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fcry/Cargo.lock
T
ddidderr fe65e1f899 feat!: argon2id passphrases, secret hardening, atomic output, manual STREAM
This commit lands four follow-up items that were explicitly deferred in
TODO.md after the prior file-format change, plus a CLI/units cleanup
that fell out of reviewing them:

  1. Manual STREAM nonce construction (drops `stream` cargo feature).
  2. Atomic file output (`.tmp` + rename, with cleanup on failure).
  3. Argon2id KDF + passphrase prompt + matching CLI flags.
  4. Hardened secret handling: zeroize-on-drop, mlock'd buffers,
     custom cross-platform tty reader (replaces `rpassword`).

Why
---
The prior version had three concrete weaknesses that were fine for
"early development" but unacceptable past that point:

  * `--raw-key` was the only way to supply a key, exposing it in
    `/proc/$pid/cmdline`. There was no passphrase mode at all.
  * Crashes/aborts during encrypt could leave a half-written output
    file in place of (or replacing) the user's target.
  * Key material wasn't zeroed and could end up in swap or coredumps.
    rpassword's reallocating String buffers also leaked stale heap
    copies of typed passphrases that no `Zeroizing` wrapper could
    reach after the fact.

(1) Manual STREAM nonces
------------------------
Replaces `aead::stream::EncryptorBE32` / `DecryptorBE32` with
explicit `make_nonce(prefix, counter, last)` and direct
`XChaCha20Poly1305::{encrypt,decrypt}_in_place` calls. The wire format
is unchanged (XChaCha20Poly1305 STREAM-BE32 = 19-byte prefix || 4-byte
big-endian counter || 1-byte last-block flag), so files written by the
previous version still decrypt. Counter overflow is now an explicit
`Format` error rather than a panic in the upstream stream wrapper.

This removes the `stream` cargo feature from `chacha20poly1305` and
prepares the encrypt path for parallelism: with explicit nonces we can
hand chunks to a worker pool keyed by counter without the stream
wrapper's stateful API getting in the way.

(2) Atomic file output
----------------------
New `utils::OutSink` writes to `<path>.tmp`, calls `sync_all()` on
`commit()`, and renames into place. If dropped without commit (panic,
crypto/IO error, ctrl-C), the temp file is unlinked so the existing
target is untouched. Stdout output is unaffected (no temp dance).

A new integration test (`atomic_output_no_stale_tmp_on_failure`)
verifies that a failed decrypt leaves neither the final output nor
the temp file behind.

(3) Argon2id + passphrase
-------------------------
New `KdfParams::Argon2id { salt, m_cost, t_cost, p_cost }` variant
encoded into the header (and authenticated as AAD), so tampering with
KDF params fails authentication on every chunk.

CLI surface (BREAKING):
  * `--raw-key` is now optional; one of `--raw-key`, `--passphrase`,
    `--passphrase-env <VAR>` is required.
  * `--passphrase` prompts on the controlling terminal with echo off,
    and asks for confirmation when encrypting.
  * `--passphrase-env <VAR>` reads from a named env var; intended for
    non-interactive use (scripts, tests). The env-table copy is a
    known leak for that path.
  * `--argon-memory <MiB>` (default 1024 = 1 GiB), `--argon-passes`
    (default 2), `--argon-parallelism` (default 4). Names follow
    argon2 RFC 9106 terminology; memory is MiB rather than KiB to
    match how humans actually think about RAM. Defaults follow the
    "Balanced" preset for 2026-era hardware (~1.5–4 s on a laptop).
    The argon2 crate wants KiB internally, so the CLI value is
    multiplied by 1024 with overflow-check.

