openGauss: Revoking the CREATE Permission from a User with the PUBLIC Role

# 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("1.3.6.1.4.1.25623.1.0.150369");
  script_version("2025-01-22T05:38:11+0000");
  script_tag(name:"last_modification", value:"2025-01-22 05:38:11 +0000 (Wed, 22 Jan 2025)");
  script_tag(name:"creation_date", value:"2020-11-11 15:21:37 +0000 (Wed, 11 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("openGauss: Revoking the CREATE Permission from a User with the PUBLIC Role");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Policy");
  script_dependencies("gb_huawei_opengauss_ssh_login_detect.nasl", "compliance_tests.nasl", "opengauss_authentication_information.nasl");
  script_mandatory_keys("huawei/opengauss/detected", "Compliance/Launch");

  script_xref(name:"URL", value:"https://opengauss.org");

  script_tag(name:"summary", value:"A common user can create malicious functions with the same names as system
functions if the user has the PUBLIC role. In this way, other users can call these
malicious functions by mistake to compromise database security.
If the PUBLIC role has the CREATE permission, any user having this role can create,
view, and modify tables or other database objects in the tablespace of this role.
Therefore, it is recommended that the PUBLIC role do not have the CREATE
permission.");

  exit(0);
}

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

cmd = "SELECT CAST(has_schema_privilege('public','public','CREATE') AS TEXT);";
title = "Revoking the CREATE Permission from a User with the PUBLIC Role ";
solution = "REVOKE CREATE ON SCHEMA PUBLIC FROM public;";
default = "false";
test_type = "SQL_Query";

if( ! get_kb_item( "login/SSH/success" ) || ! sock = ssh_login_or_reuse_connection() ) {
  compliant = "incomplete";
  value = "error";
  comment = "No SSH connection to host";
}else if ( ! value = policy_gsql_cmd( socket:sock, query:cmd ) ) {
  compliant = "incomplete";
  value = "error";
  comment = "SQL command did not return anything";
}else if ( value =~ "failed to connect" ) {
  compliant = "incomplete";
  value = "error";
  comment = "No connection to database";
}else{
  value = ereg_replace( string:chomp( value ), pattern:"^\s+", replace:"" );
  compliant = policy_setting_exact_match( value:value, set_point:default );
}

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 );