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Ts'o" , Jaegeuk Kim , Eric Biggers , Chris Mason , Josef Bacik , David Sterba , linux-fscrypt@vger.kernel.org, linux-btrfs@vger.kernel.org, kernel-team@meta.com Cc: Sweet Tea Dorminy Subject: [PATCH v4 00/21] btrfs: add fscrypt integration Date: Mon, 24 Oct 2022 19:13:10 -0400 Message-Id: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is a changeset adding encryption to btrfs. Last October, Omar Sandoval sent out a design document for having fscrypt integration with btrfs [1]. In summary, it proposes btrfs storing its own encryption IVs on a per-file-extent basis. fscrypt usually encrypts files using an IV derived from per-inode information; this would prevent snapshotting or reflinking or data relocation for btrfs. We have refined this into a fscrypt extent context object, opaque to the filesystem, which fscrypt uses to generate an IV associated with each block in an extent. Thus, all the inodes sharing a particular key and file extent may decrypt the extent. This series implements this integration for the simple case, non-compressed data extents, and for verity items. Followup changes will allow encryption of compressed extents, inline extents, and will add tests around subvolume encryption. This series should provide encryption for the simplest cases, but this series should not be used in production, as there are likely bugs. This set hopefully reflects all of the feedback given on v3. I apologize if I missed any past feedback. [1] https://lore.kernel.org/linux-btrfs/YXGyq+buM79A1S0L@relinquished.localdomain/ Changelog: v4: - Dropped the partial directory encryption trio of patches, as it's an easy and orthogonal followon. - fscrypt: Changed extent-based encryption to require a direct key policy. - fscrypt: Changed to allow direct key policies with mixed filename/contents encryption modes, to enable usage of existing AES modes with btrfs. - fscrypt: Changed terminology used for extent context contents to 'nonce' instead of 'IV', to match the nonces used in direct-key policies elsewhere. - fscrypt: Changed IV generation for extent-based encryption to generate 16-byte IVs (if needed) from a 16-byte nonce plus extent offset, hopefully as discussed. - fscrypt: Updated documentation change to remove partial directory encryption. - fscrypt: Fixed another place to refer to 'inode-based' encryption instead of a more generic term. - btrfs: Factored btrfs_fscrypt_set_extent_context() as per Josef's feedback. - btrfs: Fixed a couple of style nits. - https://lore.kernel.org/linux-btrfs/cover.1666651724.git.sweettea-kernel@dorminy.me v3: - fscrypt: changed to generate extent contexts the same way as IVs are generated for inode-based encryption, allowing use of any existing policy and making the difference in encryption more minimal. - Changed to use qstr's, then fscrypt_strs, then fscrypt_names only where absolutely necessary, rather than fscrypt_names everywhere. - Reordered changes to put partially-encrypted directories, and no-key name handling, in their own sections at the end of the patchset. - Expanded on descriptions of how no-key name handling works. - Added encryption of verity items (but see notes in change about outstanding questions there) - Stylistic fixes - Renamed flags from FSCRYPT to ENCRYPT in multiple instances. - Made the incompat encrypt superblock flag be set the first time a directory is set to be encrypted, so there isn't a need for a mkfs option. - Hopefully addressed all other minor feedback points. - https://lore.kernel.org/linux-btrfs/cover.1666281276.git.sweettea-kernel@dorminy.me v2: - Amended the fscrypt side to generically add extent contexts, hopefully as per Eric Biggers' past comments. IVs are now entirely abstracted within an extent context, and there is no longer a new encryption policy, as DIRECT_KEY sufficiently encapsulates the needs of extent-based encryption. Documented its usage in btrfs briefly in the documentation. - Adjusted the btrfs side to deal in opaque