Linux: Blacklisted binaries

# 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("1.3.6.1.4.1.25623.1.0.150263");
  script_version("2022-09-02T10:10:40+0000");
  script_tag(name:"last_modification", value:"2022-09-02 10:10:40 +0000 (Fri, 02 Sep 2022)");
  script_tag(name:"creation_date", value:"2020-06-09 12:48:43 +0000 (Tue, 09 Jun 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: Blacklisted binaries");

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

  script_add_preference(name:"Blacklist", type:"entry", value:"binary1,binary2", id:1);

  script_tag(name:"summary", value:"Some binaries have security issues or should not be available
on the host for other reasons.

This script checks if any of the given binaries is installed on the host by using locate, whereis or which.");

  exit(0);
}

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

cmd = "[locate,whereis,which] BINARY";
title = "Blacklisted Binaries";
solution = "Disable Binary";
test_type = "SSH_Cmd";
default = script_get_preference("Blacklist", id:1);

if(!get_kb_item("login/SSH/success") || !sock = ssh_login_or_reuse_connection()) {
  value = "Error";
  compliant = "incomplete";
  note = "No SSH connection possible";
} else {
  blacklist = policy_build_list_from_string(str:default);

  foreach bin (blacklist) {
    if(ssh_find_bin(prog_name:bin, sock:sock)) {
      value += "," + bin;
    }
  }

  if(value) {
    value = str_replace(string:value, find:",", replace:"", count:1);
    compliant = "no";
  } else {
    compliant = "yes";
    value = "None";
  }
  note = "";
}

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

exit(0);