Concepten. electronic messaging systems. 1984: CCITT X.400 aanbevelingen MHS. ISO/ITU-T standaard: Message Handling System (MHS) / X.

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1 electronic messaging systems ISO/ITU-T standaard: Message Handling System (MHS) / X.400 ISP standaard: Simple Mail Transfer Protocol (SMTP) electronic messaging system applications MHS / X.400: Inter-Personal Messaging Electronic Data Interchange 1984: CCITT X.400 aanbevelingen Message Handling System (MHS) message transfer system interpersonal messaging 1988: parallelle standaarden van CCITT en ISO CCITT - MHS / X.400 aanbevelingen ISO - Message Oriented Text Interchange System (MOTIS) / ISO/IEC standaarden message store access units electronic data interchange 1992: parallelle standaarden van CCITT (ITU-T sinds 1993) en ISO (samen met IEC) onder dezelfde naam MHS ITU-T X.400 / ISO/IEC Concepten MHS model MHS functional model Message Handling Environment (MHE) Message Handling System (MHS) MHS Agent () Message Transfer System () :, Message Store, Access Unit Message Transfer Agent () MHE non-mhs systems, e.g. Tlx, Fax, Postal distributie van MHS AU geografisch verspreide s store-and-forward communicatie management en beheer Management Domain (MD) ITU-T beheer of privé P1 P7 P1 MS P1 structuur van message message = envelope + content content = header + body parts 5 7

2 MHS message structure content heading body part body part envelope definition of services in an object-oriented topdown way graphic form ASN.1 notation concepts abstract object abstract port abstract refinement abstract procedure: bind, unbind, operation, error body (equivalent to macros in RO notation) MHS heading body envelope content easy derivation of protocols (abstract service realisations) ROS realisations: trivial because of correspondence between abstract procedures and RO macros) non-ros realisations: re-use of ASN.1, mapping between abstract operations and APDU exchange 9 11 OSI/ROS realisation of abstract service Object-oriented MHS model Port 1 object A Port N object B Message- origination MHS Reportreceipt Messagesubmission Reportdelivery application entity A application entity B ASE-1 ASE-N ASE-1 ASE-N ACSE ROSE ACSE ROSE OSI Presentation Service provider MHE Message transfer MHS Report transfer (nondelivery) Messagedelivery Messagereceipt MHS MHS 13 15

3 MHS abstract services (MS,, AU) submission delivery administration service indirect submission retrieval administration MS service () MS abstract service voor communicatie tussen - (, AU, MS) en () ports.operations bind, unbind submission Message-submission Probe-submission Cancel-deferred-delivery Submission-control: constraints delivery Message-delivery Report-delivery Delivery-control: - constraints administration Register: long-term - parameters Change-credentials: authentication info transfer message transfer service NB: argumenten van operaties ondersteunen een uitgebreide service control message types () message probe (delivery) report Voorbeeld abstract service definitie -- Objects mts OBJECT PORTS {submission [S], delivery [S], administration [S]} ::= id-ot-mts Ports submission PORT CONSUMER INVOKES {MessageSubmission, ProbeSubmission, CancelDeferredDelivery} SUPPLIER INVOKES {SubmissionControl} ::= id-pt-submission Submission port MessageSubmission ::= ABSTRACT-OPERATION ARGUMENT SEQUENCE { envelope MessageSubmissionEnvelope content Content} RESULT SET { message-submission-id MessageSubmissionIdentifier, message-submission-time MessageSubmissionTime, content-identifier ContentIdentifier OPTIONAL,...} ERRORS { SubmissionControlViolated, ElementOfServiceNotSubscribed, OriginatorInvalid, RecipientImproperlySpecified,...} SubmissionControlViolated ::= ABSTRACT-ERROR PARAMETER NULL... Message Store service abstract service voor communicatie tussen MS en MS ports bind, unbind indirect submission, retrieval, administration indirect submission operations versturen van message of probe door via MS (geen opslag) retrieval operations selectie van ontvangen/opgeslagen messages en reports manipulatie van opgeslagen messages en reports beschikbaar stellen van geselecteerde messages en reports door MS aan registratie van akties die door de MS uitgevoerd moeten worden zonder tussenkomst van de : auto-forwarding, genereren van ontvangstbevestigingen, weggooien van gedateerde messages 21 23

4 bestaat uit geografisch verspreide s Message Transfer Service uitwisseling van messages, probes en reports tussen s store-and-forwarding logica : dwz. incl. internal abstract procedures splitting joining name resolution distribution list expansion redirection conversion non-delivery non-affirmation affirmation routing geselecteerde procedures afhankelijk van: message "type": message, probe, report message ontvanger: lokaal, op afstand, fout abstract service voor communicatie tussen s ports: transfer, bind, unbind transfer operations: uitwisseling van messages, probes en reports tussen s message transfer parameters routing redirection conversion delivery time disclose recipients delivery report request content security report transfer parameters routing subject-message delivery/deliverability probe transfer parameters routing* redirection conversion delivery report request* content length MHS protocollen MHS protocollen thin OSI view PDUs en protocol procedures afgeleid met ROS package MSSE MDSE MASE MSSE MDSE MASE elk protocol omvat een familie van application contexts en wordt beschreven in termen van Application Service Elements : -access protocol ACSE ROSE RTSE ACSE presentation connection -access protocol ROSE RTSE Message Submission Service Element Message Delivery Service Element Message Administration Service Element ROSE, RTSE (optional), ACSE ACSE MSSE ROSE MRSE RTSE MASE P7 ACSE MSSE ROSE MRSE RTSE MASE P7: MS-access protocol Message Submission Service Element Message Retrieval Service Element Message Administration Service Element ROSE, RTSE (optional), ACSE P1: -transfer protocol Message Transfer Service Element ( 84/ 88) RTSE, ACSE applicatie context bepaalt versie en opties ACSE E presentation connection MS-access protocol P1 RTSE ACSE presentation connection -transfer protocol E RTSE 29 31

