ZSQL: Check for users with GRANT ANY PRIVILEGE permission

# 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("1.3.6.1.4.1.25623.1.0.115004");
  script_version("2022-08-31T10:10:28+0000");
  script_tag(name:"last_modification", value:"2022-08-31 10:10:28 +0000 (Wed, 31 Aug 2022)");
  script_tag(name:"creation_date", value:"2020-03-27 10:05:57 +0000 (Fri, 27 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("ZSQL: Check for users with GRANT ANY PRIVILEGE permission");

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

  script_xref(name:"URL", value:"https://support.huawei.com/enterprise/en/doc/EDOC1100098622");
  script_tag(name:"summary", value:"Searches for users with GRANT ANY PRIVILEGE permission and
checks whether they are authorized to have it. Users with this permission can grant any permission
to any user. Therefore, grant this permission only when absolutely necessary.");

  exit(0);
}

include("policy_functions.inc");

cmd = "SELECT USERNAME, PRIVILEGE FROM DB_USERS_SYS_PRIVS WHERE USERNAME = 'user_name' AND PRIVILEGE = 'GRANT ANY PRIVILEGE';";
title = "List users with GRANT ANY PRIVILEGE permission";
solution ="1) Revoke GRANT ANY PRIVILEGE FROM user_name;
2) Revoke GRANT ANY PRIVILEGE FROM role_name;";
test_type = "SQL_Query";
default = "User:Sys, Roles:DBA";

user_list = make_list();
role_list = make_list();

if(get_kb_item("Policy/zsql/zsql_db_user_sys_privs/ssh/ERROR") || get_kb_item("Policy/zsql/zsql_role_sys_privs/ssh/ERROR")){
  compliant = "incomplete";
  value = "error";
  comment = "No SSH connection to host";
}else if(get_kb_item("Policy/zsql/zsql_db_user_sys_privs/ERROR") || get_kb_item("Policy/zsql/zsql_role_sys_privs/ERROR")){
  compliant = "incomplete";
  value = "error";
  comment = "Cannot read table DB_USER_SYS_PRIVS or ROLE_SYS_PRIVS";
}else if((!grantee_list = get_kb_list("Policy/zsql/zsql_db_user_sys_privs/*")) ||
  (!role_sys_privs_list = get_kb_list("Policy/zsql/zsql_role_sys_privs/*"))){
  compliant = "incomplete";
  value = "error";
  comment = "Cannot parse table DB_USER_SYS_PRIVS or DB_USER_SYS_PRIVS";
}else{
  foreach key1(keys(grantee_list)){
    if( key1 =~ "GRANT ANY PRIVILEGE"){
      user = eregmatch(string:key1, pattern:"Policy/zsql/zsql_db_user_sys_privs/([^/]+)/*");
      if(user)
        user_list = make_list(user_list, user[1]);
    }
  }

  foreach key2(keys(role_sys_privs_list)){
    if(key2 =~ "GRANT ANY PRIVILEGE"){
      role = eregmatch(string:key2, pattern:"Policy/zsql/zsql_role_sys_privs/([^/]+)/*");
      if(role)
        role_list = make_list(role_list, role[1]);
    }
  }

  value = "User:" + policy_build_string_from_list(list:user_list, sep:",");
  value += ", Roles:" + policy_build_string_from_list(list:role_list, sep:",");

  compliant = policy_settings_lists_match(value:toupper(value), set_points:toupper(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);