[tor-commits] [Git][tpo/applications/mullvad-browser][mullvad-browser-115.4.0esr-13.5-1] fixup! Bug 42019: Empty browser's clipboard on browser shutdown

richard pushed to branch mullvad-browser-115.4.0esr-13.5-1 at The Tor Project / Applications / Mullvad Browser

Commits:

68ee3400

by hackademix at 2023-10-18T21:27:57+00:00

fixup! Bug 42019: Empty browser's clipboard on browser shutdown

Bug 42154: empty clipboard content from private windows on exit.

Changes:

browser/app/profile/001-base-profile.js

@@ -87,6 +87,9 @@ pref("browser.sessionstore.resume_from_crash", false);
  // Also not needed in PBM at the moment.
  pref("browser.pagethumbnails.capturing_disabled", true);
 +// Empty clipboard content from private windows on exit (tor-browser#42154)
 +pref("browser.privatebrowsing.preserveClipboard", false);
++
  // Enable HTTPS-Only mode (tor-browser#19850)
  pref("dom.security.https_only_mode", true);
  // The previous pref automatically sets this to true (see StaticPrefList.yaml),

browser/components/BrowserGlue.sys.mjs

@@ -148,6 +148,119 @@ const PRIVATE_BROWSING_EXE_ICON_INDEX = 1;
  const PREF_PRIVATE_BROWSING_SHORTCUT_CREATED =
    "browser.privacySegmentation.createdShortcut";
 +// Empty clipboard content from private windows on exit
 +// (tor-browser#42154)
 +const ClipboardPrivacy = {
 +  _lastClipboardHash: null,
 +  _globalActivation: false,
 +  _isPrivateClipboard: false,
 +  _hasher: null,
++
 +  _computeClipboardHash(win = Services.ww.activeWindow) {
 +    const trans = Cc["@mozilla.org/widget/transferable;1"].createInstance(
 +      Ci.nsITransferable
 +    );
 +    trans.init(win?.docShell?.QueryInterface(Ci.nsILoadContext) || null);
 +    ["text/x-moz-url", "text/plain"].forEach(trans.addDataFlavor);
 +    try {
 +      Services.clipboard.getData(trans, Ci.nsIClipboard.kGlobalClipboard);
 +      const clipboardContent = {};
 +      trans.getAnyTransferData({}, clipboardContent);
 +      const { data } = clipboardContent.value.QueryInterface(
 +        Ci.nsISupportsString
 +      );
 +      const bytes = new TextEncoder().encode(data);
 +      const hasher = (this._hasher ||= Cc[
 +        "@mozilla.org/security/hash;1"
 +      ].createInstance(Ci.nsICryptoHash));
 +      hasher.init(hasher.SHA256);
 +      hasher.update(bytes, bytes.length);
 +      return hasher.finish(true);
 +    } catch (e) {}
 +    return null;
 +  },
++
 +  startup() {
 +    this._lastClipboardHash = this._computeClipboardHash();
++
 +    // Here we track changes in active window / application,
 +    // by filtering focus events and window closures.
 +    const handleActivation = (win, activation) => {
 +      if (activation) {
 +        if (!this._globalActivation) {
 +          // focus changed within this window, bail out.
 +          return;
 +        }
 +        this._globalActivation = false;
 +      } else if (!Services.focus.activeWindow) {
 +        // focus is leaving this window:
 +        // let's track whether it remains within the browser.
 +        lazy.setTimeout(() => {
 +          this._globalActivation = !Services.focus.activeWindow;
 +        }, 100);
 +      }
 +      const clipboardHash = this._computeClipboardHash(win);
 +      if (clipboardHash !== this._lastClipboardHash) {
 +        this._isPrivateClipboard =
 +          !activation &&
 +          (lazy.PrivateBrowsingUtils.permanentPrivateBrowsing ||
 +            lazy.PrivateBrowsingUtils.isWindowPrivate(win));
 +        this._lastClipboardHash = clipboardHash;
 +        console.log(
 +          `Clipboard changed: private ${this._isPrivateClipboard}, hash ${clipboardHash}.`
 +        );
 +      }
 +    };
 +    const focusListener = e =>
 +      e.isTrusted && handleActivation(e.currentTarget, e.type === "focusin");
 +    const initWindow = win => {
 +      for (const e of ["focusin", "focusout"]) {
 +        win.addEventListener(e, focusListener);
 +      }
 +    };
 +    for (const w of Services.ww.getWindowEnumerator()) {
 +      initWindow(w);
 +    }
 +    Services.ww.registerNotification((win, event) => {
 +      switch (event) {
 +        case "domwindowopened":
 +          initWindow(win);
 +          break;
 +        case "domwindowclosed":
 +          handleActivation(win, false);
 +          if (
 +            this._isPrivateClipboard &&
 +            lazy.PrivateBrowsingUtils.isWindowPrivate(win) &&
 +            !(
 +              lazy.PrivateBrowsingUtils.permanentPrivateBrowsing ||
 +              Array.from(Services.ww.getWindowEnumerator()).find(w =>
 +                lazy.PrivateBrowsingUtils.isWindowPrivate(w)
 +              )
 +            )
 +          ) {
 +            // no more private windows, empty private content if needed
 +            this.emptyPrivate();
 +          }
 +      }
 +    });
 +  },
 +  emptyPrivate() {
 +    if (
 +      this._isPrivateClipboard &&
 +      !Services.prefs.getBoolPref(
 +        "browser.privatebrowsing.preserveClipboard",
 +        false
 +      ) &&
 +      this._lastClipboardHash === this._computeClipboardHash()
 +    ) {
 +      Services.clipboard.emptyClipboard(Ci.nsIClipboard.kGlobalClipboard);
 +      this._lastClipboardHash = null;
 +      this._isPrivateClipboard = false;
 +      console.log("Private clipboard emptied.");
 +    }
 +  },
 +};
++
  /**
   * Fission-compatible JSProcess implementations.
   * Each actor options object takes the form of a ProcessActorOptions dictionary.
@@ -1619,6 +1732,8 @@ BrowserGlue.prototype = {
      lazy.DoHController.init();
 +    ClipboardPrivacy.startup();
++
      this._firstWindowTelemetry(aWindow);
      this._firstWindowLoaded();
@@ -1879,7 +1994,7 @@ BrowserGlue.prototype = {
            lazy.UpdateListener.reset();
+         }
        },
 -      () => Services.clipboard.emptyClipboard(Ci.nsIClipboard.kGlobalClipboard), // tor-browser#42019
 +      () => ClipboardPrivacy.emptyPrivate(), // tor-browser#42019
      ];
      for (let task of tasks) {