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some edits for comments

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This commit is contained in:
Kagami Sascha Rosylight 2023-06-16 23:07:02 +02:00
parent c55d9784fe
commit 1755c75647
1 changed files with 25 additions and 13 deletions
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38
packages/backend/src/server/oauth/OAuth2ProviderService.ts
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@ -35,14 +35,14 @@ import type { FastifyInstance } from 'fastify';
// This is also mostly similar to https://developers.google.com/identity/protocols/oauth2/web-server#uri-validation
// although Google has stricter rule.
function validateClientId(raw: string): URL {
// Clients are identified by a [URL].
// "Clients are identified by a [URL]."
const url = ((): URL => {
try {
return new URL(raw);
} catch { throw new AuthorizationError('client_id must be a valid URL', 'invalid_request'); }
})();
// Client identifier URLs MUST have either an https or http scheme
// "Client identifier URLs MUST have either an https or http scheme"
// But then again:
// https://datatracker.ietf.org/doc/html/rfc6749.html#section-3.1.2.1
// 'The redirection endpoint SHOULD require the use of TLS as described
@ -53,30 +53,30 @@ function validateClientId(raw: string): URL {
throw new AuthorizationError('client_id must be a valid HTTPS URL', 'invalid_request');
}
// MUST contain a path component (new URL() implicitly adds one)
// "MUST contain a path component (new URL() implicitly adds one)"
// MUST NOT contain single-dot or double-dot path segments,
// "MUST NOT contain single-dot or double-dot path segments,"
const segments = url.pathname.split('/');
if (segments.includes('.') || segments.includes('..')) {
throw new AuthorizationError('client_id must not contain dot path segments', 'invalid_request');
}
// (MAY contain a query string component)
// ("MAY contain a query string component")
// MUST NOT contain a fragment component
// "MUST NOT contain a fragment component"
if (url.hash) {
throw new AuthorizationError('client_id must not contain a fragment component', 'invalid_request');
}
// MUST NOT contain a username or password component
// "MUST NOT contain a username or password component"
if (url.username || url.password) {
throw new AuthorizationError('client_id must not contain a username or a password', 'invalid_request');
}
// (MAY contain a port)
// ("MAY contain a port")
// host names MUST be domain names or a loopback interface and MUST NOT be
// IPv4 or IPv6 addresses except for IPv4 127.0.0.1 or IPv6 [::1].
// "host names MUST be domain names or a loopback interface and MUST NOT be
// IPv4 or IPv6 addresses except for IPv4 127.0.0.1 or IPv6 [::1]."
if (!url.hostname.match(/\.\w+$/) && !['localhost', '127.0.0.1', '[::1]'].includes(url.hostname)) {
throw new AuthorizationError('client_id must have a domain name as a host name', 'invalid_request');
}
@ -91,6 +91,16 @@ interface ClientInformation {
}
// https://indieauth.spec.indieweb.org/#client-information-discovery
// "Authorization servers SHOULD support parsing the [h-app] Microformat from the client_id,
// and if there is an [h-app] with a url property matching the client_id URL,
// then it should use the name and icon and display them on the authorization prompt."
// (But we don't display any icon for now)
// https://indieauth.spec.indieweb.org/#redirect-url
// "The client SHOULD publish one or more <link> tags or Link HTTP headers with a rel attribute
// of redirect_uri at the client_id URL.
// Authorization endpoints verifying that a redirect_uri is allowed for use by a client MUST
// look for an exact match of the given redirect_uri in the request against the list of
// redirect_uris discovered after resolving any relative URLs."
async function discoverClientInformation(httpRequestService: HttpRequestService, id: string): Promise<ClientInformation> {
try {
const res = await httpRequestService.send(id);
@ -341,9 +351,8 @@ export class OAuth2ProviderService {
const clientUrl = validateClientId(clientID);
// TODO: Consider allowing localhost for native apps (RFC 8252)
// The current setup requires an explicit list of redirect_uris per
// https://datatracker.ietf.org/doc/html/draft-ietf-oauth-security-topics#section-4.1.3
// which blocks the support. But we could loose the rule in this case.
// This is currently blocked by the redirect_uri check below, but we can theoretically
// loosen the rule for localhost as the data never leaves the client machine.
if (process.env.NODE_ENV !== 'test' || process.env.MISSKEY_TEST_CHECK_IP_RANGE === '1') {
const lookup = await dns.lookup(clientUrl.hostname);
if (ipaddr.parse(lookup.address).range() !== 'unicast') {
@ -353,6 +362,9 @@ export class OAuth2ProviderService {
// Find client information from the remote.
const clientInfo = await discoverClientInformation(this.httpRequestService, clientUrl.href);
// Requires an explicit list of redirect_uris per
// https://datatracker.ietf.org/doc/html/draft-ietf-oauth-security-topics#section-4.1.3
if (!clientInfo.redirectUris.includes(redirectURI)) {
throw new AuthorizationError('Invalid redirect_uri', 'invalid_request');
}