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Geoff Huston Telstra

Some Steps towards Improving the Resiliency of the Internet Routing System: The Role of a Registry Certificate Authority. Geoff Huston Telstra. Vulnerability. Internet hosts are the subject of constant malicious attack

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Geoff Huston Telstra

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  1. Some Steps towards Improving the Resiliency of the Internet Routing System:The Role of a Registry Certificate Authority Geoff Huston Telstra

  2. Vulnerability • Internet hosts are the subject of constant malicious attack • The DNS is the subject of continual attempts to subvert its correct operation • Widespread malicious attacks on the Internet’s routing system are only a matter of time… • Attacks on the operation of the routing protocols • Attacks on weaknesses in the administrative systems used to manage routing configurations

  3. Injecting Routes • Administrative system • Customer passes prefix information to provider • Provider performs registry-based check on the relationship between the customer and the requested prefix • Passes the prefix and the customer details to the router config system • Pass prefix details to route neighbours • Router configuration • Entry of static routes / route filter into config database • Periodic generation of router configs from database

  4. Administrative Weaknesses • Link between ISP’s records of customer and registry address records can be incomplete or inconsistent • ISPs want to do the right thing by the customer and by their own business • Rapid service response • Respond positively to route requests • Spend minimal administrative overhead in operating the system

  5. Potential Role of Key Certificates • Registry records include public key for each allocated prefix • Customer controls private key • Administrative requests to ISP signed with private key of the corresponding prefix • ISP uses registry public key to validate customer request • ISP passes signed request to neighbors who will receive the re-advertised route, signing the neighbor request with the ISP’s private key

  6. Commentary • Does not eliminate need for secure routing protocols • Allows ISPs to use a trusted third party (Registry) to validate route requests: • Quickly • With minimal manual processing overhead • Accurately (*) • Any customer who leaks a private key is beyond help! • Details and procedures need to be refined…

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