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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2024 IBM Corporation
* Copyright (C) 2024 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/tpm.h>
#include <grub/ieee1275/tpm.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <tcg2.h>
grub_ieee1275_ihandle_t grub_ieee1275_tpm_ihandle = GRUB_IEEE1275_IHANDLE_INVALID;
grub_err_t
grub_ieee1275_tpm_init (void)
{
static bool init_tried = false;
grub_ieee1275_phandle_t vtpm;
char buffer[20];
if (init_tried == false)
{
init_tried = true;
if (grub_ieee1275_open ("/vdevice/vtpm", &grub_ieee1275_tpm_ihandle) < 0 ||
grub_ieee1275_finddevice ("/vdevice/vtpm", &vtpm) ||
grub_ieee1275_get_property (vtpm, "compatible", buffer, sizeof (buffer), NULL) ||
grub_strcmp (buffer, "IBM,vtpm20"))
{
if (grub_ieee1275_tpm_ihandle != GRUB_IEEE1275_IHANDLE_INVALID)
grub_ieee1275_close (grub_ieee1275_tpm_ihandle);
grub_ieee1275_tpm_ihandle = GRUB_IEEE1275_IHANDLE_INVALID;
}
}
if (grub_ieee1275_tpm_ihandle == GRUB_IEEE1275_IHANDLE_INVALID)
return GRUB_ERR_UNKNOWN_DEVICE;
return GRUB_ERR_NONE;
}
grub_err_t
grub_tcg2_get_max_output_size (grub_size_t *size)
{
struct tpm_get_maximum_cmd_size
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t size;
};
struct tpm_get_maximum_cmd_size args;
static bool error_displayed = false;
grub_err_t err;
err = grub_ieee1275_tpm_init ();
if (err != GRUB_ERR_NONE)
return err;
INIT_IEEE1275_COMMON (&args.common, "call-method", 2, 2);
args.method = (grub_ieee1275_cell_t) "get-maximum-cmd-size";
args.ihandle = grub_ieee1275_tpm_ihandle;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return GRUB_ERR_INVALID_COMMAND;
/*
* args.catch_result is set if firmware does not support get-maximum-cmd-size.
* rc is GRUB_IEEE1275_CELL_FALSE (0) on failure.
*/
if (args.catch_result)
{
if (error_displayed == false)
{
error_displayed = true;
return grub_error (GRUB_ERR_BAD_DEVICE,
"get-maximum-cmd-size failed: Firmware is likely too old");
}
return GRUB_ERR_INVALID_COMMAND;
}
*size = args.size;
return GRUB_ERR_NONE;
}
grub_err_t
grub_tcg2_submit_command (grub_size_t input_size,
grub_uint8_t *input,
grub_size_t output_size,
grub_uint8_t *output)
{
struct tpm_pass_through_to_tpm
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t buf_size;
grub_ieee1275_cell_t buf_addr;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t resp_size;
};
struct tpm_pass_through_to_tpm args;
static bool error_displayed = false;
grub_err_t err;
if (input_size == 0 || input == NULL ||
output_size == 0 || output == NULL)
return GRUB_ERR_BAD_ARGUMENT;
err = grub_ieee1275_tpm_init ();
if (err != GRUB_ERR_NONE)
return err;
INIT_IEEE1275_COMMON (&args.common, "call-method", 4, 2);
args.method = (grub_ieee1275_cell_t) "pass-through-to-tpm";
args.ihandle = grub_ieee1275_tpm_ihandle;
args.buf_size = (grub_ieee1275_cell_t) input_size;
args.buf_addr = (grub_ieee1275_cell_t) input;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return GRUB_ERR_INVALID_COMMAND;
/* args.catch_result is set if firmware does not support pass-through-to-tpm. */
if (args.catch_result)
{
if (error_displayed == false)
{
error_displayed = true;
return grub_error (GRUB_ERR_BAD_DEVICE,
"pass-through-to-tpm failed: Firmware is likely too old");
}
return GRUB_ERR_INVALID_COMMAND;
}
grub_memcpy (output, input, args.resp_size);
return GRUB_ERR_NONE;
}
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