MSRP - Base

1
MSRP - Base Relay

• IETF 62 - Simple WG
• Ben Campbell
• Cullen Jennings

2
Changes to MSRP Base

• SDP Changes
• Followed strong advice of mmusic chairs
• Attempt to be more inline with conventional SDP
  usage
• Protocol field changed to msrp/tcp
• Address and port copied to c and m lines
• MSRP devices still get address and port from Path
  attribute--no real change.
• Reference changed to SDP-New

3
New Response Codes

• 408 -- Timeout
• 413 -- Stop sending message
• 423 -- Parameter out of bounds

4
Miscellaneous

• Report-Success, Report-Failure changed to
  Success-Report and Failure-Report to ease parsing
• Allow ", ", and "/ in session-id part of
  URI--makes it easier to embed base64 encoded
  state
• More security consideration language about TLS
  implications of running peer-to-peer vs. with
  relays
• Cleaned up IANA consideration section
• Various editorial fixes

5
Changes to MSRP RelayDigest Changed to Basic

• The AUTH commands return a shared secret in the
  form of the relay URI
• This cannot be revealed to attackers so the AUTH
  MUST be done over TLS
• Inside TLS, basic is as strong as digest and
  easier and faster as there is no challenge
• OK ?????

6
Other Changes to Relay

• Add Max-Expires
• Better explanation of multi relay AUTH
• Reorganization of document
• Made SDP, Response Codes, and URI consistent with
  base draft

7
Stateless Relay Implementation

• Appendix A has non normative text that explains
  one way that a relay can push most of its state
  to the client
• Should we delete this or leave it?