fetch() "no-cors": cross-origin to same-origin redirect taints response #737

annevk · 2018-05-25T12:49:50Z

Although per step 5 of main fetch https://fetch.spec.whatwg.org/#main-fetch if you're on a same-origin URL again after a redirect the tainting gets reset to "basic", that doesn't appear to happen in implementations.

At least for fetch() they'll taint once you go cross-origin.

I don't think they're consistent in that however as cross-origin to same-origin for images will allow image data extraction.

I guess this requires more research.

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domfarolino · 2018-05-27T06:47:21Z

Interesting; Chrome is indeed one of the violators of not resetting tainting back to "basic" after a fetch() lands on same-origin after cross-origin redirect, but that's a simple fix. Are you considering a spec change here depending on what implementations are doing?

annevk · 2018-05-28T08:42:54Z

I was initially, but I'm wondering if what browsers do here is preferable, since even though you can read such responses as the result of navigation (<iframe>) or image loads, that doesn't allow you to read the bytes of all such responses (e.g., a PDF).

So I think we probably want to keep this restriction intact where we can (and break it for navigation, images, scripts?, ?).

wanderview · 2018-05-29T14:21:53Z

I think we should avoid reseting back to basic tainting where we can. This is consistent with how cors requests can never become same-origin again once they cross an origin boundary. It would be a bit unexpected to me to make no-cors less restrictive.

annevk · 2018-05-29T16:40:07Z

I think I added the reset because of <img> and the way <iframe> works (which is "navigate", not "no-cors"). And because I was sloppy I didn't test fetch() I guess. I'm not entirely sure yet how to fix this, but I agree with you on the desirable outcome.

domfarolino · 2018-05-29T20:15:36Z

(Whoops, this slipped through the cracks in my email). I agree with this as well here, and think we should avoid resetting back to basic tainting.

youennf · 2018-05-30T03:19:06Z

+1 to not resetting tainting.
I haven't tested it on WebKit but if we are resetting tainting in some cases like canvas, this is probably a bug.

This is discussed at whatwg/fetch#737, but currently implementors have a somewhat consistent behavior. I will update the test if we change the behavior.

yutakahirano · 2018-08-20T08:07:38Z

Hi, I'm going to add a test because I was about to change the behavior without noticing this issue. I don't have a strong opinion whether we should reset tainting, but I strongly want to have a consistent behavior across fetch() and other initiators.

yutakahirano · 2018-08-20T08:07:51Z

The test is here. web-platform-tests/wpt#12566

…gin (web-platform-tests#12566) This is discussed at whatwg/fetch#737, but currently implementors have a somewhat consistent behavior. I will update the test if we change the behavior.

…gin (#12566) This is discussed at whatwg/fetch#737, but currently implementors have a somewhat consistent behavior. I will update the test if we change the behavior.

…ting back to the original origin, a=testonly Automatic update from web-platform-testsAdd tests for cross-origin redirects getting back to the original origin (#12566) This is discussed at whatwg/fetch#737, but currently implementors have a somewhat consistent behavior. I will update the test if we change the behavior. -- wpt-commits: c5400eeca28ce5b1dd10d442f0c39a6274d8522d wpt-pr: 12566

This also addresses #737 in that now A -> B -> A would be considered cross-origin even for "no-cors", but leaving that open for further plumbing in HTML et al to override that in select cases (e.g., <img>). Fixes #756.

annevk · 2018-11-16T13:51:00Z

I created a fix for this for Fetch that I think we should land unless it has a bug I didn't see: #834.

However, A -> B -> A is considered same-origin for <img>, <script>, and similar such contexts and we'll need to make sure that's defined properly there (by having HTML poke into the opaque response) and tested.

I'll leave this issue open until that's fully taken care of.

Hope that seems reasonable to everyone.

youennf · 2018-11-16T15:47:58Z

In WebKit, there is no specific handling for img or script with that regards.
I would believe A->B->A would end up being considered cross origin.
I'll check that further.

annevk · 2018-11-16T15:50:37Z

That sounds exciting, though for <img> a workaround would likely be to use <iframe> which I'm 99% sure on only considers the final response for origin comparisons.

youennf · 2018-11-17T06:14:35Z

Uploaded a test in web-platform-tests/wpt#14112
According that test, Firefox and Chrome do treat A->B->A image as same origin while Safari does not. Not sure about Edge.
It might be worth authoring a similar test for scripts and stylesheets.

That sounds exciting, though for <img> a workaround would likely be to use <iframe> which I'm 99% sure on only considers the final response for origin comparisons.

You are probably right, we probably only consider final URLs for iframes origin checks.

