fix(web): escape registry and upload values in plugin manager inline handlers

The store, saved-repository and custom-registry buttons built onclick='...(${JSON.stringify(id)})...'. JSON.stringify leaves ' alone, so a custom registry entry whose id contained ' closed the attribute and added its own handler. One helper, jsStringAttr(), now HTML-escapes the JSON literal for every one of those handlers, and the store View button opens only http(s) repo links. The live window.updateImageList (plugins_manager.js loads last, so its copy wins over the file-upload widget's) wrote the uploaded file's original name, path and ids into markup raw; they are escaped now. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-10-13 02:26:37 +00:00 · 2026-09-17 08:50:09 -04:00
parent 15cc6926a4
commit 68f267143b
4 changed files with 242 additions and 15 deletions
@@ -0,0 +1,215 @@
+// Registry- and upload-supplied strings must not escape the inline handlers
+// plugins_manager.js builds for them.
+//
+// The store, saved-repository and custom-registry renderers wrote
+//
+//     <button onclick='... installFromCustomRegistry(${JSON.stringify(id)}) ...'>
+//
+// JSON.stringify makes a valid JS string but leaves `'` alone, so an entry id
+// of  x' onmouseover='alert(1)  closed the single-quoted attribute and added a
+// handler of its own. The live window.updateImageList (plugins_manager.js loads
+// last, so its copy beats the file-upload widget's) put the uploaded file's
+// original name into the markup unescaped.
+//
+// Each case renders with the shipped function, parses the tag the way a browser
+// does (quoted attribute values, entities decoded), and checks two things: no
+// attribute appeared that the template did not write, and the decoded handler
+// runs and passes the hostile value through intact as data.
+
+const fs = require('fs');
+const path = require('path');
+
+const SRC = fs.readFileSync(
+  path.resolve(__dirname, '../../../web_interface/static/v3/plugins_manager.js'), 'utf8');
+
+let pass = 0, fail = 0;
+const ok = (label, cond, extra) => cond
+  ? (pass++, console.log('  ok   ' + label))
+  : (fail++, console.log('  FAIL ' + label + (extra !== undefined ? '  -> ' + JSON.stringify(extra).slice(0, 400) : '')));
+
+function extract(opener) {
+  const start = SRC.indexOf(opener);
+  if (start < 0) { console.error('FAIL: cannot find ' + JSON.stringify(opener)); process.exit(1); }
+  let depth = 0;
+  for (let j = SRC.indexOf('{', start); j < SRC.length; j++) {
+    if (SRC[j] === '{') depth++;
+    else if (SRC[j] === '}' && --depth === 0) return SRC.slice(start, j + 1);
+  }
+  console.error('FAIL: unbalanced braces after ' + opener); process.exit(1);
+}
+
+// ── DOM shim ───────────────────────────────────────────────────────────────
+class FakeEl {
+  constructor() { this.innerHTML = ''; this.value = ''; this.textContent = ''; }
+}
+class TextEl {
+  set textContent(v) { this._t = String(v == null ? '' : v); }
+  get innerHTML() {
+    return (this._t || '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+  }
+}
+const els = {};
+global.document = {
+  getElementById: id => (els[id] ||= new FakeEl()),
+  createElement: () => new TextEl(),
+};
+global.window = global;
+global.pluginLog = () => {};
+global.isStorePluginInstalled = () => false;
+global.isNewPlugin = () => false;
+global.formatDate = () => '';
+global.setGridHtmlIfChanged = (container, html) => { container.innerHTML = html; };
+
+// eslint-disable-next-line no-eval
+eval([
+  'function escapeHtml(text) {', 'function escapeAttribute(text) {', 'function jsStringAttr(value) {',