extent contexts. Improved optimization to skip storing inode contexts if they are the same as the inode's root item's inode context. - Combined 'add fscrypt operation table to superblock' into 'start using fscrypt hooks'. - https://lore.kernel.org/linux-btrfs/cover.1662420176.git.sweettea-kernel@dorminy.me - progs: https://lore.kernel.org/linux-btrfs/cover.1662417859.git.sweettea-kernel@dorminy.me - tests: https://lore.kernel.org/linux-btrfs/cover.1662417905.git.sweettea-kernel@dorminy.me v1: - Recombined the fscrypt changes back into this patchset. - Fixed several races and incorrectly ordered operations. - Improved IV retrieval to correctly distinguish between filename/symlink encryption and encryption of block 0 of a file. - https://lore.kernel.org/linux-btrfs/cover.1660744500.git.sweettea-kernel@dorminy.me - progs: https://lore.kernel.org/linux-btrfs/cover.1660729916.git.sweettea-kernel@dorminy.me - tests: https://lore.kernel.org/linux-btrfs/cover.1660729861.git.sweettea-kernel@dorminy.me RFC v2: - Fixed all warnings and known incorrectnesses. - Split fscrypt changes into their own patchset: https://lore.kernel.org/linux-fscrypt/cover.1658623235.git.sweettea-kernel@dorminy.me - Combined and reordered changes so that enabling fscrypt is the last change. - Removed unnecessary factoring. - Split a cleanup change off. - https://lore.kernel.org/linux-btrfs/cover.1658623319.git.sweettea-kernel@dorminy.me RFC v1: - https://lore.kernel.org/linux-btrfs/cover.1657707686.git.sweettea-kernel@dorminy.me Omar Sandoval (11): fscrypt: expose fscrypt_nokey_name fscrypt: add fscrypt_have_same_policy() to check inode compatibility btrfs: store directory encryption state btrfs: disable various operations on encrypted inodes btrfs: start using fscrypt hooks btrfs: add fscrypt_context items btrfs: translate btrfs encryption flags and encrypted inode flag btrfs: encrypt normal file extent data if appropriate btrfs: Add new FEATURE_INCOMPAT_ENCRYPT feature flag. btrfs: implement fscrypt ioctls btrfs: permit searching for nokey names for removal Sweet Tea Dorminy (10): fscrypt: allow fscrypt_generate_iv() to distinguish filenames fscrypt: add extent-based encryption fscrypt: direct key policies for extent-based encryption fscrypt: document btrfs' fscrypt quirks. btrfs: use struct qstr instead of name and namelen btrfs: setup qstrings from dentrys using fscrypt helper btrfs: use struct fscrypt_str instead of struct qstr btrfs: store a fscrypt extent context per normal file extent btrfs: use correct name hash for nokey names btrfs: encrypt verity items Documentation/filesystems/fscrypt.rst | 31 +- fs/btrfs/Makefile | 1 + fs/btrfs/accessors.h | 44 +- fs/btrfs/btrfs_inode.h | 3 + fs/btrfs/ctree.h | 46 ++- fs/btrfs/delayed-inode.c | 36 +- fs/btrfs/delayed-inode.h | 6 +- fs/btrfs/dir-item.c | 170 ++++++-- fs/btrfs/extent_io.c | 94 ++++- fs/btrfs/extent_io.h | 3 + fs/btrfs/extent_map.c | 7 + fs/btrfs/extent_map.h | 4 + fs/btrfs/file-item.c | 25 +- fs/btrfs/file.c | 11 +- fs/btrfs/fs.h | 5 +- fs/btrfs/fscrypt.c | 287 +++++++++++++ fs/btrfs/fscrypt.h | 63 +++ fs/btrfs/inode-item.c | 73 ++-- fs/btrfs/inode-item.h | 20 +- fs/btrfs/inode.c | 560 +++++++++++++++++++------- fs/btrfs/ioctl.c | 55 ++- fs/btrfs/ordered-data.c | 11 +- fs/btrfs/ordered-data.h | 4 +- fs/btrfs/print-tree.c | 4 +- fs/btrfs/reflink.c | 8 + fs/btrfs/root-tree.c | 21 +- fs/btrfs/send.c | 13 +- fs/btrfs/super.c | 10 +- fs/btrfs/transaction.c | 40 +- fs/btrfs/tree-checker.c | 51 ++- fs/btrfs/tree-log.c | 304 +++++++------- fs/btrfs/tree-log.h | 4 +- fs/btrfs/verity.c | 114 +++++- fs/crypto/crypto.c | 40 +- fs/crypto/fname.c | 43 +- fs/crypto/fscrypt_private.h | 23 +- fs/crypto/inline_crypt.c | 28 +- fs/crypto/policy.c | 96 +++++ include/linux/fscrypt.h | 91 +++++ include/uapi/linux/btrfs.h | 1 + include/uapi/linux/btrfs_tree.h | 28 ++ 41 files changed, 1935 insertions(+), 543 deletions(-) create mode 100644 fs/btrfs/fscrypt.c create mode 100644 fs/btrfs/fscrypt.h base-commit: cc159678aee59042e24fd1b039405b4fdf7b0538