Commit b1e73056 authored by ma1's avatar ma1 Committed by Pier Angelo Vendrame
Browse files

Bug 1835987 - Change RFP-spoofed TZ to Atlantic/Reykjavik. r=tjr 

Atlantic/Reykjavik stays on UTC during all the year, but it is less
likely to be blocked than plan UTC.

Differential Revision: https://phabricator.services.mozilla.com/D212131
parent 80fd1844

browser/components/resistfingerprinting/test/browser/browser_timezone.js

+12 −9
Original line number Diff line number Diff line 
/**

 * Bug 1330890 - A test case for verifying Date() object of javascript will use

 *               UTC timezone after fingerprinting resistance is enabled.

 *               Atlantic/Reykjavik timezone (GMT and "real" equivalent to UTC)

 *               after fingerprinting resistance is enabled.

 */



async function verifySpoofed() {
@@ -16,13 +17,15 @@ async function verifySpoofed() { 
  // Running in content:

  function test() {

    let date = new Date();

    const TZ_NAME = "Atlantic/Reykjavik";

    const TZ_SUFFIX = "Greenwich Mean Time";

    ok(

      date.toString().endsWith("(Coordinated Universal Time)"),

      "The date toString() is in UTC timezone."

      date.toString().endsWith(`(${TZ_SUFFIX})`),

      `The date toString() is in ${TZ_NAME} timezone.`

    );

    ok(

      date.toTimeString().endsWith("(Coordinated Universal Time)"),

      "The date toTimeString() is in UTC timezone."

      date.toTimeString().endsWith(`(${TZ_SUFFIX})`),

      `The date toTimeString() is in ${TZ_NAME} timezone.`

    );

    let dateTimeFormat = Intl.DateTimeFormat("en-US", {

      dateStyle: "full",
@@ -30,12 +33,12 @@ async function verifySpoofed() { 
    });

    is(

      dateTimeFormat.resolvedOptions().timeZone,

      "UTC",

      "The Intl.DateTimeFormat is in UTC timezone."

      TZ_NAME,

      `The Intl.DateTimeFormat is in ${TZ_NAME} timezone.`

    );

    ok(

      dateTimeFormat.format(date).endsWith("Coordinated Universal Time"),

      "The Intl.DateTimeFormat is formatting with the UTC timezone."

      dateTimeFormat.format(date).endsWith(TZ_SUFFIX),

      `The Intl.DateTimeFormat is formatting with the ${TZ_NAME} timezone.`

    );

    is(

      date.getFullYear(),

js/src/jit-test/tests/resist-fingerprinting/timezone.js

+8 −5
Original line number Diff line number Diff line
@@ -2,7 +2,10 @@ 


let tzRE = /\(([^\)]+)\)/;



// Make sure we aren't already running with UTC

const SPOOFED_TZ_NAME = "Atlantic/Reykjavik";

const SPOOFED_TZ_GENERIC = "Greenwich Mean Time";



// Make sure we aren't already running with spoofed TZ

let original = new Date(0);

assertEq(tzRE.exec(original.toString())[1], "Pacific Standard Time");
@@ -16,8 +19,8 @@ assertEq(originalDT.resolvedOptions().timeZone, "PST8PDT"); 
let global = newGlobal({shouldResistFingerprinting: true});



let date = new global.Date();

assertEq(tzRE.exec(date.toString())[1], "Coordinated Universal Time");

assertEq(tzRE.exec(date.toTimeString())[1], "Coordinated Universal Time");

assertEq(tzRE.exec(date.toString())[1], SPOOFED_TZ_GENERIC);

assertEq(tzRE.exec(date.toTimeString())[1], SPOOFED_TZ_GENERIC);

assertEq(date.getFullYear(), date.getUTCFullYear());

assertEq(date.getMonth(), date.getUTCMonth());

assertEq(date.getDate(), date.getUTCDate());
@@ -29,5 +32,5 @@ let dt = global.Intl.DateTimeFormat("en-US", { 
  dateStyle: "full",

  timeStyle: "full",

});

assertEq(dt.format(date).endsWith("Coordinated Universal Time"), true);

assertEq(dt.resolvedOptions().timeZone, "UTC");
 
assertEq(dt.format(date).endsWith(SPOOFED_TZ_GENERIC), true);

assertEq(dt.resolvedOptions().timeZone, SPOOFED_TZ_NAME);

js/src/vm/DateTime.cpp

+4 −2
Original line number Diff line number Diff line
@@ -484,10 +484,12 @@ bool js::DateTimeInfo::internalTimeZoneDisplayName(char16_t* buf, size_t buflen, 


mozilla::intl::TimeZone* js::DateTimeInfo::timeZone() {

  if (!timeZone_) {

    // For resist finger printing mode we always use the UTC time zone.

    // For resist finger printing mode we always use the Atlantic/Reykjavik time

    // zone as a "real world" UTC equivalent.

    mozilla::Maybe<mozilla::Span<const char16_t>> timeZoneOverride;

    if (shouldResistFingerprinting_) {

      timeZoneOverride = mozilla::Some(mozilla::MakeStringSpan(u"UTC"));

      timeZoneOverride =

          mozilla::Some(mozilla::MakeStringSpan(u"Atlantic/Reykjavik"));

    }



    auto timeZone = mozilla::intl::TimeZone::TryCreate(timeZoneOverride);

toolkit/components/resistfingerprinting/nsRFPService.cpp

+1 −1
Original line number Diff line number Diff line
@@ -227,7 +227,7 @@ void nsRFPService::UpdateRFPPref() { 
  }



  if (resistFingerprinting) {

    PR_SetEnv("TZ=UTC");

    PR_SetEnv("TZ=Atlantic/Reykjavik");

  } else if (sInitialized) {

    // We will not touch the TZ value if 'privacy.resistFingerprinting' is false

    // during the time of initialization.