Re: tpm_tis TPM2.0 not detected on cold boot

[Michael Niewöhner]

On Fri, 2019-01-04 at 12:58 +0100, Michael NiewÃhner wrote:
> On Thu, 2019-01-03 at 16:47 +0100, Michael NiewÃhner wrote:
> > On Thu, 2019-01-03 at 17:04 +0200, Jarkko Sakkinen wrote:
> > > On Thu, Jan 03, 2019 at 02:38:11PM +0100, Michael NiewÃhner wrote:
> > > > On Thu, 2019-01-03 at 15:27 +0200, Jarkko Sakkinen wrote:
> > > > > On Sun, Dec 23, 2018 at 12:55:12PM +0100, Michael NiewÃhner wrote:
> > > > > > There is another issue but I don't know if both are related. Maybe
> > > > > > that's
> > > > > > just a
> > > > > > timing issue...
> > > > > > 
> > > > > > root@debian:~# dd if=/dev/hwrng bs=1 count=1
> > > > > > dd: error reading '/dev/hwrng': Operation not permitted
> > > > > > 0+0 records in
> > > > > > 0+0 records out
> > > > > > 0 bytes copied, 0.755958 s, 0.0 kB/s
> > > > > > root@debian:~# dd if=/dev/hwrng bs=1 count=1 | xxd; dd if=/dev/hwrng
> > > > > > bs=1
> > > > > > count=1 | xxd
> > > > > > dd: error reading '/dev/hwrng': Operation not permitted
> > > > > > 0+0 records in
> > > > > > 0+0 records out
> > > > > > 0 bytes copied, 0.755697 s, 0.0 kB/s
> > > > > > 1+0 records in
> > > > > > 1+0 records out
> > > > > > 00000000: 52                                       R
> > > > > > 1 byte copied, 0.0106268 s, 0.1 kB/s
> > > > > > 
> > > > > > 
> > > > > > Michael
> > > > > 
> > > > > What does /sys/devices/virtual/misc/hw_random/rng_current show?
> > > > > 
> > > > > Did run commands as a sanity check on my laptop and seem to work.
> > > > > 
> > > > > /Jarkko
> > > > 
> > > > rng_current says "tpm-rng-0", which should be correct
> > > 
> > > Is /dev/tpm0 accessible and usable?
> > > 
> > > /Jarkko
> > 
> > No, it does not seem to work:
> > 
> > root@debian:~# tpm_version                                     
> > Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17),
> > Communication failure
> > root@debian:~# tcsd -f
> > TCSD TDDL ioctl: (25) Inappropriate ioctl for device
> > TCSD TDDL Falling back to Read/Write device support.
> > TCSD TDDL ERROR: write to device /dev/tpm0 failed: Operation not permitted
> > TCSD TCS ERROR: TCS GetCapability failed with result = 0x1087
> > root@debian:~# stat /dev/tpm0
> >   File: /dev/tpm0
> >   Size: 0         	Blocks: 0          IO Block: 4096   character special
> > file
> > Device: 6h/6d	Inode: 1114        Links: 1     Device type: a,e0
> > Access: (0600/crw-------)  Uid: (  104/     tss)   Gid: (  112/     tss)
> > Access: 2019-01-03 16:39:20.627635333 +0100
> > Modify: 2019-01-03 16:39:20.627635333 +0100
> > Change: 2019-01-03 16:39:20.627635333 +0100
> >  Birth: -
> > 
> > Michael
> 
> I have done some more tests with tpm2-tests from 
> https://github.com/jethrogb/tpm2-utils.
> These are my results:
> 
> 
> (initramfs) ./tpm2-test /dev/tpm0 vendor_tpm_type
> Error on write(fd,(char*)&tpm_cmd,sizeof(tpm_cmd)): Operation not permitted
> 
> (initramfs) ./tpm2-test /dev/tpm0 vendor_tpm_type; ./tpm2-test /dev/tpm0
> vendor_
> tpm_type
> Error on write(fd,(char*)&tpm_cmd,sizeof(tpm_cmd)): Operation not permitted
> ï   
> nitramfs) 
> 
> -> Same symptom like with dd if=/dev/tpm....
> 
> 
> Trying to read the firmware version:
> 
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> firmwa
> re_version_1;) 2>/dev/null | hexdump -C
> 00000000  80 01 00 00 00 1b 00 00  00 00 01 00 00 00 06 00  |................|
> 00000010  00 00 01 00 00 01 0b 00  01 00 03                 |...........|
> 0000001b
> 
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> firmwa
> re_version_2;) 2>/dev/null | hexdump -C
> 00000000  80 01 00 00 00 1b 00 00  00 00 01 00 00 00 06 00  |................|
> 00000010  00 00 01 00 00 01 0c 00  02 00 08                 |...........|
> 0000001b
> 
> -> This version numbers are correct, 1.3.2.8 indeed is the current flashed
> firmware.
> 
> 
> Get the vendor strings:
> 
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> vendor
> _string_1;) 2>/dev/null | xxd
> 00000000: 8001 0000 001b 0000 0000 0100 0000 0600  ................
> 00000010: 0000 0100 0001 0672 6c73 00              .......rls.
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> vendor
> _string_2;) 2>/dev/null | xxd
> 00000000: 8001 0000 001b 0000 0000 0100 0000 0600  ................
> 00000010: 0000 0100 0001 074e 5043 54              .......NPCT
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> vendor
> _string_3;) 2>/dev/null | xxd
> 00000000: 8001 0000 001b 0000 0000 0100 0000 0600  ................
> 00000010: 0000 0100 0001 0820 0000 00              ....... ...
> (initramfs) (./tpm2-test /dev/tpm0 vendor_string_1; ./tpm2-test /dev/tpm0
> vendor
> _string_4;) 2>/dev/null | xxd
> 00000000: 8001 0000 001b 0000 0000 0100 0000 0600  ................
> 00000010: 0000 0100 0001 0920 0000 00              ....... ...
> 
> Well, NPCT is correct...
> 
> 
> 
> Michael

