Release 4.7 security/integrity/ima/ima_init.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
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.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 int __init ima_add_boot_aggregate(void)
{
	static const char op[] = "add_boot_aggregate";
	const char *audit_cause = "ENOMEM";
	struct ima_template_entry *entry;
	struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
	struct ima_event_data event_data = {iint, NULL, boot_aggregate_name,
					    NULL, 0, NULL};
	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";
			goto err_out;
		}
	}

	result = ima_alloc_init_template(&event_data, &entry);
	if (result < 0) {
		audit_cause = "alloc_entry";
		goto err_out;
	}

	result = ima_store_template(entry, violation, NULL,
				    boot_aggregate_name);
	if (result < 0) {
		ima_free_template_entry(entry);
		audit_cause = "store_entry";
		goto err_out;
	}
	return 0;
err_out:
	integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
			    audit_cause, result, 0);
	return result;
}

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mimi zohar
mimi zohar
120
48.19%
3
27.27%
roberto sassu
roberto sassu
100
40.16%
6
54.55%
dmitry kasatkin
dmitry kasatkin
28
11.24%
1
9.09%
eric paris
eric paris
1
0.40%
1
9.09%
Total
249
100.00%
11
100.00%

#ifdef CONFIG_IMA_LOAD_X509


void __init ima_load_x509(void)
{
	int unset_flags = ima_policy_flag & IMA_APPRAISE;

	ima_policy_flag &= ~unset_flags;
	integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
	ima_policy_flag |= unset_flags;
}
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31
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2
100.00%

#endif



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("No TPM chip found, activating TPM-bypass!\n");

	rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
	if (rc)
		return rc;

	rc = ima_init_crypto();
	if (rc)
		return rc;
	rc = ima_init_template();
	if (rc != 0)
		return rc;

	rc = ima_add_boot_aggregate();	/* boot aggregate must be first entry */
	if (rc != 0)
		return rc;

	ima_init_policy();

	return ima_fs_init();
}
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mimi zohar
mimi zohar
61
53.51%
3
30.00%
dmitry kasatkin
dmitry kasatkin
26
22.81%
3
30.00%
roberto sassu
roberto sassu
25
21.93%
2
20.00%
joe perches
joe perches
1
0.88%
1
10.00%
eric paris
eric paris
1
0.88%
1
10.00%
Total
114
100.00%
10
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Overall Contributors
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CommitProp
mimi zohar
mimi zohar
207
47.59%
6
27.27%
roberto sassu
roberto sassu
125
28.74%
7
31.82%
dmitry kasatkin
dmitry kasatkin
90
20.69%
6
27.27%
joe perches
joe perches
8
1.84%
1
4.55%
tejun heo
tejun heo
3
0.69%
1
4.55%
eric paris
eric paris
2
0.46%
1
4.55%
Total
435
100.00%
22
100.00%
  
Directory: security/integrity/ima

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