Testing

Differences between revisions 18 and 19
⇤ ← Revision 18 as of 2021-06-10 18:59:27 →
Size: 8239
Editor: dbungert
Comment: Add details on usage of VMM to define a VM with a software TPM
← Revision 19 as of 2021-08-12 11:19:11 → ⇥
Size: 8263
Editor: krzk
Comment:
Deletions are marked like this. Additions are marked like this.
Line 13: Line 13:
$ git clone git@github.com:liuqun/tpm2-ibmswtpm.git $ git clone https://github.com/liuqun/tpm2-ibmswtpm.git
$ cd tpm2-ibmswtpm

Testing with vTPM

Start the vTPM simulator

One can use a virtual TPM (vTPM) to run testing without affecting a physical device and risking to brick a system with an invalid manipulation of the TPM2 device.

Get the simulator from git: 

$ sudo apt install git snapcraft
$ git clone https://github.com/liuqun/tpm2-ibmswtpm.git
$ cd tpm2-ibmswtpm
$ snapcraft
$ sudo snap install --dangerous tpm20softwaresimulator_*.snap

Then run tpm20softwaresimulator from the snap. 

$ tpm20softwaresimulator
TPM command server listening on port 2321
Platform server listening on port 2322

Start a resource manager using the simulator

Ubuntu 18.10 and later

$ sudo apt install tpm2-abrmd
$ sudo tpm2-abrmd --allow-root --tcti=mssim --logger=stdout
[...]

And you'll see Client accepted in the output for the tpm2 simulator, or some similar message.

Ubuntu 18.04 and earlier

$ sudo apt install tpm2-tools
$ sudo resourcemgr -sim
[...]

And you'll see Client accepted in the output for the tpm2 simulator, or some similar message. The resource manager itself will display various messages, including its own port for connection (2323 by default).

Set up the client environment

There are some environment variables that it's useful to set to avoid repeating arguments to the tpm2-tools commands. These environment variables also differ by release and whether you are using the resource manager or not.

Ubuntu 19.04 and later with resource manager

$ export TPM2TOOLS_TCTI_NAME=socket
$ export TPM2TOOLS_SOCKET_PORT=2325

Ubuntu 19.04 and later without resource manager

$ export TPM2TOOLS_TCTI_NAME=socket

Ubuntu 18.10 and earlier with resource manager

$ export TPM2TOOLS_SOCKET_PORT=2325

Ubuntu 18.10 and earlier with no resource manager

No environment settings are needed. By default tpm2-tools will talk to the virtual tpm on the default socket.

Use the simulator without a resource manager

A resource manager is required for arbitrating access to the TPM from multiple clients. However, for single-thread usage, a resource manager is not required and it may be simpler to do testing without one. This requires manually initializing the TPM state rather than relying on the resource manager to do it.

This step is not required when using a hardware tpm because the kernel's tpm driver implements its own resource manager.

Ubuntu 19.04 and later

$ tpm2_startup -c

Ubuntu 18.10 and earlier

$ tpm2_startup --clear

Running commands for testing

19.04 or later

$ tpm2_pcrlist -g sha256
sha256:
  0 : 0x0000000000000000000000000000000000000000000000000000000000000003
  1 : 0x0000000000000000000000000000000000000000000000000000000000000000
  2 : 0x0000000000000000000000000000000000000000000000000000000000000000
  3 : 0x0000000000000000000000000000000000000000000000000000000000000000
  4 : 0x0000000000000000000000000000000000000000000000000000000000000000
  5 : 0x0000000000000000000000000000000000000000000000000000000000000000
  6 : 0x0000000000000000000000000000000000000000000000000000000000000000
  7 : 0x0000000000000000000000000000000000000000000000000000000000000000
  8 : 0x0000000000000000000000000000000000000000000000000000000000000000
  9 : 0x0000000000000000000000000000000000000000000000000000000000000000
  10: 0x0000000000000000000000000000000000000000000000000000000000000000
  11: 0x0000000000000000000000000000000000000000000000000000000000000000
  12: 0x0000000000000000000000000000000000000000000000000000000000000000
  13: 0x0000000000000000000000000000000000000000000000000000000000000000
  14: 0x0000000000000000000000000000000000000000000000000000000000000000
  15: 0x0000000000000000000000000000000000000000000000000000000000000000
  16: 0x0000000000000000000000000000000000000000000000000000000000000000
  17: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  18: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  19: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  20: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  21: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  22: 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
  23: 0x0000000000000000000000000000000000000000000000000000000000000000

Ubuntu 18.10 and earlier

$ tpm2_listpcrs -g 0xB

Bank/Algorithm: TPM_ALG_SHA256(0x000b)
PCR_00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03
PCR_01: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_02: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_03: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_04: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_05: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_06: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_07: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_08: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_09: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_11: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_12: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_13: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_14: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_15: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_16: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
PCR_17: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_18: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_19: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_21: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_22: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
PCR_23: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

QEMU swtpm

Qemu supports adding a virtual tpm device to a VM.

Prerequisites: QEMU tpm relies upon external binaries swtpm and swtpm_setup

Packages for this are not yet in Debian/Ubuntu - see ITP: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=941199 Until those packages are available, obtain source from https://github.com/stefanberger/swtpm and build binary packages manually. Install these debs: swtpm swtpm-libs swtpm-tools

VM Setup in Virtual Machine Manager:

1. Create a new Virtual Machine with Connection Type QEMU/KVM

2. Configure the rest of the VM as desired but choose "Customize configuration before install"

3. One may want use UEFI firmware. On the overview tab, consider using the UEFI "secboot.fd" firmware. See OVMF for more details.

4. Add hardware -> TPM

TPM/Testing (last edited 2021-08-12 11:19:11 by krzk)