Linux: kern.* in /etc/rsyslog.conf

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.0.150168");
  script_version("2023-07-27T05:05:09+0000");
  script_tag(name:"last_modification", value:"2023-07-27 05:05:09 +0000 (Thu, 27 Jul 2023)");
  script_tag(name:"creation_date", value:"2020-03-17 10:52:32 +0000 (Tue, 17 Mar 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: kern.* in /etc/rsyslog.conf");

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

  script_xref(name:"URL", value:"https://linux.die.net/man/5/rsyslog.conf");

  script_add_preference(name:"Value", type:"entry", value:"/var/log/kernel.log", id:1);

  script_tag(name:"summary", value:"Log all kernel events to local log file.");

  exit(0);
}

include("policy_functions.inc");

cmd = "grep 'kern.*' /etc/rsyslog.conf";
title = "kern.* in /etc/rsyslog.conf";
solution = "Add 'kern.* FILE' to /etc/rsyslog.conf";
test_type = "SSH_Cmd";
default = script_get_preference("Value", id:1);

if(get_kb_item("Policy/linux//etc/rsyslog.conf/ERROR")){
  value = "Error";
  compliant = "incomplete";
  comment = "No SSH connection to host";
}else if(get_kb_item("Policy/linux//etc/rsyslog.conf/content/ERROR")){
  value = "Error";
  compliant = "incomplete";
  comment = "Can not read /etc/rsyslog.conf";
}else{
  content = get_kb_item("Policy/linux//etc/rsyslog.conf/content");
  grep = egrep(string:content, pattern:"kern\.\*");

  if(grep){
    foreach line (split(grep)){
      if(line =~ "^\s*#")
        continue;

      file = eregmatch(string:line, pattern:"kern\.\*\s+(.+)");
      if(file)
        value += "," + chomp(file[1]);
    }
  }

  if(value)
    value = str_replace(string:value, find:",", replace:"", count:1);

  if(!value){
    value = "None";
    comment = "Can not find kern.emerg in /etc/rsyslog.conf";
  }

  compliant = policy_settings_lists_match(value:value, set_points:default, sep:",");
}

policy_reporting(result:value, default:default, compliant:compliant, fixtext:solution,
  type:test_type, test:cmd, info:comment);
policy_set_kbs(type:test_type, cmd:cmd, default:default, solution:solution, title:title,
  value:value, compliant:compliant);

exit(0);