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MSRP Again!

MSRP Again!. draft-ietf-simple-message-session-09. Updates. Security Review Lots of editorial feedback Clarifications on REPORT handling. Quick Stuff First. Lots of ABNF scrubbing. Consolidated URL ABNF into general syntax section. Clarify that max-size sdp attribute is in octets.

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MSRP Again!

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  1. MSRP Again! draft-ietf-simple-message-session-09

  2. Updates • Security Review • Lots of editorial feedback • Clarifications on REPORT handling

  3. Quick Stuff First • Lots of ABNF scrubbing. • Consolidated URL ABNF into general syntax section. • Clarify that max-size sdp attribute is in octets.

  4. Pretty Quick Stuff • Added 501 response code for unknown methods. • Clarify the userinfo field is “unreserved”--additional restriction over RFC2396 • Change URL reference to rfc2396bis draft • Recommended SIP 488 response if no common MIME types.

  5. Security Review Changes

  6. Applicability Statement • MUST ONLY be used with a rendezvous protocol that: • Negotiates MSRP URLs • Handles AoRs with “im:” URIs. • Can do all this securely. • SIP can be used, others possible if they meet the criteria.

  7. URI Mapping • We need more clarity around how to use “im:” URLs with SIP. • Assumption that the mapping can only be done by something in the target domain. • Not specific to MSRP. RFC3428 has same issue. • Need a referenceable SIMPLE document on how this works in general.

  8. Draft Separation • Security Review pointed out that relays are needed for a full security story. Suggested re-integrating the two drafts. • Proposal: Leave them separate. We separated them for historical reasons, and re-integrating them now is not efficient use of effort.

  9. RFC3862 Application Considerations • RFC3862 requires all applications to describe usage of message/cpim headers. • MSRP devices MUST recognize From, To, Datetime, and Require. • SHOULD recognize CC • MAY recognize Subject. • Must include From and To. If using s/mime, then also DateTime. • NS, To, and CC may repeat. All others must not occur more than once.

  10. Other Issues

  11. MSRP URI parameters • Rohan proposed allowing “?” parameter syntax. • Needed to allow the relay extension where a client gets a URL range from a single AUTH • Intended to be in this release, but we missed it somehow. • Proposal: Put it in.

  12. Overlapping Chunks • What if you receive chunks with overlapping ranges? • Proposal: RECOMMEND that last chunk wins, unless the application constraints force other approaches.

  13. Report handling • Current revision not quite there. • Currently say that negative reports are sent per chunk, positive can be either per-message or incremental.

  14. Report Handling • Proposal: • Negative reports still per-chunk • New “incremental” value for Report-Success • If “yes”, the send positive reports for whole messages. • If incremental, send periodic positive reports indicating the range received so far.

  15. Report Handling • Reliable delivery requires Report-Success = yes or incremental. • Report-Failure allows rapid failure detection. • If a failure occurs, and the sender wishes to recover, it renegotiates the session URLs, and resends any content that has not been acknowledged in a positive report.

  16. Report Handling • Spurious report handling • Silently drop reports that do not match a previously sent message-id and range.

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