Oh damn. I wasn not aware that trousers/tcsd does only support TPM<=1.2.
Instead of trousers I now tested tpm2-tools and tss2.
Guess what? Same symptoms... This is definitely some sort of timing issue...


root@debian:~# tpm2_nvlist 
ERROR:tcti:src/util/io.c:102:write_all() failed to write to fd 3: Operation not
permitted 
ERROR:tcti:src/tss2-tcti/tcti-device.c:86:tcti_device_transmit() wrong number of
bytes written. Expected 22, wrote 0. 
ERROR: GetCapability:Get NV Index list Error. TPM Error:0xa000a
ERROR: Unable to run tpm2_nvlist
root@debian:~# tpm2_nvlist; tpm2_nvlist
ERROR:tcti:src/util/io.c:102:write_all() failed to write to fd 3: Operation not
permitted 
ERROR:tcti:src/tss2-tcti/tcti-device.c:86:tcti_device_transmit() wrong number of
bytes written. Expected 22, wrote 0. 
ERROR: GetCapability:Get NV Index list Error. TPM Error:0xa000a
ERROR: Unable to run tpm2_nvlist
0x1800001:
  hash algorithm:
    friendly: sha256
    value: 0xB
  attributes:
    friendly:
authwrite|policydelete|writelocked|writedefine|authread|no_da|written|platformcr
eate
    value: 0x42C0462
  size: 70
........

root@debian:~# tpm2_pcrlist
ERROR:tcti:src/util/io.c:102:write_all() failed to write to fd 3: Operation not
permitted 
ERROR:tcti:src/tss2-tcti/tcti-device.c:86:tcti_device_transmit() wrong number of
bytes written. Expected 22, wrote 0. 
ERROR: GetCapability: Get PCR allocation status Error. TPM Error:0xa000a......
ERROR: Unable to run tpm2_pcrlist
root@debian:~# tpm2_pcrlist; tpm2_pcrlist 
sha1 :
  0  : 1ebb2be3b7103a09b5caeeb5827c1242cd6632ec
  1  : 425e833da73cb511150d6ffcf6fac64e9a6feb58
  2  : b2a83b0ebf2f8374299a5b2bdfc31ea955ad7236
  3  : b2a83b0ebf2f8374299a5b2bdfc31ea955ad7236
  4  : d13c141b174afbb568773adf1f39940a2df47c7d
  5  : 756a3647403ab141ec2c1ac7325854f4a93f6efd
......


Michael