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1 year ago

Presented by Jason A Donenfeld FOSDEM 2017

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Cookies: TCP-like ▪

Cookies: TCP-like ▪ ▪ ▪ ▪ Dialog: ▪ Initiator: Compute this DH(). ▪ Responder: Your magic word is “waffle”. Ask me again with the magic word. ▪ Initiator: My magic word is “waffle”. Compute this DH(). Proves IP ownership, but cannot rate limit IP address without storing state. ▪ Violates security design principle, no dynamic allocations! Always responds to message. ▪ Violates security design principle, stealth! Magic word can be intercepted.

Cookies: DTLS-like and IKEv2-like ▪ ▪ ▪ ▪ ▪ ▪ Dialog: ▪ Initiator: Compute this DH(). ▪ Responder: Your magic word is “cbdd7c…bb71d9c0”. Ask me again with the magic word. ▪ Initiator: My magic word is “cbdd7c…bb71d9c0”. Compute this DH(). “cbdd7c…bb71d9c0” == MAC(key=responder_secret, initator_ip_address) Where responder_secret changes every few minutes. Proves IP ownership without storing state. Always responds to message. ▪ Violates security design principle, stealth! Magic word can be intercepted. Initiator can be DoS’d by flooding it with fake magic words.

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