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End-to-middle Security in SIP draft-ono-sipping-end2middle-security-04

End-to-middle Security in SIP draft-ono-sipping-end2middle-security-04. Kumiko Ono ono.kumiko@lab.ntt.co.jp. IETF62. Status. Mechanism I-D Has been implemented Service Providers will need this more, as S/MIME gets widely deployed.

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End-to-middle Security in SIP draft-ono-sipping-end2middle-security-04

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  1. End-to-middle Security in SIPdraft-ono-sipping-end2middle-security-04 Kumiko Ono ono.kumiko@lab.ntt.co.jp IETF62

  2. Status • Mechanism I-D • Has been implemented • Service Providers will need this more, as S/MIME gets widely deployed. • Currently only few S/MIME-supporting UAs are out there. Cert management in SIP (sipping-cert) will change this. • Requirements I-D • Going under IESG review

  3. Changes from -03 • Deleted the open issue about labeling a body destined for “middle” • A new SIP header “Proxy-Required-Body” • Changed a response code for requiring a signature • A new response “495 Signature required” • Changed how to protect a label and its constraint • -03: Signature for a body which includes a label within sipfrag was SHOULD. • -04: TLS is now SHOULD and the signature for sipfrag is MAY. • A proxy server trusted to provide SIP routing is generally trusted to process all SIP headers. Therefore, hop-by-hop security is reasonable for the protection. • Deleted the open Issue about removing a label by proxy before forwarding • It is allowed to remove a label depending on security policies of providers. • Updated reference

  4. Open Issue #1 How should the error message indicate the Content-Type which needs a signature to be attached for data integrity? e.g., a body, body parts in multipart/mixed Conclusion: • For data integrity, signature for a body part alone is not sufficient. We always need signature for a whole body. • However, should the signature be inside, outside, or both, when encrypted ?

  5. Open Issue #2 How should a proxy tell a UA to disclose a body while protecting data integrity? Option 1: A new error response for combined reasons. Option 2: An existing response with Warning header Option 3: Existing responses • Instructing a UA one task at time • Causes more messages than Option 1&2. My proposal: Option 2

  6. Next Step • Can you think of any other open issues? • I will update this draft right after this IETF meeting.

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