security-and-privacy/CanvasBlocker
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added {disabled} to UNMASKED_VENDOR_WEBGL and UNMASKED_RENDERER_WEBGL

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to disabled the WEBGL_debug_renderer_info extension

Fixes #508
This commit is contained in:
kkapsner 2021-01-03 21:11:17 +01:00
parent b4a744660b
commit e2c5dfc06e
5 changed files with 48 additions and 1 deletions
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40
lib/modifiedCanvasAPI.js
View file

@ -534,6 +534,46 @@
};
}
},
getExtension: {
type: "readout",
getStatus: createGetStatus(["readout", "input"]),
object: ["WebGLRenderingContext", "WebGL2RenderingContext"],
fakeGenerator: function(checker){
return function getExtension(extensionName){
return checkerWrapper(checker, this, arguments, function(args, check){
const {prefs, notify, window, original} = check;
const originalValue = original.call(this, ...args);
if (
extensionName === "WEBGL_debug_renderer_info" &&
originalValue &&
webgl.parameterChangeDefinition[originalValue.UNMASKED_VENDOR_WEBGL] &&
webgl.parameterChangeDefinition[originalValue.UNMASKED_RENDERER_WEBGL]
){
const vendorDef = webgl.parameterChangeDefinition[originalValue.UNMASKED_VENDOR_WEBGL];
const {vendorValue, vendorFaked} = vendorDef.fake(originalValue, window, prefs);
const rendererDef = webgl.parameterChangeDefinition[originalValue.UNMASKED_RENDERER_WEBGL];
const {rendererValue, rendererFaked} = vendorDef.fake(originalValue, window, prefs);
if (
vendorFaked && vendorValue === null &&
rendererFaked && rendererValue === null
){
const value = null;
if (originalValue !== value){
notify("fakedReadout");
}
return value;
}
else {
return originalValue;
}
}
else {
return originalValue;
}
});
};
}
},
convertToBlob: {
type: "readout",
getStatus: createGetStatus("readout"),

2
lib/settingDefinitions.js
View file

@ -100,7 +100,7 @@
{message: "input", level: 2},
"fillText @ canvas", "strokeText @ canvas",
{name: "webGL", level: 2},
"readPixels @ canvas", "getParameter @ canvas",
"readPixels @ canvas", "getParameter @ canvas", "getExtension @ canvas",
{name: "Audio-API", level: 1},
"getFloatFrequencyData @ audio", "getByteFrequencyData @ audio",
"getFloatTimeDomainData @ audio", "getByteTimeDomainData @ audio",

2
lib/webgl.js
View file

@ -136,6 +136,8 @@
return false;
case "{empty}":
return "";
case "{disabled}":
return null;
}
return settingValue;
},