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session.ts
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session.ts
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import { SignJWT } from 'jose'
import { base64ToArray } from 'shared-edge'
import { cache, redirect } from '@solidjs/router'
import {
CookieManager,
EncryptedCookieManager,
SignedCookieManager,
} from '~/cookieManager'
import { getRequestEvent } from 'solid-js/web'
import { type EnvVars } from './env'
import type { FetchEvent } from '@solidjs/start/server'
import { base64url } from '@scure/base'
import { type UserId } from 'shared/brand'
import { hubSessionCookieName, csrfSignatureCookieName } from 'shared/headers'
import { throwExp } from 'shared/utility'
const sessionMaxAgeSeconds = 60 * 60 * 24 * 30 // 30 days
const sessionCM = new SignedCookieManager(hubSessionCookieName, {
secure: true,
sameSite: 'lax',
path: '/',
maxAge: sessionMaxAgeSeconds,
httpOnly: true,
domain: import.meta.env.VITE_HUB_DOMAIN, // sadly, making cookies target specific subdomains from the main domain seems very hacky
})
// lowTODO store this on the client in a cross-domain compatible way - it need not be a cookie https://stackoverflow.com/q/34790887
// intentionally not encrypted or signed. This cookie only stores an HMACed CSRF token.
const csrfSignatureCM = new CookieManager(csrfSignatureCookieName, {
secure: true,
sameSite: 'lax',
path: '/',
maxAge: 60 * 60 * 24 * 30, // 30 days
httpOnly: false,
domain: import.meta.env.VITE_HUB_DOMAIN, // sadly, making cookies target specific subdomains from the main domain seems very hacky
})
// encrypted due to https://security.stackexchange.com/a/140889
const oauthStateCM = new EncryptedCookieManager('__Host-oauthState', {
secure: true,
sameSite: 'lax',
path: '/',
maxAge: 60 * 60 * 24, // 1 day
httpOnly: true,
// domain: "", // intentionally missing to exclude subdomains
})
// encrypted due to https://stackoverflow.com/a/67520418 https://stackoverflow.com/a/67979777
const oauthCodeVerifierCM = new EncryptedCookieManager(
'__Host-oauthCodeVerifier',
{
secure: true,
sameSite: 'lax',
path: '/',
maxAge: 60 * 60 * 24, // 1 day
httpOnly: true,
// domain: "", // intentionally missing to exclude subdomains
},
)
const hubInfoMaxAgeSeconds = 60 * 60 * 24 * 30 // 30 days
const hubInfoCM = new SignedCookieManager('__Host-hubInfo', {
secure: true,
sameSite: 'lax',
path: '/',
maxAge: hubInfoMaxAgeSeconds,
httpOnly: true,
// domain: "", // intentionally missing to exclude subdomains
})
let envCache: Env | undefined
export const env = (event?: FetchEvent) => {
if (envCache != null) return envCache
envCache =
(event ?? getRequestEvent()!).nativeEvent.context.cloudflare?.env ??
(process.env as unknown as EnvVars)
return envCache
}
export function getCsrfSignature() {
const cookie = getRequestEvent()!.request.headers.get('Cookie')
const csrfSignature = csrfSignatureCM.parse(cookie)
if (typeof csrfSignature !== 'string' || csrfSignature.length === 0) {
return null
}
return csrfSignature
}
export async function getOauthState(request: Request) {
const cookie = request.headers.get('Cookie')
return await oauthStateCM.parse(cookie, env().oauthStateSecret)
}
export async function getOauthCodeVerifier(request: Request) {
const cookie = request.headers.get('Cookie')
return await oauthCodeVerifierCM.parse(cookie, env().oauthCodeVerifierSecret)
}
export interface HubSession {
sub: UserId
jti: string
}
export async function getSession() {
const event = getRequestEvent()
if (event == null) return null
const cookie = event.request.headers.get('Cookie')
const payload = await sessionCM.parse(cookie, env().hubSessionSecret)
if (payload == null) return null
return {
sub: (payload.sub as UserId) ?? throwExp(),
jti: payload.jti ?? throwExp(),
}
}
export async function getUserId() {
const session = await getSession()
return session?.sub ?? null
}
export async function requireUserId(redirectTo?: string) {
const r = await getUserId()
if (r == null) {
redirectTo ??= new URL(getRequestEvent()!.request.url).pathname
const searchParams = new URLSearchParams([['redirectTo', redirectTo]])
throw redirect(`/login?${searchParams.toString()}`) as unknown
}
return r
}
function requireCsrfSignature(redirectTo: string) {
