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strict redirection uri

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This commit is contained in:
Kagami Sascha Rosylight
2023-04-10 14:49:18 +02:00
parent 333d6a9283
commit f6d9cf1ef1
6 changed files with 127 additions and 34 deletions
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2
packages/backend/package.json
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@@ -101,6 +101,7 @@
"got": "13.0.0",
"happy-dom": "9.20.3",
"hpagent": "1.2.0",
"http-link-header": "^1.1.0",
"ioredis": "5.3.2",
"ip-cidr": "3.1.0",
"ipaddr.js": "2.1.0",
@@ -180,6 +181,7 @@
"@types/escape-regexp": "0.0.1",
"@types/express-session": "^1.17.6",
"@types/fluent-ffmpeg": "2.1.21",
"@types/http-link-header": "^1.0.3",
"@types/jest": "29.5.2",
"@types/js-yaml": "4.0.5",
"@types/jsdom": "21.1.1",

59
packages/backend/src/server/oauth/OAuth2ProviderService.ts
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@@ -2,7 +2,7 @@ import dns from 'node:dns/promises';
import { Inject, Injectable } from '@nestjs/common';
import fastifyMiddie, { IncomingMessageExtended } from '@fastify/middie';
import { JSDOM } from 'jsdom';
import parseLinkHeader from 'parse-link-header';
import httpLinkHeader from 'http-link-header';
import ipaddr from 'ipaddr.js';
import oauth2orize, { type OAuth2 } from 'oauth2orize';
import * as oauth2Query from 'oauth2orize/lib/response/query.js';
@@ -103,18 +103,33 @@ function validateClientId(raw: string): URL {
// return `uid:${uid}`;
// }
async function fetchFromClientId(httpRequestService: HttpRequestService, id: string): Promise<string | void> {
interface ClientInformation {
id: string;
redirectUris: string[];
name: string;
}
async function discoverClientInformation(httpRequestService: HttpRequestService, id: string): Promise<ClientInformation> {
try {
const res = await httpRequestService.send(id);
let redirectUri = parseLinkHeader(res.headers.get('link'))?.redirect_uri?.url;
if (redirectUri) {
return new URL(redirectUri, res.url).toString();
const redirectUris: string[] = [];
const linkHeader = res.headers.get('link');
if (linkHeader) {
redirectUris.push(...httpLinkHeader.parse(linkHeader).get('rel', 'redirect_uri').map(r => r.uri));
}
redirectUri = JSDOM.fragment(await res.text()).querySelector<HTMLLinkElement>('link[rel=redirect_uri][href]')?.href;
if (redirectUri) {
return new URL(redirectUri, res.url).toString();
}
const fragment = JSDOM.fragment(await res.text());
redirectUris.push(...[...fragment.querySelectorAll<HTMLLinkElement>('link[rel=redirect_uri][href]')].map(el => el.href));
const name = fragment.querySelector<HTMLElement>('.h-app .p-name')?.textContent?.trim() ?? id;
return {
id,
redirectUris: redirectUris.map(uri => new URL(uri, res.url).toString()),
name,
};
} catch {
throw new Error('Failed to fetch client information');
}
@@ -267,7 +282,7 @@ async function fetchFromClientId(httpRequestService: HttpRequestService, id: str
// };
// }
function pkceS256(codeVerifier: string) {
function pkceS256(codeVerifier: string): string {
return crypto.createHash('sha256')
.update(codeVerifier, 'ascii')
.digest('base64url');
@@ -362,7 +377,7 @@ export class OAuth2ProviderService {
}
TEMP_GRANT_CODES[code] = {
clientId: client,
clientId: client.id,
userId: user.id,
redirectUri,
codeChallenge: areq.codeChallenge,
@@ -470,7 +485,7 @@ export class OAuth2ProviderService {
reply.header('Cache-Control', 'no-store');
return await reply.view('oauth', {
transactionId: oauth2.transactionID,
clientId: oauth2.client,
clientName: oauth2.client.name,
scope: scopes.join(' '),
});
});
@@ -494,18 +509,22 @@ export class OAuth2ProviderService {
(async (): Promise<OmitFirstElement<Parameters<typeof done>>> => {
console.log('HIT /oauth/authorize validation middleware');
// Find client information from the remote.
const clientUrl = validateClientId(clientId);
const redirectUrl = new URL(redirectUri);
// https://indieauth.spec.indieweb.org/#authorization-request
// Allow same-origin redirection
if (redirectUrl.protocol !== clientUrl.protocol || redirectUrl.host !== clientUrl.host) {
// TODO: allow only explicit redirect_uri by Client Information Discovery
throw new Error('cross-origin redirect_uri is not supported yet.');
if (process.env.NODE_ENV !== 'test') {
const lookup = await dns.lookup(clientUrl.hostname);
if (ipaddr.parse(lookup.address).range() === 'loopback') {
throw new Error('client_id unexpectedly resolves to loopback IP.');
}
}
return [clientId, redirectUri];
// Find client information from the remote.
const clientInfo = await discoverClientInformation(this.httpRequestService, clientUrl.href);
if (!clientInfo.redirectUris.includes(redirectUri)) {
throw new Error('Invalid redirect_uri');
}
return [clientInfo, redirectUri];
})().then(args => done(null, ...args), err => done(err));
}));
// for (const middleware of this.#server.decision()) {

