ZSQL: Check For Unknown Users In Database

# 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("1.3.6.1.4.1.25623.1.0.115000");
  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 15:29:57 +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("ZSQL: Check For Unknown Users In Database");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Policy");
  script_dependencies("compliance_tests.nasl", "zsql_db_users.nasl");
  script_mandatory_keys("Compliance/Launch");
  # Need to stay, although not used.
  script_add_preference(name:"Value", type:"entry", value:"user1, user2", id:1);

  script_xref(name:"URL", value:"https://support.huawei.com/enterprise/en/doc/EDOC1100098622");
  script_tag(name:"summary", value:"Checks whether there are unknown users in DB_USERS. Unknown users may threaten database security.");

  exit(0);
}

include("policy_functions.inc");

cmd = "SELECT USERNAME FROM DB_USERS;";
title = "List DB users";
solution = "DROP USER user_name CASCADE;";
test_type = "Manual Check";
default = "None";

if(get_kb_item("Policy/zsql/zsql_db_users/ssh/Error")){
  compliant = "incomplete";
  value = "error";
  comment = "No SSH connection to host";
}else if(get_kb_item("Policy/zsql/zsql_db_users/ERROR")){
  compliant = "incomplete";
  value = "error";
  comment = "Can not read table DB_USERS";
}else if(!user_list = get_kb_list("Policy/zsql/zsql_db_users/username/*")){
  compliant = "incomplete";
  value = "error";
  comment = "Can not parse table DB_USERS";
}else{
  foreach key (keys(user_list)){
    value += "," + user_list[key];
  }
  if(value)
    value = str_replace(string:value, find:",", replace:"", count:1);
  else
    value = "None";

  compliant = "incomplete";
  comment = "No automatic test possible. Please check for unknown users.";
}


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);