When tpm2_submit_command_real() is called for a retry, the content of
out buffer can already be set with previous tpm2_submit_command_real()
call's reply. Add a call to grub_tpm2_buffer_init() before tpm2_submit_command_real().
This solves the issues occurring during TPM_CC_Load command on the
integrated TPM 2.0 in Intel Elkhart Lake chip.
Signed-off-by: Yann Diorcet <diorcet.yann@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Since there is no system firmware for grub-emu, the TPM2_PCR_Event
command becomes the only choice to implement grub_tcg2_cap_pcr().
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit introduces the definition of grub_tcg2_cap_pcr(), a new
function designed to enhance the security of sealed keys. Its primary
purpose is to "cap" a specific PCR by extending it with an EV_SEPARATOR
event. This action cryptographically alters the PCR value, making it
impossible to unseal any key that was previously sealed to the original
PCR state. Consequently, the sealed key remains protected against
unauthorized unsealing attempts until the associated PCRs are reset to
their initial configuration, typically occurring during a subsequent
system boot.
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The TPM2_PCR_Event command is introduced to tss2 to allow the user to
extend a specific PCR. The related data structure and unmarshal function
are also introduced.
However, simply invoking TPM2_PCR_Event does not automatically record
the event into the TPM event log. The TPM event log is primarily
maintained by the system firmware (e.g., BIOS/UEFI). Therefore, for most
standard use cases, the recommended method for extending PCRs and
ensuring proper event logging is to utilize the system firmware
functions.
There are specific scenarios where direct use of TPM2_PCR_Event becomes
necessary. For instance, in environments lacking system firmware support
for PCR extension, such as the grub-emu, TPM2_PCR_Event serves as the
only available method to extend PCRs.
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The following TPM 2.0 commands are introduced to tss2 to access the
TPM non-volatile memory associated with the NV index handles:
- TPM2_NV_DefineSpace,
- TPM2_NV_UndefineSpace,
- TPM2_NV_ReadPublic,
- TPM2_NV_Read,
- TPM2_NV_Write.
The related marshal/unmarshal functions are also introduced.
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
grub_tpm2_readpublic() and grub_tpm2_testparms() didn't check
authCommand when marshaling the input data buffer. Currently, there is
no caller using non-NULL authCommand. However, to avoid the potential
issue, the conditional check is added to insert authCommand into the
input buffer if necessary.
Also fix a few pointer checks.
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
grub-core/lib/tss2/tss2_structs.h contains a duplicate typedef as follows:
typedef TPMS_SCHEME_HASH_t TPMS_SCHEME_KDF2_t;
This causes a build failure when compiling with clang. Remove the
duplicate typedef which allows successfully building GRUB with clang.
Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
Reviewed-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
The TPM bit fields need to be in reverse order for big endian targets,
such as ieee1275 PowerPC platforms that run GRUB in big endian mode.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
As a preparation to test tpm2_key_protector with grub-emu, the new
option, --tpm-device, is introduced to specify the TPM device for
grub-emu so that grub-emu can access an emulated TPM device from
the host.
Since grub-emu can directly access the device on host, it's easy to
implement the essential TCG2 command submission function with the
read/write functions and enable tpm2_key_protector module for grub-emu,
so that we can further test TPM2 key unsealing with grub-emu.
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
A Trusted Platform Module (TPM) Software Stack (TSS) provides logic to
compose and submit TPM commands and parse responses.
A limited number of TPM commands may be accessed via the EFI TCG2
protocol. This protocol exposes functionality that is primarily geared
toward TPM usage within the context of Secure Boot. For all other TPM
commands, however, such as sealing and unsealing, this protocol does not
provide any help, with the exception of passthrough command submission.
The SubmitCommand method allows a caller to send raw commands to the
system's TPM and to receive the corresponding response. These
command/response pairs are formatted using the TPM wire protocol. To
construct commands in this way, and to parse the TPM's response, it is
necessary to, first, possess knowledge of the various TPM structures, and,
second, of the TPM wire protocol itself.
As such, this patch includes implementations of various grub_tpm2_* functions
(inventoried below), and logic to write and read command and response
buffers, respectively, using the TPM wire protocol.
Functions:
- grub_tpm2_create(),
- grub_tpm2_createprimary(),
- grub_tpm2_evictcontrol(),
- grub_tpm2_flushcontext(),
- grub_tpm2_load(),
- grub_tpm2_pcr_read(),
- grub_tpm2_policygetdigest(),
- grub_tpm2_policypcr(),
- grub_tpm2_readpublic(),
- grub_tpm2_startauthsession(),
- grub_tpm2_unseal(),
- grub_tpm2_loadexternal(),
- grub_tpm2_hash(),
- grub_tpm2_verifysignature(),
- grub_tpm2_policyauthorize(),
- grub_tpm2_testparms().
Signed-off-by: Hernan Gatta <hegatta@linux.microsoft.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
This commit adds the necessary TPM2 types and structs as the preparation
for the TPM2 Software Stack (TSS2) support. The Marshal/Unmarshal
functions are also added to handle the data structure to be submitted to
TPM2 commands and to be received from the response.
Signed-off-by: Hernan Gatta <hegatta@linux.microsoft.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
As the preparation to support TPM2 Software Stack (TSS2), this commit
implements the TPM2 buffer handling functions to pack data for the TPM2
commands and unpack the data from the response.
Cc: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Hernan Gatta <hegatta@linux.microsoft.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
