GaussDB Kernel: Controlling the Permission to Execute the SECURITY DEFINER Function

# 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("1.3.6.1.4.1.25623.1.0.150464");
  script_version("2020-12-23T08:48:08+0000");
  script_tag(name:"last_modification", value:"2020-12-23 08:48:08 +0000 (Wed, 23 Dec 2020)");
  script_tag(name:"creation_date", value:"2020-11-20 10:52:10 +0000 (Fri, 20 Nov 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("GaussDB Kernel: Controlling the Permission to Execute the SECURITY DEFINER Function");

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

  script_tag(name:"summary", value:"Because the SECURITY DEFINER function is executed with the privileges of the
user that created it, ensure that this function is not misused. For security purposes,
set search_path to exclude any schemas writable by untrusted users. This prevents
malicious users from creating objects that mask objects used by the function.");

  exit(0);
}

include( "policy_functions.inc" );

cmd = "show search_path; SELECT CAST(has_function_privilege('public', 'function_name()', 'EXECUTE') AS TEXT);";
title = "Controlling the Permission to Execute the SECURITY DEFINER Function";
solution = "SET search_path = VALUE;";
default = "N/A";
test_type = "Manual Check";

compliant = "incomplete";
value = "None";
comment = "Please check the value manually.";

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 );