Linux: Get UID variables from /etc/login.defs

# Copyright (C) 2020 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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("1.3.6.1.4.1.25623.1.0.150137");
  script_version("2022-08-31T10:10:29+0000");
  script_tag(name:"last_modification", value:"2022-08-31 10:10:29 +0000 (Wed, 31 Aug 2022)");
  script_tag(name:"creation_date", value:"2020-02-19 09:51:58 +0000 (Wed, 19 Feb 2020)");
  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("Linux: Get UID variables from /etc/login.defs");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Policy");
  script_dependencies("compliance_tests.nasl", "read_etc_login_defs.nasl");
  script_mandatory_keys("Compliance/Launch");

  script_xref(name:"URL", value:"http://man7.org/linux/man-pages/man5/login.defs.5.html");

  script_tag(name:"summary", value:"The /etc/login.defs file defines the site-specific configuration
for the shadow password suite. This file is required. Absence of this file will not prevent system
operation, but will probably result in undesirable operation.

This script reads and stores variables SYS_UID_MAX, SYS_UID_MIN, UID_MAX and UID_MIN.

Note: This script only stores information for other Policy Controls.");

  exit(0);
}

if(get_kb_item("Policy/linux//etc/login.defs/ERROR")){
  exit(0);
}else{
  content = get_kb_item("Policy/linux//etc/login.defs/content");
  foreach line (split(content, keep:FALSE)){
    match = eregmatch(string:line, pattern:"^\s*(SYS_UID_MIN|SYS_UID_MAX|UID_MIN|UID_MAX)\s*([0-9]*)");
    if(match)
      set_kb_item(name:"Policy/linux//etc/login.defs/" + match[1], value:match[2]);
  }
}

exit(0);