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import type { Duplex } from 'stream'
import type { IncomingMessage, ServerResponse } from 'node:http'
import { parseUrl } from '../../../lib/url'
import { warnOnce } from '../../../build/output/log'
import { isCsrfOriginAllowed } from '../../app-render/csrf-protection'
function warnOrBlockRequest(
res: ServerResponse | Duplex,
origin: string | undefined,
mode: 'warn' | 'block'
): boolean {
const originString = origin ? `from ${origin}` : ''
if (mode === 'warn') {
warnOnce(
`Cross origin request detected ${originString} to /_next/* resource. In a future major version of Next.js, you will need to explicitly configure "allowedDevOrigins" in next.config to allow this.\nRead more: https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins`
)
return false
}
warnOnce(
`Blocked cross-origin request ${originString} to /_next/* resource. To allow this, configure "allowedDevOrigins" in next.config\nRead more: https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins`
)
if ('statusCode' in res) {
res.statusCode = 403
}
res.end('Unauthorized')
return true
}
function isInternalDevEndpoint(req: IncomingMessage): boolean {
if (!req.url) return false
try {
// TODO: We should standardize on a single prefix for this
const isMiddlewareRequest = req.url.includes('/__nextjs')
const isInternalAsset = req.url.includes('/_next')
// Static media requests are excluded, as they might be loaded via CSS and would fail
// CORS checks.
const isIgnoredRequest =
req.url.includes('/_next/image') ||
req.url.includes('/_next/static/media')
return !isIgnoredRequest && (isInternalAsset || isMiddlewareRequest)
} catch (err) {
return false
}
}
export const blockCrossSite = (
req: IncomingMessage,
res: ServerResponse | Duplex,
allowedDevOrigins: string[] | undefined,
hostname: string | undefined
): boolean => {
// in the future, these will be blocked by default when allowed origins aren't configured.
// for now, we warn when allowed origins aren't configured
const mode = typeof allowedDevOrigins === 'undefined' ? 'warn' : 'block'
const allowedOrigins = [
'*.localhost',
'localhost',
...(allowedDevOrigins || []),
]
if (hostname) {
allowedOrigins.push(hostname)
}
// only process internal URLs/middleware
if (!isInternalDevEndpoint(req)) {
return false
}
// block non-cors request from cross-site e.g. script tag on
// different host
if (
req.headers['sec-fetch-mode'] === 'no-cors' &&
req.headers['sec-fetch-site'] === 'cross-site'
) {
return warnOrBlockRequest(res, undefined, mode)
}
// ensure websocket requests from allowed origin
const rawOrigin = req.headers['origin']
if (rawOrigin) {
const parsedOrigin = parseUrl(rawOrigin)
if (parsedOrigin) {
const originLowerCase = parsedOrigin.hostname.toLowerCase()
if (!isCsrfOriginAllowed(originLowerCase, allowedOrigins)) {
return warnOrBlockRequest(res, originLowerCase, mode)
}
}
}
return false
}
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