This also addresses #737 in that now A -> B -> A would be considered cross-origin even for "no-cors", but leaving that open to discuss whether HTML et al need to override that in select cases (e.g., <img>). Fixes #756.

domfarolino · 2018-11-23T02:07:31Z

Was looking at https://html.spec.whatwg.org/multipage/canvas.html#drawing-images:the-image-argument-is-not-origin-clean which sets a CanvasRenderingContext2D's origin-clean flag to false if image is not origin-clean; it seems like the only criteria considered when determining whether or not an image is not origin-clean is the image's origin with respect to that of the entry settings object.

I think that the origin of an image that undergoes A->B->A redirects will be same-origin with that of the entry settings object, even though the response is CORS-cross-origin. It seems if we want the behavior that @youennf's test proposes, we'd have to make the definition of is not origin-clean also consider whether image's origin is CORS-cross-origin right, similarly to what we do muted errors? (As opposed to what we thought before, where HTML would have to be updated after #834 to allow reading this data from a canvas if desirable)

annevk · 2018-11-23T09:19:37Z

Yeah, the current definition is wrong, it also doesn't match what browsers do when document.domain is involved, see https://www.w3.org/Bugs/Public/show_bug.cgi?id=28374. I forgot that either way we're gonna have to change HTML.

yutakahirano · 2018-12-05T07:25:46Z

I accidentally changed Chromium behavior months ago, and it's aligned with the new spec. I've had no complaints so far, so I'm leaning to just accepting the new behavior without having an experiment for compatibility.

Helps with whatwg/fetch#737.

This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f

This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Matt Falkenhagen <falken@chromium.org> Cr-Commit-Position: refs/heads/master@{#615475}

mfalken · 2018-12-11T12:41:59Z

I added A->B->A tests for stylesheets in web-platform-tests/wpt#14452. It looks like Chrome and Firefox currently fail it, but I'm working on changing Chrome to pass it at https://chromium-review.googlesource.com/c/chromium/src/+/1367331 (will send a Blink Intent to Ship shortly).

Use ResourceResponse::ResponseUrl() to set the base URL, and use ResponseResponse::GetType() to determine whether the resonse is CORS-same-origin. This CL has three web-exposed changes. 1. Use the response URL rather than the last request URL as the base URL of the stylesheet. This aligns with the standard. See whatwg/fetch#146 and WPT results indicate Firefox, Edge, and Safari use the response URL. This only matters if the response came from a service worker, as the URLs only differ when the service worker intercepts the request and responds with a different URL via respondWith(fetch(other_url)). This is covered by the WPT: service-workers/service-worker/fetch-request-css-base-url.https.html The test doesn't completely pass yet because the search query part of the URL gets chopped off for FetchEvent.request.referrer, but the base URL is correct. Chrome Status: https://www.chromestatus.com/feature/5642183499579392 2. Consider A->B->A redirects to be cross-origin rather than same-origin. Previously, this was considered same-origin. See the discussion in whatwg/fetch#737 and change whatwg/fetch#834. This change makes the following WPT test pass: css/cssom/stylesheet-same-origin.sub.html It also affects the web test: http/tests/security/cannot-read-cssrules-redirect.html This test is updated to match the behavior change. It can be removed later since it is redundant with the WPT test. 3. Consider load failures to be cross-origin rather than same-origin. That is, accessing |styleSheet.rules| throws a SecurityError if the load failed. This aligns with the specification: - cssRules checks the `origin-clean` flag: https://drafts.csswg.org/cssom/#dom-cssstylesheet-cssrules - This is set to true iff CORS-same-origin: https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet - CORS-same-origin is false on kError: https://html.spec.whatwg.org/multipage/urls-and-fetching.html#cors-same-origin This change makes the following WPT test pass: css/cssom/stylesheet-same-origin.sub.html It also affects the web tests: register-bypassing-scheme-partial.html require-sri-for-style-blocked.php These tests are updated to match the behavior change. Chrome Status: https://www.chromestatus.com/feature/5642183499579392 Intent to Ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/7OSy00oxVpk/siufiQVBBwAJ Bug: 911974 Change-Id: I9add3162596963eee66f60f339cfd9911bc151cd Reviewed-on: https://chromium-review.googlesource.com/c/1367331 Commit-Queue: Joel Hockey <joelhockey@chromium.org> Reviewed-by: Joel Hockey <joelhockey@chromium.org> Reviewed-by: Rune Lillesveen <futhark@chromium.org> Reviewed-by: Mike West <mkwst@chromium.org> Cr-Commit-Position: refs/heads/master@{#616580}

…ipts, a=testonly Automatic update from web-platform-tests Add muted error tests for redirected scripts Helps with whatwg/fetch#737. -- wpt-commits: 18bb80e6e1254b36db6467fdd1aa1e9e7748bb58 wpt-pr: 14218

