Software-Defined Networking (SDN)-based IPsec Flow Protection (draft-ietf-i2nsf-sdn-ipsec-flow-protection-00)
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1 Software-Defined Networking (SDN)-based IPsec Flow Protection (draft-ietf-i2nsf-sdn-ipsec-flow-protection-00) Presenter: Gabriel López-Millán Rafael Marín-López (University of Murcia)
2 SDN-based IPsec Architecture for the SDN-based IPsec mgmt to centralize the establishment and management of IPsec security associations To define (so far) the NSF facing interfaces required to manage and monitor the IPsec SAs in the NSF from a SC. Case 1) The NSF implements IKE, SPD, SAD and PAD SC provisioning the NSF with information to IKE, SPD and PAD Case 2) The NSF implements the IPsec databases (no IKE). The SC provides the NSF the required parameters to create valid entries in the SPD and SAD The NSF only support for IPsec, while automated key management functionality is moved to the SC
3 Update (Changes in ietf- -00) Improved 5.3. Case 1 vs Case 2 discussion Added text about NSF restart behavior It may lose part or all the IPsec state. By default, the SC can assume that all the state has been lost and therefore it will have to send: IKEv2, SPD and PAD information to the NSF in case 1 SPD and SAD information in case 2 Other more optimized options can be considered (e.g. making ikev2 configuration permanent between reboots)
4 Update (Changes in ietf- -00) Improved YANG configuration data model à comments received in the mailing-list ( Y/?qid=8c890a079867d021dd5265f00a047e33) - SAD model: - ah and esp descriptions aligned - Modified combined-enc-intr boolean for esp-sa element - Added espencap for encap element to allow ESPinTCP, ESPinTLS and ESPinUDP - Added sadb_bad-spi notification to inform the SC that packets with unknown SPI are received
5 Update (Changes in ietf- -00) Improved YANG configuration data models (cont.) - IKEv2 - Updated autostartup element to represent the states: alwayson, initiate-on-demand and respond-only - Added encap element, sport, sport and oaddr for nattraversal options - Added combined-enc-intr - List of pfs_group allowed - Removed phase1-authby à Already in PAD - Removed phase2 elements (lifetime, authalg, encalg), local and remote addresses à represented by the SPD model
6 Update (Changes in ietf- -00) Interim meeting minutes: i2nsf-01/materials/minutes-interim-2017-i2nsf / New section Security Considerations Shares the security issues in [ITU-T.Y.3300] and [RFC8192] Case 1 SC sends IKE creds (PSK, public/private keys, certificates, etc.) to NSFs Recommendation à SC NEVER stores the IKE creds after distributing NSFs MUST NOT allow the reading of these values once they have been applied by the SC (i.e. write only operations) Avoid impersonation in IKE If PSK, immediately after distributing it, the SC should remove it If raw public keys, the SC should remove the associate private key immediately after distributing them to the NSF If certificates, the NSF may generate the private key and exports the public key for certification in the SC
7 Update (Changes in ietf- -00) New section Security Considerations Case 2 That key material are symmetric keys to protect data traffic the SC NEVER stores the keys after distributing them the NSFs MUST NOT allow the reading of these values once they have been applied by the SC (i.e. write only operations) if attacker has access to the SC during the period of time that key material is generated, he may have access to the key material used in the distributed IPsec SAs
8 Next steps To continue the Configuration Data model revision To start the definition of the State Data model for case 1 and case 2
9 Software-Defined Networking (SDN)-based IPsec Flow Protection (draft-ietf-i2nsf-sdn-ipsec-flow-protection-00) Presenter: Gabriel López-Millán Rafael Marín-López (University of Murcia)
10 YANG Model Trees
11 Update - SPD model (tree)
12 Update - SAD model (tree)
13 Update - SAD model (tree)
14 Update - PAD model (tree)
15 Update - IKE model (tree)
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