Hi All!
I am trying to get TXT working. I was able to get it to run with
POLTYPE_ANY, however, as soon as I added a policy data file, I started
getting *TXT error 0xC00020C1*, which for my SINIT ACM means "*Invalid
RSDP*". (note that this error doesn't happen if I don't add the policy data
module in grub2).
Specific details about my setup:
* Intel NUC NUC5i5MYHE
* TPM 2.0
* PO NV Index: 0x1400001, with attributes 0x4000A:
- TPMA_NV_OWNERWRITE
- TPMA_NV_POLICYWRITE
- TPMA_NV_AUTHREAD
* "5th_gen_i5_i7_SINIT_79.BIN" SINIT ACM, downloaded from intel website. It
seems to be "version 5"
* Latest BIOS Update (couple of weeks old).
This issue seems to have been discussed in this list previously (
https://sourceforge.net/p/tboot/mailman/message/35623784/ is one message of
that mailing thread), but it seems that they couldn't find a solution.
Any help debugging this problem would be really appreciated :)
Best Regards,
Marco
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(details about Grub2 and Policies that I am using)
This is my grub2 config related to tboot:
menuentry 'CentOS Linux GNU/Linux, with tboot 1.9.4 and Linux
3.10.0-514.16.1.el7.x86_64' --class centos --class gnu-linux --class gnu
--class os --class tboot {
insmod multiboot2
insmod part_gpt
insmod xfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2
--hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2
dd1f25a9-de82-4943-8ba9-f3a5035678a2
else
search --no-floppy --fs-uuid --set=root
dd1f25a9-de82-4943-8ba9-f3a5035678a2
fi
echo 'Loading tboot 1.9.4 ...'
multiboot2 /tboot.gz logging=serial,memory extpol=sha256
echo 'Loading Linux 3.10.0-514.16.1.el7.x86_64 ...'
module2 /vmlinuz-3.10.0-514.16.1.el7.x86_64 root=/dev/mapper/cl_txtnuc-root
ro crashkernel=auto rd.lvm.lv=cl_txtnuc/root rd.lvm.lv=cl_txtnuc/swap rhgb
quiet intel_iommu=on noefi
echo 'Loading initial ramdisk ...'
module2 /initramfs-3.10.0-514.16.1.el7.x86_64.img
echo 'Loading sinit 5th_gen_i5_i7_SINIT_79.BIN ...'
module2 /5th_gen_i5_i7_SINIT_79.BIN
echo 'Loading tboot policy data file lcp.data ...'
module2 /lcp.data
}
I have tried creating a Policy with the lcp-gen2 files, as well as creating
my own. In both cases it did not work. What follows is the policy I am
using, with explanation of each field.
policy.pol, written to TPM Index 0x1400001, size 102 bytes.
xxd policy.pol
0000000: 0003 0b00 0001 0000 0000 0000 0000 0000 ................
0000010: 0000 0000 0000 0400 0000 ffff 0800 0800 ................
0000020: 0000 0000 0000 3f1f 5a59 07d4 3b1e 0ef3 ......?.ZY..;...
0000030: 2cda 07fe 0c7a 9c58 be39 a03e b6af d88d ,....z.X.9.>....
0000040: 8b9c b92e 6355 0000 0000 0000 0000 0000 ....cU..........
0000050: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000060: 0000 0000 0000 ......
Description:
Policy Version: 3.0 (0x0003)
Hash Algorithm: TPM_ALG_SHA256 (0x000B),
Policy Type: LCP_POLTYPE_LIST (0x00),
SINIT Min Version: 1 (0x01)
Data Revocation Counters: 0x0000 8 times.
Policy Control: Only set "OS Sinit Data Capabilities" (0x0000 0004)
Max SINIT min version: 255 (0xff)
Max BIOS AC min version: 255 (0xff)
Approved Hash Alg Mask: Only SHA256 (0x0008)
Approved Sign Alg Mask: tpm_alg_rsassa_2048_sha256 (0x0000 0008)
Aux Hash Alg Mask: None. (0x0000)
Reserved (2 bytes) (0x0000)
Policy Hash: SHA256(SHA256(Policy List)). The rest of the bytes are because
it is an union.
policy.data, saved to /boot/lcp.data, 126 bytes.
xxd tmp.data
00000000: 496e 7465 6c28 5229 2054 5854 204c 4350 Intel(R) TXT LCP
00000010: 5f50 4f4c 4943 595f 4441 5441 0000 0000 _POLICY_DATA....
00000020: 0000 0001 0102 1000 5200 0000 5200 0000 ........R...R...
00000030: 1000 0000 0100 0000 0000 0b00 0100 abc0 ................
00000040: 5dd2 0aae d8bc ab2f 3dc1 7512 e9b5 f3b7 ]....../=.u.....
00000050: 55da 3ab0 e62c 553d 45c8 4cd3 44f0 0000 U.:..,U=E.L.D...
00000060: 0000 0000 0000 0000 0000 0000 0000 0000 ................
00000070: 0000 0000 0000 0000 0000 0000 0000 ..............
File Signature: LCP_POLICY_DATA_FILE_SIGNATURE (32 bytes)
Reserved (3 bytes) (0x000000)
Num Lists: 1 (0x01)
[From here starts the LCP_POLICY_LIST2]
Version: 2.1 (0x0201)
Signature Algorithm: TPM_ALG_NULL (0x0010)
Policy Element Size: 82 bytes (0x0000 0052)
[From here starts the LCP_POLICY_ELEMENT]
Size: 82 bytes (0x0000 0052)
Type: LCP_POLELT_TYPE_MLE2 (0x0000 0010)
Policy Element Control: DEFAULT_POL_ELT_CONTROL (0x0000 0001)
[From here starts the LCP_MLE_ELEMENT2]
SINIT Min Version: 0 (0x0)
Reserved (1 byte) (0x0)
Hash Algorithm: SHA256 (0x000b)
Num Hashes: 1 (0x0001)
Hashes: SHA256 of MLE as reported by TPM 2.0 Event Log.
The hash of the LCP_LIST
is 983f986b1e16fbee53be445a8f040ea1669bf52280ae8ebf768caf05bb77e33f
SHA256(983f986b1e16fbee53be445a8f040ea1669bf52280ae8ebf768caf05bb77e33f)
= 3f1f5a5907d43b1e0ef32cda07fe0c7a9c58be39a03eb6afd88d8b9cb92e6355
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