…s., a=testonly Automatic update from web-platform-tests WPT: CSS: Add cross-origin redirect tests. This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Matt Falkenhagen <falken@chromium.org> Cr-Commit-Position: refs/heads/master@{#615475} -- wpt-commits: 600dd6cb4295d0bcfc867b8877287d485d3b0e4e wpt-pr: 14452

…ipts, a=testonly Automatic update from web-platform-tests Add muted error tests for redirected scripts Helps with whatwg/fetch#737. -- wpt-commits: 18bb80e6e1254b36db6467fdd1aa1e9e7748bb58 wpt-pr: 14218

…s., a=testonly Automatic update from web-platform-tests WPT: CSS: Add cross-origin redirect tests. This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Matt Falkenhagen <falken@chromium.org> Cr-Commit-Position: refs/heads/master@{#615475} -- wpt-commits: 600dd6cb4295d0bcfc867b8877287d485d3b0e4e wpt-pr: 14452

…ting back to the original origin, a=testonly Automatic update from web-platform-testsAdd tests for cross-origin redirects getting back to the original origin (#12566) This is discussed at whatwg/fetch#737, but currently implementors have a somewhat consistent behavior. I will update the test if we change the behavior. -- wpt-commits: c5400eeca28ce5b1dd10d442f0c39a6274d8522d wpt-pr: 12566 UltraBlame original commit: b17979968e272b9e46c009a8cdbba327f0885f0a

…ipts, a=testonly Automatic update from web-platform-tests Add muted error tests for redirected scripts Helps with whatwg/fetch#737. -- wpt-commits: 18bb80e6e1254b36db6467fdd1aa1e9e7748bb58 wpt-pr: 14218 UltraBlame original commit: d1852804c36e57cb123dc6a336c58e986e16e02f

…s., a=testonly Automatic update from web-platform-tests WPT: CSS: Add cross-origin redirect tests. This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futharkchromium.org> Commit-Queue: Matt Falkenhagen <falkenchromium.org> Cr-Commit-Position: refs/heads/master{#615475} -- wpt-commits: 600dd6cb4295d0bcfc867b8877287d485d3b0e4e wpt-pr: 14452 UltraBlame original commit: 004e8fbaeead9b556d1972586b1a17e7647b09e8

…ipts, a=testonly Automatic update from web-platform-tests Add muted error tests for redirected scripts Helps with whatwg/fetch#737. -- wpt-commits: 18bb80e6e1254b36db6467fdd1aa1e9e7748bb58 wpt-pr: 14218 UltraBlame original commit: d1852804c36e57cb123dc6a336c58e986e16e02f

…s., a=testonly Automatic update from web-platform-tests WPT: CSS: Add cross-origin redirect tests. This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futharkchromium.org> Commit-Queue: Matt Falkenhagen <falkenchromium.org> Cr-Commit-Position: refs/heads/master{#615475} -- wpt-commits: 600dd6cb4295d0bcfc867b8877287d485d3b0e4e wpt-pr: 14452 UltraBlame original commit: 004e8fbaeead9b556d1972586b1a17e7647b09e8

…ipts, a=testonly Automatic update from web-platform-tests Add muted error tests for redirected scripts Helps with whatwg/fetch#737. -- wpt-commits: 18bb80e6e1254b36db6467fdd1aa1e9e7748bb58 wpt-pr: 14218 UltraBlame original commit: d1852804c36e57cb123dc6a336c58e986e16e02f

…s., a=testonly Automatic update from web-platform-tests WPT: CSS: Add cross-origin redirect tests. This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futharkchromium.org> Commit-Queue: Matt Falkenhagen <falkenchromium.org> Cr-Commit-Position: refs/heads/master{#615475} -- wpt-commits: 600dd6cb4295d0bcfc867b8877287d485d3b0e4e wpt-pr: 14452 UltraBlame original commit: 004e8fbaeead9b556d1972586b1a17e7647b09e8

karendolan · 2020-09-15T00:42:49Z

Hi, is there a way to tell if Safari 13 is able to past the test written for this https://github.com/web-platform-tests/wpt/pull/14112/files?

yutakahirano · 2020-09-17T02:53:01Z

If you have a device running Safari 13 you can visit http://wpt.live/fetch/images/canvas-remote-read-remote-image-redirect.html.

https://wpt.fyi/results/fetch/images/canvas-remote-read-remote-image-redirect.html?label=experimental&label=master&aligned
has a result for "Safari 113 preview macOS 10.15".

