R_A_RFC2408_5_1_GENERIC - [Responder Test] Invalid ISAKMP Payload Length
End-Node
R_A_RFC2408_5_1_GENERIC.seq [-tooloption ...] -pkt R_A_RFC2408_5_1_GENERIC.def -tooloption : v6eval tool option
See also ike_common.def and ike_ipsec.def and ike_addr.def and ike_pkt_ph1_recv.def and ike_pkt_ph2_recv.def
HOST-2(TN):initiator
|3ffe:501:ffff:101::11
|
Net-y --+--------+------------------------ 3ffe:501:ffff:101::/64
|
|
ROUTER-1(TN)
|3ffe:501:ffff:100::11
|
Net-z --+--------+------------------------ 3ffe:501:ffff:100::/64
|
|3ffe:501:ffff:100:XXXX
NUT:responder
XXXX: EUI64 address
Verification Points
If the ISAKMP message length and the value in
the Payload Length field of the ISAKMP Header are not the same, then
the ISAKMP message MUST be rejected. The receiving entity (initiator
or responder) MUST do the following:
1. The event, UNEQUAL PAYLOAD LENGTHS, MAY be logged in the
appropriate system audit file.
2. An Informational Exchange with a Notification payload containing
the UNEQUAL-PAYLOAD-LENGTHS message type MAY be sent to the
transmitting entity. This action is dictated by a system
security policy.
Configuration
ISAKMP Header Format(HOST-2:Initiator)
Length field = 0 (invalid value)
Initiator and Responder IKE parameter
At least, following parameter must be included in proposal.
| Machine |
Src |
Dest |
Phase I |
Phase II |
| Ex mode |
Key Value |
Enc Alg |
Hash Alg |
Auth Method |
DH Group |
PH1 Lt |
IDx |
Proto ID |
Trans ID |
Mode |
Auth Alg |
PH2 Lt |
Upper |
| NUT |
NUT addr |
HOST-2 addr |
Aggressive |
IKE-TEST |
3DES |
SHA |
pre-shared key |
2 |
8 Hour |
NUT addr |
PROTO_IPSEC_ESP |
ESP_3DES |
Transport |
HMAC-SHA |
8 Hour |
any |
| HOST-2 |
HOST-2 addr |
NUT addr |
Aggressive |
IKE-TEST |
3DES |
SHA |
pre-shared key |
2 |
8 Hour |
HOST-2 addr |
PROTO_IPSEC_ESP |
ESP_3DES |
Transport |
HMAC-SHA |
8 Hour |
any |
*Ex Mode = Exchange mode
*IDx = identity payload(FQDN or user FQDN can also be chosen as IDx)
*Enc Alg = IKE Encryption Algorithm
*Hash Alg = IKE Authentication Algorithm
*Key Value = pre-shared key value
*PH1 Lt = Phase-1 Lifetime
*PH2 Lt = Phase-2 Lifetime
*Proto ID = Protocol Identifier
*Trans ID = Transform Identifier
*Mode = Encapsulation Mode
*Auth Alg = Authentication Algorithm
*Auth Method = Authentication Method
*DH Group = Diffie-Hellman Group
*Upper = Upper Layer Protocol
*NUT addr = NUT address
*HOST-2 addr = HOST-2 address
This test check is following.
AGGRESSIVE EXCHANGE
# Initiator(TN) Direction Responder(NUT)
(1) HDR; SA, KE, Ni, IDii ========> <-----Length field(ISAKMP header) : 0(invalid)
(2-A) X <======== HDR; SA, KE, Nr, IDir, HASH_R <-----Must not transmit
or
(2-B) <======== HDR; N/D
Judgement (Check *1)
1. Send the first message from TN
In the first message (1), the initiator generates a proposal it
considers adequate to protect traffic for the given situation. The
Security Association, Proposal, and Transform payloads are included
in the Security Association payload (for notation purposes).
Keying material used to arrive at a common shared secret and random
information which is used to guarantee liveness and protect against
replay attacks are also transmitted. Additionally, the initiator
transmits identification information.
2. Receive the second message from NUT
In the second message (2-B), the responder indicates either an ISAKMP
Notify Payload or an ISAKMP delete Payload.
The first message must not be accepted.
And the second message(2-A) must not be returned
(* or UNEQUAL-PAYLOAD-LENGTHS message(2-B) is returned).
*option : if you want to check the retruned Notify message.
Clean up SAD and SPD
RFC2408
5.1 General Message Processing
Every ISAKMP message has basic processing applied to insure protocol
reliability, and to minimize threats, such as denial of service and
replay attacks. All processing SHOULD include packet length checks
to insure the packet received is at least as long as the length given
in the ISAKMP Header. If the ISAKMP message length and the value in
the Payload Length field of the ISAKMP Header are not the same, then
the ISAKMP message MUST be rejected. The receiving entity (initiator
or responder) MUST do the following:
1. The event, UNEQUAL PAYLOAD LENGTHS, MAY be logged in the
appropriate system audit file.
2. An Informational Exchange with a Notification payload containing
the UNEQUAL-PAYLOAD-LENGTHS message type MAY be sent to the
transmitting entity. This action is dictated by a system
security policy.
(omit)
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