Title

  Test IKEv2.EN.I.1.2.6.7: Rekeying a CHILD_SA while Closing a CHILD_SA
  Part A: (BASIC)

Purpose

  To verify an IKEv2 device properly handles simultaneous closing and rekeying a CHILD_SA.

References

  * [RFC 4718] - Sections 5.11.5

Test Setup

  * Network Topology
      Connect the devices according to the Common Topology.
  * Configuration
      In each part, configure the devices according to the Common Configuration.
      In addition, set IKE_SA Lifetime to 300 seconds and set CHILD_SA Lifetime to 30
      seconds.
  * Pre-Sequence and Cleanup Sequence
      IKEv2 on the NUT is disabled after each part.

Procedure

   NUT                  TN1
(End-Node)           (End-Node)
    |                    |
    |------------------->| IKE_SA_INIT request (HDR, SAi1, KEi, Ni)
    |                    | (Judgement #1)
    |<-------------------| IKE_SA_INIT Response (HDR, SAr1, KEr, Nr)
    |                    | (Packet #1)
    |                    |
    |------------------->| IKE_AUTH request (HDR, SK {IDi, AUTH, N+, SAi2, TSi, TSr})
    |                    | (Judgement #2)
    |<-------------------| IKE_AUTH Response (HDR, SK {IDr, AUTH, N+, SAr2, TSi, TSr})
    |                    | (Packet #2)
    |                    |
    |                    * wait until CHILD_SA expires
    |                    |
    |------------------->| INFORMATIONAL request (HDR, SK {D})
    |                    | (Judgement #3)
    |                    |
    |<-------------------| CREATE_CHILD_SA request (HDR, SK {N, N+, SA, Ni, TSi, TSr})
    |                    | (Packet #3)
    |                    |
    |<-------------------| INFORMATIONAL response (HDR, SK {D})
    |                    | (Packet #4)
    |                    |
    |------------------->| CREATE_CHILD_SA response (HDR, SK {N(NO_PROPOSAL_CHOSEN)})
    |                    | (Judgement #4)
    |                    |
    V                    V
 N: REKEY_SA
 N+: USE_TRANSPORT_MODE

Packet #1	See Common Packet #2
Packet #2	See Common Packet #4
Packet #3	See Common Packet #13
Packet #4	See below

* Packet #4: INFORMATIONAL request

IPv6 Header	Source Address	TN1's Global Address on Link X
	Destination Address	NUT's Global Address on Link A
UDP Header	Source Port	500
	Destination Port	500
IKEv2 Header	IKE_SA Initiator's SPI	any
	IKE_SA Responder's SPI	any
	Next Payload	46 (E)
	Major Version	2
	Minor Version	0
	Exchange Type	37 (INFORMATIONAL)
	X (bits 0-2 of Flags)	0
	I (bit 3 of Flags)	0
	V (bit 4 of Flags)	0
	R (bit 5 of Flags)	1
	X (bits 6-7 Flags)	0
	Message ID	The same value as corresponding request's Message ID
	Length	any
E Payload	Next Payload	42 (D)
	Critical	0
	Reserved	0
	Payload Length	any
	Initialization Vector	The same value as block length of the underlying encryption algorithm
	Encrypted IKE Payloads	Subsequent payloads encrypted by underlying encryption algorithm
	Padding	Any value which to be a multiple of the encryption block size
	Pad Length	The length of the Padding field
	Integrity Checksum Data	The Cryptographic checksum of the entire message
D Payload	Next Payload	0
	Critical	0
	Reserved	0
	Payload Length	12
	Protocol ID	3 (ESP)
	SPI Size	4
	# of SPIs	1
	Security Parameter Index	NUT's inbound CHILD_SA SPI value of the original CHILD_SA

  Part A: (BASIC)
     1. NUT starts to negotiate with TN1 by sending IKE_SA_INIT request.
     2. Observe the messages transmitted on Link A.
     3. TN1 responds with an IKE_SA_INIT response to the NUT.
     4. Observe the messages transmitted on Link A.
     5. After reception of IKE_AUTH request from the NUT, TN1 responds with an IKE_AUTH
         response to the NUT
     6. Observe the messages transmitted on Link A.
     7. TN1 transmits a CREATE_CHILD_SA request to rekey a CHILD_SA.
     8. TN1 responds with an INFORMATIONAL response to an INFORMATIONAL request to
         close a CHILD_SA.
     9. Observe the messages transmitted on Link A.

Observable Result

  Part A
     Step 2: Judgment #1
     The NUT transmits an IKE_SA_INIT request including "ENCR_3DES",
     "PRF_HMAC_SHA1", "AUTH_HMAC_SHA1_96" and "D-H group 2" as proposed
     algorithms.

     Step 4: Judgment #2
     The NUT transmits an IKE_AUTH request including "ENCR_3DES",
     "AUTH_HMAC_SHA1_96" and "No Extended Sequence Numbers" as proposed algorithms.

     Step 6: Judgment #3
     The NUT transmits an INFORMATONAL request to close a CHILD_SA.

     Step 9: Judgment #4
     The NUT responds with a CREATE_CHILD_SA response to a CREATE_CHILD_SA reqest
     to rekey a CHILD_SA. The CREATE_CHILD_SA response includes a Notify payload of
     type NO_PROPOSAL_CHOSEN.

Possible Problems

  * Each NUT has the different lifetime of SA.