1550032 - Change cookie API to explicitly support sameSite=none

Status: RESOLVED FIXED

(WebExtensions :: General, enhancement, P3)

Description

[Mike Conca [:mconca]]

Google intends to update the cookie API to explicitly support the SameSite=None value of the attribute, as well as change the meaning of the default when no SameSite attribute is specified, adding a new 'unspecified' value.

See https://groups.google.com/a/chromium.org/forum/#!topic/chromium-extensions/rwjZcCnlITo

The Firefox WebExtensions API for cookies should be modified to match this change.

Comment 1

[Rob Wu [:robwu]]

This requires platform support.

Here are relevant resources about the development of SameSite=None

• https://github.com/httpwg/http-extensions/commit/fa624b1358be1ef77a4fd2560c94593ecf7f508d
• SameSite=None https://bugs.chromium.org/p/chromium/issues/detail?id=953306
• https://github.com/web-platform-tests/wpt/pull/16779

It's not clear whether Mozilla was involved in standardization discussions about this, since the dependency tree of bug 795346 has not recently been modified. SameSite=None is not the only upcoming change, Chromium also appears to be working on SameSite=Extended:

• SameSite=Extended https://bugs.chromium.org/p/chromium/issues/detail?id=953995

Comment 2

[Andrea Marchesini [:baku]]

I think this bug is a dup of 1551798. In bug 1551798 I implemented both SameSite=lax by default and SameSite=None only if secure.
SameSite=Extended should be a separate bug.

Comment 3

[Rob Wu [:robwu]]

Bug 1551798 does currently not address this bug, because it just changes the default to SAMESITE_NONE, while the extension API should default to NONE or LAX depending on the defaults (if sameSite is not set).

The change must be:

• If sameSite is set to "unspecified", do whatever the defaults are (lax or none, depending on bug 1551798)
• If sameSite not set, treat it as "unspecified" (i.e. same behavior as previous line).

Not changed, but the other cases are:

• If sameSite is set to "none", use SAMESITE_NONE
• If sameSite is set to "lax", use SAMESITE_LAX
• If sameSite is set to "strict", use SAMESITE_STRICT

Besides the above change, in order to resolve this bug a unit test must be written for the functionality.
Do you plan to do the above in bug 1551798? If not, then this bug should probably be deduplicated.

Comment 4

[Andrea Marchesini [:baku]]

I didn't realize this was about webExtensions. Reopening the bug.

Comment 5

[Rob Wu [:robwu]]

Bug 1551798 adds partial support. There is no "unspecified" keyword, but when sameSite is omitted, the preference-dependent default is chosen.

While looking at the patch, I also noticed that there is an untested issue: Previously, when sameSite was omitted, it defaulted to SameSite=Strict instead of SameSite=None (because absence of sameSite means that sameSite is -1, and -1 is converted to STRICT). This is unintentional, and apparently there is no test coverage, so I'm going to add a unit test when I resolve this bug.

Comment 7

[Anurag Akella]

Attachment: Bug 1550032 - added a test for the cookie API to explicitly support sameSite=none r?robwu

Depends on D100651

Comment 8

[Anurag Akella]

Attachment: Bug 1550032 - added a test for the cookie API to explicitly support sameSite=none r?robwu

Comment 9

[Rob Wu [:robwu]]

I'm opening this bug for other contributors since the patches have not had any activity for over 6 months.

Comment 10

[Andrea Marchesini [:baku]]

Attachment: Bug 1550032 - WebExt Cookie API - Implement sameSite=unspecified, r?robwu

Comment 11

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/948a2bfd1669
WebExt Cookie API - Implement sameSite=unspecified, r=robwu

Comment 12

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/948a2bfd1669

Comment 13

[rbloor]

Relevant updates are in

• browser compatibility data Bug-1550032 addition of unspecified to webextension.api.cookie.SameSiteStatus #26795
• MDN content Bug-1550032 addition of unspecified to webextension.api.cookie.SameSiteStatus docs #39512
• release note Bug-1550032 addition of unspecified to webextension.api.cookie.SameSiteStatus release note #39513