TapTap
34970b961c
Split FastSync's single use_metadata bundle into four independent rsync-parity attributes: preserve_perms, preserve_times, preserve_owner, preserve_group. use_metadata is now a derived transport bit (config_derived_use_metadata). CLI: real -p/--perms, -t/--times, -o/--owner, -g/--group plus --no-perms/--no-times/--no-owner/--no-group (short and long) and --no-preserve; -a is now rsync -rlptgoD; --preserve = -pt; -A implies -p; -X does not; --chmod implies -p; --usermap/--groupmap/--chown imply owner/group per side; --incremental/--delta still auto-preserve unless negated. Receiver: per-attribute FileAttrPolicy gating for files, dirs (modes applied at end of transfer), symlinks and specials; rsync -E read-bit rule; new files get source_mode & ~umask sanitized (no group/other write); per-side identity resolution; deferred directory metadata; batch dir-metadata replay; daemon modules without 'client owner = yes' no longer refuse plain -a but force super off (no ownership) with a warning. Wire: PROTOCOL_VERSION 2.21.0 -> 2.22.0 (four appended config bools, golden 653 / 95530566005420798). FileMetadata/chunk/batch framing unchanged. Docs/CHANGELOG/CMake updated to 2.22.0.
66 lines
4.1 KiB
Markdown
66 lines
4.1 KiB
Markdown
# FastSync — Session Handoff (2026-09-14)
|
|
|
|
## Current status
|
|
- **Release `v2.21.0`** tagged (`919a729`, "Release v2.21.0"); full CI green
|
|
(run 552: lint, build-and-test, ASan, UBSan, fuzz-build, coverage, valgrind).
|
|
`dev` has the release commit plus later doc-only merges (a README refresh and
|
|
this handoff).
|
|
- **Release PR #284 (`dev` -> `main`)** open, CI green (run 553).
|
|
`main` is protected: it needs review/approval to merge.
|
|
https://gitea.tap-tap.win/TapTap/FastSync/pulls/284
|
|
- **`PROTOCOL_VERSION` = `"2.22.0"`** (`src/shared/config.h`); CMake
|
|
`project(FastFileTransfer VERSION 2.22.0)`.
|
|
- Working tree clean; no wave worktrees remain.
|
|
|
|
## What landed this session
|
|
1. **Wave 8 (refactors):** Config X-macro wire table; single-owner `authorized_root`;
|
|
daemon per-module/per-host caps + cross-process auth lockout (`daemon_limits.[ch]`);
|
|
`Data` charge returns to its owning `ProtocolSession`.
|
|
2. **Wave 9 (protocol 2.21.0):** optional `STATUS_ERROR_DETAIL` rejection reasons;
|
|
server-contacting `--dry-run` (`STATUS_DRY_RUN_TRANSFER`, receiver mutates nothing).
|
|
3. **Security wave:** ran 5 parallel audits (wire parsing; daemon/transport/TLS/auth;
|
|
receiver confinement; client/CLI/SSH; crypto/memory/limits). Fixed all HIGH and the
|
|
confirmed MEDIUMs:
|
|
- SSH `-o ProxyCommand=…` argument injection (RCE) — reject leading `-`, insert `--`.
|
|
- Truncated zstd frame infinite CPU loop (remote DoS).
|
|
- FIFO receiver opens lacked `O_NONBLOCK` (indefinite hang).
|
|
- `--inplace` could write a FIFO/device (bypass of `--write-devices` gate).
|
|
- `--force` not gated by server `--allow-delete`.
|
|
- Privileged standalone server defaulted super activities on; added `--allow-super`
|
|
(never honored with `--stdio`).
|
|
- `--dry-run` content/hash oracle on `read only`/basis files removed.
|
|
- Empty `hosts allow`/`deny`/`auth users` now rejected.
|
|
- TLS: AEAD-only 1.2 + server preference, TOCTOU-safe key load, IP-SAN verify,
|
|
CN-truncation guard. Glob backtracking bounded; line reads bounded; ACL xattrs
|
|
gated on `--acls`; decompression/chunk memory charged; pre-auth `basis_count`
|
|
NULL-deref fixed.
|
|
4. **Tooling:** benchmark accuracy (data mix, verification, percentiles, `tc`,
|
|
`build-bench/`, `--warm` mode); `shell.nix` full toolchain and no build-on-entry;
|
|
docs state push-only / remote-source unsupported.
|
|
5. **Preserve-attribute split (protocol 2.22.0)** landed on `feat/preserve-attr-split`: per-attribute `-p/-t/-o/-g` + `--no-*` negations, `-a` = `-rlptgoD`, and the 2.21.0 → 2.22.0 wire bump.
|
|
|
|
## Next steps
|
|
1. **Merge PR #284** (`dev` -> `main`) once reviewed (protected branch).
|
|
2. **Deferred security items** (documented, not implemented):
|
|
- Pre-auth config/daemon-auth handshake has no aggregate wall-clock deadline
|
|
(per-message timeout only) — slowloris holds connection slots.
|
|
- Per-source registry fails open when the shared table is full (per-module/global
|
|
caps and host ACLs still apply); consider fail-closed or larger/evicting table.
|
|
- SCRAM-like daemon auth has no TLS channel binding (and is not RFC 5802).
|
|
- `cleanup()` signal handler calls non-async-signal-safe teardown; daemon `umask(0)`.
|
|
- Wire protocol assumes homogeneous word size/endianness (lengths are native
|
|
`size_t`) — document or move to fixed-width framing.
|
|
3. **Out of scope / intentional:** pull (remote source) mode is **not** planned —
|
|
FastSync is push-only; see `RSYNC_COMPAT.md#direction`.
|
|
|
|
## Key facts / commands
|
|
- CI image: `gitea.tap-tap.win/taptap/fastsync-ci:v10` (alias `fastsync-ci:local`).
|
|
- Build/test: `cmake -B build -S . -DSTRICT_WARNINGS=ON && cmake --build build -j$(nproc) && ./build/tests`
|
|
then `python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"`.
|
|
- Dev shell: `nix-shell` (provides clang-format, cppcheck, pytest-xdist, openssh,
|
|
rsync, iproute2, valgrind, lcov; does not build on entry).
|
|
- Gitea API token: supplied out-of-band via the `TOKEN` environment variable; it is
|
|
intentionally **not** recorded in this file.
|
|
- CI polling: `GET /api/v1/repos/TapTap/FastSync/actions/runs?limit=N`, match `head_sha`,
|
|
then `/actions/runs/<id>/jobs`.
|