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ima: support arbitrary hash algorithms in ima_calc_buffer_hash

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ima_calc_buffer_hash will be used with different hash algorithms.
This patch provides support for arbitrary hash algorithms in
ima_calc_buffer_hash.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2013-06-07 12:16:24 +02:00 committed by Mimi Zohar
parent 723326b927
commit ea593993d3
2 changed files with 25 additions and 6 deletions
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3
security/integrity/ima/ima_api.c
View file

@ -18,6 +18,7 @@
#include <linux/fs.h>
#include <linux/xattr.h>
#include <linux/evm.h>
#include <crypto/hash_info.h>
#include "ima.h"
static const char *IMA_TEMPLATE_NAME = "ima";
@ -54,6 +55,8 @@ int ima_store_template(struct ima_template_entry *entry,
entry->template_len = sizeof(entry->template);
if (!violation) {
/* this function uses default algo */
hash.hdr.algo = HASH_ALGO_SHA1;
result = ima_calc_buffer_hash(&entry->template,
entry->template_len, &hash.hdr);
if (result < 0) {

28
security/integrity/ima/ima_crypto.c
View file

@ -139,23 +139,39 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
/*
* Calculate the hash of a given buffer
*/
int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
static int ima_calc_buffer_hash_tfm(const void *buf, int len,
struct ima_digest_data *hash,
struct crypto_shash *tfm)
{
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(ima_shash_tfm)];
char ctx[crypto_shash_descsize(tfm)];
} desc;
desc.shash.tfm = ima_shash_tfm;
desc.shash.tfm = tfm;
desc.shash.flags = 0;
/* this function uses default algo */
hash->algo = ima_hash_algo;
hash->length = crypto_shash_digestsize(ima_shash_tfm);
hash->length = crypto_shash_digestsize(tfm);
return crypto_shash_digest(&desc.shash, buf, len, hash->digest);
}
int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
{
struct crypto_shash *tfm;
int rc;
tfm = ima_alloc_tfm(hash->algo);
if (IS_ERR(tfm))
return PTR_ERR(tfm);
rc = ima_calc_buffer_hash_tfm(buf, len, hash, tfm);
ima_free_tfm(tfm);
return rc;
}
static void __init ima_pcrread(int idx, u8 *pcr)
{
if (!ima_used_chip)