18ad93be4520ad1000b78b896903b70192893823
2 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
| 18ad93be45 |
harden: make the background physically unable to read the shared state singleton (closes #324)
Five defects traced to one fact: src/background/index.js read and wrote the
module-level `state` singleton in src/shared/state.js, which the MV3 service
worker never populates and which answered an unpopulated read out of
DEFAULT_STATE in silence. Every previous fix added a loadState() before the
access, and that is what produced the fifth: a load detaches the objects an
in-flight handler is holding.
So the reachability goes rather than a sixth call site.
The background now has its own storage layer, src/background/state.js:
getState() is a detached, normalized per-call read, and updateState() is a
queued read-modify-write whose read is one storage round trip ahead of its
write. Nothing in the background holds an in-memory copy of the profile.
- Every handler takes one snapshot and answers from it, including the address
it names: activeAddressOf(s) replaced a second, later storage read that
could disagree with the first.
- wallet_switchEthereumChain applies applyChainSwitchFields() (split out of
chainSwitch.js, which keeps the singleton path for the popup) inside
updateState() instead of calling onChainSwitch() on the singleton.
- The remembered site decision is a read-modify-write, not a load-mutate-save
around a prompt the user takes seconds to answer.
- backgroundRefresh() refreshes a private copy of the wallets and applies the
balances that came back by address, so it never publishes an object other
in-flight work holds, and a wallet added or deleted during the round trip
survives its write.
- The transaction attempt takes its chain id and its endpoint from the same
snapshot. They used to come from different moments, so a chain switch
committed in between moved the endpoint under an artifact already verified
against the old chain.
getProvider(rpcUrl, networkId) now REQUIRES the network id and validates it
against networks.js. That closes the cold-worker wrong-chain send at its shape
rather than at one call site: the hint used to default to currentNetwork() off
the unpopulated singleton, so the endpoint was the user's chain and ethers
fixed chainId at 0x1, and the wallet's own verifySignedTx then refused every
non-mainnet dApp send. refreshBalances(), lookupTokenInfo(), scanForAddresses()
and resolveEnsName() carry the id through; balances.js no longer requires
state.js at all.
The prohibition is enforced mechanically, not by review, and it is enforced by
the bundler rather than by a guess at what the bundler does. The table of
modules an entry point's bundle may not contain lives in
script/lib/forbiddenBundleInputs.js — one copy, read by both layers that act on
it — and build.js's assertNoForbiddenInputs() fails the build when esbuild's
metafile reports src/shared/state.js as an input of a background bundle, naming
the import chain from the metafile's own graph. That is the resolution the
shipped bundle was built from, so no specifier syntax, no hop and no resolution
rule can slip past it; Dockerfile:42 runs make build, so it holds in CI.
Both halves of the table are checked for rot, because either one turns the
prohibition into a pass that checks nothing: a key no bundled entry point
matched fails, and so does a listed module this build bundled nowhere. The
second is what makes a rename of src/shared/state.js loud instead of silently
disarming the check, and it is stronger than an existsSync() because it also
fails when the module is still there but has dropped out of every bundle. What
the assertion does NOT cover is a COPY of the singleton at another path: it is
keyed by path, so a copy builds and lints clean. That is stated where the table
lives, with the reason it is accepted — a copy carries the singleton's own
guard, so a background read of it throws rather than being served DEFAULT_STATE.
make check does not run make build, so the assertion is unit tested against
synthetic metafiles in tests/buildForbiddenInputs.test.js: build.js runs its
build() only as a program now and exports the checks. Executing a check in CI
is not testing it — without that file, inverting the condition leaves every
check in this repo green with the singleton back in the worker.
A custom ESLint rule walks the CommonJS require graph from every src/background/
file and reports the same thing in the editor, before a full bundle. It reads
the same table, and it matches specifiers textually, so it is best-effort fast
feedback and not the guarantee — two earlier revisions of it shipped holes (a
template literal, a dynamic import(), a comment inside the call, a directory
resolved through package.json main). Those are covered now and pinned by
tests/backgroundStateLintRule.test.js. Two shapes it does not report are
recorded in its header as known divergences the build catches, both measured: a
computed specifier (require("../shared/" + "state"), which esbuild
constant-folds into the bundle) and a symlink to the module (esbuild reports the
real path). Each is make lint exit 0 and make build exit 2.
Reading a persisted field of the singleton before any load now throws
StateNotLoadedError instead of serving DEFAULT_STATE.
Test stubs: chrome.storage.local is a serialization boundary, and eight files
stubbed it with an aliasing get, so the object a module held and the object
"storage" held were one object — an assertion could pass on a build that never
wrote anything. Every test that drives real persistence now goes through
tests/support/storageStub.js, which structured-clones in both directions.
closes #320
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| 20e911059a |
fix: give a wallet whose password is lost a way out, and say the password cannot be reset (closes #312)
A user who forgot their password but held their recovery phrase was permanently locked out: deletion was password-gated and re-importing the phrase was refused as a duplicate. Their only escape was destroying extension storage through browser internals, taking every other wallet with it. DeleteWallet gains an "I have lost my password" route that destroys the stored secret after the wallet's name is typed back. No password gate was added: requiring one to discard a secret protects nothing, since an attacker who wants destruction can uninstall the extension, and the only person it stops is the legitimate user who lost it. The screen is excluded from RESTORABLE_VIEWS and registers an onViewLeave cleanup. Deletion was chosen over re-import because a key wallet is duplicate-checked by address rather than xpub, so an xpub-only relaxation would leave that user still wedged; because re-import makes the user retype their recovery phrase into a live popup merely to change a password; and because it reaches no end state that delete-then-import plus scanForAddresses() does not. The attacker argument did not decide it — re-import clears the "no worse than the phrase alone" bar. All three AddWallet password hints now state the password cannot be recovered or reset and name that mode's only backup, the xprv mode correctly claiming no recovery phrase. deleteAddress.js no longer tells the user that deleting a wallet asks for a password, which this change made false. The typed confirmation collapses internal whitespace on both sides: a wallet renamed with two spaces displays with one, so the string a user could see and type could never match, making the confirmation untypable on the one screen whose purpose is un-wedging a stuck user. Measured, not reasoned, after review found the first reserve twice too large and pushing the Import button below the fold: #btn-add-wallet-confirm bottom 628.13 -> 580.13 at 360x600, scrollHeight 636 -> 600, hint box 48px identical across all three tabs and on re-entry. make check 40 suites / 828 tests, test-e2e 55/55, test-e2e-firefox 8/8. |
