Exemplo n.º 1
0
Arquivo: acl.c Projeto: mkrufky/linux
static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
						struct page *dpage)
{
	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	void *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (type == ACL_TYPE_ACCESS)
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

	retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
	if (retval > 0) {
		value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = f2fs_getxattr(inode, name_index, "", value,
							retval, dpage);
	}

	if (retval > 0)
		acl = f2fs_acl_from_disk(value, retval);
	else if (retval == -ENODATA)
		acl = NULL;
	else
		acl = ERR_PTR(retval);
	kfree(value);

	return acl;
}
Exemplo n.º 2
0
struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
{
	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	void *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (type == ACL_TYPE_ACCESS)
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

	retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = f2fs_getxattr(inode, name_index, "", value, retval);
	}

	if (retval > 0)
		acl = f2fs_acl_from_disk(value, retval);
	else if (retval == -ENODATA)
		acl = NULL;
	else
		acl = ERR_PTR(retval);
	kfree(value);

	if (!IS_ERR(acl))
		set_cached_acl(inode, type, acl);

	return acl;
}
Exemplo n.º 3
0
static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
		struct dentry *dentry, const char *name, void *buffer,
		size_t size)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);

	switch (handler->flags) {
	case F2FS_XATTR_INDEX_USER:
		if (!test_opt(sbi, XATTR_USER))
			return -EOPNOTSUPP;
		break;
	case F2FS_XATTR_INDEX_TRUSTED:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		break;
	case F2FS_XATTR_INDEX_SECURITY:
		break;
	default:
		return -EINVAL;
	}
	if (strcmp(name, "") == 0)
		return -EINVAL;
	return f2fs_getxattr(d_inode(dentry), handler->flags, name,
			     buffer, size, NULL);
}
Exemplo n.º 4
0
struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
	void *value = NULL;
	struct posix_acl *acl;
	int retval;

	if (!test_opt(sbi, POSIX_ACL))
		return NULL;

	acl = get_cached_acl(inode, type);
	if (acl != ACL_NOT_CACHED)
		return acl;

	if (type == ACL_TYPE_ACCESS)
		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;

	retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = f2fs_getxattr(inode, name_index, "", value, retval);
	}

	if (retval < 0) {
		if (retval == -ENODATA)
			acl = NULL;
		else
			acl = ERR_PTR(retval);
	} else {
		acl = f2fs_acl_from_disk(value, retval);
	}
	kfree(value);
	if (!IS_ERR(acl))
		set_cached_acl(inode, type, acl);

	return acl;
}
Exemplo n.º 5
0
int _f2fs_get_encryption_info(struct inode *inode)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct f2fs_crypt_info *crypt_info;
	char full_key_descriptor[F2FS_KEY_DESC_PREFIX_SIZE +
				(F2FS_KEY_DESCRIPTOR_SIZE * 2) + 1];
	struct key *keyring_key = NULL;
	struct f2fs_encryption_key *master_key;
	struct f2fs_encryption_context ctx;
	const struct user_key_payload *ukp;
	struct crypto_ablkcipher *ctfm;
	const char *cipher_str;
	char raw_key[F2FS_MAX_KEY_SIZE];
	char mode;
	int res;

	res = f2fs_crypto_initialize();
	if (res)
		return res;
retry:
	crypt_info = ACCESS_ONCE(fi->i_crypt_info);
	if (crypt_info) {
		if (!crypt_info->ci_keyring_key ||
				key_validate(crypt_info->ci_keyring_key) == 0)
			return 0;
		f2fs_free_encryption_info(inode, crypt_info);
		goto retry;
	}

	res = f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
				&ctx, sizeof(ctx), NULL);
	if (res < 0)
		return res;
	else if (res != sizeof(ctx))
		return -EINVAL;
	res = 0;

	crypt_info = kmem_cache_alloc(f2fs_crypt_info_cachep, GFP_NOFS);
	if (!crypt_info)
		return -ENOMEM;

