fix(Headers): don't forward secure headers to 3th party (#1449)
* fix(Headers): don't forward secure headers to 3th party * added more narrow test for isDomainOrSubdomain
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13
src/index.js
13
src/index.js
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@ -21,6 +21,7 @@ import Request, {getNodeRequestOptions} from './request.js';
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import {FetchError} from './errors/fetch-error.js';
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import {AbortError} from './errors/abort-error.js';
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import {isRedirect} from './utils/is-redirect.js';
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import {isDomainOrSubdomain} from './utils/is.js';
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import {parseReferrerPolicyFromHeader} from './utils/referrer.js';
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export {Headers, Request, Response, FetchError, AbortError, isRedirect};
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@ -188,6 +189,18 @@ export default async function fetch(url, options_) {
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referrerPolicy: request.referrerPolicy
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};
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// when forwarding sensitive headers like "Authorization",
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// "WWW-Authenticate", and "Cookie" to untrusted targets,
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// headers will be ignored when following a redirect to a domain
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// that is not a subdomain match or exact match of the initial domain.
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// For example, a redirect from "foo.com" to either "foo.com" or "sub.foo.com"
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// will forward the sensitive headers, but a redirect to "bar.com" will not.
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if (!isDomainOrSubdomain(request.url, locationURL)) {
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for (const name of ['authorization', 'www-authenticate', 'cookie', 'cookie2']) {
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requestOptions.headers.delete(name);
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}
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}
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// HTTP-redirect fetch step 9
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if (response_.statusCode !== 303 && request.body && options_.body instanceof Stream.Readable) {
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reject(new FetchError('Cannot follow redirect with body being a readable stream', 'unsupported-redirect'));
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@ -56,3 +56,20 @@ export const isAbortSignal = object => {
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)
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);
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};
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/**
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* isDomainOrSubdomain reports whether sub is a subdomain (or exact match) of
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* the parent domain.
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*
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* Both domains must already be in canonical form.
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* @param {string|URL} original
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* @param {string|URL} destination
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*/
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export const isDomainOrSubdomain = (destination, original) => {
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const orig = new URL(original).hostname;
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const dest = new URL(destination).hostname;
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return orig === dest || (
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orig[orig.length - dest.length - 1] === '.' && orig.endsWith(dest)
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);
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};
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61
test/main.js
61
test/main.js
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@ -35,6 +35,7 @@ import ResponseOrig from '../src/response.js';
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import Body, {getTotalBytes, extractContentType} from '../src/body.js';
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import TestServer from './utils/server.js';
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import chaiTimeout from './utils/chai-timeout.js';
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import {isDomainOrSubdomain} from '../src/utils/is.js';
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const AbortControllerPolyfill = abortControllerPolyfill.AbortController;
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const encoder = new TextEncoder();
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@ -496,6 +497,66 @@ describe('node-fetch', () => {
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});
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});
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it('should not forward secure headers to 3th party', async () => {
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const res = await fetch(`${base}redirect-to/302/https://httpbin.org/get`, {
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headers: new Headers({
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cookie: 'gets=removed',
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cookie2: 'gets=removed',
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authorization: 'gets=removed',
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'www-authenticate': 'gets=removed',
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'other-safe-headers': 'stays',
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'x-foo': 'bar'
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})
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});
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const headers = new Headers((await res.json()).headers);
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// Safe headers are not removed
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expect(headers.get('other-safe-headers')).to.equal('stays');
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expect(headers.get('x-foo')).to.equal('bar');
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// Unsafe headers should not have been sent to httpbin
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expect(headers.get('cookie')).to.equal(null);
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expect(headers.get('cookie2')).to.equal(null);
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expect(headers.get('www-authenticate')).to.equal(null);
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expect(headers.get('authorization')).to.equal(null);
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});
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it('should forward secure headers to same host', async () => {
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const res = await fetch(`${base}redirect-to/302/${base}inspect`, {
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headers: new Headers({
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cookie: 'is=cookie',
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cookie2: 'is=cookie2',
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authorization: 'is=authorization',
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'other-safe-headers': 'stays',
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'www-authenticate': 'is=www-authenticate',
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'x-foo': 'bar'
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})
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});
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const headers = new Headers((await res.json()).headers);
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// Safe headers are not removed
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expect(res.url).to.equal(`${base}inspect`);
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expect(headers.get('other-safe-headers')).to.equal('stays');
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expect(headers.get('x-foo')).to.equal('bar');
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// Unsafe headers should not have been sent to httpbin
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expect(headers.get('cookie')).to.equal('is=cookie');
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expect(headers.get('cookie2')).to.equal('is=cookie2');
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expect(headers.get('www-authenticate')).to.equal('is=www-authenticate');
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expect(headers.get('authorization')).to.equal('is=authorization');
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});
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it('isDomainOrSubdomain', () => {
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// Forwarding headers to same (sub)domain are OK
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expect(isDomainOrSubdomain('http://a.com', 'http://a.com')).to.be.true;
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expect(isDomainOrSubdomain('http://a.com', 'http://www.a.com')).to.be.true;
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expect(isDomainOrSubdomain('http://a.com', 'http://foo.bar.a.com')).to.be.true;
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// Forwarding headers to parent domain, another sibling or a totally other domain is not ok
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expect(isDomainOrSubdomain('http://b.com', 'http://a.com')).to.be.false;
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expect(isDomainOrSubdomain('http://www.a.com', 'http://a.com')).to.be.false;
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expect(isDomainOrSubdomain('http://bob.uk.com', 'http://uk.com')).to.be.false;
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expect(isDomainOrSubdomain('http://bob.uk.com', 'http://xyz.uk.com')).to.be.false;
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});
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it('should treat broken redirect as ordinary response (follow)', () => {
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const url = `${base}redirect/no-location`;
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return fetch(url).then(res => {
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@ -245,6 +245,12 @@ export default class TestServer {
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res.end();
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}
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if (p.startsWith('/redirect-to/3')) {
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res.statusCode = p.slice(13, 16);
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res.setHeader('Location', p.slice(17));
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res.end();
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}
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if (p === '/redirect/302') {
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res.statusCode = 302;
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res.setHeader('Location', '/inspect');
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