8/02/2005IETF-63 MSEC IPsec extensions page 1 Brian Weis, Cisco Systems George Gross, IdentAware ™ Security Dragan Ignjatic, Polycom IETF-63, Paris, France,

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Presentation transcript:

8/02/2005IETF-63 MSEC IPsec extensions page 1 Brian Weis, Cisco Systems George Gross, IdentAware ™ Security Dragan Ignjatic, Polycom IETF-63, Paris, France, August 2nd 2005 The MSEC Extensions to IP Security

8/02/2005IETF-63 MSEC IPsec extensions page 2 RFC2401-bis IP Security Profile RFC2401-bis: ASM and SSM multicast SA, ESP, tunnel mode, IKE-v2 crypto-suite Concurrent co-existence with IKE-v2, requires SPD/SAD policy coordination SPD/SAD configurable by GO to three dominant multicast service models Require multiple speakers with anti-replay

8/02/2005IETF-63 MSEC IPsec extensions page 3 Examples of IPsec Policy Objects Policy filters, a match triggers an action(s) –5-tuple traffic selector filter –compound filter: prioritized filters sequence Policy actions –discard/log packet or allow packet to proceed –apply IPsec Group SA processing –multicast packet distributor –compound action: actions sequenced in a list

8/02/2005IETF-63 MSEC IPsec extensions page 4 Security Associations Modes Transport Tunnel – must be supported by a GW, optional for a host implementation

8/02/2005IETF-63 MSEC IPsec extensions page 5 Routing Address preservation –Destination address should have SPD-S PFP flag set –Some SSM implementations may need source address SPD-S PFP flag set as well –A new flag is introduced to copy remote address to the tunnel header remote address

8/02/2005IETF-63 MSEC IPsec extensions page 6 SPD Directionality attribute –Common (as in 2401bis) –Send only –Receive only Both send / receive only should support multicast destination addresses Discard & bypass policies applied to the send only should only create entries in SPD-O Likewise, applied to receive only should only create entries in SPD-I

8/02/2005IETF-63 MSEC IPsec extensions page 7 Traffic Processing Inbound traffic – SA’s point to their parent SPD entries Outbound traffic – any multicast destined traffic should be matched against SPD send only entries

8/02/2005IETF-63 MSEC IPsec extensions page 8 SAD Replay protection is needed for multi sender SA’s - TBD

8/02/2005IETF-63 MSEC IPsec extensions page 9 PAD Needs to be extended for peers with specific roles: –GCKS –Group Speaker –Group Member –Root Certs used by the group

8/02/2005IETF-63 MSEC IPsec extensions page 10 NAT’s SSM adversely impacted by it –GCKS can not be preconfigured with NAT mappings –SSM routing depends on the source address that NAT changes –ESP cloaks its payloads from NAT gw –UDP checksum depends on source address –AH can not be used