Bug 161902 – [Fetch API] Referrer and Origin header should not be considered as safe request headers

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[youenn fablet]

As stated in https://fetch.spec.whatwg.org/#cors-safelisted-request-header, Referrer and Origin are not safe request headers.

[youenn fablet]

As per fetch, these headers are set after preflighting.

[youenn fablet]

Created attachment 288688 [details]
Patch

[Alex Christensen]

Comment on attachment 288688 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=288688&action=review

> Source/WebCore/Modules/fetch/FetchLoader.cpp:96
> +    if (referrer == "no-referrer") {

Should this be a case-insensitive comparison?

> Source/WebCore/Modules/fetch/FetchLoader.cpp:100
> +        referrer = (referrer == "client") ? context.url().strippedForUseAsReferrer() : URL(context.url(), referrer).strippedForUseAsReferrer();

ditto

[youenn fablet]

(In reply to comment #3)
> Comment on attachment 288688 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=288688&action=review
> 
> > Source/WebCore/Modules/fetch/FetchLoader.cpp:96
> > +    if (referrer == "no-referrer") {
> 
> Should this be a case-insensitive comparison?

This is not necessary.

> > Source/WebCore/Modules/fetch/FetchLoader.cpp:100
> > +        referrer = (referrer == "client") ? context.url().strippedForUseAsReferrer() : URL(context.url(), referrer).strippedForUseAsReferrer();
> 
> ditto

This is not necessary either.

"client" is a string computed within FetchRequest when given parameter is about:client or ABOUT:client. We could add a test for different "about" casing, but this is not related to this patch.

In another patch, as a small improvement, we could make fetch referrer as a structure instead of a string. That would allow to remove the need for string comparison.

[WebKit Commit Bot]

Comment on attachment 288688 [details]
Patch

Clearing flags on attachment: 288688

Committed r206009: <http://trac.webkit.org/changeset/206009>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.