Updated extensions:

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1 files changed, 122 insertions, 0 deletions

diff --git a/data/extensions/jsr@javascriptrestrictor/wrappingS-ECMA-DATE.js b/data/extensions/jsr@javascriptrestrictor/wrappingS-ECMA-DATE.js
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+/** \file
+ * \brief Wrappers for the Date object
+ *
+ *  \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 Date object.
+ *
+ * \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. [Link](https://lirias.kuleuven.be/retrieve/389086),
+ * [DOI](http://dx.doi.org/10.1145/2810103.2813632)
+ *
+ * \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: "window",
+			parent_object_property: "Date",
+			wrapped_objects: [
+				{
+					original_name: "Date",
+					wrapped_name: "originalDateConstructor",
+				},
+			],
+			helping_code: rounding_function + noise_function +
+				`
+				var precision = args[0];
+				var doNoise = args[1];
+				var func = rounding_function;
+				if (doNoise) {
+					func = noise_function;
+				}
+				`,
+			wrapping_function_args: "",
+			wrapping_function_body: `
+				var wrapped = new originalDateConstructor(...arguments);
+				if (arguments[0] === undefined) {
+					// Don't change value if custom arguments are passed
+					var changedValue = func(wrapped.getTime(), precision);
+					wrapped.setTime(changedValue);
+				}
+				return wrapped;
+				`,
+			wrapper_prototype: "originalDateConstructor",
+			post_wrapping_code: [
+				{
+					code_type: "function_define",
+					original_function: "originalDateConstructor.now",
+					parent_object: "window.Date",
+					parent_object_property: "now",
+					wrapping_function_args: "",
+					wrapping_function_body: "return func(originalF.call(Date), precision);",
+				},
+				{
+					code_type: "function_export",
+					parent_object: "window.Date",
+					parent_object_property: "parse",
+					export_function_name: "originalDateConstructor.parse",
+				},
+				{
+					code_type: "function_export",
+					parent_object: "window.Date",
+					parent_object_property: "UTC",
+					export_function_name: "originalDateConstructor.UTC",
+				},
+				{
+					code_type: "assign",
+					parent_object: "window.Date",
+					parent_object_property: "prototype",
+					value: "originalDateConstructor.prototype",
+				},
+				{
+					code_type: "assign",
+					parent_object: "window.Date.prototype",
+					parent_object_property: "constructor",
+					value: "window.Date",
+				},
+			]
+		},
+	]
+	add_wrappers(wrappers);
+})()