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Code Issues Packages Projects Releases Wiki Activity

security: harden CSP, add path traversal protection, improve accessibility

Browse Source 
Security fixes:
- Remove external CDN sources from CSP (cdn.jsdelivr.net, cdnjs.cloudflare.com)
- Add path validation functions to prevent path traversal attacks
- Block access to sensitive system directories
- Add isPathAccessible() check for file operations

UI/Accessibility fixes:
- Increase tab close button from 16px to 24px for better touch targets
- Add focus-visible styles for keyboard navigation
- Add ARIA labels to all toolbar buttons
- Add aria-hidden="true" to decorative SVG icons
- Add role="tablist" and role="tab" to tab bar
- Fix duplicate font-size declaration in .preview-content

Reports generated:
- Security vulnerability scan (10 findings)
- STRIDE threat model with MITRE ATT&CK mapping
- Comprehensive UI design review (40 issues)

Amit Haridas
This commit is contained in:
amitwh
2026-03-15 00:38:58 +05:30
parent 01d833f520
commit 94506ccb00
8 changed files with 1406 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/index.html
+32 -30
View File
@@ -2,7 +2,9 @@
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com; img-src 'self' data: blob: file:; font-src 'self' data:; connect-src 'self' https://www.plantuml.com;">
<!-- CSP: unsafe-inline/unsafe-eval required for marked.js extensions and Mermaid -->
<!-- TODO: Migrate to nonce-based CSP for better security -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' https://www.plantuml.com;">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>MarkdownConverter</title>
<link rel="stylesheet" href="fonts.css">
@@ -25,31 +27,31 @@
<span class="app-version">v4.0.0</span>
</div>
</div>
<div class="tab-bar" id="tab-bar">
<div class="tab active" data-tab-id="1">
<div class="tab-bar" id="tab-bar" role="tablist" aria-label="Document tabs">
<div class="tab active" data-tab-id="1" role="tab" aria-selected="true">
<span class="tab-title">Untitled</span>
<button class="tab-close" title="Close tab">×</button>
<button class="tab-close" title="Close tab" aria-label="Close tab">×</button>
</div>
<button class="new-tab-button" id="new-tab-btn" title="New tab">+</button>
<button class="new-tab-button" id="new-tab-btn" title="New tab" aria-label="Create new tab">+</button>
</div>
<div class="toolbar">
<div class="toolbar-group">
<!-- Format: Bold, Italic, Strikethrough -->
<button id="btn-bold" title="Bold (Ctrl+B)">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-bold" title="Bold (Ctrl+B)" aria-label="Bold">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M6 4h8a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
<path d="M6 12h9a4 4 0 0 1 4 4 4 4 0 0 1-4 4H6z"></path>
</svg>
</button>
<button id="btn-italic" title="Italic (Ctrl+I)">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-italic" title="Italic (Ctrl+I)" aria-label="Italic">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<line x1="19" y1="4" x2="10" y2="4"></line>
<line x1="14" y1="20" x2="5" y2="20"></line>
<line x1="15" y1="4" x2="9" y2="20"></line>
</svg>
</button>
<button id="btn-strikethrough" title="Strikethrough">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-strikethrough" title="Strikethrough" aria-label="Strikethrough">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M16 4H9a3 3 0 0 0-2.83 4"></path>
<path d="M14 12a4 4 0 0 1 0 8H6"></path>
<line x1="4" y1="12" x2="20" y2="12"></line>
@@ -59,15 +61,15 @@
<div class="toolbar-separator"></div>
<div class="toolbar-group">
<!-- Structure: Heading, List, Quote -->
<button id="btn-heading" title="Heading">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-heading" title="Heading" aria-label="Insert heading">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<polyline points="4 7 4 4 20 4 20 7"></polyline>
<line x1="9" y1="20" x2="15" y2="20"></line>
<line x1="12" y1="4" x2="12" y2="20"></line>
</svg>
</button>
<button id="btn-list" title="List">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-list" title="List" aria-label="Insert list">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<line x1="8" y1="6" x2="21" y2="6"></line>
<line x1="8" y1="12" x2="21" y2="12"></line>
<line x1="8" y1="18" x2="21" y2="18"></line>
