Updated extensions:

 * Upgraded Privacy Redirect to 1.1.49 and configured to use the 10 most reliable invidious instances
 * Removed ViewTube
 * Added torproxy@icecat.gnu based on 'Proxy toggle' extension
 * Added jShelter 0.11.1
 * Upgraded LibreJS to 7.21.0
 * Upgraded HTTPS Everywhere to 2021.7.13
 * Upgraded SubmitMe to 1.9

1 files changed, 81 insertions, 0 deletions

diff --git a/data/extensions/jsr@javascriptrestrictor/wrappingS-HRT.js b/data/extensions/jsr@javascriptrestrictor/wrappingS-HRT.js
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+/** \file
+ * \brief Wrappers for High Resolution Time (Level 2) standard
+ *
+ * \see https://w3c.github.io/hr-time/
+ *
+ *  \author Copyright (C) 2019  Libor Polcak
+ *  \author Copyright (C) 2020  Peter Hornak
+ *
+ *  \license SPDX-License-Identifier: GPL-3.0-or-later
+ */
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+
+/** \file
+ * \ingroup wrappers
+ *
+ * This wrapper aims on prevention of microarchitectural attacks, clock-skew attacks, and other time
+ * related attacks. The goal is to limit the precision of the time returned by the Performance API.
+ *
+ * \see https://www.fit.vut.cz/study/thesis/22308/?year=0&sup=Pol%C4%8D%C3%A1k, especially Sect.
+ * 7.2.
+ *
+ * \see Tom Van Goethem, Wouter Joosen, Nick Nikiforakis. The Clock is Still Ticking:
+Timing Attacks in the Modern Web. CCS'15. DOI: http://dx.doi.org/10.1145/2810103.2813632.
+https://lirias.kuleuven.be/retrieve/389086
+ *
+ * \see Schwarz, M., Lipp, M. a Gruss, D. JavaScript Zero: Real JavaScript and Zero
+ *      Side-Channel Attacks. NDSS'18.
+ *
+ * \see Schwarz M., Maurice C., Gruss D., Mangard S. (2017) Fantastic Timers and Where to Find Them: High-Resolution Microarchitectural Attacks in JavaScript. In: Kiayias A. (eds) Financial Cryptography and Data Security. FC 2017. Lecture Notes in Computer Science, vol 10322. Springer, Cham. https://doi.org/10.1007/978-3-319-70972-7_13 
+ *
+ * The wrappers support the following behaviour:
+ *
+ * * Round timestamp: Limit the precision by removing (a part of) the decimal part of the timestamp.
+ * * Randomize after rounding: Create a fake decimal part to confuse attackers and to create
+ *   timestamps that look similar to expected timestamps.
+ */
+
+
+
+/*
+ * Create private namespace
+ */
+(function() {
+	var wrappers = [
+		{
+			parent_object: "Performance.prototype",
+			parent_object_property: "now",
+			wrapped_objects: [
+				{
+					original_name: "Performance.prototype.now",
+					wrapped_name: "origNow",
+				}
+			],
+			helping_code: rounding_function + noise_function + `
+				let precision = args[0];
+				let doNoise = args[1];
+			`,
+			wrapping_function_args: "",
+			wrapping_function_body: `
+					var originalPerformanceValue = origNow.call(window.performance);
+					var limit_precision = doNoise ? noise_function : rounding_function;
+					return limit_precision(originalPerformanceValue, precision);
+			`,
+		},
+	];
+	add_wrappers(wrappers);
+})();