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The W3 Secure Contexts specification defines additional contexts to be potentially secure beyond HTTPS, such as localhost, 127.0.0.1, and *.localhost. Therefore, by limiting secure cookies to only SSL, we are restricting session uses in additional valid contexts (which is particularly important because setting SameSite=None, which is required by cross-domain iframes, is only doable with the Secure flag). Backwards-compatibility wise this should be safe because Secure cookies were never returned outside of SSL, and now we will start to. Furthermore, if a Secure cookie is returned over a non-Secure Context, browser automatically discard them. https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts
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It would be important for a security minded person to double check this pull request. |
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If anyone was looking to blame the code to understand why it behaves like this: rack/rack@4defbe5#diff-225166a61eb70a7b8bf59f3c3283e0d6c1e95b02734ad800657117676a6d0e1bR242 😅 |
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The W3 Secure Contexts specification defines additional contexts to be potentially secure beyond HTTPS, such as localhost, 127.0.0.1, and *.localhost. Therefore, by limiting secure cookies to only SSL, we are restricting session uses in additional valid contexts (which is particularly important because setting SameSite=None, which is required by cross-domain iframes, is only doable with the Secure flag).
Backwards-compatibility wise this should be safe because Secure cookies were never returned outside of SSL, and now we will start to. Furthermore, if a Secure cookie is returned over a non-Secure Context, browser automatically discard them.
https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts