103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
|
/*
|
||
|
|
* 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+");
|
||
|
|
|
||
|
|
grub_err_t
|
||
|
|
grub_tpm_measure (unsigned char *buf, grub_size_t size, grub_uint8_t pcr,
|
||
|
|
const char *description)
|
||
|
|
{
|
||
|
|
return grub_tpm_log_event (buf, size, pcr, description);
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|