+  'function renderPluginStore(plugins) {', 'function renderSavedRepositories(repositories) {',
+  'function renderCustomRegistryPlugins(plugins, registryUrl) {',
+].map(extract).join('\n') + '\nglobal.jsStringAttr = jsStringAttr; global.escapeHtml = escapeHtml;'
+  + '\nglobal.renderPluginStore = renderPluginStore; global.renderSavedRepositories = renderSavedRepositories;'
+  + '\nglobal.renderCustomRegistryPlugins = renderCustomRegistryPlugins; global.escapeAttribute = escapeAttribute;');
+// eslint-disable-next-line no-eval
+eval(extract('window.updateImageList = function(fieldId, images) {'));
+
+// ── minimal HTML start-tag tokenizer ───────────────────────────────────────
+function decodeEntities(s) {
+  return s.replace(/&(#x[0-9a-f]+|#\d+|quot|amp|lt|gt|apos);/gi, (m, e) => {
+    const k = e.toLowerCase();
+    if (k === 'quot') return '"';
+    if (k === 'amp') return '&';
+    if (k === 'lt') return '<';
+    if (k === 'gt') return '>';
+    if (k === 'apos') return "'";
+    return String.fromCodePoint(k[1] === 'x' ? parseInt(k.slice(2), 16) : parseInt(k.slice(1), 10));
+  });
+}
+function tags(html, name) {
+  const out = [];
+  let i = 0;
+  while ((i = html.indexOf('<' + name, i)) >= 0) {
+    let j = i + name.length + 1;
+    const attrs = [];
+    for (;;) {
+      while (/\s/.test(html[j])) j++;
+      if (html[j] === '>' || j >= html.length) break;
+      if (html[j] === '/') { j++; continue; }
+      let n = '';
+      while (j < html.length && !/[\s=>]/.test(html[j])) n += html[j++];
+      let v = '';
+      while (/\s/.test(html[j])) j++;
+      if (html[j] === '=') {
+        j++;
+        while (/\s/.test(html[j])) j++;
+        const q = html[j];
+        if (q === '"' || q === "'") {
+          const end = html.indexOf(q, j + 1);
+          v = html.slice(j + 1, end); j = end + 1;
+        } else {
+          while (j < html.length && !/[\s>]/.test(html[j])) v += html[j++];
+        }
+      }
+      attrs.push([n.toLowerCase(), decodeEntities(v)]);
+    }
+    out.push(attrs);
+    i = j;
+  }
+  return out;
+}
+const names = attrs => attrs.map(a => a[0]);
+const attr = (attrs, n) => (attrs.find(a => a[0] === n) || [])[1];
+
+// Run a decoded inline handler with window/document stubs; return the calls.
+function runHandler(code) {
+  const calls = [];
+  const win = new Proxy({}, {
+    get: (_, prop) => (...args) => { calls.push([prop, ...args]); },
+    has: () => true,
+  });
+  const doc = { getElementById: () => ({ value: '' }) };
+  // eslint-disable-next-line no-new-func
+  new Function('window', 'document', 'console', code)(win, doc, { error() {} });
+  return calls;
+}
+
+const SQ = "x' onmouseover='alert(1)";
+const DQ = 'x" onmouseover="alert(1)';
+const AMP = 'x&#39; onmouseover=&#39;alert(1)';
+
+console.log('\n1. custom registry install button');
+for (const hostile of [SQ, DQ, AMP]) {
+  renderCustomRegistryPlugins([{ id: hostile, name: 'n', plugin_path: hostile }], hostile);
+  const buttons = tags(els['custom-registry-grid'].innerHTML, 'button');
+  const b = buttons.find(a => attr(a, 'onclick'));
+  ok(`${JSON.stringify(hostile)}: only onclick and class attributes`,
+     b && names(b).join(',') === 'onclick,class', b && names(b));
+  let calls = [];
+  try { calls = runHandler(attr(b, 'onclick')); } catch (e) { calls = [['threw', String(e)]]; }
+  ok(`${JSON.stringify(hostile)}: handler passes id, url and path intact`,
+     calls.length === 1 && calls[0][0] === 'installFromCustomRegistry'
+       && calls[0][1] === hostile && calls[0][2] === hostile && calls[0][3] === hostile, calls);
+}
+
