Verified Commit fb25351a authored by Fatih's avatar Fatih Committed by Pier Angelo Vendrame
Browse files

Bug 1891690: Return GMT when RFPTarget::JSDateTimeUTC is enabled. r=timhuang 

Differential Revision: https://phabricator.services.mozilla.com/D216411
parent 600fa3e4

browser/components/resistfingerprinting/test/browser/browser.toml

+2 −0
Original line number Diff line number Diff line
@@ -196,3 +196,5 @@ lineno = "172" 


["browser_timezone.js"]

lineno = "176"



["browser_exslt_timezone_load.js"]

browser/components/resistfingerprinting/test/browser/browser_exslt_timezone_load.js

0 → 100644
+62 −0
Original line number Diff line number Diff line 
/**

 * Bug 1891690 - A test case for verifying EXSLT date will use Atlantic/Reykjavik

 *               timezone (GMT and "real" equivalent to UTC) after fingerprinting

 *               resistance is enabled.

 */



function getTimeZone(tab) {

  const extractTime = function () {

    const xslText = `

    <xsl:stylesheet version="1.0"

                    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

                    xmlns:date="http://exslt.org/dates-and-times"

                    extension-element-prefixes="date">

      <xsl:output method="text" />

      <xsl:template match="/">

        <xsl:value-of select="date:date-time()" />

      </xsl:template>

    </xsl:stylesheet>`;



    const parser = new DOMParser();

    const xsltProcessor = new XSLTProcessor();

    const xslStylesheet = parser.parseFromString(xslText, "application/xml");

    xsltProcessor.importStylesheet(xslStylesheet);

    const xmlDoc = parser.parseFromString("<test />", "application/xml");

    const styledDoc = xsltProcessor.transformToDocument(xmlDoc);

    const time = styledDoc.firstChild.textContent;



    return time;

  };



  const extractTimeExpr = `(${extractTime.toString()})();`;



  return SpecialPowers.spawn(

    tab.linkedBrowser,

    [extractTimeExpr],

    async funccode => content.eval(funccode)

  );

}



add_task(async function test_new_window() {

  await SpecialPowers.pushPrefEnv({

    set: [

      ["privacy.fingerprintingProtection", true],

      ["privacy.fingerprintingProtection.overrides", "+JSDateTimeUTC"],

    ],

  });



  // Open a tab for extracting the time zone from XSLT.

  const tab = await BrowserTestUtils.openNewForegroundTab({

    gBrowser,

    opening: TEST_PATH + "file_dummy.html",

    forceNewProcess: true,

  });



  SpecialPowers.Cu.getJSTestingFunctions().setTimeZone("America/Toronto");

  const timeZone = await getTimeZone(tab);



  ok(timeZone.endsWith("+00:00"), "Timezone was spoofed.");



  BrowserTestUtils.removeTab(tab);

  await SpecialPowers.popPrefEnv();

});

dom/xslt/xslt/txEXSLTFunctions.cpp

+10 −2
Original line number Diff line number Diff line
@@ -590,7 +590,15 @@ nsresult txEXSLTFunctionCall::evaluate(txIEvalContext* aContext, 
      // http://exslt.org/date/functions/date-time/



      PRExplodedTime prtime;

      PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &prtime);

      Document* sourceDoc = getSourceDocument(aContext);

      NS_ENSURE_STATE(sourceDoc);



      PR_ExplodeTime(

          PR_Now(),

          sourceDoc->ShouldResistFingerprinting(RFPTarget::JSDateTimeUTC)

              ? PR_GMTParameters

              : PR_LocalTimeParameters,

          &prtime);



      int32_t offset =

          (prtime.tm_params.tp_gmt_offset + prtime.tm_params.tp_dst_offset) /
@@ -634,7 +642,7 @@ Expr::ResultType txEXSLTFunctionCall::getReturnType() { 


bool txEXSLTFunctionCall::isSensitiveTo(ContextSensitivity aContext) {

  if (mType == txEXSLTType::NODE_SET || mType == txEXSLTType::SPLIT ||

      mType == txEXSLTType::TOKENIZE) {

      mType == txEXSLTType::TOKENIZE || mType == txEXSLTType::DATE_TIME) {

    return (aContext & PRIVATE_CONTEXT) || argsSensitiveTo(aContext);

  }

  return argsSensitiveTo(aContext);