예제 #1
0
/*
 * This function writes the digest of an event (without size limit).
 */
int ima_eventdigest_ng_init(struct ima_event_data *event_data,
			    struct ima_field_data *field_data)
{
	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
	u32 cur_digestsize = 0;

	if (event_data->violation)	/* recording a violation. */
		goto out;

	cur_digest = event_data->iint->ima_hash->digest;
	cur_digestsize = event_data->iint->ima_hash->length;

	hash_algo = event_data->iint->ima_hash->algo;
out:
	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
					   hash_algo, field_data);
}
/*
 * This function writes the digest of an event (with size limit).
 */
int ima_eventdigest_init(struct integrity_iint_cache *iint, struct file *file,
			 const unsigned char *filename,
			 struct evm_ima_xattr_data *xattr_value, int xattr_len,
			 struct ima_field_data *field_data)
{
	struct {
		struct ima_digest_data hdr;
		char digest[IMA_MAX_DIGEST_SIZE];
	} hash;
	u8 *cur_digest = NULL;
	u32 cur_digestsize = 0;
	struct inode *inode;
	int result;

	memset(&hash, 0, sizeof(hash));

	if (!iint)		/* recording a violation. */
		goto out;

	if (ima_template_hash_algo_allowed(iint->ima_hash->algo)) {
		cur_digest = iint->ima_hash->digest;
		cur_digestsize = iint->ima_hash->length;
		goto out;
	}

	if (!file)		/* missing info to re-calculate the digest */
		return -EINVAL;

	inode = file_inode(file);
	hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
	    ima_hash_algo : HASH_ALGO_SHA1;
	result = ima_calc_file_hash(file, &hash.hdr);
	if (result) {
		integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
				    filename, "collect_data",
				    "failed", result, 0);
		return result;
	}
	cur_digest = hash.hdr.digest;
	cur_digestsize = hash.hdr.length;
out:
	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
					   HASH_ALGO__LAST, field_data);
}
/*
 * This function writes the digest of an event (without size limit).
 */
int ima_eventdigest_ng_init(struct integrity_iint_cache *iint,
			    struct file *file, const unsigned char *filename,
			    struct evm_ima_xattr_data *xattr_value,
			    int xattr_len, struct ima_field_data *field_data)
{
	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
	u32 cur_digestsize = 0;

	/* If iint is NULL, we are recording a violation. */
	if (!iint)
		goto out;

	cur_digest = iint->ima_hash->digest;
	cur_digestsize = iint->ima_hash->length;

	hash_algo = iint->ima_hash->algo;
out:
	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
					   hash_algo, field_data);
}