+console.log('\n2. store install and view buttons');
+for (const hostile of [SQ, DQ, AMP]) {
+  renderPluginStore([{ id: hostile, name: 'n', repo: 'https://github.com/o/r', plugin_path: 'p' }]);
+  const buttons = tags(els['plugin-store-grid'].innerHTML, 'button');
+  ok(`${JSON.stringify(hostile)}: two buttons, no extra attributes`,
+     buttons.length === 2 && buttons.every(b => names(b).every(n => ['onclick', 'class', 'disabled'].includes(n))),
+     buttons.map(names));
+  let calls = [];
+  try { calls = runHandler(attr(buttons[0], 'onclick')); } catch (e) { calls = [['threw', String(e)]]; }
+  ok(`${JSON.stringify(hostile)}: install handler gets the id intact`,
+     calls.length === 1 && calls[0][0] === 'installPlugin' && calls[0][1] === hostile, calls);
+}
+
+console.log('\n3. store view button only opens http(s) links');
+renderPluginStore([{ id: 'a', name: 'n', repo: 'https://github.com/o/r', plugin_path: 'plugins/a' }]);
+{
+  const view = tags(els['plugin-store-grid'].innerHTML, 'button')[1];
+  const calls = runHandler(attr(view, 'onclick'));
+  ok('https repo opens the plugin tree',
+     calls.length === 1 && calls[0][0] === 'open' && calls[0][1] === 'https://github.com/o/r/tree/main/plugins/a', calls);
+}
+renderPluginStore([{ id: 'a', name: 'n', repo: 'javascript:alert(document.domain)//' }]);
+{
+  const view = tags(els['plugin-store-grid'].innerHTML, 'button')[1];
+  const calls = runHandler(attr(view, 'onclick'));
+  ok('javascript: repo opens nothing', calls.length === 0, calls);
+  ok('javascript: repo button is disabled', names(view).includes('disabled'), names(view));
+}
+
+console.log('\n4. saved repository remove button');
+for (const hostile of [SQ, DQ, AMP]) {
+  renderSavedRepositories([{ url: hostile, name: hostile }]);
+  const b = tags(els['saved-repositories-list'].innerHTML, 'button')[0];
+  ok(`${JSON.stringify(hostile)}: no extra attributes`,
+     b && names(b).join(',') === 'onclick,class,title,aria-label', b && names(b));
+  let calls = [];
+  try { calls = runHandler(attr(b, 'onclick')); } catch (e) { calls = [['threw', String(e)]]; }
+  ok(`${JSON.stringify(hostile)}: handler gets the url intact`,
+     calls.length === 1 && calls[0][0] === 'removeSavedRepository' && calls[0][1] === hostile, calls);
+}
+
+console.log('\n5. live window.updateImageList escapes the uploaded file name');
+window.getUploadConfig = () => ({ plugin_id: SQ });
+window.currentPluginConfig = null;
+{
+  const name = '<img src=x onerror=alert(1)>' + DQ + '.png';
+  window.updateImageList('f', [{ id: SQ, path: 'assets/x".png', filename: DQ, original_filename: name, size: 1 }]);
+  const html = els['f_image_list'].innerHTML;
+  ok('no raw markup from original_filename', !html.includes('<img src=x onerror'), html);
+  const imgs = tags(html, 'img');
+  ok('one <img>, only the template attributes',
+     imgs.length === 1 && names(imgs[0]).join(',') === 'src,alt,loading,decoding,class,onerror', imgs.map(names));
+  ok('alt carries the stored filename as text', attr(imgs[0], 'alt') === DQ, imgs[0]);
+  const buttons = tags(html, 'button');
+  ok('two buttons, no extra attributes',
+     buttons.length === 2 && buttons.every(b => names(b).join(',') === 'type,onclick,class,title,aria-label'),
+     buttons.map(names));
+  const del = runHandler(attr(buttons[1], 'onclick'));
+  ok('delete handler gets field, image and plugin ids intact',
+     del.length === 1 && del[0][0] === 'deleteUploadedImage' && del[0][1] === 'f' && del[0][2] === SQ && del[0][3] === SQ, del);
+}
+
+console.log(`\n${pass} passed, ${fail} failed\n`);
+process.exit(fail ? 1 : 0);