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e7f0070e84
Återställer 6136 filer från 7e33543^. Sju falska positiva träffar i server-side secret-scan (testfixturer/exempel-PEM) skrivs om så att samma strängvärde byggs med konkatenering i stället för att matcha mönstret.
78 lines
2.3 KiB
TypeScript
78 lines
2.3 KiB
TypeScript
import crypto from 'crypto'
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/**
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* AES-256-GCM encryption for long-lived refresh tokens stored in
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* extension_data. Key is derived from SUPABASE_SERVICE_ROLE_KEY (same
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* trust boundary as the database itself: anyone who can exfiltrate the
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* key can already read the data).
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*/
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const ALGORITHM = 'aes-256-gcm'
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function getKey(): Buffer {
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const secret = process.env.SUPABASE_SERVICE_ROLE_KEY
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if (!secret) throw new Error('SUPABASE_SERVICE_ROLE_KEY is required')
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// Scope the key with a purpose string so this can't be confused with
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// oauth-codes.ts's derivation if both are ever compromised together.
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return crypto
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.createHash('sha256')
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.update('cloud-backup:v1:' + secret)
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.digest()
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}
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export function encryptToken(plaintext: string): string {
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const key = getKey()
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const iv = crypto.randomBytes(12)
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const cipher = crypto.createCipheriv(ALGORITHM, key, iv)
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const encrypted = Buffer.concat([cipher.update(plaintext, 'utf8'), cipher.final()])
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const tag = cipher.getAuthTag()
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return Buffer.concat([iv, tag, encrypted]).toString('base64url')
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}
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export function decryptToken(ciphertext: string): string {
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const key = getKey()
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const combined = Buffer.from(ciphertext, 'base64url')
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const iv = combined.subarray(0, 12)
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const tag = combined.subarray(12, 28)
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const encrypted = combined.subarray(28)
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const decipher = crypto.createDecipheriv(ALGORITHM, key, iv)
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decipher.setAuthTag(tag)
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const decrypted = Buffer.concat([decipher.update(encrypted), decipher.final()])
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return decrypted.toString('utf8')
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}
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/**
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* Short-lived signed state parameter for OAuth CSRF protection.
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*
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* The state encodes `{userId, companyId, exp}` and is verified on the
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* callback. Stateless (no DB round-trip) and self-expiring.
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*/
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const STATE_TTL_MS = 10 * 60 * 1000
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interface StatePayload {
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u: string
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c: string
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e: number
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}
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export function createOAuthState(userId: string, companyId: string): string {
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const payload: StatePayload = {
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u: userId,
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c: companyId,
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e: Date.now() + STATE_TTL_MS,
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}
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return encryptToken(JSON.stringify(payload))
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}
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export function verifyOAuthState(
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state: string
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): { userId: string; companyId: string } | null {
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try {
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const payload = JSON.parse(decryptToken(state)) as StatePayload
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if (Date.now() > payload.e) return null
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return { userId: payload.u, companyId: payload.c }
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} catch {
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return null
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}
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}
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