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"Origin locked" cookie prefix - draft-ietf-httpbis-rfc6265bis-06

Paolo Argentieri <paolo.argentieri@laserfiche.com> Mon, 07 September 2020 07:18 UTC

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From: Paolo Argentieri <paolo.argentieri@laserfiche.com>
To: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Thread-Topic: "Origin locked" cookie prefix - draft-ietf-httpbis-rfc6265bis-06
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Date: Sat, 05 Sep 2020 02:44:18 +0000
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Subject: "Origin locked" cookie prefix - draft-ietf-httpbis-rfc6265bis-06
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Hi all, first post here.

I'd like to propose a new "__Origin-" cookie prefix with "origin locked" semantic.
While it is possible to implement these cookies today, standardized user agent support would add a layer of optimization and security.

The cookie name begins with prefix "__Origin-" followed by the domain that served the parent page (the origin) and, optionally, a name postfix. Example:

Set-Cookie: __Origin-apps.contoso.com-accessToken=12345; Secure; HttpOnly; SameSite=None

A conformant user agent would ensure that the cookie will have been set with a "Secure" attribute and the domain following "__Origin-" matches the request Origin.
In addition, a conformant user agent would not send an "__Origin-" cookie if the domain in the cookie name does not match the Origin, excluding port.

A server should ignore "__Origin-"  cookies whose name doesn't match the Origin request header. This combination yields cookies that are pinned to a specific origin thus well suited to roundtrip session ids or JWTs (immune to XSS session hijacking attack).

Regards,
Paolo Argentieri

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