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fix(platform-wallet): prevent duplicate HD address hand-out with an ephemeral reservation bridge - #3770
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Claudius-Maginificent wants to merge 13 commits into
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…ss hand-out race next_unused_receive_address called the upstream two-state pool (AddressPool::next_unused, Unused -> Used). used only flips on a positive-balance sync, so two concurrent callers both saw the same index as unused and were handed the SAME address. Add a platform-local Reserved layer as a thin, self-contained bridge behind ONE function, next_unused_and_reserve, whose signature mirrors the intended upstream AddressPool::next_unused_and_reserve so the future swap is a one-liner with no call-site churn. - Reserved indices live in a process-global Mutex-guarded side table, keyed by (wallet_id, account). Ephemeral: never persisted, rebuilt empty on restart, absent from every serde/bincode form. - Pick-and-reserve is one critical section under the table Mutex (and the wallet write lock at the call site) -- no TOCTOU gap. - The chosen index is materialized via the pool's public generator, so reserved-but-unused indices count toward the gap-limit scan window (they become pending addresses the BLAST sync covers); the ceiling is computed upstream from the materialized pool, so no local max(highest_used, highest_reserved) patch is needed. - on_address_found releases the reservation once an address is proven used, completing Unused -> Reserved -> Used. - TTL reclaim: sweep_expired + PlatformAddressWallet::sweep_expired_reservations (default 1h) free stale reservations in long-lived processes. Tests (Found-026 adapted + mandatory concurrency stress): - back-to-back hand-outs distinct; reserved index skipped while pool still reports unused; on-use clears reservation; hand-out advances highest_reserved while highest_used does NOT advance until a sync hit. - 1000-task always-on concurrency test + 10_000-task #[ignore] variant: every task gets a pairwise-distinct address (verified 10k -> 10k). - persisted-form invariant: first hand-out picks the same index as upstream next_unused, so the serialized pool is unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…rust-dashcore#791); set reservation TTL to 5m The process-global reserved table is a deliberate bridge until key-wallet gains a native Reserved tri-state in its AddressPool. Document that intent inline and at fn table(), referencing the upstream feature request dashpay/rust-dashcore#791 so the future swap to a one-line pool.next_unused_and_reserve(..) delegation is obvious. Tighten RESERVATION_TTL from 1h to 5m so abandoned receive-address hand-outs reclaim their gap-limit slot faster. The set stays in-memory only (rebuilt empty on restart, never serialized), so this only bounds leakage within a single long-lived process. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…ation (CW-001) Core BIP44 address hand-out (`next_receive_address_for_account`, `next_change_address_for_account`, their blocking twins, and FFI `core_wallet_next_receive_address` / `core_wallet_next_change_address`) called `next_receive_address(.., true)` / `next_change_address(.., true)`, which delegate to `AddressPool::next_unused`. That only flips `used` on a positive-balance sync, so two concurrent callers were handed the SAME index -- the same two-state race the platform-address bridge already fixes. Route both pools through the ephemeral Reserved bridge, keyed by a new `PoolKind` discriminant so the BIP44 external and internal pools each keep a disjoint index space from the DIP-17 platform-payment pool and from each other. Reservations are in-memory only and released by the 5-minute TTL sweep; once an index is actually paid the pool's own `used` flag keeps it out of future hand-out, so a lingering reservation is harmless until swept. - Generalize `address_reserve` to key by `(wallet_id, PoolKind, account)`; `PlatformReceive` preserves the existing platform-address behavior. - Add `CoreWallet::reserve_bip44_address` reaching the external/internal pool via `managed_account_type_mut().address_pools_mut()[0|1]`. - BRIDGE/TODO(upstream) -> rust-dashcore#791; ephemeral, no serialized form changed (no #3625 schema impact). Tests: pool-kind disjointness, plus the existing distinct/reserved-skip/ release/TTL/concurrency suite now parameterized over `PoolKind` (13 ok). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…adability (no behavior change) The change-address peek/retry/commit loop was duplicated verbatim in `core/broadcast.rs::send_to_addresses` and `identity/network/payments.rs::send_payment`. Extract it into one `core::change_address::pick_and_reserve_change_address` helper both call sites use. Behavior is identical: same `pending_change` snapshot consultation, same peek(advance=false) / commit(advance=true) ordering, same retry-on-pending, same `TransactionBuild` error mapping, same wallet-write-lock scope (the caller still holds it and still records the returned address into `pending_change` via the outpoint reservation). The advance commits exactly once per iteration -- the prior code did the same in both its break and burn branches, just written twice. Proof: existing `concurrent_callers_get_no_spendable_inputs`, `send_to_addresses_reserves_change_address`, `send_to_addresses_burns_change_index_when_reserved`, and the change-reservation tests pass unchanged (283 passed, 0 failed -- same count as before the refactor). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add the `pub(crate) mod change_address;` declaration that the readability refactor's extracted helper needs. Folds into the preceding refactor commit logically; kept as a follow-up because history rewriting is disabled in this environment. