WGN04-WP30-AnnexWGN04-WP30-Annex

Overview Overview Directory SurveyDirectory Survey

danny.van-roosbroek@eurocontrol.int robert.willmott@makra.demon.co.uk

New Orleans - 15/16 Nov 2004

AFSG/PG

IntroductionIntroduction AMHS expects support of X.500 Directory DAP Doc 9705 specifies ATN Specific Dir Information EUR-AMHS and SPACE originally mandated

Directory Some ATSPs interest in RFC’s LDAP - for cost

effectiveness Do products support ATN Specific information over

DAP? - over LDAP? over WEB? So - A limited survey to discover the reality …..

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Rationale & Problem Rationale & Problem StatementStatement

X.500 DAP is regarded as ‘expensive’ LDAP/WEB are regarded as ‘cost effective’ -

free But ATN Directory specifies special ATN

information Do DAP/LDAP/WEB products support ATN

information? Will costs increase for ATN Information

support?

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ATN Directory User TypesATN Directory User Types

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X.500 Directory

X.520/521

X.402

ATN

X.509

WEB Gate

LDAP Gate

Administrator

General Users

AMHS User

AMHS UA or MTA‘Online’

LDAP UserLDAPServer

DAP

LDAP<>DAP

DAP

XML-HTTP<>DAP

Users Gateways Servers

LDAP

Group 1and 2 Systems

Group 3 Systems

(Based on Directory Product Survey)

Schema PrinciplesSchema Principles

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Schema Definitions DIT Elements

Object Classes

Attribute Types

Attribute Syntaxes

DIT Structure DIT

Entries

Attributes

Values

uses

uses

uses belongs to

belongs to

belongs to

rules for

rules for

rules for

rules for

Schema Definition - 1Schema Definition - 1 Object Class

Lists Attribute Types in an EntryDefined by name + Object Identifier + ListNo software to implement in DUAs/DSAs

Attribute TypeNames an Attribute TypeDefined by Name + Object Identifier +

Attribute SyntaxNo software to implement in DUAs/DSAs

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No problems - only user configuration requiredNo problems - only user configuration required

Schema Definition - 2Schema Definition - 2

Attribute Syntax (e.g. Integer, string …)Describes the encoding of an Attribute Value

on the communications lineDefined by Object Identifier + Name + ASN.1 ASN.1

specification of valuespecification of valueSuppliers must write softwareSuppliers must write software

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Specifying new Attribute Syntaxes costs moneySpecifying new Attribute Syntaxes costs money

ATN Schema AdditionsATN Schema Additions ATN adds several new Object Classes - no

problem ATN adds several new Attribute Types using

existing (Standard Syntaxes) - no problem ATN adds two new attributes with new syntaxes

Global-Domain-Identifier - now resolved!MTCU-Characteristics - a complex syntax - needs MTCU-Characteristics - a complex syntax - needs

review!review!

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Research - How?Research - How?

Suppliers questionnaire:What schema elements are available as standard

for DAP, LDAP (and WEB) access?Do tools exist for configuration of new schema

elements?What schema elements need new software?

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The Surveyed SuppliersThe Surveyed Suppliers

ISODE - NEXOR - Data Connections - HP - ATOS-Origin

SUN - Critical Path (ICL) - Bull - CDC - SUN - Critical Path (ICL) - Bull - CDC - Computer Associates - Fujitsu - IBM - ISOCOR - Computer Associates - Fujitsu - IBM - ISOCOR - Maxware - Microsoft - NCR - Siemens - Sun - Maxware - Microsoft - NCR - Siemens - Sun - Syntegra - Tandem - Unisys …...Syntegra - Tandem - Unisys …...

COMSOFT - Thales - Avitech - Copperchase - Boldon James - Global Weather

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Results - AnalysisResults - Analysis

One supplier supports the ATN Extensions in DAP

No suppliers support ATN Extensions in LDAP ATN extensions inevitably incur extra cost ICAO could consider re-defining the ‘expensive’

attributes WEB (HTTP) needs no new syntax definition (but

requires a WEB site gateway

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Recommendations - 1Recommendations - 1

User Communities should avoid defining Attribute Types using complex, non-standard syntaxes

ICAO WGN should re-define the MTCU-Characteristics Attribute Type (the Global Domain Attribute has now been re-defined)

ICAO WGN should consider whether LDAP is required ICAO must specify the ATN-specific schema elements in

Backus Naur Form if LDAP is to be used XML should be avoided No further specification is required for HTTP access

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Recommendations - 2 Recommendations - 2 Possible ArchitecturePossible Architecture

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ATN-DirectoryDIB

WEBGATE

LDAPGATE

Direct DAP

Access

WEB Browser Access

LDAP Access

DAP AccessMTA & UA Processes +

Dir Administrators

AMHS Users

General Users

(Based on Directory Product Survey)

Thank YouThank You