Title

  Test IKEv2.EN.I.1.2.6.1: Simultaneous CHILD_SA Close
  Part A: (BASIC)

Purpose

  To verify an IKEv2 device properly handles simultaneous CREATE_CHILD_SA message to
  close CHILD_SA.

References

  * [RFC 4718] - Sections 5.11.1

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 expiring CHILD_SA
    |                    |
    |------------------->| INFORMATIONAL request (HDR, SK {D})
    |                    | (Judgement #3)
    |                    |
    |<-------------------| INFORMATIONAL request (HDR, SK {D})
    |                    | (Packet #3)
    |                    |
    |<-------------------| INFORMATIONAL response (HDR, SK {})
    |                    | (Packet #4)
    |                    |
    |------------------->| INFORMATIONAL response (HDR, SK {})
    |                    | (Judgement #4)
    |                    |
    |<-------------------| IPsec {Echo Request}
    |                    | (Packet #5)
    |                    |
    |---------X          | IPsec {Echo Reply}
    |                    | (Judgement #5)
    |                    |
    V                    V
 N: USE_TRANSPORT_MODE

Packet #1	See Common Packet #2
Packet #2	See Common Packet #4
Packet #3	See below
Packet #4	See Common Packet #17
Packet #5	See Common Packet #19

* Packet #3: 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)	any
	V (bit 4 of Flags)	0
	R (bit 5 of Flags)	0
	X (bits 6-7 Flags)	0
	Message ID	0
	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 to be deleted

  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. TN1 waits until expiring IKE_SA's lifetime and does not respond to an INFORMATIONAL
         request with an INFORMATIONAL response for liveness check.
     7. Observe the messages transmitted on Link A.
     8. TN1 transmits an INFORMATIONAL request to close CHILD_SA established at Step 5.
     9. TN1 responds with an INFROMATIONAL response with no payload to an
         INFORMATIONAL request received at Step 7.
     10. Observe the messages transmitted on Link A.
     11. TN1 transmits an Echo Request with IPsec ESP using corresponding algorithms to NUT.
     12. 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 7: Judgment #3
       The NUT transmits an INFORMATIONAL request with a Delete Payload including 3 (ESP)
       as Protocol ID, 4 as SPI Size and the inbound SPI value to be deleted as SPI.

       Step 10: Judgment #4
       The NUT responds with an INFORMATIONAL response with no payload to an
       INFORMATIONAL request to close CHILD_SA.

       Step 12: Judgment #5
       The NUT never transmits an Echo Reply with IPsec ESP using ENCR_3DES an
       AUTH_HMAC_SHA1_96.

Possible Problems

  * Each NUT has the different lifetime of SA.