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LibWeb+LibWebView+WebContent: Begin implementing simple site islotation

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Site isolation is a common technique to reduce the chance that malicious
sites can access data from other sites. When the user navigates, we now
check if the target site is the same as the current site. If not, we
instruct the UI to perform the navigation in a new WebContent process.

The phrase "site" here is defined as the public suffix of the URL plus
one level. This means that navigating from "www.example.com" to
"sub.example.com" remains in the same process.

There's plenty of room for optimization around this. For example, we can
create a spare WebContent process ahead of time to hot-swap the target
site. We can also create a policy to keep the navigated-from process
around, in case the user quickly navigates back.
This commit is contained in:
Timothy Flynn 2025-03-09 11:40:34 -04:00 • committed by Jelle Raaijmakers
commit 5810c8073e
Notes: github-actions[bot] 2025-03-11 11:11:49 +00:00
12 changed files with 94 additions and 0 deletions
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1
Libraries/LibWebView/WebContentClient.h
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@ -52,6 +52,7 @@ private:
virtual void die() override;
virtual void did_paint(u64 page_id, Gfx::IntRect, i32) override;
virtual void did_request_new_process_for_navigation(u64 page_id, URL::URL url) override;
virtual void did_finish_loading(u64 page_id, URL::URL) override;
virtual void did_request_refresh(u64 page_id) override;
virtual void did_request_cursor_change(u64 page_id, Gfx::Cursor) override;