server: add wildcard matching to blocked hosts

This adds in wildcard matching. For instance:
- `*.bad.tld` will match: `very.bad.tld`
- `bad.*` will match: `bad.something`
- `*.bad.*` will match: `very.bad.evil`

Changelog: Changed

locales/en-US.yml

@@ -187,7 +187,7 @@ clearCachedFiles: "Clear cache"
 clearCachedFilesConfirm: "Are you sure that you want to delete all cached remote files?"
 blockedInstances: "Blocked Instances"
 blockedInstancesDescription: "List the hostnames of the instances that you want to\
-  \ block. Listed instances will no longer be able to communicate with this instance."
+  \ block. Listed instances will no longer be able to communicate with this instance. You can use an asterisk (*) as a placeholder for zero or more character(s)."
 muteAndBlock: "Mutes and Blocks"
 mutedUsers: "Muted users"
 blockedUsers: "Blocked users"

packages/backend/src/misc/skipped-instances.ts

@@ -1,7 +1,5 @@
-import { Brackets } from 'typeorm';
 import { db } from '@/db/postgre.js';
 import { fetchMeta } from '@/misc/fetch-meta.js';
-import { Instances } from '@/models/index.js';
 import { Instance } from '@/models/entities/instance.js';
 import { DAY } from '@/const.js';
 
@@ -9,17 +7,40 @@ import { DAY } from '@/const.js';
 // "dead" and should no longer get activities delivered to it.
 const deadThreshold = 7 * DAY;
 
+/**
+ * Returns whether a given host matches a wildcard pattern.
+ * @param host punycoded instance host
+ * @param pattern wildcard pattern containing a punycoded instance host
+ * @returns whether the post matches the pattern
+ */
+function matchHost(host: Instance['host'], pattern: string): boolean {
+	// Escape all of the regex special characters. Pattern from:
+	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
+	const escape = (str: string): string => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+
+	const re = new RegExp('^' + pattern.split('*').map(escape).join('.*') + '$');
+	return re.test(host);
+}
+
+/**
+ * Returns whether a specific host (punycoded) should be blocked.
+ *
+ * @param host punycoded instance host
+ * @returns whether the given host should be blocked
+ */
+export async function shouldBlockInstance(host: string): Promise<boolean> {
+	const { blockedHosts } = await fetchMeta();
+	return blockedHosts.some(blockedHost => matchHost(host, blockedHost));
+}
+
 /**
  * Returns the subset of hosts which should be skipped.
  * 
  * @param hosts array of punycoded instance hosts
- * @returns array of punycoed instance hosts that should be skipped (subset of hosts parameter)
+ * @returns array of punycoded instance hosts that should be skipped (subset of hosts parameter)
  */
-export async function skippedInstances(hosts: Array<Instace['host']>): Array<Instance['host']> {
-	// first check for blocked instances since that info may already be in memory
-	const { blockedHosts } = await fetchMeta();
-
-	const skipped = hosts.filter(host => blockedHosts.includes(host));
+export async function skippedInstances(hosts: Array<Instance['host']>): Promise<Array<Instance['host']>> {
+	const skipped = hosts.filter(host => shouldBlockInstance(host));
 	// if possible return early and skip accessing the database
 	if (skipped.length === hosts.length) return hosts;
 
@@ -32,10 +53,10 @@ export async function skippedInstances(hosts: Array<Instace['host']>): Array<Ins
 				deadTime.toISOString(),
 				// don't check hosts again that we already know are suspended
 				// also avoids adding duplicates to the list
-				hosts.filter(host => !skipped.includes(host) && !host.includes(',')).join(','),
+				hosts.filter(host => !skipped.some(blockedHost => matchHost(host, blockedHost)) && !host.includes(',')).join(','),
 			],
 		)
-		.then(res => res.map(row => row.host))
+		.then(res => res.map(row => row.host)),
 	);
 }
 
