[linux-2.6-block.git] / security / apparmor / crypto.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AppArmor security module
 *
 * This file contains AppArmor policy loading interface function definitions.
 *
 * Copyright 2013 Canonical Ltd.
 *
 * Fns to provide a checksum of policy that has been loaded this can be
 * compared to userspace policy compiles to check loaded policy is what
 * it should be.
 */

#include <crypto/hash.h>

#include "include/apparmor.h"
#include "include/crypto.h"

static unsigned int apparmor_hash_size;

static struct crypto_shash *apparmor_tfm;

unsigned int aa_hash_size(void)
{
	return apparmor_hash_size;
}

char *aa_calc_hash(void *data, size_t len)
{
	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
	char *hash = NULL;
	int error = -ENOMEM;

	if (!apparmor_tfm)
		return NULL;

	hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
	if (!hash)
		goto fail;

	desc->tfm = apparmor_tfm;

	error = crypto_shash_init(desc);
	if (error)
		goto fail;
	error = crypto_shash_update(desc, (u8 *) data, len);
	if (error)
		goto fail;
	error = crypto_shash_final(desc, hash);
	if (error)
		goto fail;

	return hash;

fail:
	kfree(hash);

	return ERR_PTR(error);
}

int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
			 size_t len)
{
	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
	int error = -ENOMEM;
	__le32 le32_version = cpu_to_le32(version);

	if (!aa_g_hash_policy)
		return 0;

	if (!apparmor_tfm)
		return 0;

	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
	if (!profile->hash)
		goto fail;

	desc->tfm = apparmor_tfm;

	error = crypto_shash_init(desc);
	if (error)
		goto fail;
	error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
	if (error)
		goto fail;
	error = crypto_shash_update(desc, (u8 *) start, len);
	if (error)
		goto fail;
	error = crypto_shash_final(desc, profile->hash);
	if (error)
		goto fail;

	return 0;

fail:
	kfree(profile->hash);
	profile->hash = NULL;

	return error;
}

static int __init init_profile_hash(void)
{
	struct crypto_shash *tfm;

	if (!apparmor_initialized)
		return 0;

	tfm = crypto_alloc_shash("sha1", 0, 0);
	if (IS_ERR(tfm)) {
		int error = PTR_ERR(tfm);
		AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
		return error;
	}
	apparmor_tfm = tfm;
	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);

	aa_info_message("AppArmor sha1 policy hashing enabled");

	return 0;
}

late_initcall(init_profile_hash);
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
f8eb8a13 JJ	2	/*
	3	* AppArmor security module
	4	*
	5	* This file contains AppArmor policy loading interface function definitions.
	6	*
	7	* Copyright 2013 Canonical Ltd.
	8	*
f8eb8a13 JJ	9	* Fns to provide a checksum of policy that has been loaded this can be
	10	* compared to userspace policy compiles to check loaded policy is what
	11	* it should be.
	12	*/
	13
71ac7f62	14	#include <crypto/hash.h>
f8eb8a13 JJ	15
	16	#include "include/apparmor.h"
	17	#include "include/crypto.h"
	18
	19	static unsigned int apparmor_hash_size;
	20
71ac7f62	21	static struct crypto_shash *apparmor_tfm;
f8eb8a13 JJ	22
	23	unsigned int aa_hash_size(void)
	24	{
	25	return apparmor_hash_size;
	26	}
	27
5ac8c355 JJ	28	char aa_calc_hash(void data, size_t len)
5ac8c355 JJ	29	{
9814448d	30	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
5ac8c355 JJ	31	char *hash = NULL;
	32	int error = -ENOMEM;
	33
	34	if (!apparmor_tfm)
	35	return NULL;
	36
	37	hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
	38	if (!hash)
	39	goto fail;
	40
9814448d	41	desc->tfm = apparmor_tfm;
5ac8c355	42
9814448d	43	error = crypto_shash_init(desc);
5ac8c355 JJ	44	if (error)
5ac8c355 JJ	45	goto fail;
9814448d	46	error = crypto_shash_update(desc, (u8 *) data, len);
5ac8c355 JJ	47	if (error)
5ac8c355 JJ	48	goto fail;
9814448d	49	error = crypto_shash_final(desc, hash);
5ac8c355 JJ	50	if (error)
	51	goto fail;
	52
	53	return hash;
	54
	55	fail:
	56	kfree(hash);
	57
	58	return ERR_PTR(error);
	59	}
	60
f8eb8a13 JJ	61	int aa_calc_profile_hash(struct aa_profile profile, u32 version, void start,
	62	size_t len)
	63	{
9814448d	64	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
f8eb8a13	65	int error = -ENOMEM;
5ac8c355	66	__le32 le32_version = cpu_to_le32(version);
f8eb8a13	67
7616ac70 AB	68	if (!aa_g_hash_policy)
	69	return 0;
	70
f8eb8a13 JJ	71	if (!apparmor_tfm)
	72	return 0;
	73
f8eb8a13 JJ	74	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
	75	if (!profile->hash)
	76	goto fail;
	77
9814448d	78	desc->tfm = apparmor_tfm;
71ac7f62	79
9814448d	80	error = crypto_shash_init(desc);
f8eb8a13 JJ	81	if (error)
f8eb8a13 JJ	82	goto fail;
9814448d	83	error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
f8eb8a13 JJ	84	if (error)
f8eb8a13 JJ	85	goto fail;
9814448d	86	error = crypto_shash_update(desc, (u8 *) start, len);
f8eb8a13 JJ	87	if (error)
f8eb8a13 JJ	88	goto fail;
9814448d	89	error = crypto_shash_final(desc, profile->hash);
f8eb8a13 JJ	90	if (error)
	91	goto fail;
	92
	93	return 0;
	94
	95	fail:
	96	kfree(profile->hash);
	97	profile->hash = NULL;
	98
	99	return error;
	100	}
	101
	102	static int __init init_profile_hash(void)
	103	{
71ac7f62	104	struct crypto_shash *tfm;
f8eb8a13 JJ	105
	106	if (!apparmor_initialized)
	107	return 0;
	108
3d234b33	109	tfm = crypto_alloc_shash("sha1", 0, 0);
f8eb8a13 JJ	110	if (IS_ERR(tfm)) {
	111	int error = PTR_ERR(tfm);
	112	AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
	113	return error;
	114	}
	115	apparmor_tfm = tfm;
71ac7f62	116	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);
f8eb8a13 JJ	117
	118	aa_info_message("AppArmor sha1 policy hashing enabled");
	119
	120	return 0;
	121	}
	122
	123	late_initcall(init_profile_hash);