123 lines
3.8 KiB
JavaScript
123 lines
3.8 KiB
JavaScript
// Copyright 2018-2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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const path = require('path');
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const fs = require('fs');
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function _eliminateAllAfterCharacter(string, character) {
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const index = string.indexOf(character);
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if (index < 0) {
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return string;
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}
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return string.slice(0, index);
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}
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function _urlToPath(targetUrl, options = {}) {
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const { isWindows } = options;
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const decoded = decodeURIComponent(targetUrl);
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const withoutScheme = decoded.slice(isWindows ? 8 : 7);
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const withoutQuerystring = _eliminateAllAfterCharacter(withoutScheme, '?');
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const withoutHash = _eliminateAllAfterCharacter(withoutQuerystring, '#');
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return withoutHash;
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}
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function _createFileHandler({ userDataPath, installPath, isWindows }) {
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return (request, callback) => {
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let targetPath;
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try {
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targetPath = _urlToPath(request.url, { isWindows });
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} catch (err) {
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const errorMessage =
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err && typeof err.message === 'string'
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? err.message
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: 'no error message';
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console.log(
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`Warning: denying request because of an error: ${errorMessage}`
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);
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// This is an "invalid URL" error. See [Chromium's net error list][0].
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//
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// [0]: https://source.chromium.org/chromium/chromium/src/+/master:net/base/net_error_list.h;l=563;drc=a836ee9868cf1b9673fce362a82c98aba3e195de
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return callback({ error: -300 });
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}
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// normalize() is primarily useful here for switching / to \ on windows
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const target = path.normalize(targetPath);
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// here we attempt to follow symlinks to the ultimate final path, reflective of what
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// we do in main.js on userDataPath and installPath
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const realPath = fs.existsSync(target) ? fs.realpathSync(target) : target;
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// finally we do case-insensitive checks on windows
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const properCasing = isWindows ? realPath.toLowerCase() : realPath;
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if (!path.isAbsolute(realPath)) {
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console.log(
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`Warning: denying request to non-absolute path '${realPath}'`
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);
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return callback();
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}
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if (
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!properCasing.startsWith(
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isWindows ? userDataPath.toLowerCase() : userDataPath
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) &&
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!properCasing.startsWith(
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isWindows ? installPath.toLowerCase() : installPath
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)
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) {
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console.log(
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`Warning: denying request to path '${realPath}' (userDataPath: '${userDataPath}', installPath: '${installPath}')`
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);
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return callback();
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}
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return callback({
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path: realPath,
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});
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};
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}
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function installFileHandler({
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protocol,
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userDataPath,
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installPath,
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isWindows,
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}) {
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protocol.interceptFileProtocol(
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'file',
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_createFileHandler({ userDataPath, installPath, isWindows })
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);
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}
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// Turn off browser URI scheme since we do all network requests via Node.js
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function _disabledHandler(request, callback) {
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return callback();
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}
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function installWebHandler({ protocol, enableHttp }) {
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protocol.interceptFileProtocol('about', _disabledHandler);
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protocol.interceptFileProtocol('content', _disabledHandler);
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protocol.interceptFileProtocol('chrome', _disabledHandler);
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protocol.interceptFileProtocol('cid', _disabledHandler);
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protocol.interceptFileProtocol('data', _disabledHandler);
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protocol.interceptFileProtocol('filesystem', _disabledHandler);
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protocol.interceptFileProtocol('ftp', _disabledHandler);
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protocol.interceptFileProtocol('gopher', _disabledHandler);
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protocol.interceptFileProtocol('javascript', _disabledHandler);
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protocol.interceptFileProtocol('mailto', _disabledHandler);
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if (!enableHttp) {
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protocol.interceptFileProtocol('http', _disabledHandler);
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protocol.interceptFileProtocol('https', _disabledHandler);
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protocol.interceptFileProtocol('ws', _disabledHandler);
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protocol.interceptFileProtocol('wss', _disabledHandler);
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}
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}
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module.exports = {
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_urlToPath,
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installFileHandler,
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installWebHandler,
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};
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