RE: CPA and overrides

[Martin W Sachs <mwsachs@us.ibm.com>]

I am puzzled by the word "override".  In this traffic I am seeing two
different things:

1.  Override, meaning to bypass the CPA.  Use of the CPA is always optional
since all ebXML specifications are intended to be used together or
separately.  Using CPA or not depends on how your middleware was defined.
Overriding parts of the CPA irrespective of their cardinality would lead to
anarchy, as someone else said, and defeat the interoperability purpose of
the CPA.  Middleware that makes the CPA optional would still have to supply
the "CPA" fields in the message header since these are part of routing and
their function is needed with or without a CPA.

2.  The Override element in the CPA which is a way of substituting a
different delivery channel for specific messages than the one defined for
most messages.  This  element is "optional".

Regards,
Marty

*************************************************************************************

Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com
*************************************************************************************



Maryann Hondo/Austin/IBM@IBMUS on 02/23/2001 09:17:28 AM

To:   Dick Brooks <dick@8760.com>
cc:   rsalz@CaveoSystems.com, ebxml-transport@lists.ebxml.org,
      maw2@daimlerchrysler.com
Subject:  RE: CPA and overrides



Am I the only one who is concerned about this from a security view?
if we allow for "overrides" .....what is the model of who overrides what?
can i override the "to" part or the "from" part (particularly if i want to
muck up the works of my
competition a bit) can i "override" the https protocol with http? and what
about "intermediaries"?
are they allowed to "override" things?

how does as2 provide for this type of override? is this ok? is it up to the
receiving
app to determine if the transaction came over a secure channel?  whose
liability is it
if the sender sends data over an insecure link when a secure link was
agreed to and
some information is "stolen"? are these issues addressed in as2?

i could see defining a default which is used instead of a cpp/cpa or if
there is no cpa referenced,
but i would want to know how the security piece was agreed to by both
parties and how it is possible to
verify that the correct mechanism was used.

 Maryann


Dick Brooks <dick@8760.com> on 02/23/2001 08:44:19 AM

To:   rsalz@CaveoSystems.com, ebxml-transport@lists.ebxml.org,
      maw2@daimlerchrysler.com
cc:
Subject:  RE: CPA and overrides



I agree with Martha and Rich. Forcing a CPA/CPP module onto an MSH solution
is an unnecessary burden on those
needing simple, "direct" file transfer over a single transport, which is
the
majority of implementations
in the Energy industry. The EDIINT AS2 specification made provisions for
multiple transport options by adding
a "receipt-delivery-option" header.  This header contains a URI indicating
the transport and delivery point (e.g.
http://b2b.imacompany.com/cgi-bin/ebxmlhandler or
mailto:ebxmlhandler@imacompany.com ) to send an asynchronous receipt
(acknowledgement).

CPA/CPP functionality is a nice feature for some, but it shouldn't be a
requirement for ALL. If alternate delivery channels are needed for
*acknowledgements* then I suggest a solution like that found in AS2.

Dick Brooks
http://www.8760.com/


-----Original Message-----
From: rsalz@CaveoSystems.com [mailto:rsalz@CaveoSystems.com]
Sent: Friday, February 23, 2001 7:57 AM
To: ebxml-transport@lists.ebxml.org; maw2@daimlerchrysler.com
Subject: Re: CPA and overrides


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As I recall the discussion of "override" from the telecon's of a couple
of weeks ago, the concern was that an MSH not be able to change the
delivery semantics that were specified in the CPA.  For example, a
UDP-based MSH could not accept a message intended for ReliableMessaging,
but then silently use BestEffort.

*IF* we put all the delivery semantics into the ebXML message header,
then this question mostly goes away, because there is no CPA involved:
it becomes a quality of implementation issue for how the business app
tells its local MSH what semantics are required *by the business
agreements.*

Requiring an MSH to have to refer to a CPA is clearly a layering violation.

     /r$

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