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ima: ima_calc_boot_agregate must use SHA1

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With multiple hash algorithms, ima_hash_tfm is no longer guaranteed to be sha1.
Need to force to use sha1.

Changelog:
- pass ima_digest_data to ima_calc_boot_aggregate() instead of char *
  (Roberto Sassu);
- create an ima_digest_data structure in ima_add_boot_aggregate()
  (Roberto Sassu);
- pass hash->algo to ima_alloc_tfm() (Roberto Sassu, reported by Dmitry).
- "move hash definition in ima_add_boot_aggregate()" commit hunk to here.
- sparse warning fix - Fengguang Wu

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin 2013-06-07 12:16:25 +02:00 committed by Mimi Zohar
parent ea593993d3
commit 09ef54359c
3 changed files with 31 additions and 5 deletions
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2
security/integrity/ima/ima.h
View File

@ -73,7 +73,7 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
int ima_calc_buffer_hash(const void *data, int len,
struct ima_digest_data *hash);
int ima_calc_boot_aggregate(char *digest);
int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
void ima_add_violation(struct inode *inode, const unsigned char *filename,
const char *op, const char *cause);
int ima_init_crypto(void);

24
security/integrity/ima/ima_crypto.c
View File

@ -184,16 +184,17 @@ static void __init ima_pcrread(int idx, u8 *pcr)
/*
* Calculate the boot aggregate hash
*/
int __init ima_calc_boot_aggregate(char *digest)
static int __init ima_calc_boot_aggregate_tfm(char *digest,
struct crypto_shash *tfm)
{
u8 pcr_i[TPM_DIGEST_SIZE];
int rc, i;
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;
rc = crypto_shash_init(&desc.shash);
@ -210,3 +211,20 @@ int __init ima_calc_boot_aggregate(char *digest)
crypto_shash_final(&desc.shash, digest);
return rc;
}
int __init ima_calc_boot_aggregate(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);
hash->length = crypto_shash_digestsize(tfm);
rc = ima_calc_boot_aggregate_tfm(hash->digest, tfm);
ima_free_tfm(tfm);
return rc;
}

10
security/integrity/ima/ima_init.c
View File

@ -18,6 +18,7 @@
#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 */
@ -46,6 +47,10 @@ static void __init ima_add_boot_aggregate(void)
const char *audit_cause = "ENOMEM";
int result = -ENOMEM;
int violation = 1;
struct {
struct ima_digest_data hdr;
char digest[TPM_DIGEST_SIZE];
} hash;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
@ -56,12 +61,15 @@ static void __init ima_add_boot_aggregate(void)
IMA_EVENT_NAME_LEN_MAX);
if (ima_used_chip) {
violation = 0;
result = ima_calc_boot_aggregate(entry->template.digest);
hash.hdr.algo = HASH_ALGO_SHA1;
result = ima_calc_boot_aggregate(&hash.hdr);
if (result < 0) {
audit_cause = "hashing_error";
kfree(entry);
goto err_out;
}
memcpy(entry->template.digest, hash.hdr.digest,
hash.hdr.length);
}
result = ima_store_template(entry, violation, NULL);
if (result < 0)