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Jan Schaumann
@jschauma
99CE 1DC7 770A C5A8 09A6
0DCD 66CE 4FE9 6F6B D3D7
Protecting Data in Untrusted Locations
An exercise in “Real World” threat modeling.
Me. Errday.
https://t.co/Ej94YI4Ovr
Threat Model
Obligatory
James Mickens
“ThisWorld of Ours”
reference.
https://t.co/Ej94YI4Ovr
Threat Model
Obligatory
James Mickens
“ThisWorld of Ours”
reference.
gonna tweet
Tweeters
https://t.co/ykdsHGV84r
https://t.co/ykdsHGV84r
https://t.co/ykdsHGV84r
Threat Actors:
• hackeris vulgaris
• organized crime (fsvo “organized”)
• local governments or intelligence services
• foreign governments or intelligence
services
Threat Model
Threat Model
Assets:
• Physical Equipment
• Local Service Access Point
• Access/Entry point to Infrastructure
• TLS keys
Access/Entry point to
Infrastructure
• physically protected systems
• no “secrets” permanently stored on
systems
• traffic severely restricted
• all traffic must be mutually authenticated
https://www.xkcd.com/538/
Obligatory XKCD comic.
This also works.
TLS keys
Y U NO HSM?
TLS keys
No time to explain - get in the llama!
Booting
First time:
• boot into single-user mode
• generate TPM-backed CSR
• submit CSR to service in datacenter
• cert generated, used to encrypt client puppet key
• encrypted puppet key stored in host image
Nth time:
• iPXE via TLS
• init script decrypts puppet key using TPM
• puppet does its thing
http://cm.bell-labs.com/who/ken/trust.html
Obligatory
“Reflections onTrustingTrust”
reference.
Wile E. Coyote has an MBA.
Value of Asset
Cost of Attack
Wile’s ROI
Wile E. Coyote has an MBA.
Value of Asset
Cost of Attack
Wile’s ROI
Raising the cost of attack
Wile E. Coyote needs:
• physical access
• ability to attack running system
• persistent undetected presence
Wile E. Coyote has an MBA.
Value of Asset
Cost of Attack
Wile’s ROI
Wile E. Coyote has an MBA.
Value of Asset
Cost of Attack
Wile’s ROI
Reducing the value of TLS keys
• Forward Secrecy
• tightly scoped certificates
• short-lived
• alert if observed outside of expected env
Possible scenarios
• hardware compromised prior to us
racking it
• resources compromised through
temporary physical access (ACME
backdoor)
• ACME fake hole,ACME rocket
powered roller skates,ACME do-it-
yourself tornado kit,ACME
earthquake pills, ...
Lessons:
You can’t just rub some crypto on it.
http://youtu.be/YsY2-yi5W74
Lessons:
Know your assets, know your adversaries.
Jan Schaumann
@jschauma
54FE 193F 64ED DD0B CFDE
40D6 1983 626F 1E52 3D3A
Thanks!
(now get in the llama!)

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Protecting Data in Untrusted Locations