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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2018 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/>.
*
* Core TPM support code.
*/
#include <grub/err.h>
#include <grub/i18n.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/tpm.h>
#include <grub/term.h>
#include <grub/verify.h>
#include <grub/dl.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_err_t
grub_tpm_verify_init (grub_file_t io,
enum grub_file_type type __attribute__ ((unused)),
void **context, enum grub_verify_flags *flags)
{
*context = io->name;
*flags |= GRUB_VERIFY_FLAGS_SINGLE_CHUNK;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_tpm_verify_write (void *context, void *buf, grub_size_t size)
{
return grub_tpm_measure (buf, size, GRUB_BINARY_PCR, context);
}
static grub_err_t
grub_tpm_verify_string (char *str, enum grub_verify_string_type type)
{
const char *prefix = NULL;
char *description;
grub_err_t status;
switch (type)
{
case GRUB_VERIFY_KERNEL_CMDLINE:
prefix = "kernel_cmdline: ";
break;
case GRUB_VERIFY_MODULE_CMDLINE:
prefix = "module_cmdline: ";
break;
case GRUB_VERIFY_COMMAND:
prefix = "grub_cmd: ";
break;
}
description = grub_malloc (grub_strlen (str) + grub_strlen (prefix) + 1);
if (!description)
return grub_errno;
grub_memcpy (description, prefix, grub_strlen (prefix));
grub_memcpy (description + grub_strlen (prefix), str,
grub_strlen (str) + 1);
status =
grub_tpm_measure ((unsigned char *) str, grub_strlen (str),
GRUB_STRING_PCR, description);
grub_free (description);
return status;
}
struct grub_file_verifier grub_tpm_verifier = {
.name = "tpm",
.init = grub_tpm_verify_init,
.write = grub_tpm_verify_write,
.verify_string = grub_tpm_verify_string,
};
GRUB_MOD_INIT (tpm)
{
grub_verifier_register (&grub_tpm_verifier);
}
GRUB_MOD_FINI (tpm)
{
grub_verifier_unregister (&grub_tpm_verifier);
}
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