const csrfSignature = getCsrfSignature()
if (csrfSignature == null) {
const searchParams = new URLSearchParams([['redirectTo', redirectTo]])
throw redirect(`/login?${searchParams.toString()}`) as unknown
}
return csrfSignature
}
// eslint-disable-next-line @typescript-eslint/require-await
export const getCsrfSignatureCached = cache(async (pathname: string) => {
'use server'
return requireCsrfSignature(pathname)
}, 'csrfSignature')
export async function requireSession(redirectTo?: string) {
const session = await getSession()
if (session == null) {
redirectTo ??= new URL(getRequestEvent()!.request.url).pathname
const searchParams = new URLSearchParams([['redirectTo', redirectTo]])
throw redirect(`/login?${searchParams.toString()}`) as unknown
}
return session
}
export function logout() {
const headers = new Headers()
headers.append('Set-Cookie', sessionCM.clear())
headers.append('Set-Cookie', csrfSignatureCM.clear())
return redirect('/login', {
headers,
})
}
export async function createUserSession(
userId: string,
redirectTo: string,
): Promise<Response> {
const [csrf, csrfSignature] = await generateCsrf()
const headers = new Headers()
const expires = new Date(new Date().getTime() + sessionMaxAgeSeconds * 1000)
const cookie = await sessionCM.serialize(
new SignJWT({})
.setSubject(userId)
// use 256-bit csrf as JTI https://www.rfc-editor.org/rfc/rfc7519#section-4.1.7 https://security.stackexchange.com/a/220810 https://security.stackexchange.com/a/248434
.setJti(csrf)
// .setNotBefore() // highTODO
// .setIssuedAt()
// .setIssuer("urn:example:issuer")
// .setAudience("urn:example:audience")
.setExpirationTime(expires),
env().hubSessionSecret,
)
headers.append('Set-Cookie', cookie)
// https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#double-submit-cookie
// If you ever separate csrf from the session cookie https://security.stackexchange.com/a/220810 https://security.stackexchange.com/a/248434
// REST endpoints may need csrf https://security.stackexchange.com/q/166724
headers.append('Set-Cookie', csrfSignatureCM.serialize(csrfSignature))
headers.append('Set-Cookie', oauthStateCM.clear())
headers.append('Set-Cookie', oauthCodeVerifierCM.clear())
return redirect(redirectTo, {
headers,
})
}
export async function createLoginHeaders(
oauthState: string,
codeVerifier: string,
) {
const headers = new Headers()
const [oauthStateCookie, codeVerifierCookie] = await Promise.all([
oauthStateCM.serialize(oauthState, env().oauthStateSecret),
oauthCodeVerifierCM.serialize(codeVerifier, env().oauthCodeVerifierSecret),
])
headers.append('Set-Cookie', oauthStateCookie)
headers.append('Set-Cookie', codeVerifierCookie)
return headers
}
export async function createInfoHeaders(info: string) {
const expires = new Date(new Date().getTime() + hubInfoMaxAgeSeconds * 1000)
const infoJwt = new SignJWT({ info }).setExpirationTime(expires)
const headers = new Headers()
headers.append(
'Set-Cookie',
await hubInfoCM.serialize(infoJwt, env().hubInfoSecret),
)
return headers
}
export async function getInfo(request: Request) {
const payload = await hubInfoCM.parse(
request.headers.get('Cookie'),
env().hubInfoSecret,
)
if (payload == null) return null
return (payload.info as string) ?? throwExp()
}
let maybeCsrfKey: CryptoKey | null = null
async function getCsrfKey(): Promise<CryptoKey> {
if (maybeCsrfKey == null) {
maybeCsrfKey = await crypto.subtle.importKey(
'raw',
base64ToArray(env().csrfSecret),
{ name: 'HMAC', hash: 'SHA-256' },
false,
['sign', 'verify'],
)
}
return maybeCsrfKey
}
async function generateCsrf(): Promise<[string, string]> {
const csrfBytes = crypto.getRandomValues(new Uint8Array(32))
const csrfKey = await getCsrfKey()
const csrfSignature = await crypto.subtle.sign('HMAC', csrfKey, csrfBytes)
return [
base64url.encode(csrfBytes).substring(0, 43),
base64url.encode(new Uint8Array(csrfSignature)).substring(0, 43),
]
}
export async function isInvalidCsrf(
csrfSignature: string,
csrf: string,
): Promise<boolean> {
const csrfKey = await getCsrfKey()
const signature = base64url.decode(csrfSignature + '=')
const data = base64url.decode(csrf + '=')
const isValid = await crypto.subtle.verify('HMAC', csrfKey, signature, data)
return !isValid
}