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Work-around for applying DOM CSP to non-HTML XML documents (thanks skriptimaahinen).

This commit is contained in:
hackademix 2020-09-04 15:05:58 +02:00
parent 52d97d29b8
commit 681d00ef84
2 changed files with 24 additions and 9 deletions
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27
src/content/DocumentCSP.js
View File

@ -25,19 +25,38 @@ class DocumentCSP {
tagName => document.createElementNS("http://www.w3.org/1999/xhtml", tagName);
let header = csp.asHeader(blocker);
let meta = createHTMLElement("meta");
meta.setAttribute("http-equiv", header.name);
meta.setAttribute("content", header.value);
let root = document.documentElement;
let {head} = document;
let parent = head || document.documentElement.appendChild(createHTMLElement("head"))
try {
if (!(document instanceof HTMLDocument)) {
// non-HTML XML documents ignore <meta> CSP unless wrapped in
// - <html><head></head></head> on Gecko
// - just <head></head> on Chromium
console.debug("XML Document: temporary replacing %o with <HTML>", root);
let htmlDoc = document.implementation.createHTMLDocument();
let htmlRoot = document.importNode(htmlDoc.documentElement, true);
document.replaceChild(htmlRoot, root);
}
let {head} = document;
let parent = head ||
document.documentElement.insertBefore(createHTMLElement("head"),
document.documentElement.firstElementChild);
parent.insertBefore(meta, parent.firstElementChild);
debug(`Failsafe <meta> CSP inserted in %s: "%s"`, document.URL, header.value);
meta.remove();
if (!head) parent.remove();
if (document.documentElement !== root)
{
document.replaceChild(root, document.documentElement);
}
} catch (e) {
error(e, "Error inserting CSP %s in %s", document.URL, header && header.value);
return false;

6
src/content/syncFetchPolicy.js
View File

@ -25,13 +25,9 @@
let {readyState} = document;
debug("Readystate: %s, suppressedScripts = %s, canScript = %s", readyState, DocumentFreezer.suppressedScripts, ns.canScript);
// CSP works on HTML documents only on Mozilla: we'll keep frozen elsewhere
let honorsCSP = document instanceof HTMLDocument;
if (!ns.canScript) {
if (honorsCSP) {
DocumentFreezer.unfreeze();
}
setTimeout(() => DocumentFreezer.unfreeze(), 0);
return;
}