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Diffstat (limited to 'data/extensions/jsr@javascriptrestrictor/wrappingS-HRT.js')
| -rw-r--r-- | data/extensions/jsr@javascriptrestrictor/wrappingS-HRT.js | 81 |
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 new file mode 100644 index 0000000..066ff5b --- /dev/null +++ b/data/extensions/jsr@javascriptrestrictor/wrappingS-HRT.js @@ -0,0 +1,81 @@ +/** \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); +})(); |