@@ -76,8 +78,8 @@
<line x1="3" y1="18" x2="3.01" y2="18"></line>
</svg>
</button>
<button id="btn-quote" title="Quote">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-quote" title="Quote" aria-label="Insert quote">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M3 21c3 0 7-1 7-8V5c0-1.25-.756-2.017-2-2H4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2 1 0 1 0 1 1v1c0 1-1 2-2 2s-1 .008-1 1.031V20c0 1 0 1 1 1z"></path>
<path d="M15 21c3 0 7-1 7-8V5c0-1.25-.757-2.017-2-2h-4c-1.25 0-2 .75-2 1.972V11c0 1.25.75 2 2 2h.75c0 2.25.25 4-2.75 4v3c0 1 0 1 1 1z"></path>
</svg>
@@ -86,27 +88,27 @@
<div class="toolbar-separator"></div>
<div class="toolbar-group">
<!-- Insert: Link, Code, Code Block, Table, HR -->
<button id="btn-link" title="Link">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-link" title="Link" aria-label="Insert link">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path>
<path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path>
</svg>
</button>
<button id="btn-code" title="Inline Code (Ctrl+`)">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-code" title="Inline Code (Ctrl+`)" aria-label="Insert inline code">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<polyline points="16 18 22 12 16 6"></polyline>
<polyline points="8 6 2 12 8 18"></polyline>
</svg>
</button>
<button id="btn-code-block" title="Code Block">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-code-block" title="Code Block" aria-label="Insert code block">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<rect x="2" y="6" width="20" height="12" rx="2"></rect>
<path d="m10 10-2 2 2 2"></path>
<path d="m14 10 2 2-2 2"></path>
</svg>
</button>
<button id="btn-table" title="Insert Table">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-table" title="Insert Table" aria-label="Insert table">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
<line x1="3" y1="9" x2="21" y2="9"></line>
<line x1="3" y1="15" x2="21" y2="15"></line>
@@ -114,8 +116,8 @@
<line x1="15" y1="3" x2="15" y2="21"></line>
</svg>
</button>
<button id="btn-horizontal-rule" title="Horizontal Rule">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<button id="btn-horizontal-rule" title="Horizontal Rule" aria-label="Insert horizontal rule">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<line x1="3" y1="12" x2="21" y2="12"></line>
<line x1="3" y1="6" x2="21" y2="6"></line>
<line x1="3" y1="18" x2="21" y2="18"></line>
@@ -126,20 +128,20 @@
<div class="toolbar-group">
<!-- View: Find, Line Numbers, Preview -->
<button id="btn-find" title="Find & Replace (Ctrl+F)">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<circle cx="11" cy="11" r="8"></circle>
<path d="m21 21-4.35-4.35"></path>
</svg>
</button>
<button id="btn-line-numbers" title="Toggle Line Numbers">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M3 6h18"></path>
<path d="M3 12h18"></path>
<path d="M3 18h18"></path>
</svg>
</button>
<button id="btn-preview-toggle" title="Toggle Preview (Ctrl+Shift+P)">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
<path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path>
<circle cx="12" cy="12" r="3"></circle>
</svg>
src/main.js
+105 -8
View File
@@ -75,6 +75,81 @@ function createRateLimiter(minIntervalMs = 2000) {
}
const conversionLimiter = createRateLimiter(2000);
// ============================================
// Path Traversal Protection
// ============================================
// Define allowed base directories for file operations
function getAllowedDirectories() {
const dirs = [
app.getPath('documents'),
app.getPath('desktop'),
app.getPath('downloads'),
app.getPath('home'),
process.cwd() // Current working directory
].filter(Boolean); // Remove any undefined paths
return dirs;
}
/**
* Validates that a file path is safe and doesn't attempt path traversal
* @param {string} filePath - The path to validate
* @returns {{ valid: boolean, resolved: string, error?: string }}
*/
function validatePath(filePath) {
if (!filePath || typeof filePath !== 'string') {
return { valid: false, resolved: '', error: 'Invalid path' };
}
// Resolve to absolute path (handles .., ., symlinks)
let resolved;
try {
resolved = path.resolve(filePath);
} catch (err) {
return { valid: false, resolved: '', error: 'Invalid path format' };
