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Merge pull request #127 from ArnasDon/feat/flows-cron-timing-safe

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fix(flows): constant-time compare for cron secret
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Arnas Donauskas 2026-05-22 15:58:38 +03:00 committed by GitHub
commit 1a6419b815
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1 changed files with 12 additions and 2 deletions
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14
src/app/api/flows/cron/route.ts
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@ -1,3 +1,4 @@
import { timingSafeEqual } from 'node:crypto'
import { NextResponse } from 'next/server'
import { supabaseAdmin } from '@/lib/flows/admin-client'
import { resolveFallbackPolicy } from '@/lib/flows/fallback'
@ -30,8 +31,17 @@ export async function GET(request: Request) {
if (!expected) {
return NextResponse.json({ error: 'cron not configured' }, { status: 503 })
}
const supplied = request.headers.get('x-cron-secret')
if (supplied !== expected) {
// Constant-time compare so an attacker who can hit the endpoint
// can't recover the secret byte-by-byte from response-time deltas.
// Length pre-check is required by timingSafeEqual (throws otherwise)
// and leaks only the length itself, which isn't sensitive.
const supplied = request.headers.get('x-cron-secret') ?? ''
const suppliedBuf = Buffer.from(supplied)
const expectedBuf = Buffer.from(expected)
if (
suppliedBuf.length !== expectedBuf.length ||
!timingSafeEqual(suppliedBuf, expectedBuf)
) {
return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
}