mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
bcbc9b0cf6
This patch defines a new template called 'ima-sig', which includes the file signature in the template data, in addition to the file's digest and pathname. A template is composed of a set of fields. Associated with each field is an initialization and display function. This patch defines a new template field called 'sig', the initialization function ima_eventsig_init(), and the display function ima_show_template_sig(). This patch modifies the .field_init() function definition to include the 'security.ima' extended attribute and length. Changelog: - remove unused code (Dmitry Kasatkin) - avoid calling ima_write_template_field_data() unnecesarily (Roberto Sassu) - rename DATA_FMT_SIG to DATA_FMT_HEX - cleanup ima_eventsig_init() based on Roberto's comments Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
111 lines
2.9 KiB
C
111 lines
2.9 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/slab.h>
|
|
#include <linux/err.h>
|
|
#include <crypto/hash_info.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;
|
|
struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
|
|
const char *op = "add_boot_aggregate";
|
|
const char *audit_cause = "ENOMEM";
|
|
int result = -ENOMEM;
|
|
int violation = 0;
|
|
struct {
|
|
struct ima_digest_data hdr;
|
|
char digest[TPM_DIGEST_SIZE];
|
|
} hash;
|
|
|
|
memset(iint, 0, sizeof(*iint));
|
|
memset(&hash, 0, sizeof(hash));
|
|
iint->ima_hash = &hash.hdr;
|
|
iint->ima_hash->algo = HASH_ALGO_SHA1;
|
|
iint->ima_hash->length = SHA1_DIGEST_SIZE;
|
|
|
|
if (ima_used_chip) {
|
|
result = ima_calc_boot_aggregate(&hash.hdr);
|
|
if (result < 0) {
|
|
audit_cause = "hashing_error";
|
|
kfree(entry);
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
result = ima_alloc_init_template(iint, NULL, boot_aggregate_name,
|
|
NULL, 0, &entry);
|
|
if (result < 0)
|
|
return;
|
|
|
|
result = ima_store_template(entry, violation, NULL,
|
|
boot_aggregate_name);
|
|
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[TPM_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("IMA: No TPM chip found, activating TPM-bypass!\n");
|
|
|
|
rc = ima_init_crypto();
|
|
if (rc)
|
|
return rc;
|
|
rc = ima_init_template();
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
ima_add_boot_aggregate(); /* boot aggregate must be first entry */
|
|
ima_init_policy();
|
|
|
|
return ima_fs_init();
|
|
}
|