(4) Secret hardening
--------------------
New `secrets` module provides:

  * `SecretBytes32`: heap-allocated 32-byte buffer wrapped in
    `Zeroizing<[u8; 32]>` and mlock'd via the `region` crate.
    Field order ensures the lock guard drops *before* the buffer is
    freed (otherwise munlock would target freed memory).
  * `SecretVec`: fixed-capacity, mlock'd, zeroize-on-drop byte
    buffer. `push()` rejects writes past the reserved capacity so
    the underlying allocation never reallocates and moves — which
    would invalidate the lock and leave a stale unzeroed copy on
    the heap.
  * `read_passphrase_tty()`: direct tty reader. On Unix, opens
    `/dev/tty`, clears `ECHO` via `tcgetattr`/`tcsetattr` with an
    RAII guard that restores termios on drop. On Windows, opens
    `CONIN$`/`CONOUT$` and clears `ENABLE_ECHO_INPUT` via
    `Get/SetConsoleMode`. Reads byte-by-byte into a pre-reserved
    `SecretVec` (1024 bytes), so neither the Rust side nor the libc
    side reallocates during read. This replaces `rpassword`, which
    returned a `String` that grew by reallocation and left
    unzeroed copies of typed passphrases on the heap.

`PartialEq` on `SecretVec` is constant-time-ish (length check +
xor-or accumulate) so the confirmation comparison doesn't early-out
on the first differing byte.

`disable_core_dumps()` calls `setrlimit(CORE, 0)` on Unix; on
Windows it's a no-op (WER/minidump suppression is a per-machine
policy and intentionally not done here).

`Cli`'s secret-bearing fields are moved out into local bindings at
the top of `run()` and the `Cli` is explicitly dropped, so they
don't sit in the parsed struct for the rest of the function.
`Cli.raw_key` is `Option<Zeroizing<String>>` so the field we own
zeroes itself on drop. Clap's own intermediate copies during
parsing are an accepted leak.

Threat model — what is and isn't covered
-----------------------------------------
Covered (best-effort):
  * Secrets in coredumps                  → rlimit on Unix.
  * Secrets paged to swap or hibernation  → mlock on the AEAD key
                                            and passphrase buffer.
  * Half-written ciphertext on crash      → atomic rename.
  * Stale heap copies of typed passphrase → custom tty reader,
                                            pre-reserved buffer.
  * Stale stack/heap copies of the AEAD
    key or passphrase post-process-exit   → zeroize on drop.

Not covered (and not pretending to be):
  * Live-process attackers with ptrace or `/proc/$pid/mem` access.
  * The kernel's tty/line buffer.
  * Clap's transient String allocations during arg parsing.
  * The `environ` table copy of an env-var passphrase.
  * Swap on systems without functioning mlock or with
    `RLIMIT_MEMLOCK = 0`.

mlock is small (32 bytes + 1024 bytes — two pages at most on any
of the three target OSes), so it fits well under the typical
unprivileged `RLIMIT_MEMLOCK` of 64 KiB.

Portability
-----------
The whole binary targets Linux, macOS, and Windows 11 with the
same security properties where the OS supports them:

  * `region` crate provides cross-platform mlock/munlock.
  * `libc::tcgetattr`/`tcsetattr` covers Linux + macOS.
  * `windows-sys` covers Console API.
  * `rlimit` is gated to `cfg(unix)`.

The Windows tty path compiles in my head but is unverified on this
machine — there is no `x86_64-pc-windows-*` target installed and
no Windows runner. Treat that path as "best-effort, needs CI on
Windows" until exercised.

Files written by the previous v0.10 (Raw KDF, BE32 STREAM) are
still readable: the wire format is unchanged for that path.

Test plan
---------
Existing 17 integration tests pass unchanged. Two new tests:

  * `roundtrip_passphrase_argon2id` — encrypts and decrypts via
    `--passphrase-env` with cheap argon2 params (8 MiB / 1 pass) so
    the test stays fast; also verifies that a wrong passphrase
    fails.
  * `atomic_output_no_stale_tmp_on_failure` — wrong-key decrypt
    leaves neither the final file nor the `.tmp` in place.

Manual sanity (not automated): run with `--passphrase` on a
terminal and confirm echo is off and confirmation works.

Follow-ups (still in TODO.md)
-----------------------------
  * Multi-threaded encrypt pipeline (now feasible — manual nonces).
  * Length-committed mode + random-access decrypt fast path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-02 18:26:44 +02:00

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