LDAP Server Detection

#
# (C) Tenable Network Security, Inc.
#



include("compat.inc");

if (description) {
  script_id(20870);
  script_version("1.18");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/09/29");

  script_name(english:"LDAP Server Detection");
  script_summary(english:"Detects an LDAP server.");

  script_set_attribute(attribute:"synopsis", value:
"An LDAP server was detected on the remote host.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a Lightweight Directory Access Protocol
(LDAP) server. LDAP is a protocol for providing access to directory
services over TCP/IP.");
  script_set_attribute(attribute:"see_also", value:"https://en.wikipedia.org/wiki/LDAP");
  script_set_attribute(attribute:"risk_factor", value:"None");
  script_set_attribute(attribute:"solution", value:"n/a");

  script_set_attribute(attribute:"plugin_publication_date", value: "2006/02/10");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"asset_inventory", value:"True");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Service detection");

  script_copyright(english:"This script is Copyright (C) 2006-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("find_service2.nasl");
  script_require_ports("Services/unknown", "www/possible_wls", 389, 626, 3268, 3269);

  exit(0);
}


include("global_settings.inc");
include("misc_func.inc");
include("kerberos_func.inc");
include("ldap_func.inc");
include("audit.inc");

# default port list
ports = make_list(389, 636, 3268, 3269);

if (thorough_tests && !get_kb_item("global_settings/disable_service_discovery"))
{
  additional_ports = get_unknown_svc_list();
  if (!empty_or_null(additional_ports))
  {
    ports = make_list(ports, additional_ports);
  }
}

# add the weblogic ports to the search
possible_wls_ports = get_kb_list('www/possible_wls');
if (!empty_or_null(possible_wls_ports))
{
  ports = make_list(ports, possible_wls_ports);
}

# remove duplicates and fork!
ports = list_uniq(ports);
port = branch(ports);

if (!get_port_state(port))
{
  audit(AUDIT_PORT_CLOSED, port);
}

soc = open_sock_tcp(port);
if (!soc)
{
  audit(AUDIT_SOCK_FAIL, port);
}

ldap_init(socket:soc);
bind = ldap_bind_request();
ret = ldap_request_sendrecv(data:bind);
close(soc);

if (!isnull(ret) && ret[0] == LDAP_BIND_RESPONSE)
{
  # if channel is cleartext, we should probably
  # flag this for PCI
  if('TLS confidentiality required' >!< ret[1] && # you can force TLS on openldap
       get_port_transport(port) == ENCAPS_IP)
  {
    report = 'The remote LDAP server accepts cleartext authentication.';
    set_kb_item(name:"PCI/ClearTextCreds/" + port, value:report);
  }

  # Register and report the service.
  register_service(port:port, ipproto:"tcp", proto:"ldap");
  security_note(port);
}
else
{
  audit(AUDIT_NOT_DETECT, "ldap", port);
}