From patchwork Wed Jan 20 18:28:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 367928 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66C56C433DB for ; Wed, 20 Jan 2021 18:42:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3522223406 for ; Wed, 20 Jan 2021 18:42:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404511AbhATSdm (ORCPT ); Wed, 20 Jan 2021 13:33:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:51500 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404412AbhATS3t (ORCPT ); Wed, 20 Jan 2021 13:29:49 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D82C223406; Wed, 20 Jan 2021 18:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611167331; bh=SUj/MlQHr88sV3NN5eFNe9q4T8TjqCyDnCTD+64V3NA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d0/jk6gTAZFHh7t+yP2WyG3LSuJ/BSMXHM+3lNWzJaGi5lMwZ9szf9jGm7B05VlGL fftcj4eLYh3kxaBwWpK1xWGYEYc/N/LuClGeVDWE47Qc7Pav2+yNbfZfQwv7xKftar xNw/YortTvMIiN20ne5ZNisY1zuwktBjce77Aofr/SJcnk0DBLm5d2eLiDIM8nhuli vwgQimR68xnMZjkwHBMKfUBgw6FTWiXV2NYwixo1N/IrmfHxXfsO0IwyJVUzOfr9O/ zB3/Mb0IzwslhF4xbldV+5ISn5RlWThg6mW18njkGYn9CtyRqGal9gnhYzvTgXMxJZ kbAEklXeBrYfQ== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH v4 03/17] fscrypt: export fscrypt_fname_encrypt and fscrypt_fname_encrypted_size Date: Wed, 20 Jan 2021 13:28:33 -0500 Message-Id: <20210120182847.644850-4-jlayton@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210120182847.644850-1-jlayton@kernel.org> References: <20210120182847.644850-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org For ceph, we want to use our own scheme for handling filenames that are are longer than NAME_MAX after encryption and base64 encoding. This allows us to have a consistent view of the encrypted filenames for clients that don't support fscrypt and clients that do but that don't have the key. Export fscrypt_fname_encrypt. Rename fscrypt_fname_encrypted_size to __fscrypt_fname_encrypted_size and add a new wrapper called fscrypt_fname_encrypted_size that takes an inode argument rahter than a pointer to a fscrypt_policy union. Signed-off-by: Jeff Layton --- fs/crypto/fname.c | 19 ++++++++++++++----- fs/crypto/fscrypt_private.h | 9 +++------ fs/crypto/hooks.c | 6 +++--- include/linux/fscrypt.h | 4 ++++ 4 files changed, 24 insertions(+), 14 deletions(-) diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index 32b1f50433ba..5a794de7f61d 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -126,6 +126,7 @@ int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname, return 0; } +EXPORT_SYMBOL(fscrypt_fname_encrypt); /** * fname_decrypt() - decrypt a filename @@ -244,9 +245,9 @@ int fscrypt_base64_decode(const char *src, int len, u8 *dst) } EXPORT_SYMBOL(fscrypt_base64_decode); -bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, - u32 orig_len, u32 max_len, - u32 *encrypted_len_ret) +bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, + u32 orig_len, u32 max_len, + u32 *encrypted_len_ret) { int padding = 4 << (fscrypt_policy_flags(policy) & FSCRYPT_POLICY_FLAGS_PAD_MASK); @@ -260,6 +261,15 @@ bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, return true; } +bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len, + u32 max_len, u32 *encrypted_len_ret) +{ + return __fscrypt_fname_encrypted_size(&inode->i_crypt_info->ci_policy, + orig_len, max_len, + encrypted_len_ret); +} +EXPORT_SYMBOL(fscrypt_fname_encrypted_size); + /** * fscrypt_fname_alloc_buffer() - allocate a buffer for presented filenames * @max_encrypted_len: maximum length of encrypted filenames the buffer will be @@ -422,8 +432,7 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname, return ret; if (fscrypt_has_encryption_key(dir)) { - if (!fscrypt_fname_encrypted_size(&dir->i_crypt_info->ci_policy, - iname->len, + if (!fscrypt_fname_encrypted_size(dir, iname->len, dir->i_sb->s_cop->max_namelen, &fname->crypto_buf.len)) return -ENAMETOOLONG; diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 3fa965eb3336..195de6d0db40 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -292,14 +292,11 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num, const struct fscrypt_info *ci); /* fname.c */ -int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname, - u8 *out, unsigned int olen); -bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, - u32 orig_len, u32 max_len, - u32 *encrypted_len_ret); +bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, + u32 orig_len, u32 max_len, + u32 *encrypted_len_ret); /* hkdf.c */ - struct fscrypt_hkdf { struct crypto_shash *hmac_tfm; }; diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c index a73b0376e6f3..e65c19aae041 100644 --- a/fs/crypto/hooks.c +++ b/fs/crypto/hooks.c @@ -228,9 +228,9 @@ int fscrypt_prepare_symlink(struct inode *dir, const char *target, * counting it (even though it is meaningless for ciphertext) is simpler * for now since filesystems will assume it is there and subtract it. */ - if (!fscrypt_fname_encrypted_size(policy, len, - max_len - sizeof(struct fscrypt_symlink_data), - &disk_link->len)) + if (!__fscrypt_fname_encrypted_size(policy, len, + max_len - sizeof(struct fscrypt_symlink_data), + &disk_link->len)) return -ENAMETOOLONG; disk_link->len += sizeof(struct fscrypt_symlink_data); diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index e300f6145ddc..b5c31baaa8bf 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -212,6 +212,10 @@ int fscrypt_drop_inode(struct inode *inode); /* fname.c */ int fscrypt_base64_encode(const u8 *src, int len, char *dst); int fscrypt_base64_decode(const char *src, int len, u8 *dst); +bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len, + u32 max_len, u32 *encrypted_len_ret); +int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname, + u8 *out, unsigned int olen); int fscrypt_setup_filename(struct inode *inode, const struct qstr *iname, int lookup, struct fscrypt_name *fname);