 10:53:45 +0100 (Wed, 01 Dec 2010)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
  script_tag(name:"qod_type", value:"registry");
  script_name("Last Username - Windows");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_family("IT-Grundschutz");
  script_mandatory_keys("Compliance/Launch/GSHB", "Tools/Present/wmi");
  script_dependencies("smb_reg_service_pack.nasl", "GSHB/GSHB_WMI_OSInfo.nasl");

  script_tag(name:"summary", value:"The script detects if Last Login Username an Loginwarning is displayed.");

  exit(0);
}

include("smb_nt.inc");

host    = get_host_ip();
usrname = kb_smb_login();
domain  = kb_smb_domain();
if (domain){
  usrname = domain + '\\' + usrname;
}
passwd = kb_smb_password();

OSVER = get_kb_item("WMI/WMI_OSVER");

if(!OSVER || OSVER >< "none"){
  set_kb_item(name:"WMI/DontDisplayLastUserName", value:"error");
  set_kb_item(name:"WMI/LegalNoticeCaption", value:"error");
  set_kb_item(name:"WMI/LegalNoticeText", value:"error");
  log_message(port:0, proto: "IT-Grundschutz", data:string("No access to SMB host. Firewall is activated or there is not a Windows system."));
  exit(0);
}

handle = wmi_connect_reg(host:host, username:usrname, password:passwd);

if(!handle){
  security_message("wmi_connect_reg: WMI Connect failed.");
  set_kb_item(name:"WMI/DontDisplayLastUserName", value:"error");
  set_kb_item(name:"WMI/LegalNoticeCaption", value:"error");
  set_kb_item(name:"WMI/LegalNoticeText", value:"error");
  wmi_close(wmi_handle:handle);
  exit(0);
}

WINLOGONKEY = wmi_reg_enum_value(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon");
POLICIEKEY = wmi_reg_enum_value(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System");

if(!WINLOGONKEY){
  log_message(port:0, proto: "IT-Grundschutz", data:"Registry Path not found.");
  set_kb_item(name:"WMI/DontDisplayLastUserName", value:"error");
  set_kb_item(name:"WMI/LegalNoticeCaption", value:"error");
  set_kb_item(name:"WMI/LegalNoticeText", value:"error");
exit(0);
}

lastuser = wmi_reg_get_dword_val(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon", val_name:"DontDisplayLastUserName");

lastuserpol = wmi_reg_get_dword_val(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System", val_name:"DontDisplayLastUserName");

lenoca = wmi_reg_get_sz(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon", key_name:"LegalNoticeCaption");

lenocapol = wmi_reg_get_sz(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System", key_name:"LegalNoticeCaption");

lenote = wmi_reg_get_sz(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon", key_name:"LegalNoticeText");

lenotepol = wmi_reg_get_sz(wmi_handle:handle, key:"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System", key_name:"legalnoticetext");

if(!POLICIEKEY){
lastuserpol = 0;
lenocapol = "";
lenotepol = "";
}

if((lastuser == 1) || (lastuserpol == 1))
{
  set_kb_item(name:"WMI/DontDisplayLastUserName", value:"on");
}
else  {
      if((lastuser != 1) && (lastuserpol == 1))
              {
              set_kb_item(name:"WMI/DontDisplayLastUserName", value:"on");
              }
      else    {set_kb_item(name:"WMI/DontDisplayLastUserName", value:"off");
              }
}


if(lenoca >< "" && lenocapol >< "") {
  set_kb_item(name:"WMI/LegalNoticeCaption", value:"off");
}else{
set_kb_item(name:"WMI/LegalNoticeCaption", value:"on");
}

if(lenote >< "" && lenotepol >< "") {
  set_kb_item(name:"WMI/LegalNoticeText", value:"off");
}else{
  set_kb_item(name:"WMI/LegalNoticeText", value:"on");
}
wmi_close(wmi_handle:handle);
exit(0);