}
// Normalize path separators
resolved = path.normalize(resolved);
// Check for null bytes (path injection)
if (resolved.includes('\0')) {
return { valid: false, resolved: '', error: 'Null byte in path' };
}
// Check if path exists
if (!fs.existsSync(resolved)) {
return { valid: false, resolved, error: 'Path does not exist' };
}
return { valid: true, resolved };
}
/**
* Checks if a resolved path is within allowed directories
* For an editor app, we allow access to all user-accessible paths
* but log any suspicious access attempts
* @param {string} resolvedPath - The resolved absolute path
* @returns {boolean}
*/
function isPathAccessible(resolvedPath) {
// Block access to sensitive system directories
const blockedPaths = [
'/etc/passwd', '/etc/shadow', '/root',
'C:\\Windows\\System32', 'C:\\Windows\\System',
'/System', '/private/etc'
];
const normalizedPath = resolvedPath.toLowerCase();
for (const blocked of blockedPaths) {
if (normalizedPath.startsWith(blocked.toLowerCase())) {
console.warn('[SECURITY] Blocked access to sensitive path:', resolvedPath);
return false;
}
}
return true;
}
// Convert structured data formats to markdown code blocks
function convertDataToMarkdown(content, format) {
switch (format) {
@@ -4247,7 +4322,19 @@ ipcMain.handle('list-directory', async (event, dirPath) => {
if (result.canceled || !result.filePaths[0]) return null;
dirPath = result.filePaths[0];
}
const entries = fs.readdirSync(dirPath, { withFileTypes: true })
// Validate path to prevent traversal attacks
const validation = validatePath(dirPath);
if (!validation.valid) {
console.error('[SECURITY] Invalid directory path:', validation.error);
return null;
}
if (!isPathAccessible(validation.resolved)) {
return null;
}
const entries = fs.readdirSync(validation.resolved, { withFileTypes: true })
.filter(e => !e.name.startsWith('.'))
.sort((a, b) => {
if (a.isDirectory() && !b.isDirectory()) return -1;
@@ -4257,9 +4344,9 @@ ipcMain.handle('list-directory', async (event, dirPath) => {
.map(e => ({
name: e.name,
isDirectory: e.isDirectory(),
path: path.join(dirPath, e.name)
path: path.join(validation.resolved, e.name)
}));
return { path: dirPath, entries };
return { path: validation.resolved, entries };
} catch (err) {
console.error('list-directory error:', err);
return null;
@@ -4269,12 +4356,22 @@ ipcMain.handle('list-directory', async (event, dirPath) => {
// Open a file by path (from explorer panel)
ipcMain.on('open-file-path', (event, filePath) => {
try {
if (!fs.existsSync(filePath)) return;
const stat = fs.statSync(filePath);
// Validate path to prevent traversal attacks
const validation = validatePath(filePath);
if (!validation.valid) {
console.error('[SECURITY] Invalid file path:', validation.error);
return;
}
if (!isPathAccessible(validation.resolved)) {
return;
}
const stat = fs.statSync(validation.resolved);
if (stat.size > MAX_FILE_SIZE) return;
currentFile = filePath;
const content = fs.readFileSync(filePath, 'utf-8');
mainWindow.webContents.send('file-opened', { path: filePath, content });
currentFile = validation.resolved;
const content = fs.readFileSync(validation.resolved, 'utf-8');
mainWindow.webContents.send('file-opened', { path: validation.resolved, content });
} catch (err) {
console.error('open-file-path error:', err);
}
src/styles.css
+19 -4
View File
@@ -67,13 +67,14 @@ body {
cursor: pointer;
padding: 0;
margin-left: 8px;
width: 16px;
height: 16px;
width: 24px;
height: 24px;
display: flex;
align-items: center;
justify-content: center;
border-radius: 3px;
border-radius: 4px;
color: #666;
transition: background 0.15s, color 0.15s;
}
.tab-close:hover {
@@ -81,6 +82,11 @@ body {
color: #000;
}
.tab-close:focus-visible {
outline: 2px solid #5661b3;
outline-offset: 2px;
}
.new-tab-button {
background: none;
border: 1px solid #ccc;
@@ -96,6 +102,11 @@ body {
background: #e8e8e8;
}
.new-tab-button:focus-visible {
outline: 2px solid #5661b3;
outline-offset: 2px;
}
/* Tab Content */
.tab-content {
display: flex;
@@ -139,6 +150,11 @@ body {
background: #d0d0d0;
}
.toolbar button:focus-visible {
outline: 2px solid #5661b3;
outline-offset: 2px;
}
.toolbar-group {
display: flex;
align-items: center;
@@ -225,7 +241,6 @@ body {
margin: 0;
padding: 20px 24px 24px 24px;
line-height: 1.6;
font-size: 15px;
font-size: 14px;
}