Bug 214293 – [SOUP] Artificial delay to WebSocket connection to mitigate port scanning attacks

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Lauro Moura]

r264306/bug213143 added an artificial delay to NetworkSocketStream when the failure to connect to a WebSocket was caused by a closed port.

Soup-based ports follow another path, with the connection failing in WebSocketTaskSoup.cpp with error SOUP_WEBSOCKET_ERROR_NOT_WEBSOCKET, not distinguishing the detail whether it was due to a closed port or not.

[Lauro Moura]

Created attachment 404212 [details]
Tentative patch

This patch adds the randomized delay for SOUP_WEBSOCKET_ERROR_NOT_WEBSOCKET. Initial testing showed no regressions in the hybi suite locally.

[Carlos Garcia Campos]

Comment on attachment 404212 [details]
Tentative patch

View in context: https://bugs.webkit.org/attachment.cgi?id=404212&action=review

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:45
> +    , m_delaySource(RunLoop::main(), this, &WebSocketTask::delayFired)

m_delaySource -> m_delayFailSource or even better m_delayFailTimer

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:68
> +            if (g_error_matches(error.get(), SOUP_WEBSOCKET_ERROR, SOUP_WEBSOCKET_ERROR_NOT_WEBSOCKET)) {

I think we can check the message status code and only do the delay if it is SOUP_STATUS_CANT_CONNECT (and maybe SOUP_STATUS_CANT_CONNECT_PROXY too).

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:69
> +                task->m_errorMessage = error->message;

task->m_errorMessage = String::fromUTF8(error->message);

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:250
> +void WebSocketTask::delayFired()

delayFailTimerFired

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:253
> +    m_delaySource.stop();

You don't need this, it's a one shot, it's already stopped at this point.

> Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.h:70
> +    String m_errorMessage;

m_delayErrorMessage

[Lauro Moura]

Created attachment 404275 [details]
Updated patch

[EWS]

Committed r264394: <https://trac.webkit.org/changeset/264394>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 404275 [details].