Network Time Security
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1 Network Time Security draft-ietf-ntp-network-time-security-08 draft-ietf-ntp-cms-for-nts-message-02 draft-ietf-ntp-using-nts-for-ntp-00 Dr. Dieter Sibold Kristof Teichel Stephen Röttger IETF 92 (Dallas), March 22-27, 2015
2 Outline History Scope Progress/Major Changes New Structure NTS Document CMS-for-NTS Document NTS-for-NTP Document Non IETF activities IEEE P1588 WG Authenticated NTP Project (ANTP) Next steps IETF 92 (Dallas), March 22-27, /17
3 History IETF 83: Presentation of security issues of RFC 5906 (autokey) IETF 84: Presentation of plan for a new autokey standard IETF 85 86: I-D draft-sibold-autokey-nn IETF 87 90: I-D draft-ietf-ntp-network-time-security-nn IETF 91: Continuation as draft-ietf-ntp-network-time-security-05 and addition of document draft-ietf-ntp-cms-for-nts-message-00 Submission January 2015: (January 16) draft-ietf-ntp-network-time-security-06 (January 22) draft-ietf-ntp-cms-for-nts-message-01 Submission March 2015: (March 03) draft-ietf-ntp-network-time-security-07 (March 05) draft-ietf-ntp-network-time-security-08 (March 06) draft-ietf-ntp-cms-for-nts-message-02 (March 06) draft-ietf-ntp-using-nts-for-ntp-00 IETF 92 (Dallas), March 22-27, /17
4 Scope Network Time Security shall provide: Authenticity of time servers Integrity of synchronization data packets Conformity with TICTOC s Security Requirements (RFC 7384) Support of NTP and PTP IETF 92 (Dallas), March 22-27, /17
5 Progress/Major Changes Contract signed with NTF, implementation underway Protocol Messages: Added a nonce to association exchange and extended signature in response message over request data Feedback: Tal Mizrahi Authors of Authenticated NTP article Document Structure: Overhaul of main document to be more generic (less NTP specific) Overhaul of draft-ietf-cms-for-nts-message to also be more generic Addition of document draft-ietf-ntp-using-nts-on-ntp (Holds the NTP specific content lost in the other documents) IETF 92 (Dallas), March 22-27, /17
6 New Structure: Overview IETF 92 (Dallas), March 22-27, /17
7 Main document now contains New Structure: Main Document Objectives (protocol-independent) NTS overview (protocol-independent) List of message exchanges, each with: Goals of this specific message exchange (isolated) All necessary message types Exchange procedure overview with diagram Considerations on server seed, hash algorithms and MAC generation (all generic; no specific data like bit lengths) Protocol-independent security considerations (added privacy discussion) Table of requirements (RFC 7384) Description of how NTS employs TESLA (generic with respect to bit lengths, choice of one-way function etc.) Overview of message dependencies and required pre-shared keys IETF 92 (Dallas), March 22-27, /17
8 New Structure: CMS-4-NTS CMS-4-NTS document now contains: CMS conventions Definition of archetypes Use of pre-defined CMS content types ASN.1 structures for different message types (each has a comment on what additional information is needed for the message type) IETF 92 (Dallas), March 22-27, /17
9 New Structure: NTS-4-NTP NTS-4-NTP document contains: Objectives for NTS-secured NTP Overview of NTS-secured NTP (unicast and broadcast mode) Protocol Sequence Split into client and server behaviour description, each split into unicast and broadcast sequence Sequence and order as appropriate for NTP Behaviour description overlaps with main document Implementation notes: extends description from CMS-for-NTS document and gives specifics NTP-specific security considerations (e.g. NTP pools) Flow diagrams for NTP specific client behaviour IETF 92 (Dallas), March 22-27, /17
10 IEEE P1588 working group: NTS-4-PTP First draft of NTS-4-PTP document contains: Protocol sequence as appropriate for PTP in mixed communication mode Description of NTS message structures in the context of PTP IETF 92 (Dallas), March 22-27, /17
11 Report: ANTP Project (1) ANTP Contributors: Queensland University of Technology: Benjamin Dowling, Douglas Stebila Microsoft Research: Greg Zaverucha Goals for ANTP: Authentication of single NTP server to SNTP client Integrity protection No server-side state for each client Low amount of public-key operations on server side IETF 92 (Dallas), March 22-27, /17
12 Report: ANTP Project (2) Main Differences between ANTP and NTS approaches: Differences in Scope: ANTP has no use of client certificates no client authorization ANTP does not secure NTP broadcast Differences in Methods: ANTP encrypts server state; transmits it to appropriate client NTS recalculates server state upon a time request ANTP contains additional zero cryptographic delay mode (sends cryptographic confirmations in a subsequent message) IETF 92 (Dallas), March 22-27, /17
13 Next steps Version 09 Future versions Consideration of DANE IANA Considerations Review and comments are requested from: TICTOC Working Group NTP Working Group NTP development team IETF 92 (Dallas), March 22-27, /17
14 APPENDIX: Detailed Diff (1) Overhaul of main document to be more generic (less NTP specific) Removed differentiation of unicast and broadcast mode Removed NTP inspired protocol sequence Replaced protocol sequence by message dependency diagram Removed specific data like bit length of nonces and keys Removed protocol specific discussion like usage of NTP pools Overhaul of draft-ietf-cms-for-nts-message to also be more generic Removed description of building messages via NTP packets IETF 92 (Dallas), March 22-27, /17
15 APPENDIX: Detailed Diff (2) Clean-up of generic main document: Reworked Introduction Reworked Objectives section Generalized formulation of method for achieving initial time synchronization for TESLA Reworked message dependecy diagram Refreshed requirements table (RFC 7384) For each message exchange, added: description of purpose procedure overview Security Considerations: Added paragraph on privacy Shortened paragraph on certificate validation Moved paragraph on random number generation here (from appendix) IETF 92 (Dallas), March 22-27, /17
16 APPENDIX: Detailed Diff (3) Feedback: Feedback from Tal Overhaul of terminology section (common terminology NTP/PTP) Clarified the use of client certificates and public keys Added message exchange flow diagrams Added table for required pre-shared keys during communication Appropriately marked appendices as normative/informative Feedback from ANTP group Clarified authorization Association exchange: added nonce, also included request data in the signature Corresponding changes in CMS document: Edited structure of association message objects IETF 92 (Dallas), March 22-27, /17
17 APPENDIX: Detailed Diff (4) Last-minute corrections in main document: Minor syntax corrections Inserted paragraph on different key pairs for encrypting and signing Inserted missing objective as well as necessary client checks for association exchange IETF 92 (Dallas), March 22-27, /17
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