@@ -47,7 +68,7 @@ export async function skippedInstances(hosts: Array<Instace['host']>): Array<Ins
  * @param host punycoded instance host
  * @returns whether the given host should be skipped
  */
-export async function shouldSkipInstance(host: Instance['host']): boolean {
+export async function shouldSkipInstance(host: Instance['host']): Promise<boolean> {
 	const skipped = await skippedInstances([host]);
 	return skipped.length > 0;
 }

packages/backend/src/queue/processors/inbox.ts

@@ -6,7 +6,6 @@ import Logger from '@/services/logger.js';
 import { registerOrFetchInstanceDoc } from '@/services/register-or-fetch-instance-doc.js';
 import { Instances } from '@/models/index.js';
 import { apRequestChart, federationChart, instanceChart } from '@/services/chart/index.js';
-import { fetchMeta } from '@/misc/fetch-meta.js';
 import { toPuny, extractDbHost } from '@/misc/convert-host.js';
 import { getApId } from '@/remote/activitypub/type.js';
 import { fetchInstanceMetadata } from '@/services/fetch-instance-metadata.js';
@@ -17,6 +16,7 @@ import { StatusError } from '@/misc/fetch.js';
 import { CacheableRemoteUser } from '@/models/entities/user.js';
 import { UserPublickey } from '@/models/entities/user-publickey.js';
 import { InboxJobData } from '@/queue/types.js';
+import { shouldBlockInstance } from '@/misc/skipped-instances.js';
 
 const logger = new Logger('inbox');
 
@@ -33,9 +33,8 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 
 	const host = toPuny(new URL(signature.keyId).hostname);
 
-	// ブロックしてたら中断
-	const meta = await fetchMeta();
-	if (meta.blockedHosts.includes(host)) {
+	// Stop if the host is blocked.
+	if (await shouldBlockInstance(host)) {
 		return `Blocked request: ${host}`;
 	}
 
@@ -117,9 +116,9 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 				return `skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`;
 			}
 
-			// ブロックしてたら中断
+			// Stop if the host is blocked.
 			const ldHost = extractDbHost(authUser.user.uri);
-			if (meta.blockedHosts.includes(ldHost)) {
+			if (await shouldBlockInstance(ldHost)) {
 				return `Blocked request: ${ldHost}`;
 			}
 		} else {

packages/backend/src/remote/activitypub/resolver.ts

@@ -12,6 +12,7 @@ import renderQuestion from '@/remote/activitypub/renderer/question.js';
 import renderCreate from '@/remote/activitypub/renderer/create.js';
 import { renderActivity } from '@/remote/activitypub/renderer/index.js';
 import renderFollow from '@/remote/activitypub/renderer/follow.js';
+import { shouldBlockInstance } from '@/misc/skipped-instances.js';
 import { signedGet } from './request.js';
 import { IObject, isCollectionOrOrderedCollection, ICollection, IOrderedCollection } from './type.js';
 import { parseUri } from './db-resolver.js';
@@ -67,8 +68,7 @@ export default class Resolver {
 			return await this.resolveLocal(value);
 		}
 
-		const meta = await fetchMeta();
-		if (meta.blockedHosts.includes(host)) {
+		if (await shouldBlockInstance(host)) {
 			throw new Error('Instance is blocked');
 		}
 

packages/backend/src/server/api/endpoints/ap/show.ts

@@ -1,4 +1,3 @@
-import config from '@/config/index.js';
 import { createPerson } from '@/remote/activitypub/models/person.js';
 import { createNote } from '@/remote/activitypub/models/note.js';
 import DbResolver from '@/remote/activitypub/db-resolver.js';
@@ -7,10 +6,10 @@ import { extractDbHost } from '@/misc/convert-host.js';
 import { Users, Notes } from '@/models/index.js';
 import { Note } from '@/models/entities/note.js';
 import { CacheableLocalUser, User } from '@/models/entities/user.js';
-import { fetchMeta } from '@/misc/fetch-meta.js';
 import { isActor, isPost, getApId } from '@/remote/activitypub/type.js';
 import { SchemaType } from '@/misc/schema.js';
 import { HOUR } from '@/const.js';
+import { shouldBlockInstance } from '@/misc/skipped-instances.js';
 import define from '../../define.js';
 import { ApiError } from '../../error.js';
 
@@ -85,9 +84,11 @@ export default define(meta, paramDef, async (ps, me) => {
  * URIからUserかNoteを解決する
  */
 async function fetchAny(uri: string, me: CacheableLocalUser | null | undefined): Promise<SchemaType<typeof meta['res']> | null> {
-	// ブロックしてたら中断
-	const fetchedMeta = await fetchMeta();
-	if (fetchedMeta.blockedHosts.includes(extractDbHost(uri))) return null;
+	// Stop if the host is blocked.
+	const host = extractDbHost(uri);
+	if (await shouldBlockInstance(host)) {
+		return null;
+	}
 
 	const dbResolver = new DbResolver();