97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2005,2006,2007,2008 IBM Corporation
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Reiner Sailer <sailer@watson.ibm.com>
|
||
|
|
* Leendert van Doorn <leendert@watson.ibm.com>
|
||
|
|
* Mimi Zohar <zohar@us.ibm.com>
|
||
|
|
*
|
||
|
|
* This program 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, version 2 of the
|
||
|
|
* License.
|
||
|
|
*
|
||
|
|
* File: ima_init.c
|
||
|
|
* initialization and cleanup functions
|
||
|
|
*/
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/scatterlist.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include "ima.h"
|
||
|
|
|
||
|
|
/* name for boot aggregate entry */
|
||
|
|
static const char *boot_aggregate_name = "boot_aggregate";
|
||
|
|
int ima_used_chip;
|
||
|
|
|
||
|
|
/* Add the boot aggregate to the IMA measurement list and extend
|
||
|
|
* the PCR register.
|
||
|
|
*
|
||
|
|
* Calculate the boot aggregate, a SHA1 over tpm registers 0-7,
|
||
|
|
* assuming a TPM chip exists, and zeroes if the TPM chip does not
|
||
|
|
* exist. Add the boot aggregate measurement to the measurement
|
||
|
|
* list and extend the PCR register.
|
||
|
|
*
|
||
|
|
* If a tpm chip does not exist, indicate the core root of trust is
|
||
|
|
* not hardware based by invalidating the aggregate PCR value.
|
||
|
|
* (The aggregate PCR value is invalidated by adding one value to
|
||
|
|
* the measurement list and extending the aggregate PCR value with
|
||
|
|
* a different value.) Violations add a zero entry to the measurement
|
||
|
|
* list and extend the aggregate PCR value with ff...ff's.
|
||
|
|
*/
|
||
|
|
static void __init ima_add_boot_aggregate(void)
|
||
|
|
{
|
||
|
|
struct ima_template_entry *entry;
|
||
|
|
const char *op = "add_boot_aggregate";
|
||
|
|
const char *audit_cause = "ENOMEM";
|
||
|
|
int result = -ENOMEM;
|
||
|
|
int violation = 1;
|
||
|
|
|
||
|
|
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
|
||
|
|
if (!entry)
|
||
|
|
goto err_out;
|
||
|
|
|
||
|
|
memset(&entry->template, 0, sizeof(entry->template));
|
||
|
|
strncpy(entry->template.file_name, boot_aggregate_name,
|
||
|
|
IMA_EVENT_NAME_LEN_MAX);
|
||
|
|
if (ima_used_chip) {
|
||
|
|
violation = 0;
|
||
|
|
result = ima_calc_boot_aggregate(entry->template.digest);
|
||
|
|
if (result < 0) {
|
||
|
|
audit_cause = "hashing_error";
|
||
|
|
kfree(entry);
|
||
|
|
goto err_out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
result = ima_store_template(entry, violation, NULL);
|
||
|
|
if (result < 0)
|
||
|
|
kfree(entry);
|
||
|
|
return;
|
||
|
|
err_out:
|
||
|
|
integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
|
||
|
|
audit_cause, result, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
int __init ima_init(void)
|
||
|
|
{
|
||
|
|
u8 pcr_i[IMA_DIGEST_SIZE];
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
ima_used_chip = 0;
|
||
|
|
rc = tpm_pcr_read(TPM_ANY_NUM, 0, pcr_i);
|
||
|
|
if (rc == 0)
|
||
|
|
ima_used_chip = 1;
|
||
|
|
|
||
|
|
if (!ima_used_chip)
|
||
|
|
pr_info("No TPM chip found, activating TPM-bypass!\n");
|
||
|
|
|
||
|
|
ima_add_boot_aggregate(); /* boot aggregate must be first entry */
|
||
|
|
ima_init_policy();
|
||
|
|
|
||
|
|
return ima_fs_init();
|
||
|
|
}
|
||
|
|
|
||
|
|
void __exit ima_cleanup(void)
|
||
|
|
{
|
||
|
|
ima_fs_cleanup();
|
||
|
|
}
|