This adds tests that stylesheets that result from requests that were redirected cross-origin are considered cross-origin. Note that A->B->A redirects, which redirect from cross-origin to same-origin, are considered cross-origin. See whatwg/fetch#737 and whatwg/fetch#834. In Blink, we have redirect tests at http/tests/security/cannot-read-cssrules-redirect.html. This WPT addition will supersede that test, but I won't yet remove it since it asserts the opposite for the A->B->A case. I can remove the test when Blink changes to pass this WPT test. Bug: 911974 Change-Id: Ie015c0390829299de7c29cff6685ddfcd774c66f Reviewed-on: https://chromium-review.googlesource.com/c/1370162 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Matt Falkenhagen <falken@chromium.org> Cr-Commit-Position: refs/heads/master@{#615475} Former-commit-id: 02d7d52f7396cb7a5e17c83e1da77fb4877047f7

Use ResourceResponse::ResponseUrl() to set the base URL, and use ResponseResponse::GetType() to determine whether the resonse is CORS-same-origin. This CL has three web-exposed changes. 1. Use the response URL rather than the last request URL as the base URL of the stylesheet. This aligns with the standard. See whatwg/fetch#146 and WPT results indicate Firefox, Edge, and Safari use the response URL. This only matters if the response came from a service worker, as the URLs only differ when the service worker intercepts the request and responds with a different URL via respondWith(fetch(other_url)). This is covered by the WPT: service-workers/service-worker/fetch-request-css-base-url.https.html The test doesn't completely pass yet because the search query part of the URL gets chopped off for FetchEvent.request.referrer, but the base URL is correct. Chrome Status: https://www.chromestatus.com/feature/5642183499579392 2. Consider A->B->A redirects to be cross-origin rather than same-origin. Previously, this was considered same-origin. See the discussion in whatwg/fetch#737 and change whatwg/fetch#834. This change makes the following WPT test pass: css/cssom/stylesheet-same-origin.sub.html It also affects the web test: http/tests/security/cannot-read-cssrules-redirect.html This test is updated to match the behavior change. It can be removed later since it is redundant with the WPT test. 3. Consider load failures to be cross-origin rather than same-origin. That is, accessing |styleSheet.rules| throws a SecurityError if the load failed. This aligns with the specification: - cssRules checks the `origin-clean` flag: https://drafts.csswg.org/cssom/#dom-cssstylesheet-cssrules - This is set to true iff CORS-same-origin: https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet - CORS-same-origin is false on kError: https://html.spec.whatwg.org/multipage/urls-and-fetching.html#cors-same-origin This change makes the following WPT test pass: css/cssom/stylesheet-same-origin.sub.html It also affects the web tests: register-bypassing-scheme-partial.html require-sri-for-style-blocked.php These tests are updated to match the behavior change. Chrome Status: https://www.chromestatus.com/feature/5642183499579392 Intent to Ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/7OSy00oxVpk/siufiQVBBwAJ Bug: 911974 Change-Id: I9add3162596963eee66f60f339cfd9911bc151cd Reviewed-on: https://chromium-review.googlesource.com/c/1367331 Commit-Queue: Joel Hockey <joelhockey@chromium.org> Reviewed-by: Joel Hockey <joelhockey@chromium.org> Reviewed-by: Rune Lillesveen <futhark@chromium.org> Reviewed-by: Mike West <mkwst@chromium.org> Cr-Commit-Position: refs/heads/master@{#616580} Former-commit-id: 8b30f526e1c760773511f48faa80c0347e49234c

annevk added the security/privacy There are security or privacy implications label May 25, 2018

annevk mentioned this issue Jun 6, 2018

Request's tainted origin flag fallout #756

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yutakahirano mentioned this issue Aug 20, 2018

Add tests for cross-origin redirects getting back to the original origin web-platform-tests/wpt#12566

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annevk mentioned this issue Nov 16, 2018

Take tainted origin flag into account for the same origin check #834

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annevk added the topic: html label Nov 16, 2018

annevk mentioned this issue Nov 20, 2018

Load an image with redirect: initially same-origin, it is redirected to a cross origin URL which redirects to the first origin. web-platform-tests/wpt#14112

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annevk mentioned this issue Nov 26, 2018

Add muted error tests for redirected scripts web-platform-tests/wpt#14218

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annevk pushed a commit to web-platform-tests/wpt that referenced this issue Dec 10, 2018

Add muted error tests for redirected scripts

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Helps with whatwg/fetch#737.

chromium-wpt-export-bot mentioned this issue Dec 11, 2018

WPT: CSS: Add cross-origin redirect tests. web-platform-tests/wpt#14452

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annevk added the topic: redirects label Sep 17, 2019

mfalken mentioned this issue Oct 19, 2020

First draft of prerendering browsing context WICG/nav-speculation#5

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fetch() "no-cors": cross-origin to same-origin redirect taints response #737

fetch() "no-cors": cross-origin to same-origin redirect taints response #737

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fetch() "no-cors": cross-origin to same-origin redirect taints response #737

fetch() "no-cors": cross-origin to same-origin redirect taints response #737

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