Reducing trust domain with txt
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Reducing Trust Domain with TXT. Daniel De Graaf. TXT overview. Original TPM – Static Root of Trust BIOS, all boot ROMs, bootloader, hypervisor, OS TPM 1.2 – dynamic root of trust Hypervisor startup (Xen) Normal OS startup (Linux). Application Trust. Standard system Kernel and hypervisor

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Reducing Trust Domain with TXT

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Reducing trust domain with txt

Reducing Trust Domain with TXT

Daniel De Graaf


Txt overview

TXT overview

  • Original TPM – Static Root of Trust

    • BIOS, all boot ROMs, bootloader, hypervisor, OS

  • TPM 1.2 – dynamic root of trust

    • Hypervisor startup (Xen)

    • Normal OS startup (Linux)


Application trust

Application Trust

  • Standard system

    • Kernel and hypervisor

    • All root processes (those with debug capabilities)

    • All processes with same UID

  • Reduced system

    • Kernel

    • TSS daemon (verifies application)


Trusted process launch

Trusted Process Launch

  • Notify TSS daemon (attach request)

  • Execute trusted application

  • TSS inspects memory map

  • Continue launch

    • Shared libraries must be checked by application

    • Stack (argv/environ) and heap are not checked


Attestation information

Attestation Information

  • Virtual memory mappings

    • Program “text” and BSS (data)

    • Dynamic linker (if used)

  • TSS signature

    • Dedicated PCR for signatures (random value)

    • Performed by TSS upon application request


Test application

Test Application

  • SSL server with built-in public key

  • Signed client certificates

  • Server authentication provided by TPM

    • TPM Quote of: app hash, client cert hash, nonce

    • Secure if client cert is secure

  • Trusted Storage needed for normal SSL


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