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/*******************************************************************************
ηMatrix - a browser extension to black/white list requests.
Copyright (C) 2017-2019 Raymond Hill
Copyright (C) 2019-2022 Alessio Vanni
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 {http://www.gnu.org/licenses/}.
Home: https://gitlab.com/vannilla/ematrix
uMatrix Home: https://github.com/gorhill/uMatrix
*/
'use strict';
// Injected into content pages
(function () {
if (typeof vAPI !== 'object') {
return;
}
vAPI.selfWorkerSrcReported = vAPI.selfWorkerSrcReported || false;
var reGoodWorkerSrc = /(?:frame|worker)-src[^;,]+?'none'/;
var handler = function(ev) {
if (ev.isTrusted !== true
|| ev.originalPolicy.includes('report-uri about:blank') === false) {
return false;
}
// Firefox and Chromium differs in how they fill the
// 'effectiveDirective' property.
// ηMatrix: what does Pale Moon/Basilisk do?
if (ev.effectiveDirective.startsWith('worker-src') === false
&& ev.effectiveDirective.startsWith('frame-src') === false) {
return false;
}
// Further validate that the policy violation is relevant to ηMatrix:
// the event still could have been fired as a result of a CSP header
// not injected by ηMatrix.
if (reGoodWorkerSrc.test(ev.originalPolicy) === false) {
return false;
}
// We do not want to report internal resources more than once.
// However, we do want to report external resources each time.
// TODO: this could eventually lead to duplicated reports for external
// resources if another extension uses the same approach as
// ηMatrix. Think about what could be done to avoid duplicate
// reports.
if (ev.blockedURI.includes('://') === false) {
if (vAPI.selfWorkerSrcReported) {
return true;
}
vAPI.selfWorkerSrcReported = true;
}
vAPI.messaging.send('contentscript.js', {
what: 'securityPolicyViolation',
directive: 'worker-src',
blockedURI: ev.blockedURI,
documentURI: ev.documentURI,
blocked: ev.disposition === 'enforce'
});
return true;
};
document.addEventListener('securitypolicyviolation', function (ev) {
if (!handler(ev)) {
return;
}
ev.stopPropagation();
ev.preventDefault();
}, true);
})();
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