SCHC Rule Access Control
draft-toutain-lpwan-access-control-00

lpwan Working Group                                          A. Minaburo
Internet-Draft                                                    Acklio
Intended status: Standards Track                              L. Toutain
Expires: 18 August 2023                                      I. Martinez
                                  Institut MINES TELECOM; IMT Atlantique
                                                        14 February 2023

                        SCHC Rule Access Control
                 draft-toutain-lpwan-access-control-00

Abstract

   The framework for SCHC defines an abstract view of the rules,
   formalized with through a YANG Data Model.  In its original
   description rules are static and share by 2 entities.  The use of
   YANG authorizes rules to be uploaded or modified in a SCHC instance
   and leads to some possible attacks, if the changes are not
   controlled.  This document summarizes some possible attacks and
   define augmentation to the existing Data Mode, to restrict the
   changes in the rule.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on 18 August 2023.

Copyright Notice

   Copyright (c) 2023 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights

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   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
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   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Attack scenario . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  YANG Access Control . . . . . . . . . . . . . . . . . . . . .   2
   4.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Appendix A.  Security Considerations  . . . . . . . . . . . . . .   3
   Appendix B.  IANA Considerations  . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

2.  Attack scenario

   A LWM2M device, under control of an attacker, sends some management
   messages to modify the SCHC rules in core in order to direct the
   traffic to another application.  This can be either to participate to
   a DDoS attack or to send sensible information to another application.

   SCHC rules are defined for a specific traffic.  An attacker changes
   en element (for instance, the dev UDP port number) and therefore no
   rule matches the traffic, the link may be saturated by no-compressed
   messages.

3.  YANG Access Control

   YANG language allows to specify read only or read write nodes.  NACM
   [RFC8341] extends this by allowing users or group od users to perform
   specific actions.

   This granularity do not fit this the rule model.  For instance, the
   goal is not to allow all the field-id leaves to be modified.  The
   objective is to allow a specific rule entry to be changed and
   therefore some of the leaves to be modified.  For instance an entry
   with field-id containing Uri-path may have his target-value modified,
   as in the same rule, the entry regarding the app-prefix should not be
   changed.

   The SCHC access control augments the YANG module defined in
   [I-D.ietf-lpwan-schc-yang-data-model] to allow a remote entity to
   manipulate the rules.  Several levels are defined.

   *  in the set of rules, it authorizes or not a new rule to be added .

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   *  in a compression rule, it allows to add or remove field
      descriptions.

   *  in a compression rule, it allows to modify some elements of the
      rule, such as the target-value, the matching-operator or/and the
      comp-decomp-action and associated values.

   *  in a fragmentation rule, it allows to modify some parameters.

4.  Normative References

   [I-D.ietf-lpwan-schc-yang-data-model]
              Minaburo, A. and L. Toutain, "Data Model for Static
              Context Header Compression (SCHC)", Work in Progress,
              Internet-Draft, draft-ietf-lpwan-schc-yang-data-model-21,
              9 October 2022, <https://datatracker.ietf.org/doc/html/
              draft-ietf-lpwan-schc-yang-data-model-21>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/rfc/rfc8341>.

   [RFC8824]  Minaburo, A., Toutain, L., and R. Andreasen, "Static
              Context Header Compression (SCHC) for the Constrained
              Application Protocol (CoAP)", RFC 8824,
              DOI 10.17487/RFC8824, June 2021,
              <https://www.rfc-editor.org/rfc/rfc8824>.

Appendix A.  Security Considerations

   TBD

Appendix B.  IANA Considerations

   TBD

Authors' Addresses

   Ana Minaburo
   Acklio
   1137A avenue des Champs Blancs
   35510 Cesson-Sevigne Cedex
   France
   Email: ana@ackl.io

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   Laurent Toutain
   Institut MINES TELECOM; IMT Atlantique
   2 rue de la Chataigneraie
   CS 17607
   35576 Cesson-Sevigne Cedex
   France
   Email: Laurent.Toutain@imt-atlantique.fr

   Ivan Martinez
   Institut MINES TELECOM; IMT Atlantique
   2 rue de la Chataigneraie
   CS 17607
   35576 Cesson-Sevigne Cedex
   France
   Email: ivan-marino.martinez-bolivar@imt-atlantique.fr

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