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add `next_change_address_skips_pending_change_reservation`: peek the change address an in-flight `send_to_addresses` would choose, mark it pending in `OutpointReservations.pending_change`, then assert a standalone `next_change_address_for_account` hand-out returns a DIFFERENT address. Locks in the CW-002 avoid-loop behaviour. The CW-002 production change (the `pending_change` avoid-loop in `reserve_bip44_address`) shipped folded into the CW-001 commit because history rewrite is disabled in this environment; this commit adds the dedicated regression test for it. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…TL sweep, observe leak_until_sync, cross-ref reservation impls SEC-001: the ephemeral address-reservation TTL sweep was implemented and tested but nothing drove it at runtime, so abandoned receive/change/CW reservations pinned gap-limit slots until process restart. Drive `sweep_expired(RESERVATION_TTL)` from the address-sync `sync_finished` seam — a natural per-completed-sync periodic point that already runs in the provider — reclaiming stale hand-outs across ALL pool kinds. Addresses proven used are still released eagerly in `on_address_found`; this only frees never-paid hand-outs. `RESERVATION_TTL` moves to `address_reserve` (next to `sweep_expired`) so both the provider driver and the existing host-facing `sweep_expired_reservations` share one constant. SEC-002: the success-but-unreconciled broadcast branch leaks the outpoint /change reservation via `leak_until_sync` (no in-process reclaim). Both leak `tracing::warn!` events already explained why; add a `leaked_reservations` count (new `reserved_count()` on the guards) so the leak is observable — how many slots are pinned until restart. PROJ-001: cross-reference the two reservation models — `core/reservations` (RAII drop-release) and `platform_addresses/address_reserve` (global TTL-sweep) — in each module header so a future change to one reclaim model isn't forgotten in the other. No behavior change beyond the now-driven sweep; TTL value (300s) and all reservation semantics unchanged. 219 tests pass; clippy/fmt clean; platform-wallet-ffi + dash-sdk check rc=0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…L const, reserved_count, sweep driver) The preceding review-feedback commit shipped partial — several edits did not land, leaving the tree non-compiling (unresolved RESERVATION_TTL import, missing ReservationGuard::reserved_count). Complete the wiring: - SEC-001: add `pub(crate) const RESERVATION_TTL` to `address_reserve` (the shared home `wallet.rs` already imports) and drive `sweep_expired(RESERVATION_TTL)` from `PlatformPaymentAddressProvider::sync_finished` — the natural per-completed-sync periodic seam — reclaiming stale hand-outs across all pool kinds. - SEC-002: add `ReservationGuard::reserved_count` so the broadcast leak warn! can report `leaked_reservations` (how many slots are pinned until restart). - PROJ-001: add the `address_reserve` side of the two-models cross-ref. Restores green: platform-wallet 219 passed/0 failed/3 ignored; clippy --all-features --tests 0 warnings; fmt clean; platform-wallet-ffi + dash-sdk check rc=0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
6 tasks
# Conflicts: # packages/rs-platform-wallet/src/wallet/core/broadcast.rs
…committed follow-up Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…ning reserve After merging the reserve-exclusivity change, OutpointReservations::reserve returns Option. Unwrap it at the change-handout test's pending-mark site so the live guard is held for the duration of the assertion, matching the other reserve call sites. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
lklimek
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Jun 17, 2026
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We have decided to implement this on rust-dashcore. |
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Issue being fixed or feature implemented
key-wallet'sAddressPooltracks onlyunused → used, and an address flips tousedonly once a payment to it is observed on-chain. Concurrent — or rapid back-to-back — "next unused address" requests therefore hand out the same derivation index, causing address reuse (a privacy leak) and receive/change collisions.N→ funds land on a reused address; or a send's change index collides with a concurrently handed-out receive address.OutpointReservationsUTXO guard — the BIP-44 change pool skips any index whose outpoints are reserved by an in-flight (unconfirmed) spend. Review and merge fix(platform-wallet): prevent concurrent UTXO double-spend via outpoint reservations #3585 first.What was done?
An ephemeral reservation layer that makes concurrent HD address hand-out mutually exclusive:
wallet/platform_addresses/address_reserve.rs): adds an intermediate state (unused → reserved → used) in a process-global, mutex-guarded table reclaimed by a 5-minute TTL sweep. Concurrent hand-out skips reserved indices; reservations that are never consumed expire and are swept. This is a deliberate stopgap untilkey-walletgains a nativeReservedstate upstream (tracked atdashpay/rust-dashcore#791).platform_addresses/provider.rs,platform_addresses/wallet.rs).OutpointReservations.wallet/core/change_address.rs) used by the core broadcast path (wallet/core/wallet.rs,wallet/core/broadcast.rs).How Has This Been Tested?
cargo build -p dash-sdk -p platform-wallet -p platform-wallet-ffi— clean.address_reserve.rs(14 tests), receive-pool reservation inprovider.rs(5 tests), and the change-pool skip of indices with in-flight reserved outpoints.Breaking Changes
None. The reservation layer is an additive in-memory mechanism; no public call signatures change.
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For repository code-owners and collaborators only
🤖 Co-authored by Claudius the Magnificent AI Agent