Webkit 的「反追蹤反追蹤」功能...

第一次看到標題的時候的確是 WTF 的感覺,愈來愈感覺到大戰的開始:「Preventing Tracking Prevention Tracking」。

在蘋果的平台上有 Intelligent Tracking Prevention (ITP) 功能,但先前這個功能比較簡單,所以還是有很多地方可以被當作 browser fingerprint 的一部份分析,所以蘋果決定改善,然後在新版的軟體裡引入:

This blog post covers enhancements to Intelligent Tracking Prevention (ITP) included in Safari on iOS and iPadOS 13.3, Safari 13.0.4 on macOS Catalina, Mojave, and High Sierra.

包括了跨站台時 Referer 的省略:

ITP now downgrades all cross-site request referrer headers to just the page’s origin. Previously, this was only done for cross-site requests to classified domains.

然後後面三個改善都跟 3rd-party cookie 有關,其中預設擋掉帶 cookie 的 3rd-party requests 應該會讓一些網站掛掉:

ITP will now block all third-party requests from seeing their cookies, regardless of the classification status of the third-party domain, unless the first-party website has already received user interaction.

早期自己做自家 SSO 的奇技淫巧中,會設計出透過 ajax 打多個不同的網域自動登入,看起來應該會需要檢查了...

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