Commits:
-
5c690113
by Pier Angelo Vendrame at 2024-04-08T12:51:54+02:00
fixup! Firefox preference overrides.
Bug 41676: Set privacy.resistFingerprinting.testing.setTZtoUTC as a
defense-in-depth.
We will have to revert this during the ESR-transition.
-
d1e8e6ba
by Pier Angelo Vendrame at 2024-04-08T12:51:55+02:00
Bug 42428: Make RFP spoof the timezone of document.lastModified.
-
a975b00f
by Pier Angelo Vendrame at 2024-04-08T12:51:56+02:00
Bug 42472: Spoof timezone in XSLT.
3 changed files:
Changes:
browser/app/profile/001-base-profile.js
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@@ -397,6 +397,9 @@ pref("browser.display.use_system_colors", false); |
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397
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397
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// Enforce non-native widget theme (true by default, defense in depth).
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398
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398
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// Provides a uniform look and feel across platforms. Added with tor-browser#41496.
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399
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399
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pref("widget.non-native-theme.enabled", true);
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400
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+// tor-browser#41676: Set the TZ environment variable as a defense-in-depth.
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401
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+// TODO: Remove this in ESR-128, as it has been removed in 116 with Bug 1837582.
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402
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+pref("privacy.resistFingerprinting.testing.setTZtoUTC", true);
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400
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403
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401
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404
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// tor-browser#41943: lock and revisit after it gets flipped to true in stable Firefox
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402
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405
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pref("_javascript_.options.spectre.disable_for_isolated_content", false, locked);
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dom/base/Document.cpp
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@@ -4103,10 +4103,11 @@ void Document::SetDocumentURI(nsIURI* aURI) { |
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4103
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4103
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}
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4104
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4104
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}
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4105
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4105
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4106
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-static void GetFormattedTimeString(PRTime aTime,
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4106
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+static void GetFormattedTimeString(PRTime aTime, bool aUniversal,
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4107
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4107
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nsAString& aFormattedTimeString) {
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4108
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4108
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PRExplodedTime prtime;
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4109
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- PR_ExplodeTime(aTime, PR_LocalTimeParameters, &prtime);
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4109
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+ PR_ExplodeTime(aTime, aUniversal ? PR_GMTParameters : PR_LocalTimeParameters,
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4110
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+ &prtime);
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4110
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4111
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// "MM/DD/YYYY hh:mm:ss"
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4111
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4112
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char formatedTime[24];
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4112
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4113
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if (SprintfLiteral(formatedTime, "%02d/%02d/%04d %02d:%02d:%02d",
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@@ -4124,7 +4125,9 @@ void Document::GetLastModified(nsAString& aLastModified) const { |
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4124
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4125
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if (!mLastModified.IsEmpty()) {
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4125
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4126
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aLastModified.Assign(mLastModified);
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4126
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4127
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} else {
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4127
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- GetFormattedTimeString(PR_Now(), aLastModified);
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4128
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+ GetFormattedTimeString(PR_Now(),
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4129
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+ ShouldResistFingerprinting(RFPTarget::Unknown),
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4130
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+ aLastModified);
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4128
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4131
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}
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4129
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4132
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}
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4130
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4133
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@@ -11053,7 +11056,8 @@ void Document::RetrieveRelevantHeaders(nsIChannel* aChannel) { |
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11053
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11056
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11054
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11057
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mLastModified.Truncate();
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11055
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11058
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if (modDate != 0) {
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11056
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- GetFormattedTimeString(modDate, mLastModified);
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11059
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+ GetFormattedTimeString(
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11060
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+ modDate, ShouldResistFingerprinting(RFPTarget::Unknown), mLastModified);
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11057
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11061
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}
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11058
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11062
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}
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11059
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11063
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dom/xslt/xslt/txEXSLTFunctions.cpp
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@@ -591,7 +591,14 @@ nsresult txEXSLTFunctionCall::evaluate(txIEvalContext* aContext, |
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591
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591
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// http://exslt.org/date/functions/date-time/
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592
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592
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593
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593
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PRExplodedTime prtime;
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594
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- PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &prtime);
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594
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+ PR_ExplodeTime(
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595
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+ PR_Now(),
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596
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+ // We are not allowed to access the Document when evaluating this, so
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597
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+ // fall back to the general function.
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598
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+ nsContentUtils::ShouldResistFingerprinting(RFPTarget::Unknown)
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599
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+ ? PR_GMTParameters
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600
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+ : PR_LocalTimeParameters,
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601
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+ &prtime);
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595
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602
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596
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603
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int32_t offset =
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597
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604
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(prtime.tm_params.tp_gmt_offset + prtime.tm_params.tp_dst_offset) /
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