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What?

Static builds of libtpms v0.7.7 and swtpm v0.5.2 for Debian Bullseye.

Configuration details

  • libtpms: --prefix=/usr --enable-static --with-tpm2 --with-openssl
  • swtpm: --prefix=/usr --enable-static --with-seccomp

/usr prefix is neccessary so that everything works with the bundled AppArmor profile: /etc/apparmor.d/abstractions/libvirt-qemu.

Why?

apt install virt-manager does not provide a functioning TPM2 out of the box. This repository rectifies the issue.

How?

  1. Save yourself time and download pre-compiled binaries from the Releases section.
  2. make install both.
  3. Install the Python modules system-wide:
    • ./swtpm-0.5.2/src/swtpm_setup/
    • ./swtpm-0.5.2/samples/

If you stumble upon "permission denied" errors - enable log level 3 in /etc/libvirt/libvirtd.conf and trace where it fails.

Testing

On the host running pre-release version of the Bullseye:

  • Linux 5.10.26-1
  • virt-manager 3.2.0-3
  • libvirt0 7.0.0-3

Querying TPM from inside the VM:

$ tpm2_pcrread | head -12
sha1:
  0 : 0xBF2BA644D7415ED4A24C50B2A795BA58DCE9FA32
  1 : 0x4FCBBCA9EC6A78AD7510516E445A7E6BEE3B020D
  2 : 0xE68C21DC48C4EA61626A5D309CD3A3518F5D9EAA
  3 : 0xB2A83B0EBF2F8374299A5B2BDFC31EA955AD7236
  4 : 0x42E626C470E1E0DF350EDFB42268A270FB8E4AF7
  5 : 0xEC36E74A3ACF557CE8CAE2DE373731C6153A7F39
  6 : 0xB2A83B0EBF2F8374299A5B2BDFC31EA955AD7236
  7 : 0x518BD167271FBB64589C61E43D8C0165861431D8
  8 : 0xCEBC47EEB27FD591D7B1D18B03754194FAA56866
  9 : 0xE31C7D6093B9903E2EA04434AE6F28972ECB4D7B
  10: 0x0000000000000000000000000000000000000000

Notes

  • Double-check PCRs behaviour on your particular system.
  • You might want to bind PCR8 instead of PCR6 (have a read).
  • Therefore, clevis luks bind -d /dev/vda3 tpm2 '{"pcr_ids":"0,1,2,3,5,7,8,9"}'.
  • Don't even try to seal against >8 PCRs.