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fix(security): isolate session cost ledger keys

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Use Map-backed cost ledgers so externally derived session and run identifiers never cross ordinary object prototype semantics. Preserve the existing JSON storage format and extend browser and isolated ledger regressions for replay, overflow, legacy data, and reserved keys.
This commit is contained in:
Alexandre Teixeira
2026-10-06 00:25:24 +01:00
parent 56e06de545
commit 39b8563213
3 changed files with 118 additions and 38 deletions
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tests/pr6503_security_browser.cjs
+34 -5
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@@ -114,7 +114,7 @@ function documentFunction(name, text = source) {
await page.setContent('<!doctype html><textarea id="doc-editor-textarea"></textarea>');
const ledger = await page.evaluate(async () => {
const { recordSessionMetricsCost, getSessionCost } = await import('/static/js/chatRenderer.js');
const { recordSessionMetricsCost, getSessionCost, resetSessionCost } = await import('/static/js/chatRenderer.js');
const metrics = id => ({ model: 'gpt-4o', input_tokens: 100, output_tokens: 10,
endpoint_cost_tracked: true, _costRecordId: id });
const before = Object.getOwnPropertyDescriptors(Object.prototype);
@@ -149,11 +149,37 @@ function documentFunction(name, text = source) {
await navigator.locks.request('odysseus-session-cost-ledger', () => {});
for (let i = 0; i < 257; i++) recordSessionMetricsCost(metrics('run-' + i), 'overflow-session');
await navigator.locks.request('odysseus-session-cost-ledger', () => {});
// Snapshot all ordinary-ledger results before the reserved-key fixture
// deliberately replaces localStorage below.
const replayCost = getSessionCost('safe-session');
const legacyCost = getSessionCost('legacy-session');
const dottedCost = getSessionCost('safe.__proto__.session');
const overflowCost = getSessionCost('overflow-session');
const runWire = JSON.parse(localStorage.getItem('ody-session-cost-runs') || '{}');
const costWire = JSON.parse(localStorage.getItem('ody-session-cost') || '{}');
const retainedRuns = Object.keys(runWire['overflow-session']).length;
const wireShape = !Array.isArray(runWire)
&& !Array.isArray(costWire)
&& !!runWire['overflow-session']
&& !Array.isArray(runWire['overflow-session']);
// A persisted legacy/reserved key must remain data rather than becoming
// prototype state. Reading and removing it must also be side-effect free.
localStorage.setItem('ody-session-cost', '{"__proto__":1}');
localStorage.setItem('ody-session-cost-runs', '{"__proto__":{"legacy-run":2}}');
const legacyReservedCost = getSessionCost('__proto__');
resetSessionCost('__proto__');
const clearedReserved = !Object.hasOwn(
JSON.parse(localStorage.getItem('ody-session-cost') || '{}'),
'__proto__',
) && !Object.hasOwn(
JSON.parse(localStorage.getItem('ody-session-cost-runs') || '{}'),
'__proto__',
);
const after = Object.getOwnPropertyDescriptors(Object.prototype);
return { cost, replayCost: getSessionCost('safe-session'), legacyCost: getSessionCost('legacy-session'),
dottedCost: getSessionCost('safe.__proto__.session'),
overflowCost: getSessionCost('overflow-session'),
retainedRuns: Object.keys(JSON.parse(localStorage.getItem('ody-session-cost-runs'))['overflow-session']).length,
return { cost, replayCost, legacyCost, dottedCost,
overflowCost, retainedRuns, wireShape, legacyReservedCost, clearedReserved,
unchanged: Reflect.ownKeys(before).length === Reflect.ownKeys(after).length
&& Reflect.ownKeys(before).every(key => Reflect.ownKeys(before[key]).every(field => before[key][field] === after[key]?.[field])) };
});
@@ -164,6 +190,9 @@ function documentFunction(name, text = source) {
assert.equal(ledger.dottedCost, ledger.cost);
assert(Math.abs(ledger.overflowCost - 257 * ledger.cost) < 1e-10);
assert.equal(ledger.retainedRuns, 256);
assert.equal(ledger.wireShape, true);
assert.equal(ledger.legacyReservedCost, 3);
assert.equal(ledger.clearedReserved, true);
const names = ['_unfoldEmailHeaderLines', '_parseEmailHeader', '_looksLikeWrappedEmailContent', '_decodeBase64EmailWrapper',
'_sanitizeOutgoingEmailBody', '_emailHtmlToPlainText', '_aiReply',