2
packages/backend/src/server/web/views/oauth.pug
View File

@@ -5,5 +5,5 @@ block meta
//- user navigates away via the navigation bar
//- XXX: Remove navigation bar in auth page?
meta(name='misskey:oauth:transaction-id' content=transactionId)
meta(name='misskey:oauth:client-id' content=clientId)
meta(name='misskey:oauth:client-name' content=clientName)
meta(name='misskey:oauth:scope' content=scope)

79
packages/backend/test/e2e/oauth.ts
View File

@@ -1,11 +1,12 @@
process.env.NODE_ENV = 'test';
import * as assert from 'assert';
import { port, relativeFetch, signup, startServer } from '../utils.js';
import type { INestApplicationContext } from '@nestjs/common';
import { AuthorizationCode } from 'simple-oauth2';
import pkceChallenge from 'pkce-challenge';
import { JSDOM } from 'jsdom';
import { port, relativeFetch, signup, startServer } from '../utils.js';
import type { INestApplicationContext } from '@nestjs/common';
import Fastify, { type FastifyInstance } from 'fastify';
const host = `http://127.0.0.1:${port}`;
@@ -28,9 +29,12 @@ function getClient(): AuthorizationCode<'client_id'> {
});
}
function getTransactionId(html: string): string | undefined {
function getMeta(html: string): { transactionId: string | undefined, clientName: string | undefined } | undefined {
const fragment = JSDOM.fragment(html);
return fragment.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:transaction-id"]')?.content;
return {
transactionId: fragment.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:transaction-id"]')?.content,
clientName: fragment.querySelector<HTMLMetaElement>('meta[name="misskey:oauth:client-name"]')?.content,
};
}
function fetchDecision(cookie: string, transactionId: string, user: any, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
@@ -51,24 +55,35 @@ function fetchDecision(cookie: string, transactionId: string, user: any, { cance
async function fetchDecisionFromResponse(response: Response, user: any, { cancel }: { cancel?: boolean } = {}): Promise<Response> {
const cookie = response.headers.get('set-cookie');
const transactionId = getTransactionId(await response.text());
const { transactionId } = getMeta(await response.text());
return await fetchDecision(cookie!, transactionId!, user, { cancel });
}
describe('OAuth', () => {
let app: INestApplicationContext;
let fastify: FastifyInstance;
let alice: any;
beforeAll(async () => {
app = await startServer();
fastify = Fastify();
fastify.get('/', async (request, reply) => {
reply.send(`
<!DOCTYPE html>
<link rel="redirect_uri" href="/redirect" />
<div class="h-app"><div class="p-name">Misklient
`);
});
fastify.listen({ port: clientPort, host: '0.0.0.0' });
alice = await signup({ username: 'alice' });
// fastify = Fastify();
}, 1000 * 60 * 2);
afterAll(async () => {
await app.close();
await fastify.close();
});
test('Full flow', async () => {
@@ -87,10 +102,11 @@ describe('OAuth', () => {
const cookie = response.headers.get('set-cookie');
assert.ok(cookie?.startsWith('connect.sid='));
const transactionId = getTransactionId(await response.text());
assert.strictEqual(typeof transactionId, 'string');
const meta = getMeta(await response.text());
assert.strictEqual(typeof meta.transactionId, 'string');
assert.strictEqual(meta?.clientName, 'Misklient');
const decisionResponse = await fetchDecision(cookie!, transactionId!, alice);
const decisionResponse = await fetchDecision(cookie!, meta.transactionId!, alice);
assert.strictEqual(decisionResponse.status, 302);
assert.ok(decisionResponse.headers.has('location'));
@@ -468,6 +484,20 @@ describe('OAuth', () => {
assert.strictEqual(response.status, 500);
});
test('Invalid redirect_uri including the valid one at authorization endpoint', async () => {
const client = getClient();
const response = await fetch(client.authorizeURL({
redirect_uri: 'http://127.0.0.1/redirection',
scope: 'write:notes',
state: 'state',
code_challenge: 'code',
code_challenge_method: 'S256',
}));
// TODO: status code
assert.strictEqual(response.status, 500);
});
test('No redirect_uri at authorization endpoint', async () => {
const client = getClient();
@@ -508,6 +538,33 @@ describe('OAuth', () => {
}));
});
test('Invalid redirect_uri including the valid one at token endpoint', async () => {
const { code_challenge, code_verifier } = pkceChallenge.default(128);
const client = getClient();
const response = await fetch(client.authorizeURL({
redirect_uri,
scope: 'write:notes',
state: 'state',
code_challenge,
code_challenge_method: 'S256',
}));
assert.strictEqual(response.status, 200);
const decisionResponse = await fetchDecisionFromResponse(response, alice);
assert.strictEqual(decisionResponse.status, 302);
const location = new URL(decisionResponse.headers.get('location')!);
assert.ok(location.searchParams.has('code'));
await assert.rejects(client.getToken({
code: location.searchParams.get('code')!,
redirect_uri: 'http://127.0.0.1/redirection',
code_verifier,
}));
});
test('No redirect_uri at token endpoint', async () => {
const { code_challenge, code_verifier } = pkceChallenge.default(128);
@@ -533,8 +590,6 @@ describe('OAuth', () => {
code_verifier,
}));
});
// TODO: disallow random same-origin URLs with strict redirect_uris with client information discovery
});
test('Server metadata', async () => {
@@ -550,5 +605,5 @@ describe('OAuth', () => {
// TODO: Error format required by OAuth spec
// TODO: Client Information Discovery
// TODO: Client Information Discovery (use http header, loopback check, missing name or redirection uri)
});