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Commit20fa9d5

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fix(devtools): Enhance message bus with event tagging and spam protection
One common problem encountered by the devtools content script is that it accepted almost any message send over the message bus. Some websites like `auth.openai.com` were spamming the bus and DDOS the devtools app.This commit introduces 2 defensives strategies :* event tagging : Only Event sent by the devtools app will make it to its backend* Bailout out when the event throughput is too high (we're getting spammed).fixes#62471#62450#55854
1 parente8c5603 commit20fa9d5

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5 files changed

+27
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5 files changed

+27
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lines changed

‎devtools/projects/shell-browser/src/app/BUILD.bazel

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@@ -186,6 +186,7 @@ ts_project(
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deps= [
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":chrome_message_bus_rjs",
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":same_page_message_bus_rjs",
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"//:node_modules/rxjs",
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"//devtools/projects/protocol:protocol_rjs",
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],
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)

‎devtools/projects/shell-browser/src/app/chrome-message-bus.ts

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@@ -74,6 +74,7 @@ export class ChromeMessageBus extends MessageBus<Events> {
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topic,
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args,
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__ignore_ng_zone__:true,
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__NG_DEVTOOLS_EVENT__:true,
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});
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returntrue;
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}

‎devtools/projects/shell-browser/src/app/content-script.ts

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@@ -8,6 +8,7 @@
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/// <reference types="chrome"/>
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import{bufferTime,fromEvent,tap}from'rxjs';
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import{ChromeMessageBus}from'./chrome-message-bus';
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import{SamePageMessageBus}from'./same-page-message-bus';
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@@ -94,7 +95,11 @@ if (!backendInitialized) {
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}
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constproxyEventFromWindowToDevToolsExtension=(event:MessageEvent)=>{
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if(event.source===window&&event.data){
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// We check for the __NG_DEVTOOLS_EVENT__ property to ensure that we only forward
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// messages that are intended for the Angular DevTools extension.
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// This prevents the content script from forwarding arbitrary messages that could
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// potentially DDOS the extension or cause other issues.
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if(event.source===window&&event.data&&event.data.__NG_DEVTOOLS_EVENT__){
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try{
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chrome.runtime.sendMessage(event.data);
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}catch(e){
@@ -111,3 +116,20 @@ const proxyEventFromWindowToDevToolsExtension = (event: MessageEvent) => {
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};
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window.addEventListener('message',proxyEventFromWindowToDevToolsExtension);
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/**
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* This introduces a spam protection mechanism for the message bus.
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*/
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fromEvent(window,'message')
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.pipe(
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bufferTime(1000),// Collect emissions for 1 second
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tap((buffer):void=>{
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if(buffer.length>100){
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window.removeEventListener('message',proxyEventFromWindowToDevToolsExtension);
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thrownewError(
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`Message stream is getting spammed - Angular extension is bailing out (${buffer.length} msgs/s)`,
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);
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}
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}),
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)
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.subscribe();

‎devtools/projects/shell-browser/src/app/same-page-message-bus.ts

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@@ -74,6 +74,7 @@ export class SamePageMessageBus extends MessageBus<Events> {
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topic,
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args,
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__ignore_ng_zone__:true,
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__NG_DEVTOOLS_EVENT__:true,
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},
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'*',
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);

‎devtools/src/iframe-message-bus.ts

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Original file line numberDiff line numberDiff line change
@@ -78,6 +78,7 @@ export class IFrameMessageBus extends MessageBus<Events> {
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// event listeners but also not prevent the NgZone in the devtools app
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// from updating its UI.
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__ignore_ng_zone__:this._source==='angular-devtools',
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__NG_DEVTOOLS_EVENT__:true,
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},
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'*',
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);

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