5 Interpersonal Messaging System (IPMS) systeem voor uitwisselen van berichten tussen personen content type: P2 ( 84) / P22 ( 88) abstract service voor communicatie tussen IPMS en IPMS (IPM-) ports: origination, reception, management message types interpersonal message (IPM) interpersonal notification (IPN) receipt notification non-receipt notification IPM heading parameters message origin recipients / recipient actions related IPMs timing subject treatment IPM body parts IA5 text external: externe codering geïdentificeerd door ASN.1 object identifier message: ingepakte IPM + envelope encrypted: vercijferde standaard body part IPN(otification) parameters non-receipt receipt IPM message (P22 content type) Office memo To: Eddie From: Marten Cc: Ing Subject: Meeting We will have our next course notes review meeting on Friday. Please examine the figure attached which shows the proposed functional model of IPMS. Regards Attachment IPM message Heading Body Body Part Body Part MHS - Electronic data interchange EDI Messaging System (EDIMS) systeem voor het uitwisselen van berichten (offerte, bestelling, factuur,...) tussen zakelijke partners content type: Pedi heading met EDI specifieke parameters body part met EDI interchange optioneel andere body parts onstaan uit P0 (VS) en specifieke toepassing van P2 (Eu) abstract service voor communicatie tussen EDIMS (EDI applicatie) en EDIMS (EDI-) ports: origination, reception, management message types EDI message (EDIM) EDI notification (EDIN) positive notification negative notification forwarded notification 37 39

6 EDIM heading parameters EDI message (Pedi content type) message origin recipients / recipient actions related EDIMs timing message type: offerte, bestelling,... treatment EDIFACT interchange UNA EDI message Field 1 EDIM body parts primary body part: EDI interchange EDIFACT, ANSI X12, UNTDI, private secondary body parts UNB UNH Data Segments UNT Field 2 Field 3 Field n Heading EDIN parameters positive negative forwarded UNZ Additional Information (e.g. drawings) Primary Body Part Body Part n Body ISP standaard: SMTP 1982: Simple Mail Transfer Protocol (SMTP) protocol / RFC 821 communicatie tussen twee mail transfer agents (s) over een TCP verbinding berichtformaat / RFC 822 formaat van een bericht (content + envelope) dat volgens het protocol / RFC 821 wordt uitgewisseld tussen twee s 1993 uitbreidingen nieuwe SMTP commando s extended SMTP (ESMTP) / RFC 1425 header met niet-ascii karakters RFC 1522 structuur van body Multipurpose Internet Mail Extensions (MIME) / RFC 1521 Concepten SMTP model agent mail queue mailbox message transfer agent () distributie communicatie tussen s server-client mail queue relay structuur van message message = envelope + content content = header + body parts genereert deel van header 45 47

7 SMTP functional model SMTP message structure content organisation host heading body agent system agent envelope message transfer system relay relay across the Internet EMS body heading body envelope content SMTP commands communicatie tussen s commands verstuurd door client minimale implementatie heeft 5 commands server antwoord met replies numerieke codes en optionele ASCII strings HELO (domain name van client host): 250 identificatie van client MAIL (naam van zender): 250 identificatie van zender RCPT (naam van ontvanger): 250 identificatie ontvanger DATA: 354 aankondiging van mail content transmissie QUIT: 221 beëindiging sessie RSET: 250 afbreken sessie + reset VRFY (naam van ontvanger): 250 <mailbox> verifiëren van ontvangeradres NOOP: 200 vragen om OK respons van server SMTP procedures opzetten van TCP verbinding server host wordt geidentificeerd door Internet adres SMTP server wordt geidentificeerd door wellknown poortnummer: 25 HELO command/response MAIL command/response RCPT command/response DATA command/response message content transmissie regel-georiënteerd (max bytes) header lines blank line body lines end-of-transmission line 250 reply code QUIT command/response 53 55

8 envelope parameters From (in MAIL command) To (in RCPT command) header parameters Received (gegenereerd door ) Message-Id (gegenereerd door ) From Date Reply-To To Subject body NVT (Network Virtual Terminal) ASCII header en body verstuurd in message content transmissie SMTP client (alpha.edu) verbinding met (beta.edu, port 25) HELO alpha.edu MAIL RCPT DATA content SMTP mail transactie TCP/IP network SMTP server (beta.edu) 220 beta.edu QUIT SMTP uitbreidingen envelope: extended SMTP (ESMTP) nieuwe SMTP commando s gebruik van ESMTP aangegeven door EHLO commando (i.p.v. HELO) header: gebruik van niet-ascii karakters formaat: =?charset?encoding?encoded-text?= voorbeeld: From: =?ISO ?Q?Andr=E9_Picard?= wordt vertaald door de agent naar From: André Picard body: Multipurpose Internet Mail Extensions (MIME) extra header parameters om body te beschrijven Mime-Version Content-Type text, multipart, image, audio, video,... Content-Transfer-Encoding Content-ID Content-Description 61

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