	crypt_info->ci_flags = ctx.flags;
	crypt_info->ci_data_mode = ctx.contents_encryption_mode;
	crypt_info->ci_filename_mode = ctx.filenames_encryption_mode;
	crypt_info->ci_ctfm = NULL;
	crypt_info->ci_keyring_key = NULL;
	memcpy(crypt_info->ci_master_key, ctx.master_key_descriptor,
				sizeof(crypt_info->ci_master_key));
	if (S_ISREG(inode->i_mode))
		mode = crypt_info->ci_data_mode;
	else if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
		mode = crypt_info->ci_filename_mode;
	else
		BUG();

	switch (mode) {
	case F2FS_ENCRYPTION_MODE_AES_256_XTS:
		cipher_str = "xts(aes)";
		break;
	case F2FS_ENCRYPTION_MODE_AES_256_CTS:
		cipher_str = "cts(cbc(aes))";
		break;
	default:
		printk_once(KERN_WARNING
			    "f2fs: unsupported key mode %d (ino %u)\n",
			    mode, (unsigned) inode->i_ino);
		res = -ENOKEY;
		goto out;
	}

	memcpy(full_key_descriptor, F2FS_KEY_DESC_PREFIX,
					F2FS_KEY_DESC_PREFIX_SIZE);
	sprintf(full_key_descriptor + F2FS_KEY_DESC_PREFIX_SIZE,
					"%*phN", F2FS_KEY_DESCRIPTOR_SIZE,
					ctx.master_key_descriptor);
	full_key_descriptor[F2FS_KEY_DESC_PREFIX_SIZE +
					(2 * F2FS_KEY_DESCRIPTOR_SIZE)] = '\0';
	keyring_key = request_key(&key_type_logon, full_key_descriptor, NULL);
	if (IS_ERR(keyring_key)) {
		res = PTR_ERR(keyring_key);
		keyring_key = NULL;
		goto out;
	}
	crypt_info->ci_keyring_key = keyring_key;
	BUG_ON(keyring_key->type != &key_type_logon);
	ukp = user_key_payload(keyring_key);
	if (ukp->datalen != sizeof(struct f2fs_encryption_key)) {
		res = -EINVAL;
		goto out;
	}
	master_key = (struct f2fs_encryption_key *)ukp->data;
	BUILD_BUG_ON(F2FS_AES_128_ECB_KEY_SIZE !=
				F2FS_KEY_DERIVATION_NONCE_SIZE);
	BUG_ON(master_key->size != F2FS_AES_256_XTS_KEY_SIZE);
	res = f2fs_derive_key_aes(ctx.nonce, master_key->raw,
				  raw_key);
	if (res)
		goto out;

	ctfm = crypto_alloc_ablkcipher(cipher_str, 0, 0);
	if (!ctfm || IS_ERR(ctfm)) {
		res = ctfm ? PTR_ERR(ctfm) : -ENOMEM;
		printk(KERN_DEBUG
		       "%s: error %d (inode %u) allocating crypto tfm\n",
		       __func__, res, (unsigned) inode->i_ino);
		goto out;
	}
	crypt_info->ci_ctfm = ctfm;
	crypto_ablkcipher_clear_flags(ctfm, ~0);
	crypto_tfm_set_flags(crypto_ablkcipher_tfm(ctfm),
			     CRYPTO_TFM_REQ_WEAK_KEY);
	res = crypto_ablkcipher_setkey(ctfm, raw_key,
					f2fs_encryption_key_size(mode));
	if (res)
		goto out;

	memzero_explicit(raw_key, sizeof(raw_key));
	if (cmpxchg(&fi->i_crypt_info, NULL, crypt_info) != NULL) {
		f2fs_free_crypt_info(crypt_info);
		goto retry;
	}
	return 0;

out:
	if (res == -ENOKEY && !S_ISREG(inode->i_mode))
		res = 0;

	f2fs_free_crypt_info(crypt_info);
	memzero_explicit(raw_key, sizeof(raw_key));
	return res;
}
Exemplo n.º 6
0
static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
{
	return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
				ctx, len, NULL);
}