Add about:blank iframe referrer tests

This CL adds the following about:blank iframe "inheritance" tests: - A test ensuring that the document.referrer for about:blank iframes is set to the full uncensored URL of the creator document, regardless of its referrer policy. This is for https://crbug.com/1075729. - A test ensuring that an about:blank iframe inherits its creator document's referrer policy. This is for https://crbug.com/1075738. R=domenic@chromium.org, hiroshige@chromium.org Bug: 1075729, 1075738 Change-Id: I215e82da4c72028b2597097d2340179a70dbffc8 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2168653 Commit-Queue: Dominic Farolino <dom@chromium.org> Reviewed-by: Domenic Denicola <domenic@chromium.org> Cr-Commit-Position: refs/heads/master@{#764314}
simonwuelker · Apr 30, 2020 · f9f0aa0 · f9f0aa0
1 parent 095b529
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diff --git a/common/security-features/subresource/referrer.py b/common/security-features/subresource/referrer.py
@@ -0,0 +1,4 @@
+def main(request, response):
+    referrer = request.headers.get("referer", "")
+    response_headers = [("Content-Type", "text/javascript")];
+    return (200, response_headers, "window.referrer = '" + referrer + "'")
diff --git a/referrer-policy/generic/inheritance/iframe-inheritance-about-blank.html b/referrer-policy/generic/inheritance/iframe-inheritance-about-blank.html
@@ -0,0 +1,104 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Referrer Policy: iframe src="about:blank"</title>
+<link rel="author" title="Hiroshige Hayashizaki" href="mailto:hiroshige@chromium.org">
+<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<meta name="referrer" content="origin">
+<body>
+<script>
+const testFetchClientReferrer =
+  async_test("The fetch() API in an about:blank iframe with the 'client' " +
+             "referrer is fetched with no 'Referer' header");
+const testFetchURLReferrer =
+  async_test("The fetch() API in an about:blank iframe with a custom URL " +
+             "referrer is fetched with a 'Referer` header that uses the " +
+             "outer document's URL along with its referrer policy");
+const testDocumentReferrer =
+  async_test("The value of document.referrer in an about:blank iframe is the " +
+             "outer document's full URL, regardless of referrer policy");
+const testSubresource =
+  async_test("A subresource fetched from an about:blank iframe is fetched " +
+             "with no 'Referer' header");
+
+window.addEventListener("message", msg => {
+  const test_name = msg.data.test;
+  const referrer = msg.data.referrer;
+  if (test_name === "testFetchClientReferrer") {
+    testFetchClientReferrer.step_func_done(() => {
+      // Because the URL of the Document of <iframe src="about:blank"> is
+      // "about:blank", the stripped URL is no referrer:
+      // https://w3c.github.io/webappsec-referrer-policy/#strip-url.
+      assert_equals(referrer, undefined);
+    })();
+  } else if (test_name === "testFetchURLReferrer") {
+    // <iframe src="about:blank"> inherits its parent's referrer policy.
+    // Note: Setting an explicit URL as referrer succeeds
+    // because the same-origin check at
+    // https://fetch.spec.whatwg.org/#dom-request
+    // is done against <iframe>'s origin, which inherits the parent
+    // Document's origin == location.orgin. Furthermore, since the iframe
+    // inherits its parent's referrer policy, the URL should be restricted to
+    // its origin.
+    testFetchURLReferrer.step_func_done(() => {
+      assert_equals(referrer, location.origin);
+    })();
+  } else if (test_name === "testDocumentReferrer") {
+    // The referrer of the initial document in an about:blank iframe is set to
+    // its creating document's URL, unredacted by a referrer policy, as per step
+    // 13 of:
+    // https://html.spec.whatwg.org/multipage/browsers.html#creating-a-new-browsing-context.
+    testDocumentReferrer.step_func_done(() => {
+      assert_equals(referrer, location.href);
+    })();
+  } else if (test_name === "testSubresource") {
+    // Because the URL of the Document of <iframe src="about:blank"> is
+    // "about:blank", the stripped URL is no referrer:
+    // https://w3c.github.io/webappsec-referrer-policy/#strip-url.
+    testSubresource.step_func_done(() => {
+      assert_equals(referrer, "");
+    })();
+  }
+});
+
+const iframe = document.createElement("iframe");
+document.body.appendChild(iframe);
+
+const iframe_script = iframe.contentDocument.createElement('script');
+iframe_script.textContent = `
+  // Test fetch() API with default "client" referrer.
+  fetch("${location.origin}/common/security-features/subresource/xhr.py?name=testFetchClientReferrer")
+    .then(r => r.json())
+    .then(j => {
+        top.postMessage({test: "testFetchClientReferrer", referrer: j.headers.referer}, "*")
+      }).catch(e => {
+        top.postMessage({test: "testFetchClientReferrer", referrer: "FAILURE"}, "*");
+      });
+
+  // Test fetch() API with custom URL referrer.
+  fetch("${location.origin}/common/security-features/subresource/xhr.py?name=URL",
+      {referrer: "${location.href}/custom"})
+    .then(r => r.json())
+    .then(j => {
+        top.postMessage({test: "testFetchURLReferrer", referrer: j.headers.referer}, "*")
+      }).catch(e => {
+        top.postMessage({test: "testFetchURLReferrer", referrer: "FAILURE"}, "*");
+      });
+
+  // Test document.referrer.
+  top.postMessage({test: "testDocumentReferrer", referrer: document.referrer}, "*");
+
+  // Test a subresource being fetched by the iframe.
+  const subresource_script = document.createElement('script');
+  subresource_script.src = "${location.origin}/common/security-features/subresource/referrer.py";
+  subresource_script.onload = e => {
+    top.postMessage({test: "testSubresource", referrer: window.referrer}, "*");
+  }
+  subresource_script.onerror = function(e) {
+    top.postMessage({test: "testSubresource", referrer: "FAILURE"}, "*");
+  };
+  document.head.appendChild(subresource_script);
+`;
+iframe.contentDocument.body.appendChild(iframe_script);
+</script>